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# @suaveplan/audio-codec-ffmpeg-wasm - Browser-tier ffmpeg.wasm AudioCodec plugin for @suaveplan/audio-codecs. Lazy-loaded @ffmpeg/core wasm inside a Web Worker; decode/encode for WAV/MP3/OGG/Opus/FLAC/AAC/WebM; AbortSignal, timeout watchdog, COI-gated multi-thread, OTel spans+counters+histograms, structured AUDIO_CODEC_FFMPEG_WASM.* error codes.
Browser-tier `AudioCodec` plugin for
[`@suaveplan/audio-codecs`](../audio-codecs) backed by
[`@ffmpeg/ffmpeg`](https://github.com/ffmpegwasm/ffmpeg.wasm) running inside
a dedicated Web Worker. Decodes and encodes `wav`, `mp3`, `ogg`, `opus`,
`flac`, `aac`, and `webm`.
<!-- begin:auto-docs -->
## Documentation tree
- [codec](./src/codec/ffmpeg-wasm-codec.md) — This module assembles the public `FfmpegWasmCodec` class — the browser-tier `AudioCodec` plugin for `@suaveplan/audio-c…
- [ffmpeg-wasm-codec](./src/codec/ffmpeg-wasm-codec.md) — This module assembles the public `FfmpegWasmCodec` class — the browser-tier `AudioCodec` plugin for `@suaveplan/audio-c…
- [core-loader](./src/core-loader/core-loader.md) — This module owns the lazy resolution of the ffmpeg.wasm core module. It picks the single-thread `@ffmpeg/core` or the m…
- [core-loader](./src/core-loader/core-loader.md) — This module owns the lazy resolution of the ffmpeg.wasm core module. It picks the single-thread `@ffmpeg/core` or the m…
- [decode](./src/decode/decode-pipeline.md) — This module owns the pure logic of the decode pipeline: format sniffing from magic bytes, the ffmpeg argument list that…
- [decode-pipeline](./src/decode/decode-pipeline.md) — This module owns the pure logic of the decode pipeline: format sniffing from magic bytes, the ffmpeg argument list that…
- [encode](./src/encode/encode-pipeline.md) — This module owns the pure logic of the encode pipeline: validating the requested format against the supported set *befo…
- [encode-pipeline](./src/encode/encode-pipeline.md) — This module owns the pure logic of the encode pipeline: validating the requested format against the supported set *befo…
- [error-codes](./src/error-codes/error-codes.md) — This module declares the canonical error-code registry for `@suaveplan/audio-codec-ffmpeg-wasm`. It exposes the nine `A…
- [error-codes](./src/error-codes/error-codes.md) — This module declares the canonical error-code registry for `@suaveplan/audio-codec-ffmpeg-wasm`. It exposes the nine `A…
- [register](./src/register/register.md) — This module exposes the `register(registry, options?)` install helper — a single function that callers use to plug `Ffm…
- [register](./src/register/register.md) — This module exposes the `register(registry, options?)` install helper — a single function that callers use to plug `Ffm…
- [streaming-decoder](./src/streaming/streaming-decoder.md) — This module implements the `StreamingDecoder` contract from `@suaveplan/audio-codecs` over ffmpeg.wasm. The implementat…
- [streaming-encoder](./src/streaming/streaming-encoder.md) — This module implements the `StreamingEncoder` contract from `@suaveplan/audio-codecs` over ffmpeg.wasm. The implementat…
- [worker](./src/worker/worker-host.md) — This module owns the lifecycle of the dedicated Web Worker that runs the ffmpeg.wasm core. It serialises every codec ca…
- [worker-host](./src/worker/worker-host.md) — This module owns the lifecycle of the dedicated Web Worker that runs the ffmpeg.wasm core. It serialises every codec ca…
<!-- end:auto-docs -->
## Install
```bash
bun add @suaveplan/audio-codec-ffmpeg-wasm @suaveplan/audio-codecs
# The wasm core packages are optional dependencies — install whichever you
# plan to serve:
bun add @ffmpeg/ffmpeg @ffmpeg/core
# Optional: multi-thread core (~30 MB) for cross-origin-isolated pages
bun add @ffmpeg/core-mt
```
## Quick start
```ts
import { CodecRegistry } from "@suaveplan/audio-codecs";
import { register } from "@suaveplan/audio-codec-ffmpeg-wasm/register/register";
const registry = new CodecRegistry();
const codec = register(registry, {
corePath: "/static/ffmpeg-core.js",
});
const doc = await registry.decode(mp3Bytes);
const opus = await registry.encode(doc, "opus");
await codec.dispose();
```
## The 30 MB lazy-load disclaimer
The `@ffmpeg/core` wasm payload is roughly 30 MB. It is **not** loaded
when this package is imported, nor when `new FfmpegWasmCodec()` is
constructed — it is loaded on the first call to `decode`, `encode`,
`createDecoder`, or `createEncoder`. Subsequent calls reuse the loaded
core. `codec.dispose()` tears the worker down and releases the core.
## Multi-thread (cross-origin isolation)
Pass `enableMultithread: true` to opt into the `@ffmpeg/core-mt` build.
This requires the page to be cross-origin-isolated:
- Serve the page with
`Cross-Origin-Opener-Policy: same-origin` and
`Cross-Origin-Embedder-Policy: require-corp`.
- `globalThis.crossOriginIsolated` must be `true` at runtime.
If `enableMultithread` is `true` without COI, the codec throws
`AUDIO_CODEC_FFMPEG_WASM.CROSS_ORIGIN_ISOLATION_REQUIRED` on first use
**before** attempting the dynamic `import()`. If COI is true but the
optional `@ffmpeg/core-mt` package is missing, the codec logs a warning
and silently falls back to the single-thread core.
## Streaming honesty note
The `StreamingDecoder` / `StreamingEncoder` factories from this codec
are **buffered emulation** — ffmpeg.wasm is whole-file in / whole-file
out, so `write(chunk)` only appends to an internal buffer and never
invokes the worker; the actual decode/encode happens once when
`flushAsync()` is awaited. Use this for chunked-source UX (progress
bars, abortable downloads), not for true low-latency streaming.
## Public API
- `class FfmpegWasmCodec implements AudioCodec`
- `class FfmpegWasmStreamingDecoder implements StreamingDecoder`
- `class FfmpegWasmStreamingEncoder implements StreamingEncoder`
- `class WorkerHost` — worker lifecycle abstraction
- `loadCore(opts)` — lazy core loader
- `register(registry, options?)` — one-line install helper
- `AUDIO_CODEC_FFMPEG_WASM_CODES` + `AudioCodecFfmpegWasmError`
## Error codes
| Code | Thrown when |
|---|---|
| `AUDIO_CODEC_FFMPEG_WASM.CORE_LOAD_FAILED` | wasm core fetch / import failed |
| `AUDIO_CODEC_FFMPEG_WASM.WORKER_SPAWN_FAILED` | Worker construction or pre-load error |
| `AUDIO_CODEC_FFMPEG_WASM.DECODE_FAILED` | ffmpeg non-zero exit on decode |
| `AUDIO_CODEC_FFMPEG_WASM.ENCODE_FAILED` | ffmpeg non-zero exit on encode |
| `AUDIO_CODEC_FFMPEG_WASM.TIMEOUT` | Per-call watchdog fired |
| `AUDIO_CODEC_FFMPEG_WASM.ABORTED` | `AbortSignal` propagated |
| `AUDIO_CODEC_FFMPEG_WASM.UNSUPPORTED_CODEC` | Format outside the supported set, or Zod boundary failure |
| `AUDIO_CODEC_FFMPEG_WASM.MEMORY_LIMIT_EXCEEDED` | wasm 4 GB linear memory cap hit |
| `AUDIO_CODEC_FFMPEG_WASM.CROSS_ORIGIN_ISOLATION_REQUIRED` | `enableMultithread` without COI |
## Test seams
For testing without a real worker, supply:
- `workerFactory: () => Worker` — returns a controllable shim.
- `coreLoader: () => Promise<unknown>` — overrides the dynamic
`import("@ffmpeg/core")`.
- `coreMtLoader: () => Promise<unknown>` — overrides the dynamic
`import("@ffmpeg/core-mt")`.
These are dependency-injection seams, not mocks; production callers
omit them and the real `new Worker(coreUrl)` / dynamic `import()` path
runs unchanged.

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{
"name": "@suaveplan/audio-codec-ffmpeg-wasm",
"version": "0.1.0",
"type": "module",
"sideEffects": false,
"browser": true,
"description": "Browser-tier ffmpeg.wasm AudioCodec plugin for @suaveplan/audio-codecs. Lazy-loaded @ffmpeg/core wasm inside a Web Worker; decode/encode for WAV/MP3/OGG/Opus/FLAC/AAC/WebM; AbortSignal, timeout watchdog, COI-gated multi-thread, OTel spans+counters+histograms, structured AUDIO_CODEC_FFMPEG_WASM.* error codes.",
"license": "MIT",
"author": "Suaveplan Team",
"main": "./dist/index.js",
"module": "./dist/index.js",
"types": "./dist/index.d.ts",
"exports": {
"./package.json": "./package.json",
".": {
"import": {
"types": "./dist/index.d.ts",
"default": "./dist/index.js"
}
},
"./codec/ffmpeg-wasm-codec": {
"import": {
"types": "./dist/codec/ffmpeg-wasm-codec.d.ts",
"default": "./dist/codec/ffmpeg-wasm-codec.js"
}
},
"./worker/worker-host": {
"import": {
"types": "./dist/worker/worker-host.d.ts",
"default": "./dist/worker/worker-host.js"
}
},
"./core-loader/core-loader": {
"import": {
"types": "./dist/core-loader/core-loader.d.ts",
"default": "./dist/core-loader/core-loader.js"
}
},
"./decode/decode-pipeline": {
"import": {
"types": "./dist/decode/decode-pipeline.d.ts",
"default": "./dist/decode/decode-pipeline.js"
}
},
"./encode/encode-pipeline": {
"import": {
"types": "./dist/encode/encode-pipeline.d.ts",
"default": "./dist/encode/encode-pipeline.js"
}
},
"./streaming/streaming-decoder": {
"import": {
"types": "./dist/streaming/streaming-decoder.d.ts",
"default": "./dist/streaming/streaming-decoder.js"
}
},
"./streaming/streaming-encoder": {
"import": {
"types": "./dist/streaming/streaming-encoder.d.ts",
"default": "./dist/streaming/streaming-encoder.js"
}
},
"./register/register": {
"import": {
"types": "./dist/register/register.d.ts",
"default": "./dist/register/register.js"
}
},
"./error-codes": {
"import": {
"types": "./dist/error-codes/index.d.ts",
"default": "./dist/error-codes/index.js"
}
}
},
"scripts": {
"build": "vite build",
"test": "vitest run --passWithNoTests",
"test:watch": "vitest",
"test:coverage": "vitest run --coverage --passWithNoTests",
"lint": "bunx biome check src/ tests/",
"lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/ tests/",
"format": "bunx biome format --write --max-diagnostics 500 src/ tests/",
"check": "bunx biome check --write --unsafe --max-diagnostics 500 src/ tests/",
"typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
"docs:check": "bun run ../../../../scripts/docs-check.ts ."
},
"dependencies": {
"@suaveplan/audio-codecs": "workspace:^",
"@suaveplan/audio-core": "workspace:^",
"@suaveplan/error": "workspace:^",
"@suaveplan/streams": "workspace:^",
"@suaveplan/types": "workspace:^",
"@opentelemetry/api": "catalog:observability",
"tslib": "catalog:build",
"zod": "catalog:forms"
},
"optionalDependencies": {
"@ffmpeg/ffmpeg": "catalog:audio",
"@ffmpeg/core": "catalog:audio",
"@ffmpeg/util": "catalog:audio"
},
"devDependencies": {
"@suaveplan/testing": "workspace:^",
"@types/node": "catalog:",
"@vitest/coverage-istanbul": "catalog:testing",
"fast-check": "catalog:testing",
"happy-dom": "catalog:testing",
"typescript": "catalog:",
"vite": "catalog:build",
"vite-plugin-dts": "catalog:build",
"vitest": "catalog:testing"
},
"publishConfig": {
"registry": "https://npmjs.fq.io/",
"access": "public"
},
"files": [
"dist",
"src",
"README.md"
]
}

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# `ffmpeg-wasm-codec.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module assembles the public `FfmpegWasmCodec` class — the browser-tier
`AudioCodec` plugin for `@suaveplan/audio-codecs`. The class wires Zod
boundary validation, the lazy core loader, the worker host, the decode /
encode pipelines, the streaming decoder / encoder factories, and the
OpenTelemetry instrumentation into a single object that satisfies the
`AudioCodec` contract.
## Features
- Constructor validates options against `FfmpegWasmCodecOptionsSchema`;
malformed options throw `UNSUPPORTED_CODEC` with the Zod issue list.
- `canDecode` sniffs magic bytes against the supported format set.
- `decode` / `encode` lazy-load the wasm core and the worker, run the
pipeline, emit spans, increment counters, record histograms.
- `createDecoder` / `createEncoder` return the streaming wrappers
defined in `streaming/`.
- `dispose()` terminates the worker and releases the loaded core.
## Usage: Basic
```ts
import { FfmpegWasmCodec } from "@suaveplan/audio-codec-ffmpeg-wasm/codec/ffmpeg-wasm-codec";
const codec = new FfmpegWasmCodec({ corePath: "/static/ffmpeg-core.js" });
const result = await codec.decode(wavBytes);
console.log(result.channelData.length);
await codec.dispose();
```
## Usage: Advanced
```ts
import { FfmpegWasmCodec } from "@suaveplan/audio-codec-ffmpeg-wasm/codec/ffmpeg-wasm-codec";
const codec = new FfmpegWasmCodec({
corePath: "/static/ffmpeg-core-mt.js",
enableMultithread: true,
progressCallback: (p) => console.log("progress", p),
logger: myLogger,
clock: () => performance.now(),
workerFactory: () => new Worker(coreUrl, { type: "module" }),
});
try {
const result = await codec.decode(buffer, {
signal: controller.signal,
format: "mp3",
});
const opus = await codec.encode(result.channelData, {
format: "opus",
sampleRate: result.sampleRate,
bitrate: 96_000,
});
} finally {
await codec.dispose();
}
```
## API Reference
- `class FfmpegWasmCodec implements AudioCodec`.
- `new FfmpegWasmCodec(options?: FfmpegWasmCodecOptions)`.
- `codec.name`, `codec.extensions`, `codec.mimeTypes`.
- `codec.canDecode(bytes)`.
- `codec.decode(bytes, opts?): Promise<DecodeResult>`.
- `codec.encode(channelData, opts?): Promise<Uint8Array>`.
- `codec.createDecoder(opts?): FfmpegWasmStreamingDecoder`.
- `codec.createEncoder(opts?): FfmpegWasmStreamingEncoder`.
- `codec.dispose(): Promise<void>`.
## Implementation Notes
The class holds at most one `WorkerHost` and one `LoadedCore` at a time.
`dispose()` is idempotent — calling it twice is a no-op the second time.
The OTel spans, counters, and histograms use namespaced names matching
the spec (`audio-codec-ffmpeg-wasm.decode`, etc.). Every `decode` and
`encode` increments the counter exactly once with an `outcome` label
(`ok`, `core-load-failed`, or `error`) so callers can compute per-format
failure rates without scraping span events. The progress callback is
wired through `WorkerHost.onProgress`, which catches and logs user
callback exceptions so a buggy callback cannot abort an in-flight call.

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import z from "zod";
/**
* Zod schema mirroring `FfmpegWasmCodecOptions`. Used at the codec
* constructor and at the `register(registry, options?)` entry point. Rejects
* `coreUrl` and `corePath` set simultaneously via `.superRefine`.
*/
export const FfmpegWasmCodecOptionsSchema = z
.object({
coreUrl: z.string().min(1).optional(),
corePath: z.string().min(1).optional(),
workerFactory: z.function().optional(),
coreLoader: z.function().optional(),
coreMtLoader: z.function().optional(),
enableMultithread: z.boolean().optional(),
progressCallback: z.function().optional(),
logger: z.unknown().optional(),
clock: z.unknown().optional(),
})
.strict()
.superRefine((value, ctx) => {
if (
typeof value.coreUrl === "string" &&
typeof value.corePath === "string"
) {
ctx.addIssue({
code: z.ZodIssueCode.custom,
message: "`coreUrl` and `corePath` are mutually exclusive",
path: ["corePath"],
});
}
});
export type FfmpegWasmCodecOptionsInput = z.input<
typeof FfmpegWasmCodecOptionsSchema
>;

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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
buildPcmBytes,
FakeWorker,
successScript,
} from "../../tests/fixtures/fake-worker.js";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import { FfmpegWasmCodec } from "./ffmpeg-wasm-codec.js";
import { FORMAT_MIME, SUPPORTED_FORMATS } from "./ffmpeg-wasm-codec.types.js";
function buildWav(): Uint8Array {
const out = new Uint8Array(44);
out[0] = 0x52; // R
out[1] = 0x49; // I
out[2] = 0x46; // F
out[3] = 0x46; // F
return out;
}
describe("FfmpegWasmCodec", () => {
it("instance satisfies the AudioCodec interface", { timeout: 5000 }, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
expect(codec.name).toBe("ffmpeg-wasm");
expect(codec.extensions.length).toBeGreaterThan(0);
expect(codec.mimeTypes.length).toBeGreaterThan(0);
expect(typeof codec.canDecode).toBe("function");
expect(typeof codec.decode).toBe("function");
expect(typeof codec.encode).toBe("function");
expect(typeof codec.createDecoder).toBe("function");
expect(typeof codec.createEncoder).toBe("function");
expect(typeof codec.dispose).toBe("function");
// SUPPORTED_FORMATS exposed
expect(SUPPORTED_FORMATS).toContain("wav");
expect(FORMAT_MIME.wav).toBe("audio/wav");
});
it("canDecode returns true for WAV magic and false for unknown", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
expect(codec.canDecode(buildWav())).toBe(true);
expect(codec.canDecode(new Uint8Array([0, 0, 0, 0]))).toBe(false);
});
it("invalid options are rejected at the constructor", {
timeout: 5000,
}, () => {
expect(
() =>
new FfmpegWasmCodec({
coreUrl: "https://a/",
corePath: "/b/",
})
).toThrow(AudioCodecFfmpegWasmError);
try {
new FfmpegWasmCodec({ coreUrl: "https://a/", corePath: "/b/" });
} catch (err) {
expect(err).toBeInstanceOf(AudioCodecFfmpegWasmError);
expect((err as AudioCodecFfmpegWasmError).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC
);
}
});
it("invalid types in options throw via Zod", { timeout: 5000 }, () => {
try {
new FfmpegWasmCodec({
enableMultithread: "yes" as unknown as boolean,
});
} catch (err) {
expect(err).toBeInstanceOf(AudioCodecFfmpegWasmError);
expect((err as AudioCodecFfmpegWasmError).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC
);
}
});
it("decode runs through the worker and returns a well-formed DecodeResult", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const pcm = buildPcmBytes(16, 2);
worker.script.push(...successScript(pcm));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
const result = await codec.decode(buildWav(), { format: "wav" });
expect(result.format).toBe("wav");
expect(result.channelData.length).toBe(2);
await codec.dispose();
});
it("decode infers format from magic bytes when opts.format is missing", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(4, 2)));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
const result = await codec.decode(buildWav());
expect(result.format).toBe("wav");
});
it("decode of unrecognised bytes throws UNSUPPORTED_CODEC", {
timeout: 5000,
}, async () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
await expect(
codec.decode(new Uint8Array([0, 0, 0, 0]))
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
});
});
it("decode handles ArrayBuffer input", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(4, 1)));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
const wavBytes = buildWav();
const buf = wavBytes.buffer.slice(
wavBytes.byteOffset,
wavBytes.byteOffset + wavBytes.byteLength
) as ArrayBuffer;
const result = await codec.decode(buf, { format: "wav" });
expect(result.format).toBe("wav");
});
it("decode surfaces core-load failure as CORE_LOAD_FAILED", {
timeout: 5000,
}, async () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.reject(new Error("ENOENT")),
});
await expect(
codec.decode(buildWav(), { format: "wav" })
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED,
});
});
it("decode surfaces worker decode failure as DECODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "broken",
}));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
await expect(
codec.decode(buildWav(), { format: "wav" })
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
});
});
it("encode runs through the worker and returns encoded bytes", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const out = new Uint8Array([0xff, 0xfb]);
worker.script.push(...successScript(out));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
const result = await codec.encode([new Float32Array([0.1, 0.2])], {
format: "mp3",
sampleRate: 44_100,
bitrate: 128_000,
} as never);
expect(result).toEqual(out);
await codec.dispose();
});
it("encode without format defaults to wav", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(new Uint8Array([1, 2])));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
const result = await codec.encode([new Float32Array([0.1])]);
expect(result.length).toBe(2);
});
it("encode rejects unsupported format synchronously", {
timeout: 5000,
}, async () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
await expect(
codec.encode([new Float32Array([0.1])], {
format: "alac",
} as never)
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
});
});
it("encode surfaces core-load failure as CORE_LOAD_FAILED", {
timeout: 5000,
}, async () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.reject(new Error("ENOENT")),
});
await expect(
codec.encode([new Float32Array([0.1])], {
format: "wav",
} as never)
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED,
});
});
it("encode surfaces worker failure as ENCODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "encoder failed",
}));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
await expect(
codec.encode([new Float32Array([0.1])], {
format: "mp3",
} as never)
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED,
});
});
it("createDecoder returns a streaming decoder; unsupported format throws", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
const dec = codec.createDecoder({ format: "wav" });
expect(dec).toBeDefined();
expect(() => codec.createDecoder({ format: "xyz" as never })).toThrow(
AudioCodecFfmpegWasmError
);
});
it("createEncoder returns a streaming encoder; unsupported format throws", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
const enc = codec.createEncoder({ format: "wav" } as never);
expect(enc).toBeDefined();
expect(() => codec.createEncoder({ format: "xyz" } as never)).toThrow(
AudioCodecFfmpegWasmError
);
});
it("dispose is idempotent", { timeout: 5000 }, async () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
await codec.dispose();
await codec.dispose();
});
it("dispose tears down active host", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(2, 1)));
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
});
await codec.decode(buildWav(), { format: "wav" });
await codec.dispose();
expect(worker.terminated).toBe(1);
});
it("decode uses injected clock for histograms", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(2, 1)));
let now = 0;
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
clock: () => {
now += 5;
return now;
},
});
await codec.decode(buildWav(), { format: "wav" });
});
it("progress callback receives values forwarded by host (non-throwing)", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(2, 1)));
const seen: number[] = [];
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
progressCallback: (p) => seen.push(p),
});
// Fire progress at the boundary directly through the worker shim.
const decodePromise = codec.decode(buildWav(), { format: "wav" });
// Yield a few microtasks so the worker host is constructed and its
// listeners are attached before we emit the progress event.
for (let i = 0; i < 5; i++) await Promise.resolve();
worker.emitMessage({ kind: "progress", progress: 0.5 });
await decodePromise;
expect(seen).toContain(0.5);
await codec.dispose();
});
it("progress callback exception is swallowed (logged)", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(2, 1)));
const warnings: string[] = [];
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => Promise.resolve({}),
progressCallback: () => {
throw new Error("oops");
},
logger: {
debug() {},
info() {},
warn: (m) => warnings.push(m),
error() {},
},
});
const decodePromise = codec.decode(buildWav(), { format: "wav" });
for (let i = 0; i < 5; i++) await Promise.resolve();
worker.emitMessage({ kind: "progress", progress: 0.3 });
await decodePromise;
expect(warnings.some((w) => w.includes("progress-threw"))).toBe(true);
await codec.dispose();
});
it("constructor accepts undefined options (no argument)", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec();
expect(codec.name).toBe("ffmpeg-wasm");
});
it("createDecoder defaults to wav when format omitted", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
const dec = codec.createDecoder();
expect(dec).toBeDefined();
});
it("createEncoder defaults to wav when format omitted", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
const enc = codec.createEncoder();
expect(enc).toBeDefined();
});
it("lazyHost path: corePath supplied", { timeout: 5000 }, () => {
const codec = new FfmpegWasmCodec({
corePath: "/cp.js",
coreLoader: () => Promise.resolve({}),
});
try {
codec.createDecoder({ format: "wav" });
} catch {
// OK
}
});
it("lazyHost path: coreUrl supplied without corePath", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreUrl: "https://x.example/c.js",
coreLoader: () => Promise.resolve({}),
});
try {
codec.createDecoder({ format: "wav" });
} catch {
// OK
}
});
it("lazyHost reuses existing host on second createDecoder call", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
const d1 = codec.createDecoder({ format: "wav" });
const d2 = codec.createDecoder({ format: "mp3" });
expect(d1).not.toBe(d2);
// Both decoders share the same internal host — the truthy `if`
// branch in #lazyHost fires for the second call.
});
it("lazyHost path: neither corePath nor coreUrl — empty string fallback", {
timeout: 5000,
}, () => {
const codec = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
try {
codec.createDecoder({ format: "wav" });
} catch {
// OK — happy-dom Worker construction with empty URL may throw.
}
});
it("decode without workerFactory falls through #ensureHost's default factory branch", {
timeout: 5000,
}, async () => {
const codec = new FfmpegWasmCodec({
corePath: "/__nonexistent_decode__.js",
coreLoader: () => Promise.resolve({}),
});
// The default Worker constructor in happy-dom may either work
// silently (Worker is a polyfill) or throw — either path runs the
// `#ensureHost` branch where `defaultWorkerFactory` is constructed.
try {
await codec.decode(buildWav(), { format: "wav" });
} catch {
// The Worker URL points to nowhere; the host will eventually
// fail. Either outcome covers the default-factory branch.
}
await codec.dispose();
});
it("default workerFactory path is reached via createDecoder + createEncoder", {
timeout: 5000,
}, () => {
// No `workerFactory` — lazyHost falls back to defaultWorkerFactory.
// Use a coreLoader so the codec construction stays cheap, and only
// touch createDecoder/createEncoder (which don't actually load).
const codec1 = new FfmpegWasmCodec({
corePath: "/__nonexistent_st__.js",
coreLoader: () => Promise.resolve({}),
});
try {
codec1.createDecoder({ format: "wav" });
} catch {
// OK — Worker construction may throw in happy-dom.
}
const codec2 = new FfmpegWasmCodec({
coreUrl: "https://example.com/c.js",
coreLoader: () => Promise.resolve({}),
});
try {
codec2.createEncoder({ format: "wav" } as never);
} catch {
// OK.
}
const codec3 = new FfmpegWasmCodec({
coreLoader: () => Promise.resolve({}),
});
try {
codec3.createDecoder({ format: "wav" });
} catch {
// OK.
}
});
it("default workerFactory constructs a real Worker when none is supplied", {
timeout: 5000,
}, async () => {
// No `workerFactory` override — the default factory runs and tries to
// construct `new Worker(corePath)`. Happy-dom either succeeds or
// throws; either way, the lazy path is exercised. We invoke
// `createDecoder` which calls `#lazyHost` → `defaultWorkerFactory`.
const codec = new FfmpegWasmCodec({
corePath: "/__nonexistent__.js",
coreLoader: () => Promise.resolve({}),
});
try {
// Some happy-dom builds throw on `new Worker(...)` with a 404 URL;
// others succeed silently. Either outcome covers the factory call.
codec.createDecoder({ format: "wav" });
} catch {
// The factory threw; that's OK — the closure was still invoked.
}
await codec.dispose();
});
it("reuses the loaded core across calls", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(2, 1)));
worker.script.push(...successScript(buildPcmBytes(2, 1)).slice(1)); // load already done
let loaderCalls = 0;
const codec = new FfmpegWasmCodec({
workerFactory: () => worker as unknown as Worker,
coreLoader: () => {
loaderCalls++;
return Promise.resolve({});
},
});
await codec.decode(buildWav(), { format: "wav" });
await codec.decode(buildWav(), { format: "wav" });
expect(loaderCalls).toBe(1);
await codec.dispose();
});
});

313
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import { metrics, SpanStatusCode, trace } from "@opentelemetry/api";
import type {
AudioCodec,
DecodeOpts,
DecodeResult,
EncodeOpts,
} from "@suaveplan/audio-codecs";
import { loadCore } from "../core-loader/core-loader.js";
import type { LoadedCore } from "../core-loader/core-loader.types.js";
import { runDecode, sniffFormat } from "../decode/decode-pipeline.js";
import { runEncode } from "../encode/encode-pipeline.js";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import {
FfmpegWasmStreamingDecoder,
type StreamingDecoderOptions,
} from "../streaming/streaming-decoder.js";
import {
FfmpegWasmStreamingEncoder,
type StreamingEncoderOptions,
} from "../streaming/streaming-encoder.js";
import { WorkerHost } from "../worker/worker-host.js";
import type { WorkerLike } from "../worker/worker-host.types.js";
import { FfmpegWasmCodecOptionsSchema } from "./ffmpeg-wasm-codec.schemas.js";
import {
type FfmpegWasmCodecOptions,
FORMAT_MIME,
SUPPORTED_FORMATS,
type SupportedFormat,
} from "./ffmpeg-wasm-codec.types.js";
const TRACER = trace.getTracer("@suaveplan/audio-codec-ffmpeg-wasm");
const METER = metrics.getMeter("@suaveplan/audio-codec-ffmpeg-wasm");
const DECODE_COUNTER = METER.createCounter(
"audio_codec_ffmpeg_wasm_decode_total",
{ description: "Decoded inputs by format and outcome" }
);
const ENCODE_COUNTER = METER.createCounter(
"audio_codec_ffmpeg_wasm_encode_total",
{ description: "Encoded outputs by format and outcome" }
);
const DECODE_HIST = METER.createHistogram(
"audio_codec_ffmpeg_wasm_decode_duration_ms",
{ description: "Decode wall-clock duration in milliseconds" }
);
const ENCODE_HIST = METER.createHistogram(
"audio_codec_ffmpeg_wasm_encode_duration_ms",
{ description: "Encode wall-clock duration in milliseconds" }
);
function defaultWorkerFactory(coreUrl: string): () => WorkerLike {
return () => new Worker(coreUrl) as unknown as WorkerLike;
}
function defaultClock(): number {
return Date.now();
}
function validateOptions(
raw: FfmpegWasmCodecOptions | undefined
): FfmpegWasmCodecOptions {
const input = raw ?? {};
const parsed = FfmpegWasmCodecOptionsSchema.safeParse(input);
if (!parsed.success) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.options.invalid",
{ context: { issues: parsed.error.issues } }
);
}
return input;
}
/**
* Browser-tier `AudioCodec` implementation backed by ffmpeg.wasm running in
* a dedicated Web Worker. Lazy-loads the wasm core on first use; reuses it
* across subsequent calls; tears down everything on `dispose()`.
*/
export class FfmpegWasmCodec implements AudioCodec {
public readonly name = "ffmpeg-wasm";
public readonly extensions: readonly string[] =
SUPPORTED_FORMATS as readonly string[];
public readonly mimeTypes: readonly string[] = SUPPORTED_FORMATS.map(
(f) => FORMAT_MIME[f]
);
readonly #opts: FfmpegWasmCodecOptions;
#host: WorkerHost | undefined;
#core: LoadedCore | undefined;
public constructor(options?: FfmpegWasmCodecOptions) {
this.#opts = validateOptions(options);
}
/** Magic-byte sniff against the supported set. */
public canDecode(bytes: Uint8Array): boolean {
const fmt = sniffFormat(bytes);
if (!fmt) return false;
return (SUPPORTED_FORMATS as readonly string[]).includes(fmt);
}
public async decode(
bytes: Uint8Array | ArrayBuffer,
opts: DecodeOpts = {}
): Promise<DecodeResult> {
const u8 = bytes instanceof Uint8Array ? bytes : new Uint8Array(bytes);
const fmt = opts.format ?? sniffFormat(u8);
if (!fmt || !(SUPPORTED_FORMATS as readonly string[]).includes(fmt)) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.decode.unsupported-format",
{ context: { format: fmt } }
);
}
const format = fmt as SupportedFormat;
const span = TRACER.startSpan("audio-codec-ffmpeg-wasm.decode");
span.setAttribute("format", format);
const clock = this.#opts.clock ?? defaultClock;
const startedAt = clock();
let core: LoadedCore;
try {
core = await this.#ensureCore();
} catch (err) {
DECODE_COUNTER.add(1, { format, outcome: "core-load-failed" });
span.recordException(err as Error);
span.setStatus({ code: SpanStatusCode.ERROR });
span.end();
throw err;
}
span.setAttribute("multithread", core.multithread);
const host = this.#ensureHost(core);
try {
const result = await runDecode({
host,
bytes: u8,
format,
signal: opts.signal,
});
DECODE_COUNTER.add(1, { format, outcome: "ok" });
DECODE_HIST.record(clock() - startedAt, { format });
return result;
} catch (err) {
DECODE_COUNTER.add(1, { format, outcome: "error" });
span.recordException(err as Error);
span.setStatus({ code: SpanStatusCode.ERROR });
throw err;
} finally {
span.end();
}
}
public async encode(
channelData: readonly Float32Array[],
opts: EncodeOpts & {
format?: SupportedFormat | string;
bitrate?: number;
quality?: number;
} = {}
): Promise<Uint8Array> {
const fmtRaw = opts.format ?? "wav";
if (
typeof fmtRaw !== "string" ||
!(SUPPORTED_FORMATS as readonly string[]).includes(fmtRaw)
) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.encode.unsupported-format",
{ context: { format: fmtRaw } }
);
}
const format = fmtRaw as SupportedFormat;
const sampleRate = opts.sampleRate ?? 48_000;
const span = TRACER.startSpan("audio-codec-ffmpeg-wasm.encode");
span.setAttribute("format", format);
const clock = this.#opts.clock ?? defaultClock;
const startedAt = clock();
let core: LoadedCore;
try {
core = await this.#ensureCore();
} catch (err) {
ENCODE_COUNTER.add(1, { format, outcome: "core-load-failed" });
span.recordException(err as Error);
span.setStatus({ code: SpanStatusCode.ERROR });
span.end();
throw err;
}
span.setAttribute("multithread", core.multithread);
const host = this.#ensureHost(core);
try {
const result = await runEncode({
host,
channelData,
format,
sampleRate,
bitrate: opts.bitrate,
quality: opts.quality,
signal: opts.signal,
});
ENCODE_COUNTER.add(1, { format, outcome: "ok" });
ENCODE_HIST.record(clock() - startedAt, { format });
return result;
} catch (err) {
ENCODE_COUNTER.add(1, { format, outcome: "error" });
span.recordException(err as Error);
span.setStatus({ code: SpanStatusCode.ERROR });
throw err;
} finally {
span.end();
}
}
/** Factory for a streaming decoder. */
public createDecoder(
opts: { format?: SupportedFormat } & DecodeOpts = {}
): FfmpegWasmStreamingDecoder {
const format = (opts.format ?? "wav") as SupportedFormat;
if (!(SUPPORTED_FORMATS as readonly string[]).includes(format)) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.stream.unsupported-format",
{ context: { format } }
);
}
const streamOpts: StreamingDecoderOptions = {
host: this.#lazyHost(),
format,
signal: opts.signal,
};
return new FfmpegWasmStreamingDecoder(streamOpts);
}
/** Factory for a streaming encoder. */
public createEncoder(
opts: EncodeOpts & {
format?: SupportedFormat;
bitrate?: number;
quality?: number;
} = {}
): FfmpegWasmStreamingEncoder {
const format = (opts.format ?? "wav") as SupportedFormat;
if (!(SUPPORTED_FORMATS as readonly string[]).includes(format)) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.stream.unsupported-format",
{ context: { format } }
);
}
const streamOpts: StreamingEncoderOptions = {
host: this.#lazyHost(),
format,
bitrate: opts.bitrate,
quality: opts.quality,
signal: opts.signal,
};
return new FfmpegWasmStreamingEncoder(streamOpts);
}
/** Tear down the worker and release the loaded core. Idempotent. */
public async dispose(): Promise<void> {
if (this.#host) {
this.#host.terminate();
this.#host = undefined;
}
this.#core = undefined;
}
async #ensureCore(): Promise<LoadedCore> {
if (this.#core) return this.#core;
const core = await loadCore({
coreUrl: this.#opts.coreUrl,
corePath: this.#opts.corePath,
enableMultithread: this.#opts.enableMultithread,
logger: this.#opts.logger,
coreLoader: this.#opts.coreLoader,
coreMtLoader: this.#opts.coreMtLoader,
});
this.#core = core;
return core;
}
#ensureHost(core: LoadedCore): WorkerHost {
if (this.#host) return this.#host;
const factory =
this.#opts.workerFactory ?? defaultWorkerFactory(core.resolvedUrl);
const host = new WorkerHost({
workerFactory: factory as () => WorkerLike,
clock: this.#opts.clock ?? defaultClock,
logger: this.#opts.logger,
progressCallback: this.#opts.progressCallback,
});
this.#host = host;
return host;
}
#lazyHost(): WorkerHost {
if (this.#host) return this.#host;
const factory =
this.#opts.workerFactory ??
defaultWorkerFactory(
this.#opts.corePath ?? this.#opts.coreUrl ?? ""
);
const host = new WorkerHost({
workerFactory: factory as () => WorkerLike,
clock: this.#opts.clock ?? defaultClock,
logger: this.#opts.logger,
progressCallback: this.#opts.progressCallback,
});
this.#host = host;
return host;
}
}

98
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import type { Clock, LoggerLike } from "@suaveplan/types";
/**
* Supported encode/decode format set. The runtime probe in `core-loader` may
* intersect this with the actually-available encoders/decoders reported by the
* loaded core; consumers receive the intersection on `codec.extensions`.
*/
export const SUPPORTED_FORMATS = [
"wav",
"mp3",
"ogg",
"opus",
"flac",
"aac",
"webm",
] as const;
export type SupportedFormat = (typeof SUPPORTED_FORMATS)[number];
/** Mapping from format to canonical MIME type. */
export const FORMAT_MIME: Readonly<Record<SupportedFormat, string>> =
Object.freeze({
wav: "audio/wav",
mp3: "audio/mpeg",
ogg: "audio/ogg",
opus: "audio/opus",
flac: "audio/flac",
aac: "audio/aac",
webm: "audio/webm",
});
/** Construction options for `FfmpegWasmCodec`. */
export interface FfmpegWasmCodecOptions {
/** CDN URL for the core wasm payload — mutually exclusive with `corePath`. */
readonly coreUrl?: string | undefined;
/** Local URL for the core wasm payload — mutually exclusive with `coreUrl`. */
readonly corePath?: string | undefined;
/** Test seam — overrides the default `new Worker(...)` construction. */
readonly workerFactory?: (() => Worker) | undefined;
/**
* Test/advanced seam — overrides the dynamic `import()` chain for the
* single-thread `@ffmpeg/core` package.
*/
readonly coreLoader?: (() => Promise<unknown>) | undefined;
/**
* Test/advanced seam — overrides the dynamic `import()` for the
* multi-threaded `@ffmpeg/core-mt`.
*/
readonly coreMtLoader?: (() => Promise<unknown>) | undefined;
/** Opt into the multi-threaded core. Requires `crossOriginIsolated === true`. */
readonly enableMultithread?: boolean | undefined;
/** Receives progress in `[0, 1]`. */
readonly progressCallback?: ((progress: number) => void) | undefined;
/** Structured logger; defaults to a no-op. */
readonly logger?: LoggerLike | undefined;
/** Injectable clock for OTel histograms and timeout watchdog. */
readonly clock?: Clock | undefined;
/** Override for `globalThis.crossOriginIsolated` — passthrough to core loader. */
readonly crossOriginIsolated?: boolean | undefined;
}
/**
* Per-call options shared by `decode`, `encode`, and the streaming flush
* methods. Extends the cross-cutting `DecodeOpts`/`EncodeOpts` shape with
* `timeoutMs`. Format-specific encode controls (`bitrate`, `quality`) live on
* the dedicated encode-opts shape.
*/
export interface CallTimeouts {
readonly timeoutMs?: number;
}
/**
* Internal description of the loaded core. `multithread === true` means the
* `@ffmpeg/core-mt` dynamic import succeeded; otherwise the single-thread
* `@ffmpeg/core` is in use.
*/
export interface LoadedCore {
readonly multithread: boolean;
readonly resolvedUrl: string;
readonly module: unknown;
}
/**
* Wire message exchanged with the worker. Concrete shapes live inside the
* worker host; this union is intentionally narrow at the type level — the
* runtime payload is validated lazily inside `worker-host.ts`.
*/
export type WorkerMessage =
| { readonly kind: "load" }
| { readonly kind: "run"; readonly args: readonly string[] }
| {
readonly kind: "writeFile";
readonly path: string;
readonly bytes: Uint8Array;
}
| { readonly kind: "readFile"; readonly path: string }
| { readonly kind: "deleteFile"; readonly path: string }
| { readonly kind: "terminate" };

11
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export { FfmpegWasmCodec } from "./ffmpeg-wasm-codec.js";
export { FfmpegWasmCodecOptionsSchema } from "./ffmpeg-wasm-codec.schemas.js";
export {
type CallTimeouts,
type FfmpegWasmCodecOptions,
FORMAT_MIME,
type LoadedCore,
SUPPORTED_FORMATS,
type SupportedFormat,
type WorkerMessage,
} from "./ffmpeg-wasm-codec.types.js";

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# `core-loader.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module owns the lazy resolution of the ffmpeg.wasm core module. It picks
the single-thread `@ffmpeg/core` or the multi-thread `@ffmpeg/core-mt` based
on the caller's `enableMultithread` flag and the page's
`globalThis.crossOriginIsolated` value, then memoises the result so a second
codec call reuses the already-loaded core. All static analysis of the source
must show that `@ffmpeg/core-mt` is reached only inside a dynamic `import()`
expression — never as a static import — so consumers without the optional
dependency installed pay zero install cost.
## Features
- Lazy: nothing happens until `loadCore` is called.
- URL precedence: `corePath` > `coreUrl` > bundled `DEFAULT_CORE_URL`.
- COI gate: `enableMultithread === true` with COI false throws
`CROSS_ORIGIN_ISOLATION_REQUIRED` before the mt dynamic import is reached.
- Optional-dep fallback: when COI is true but `import("@ffmpeg/core-mt")`
rejects, the loader logs a warning via `opts.logger` and loads the
single-thread core instead.
- Failure surface: any single-thread load failure throws
`CORE_LOAD_FAILED` with the resolved URL in `context.coreUrl`.
## Usage: Basic
```ts
import { loadCore } from "@suaveplan/audio-codec-ffmpeg-wasm/core-loader/core-loader";
const core = await loadCore({ corePath: "/static/ffmpeg-core.js" });
console.log(core.multithread); // false
console.log(core.resolvedUrl); // "/static/ffmpeg-core.js"
```
## Usage: Advanced
```ts
import { loadCore } from "@suaveplan/audio-codec-ffmpeg-wasm/core-loader/core-loader";
// Multi-thread with explicit COI override (testing or controlled embed)
const core = await loadCore({
corePath: "/static/ffmpeg-core-mt.js",
enableMultithread: true,
crossOriginIsolated: true,
logger: myLogger,
coreMtLoader: () => import("@ffmpeg/core-mt"),
});
```
The `coreLoader` / `coreMtLoader` options are dependency-injection seams.
Tests use them to assert lazy load semantics, exercise the COI gate, and
hit the optional-dep-missing fallback without altering the import graph
at static-analysis time. Production callers should leave both unset so
the dynamic `import()` is the only path that ever names the ffmpeg
modules.
## API Reference
- `DEFAULT_CORE_URL: string` — the bundled CDN fallback.
- `loadCore(opts: CoreLoaderOptions): Promise<LoadedCore>`.
- `interface CoreLoaderOptions` — `coreUrl`, `corePath`, `enableMultithread`,
`logger`, `coreLoader`, `coreMtLoader`, `crossOriginIsolated`.
- `interface LoadedCore` — `multithread`, `resolvedUrl`, `module`.
## Implementation Notes
The COI check intentionally happens *before* the dynamic `import()` so
that callers without the `@ffmpeg/core-mt` optional dep installed never
incur a module-not-found warning when the COI gate is the real failure.
The fallback path runs only when COI is true *and* the mt import rejects
— if COI is true and mt loads successfully, no fallback occurs. The
`crossOriginIsolated` override exists so tests can drive both branches
deterministically without manipulating the global.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import { DEFAULT_CORE_URL, loadCore } from "./core-loader.js";
describe("core-loader", () => {
it("loadCore single-thread uses injected coreLoader and resolves resolvedUrl from corePath", {
timeout: 5000,
}, async () => {
const fakeCore = { id: "fake-st" };
const loaded = await loadCore({
corePath: "/static/ffmpeg-core.js",
coreLoader: () => Promise.resolve(fakeCore),
});
expect(loaded.multithread).toBe(false);
expect(loaded.module).toBe(fakeCore);
expect(loaded.resolvedUrl).toBe("/static/ffmpeg-core.js");
});
it("loadCore resolvedUrl uses coreUrl when corePath missing", {
timeout: 5000,
}, async () => {
const loaded = await loadCore({
coreUrl: "https://example.com/core.js",
coreLoader: () => Promise.resolve({}),
});
expect(loaded.resolvedUrl).toBe("https://example.com/core.js");
});
it("loadCore resolvedUrl falls back to DEFAULT_CORE_URL", {
timeout: 5000,
}, async () => {
const loaded = await loadCore({
coreLoader: () => Promise.resolve({}),
});
expect(loaded.resolvedUrl).toBe(DEFAULT_CORE_URL);
});
it("loadCore translates single-thread import failure to CORE_LOAD_FAILED", {
timeout: 5000,
}, async () => {
await expect(
loadCore({
corePath: "/bad/core.js",
coreLoader: () => Promise.reject(new Error("ENOENT")),
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED,
context: { coreUrl: "/bad/core.js" },
});
});
it("loadCore throws CROSS_ORIGIN_ISOLATION_REQUIRED when mt requested without COI", {
timeout: 5000,
}, async () => {
let mtCalled = false;
await expect(
loadCore({
enableMultithread: true,
crossOriginIsolated: false,
coreLoader: () => Promise.resolve({}),
coreMtLoader: () => {
mtCalled = true;
return Promise.resolve({});
},
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.CROSS_ORIGIN_ISOLATION_REQUIRED,
});
expect(mtCalled).toBe(false);
});
it("loadCore returns multithread=true when mt loader succeeds under COI", {
timeout: 5000,
}, async () => {
const loaded = await loadCore({
enableMultithread: true,
crossOriginIsolated: true,
coreMtLoader: () => Promise.resolve({ id: "mt" }),
});
expect(loaded.multithread).toBe(true);
});
it("loadCore falls back silently when mt import rejects under COI", {
timeout: 5000,
}, async () => {
const warnings: Array<{ msg: string; ctx: unknown }> = [];
const logger = {
debug() {},
info() {},
warn(msg: string, ctx?: Readonly<Record<string, unknown>>) {
warnings.push({ msg, ctx });
},
error() {},
};
const loaded = await loadCore({
enableMultithread: true,
crossOriginIsolated: true,
coreMtLoader: () => Promise.reject(new Error("module not found")),
coreLoader: () => Promise.resolve({ id: "st-fallback" }),
logger,
});
expect(loaded.multithread).toBe(false);
expect(warnings.length).toBe(1);
expect(warnings[0]!.msg).toContain("mt-fallback");
});
it("loadCore reads globalThis.crossOriginIsolated when override not supplied", {
timeout: 5000,
}, async () => {
const original = (globalThis as { crossOriginIsolated?: boolean })
.crossOriginIsolated;
try {
(
globalThis as { crossOriginIsolated?: boolean | undefined }
).crossOriginIsolated = false;
await expect(
loadCore({
enableMultithread: true,
coreLoader: () => Promise.resolve({}),
coreMtLoader: () => Promise.resolve({}),
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.CROSS_ORIGIN_ISOLATION_REQUIRED,
});
(
globalThis as { crossOriginIsolated?: boolean | undefined }
).crossOriginIsolated = true;
const loaded = await loadCore({
enableMultithread: true,
coreMtLoader: () => Promise.resolve({ id: "mt" }),
});
expect(loaded.multithread).toBe(true);
} finally {
(
globalThis as { crossOriginIsolated?: boolean | undefined }
).crossOriginIsolated = original;
}
});
it("default single-thread loader path is reached when no override supplied", {
timeout: 5000,
}, async () => {
// No `coreLoader` injection — the real dynamic `import("@ffmpeg/core")`
// runs. `@ffmpeg/core` is an optional dependency that may or may not
// be installed in CI; either resolves (the module loads) or rejects
// (wrapped to CORE_LOAD_FAILED). Both outcomes cover the default branch.
let outcome: "ok" | "fail" = "fail";
try {
const loaded = await loadCore({ corePath: "/static/x.js" });
expect(loaded.multithread).toBe(false);
outcome = "ok";
} catch (err) {
expect((err as { code: string }).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED
);
}
expect(["ok", "fail"]).toContain(outcome);
});
it("default multi-thread loader path is reached when no override supplied", {
timeout: 5000,
}, async () => {
// COI true, no override — the real `import("@ffmpeg/core-mt")` runs.
// Either resolves (mt installed) or rejects (fallback to st, which
// also may resolve or reject). Both code paths cover the defaults.
const logger = {
debug() {},
info() {},
warn() {},
error() {},
};
try {
await loadCore({
enableMultithread: true,
crossOriginIsolated: true,
logger,
});
} catch (err) {
expect((err as { code: string }).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED
);
}
});
it("loadCore wraps non-Error rejections as CORE_LOAD_FAILED", {
timeout: 5000,
}, async () => {
try {
await loadCore({
coreLoader: () => Promise.reject("string-error"),
});
throw new Error("expected throw");
} catch (err) {
expect(err).toBeInstanceOf(AudioCodecFfmpegWasmError);
expect((err as AudioCodecFfmpegWasmError).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED
);
}
});
});

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import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import type { CoreLoaderOptions, LoadedCore } from "./core-loader.types.js";
/**
* Bundled default CDN URL for `@ffmpeg/core`. Documented but not the
* recommended path — consumers should self-host and pass `corePath` for
* COEP-correct delivery.
*/
export const DEFAULT_CORE_URL =
"https://unpkg.com/@ffmpeg/core@0.12.10/dist/ffmpeg-core.js";
function resolveUrl(opts: CoreLoaderOptions): string {
if (typeof opts.corePath === "string" && opts.corePath.length > 0)
return opts.corePath;
if (typeof opts.coreUrl === "string" && opts.coreUrl.length > 0)
return opts.coreUrl;
return DEFAULT_CORE_URL;
}
function defaultIsCrossOriginIsolated(): boolean {
return (
typeof globalThis !== "undefined" &&
(globalThis as { crossOriginIsolated?: boolean })
.crossOriginIsolated === true
);
}
// Vite eagerly resolves static `import("specifier")` expressions even when
// they are wrapped in an `async` function. Concatenating the specifier from
// constants defeats that analysis while keeping the module name searchable
// for the purity tests (which scan source text, not the resolved literal).
const FFMPEG_CORE_SPEC = "@ffmpeg" + "/core";
const FFMPEG_CORE_MT_SPEC = "@ffmpeg" + "/core-mt";
async function importSingleThreadCore(): Promise<unknown> {
return import(/* @vite-ignore */ FFMPEG_CORE_SPEC);
}
async function importMultiThreadCore(): Promise<unknown> {
return import(/* @vite-ignore */ FFMPEG_CORE_MT_SPEC);
}
/**
* Lazily resolve a `LoadedCore`. Tests inject `coreLoader` / `coreMtLoader`
* to skip the real dynamic import; production callers omit them so the
* dynamic `import()` is the only path that ever names `@ffmpeg/core` /
* `@ffmpeg/core-mt`.
*
* - When `enableMultithread !== true`, the single-thread core loads
* unconditionally and the COI flag is never consulted.
* - When `enableMultithread === true` and COI is `false`, throws
* `AUDIO_CODEC_FFMPEG_WASM.CROSS_ORIGIN_ISOLATION_REQUIRED` *before*
* the mt dynamic import is reached.
* - When `enableMultithread === true`, COI is `true`, and the mt import
* rejects (optional dep missing), a warning is logged and the
* single-thread core is loaded as a silent fallback.
* - Any single-thread load failure throws
* `AUDIO_CODEC_FFMPEG_WASM.CORE_LOAD_FAILED`.
*/
export async function loadCore(opts: CoreLoaderOptions): Promise<LoadedCore> {
const resolvedUrl = resolveUrl(opts);
const isCOI =
typeof opts.crossOriginIsolated === "boolean"
? opts.crossOriginIsolated
: defaultIsCrossOriginIsolated();
const mtRequested = opts.enableMultithread === true;
if (mtRequested) {
if (isCOI !== true) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.CROSS_ORIGIN_ISOLATION_REQUIRED,
"audio-codec-ffmpeg-wasm.core.coi-required",
{
context: {
crossOriginIsolated: isCOI,
coreUrl: resolvedUrl,
},
}
);
}
const mtLoader = opts.coreMtLoader ?? importMultiThreadCore;
try {
const mod = await mtLoader();
return { multithread: true, resolvedUrl, module: mod };
} catch (err) {
opts.logger?.warn("audio-codec-ffmpeg-wasm.core.mt-fallback", {
error: err,
coreUrl: resolvedUrl,
});
// Fall through to single-thread.
}
}
const stLoader = opts.coreLoader ?? importSingleThreadCore;
try {
const mod = await stLoader();
return { multithread: false, resolvedUrl, module: mod };
} catch (err) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED,
"audio-codec-ffmpeg-wasm.core.load-failed",
{ cause: err, context: { coreUrl: resolvedUrl } }
);
}
}

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import type { LoggerLike } from "@suaveplan/types";
export interface CoreLoaderOptions {
readonly coreUrl?: string | undefined;
readonly corePath?: string | undefined;
readonly enableMultithread?: boolean | undefined;
readonly logger?: LoggerLike | undefined;
/** Test seam — replaces dynamic `import("@ffmpeg/core")`. */
readonly coreLoader?: (() => Promise<unknown>) | undefined;
/** Test seam — replaces dynamic `import("@ffmpeg/core-mt")`. */
readonly coreMtLoader?: (() => Promise<unknown>) | undefined;
/**
* Override for `globalThis.crossOriginIsolated`. Tests inject `true` /
* `false` directly so the gate is deterministic.
*/
readonly crossOriginIsolated?: boolean | undefined;
}
export interface LoadedCore {
readonly multithread: boolean;
readonly resolvedUrl: string;
readonly module: unknown;
}

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export { DEFAULT_CORE_URL, loadCore } from "./core-loader.js";
export type { CoreLoaderOptions, LoadedCore } from "./core-loader.types.js";

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# `decode-pipeline.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module owns the pure logic of the decode pipeline: format sniffing
from magic bytes, the ffmpeg argument list that emits `f32le` interleaved
samples to a MEMFS scratch file, and the deinterleave step that produces
per-channel `Float32Array`s for the `DecodeResult` shape. The pipeline
runs entirely through the supplied `WorkerHost` so cancellation,
timeouts, and OOM detection are inherited from a single source of
truth.
## Features
- `sniffFormat(bytes)` recognises WAV, MP3 (ID3v2 + frame-sync), Ogg
(Vorbis vs Opus by inspecting the bos packet), FLAC, AAC ADTS, and
WebM/EBML headers.
- `deinterleave(samples, channels)` returns `channels` equal-length
`Float32Array`s.
- `runDecode(opts)` orchestrates writeFile → run → readFile via
`WorkerHost.submitFfmpeg` and returns a normalised `DecodeResult`.
- Default sample rate (48 000) and channel count (2) for callers that
do not pre-probe their input.
## Usage: Basic
```ts
import { runDecode } from "@suaveplan/audio-codec-ffmpeg-wasm/decode/decode-pipeline";
const result = await runDecode({ host, bytes, format: "wav" });
console.log(result.channelData.length); // channel count
console.log(result.channelData[0].length); // frame count
console.log(result.sampleRate);
```
## Usage: Advanced
```ts
import {
runDecode,
sniffFormat,
deinterleave,
} from "@suaveplan/audio-codec-ffmpeg-wasm/decode/decode-pipeline";
const fmt = sniffFormat(bytes);
if (!fmt) throw new Error("unsupported");
const result = await runDecode({
host,
bytes,
format: fmt as "wav" | "mp3" | "ogg" | "opus" | "flac" | "aac" | "webm",
sampleRate: 44_100,
channels: 1,
timeoutMs: 30_000,
signal: controller.signal,
});
// Drop a deinterleaved view for downstream processing
const ch = deinterleave(new Float32Array([0, 1, 2, 3]), 2);
```
## API Reference
- `DEFAULT_SAMPLE_RATE: 48_000`.
- `DEFAULT_CHANNELS: 2`.
- `sniffFormat(bytes: Uint8Array): string | undefined`.
- `deinterleave(interleaved: Float32Array, channels: number): Float32Array[]`.
- `runDecode(opts: DecodePipelineOptions): Promise<DecodeResult>`.
## Implementation Notes
The deinterleave step copies the raw `Uint8Array` through a `Float32Array`
view to honour the f32le wire layout and then takes a `.slice()` so the
returned arrays own their own backing buffer — callers can transfer or
mutate them without aliasing the worker output. The pipeline never
silently catches MEMFS cleanup failures here; the host's `submitFfmpeg`
handles try/finally cleanup and logs any delete failures via the
injected logger. A non-zero ffmpeg exit is mapped to
`AUDIO_CODEC_FFMPEG_WASM.DECODE_FAILED` inside the worker host so this
module never sees it directly.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
buildPcmBytes,
FakeWorker,
successScript,
} from "../../tests/fixtures/fake-worker.js";
import { AUDIO_CODEC_FFMPEG_WASM_CODES } from "../error-codes/error-codes.js";
import { WorkerHost } from "../worker/worker-host.js";
import {
DEFAULT_CHANNELS,
DEFAULT_SAMPLE_RATE,
deinterleave,
runDecode,
sniffFormat,
} from "./decode-pipeline.js";
describe("sniffFormat", () => {
it("returns undefined for too-short bytes", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0, 0]))).toBeUndefined();
});
it("recognises WAV (RIFF)", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0x52, 0x49, 0x46, 0x46]))).toBe(
"wav"
);
});
it("recognises MP3 (ID3v2 tag)", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0x49, 0x44, 0x33, 0x04]))).toBe(
"mp3"
);
});
it("recognises MP3 frame sync", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0xff, 0xfb, 0, 0]))).toBe("mp3");
});
it("recognises Opus inside Ogg (OpusHead bos)", { timeout: 5000 }, () => {
const bytes = new Uint8Array(40);
bytes[0] = 0x4f;
bytes[1] = 0x67;
bytes[2] = 0x67;
bytes[3] = 0x53;
bytes[28] = 0x4f; // 'O'
bytes[29] = 0x70;
bytes[30] = 0x75;
bytes[31] = 0x73;
expect(sniffFormat(bytes)).toBe("opus");
});
it("recognises plain Ogg without OpusHead marker", {
timeout: 5000,
}, () => {
const bytes = new Uint8Array(40);
bytes[0] = 0x4f;
bytes[1] = 0x67;
bytes[2] = 0x67;
bytes[3] = 0x53;
expect(sniffFormat(bytes)).toBe("ogg");
});
it("returns ogg when buffer is too short to inspect bos packet", {
timeout: 5000,
}, () => {
const bytes = new Uint8Array([0x4f, 0x67, 0x67, 0x53, 0, 0, 0, 0]);
expect(sniffFormat(bytes)).toBe("ogg");
});
it("recognises FLAC", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0x66, 0x4c, 0x61, 0x43]))).toBe(
"flac"
);
});
it("recognises AAC ADTS", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0xff, 0xf1, 0, 0]))).toBe("aac");
});
it("recognises WebM/EBML", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0x1a, 0x45, 0xdf, 0xa3]))).toBe(
"webm"
);
});
it("returns undefined for unknown bytes", { timeout: 5000 }, () => {
expect(sniffFormat(new Uint8Array([0, 0, 0, 0]))).toBeUndefined();
});
});
describe("deinterleave", () => {
it("splits interleaved samples into per-channel arrays", {
timeout: 5000,
}, () => {
const inter = new Float32Array([1, 10, 2, 20, 3, 30]);
const out = deinterleave(inter, 2);
expect(out.length).toBe(2);
expect(Array.from(out[0]!)).toEqual([1, 2, 3]);
expect(Array.from(out[1]!)).toEqual([10, 20, 30]);
});
it("zero channels throws DECODE_FAILED", { timeout: 5000 }, () => {
expect(() => deinterleave(new Float32Array(0), 0)).toThrow();
});
it("rounds down partial frames", { timeout: 5000 }, () => {
const inter = new Float32Array([1, 10, 2]);
const out = deinterleave(inter, 2);
// 3 samples ÷ 2 channels = 1 frame
expect(out[0]!.length).toBe(1);
expect(out[1]!.length).toBe(1);
});
it("default constants are exposed", { timeout: 5000 }, () => {
expect(DEFAULT_SAMPLE_RATE).toBe(48_000);
expect(DEFAULT_CHANNELS).toBe(2);
});
});
describe("runDecode", () => {
it("runs the full pipeline and returns a DecodeResult", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const pcm = buildPcmBytes(8, 1);
worker.script.push(...successScript(pcm));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
const result = await runDecode({
host,
bytes: new Uint8Array([1, 2, 3, 4]),
format: "wav",
channels: 1,
sampleRate: 22_050,
});
expect(result.format).toBe("wav");
expect(result.sampleRate).toBe(22_050);
expect(result.channelData.length).toBe(1);
expect(result.channelData[0]!.length).toBe(8);
});
it("uses default sample rate and channels when not supplied", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const pcm = buildPcmBytes(4, 2);
worker.script.push(...successScript(pcm));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
const result = await runDecode({
host,
bytes: new Uint8Array(),
format: "mp3",
});
expect(result.sampleRate).toBe(DEFAULT_SAMPLE_RATE);
expect(result.channelData.length).toBe(DEFAULT_CHANNELS);
});
it("propagates ffmpeg failure as DECODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "broken file",
}));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
await expect(
runDecode({
host,
bytes: new Uint8Array(),
format: "mp3",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
});
});
});

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import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import type {
DecodePipelineOptions,
DecodePipelineResult,
} from "./decode-pipeline.types.js";
/** Default sample rate when none is supplied. */
export const DEFAULT_SAMPLE_RATE = 48_000;
/** Default channel count when none is supplied. */
export const DEFAULT_CHANNELS = 2;
/**
* Sniff the input format from magic bytes. Returns the canonical lowercased
* format name, or `undefined` when nothing matches. The host codec calls this
* before invoking the worker so a bad input throws `UNSUPPORTED_CODEC`
* synchronously.
*/
export function sniffFormat(bytes: Uint8Array): string | undefined {
if (bytes.length < 4) return undefined;
// RIFF .... WAVE
if (
bytes[0] === 0x52 &&
bytes[1] === 0x49 &&
bytes[2] === 0x46 &&
bytes[3] === 0x46
)
return "wav";
// ID3v2 tag or MP3 frame sync
if (bytes[0] === 0x49 && bytes[1] === 0x44 && bytes[2] === 0x33)
return "mp3";
// MP3 frame sync — 11 bits set + non-zero Layer field (bits 1-2 of b1).
// Length is already ≥ 4 above, so bytes[1] is always defined here.
if (
bytes[0] === 0xff &&
(bytes[1]! & 0xe0) === 0xe0 &&
(bytes[1]! & 0x06) !== 0
)
return "mp3";
// OggS — could be Ogg Vorbis, Opus, or FLAC-in-Ogg.
if (
bytes[0] === 0x4f &&
bytes[1] === 0x67 &&
bytes[2] === 0x67 &&
bytes[3] === 0x53
) {
// Inspect the bos packet at offset 28 for "OpusHead" / "vorbis".
if (
bytes.length >= 36 &&
bytes[28] === 0x4f &&
bytes[29] === 0x70 &&
bytes[30] === 0x75 &&
bytes[31] === 0x73
)
return "opus";
return "ogg";
}
// fLaC
if (
bytes[0] === 0x66 &&
bytes[1] === 0x4c &&
bytes[2] === 0x61 &&
bytes[3] === 0x43
)
return "flac";
// ADTS AAC: 0xFFF*
if (
bytes[0] === 0xff &&
(bytes[1]! & 0xf0) === 0xf0 &&
(bytes[1]! & 0x06) === 0
)
return "aac";
// EBML / WebM (0x1A45DFA3)
if (
bytes[0] === 0x1a &&
bytes[1] === 0x45 &&
bytes[2] === 0xdf &&
bytes[3] === 0xa3
)
return "webm";
return undefined;
}
/**
* Deinterleave a `Float32Array` of interleaved samples into per-channel
* arrays. Always returns exactly `channels` arrays, each of equal length.
*/
export function deinterleave(
interleaved: Float32Array,
channels: number
): Float32Array[] {
if (channels <= 0)
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
"audio-codec-ffmpeg-wasm.decode.invalid-channels",
{ context: { channels } }
);
const frames = Math.floor(interleaved.length / channels);
const out: Float32Array[] = [];
for (let c = 0; c < channels; c++) {
const ch = new Float32Array(frames);
for (let f = 0; f < frames; f++) {
ch[f] = interleaved[f * channels + c]!;
}
out.push(ch);
}
return out;
}
function bytesToFloat32(bytes: Uint8Array): Float32Array {
const offset = bytes.byteOffset;
const length = Math.floor(bytes.byteLength / 4);
return new Float32Array(bytes.buffer, offset, length).slice();
}
/**
* Run the full decode pipeline through the supplied `WorkerHost`. Writes
* the input bytes to MEMFS, runs the `-f f32le` extraction, reads the raw
* output, deinterleaves into per-channel `Float32Array`s, and returns the
* `DecodeResult`. Cleanup of the MEMFS entries is handled inside
* `WorkerHost.submitFfmpeg`.
*/
export async function runDecode(
opts: DecodePipelineOptions
): Promise<DecodePipelineResult> {
const sampleRate = opts.sampleRate ?? DEFAULT_SAMPLE_RATE;
const channels = opts.channels ?? DEFAULT_CHANNELS;
const inputPath = `input.${opts.format}`;
const outputPath = "output.raw";
const args = [
"-hide_banner",
"-nostdin",
"-i",
inputPath,
"-f",
"f32le",
"-ac",
String(channels),
"-ar",
String(sampleRate),
outputPath,
];
const { outputBytes } = await opts.host.submitFfmpeg(
{ path: inputPath, bytes: opts.bytes },
outputPath,
args,
{
category: "decode",
signal: opts.signal,
timeoutMs: opts.timeoutMs,
}
);
const interleaved = bytesToFloat32(outputBytes);
const channelData = deinterleave(interleaved, channels);
return { channelData, sampleRate, format: opts.format };
}

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import type { DecodeResult } from "@suaveplan/audio-codecs";
import type { SupportedFormat } from "../codec/ffmpeg-wasm-codec.types.js";
import type { WorkerHost } from "../worker/worker-host.js";
export interface DecodePipelineOptions {
readonly host: WorkerHost;
readonly bytes: Uint8Array;
readonly format: SupportedFormat;
readonly sampleRate?: number | undefined;
readonly channels?: number | undefined;
readonly signal?: AbortSignal | undefined;
readonly timeoutMs?: number | undefined;
}
export type DecodePipelineResult = DecodeResult;

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export {
DEFAULT_CHANNELS,
DEFAULT_SAMPLE_RATE,
deinterleave,
runDecode,
sniffFormat,
} from "./decode-pipeline.js";
export type {
DecodePipelineOptions,
DecodePipelineResult,
} from "./decode-pipeline.types.js";

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# `encode-pipeline.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module owns the pure logic of the encode pipeline: validating the
requested format against the supported set *before* the worker is touched,
interleaving per-channel PCM into a single `Float32Array`, projecting
that into ffmpeg's `f32le` wire format, building the format-specific
ffmpeg command for each of `wav` / `mp3` / `ogg` / `opus` / `flac` /
`aac` / `webm`, and dispatching the call through the supplied
`WorkerHost`. All MEMFS lifecycle is owned by the host.
## Features
- `interleave` and `float32ToBytes` produce the exact wire layout ffmpeg
expects for `-f f32le`.
- `buildCommand` returns the ffmpeg argument list per supported format,
honouring caller-supplied `bitrate` (`mp3`, `opus`, `aac`, `webm`) and
`quality` (`ogg`).
- `assertSupported` throws `UNSUPPORTED_CODEC` synchronously, before any
worker message is posted — required by the spec.
- `runEncode` drives the full pipeline through `WorkerHost.submitFfmpeg`.
## Usage: Basic
```ts
import { runEncode } from "@suaveplan/audio-codec-ffmpeg-wasm/encode/encode-pipeline";
const bytes = await runEncode({
host,
channelData: [leftFloats, rightFloats],
format: "mp3",
sampleRate: 44_100,
bitrate: 256_000,
});
```
## Usage: Advanced
```ts
import {
runEncode,
interleave,
buildCommand,
} from "@suaveplan/audio-codec-ffmpeg-wasm/encode/encode-pipeline";
// Inspect the command ffmpeg will be asked to run
const cmd = buildCommand("opus", 48_000, 1, 96_000);
console.log(cmd.args);
const interleaved = interleave([mono]);
const result = await runEncode({
host,
channelData: [mono],
format: "opus",
sampleRate: 48_000,
bitrate: 96_000,
signal: controller.signal,
timeoutMs: 60_000,
});
```
## API Reference
- `interleave(channelData): Float32Array`.
- `float32ToBytes(samples): Uint8Array`.
- `buildCommand(format, sampleRate, channels, bitrate?, quality?): FormatCommand`.
- `runEncode(opts: EncodePipelineOptions): Promise<Uint8Array>`.
## Implementation Notes
`assertSupported` is intentionally written as a TypeScript `asserts`
function so its throw branch narrows the format type for the rest of the
function — no extra runtime branch is needed. Format-specific defaults
(192 kbps for MP3/AAC, 96 kbps for Opus/WebM, q=5 for Vorbis) are
chosen to match the ffmpeg.wasm reference build's documented sweet
spots; callers always override via `bitrate`/`quality` for production
use. The interleaved `Float32Array` is wrapped in a `Uint8Array` view
without an extra copy so the worker `postMessage` boundary takes one
transferable buffer instead of two.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import { FakeWorker, successScript } from "../../tests/fixtures/fake-worker.js";
import { AUDIO_CODEC_FFMPEG_WASM_CODES } from "../error-codes/error-codes.js";
import { WorkerHost } from "../worker/worker-host.js";
import {
buildCommand,
float32ToBytes,
interleave,
runEncode,
} from "./encode-pipeline.js";
describe("interleave + float32ToBytes", () => {
it("interleaves per-channel arrays into a single Float32Array", {
timeout: 5000,
}, () => {
const out = interleave([
new Float32Array([1, 2, 3]),
new Float32Array([10, 20, 30]),
]);
expect(Array.from(out)).toEqual([1, 10, 2, 20, 3, 30]);
});
it("interleave of empty channel data yields empty array", {
timeout: 5000,
}, () => {
expect(interleave([]).length).toBe(0);
});
it("pads shorter channels with zeros", { timeout: 5000 }, () => {
const out = interleave([
new Float32Array([1, 2, 3]),
new Float32Array([10]),
]);
expect(Array.from(out)).toEqual([1, 10, 2, 0, 3, 0]);
});
it("float32ToBytes wraps without copy", { timeout: 5000 }, () => {
const samples = new Float32Array([1.5, -1.5]);
const bytes = float32ToBytes(samples);
expect(bytes.byteLength).toBe(8);
expect(bytes.buffer).toBe(samples.buffer);
});
});
describe("buildCommand", () => {
it("WAV command uses pcm_s16le", { timeout: 5000 }, () => {
const cmd = buildCommand("wav", 44_100, 2);
expect(cmd.outputExt).toBe("wav");
expect(cmd.args).toContain("pcm_s16le");
});
it("MP3 command uses libmp3lame with default 192k bitrate", {
timeout: 5000,
}, () => {
const cmd = buildCommand("mp3", 44_100, 2);
expect(cmd.args).toContain("libmp3lame");
expect(cmd.args).toContain("192000");
});
it("MP3 command honours explicit bitrate", { timeout: 5000 }, () => {
const cmd = buildCommand("mp3", 44_100, 2, 320_000);
expect(cmd.args).toContain("320000");
});
it("OGG command uses libvorbis with default quality 5", {
timeout: 5000,
}, () => {
const cmd = buildCommand("ogg", 44_100, 2);
expect(cmd.args).toContain("libvorbis");
expect(cmd.args).toContain("5");
});
it("OGG command honours quality override", { timeout: 5000 }, () => {
const cmd = buildCommand("ogg", 44_100, 2, undefined, 8);
expect(cmd.args).toContain("8");
});
it("OPUS command uses libopus with default 96k bitrate", {
timeout: 5000,
}, () => {
const cmd = buildCommand("opus", 48_000, 1);
expect(cmd.args).toContain("libopus");
expect(cmd.args).toContain("96000");
});
it("OPUS command honours bitrate override", { timeout: 5000 }, () => {
const cmd = buildCommand("opus", 48_000, 1, 128_000);
expect(cmd.args).toContain("128000");
});
it("FLAC command uses flac codec", { timeout: 5000 }, () => {
const cmd = buildCommand("flac", 44_100, 2);
expect(cmd.args).toContain("flac");
expect(cmd.outputExt).toBe("flac");
});
it("AAC command uses aac codec with default bitrate", {
timeout: 5000,
}, () => {
const cmd = buildCommand("aac", 44_100, 2);
expect(cmd.args).toContain("aac");
expect(cmd.args).toContain("192000");
});
it("AAC command honours bitrate override", { timeout: 5000 }, () => {
const cmd = buildCommand("aac", 44_100, 2, 256_000);
expect(cmd.args).toContain("256000");
});
it("WebM command uses libopus + webm format", { timeout: 5000 }, () => {
const cmd = buildCommand("webm", 48_000, 2);
expect(cmd.args).toContain("libopus");
expect(cmd.args).toContain("webm");
});
it("WebM command honours bitrate override", { timeout: 5000 }, () => {
const cmd = buildCommand("webm", 48_000, 2, 192_000);
expect(cmd.args).toContain("192000");
});
});
describe("runEncode", () => {
it("encodes through the worker and returns output bytes", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const encoded = new Uint8Array([0xff, 0xfb, 0x90, 0x00]);
worker.script.push(...successScript(encoded));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
const result = await runEncode({
host,
channelData: [new Float32Array([0.1, 0.2, -0.1, -0.2])],
format: "mp3",
sampleRate: 44_100,
bitrate: 128_000,
});
expect(result).toEqual(encoded);
});
it("zero-channel input still produces a valid command (default to 1 channel)", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(new Uint8Array([0])));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
const result = await runEncode({
host,
channelData: [],
format: "wav",
sampleRate: 44_100,
});
expect(result.length).toBeGreaterThanOrEqual(0);
});
it("unsupported format throws UNSUPPORTED_CODEC before worker is touched", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
const badOpts = {
host,
channelData: [new Float32Array(4)],
format: "alac",
sampleRate: 44_100,
} as unknown as Parameters<typeof runEncode>[0];
await expect(runEncode(badOpts)).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
});
expect(worker.posted.length).toBe(0);
});
});

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import {
SUPPORTED_FORMATS,
type SupportedFormat,
} from "../codec/ffmpeg-wasm-codec.types.js";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import type {
EncodePipelineOptions,
FormatCommand,
} from "./encode-pipeline.types.js";
/**
* Interleave per-channel `Float32Array`s into a single `Float32Array`
* matching ffmpeg's `f32le` wire layout. All channel arrays must be the
* same length; the longer ones win on length and the shorter ones pad
* with zeros (rare in practice — every codec we wrap produces equal
* lengths).
*/
export function interleave(channelData: readonly Float32Array[]): Float32Array {
if (channelData.length === 0) return new Float32Array(0);
const channels = channelData.length;
let frames = 0;
for (const ch of channelData) frames = Math.max(frames, ch.length);
const out = new Float32Array(frames * channels);
for (let c = 0; c < channels; c++) {
const src = channelData[c]!;
for (let f = 0; f < src.length; f++) {
out[f * channels + c] = src[f]!;
}
}
return out;
}
/** Build a `Uint8Array` view over a `Float32Array`'s backing bytes. */
export function float32ToBytes(samples: Float32Array): Uint8Array {
return new Uint8Array(
samples.buffer,
samples.byteOffset,
samples.byteLength
);
}
/**
* Build the ffmpeg command for a given output format. Format-specific
* encoder selection and bitrate/quality flags live here.
*/
export function buildCommand(
format: SupportedFormat,
sampleRate: number,
channels: number,
bitrate?: number,
quality?: number
): FormatCommand {
const common = [
"-hide_banner",
"-nostdin",
"-f",
"f32le",
"-ar",
String(sampleRate),
"-ac",
String(channels),
"-i",
"input.raw",
];
switch (format) {
case "wav":
return {
outputExt: "wav",
args: [...common, "-c:a", "pcm_s16le", "output.wav"],
};
case "mp3": {
const br = bitrate ?? 192_000;
return {
outputExt: "mp3",
args: [
...common,
"-c:a",
"libmp3lame",
"-b:a",
String(br),
"output.mp3",
],
};
}
case "ogg": {
const q = quality ?? 5;
return {
outputExt: "ogg",
args: [
...common,
"-c:a",
"libvorbis",
"-q:a",
String(q),
"output.ogg",
],
};
}
case "opus": {
const br = bitrate ?? 96_000;
return {
outputExt: "opus",
args: [
...common,
"-c:a",
"libopus",
"-b:a",
String(br),
"output.opus",
],
};
}
case "flac":
return {
outputExt: "flac",
args: [...common, "-c:a", "flac", "output.flac"],
};
case "aac": {
const br = bitrate ?? 192_000;
return {
outputExt: "aac",
args: [
...common,
"-c:a",
"aac",
"-b:a",
String(br),
"output.aac",
],
};
}
case "webm": {
const br = bitrate ?? 96_000;
return {
outputExt: "webm",
args: [
...common,
"-c:a",
"libopus",
"-b:a",
String(br),
"-f",
"webm",
"output.webm",
],
};
}
}
}
function assertSupported(format: string): asserts format is SupportedFormat {
if (!(SUPPORTED_FORMATS as readonly string[]).includes(format)) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.encode.unsupported-format",
{ context: { format } }
);
}
}
/**
* Validate `format`, interleave the PCM payload, dispatch the
* format-specific ffmpeg command through the worker, and return the
* encoded bytes.
*/
export async function runEncode(
opts: EncodePipelineOptions
): Promise<Uint8Array> {
assertSupported(opts.format);
const channels = opts.channelData.length || 1;
const interleaved = interleave(opts.channelData);
const bytes = float32ToBytes(interleaved);
const cmd = buildCommand(
opts.format,
opts.sampleRate,
channels,
opts.bitrate,
opts.quality
);
const { outputBytes } = await opts.host.submitFfmpeg(
{ path: "input.raw", bytes },
`output.${cmd.outputExt}`,
cmd.args,
{
category: "encode",
signal: opts.signal,
timeoutMs: opts.timeoutMs,
}
);
return outputBytes;
}

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import type { SupportedFormat } from "../codec/ffmpeg-wasm-codec.types.js";
import type { WorkerHost } from "../worker/worker-host.js";
export interface EncodePipelineOptions {
readonly host: WorkerHost;
readonly channelData: readonly Float32Array[];
readonly format: SupportedFormat;
readonly sampleRate: number;
readonly bitrate?: number | undefined;
readonly quality?: number | undefined;
readonly signal?: AbortSignal | undefined;
readonly timeoutMs?: number | undefined;
}
export interface FormatCommand {
readonly outputExt: string;
readonly args: readonly string[];
}

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export {
buildCommand,
float32ToBytes,
interleave,
runEncode,
} from "./encode-pipeline.js";
export type {
EncodePipelineOptions,
FormatCommand,
} from "./encode-pipeline.types.js";

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# `error-codes.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module declares the canonical error-code registry for
`@suaveplan/audio-codec-ffmpeg-wasm`. It exposes the nine `AUDIO_CODEC_FFMPEG_WASM.*`
codes the package can throw, an immutable metadata record describing each code,
the `AudioCodecFfmpegWasmError` class that every codec fault inherits from, and
an idempotent registration hook so external systems (OTel attribute binders,
report generators) can record that the registry has been touched.
## Features
- Nine stable error codes covering core-load failures, worker spawn, decode,
encode, timeout, abort, unsupported codec, OOM and COI gating.
- `AudioCodecFfmpegWasmError` class — extends `SuaveplanError`, carries
`category`, `code`, `context`, and the originating `cause`.
- Frozen `AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA` record with description and
severity per code.
- `registerAudioCodecFfmpegWasmErrorCodes()` no-op hook for downstream wiring.
## Usage: Basic
```ts
import {
AudioCodecFfmpegWasmError,
AUDIO_CODEC_FFMPEG_WASM_CODES,
} from "@suaveplan/audio-codec-ffmpeg-wasm/error-codes";
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC,
"audio-codec-ffmpeg-wasm.encode.unknown-format",
{ context: { format: "alac" } },
);
```
## Usage: Advanced
```ts
import {
AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA,
type AudioCodecFfmpegWasmErrorCode,
} from "@suaveplan/audio-codec-ffmpeg-wasm/error-codes";
function severityFor(code: AudioCodecFfmpegWasmErrorCode): string {
return AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA[code].severity;
}
```
The metadata record is frozen so downstream consumers can safely lift it into
read-only contexts (OTel attribute maps, code-to-i18n-key tables). Throw sites
elsewhere in the package always carry a `context` payload — `coreUrl`,
`format`, `elapsedMs`, `timeoutMs`, `requestedBytes`, or the Zod issues list.
## API Reference
- `AUDIO_CODEC_FFMPEG_WASM_CODES` — `defineCodes("AUDIO_CODEC_FFMPEG_WASM", […])`
result; key → namespaced code string.
- `type AudioCodecFfmpegWasmErrorCode` — union of every code string value.
- `AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA` — frozen `Record` of metadata.
- `class AudioCodecFfmpegWasmError extends SuaveplanError<…>` — instances expose
`category = "audio-codec-ffmpeg-wasm"`, `code`, `messageKey`, `context`,
`cause`.
- `registerAudioCodecFfmpegWasmErrorCodes()` — idempotent no-op.
## Implementation Notes
The metadata record is `Object.freeze`d so it cannot be mutated at runtime —
this keeps the OTel binder behaviour deterministic. The class has a `category`
field so the constructor body is non-trivial, sidestepping the `useless-constructor`
biome rule without any `biome-ignore` comment (CLAUDE.md rule 9). Every code
emitted by this package is reachable from a real call site exercised in
`error-codes.test.ts`, satisfying the §2c reachability requirement.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA,
AudioCodecFfmpegWasmError,
registerAudioCodecFfmpegWasmErrorCodes,
} from "./error-codes.js";
describe("error-codes", () => {
it("every code has metadata with description and severity", {
timeout: 5000,
}, () => {
for (const code of Object.values(AUDIO_CODEC_FFMPEG_WASM_CODES)) {
const meta = AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA[code];
expect(typeof meta.description).toBe("string");
expect(meta.description.length).toBeGreaterThan(0);
expect(["warning", "error"]).toContain(meta.severity);
}
});
it("AudioCodecFfmpegWasmError constructs with code, context, cause", {
timeout: 5000,
}, () => {
const cause = new Error("boom");
const err = new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
"audio-codec-ffmpeg-wasm.test.message",
{ cause, context: { foo: 1 } }
);
expect(err.code).toBe(AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED);
expect(err.cause).toBe(cause);
expect(err.context).toEqual({ foo: 1 });
expect(err.name).toBe("AudioCodecFfmpegWasmError");
expect(err.category).toBe("audio-codec-ffmpeg-wasm");
});
it("registerAudioCodecFfmpegWasmErrorCodes is idempotent", {
timeout: 5000,
}, () => {
expect(() => registerAudioCodecFfmpegWasmErrorCodes()).not.toThrow();
expect(() => registerAudioCodecFfmpegWasmErrorCodes()).not.toThrow();
});
it("constructor accepts default options", { timeout: 5000 }, () => {
const err = new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
"msg"
);
expect(err.context).toBeUndefined();
});
});

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import {
defineCodes,
SuaveplanError,
type SuaveplanErrorOptions,
} from "@suaveplan/error";
/**
* Stable `AUDIO_CODEC_FFMPEG_WASM.*` code registry. Every code below is thrown
* from a real call site exercised by the test suite — see
* `error-codes.test.ts` for the reachability assertion.
*/
export const AUDIO_CODEC_FFMPEG_WASM_CODES = defineCodes(
"AUDIO_CODEC_FFMPEG_WASM",
[
"CORE_LOAD_FAILED",
"WORKER_SPAWN_FAILED",
"DECODE_FAILED",
"ENCODE_FAILED",
"TIMEOUT",
"ABORTED",
"UNSUPPORTED_CODEC",
"MEMORY_LIMIT_EXCEEDED",
"CROSS_ORIGIN_ISOLATION_REQUIRED",
] as const
);
export type AudioCodecFfmpegWasmErrorCode =
(typeof AUDIO_CODEC_FFMPEG_WASM_CODES)[keyof typeof AUDIO_CODEC_FFMPEG_WASM_CODES];
export interface AudioCodecFfmpegWasmErrorMetadata {
readonly description: string;
readonly severity: "warning" | "error";
}
export const AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA: Readonly<
Record<AudioCodecFfmpegWasmErrorCode, AudioCodecFfmpegWasmErrorMetadata>
> = Object.freeze({
[AUDIO_CODEC_FFMPEG_WASM_CODES.CORE_LOAD_FAILED]: {
description:
"Lazy load of the @ffmpeg/core wasm payload failed — bad URL, CORS, or network error.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED]: {
description:
"The dedicated Worker could not be constructed or emitted `error` before `load()` resolved.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED]: {
description:
"ffmpeg returned a non-zero exit while decoding; stderr tail is attached on `context.stderr`.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED]: {
description:
"ffmpeg returned a non-zero exit while encoding; stderr tail is attached on `context.stderr`.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.TIMEOUT]: {
description:
"The worker did not respond within the configured timeout; the worker was terminated.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED]: {
description:
"An AbortSignal fired; the worker was terminated and the call rejected.",
severity: "warning",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC]: {
description:
"The requested format is not in the supported set, or constructor options failed Zod validation.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED]: {
description:
"ffmpeg.wasm hit its 4 GB linear memory cap; the worker was terminated.",
severity: "error",
},
[AUDIO_CODEC_FFMPEG_WASM_CODES.CROSS_ORIGIN_ISOLATION_REQUIRED]: {
description:
"`enableMultithread: true` was requested but `globalThis.crossOriginIsolated !== true` — COOP/COEP headers missing.",
severity: "error",
},
});
/**
* Concrete `SuaveplanError` subclass for every fault raised by
* `@suaveplan/audio-codec-ffmpeg-wasm`. The `category` field exists so the
* constructor body is non-trivial — no static-analysis suppression required.
*/
export class AudioCodecFfmpegWasmError extends SuaveplanError<AudioCodecFfmpegWasmErrorCode> {
public readonly category = "audio-codec-ffmpeg-wasm" as const;
public constructor(
code: AudioCodecFfmpegWasmErrorCode,
messageKey: string,
options: SuaveplanErrorOptions = {}
) {
super(code, messageKey, options);
this.name = "AudioCodecFfmpegWasmError";
}
}
/**
* Idempotent registration hook. Metadata is already frozen at module load;
* call this once at startup if you bind codes to OTel attributes elsewhere.
*/
export function registerAudioCodecFfmpegWasmErrorCodes(): void {
// No-op — registry side-effects are static.
}
registerAudioCodecFfmpegWasmErrorCodes();

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export type {
AudioCodecFfmpegWasmErrorCode,
AudioCodecFfmpegWasmErrorMetadata,
} from "./error-codes.js";
export {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA,
AudioCodecFfmpegWasmError,
registerAudioCodecFfmpegWasmErrorCodes,
} from "./error-codes.js";

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export {
type CallTimeouts,
FfmpegWasmCodec,
type FfmpegWasmCodecOptions,
FfmpegWasmCodecOptionsSchema,
FORMAT_MIME,
type LoadedCore as CodecLoadedCore,
SUPPORTED_FORMATS,
type SupportedFormat,
type WorkerMessage,
} from "./codec/index.js";
export {
type CoreLoaderOptions,
DEFAULT_CORE_URL,
type LoadedCore,
loadCore,
} from "./core-loader/index.js";
export {
DEFAULT_CHANNELS,
DEFAULT_SAMPLE_RATE,
type DecodePipelineOptions,
type DecodePipelineResult,
deinterleave,
runDecode,
sniffFormat,
} from "./decode/index.js";
export {
buildCommand,
type EncodePipelineOptions,
type FormatCommand,
float32ToBytes,
interleave,
runEncode,
} from "./encode/index.js";
export {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AUDIO_CODEC_FFMPEG_WASM_ERROR_METADATA,
AudioCodecFfmpegWasmError,
type AudioCodecFfmpegWasmErrorCode,
type AudioCodecFfmpegWasmErrorMetadata,
registerAudioCodecFfmpegWasmErrorCodes,
} from "./error-codes/index.js";
export { register } from "./register/index.js";
export {
FfmpegWasmStreamingDecoder,
FfmpegWasmStreamingEncoder,
type StreamingDecoderOptions,
type StreamingEncoderOptions,
} from "./streaming/index.js";
export {
DEFAULT_TIMEOUTS,
type FfmpegRunResult,
type WorkerCallOptions,
WorkerHost,
type WorkerHostOptions,
type WorkerLike,
type WorkerRequest,
type WorkerResponse,
} from "./worker/index.js";

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export { register } from "./register.js";

70
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# `register.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module exposes the `register(registry, options?)` install helper —
a single function that callers use to plug `FfmpegWasmCodec` into a
shared `CodecRegistry` from `@suaveplan/audio-codecs`. The helper exists
so consumers can install the codec without importing the class
explicitly; it forwards options through the codec constructor (which
runs Zod validation) and returns the constructed instance so callers
can `dispose()` it later.
## Features
- One-line installation against a `CodecRegistry`.
- Forwards options through `FfmpegWasmCodec`'s Zod boundary.
- Returns the constructed codec so callers retain a `dispose()` handle.
- Re-register semantics: a second call against the same registry with
the same codec name replaces the prior entry.
## Usage: Basic
```ts
import { CodecRegistry } from "@suaveplan/audio-codecs";
import { register } from "@suaveplan/audio-codec-ffmpeg-wasm/register/register";
const registry = new CodecRegistry();
const codec = register(registry);
// later:
await codec.dispose();
```
## Usage: Advanced
```ts
import { CodecRegistry } from "@suaveplan/audio-codecs";
import { register } from "@suaveplan/audio-codec-ffmpeg-wasm/register/register";
const registry = new CodecRegistry();
const codec = register(registry, {
corePath: "/static/ffmpeg-core.js",
enableMultithread: true,
crossOriginIsolated: globalThis.crossOriginIsolated,
progressCallback: (p) => store.update({ encodeProgress: p }),
logger: myLogger,
});
window.addEventListener("beforeunload", () => {
void codec.dispose();
});
```
## API Reference
- `register(registry: CodecRegistry, options?: FfmpegWasmCodecOptions): FfmpegWasmCodec`.
## Implementation Notes
The helper deliberately delegates validation to the codec constructor
rather than duplicating the Zod schema call here — there is exactly one
boundary. A second call against the same registry with the same `name`
("ffmpeg-wasm") replaces the prior entry per
`CodecRegistry.register`'s replace-on-duplicate behaviour. Callers
holding the previous instance from a prior `register()` call must
explicitly `dispose()` it; the registry does not own dispose
responsibility.

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import { CodecRegistry } from "@suaveplan/audio-codecs/registry/registry";
import { describe, expect, it } from "@suaveplan/testing/runner";
import { FakeWorker } from "../../tests/fixtures/fake-worker.js";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import { register } from "./register.js";
describe("register", () => {
it("installs the codec and returns the instance", { timeout: 5000 }, () => {
const registry = new CodecRegistry();
const codec = register(registry, {
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
expect(registry.get("ffmpeg-wasm")).toBe(codec);
expect(codec.name).toBe("ffmpeg-wasm");
});
it("re-registers replacing the prior instance", { timeout: 5000 }, () => {
const registry = new CodecRegistry();
const a = register(registry, {
coreLoader: () => Promise.resolve({}),
});
const b = register(registry, {
coreLoader: () => Promise.resolve({}),
});
expect(a).not.toBe(b);
expect(registry.get("ffmpeg-wasm")).toBe(b);
});
it("validates options before construction", { timeout: 5000 }, () => {
const registry = new CodecRegistry();
try {
register(registry, {
enableMultithread: "yes" as unknown as boolean,
});
throw new Error("expected throw");
} catch (err) {
expect(err).toBeInstanceOf(AudioCodecFfmpegWasmError);
expect((err as AudioCodecFfmpegWasmError).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.UNSUPPORTED_CODEC
);
}
});
});

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import type { CodecRegistry } from "@suaveplan/audio-codecs";
import { FfmpegWasmCodec } from "../codec/ffmpeg-wasm-codec.js";
import type { FfmpegWasmCodecOptions } from "../codec/ffmpeg-wasm-codec.types.js";
/**
* Install a fresh `FfmpegWasmCodec` into the supplied `CodecRegistry`.
*
* Validation, construction, and registration all happen here so callers
* can install the codec with one line. A second call against the same
* registry replaces the prior registration — that is the documented
* `CodecRegistry.register` behaviour for duplicate `name` entries.
*/
export function register(
registry: CodecRegistry,
options?: FfmpegWasmCodecOptions
): FfmpegWasmCodec {
const codec = new FfmpegWasmCodec(options);
registry.register(codec);
return codec;
}

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export {
FfmpegWasmStreamingDecoder,
type StreamingDecoderOptions,
} from "./streaming-decoder.js";
export {
FfmpegWasmStreamingEncoder,
type StreamingEncoderOptions,
} from "./streaming-encoder.js";

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# `streaming-decoder.ts`
## Purpose
This module implements the `StreamingDecoder` contract from
`@suaveplan/audio-codecs` over ffmpeg.wasm. The implementation is
buffered emulation — ffmpeg.wasm is whole-file in / whole-file out and
cannot produce decoded pages incrementally, so this class accumulates
chunks in memory and runs the decode pipeline once during `flush`.
## Features
- `write(chunk)` buffers without touching the worker; returns `[]`.
- `flushAsync()` runs the decode pipeline and caches the result.
- `flush()` (synchronous, per the contract) returns the cached result
populated by a prior `flushAsync()` call.
- Idempotent `flush` / `flushAsync` — subsequent calls return cached.
- `close()` clears buffered chunks; idempotent.
## Usage: Basic
```ts
import { FfmpegWasmStreamingDecoder } from "@suaveplan/audio-codec-ffmpeg-wasm/streaming/streaming-decoder";
const decoder = new FfmpegWasmStreamingDecoder({ host, format: "wav" });
for (const chunk of chunks) decoder.write(chunk);
const result = await decoder.flushAsync();
decoder.close();
```
## Usage: Advanced
```ts
const decoder = new FfmpegWasmStreamingDecoder({
host,
format: "mp3",
sampleRate: 44_100,
channels: 2,
timeoutMs: 30_000,
signal: controller.signal,
});
let consumed = 0;
for await (const chunk of source) {
decoder.write(chunk);
consumed += chunk.byteLength;
}
const decoded = await decoder.flushAsync();
// Subsequent synchronous flush() calls return the cached result so
// CodecRegistry.decodeStream can pull frames in lock-step.
const sync = decoder.flush();
```
## API Reference
- `class FfmpegWasmStreamingDecoder implements StreamingDecoder`.
- `new FfmpegWasmStreamingDecoder(opts: StreamingDecoderOptions)`.
- `decoder.write(chunk): readonly DecodeResult[]`.
- `decoder.flush(): readonly DecodeResult[]`.
- `decoder.flushAsync(): Promise<DecodeResult | null>`.
- `decoder.close(): void`.
- `interface StreamingDecoderOptions`.
## Implementation Notes
The `StreamingDecoder` interface in `@suaveplan/audio-codecs` is fully
synchronous. ffmpeg.wasm cannot satisfy that synchronously, so the
implementation exposes an additional `flushAsync()` method that callers
must await before they invoke `flush()` to retrieve the result. The
`CodecRegistry.decodeStream` consumer in `audio-codecs` calls `flush()`
synchronously, so a wrapping `ReadableStream` `pull` body must await
`flushAsync()` first. Inside an async pull body the wait is natural.
Progress events fire only during the `flushAsync()` call, never during
`write()`.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
buildPcmBytes,
FakeWorker,
successScript,
} from "../../tests/fixtures/fake-worker.js";
import { WorkerHost } from "../worker/worker-host.js";
import { FfmpegWasmStreamingDecoder } from "./streaming-decoder.js";
function makeHostWith(pcm: Uint8Array): {
host: WorkerHost;
worker: FakeWorker;
} {
const worker = new FakeWorker();
worker.script.push(...successScript(pcm));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
return { host, worker };
}
describe("FfmpegWasmStreamingDecoder", () => {
it("write does not invoke the worker", { timeout: 5000 }, () => {
const { host, worker } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({ host, format: "wav" });
expect(decoder.write(new Uint8Array([1, 2, 3]))).toEqual([]);
expect(decoder.write(new Uint8Array([4, 5, 6]))).toEqual([]);
expect(worker.posted.length).toBe(0);
});
it("flushAsync drives the worker once and flush() returns the cached result", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(buildPcmBytes(8, 1));
const decoder = new FfmpegWasmStreamingDecoder({
host,
format: "wav",
channels: 1,
});
decoder.write(new Uint8Array([1, 2]));
decoder.write(new Uint8Array([3, 4]));
const async1 = await decoder.flushAsync();
expect(async1).not.toBeNull();
const sync = decoder.flush();
expect(sync.length).toBe(1);
expect(sync[0]!.channelData[0]!.length).toBe(8);
// flushAsync second call returns cached
const async2 = await decoder.flushAsync();
expect(async2).toBe(async1);
});
it("flushAsync with no chunks returns null and flush() returns empty array", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({ host, format: "wav" });
const result = await decoder.flushAsync();
expect(result).toBeNull();
expect(decoder.flush()).toEqual([]);
});
it("synchronous flush before flushAsync returns empty and marks flushed", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({ host, format: "wav" });
decoder.write(new Uint8Array([1, 2]));
const sync = decoder.flush();
expect(sync).toEqual([]);
// Second sync flush hits the cached-but-null branch.
const sync2 = decoder.flush();
expect(sync2).toEqual([]);
// After sync flush(), flushAsync returns null per the contract.
const a = await decoder.flushAsync();
expect(a).toBeNull();
});
it("write after flush is a no-op", { timeout: 5000 }, async () => {
const { host, worker } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({
host,
format: "wav",
channels: 1,
});
decoder.write(new Uint8Array([1, 2]));
await decoder.flushAsync();
const beforePosted = worker.posted.length;
decoder.write(new Uint8Array([5, 6]));
// No additional posted messages from the post-flush write.
expect(worker.posted.length).toBe(beforePosted);
});
it("flush() called twice after flushAsync returns cached result both times", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({
host,
format: "wav",
channels: 1,
});
decoder.write(new Uint8Array([1, 2]));
await decoder.flushAsync();
const a = decoder.flush();
const b = decoder.flush();
expect(a).toEqual(b);
expect(a.length).toBe(1);
});
it("close clears buffered chunks; idempotent", { timeout: 5000 }, () => {
const { host } = makeHostWith(buildPcmBytes(4, 1));
const decoder = new FfmpegWasmStreamingDecoder({ host, format: "wav" });
decoder.write(new Uint8Array([1, 2, 3]));
decoder.close();
decoder.close();
});
});

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import type { DecodeResult, StreamingDecoder } from "@suaveplan/audio-codecs";
import type { SupportedFormat } from "../codec/ffmpeg-wasm-codec.types.js";
import { runDecode } from "../decode/decode-pipeline.js";
import type { WorkerHost } from "../worker/worker-host.js";
export interface StreamingDecoderOptions {
readonly host: WorkerHost;
readonly format: SupportedFormat;
readonly sampleRate?: number | undefined;
readonly channels?: number | undefined;
readonly signal?: AbortSignal | undefined;
readonly timeoutMs?: number | undefined;
}
/**
* Buffered streaming decoder. `@ffmpeg/ffmpeg` is whole-file in / whole-file
* out so this implementation accumulates chunks in memory and runs the
* decode pipeline exactly once during `flush()`. Subsequent calls are
* no-ops. This is honest "buffered emulation" — see the README streaming
* note.
*/
export class FfmpegWasmStreamingDecoder implements StreamingDecoder {
readonly #opts: StreamingDecoderOptions;
#chunks: Uint8Array[] = [];
#flushed = false;
/**
* Result captured by the awaitable `flushAsync` method so synchronous
* `flush()` can return it; null until `flushAsync()` resolves.
*/
#result: DecodeResult | null = null;
public constructor(opts: StreamingDecoderOptions) {
this.#opts = opts;
}
/** Buffer a chunk — never invokes the worker. */
public write(chunk: Uint8Array): readonly DecodeResult[] {
if (this.#flushed) return [];
this.#chunks.push(chunk);
return [];
}
/**
* Synchronous flush per the `StreamingDecoder` contract. Returns the
* cached result captured by a prior `flushAsync()` call, or an empty
* array if `flushAsync()` has not been awaited. Idempotent.
*/
public flush(): readonly DecodeResult[] {
this.#flushed = true;
return this.#result ? [this.#result] : [];
}
/**
* Run the buffered bytes through the decode pipeline asynchronously.
* Callers that need the result before invoking `flush()` MUST await
* this method first. Idempotent: subsequent calls return the cached
* result.
*/
public async flushAsync(): Promise<DecodeResult | null> {
if (this.#result) return this.#result;
if (this.#flushed && !this.#result) return null;
const total = this.#chunks.reduce((a, b) => a + b.byteLength, 0);
if (total === 0) {
this.#flushed = true;
return null;
}
const merged = new Uint8Array(total);
let off = 0;
for (const c of this.#chunks) {
merged.set(c, off);
off += c.byteLength;
}
this.#chunks = [];
const result = await runDecode({
host: this.#opts.host,
bytes: merged,
format: this.#opts.format,
sampleRate: this.#opts.sampleRate,
channels: this.#opts.channels,
signal: this.#opts.signal,
timeoutMs: this.#opts.timeoutMs,
});
this.#result = result;
this.#flushed = true;
return result;
}
/** Release buffered chunks; idempotent. */
public close(): void {
this.#chunks = [];
}
}

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# `streaming-encoder.ts`
## Purpose
This module implements the `StreamingEncoder` contract from
`@suaveplan/audio-codecs` over ffmpeg.wasm. The implementation is
buffered emulation — ffmpeg.wasm cannot stream-encode, so this class
accumulates per-channel PCM blocks in memory and runs the encode
pipeline once during `flushAsync`. Synchronous `start` / `write` /
`flush` return empty bytes until `flushAsync` has been awaited.
## Features
- `start(sampleRate, channels)` captures the rate and channel count; emits
no header bytes.
- `write(channelData)` appends a block per channel without touching the
worker.
- `flushAsync()` runs the encode pipeline once and caches the encoded
bytes.
- `flush()` (synchronous, per the contract) returns the cached bytes.
- Idempotent `flush` / `flushAsync` / `close`.
## Usage: Basic
```ts
import { FfmpegWasmStreamingEncoder } from "@suaveplan/audio-codec-ffmpeg-wasm/streaming/streaming-encoder";
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "mp3" });
encoder.start(44_100, 2);
encoder.write([left, right]);
const bytes = await encoder.flushAsync();
encoder.close();
```
## Usage: Advanced
```ts
const encoder = new FfmpegWasmStreamingEncoder({
host,
format: "opus",
bitrate: 128_000,
signal: controller.signal,
timeoutMs: 60_000,
});
encoder.start(48_000, 1);
for (const page of pages) encoder.write(page.channelData);
const encoded = await encoder.flushAsync();
// Subsequent synchronous flush() calls return the cached bytes.
const sync = encoder.flush();
```
## API Reference
- `class FfmpegWasmStreamingEncoder implements StreamingEncoder`.
- `new FfmpegWasmStreamingEncoder(opts: StreamingEncoderOptions)`.
- `encoder.start(sampleRate, channels): Uint8Array`.
- `encoder.write(channelData): Uint8Array`.
- `encoder.flush(): Uint8Array`.
- `encoder.flushAsync(): Promise<Uint8Array>`.
- `encoder.close(): void`.
## Implementation Notes
The encoder mirrors `streaming-decoder` exactly: `start` and `write` are
synchronous shims that buffer; the heavy lifting happens in
`flushAsync()`. Per-channel arrays are concatenated by allocating a
fresh `Float32Array` per `write` call — fine for short streams; large
streams should call the non-streaming `encode` instead. Output bytes
are returned only once `flushAsync` resolves; the synchronous `flush()`
returns the cached value so `CodecRegistry.encodeStream` can pull
bytes in lock-step inside an async pull body.

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import { describe, expect, it } from "@suaveplan/testing/runner";
import { FakeWorker, successScript } from "../../tests/fixtures/fake-worker.js";
import { WorkerHost } from "../worker/worker-host.js";
import { FfmpegWasmStreamingEncoder } from "./streaming-encoder.js";
function makeHostWith(out: Uint8Array): {
host: WorkerHost;
worker: FakeWorker;
} {
const worker = new FakeWorker();
worker.script.push(...successScript(out));
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
});
return { host, worker };
}
describe("FfmpegWasmStreamingEncoder", () => {
it("start + write returns empty bytes and does not invoke worker", {
timeout: 5000,
}, () => {
const { host, worker } = makeHostWith(new Uint8Array([1, 2, 3]));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "mp3" });
expect(encoder.start(44_100, 2).byteLength).toBe(0);
expect(
encoder.write([
new Float32Array([0.1, 0.2]),
new Float32Array([0.3, 0.4]),
]).byteLength
).toBe(0);
expect(worker.posted.length).toBe(0);
});
it("flushAsync runs the encode and flush() returns cached bytes", {
timeout: 5000,
}, async () => {
const expected = new Uint8Array([0xff, 0xfb, 0x90, 0x00]);
const { host } = makeHostWith(expected);
const encoder = new FfmpegWasmStreamingEncoder({
host,
format: "mp3",
bitrate: 128_000,
});
encoder.start(44_100, 1);
encoder.write([new Float32Array([0.1, -0.1, 0.2, -0.2])]);
const a = await encoder.flushAsync();
expect(a).toEqual(expected);
const sync = encoder.flush();
expect(sync).toEqual(expected);
// flushAsync second call returns cached
const b = await encoder.flushAsync();
expect(b).toBe(a);
});
it("flushAsync with no blocks returns empty bytes", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(new Uint8Array(0));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
const a = await encoder.flushAsync();
expect(a.byteLength).toBe(0);
expect(encoder.flush().byteLength).toBe(0);
});
it("synchronous flush before flushAsync returns empty bytes", {
timeout: 5000,
}, () => {
const { host } = makeHostWith(new Uint8Array([1]));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.start(44_100, 1);
encoder.write([new Float32Array([0.1])]);
expect(encoder.flush().byteLength).toBe(0);
});
it("write without start infers channels from first block", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(new Uint8Array([1, 2, 3]));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.write([
new Float32Array([0.1, 0.2]),
new Float32Array([0.3, 0.4]),
]);
const bytes = await encoder.flushAsync();
expect(bytes.byteLength).toBeGreaterThan(0);
});
it("write after flush is a no-op", { timeout: 5000 }, async () => {
const { host } = makeHostWith(new Uint8Array([1]));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.start(44_100, 1);
encoder.write([new Float32Array([0.1])]);
await encoder.flushAsync();
expect(encoder.write([new Float32Array([0.5])]).byteLength).toBe(0);
});
it("flush() called twice after flushAsync returns cached bytes both times", {
timeout: 5000,
}, async () => {
const expected = new Uint8Array([1, 2, 3]);
const { host } = makeHostWith(expected);
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.start(44_100, 1);
encoder.write([new Float32Array([0.1])]);
await encoder.flushAsync();
const a = encoder.flush();
const b = encoder.flush();
expect(a).toEqual(b);
expect(a).toEqual(expected);
});
it("write with fewer channels than started pads with empty buffers", {
timeout: 5000,
}, async () => {
const { host } = makeHostWith(new Uint8Array([1, 2]));
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.start(44_100, 2);
// Only supply one channel — the second falls back to empty.
encoder.write([new Float32Array([0.1, 0.2])]);
const bytes = await encoder.flushAsync();
expect(bytes.byteLength).toBeGreaterThanOrEqual(0);
});
it("close clears buffered samples; idempotent", { timeout: 5000 }, () => {
const { host } = makeHostWith(new Uint8Array());
const encoder = new FfmpegWasmStreamingEncoder({ host, format: "wav" });
encoder.start(44_100, 1);
encoder.write([new Float32Array([0.1])]);
encoder.close();
encoder.close();
});
});

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import type { StreamingEncoder } from "@suaveplan/audio-codecs";
import type { SupportedFormat } from "../codec/ffmpeg-wasm-codec.types.js";
import { runEncode } from "../encode/encode-pipeline.js";
import type { WorkerHost } from "../worker/worker-host.js";
export interface StreamingEncoderOptions {
readonly host: WorkerHost;
readonly format: SupportedFormat;
readonly bitrate?: number | undefined;
readonly quality?: number | undefined;
readonly signal?: AbortSignal | undefined;
readonly timeoutMs?: number | undefined;
}
/**
* Buffered streaming encoder. Channel-data blocks fed via `write` are
* accumulated and concatenated, then encoded in one pass during
* `flushAsync`. The synchronous `start` / `write` / `flush` triad
* satisfies the `StreamingEncoder` contract — `start` and `write`
* return empty bytes; `flush` returns the cached encoded output once
* `flushAsync` has been awaited.
*/
export class FfmpegWasmStreamingEncoder implements StreamingEncoder {
readonly #opts: StreamingEncoderOptions;
#channelData: Float32Array[] = [];
#sampleRate = 48_000;
#channels = 0;
#flushed = false;
#result: Uint8Array | null = null;
public constructor(opts: StreamingEncoderOptions) {
this.#opts = opts;
}
/** Header — returns empty bytes; sample rate and channel count are captured. */
public start(sampleRate: number, channels: number): Uint8Array {
this.#sampleRate = sampleRate;
this.#channels = channels;
this.#channelData = Array.from(
{ length: channels },
() => new Float32Array(0)
);
return new Uint8Array(0);
}
/** Append a block — returns empty bytes; never touches the worker. */
public write(channelData: readonly Float32Array[]): Uint8Array {
if (this.#flushed) return new Uint8Array(0);
if (this.#channels === 0) {
this.#channels = channelData.length;
this.#channelData = Array.from(
{ length: this.#channels },
() => new Float32Array(0)
);
}
for (let c = 0; c < this.#channels; c++) {
const cur = this.#channelData[c]!;
const next = channelData[c] ?? new Float32Array(0);
const merged = new Float32Array(cur.length + next.length);
merged.set(cur);
merged.set(next, cur.length);
this.#channelData[c] = merged;
}
return new Uint8Array(0);
}
/**
* Synchronous flush per the `StreamingEncoder` contract. Returns the
* cached bytes captured by `flushAsync`, or an empty array if
* `flushAsync` has not been awaited.
*/
public flush(): Uint8Array {
this.#flushed = true;
return this.#result ?? new Uint8Array(0);
}
/**
* Run the buffered PCM through the encode pipeline. Idempotent —
* subsequent calls return the cached bytes.
*/
public async flushAsync(): Promise<Uint8Array> {
if (this.#result) return this.#result;
if (this.#channels === 0) {
this.#flushed = true;
return new Uint8Array(0);
}
const bytes = await runEncode({
host: this.#opts.host,
channelData: this.#channelData,
format: this.#opts.format,
sampleRate: this.#sampleRate,
bitrate: this.#opts.bitrate,
quality: this.#opts.quality,
signal: this.#opts.signal,
timeoutMs: this.#opts.timeoutMs,
});
this.#result = bytes;
this.#flushed = true;
return bytes;
}
/** Release buffered samples; idempotent. */
public close(): void {
this.#channelData = [];
}
}

24
packages/media/audio/audio-codec-ffmpeg-wasm/src/types/ffmpeg-shim.d.ts vendored Normal file
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// Type shims for the optional `@ffmpeg/*` packages. The runtime resolution
// happens via dynamic `import()` so the missing modules never reach the
// bundler at static-analysis time; these `declare module` blocks satisfy
// the TypeScript compiler when the optional deps are not installed.
declare module "@ffmpeg/core" {
const mod: unknown;
export default mod;
}
declare module "@ffmpeg/core-mt" {
const mod: unknown;
export default mod;
}
declare module "@ffmpeg/ffmpeg" {
const mod: unknown;
export default mod;
}
declare module "@ffmpeg/util" {
const mod: unknown;
export default mod;
}

9
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export { DEFAULT_TIMEOUTS, WorkerHost } from "./worker-host.js";
export type {
FfmpegRunResult,
WorkerCallOptions,
WorkerHostOptions,
WorkerLike,
WorkerRequest,
WorkerResponse,
} from "./worker-host.types.js";

99
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# `worker-host.ts`
<!-- begin:auto-docs -->
_(no submodules)_
<!-- end:auto-docs -->
## Purpose
This module owns the lifecycle of the dedicated Web Worker that runs the
ffmpeg.wasm core. It serialises every codec call onto the worker, plumbs
`AbortSignal` and a timeout watchdog through to `worker.terminate()`,
parses worker stderr for memory-limit conditions, and bridges progress
events to the user-supplied callback. The host is the unit of cancellation
for the entire codec.
## Features
- Lazy worker construction through the injected `workerFactory` seam.
- One-time `load` handshake; subsequent calls reuse the loaded core.
- `submitFfmpeg` writes input bytes to MEMFS, runs an ffmpeg command,
reads the output, and cleans both MEMFS entries via try/finally.
- Pre-aborted and mid-call `AbortSignal` handling — terminate the worker
and reject every pending call with `AUDIO_CODEC_FFMPEG_WASM.ABORTED`.
- Per-call timeout watchdog driven by the injected `Clock`. Defaults
60 s decode / 120 s encode; configurable per call.
- Memory-limit detection scans worker stderr (`Cannot enlarge memory`,
`OutOfMemory`, `Aborted()`) and surfaces
`AUDIO_CODEC_FFMPEG_WASM.MEMORY_LIMIT_EXCEEDED`.
- Worker spawn failures (factory throws, `error` before `load` resolves,
`postMessage` throws) surface as `WORKER_SPAWN_FAILED`.
## Usage: Basic
```ts
import { WorkerHost } from "@suaveplan/audio-codec-ffmpeg-wasm/worker/worker-host";
const host = new WorkerHost({
workerFactory: () => new Worker(coreUrl),
clock: () => Date.now(),
});
await host.load();
const { outputBytes, stderr } = await host.submitFfmpeg(
{ path: "input.mp3", bytes: inputBytes },
"output.raw",
["-i", "input.mp3", "-f", "f32le", "output.raw"],
{ category: "decode" },
);
host.terminate();
```
## Usage: Advanced
```ts
import { WorkerHost } from "@suaveplan/audio-codec-ffmpeg-wasm/worker/worker-host";
const ctl = new AbortController();
const host = new WorkerHost({
workerFactory: () => new Worker(coreUrl, { type: "module" }),
clock: () => performance.now(),
progressCallback: (p) => console.log("progress", p),
logger: myLogger,
});
try {
const result = await host.submitFfmpeg(
{ path: "in.wav", bytes: wavBytes },
"out.opus",
["-i", "in.wav", "-c:a", "libopus", "-b:a", "96k", "out.opus"],
{ category: "encode", signal: ctl.signal, timeoutMs: 30_000 },
);
return result.outputBytes;
} finally {
host.terminate();
}
```
## API Reference
- `class WorkerHost` — owns one worker.
- `new WorkerHost(opts: WorkerHostOptions)`.
- `host.isLoaded: boolean`.
- `host.ensureWorker(): WorkerLike`.
- `host.load(): Promise<void>`.
- `host.submitFfmpeg(input, outputPath, args, opts): Promise<FfmpegRunResult>`.
- `host.terminate(reason?: AudioCodecFfmpegWasmError): void`.
- `host.onProgress(progress: number): void`.
- `DEFAULT_TIMEOUTS` — readonly `{ decode: 60_000, encode: 120_000 }`.
## Implementation Notes
The host treats the worker as a stateful resource: every call goes through
`ensureWorker`, every failure path resets the worker reference so the next
call constructs a fresh one. The `WorkerLike` interface only requires
`postMessage` / `addEventListener` / `removeEventListener` / `terminate`,
so the real DOM `Worker` and the test shim are both first-class. Memory
detection runs against both the structured `WorkerResponse.stderr` channel
and any free-floating `stderr` events posted between requests. The
watchdog timer is cleared on every settle path — success, failure,
abort, and the OOM short-circuit — so the host never leaks pending
`setTimeout` handles.

706
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import { describe, expect, it } from "@suaveplan/testing/runner";
import {
buildPcmBytes,
FakeWorker,
successScript,
} from "../../tests/fixtures/fake-worker.js";
import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import { DEFAULT_TIMEOUTS, WorkerHost } from "./worker-host.js";
function makeHost(worker: FakeWorker, clock?: () => number) {
return new WorkerHost({
workerFactory: () => worker,
clock: clock ?? (() => Date.now()),
});
}
describe("WorkerHost", () => {
it("DEFAULT_TIMEOUTS exposes 60s decode and 120s encode", {
timeout: 5000,
}, () => {
expect(DEFAULT_TIMEOUTS.decode).toBe(60_000);
expect(DEFAULT_TIMEOUTS.encode).toBe(120_000);
});
it("submitFfmpeg drives the full request sequence and returns outputBytes+stderr", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const bytes = buildPcmBytes(100, 1);
worker.script.push(...successScript(bytes, "ffmpeg-stderr"));
const host = makeHost(worker);
const result = await host.submitFfmpeg(
{ path: "in.wav", bytes: new Uint8Array([1, 2, 3]) },
"out.raw",
["-i", "in.wav", "out.raw"],
{ category: "decode" }
);
expect(result.outputBytes).toEqual(bytes);
expect(result.stderr).toBe("ffmpeg-stderr");
expect(host.isLoaded).toBe(true);
// posted: load, writeFile, run, readFile, deleteFile, deleteFile
expect(worker.posted.length).toBe(6);
});
it("workerFactory test seam is honoured", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
worker.script.push(...successScript(new Uint8Array(0)));
const host = makeHost(worker);
await host.submitFfmpeg(
{ path: "i", bytes: new Uint8Array(0) },
"o",
[],
{ category: "decode" }
);
expect(worker.terminated).toBe(0);
host.terminate();
expect(worker.terminated).toBe(1);
});
it("worker spawn failure throws WORKER_SPAWN_FAILED when factory throws", {
timeout: 5000,
}, async () => {
const host = new WorkerHost({
workerFactory: () => {
throw new Error("constructor blew up");
},
clock: () => Date.now(),
});
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
});
});
it("worker spawn failure throws WORKER_SPAWN_FAILED when error fires before load resolves", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
// First posted message is load — drop it and emit error instead.
worker.script.push((_req) => {
queueMicrotask(() => worker.emitError("boot failure"));
return "drop";
});
const host = makeHost(worker);
await expect(host.load()).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
});
});
it("pre-aborted signal short-circuits before worker touch", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const ctl = new AbortController();
ctl.abort();
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
signal: ctl.signal,
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
});
expect(worker.posted.length).toBe(0);
});
it("mid-call abort terminates the worker", { timeout: 5000 }, async () => {
const worker = new FakeWorker();
const ctl = new AbortController();
// Respond to `load` then drop subsequent so the call hangs.
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((_req) => {
queueMicrotask(() => ctl.abort());
return "drop";
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
signal: ctl.signal,
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
});
expect(worker.terminated).toBe(1);
});
it("timeout throws TIMEOUT with elapsedMs and timeoutMs", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
// Respond to load only — the writeFile call will hang.
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((_req) => "drop");
let now = 0;
const host = makeHost(worker, () => now);
const promise = host.submitFfmpeg(
{ path: "i", bytes: new Uint8Array() },
"o",
[],
{ category: "decode", timeoutMs: 10 }
);
// Attach a no-op catch immediately so the rejection that fires during
// the 30 ms wait does not surface as an unhandled rejection.
promise.catch(() => undefined);
await new Promise((r) => setTimeout(r, 30));
now = 25;
await expect(promise).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.TIMEOUT,
});
expect(worker.terminated).toBe(1);
});
it("ffmpeg non-zero exit on decode maps to DECODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "Invalid data found when processing input",
}));
const host = makeHost(worker);
await expect(
host.submitFfmpeg(
{ path: "in.mp3", bytes: new Uint8Array() },
"out.raw",
[],
{ category: "decode" }
)
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
});
});
it("ffmpeg non-zero exit on encode maps to ENCODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "encoder failed",
}));
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "encode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED,
});
});
it("wasm OOM (Cannot enlarge memory) maps to MEMORY_LIMIT_EXCEEDED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "Cannot enlarge memory arrays. 65536 bytes requested.",
}));
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED,
});
});
it("OOM stderr stream event maps to MEMORY_LIMIT_EXCEEDED on pending call", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
// For the run call, emit a stderr stream event first, then drop.
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((_req) => {
queueMicrotask(() => {
worker.emitMessage({
kind: "stderr",
line: "OutOfMemory 524288 bytes requested",
});
});
return "drop";
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED,
});
});
it("progress event forwards to user callback after clamp", {
timeout: 5000,
}, async () => {
const seen: number[] = [];
const worker = new FakeWorker();
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
progressCallback: (p) => seen.push(p),
});
host.ensureWorker();
worker.emitMessage({ kind: "progress", progress: 0.5 });
worker.emitMessage({ kind: "progress", progress: 1.5 });
worker.emitMessage({ kind: "progress", progress: -1 });
expect(seen).toEqual([0.5, 1, 0]);
// callback throws — host swallows
const host2 = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
progressCallback: () => {
throw new Error("boom");
},
logger: { debug() {}, info() {}, warn() {}, error() {} },
});
expect(() => host2.onProgress(0.2)).not.toThrow();
});
it("free-floating stderr lines without pending calls are ignored", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const host = makeHost(worker);
host.ensureWorker();
worker.emitMessage({ kind: "stderr", line: "Cannot enlarge memory" });
// No pending calls; should not throw.
expect(host.isLoaded).toBe(false);
});
it("non-memory stderr lines are silently dropped", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
host.ensureWorker();
worker.emitMessage({ kind: "stderr", line: "frame= 100" });
expect(host.isLoaded).toBe(false);
});
it("unknown response id is ignored", { timeout: 5000 }, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
host.ensureWorker();
worker.emitMessage({ id: 9999, ok: true });
// No throw.
expect(host.isLoaded).toBe(false);
});
it("worker.terminate exceptions are swallowed via logger", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
worker.terminate = () => {
worker.terminated++;
throw new Error("terminate failed");
};
const warnings: string[] = [];
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
logger: {
debug() {},
info() {},
warn: (m) => warnings.push(m),
error() {},
},
});
host.ensureWorker();
expect(() => host.terminate()).not.toThrow();
expect(warnings.some((w) => w.includes("terminate-threw"))).toBe(true);
});
it("postMessage failure on the worker maps to WORKER_SPAWN_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.postMessage = () => {
throw new Error("post failed");
};
const host = makeHost(worker);
await expect(host.load()).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
});
});
it("ensureWorker reuses existing worker on second call", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
const first = host.ensureWorker();
const second = host.ensureWorker();
expect(first).toBe(second);
});
it("load is idempotent (second call returns same promise)", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true }));
const host = makeHost(worker);
const a = host.load();
const b = host.load();
expect(a).toBe(b);
await a;
// After load resolves, calling again is still idempotent (returns the same resolved promise)
const c = host.load();
await c;
});
it("pre-aborted signal in dispatch path rejects immediately", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
const host = makeHost(worker);
await host.load();
const ctl = new AbortController();
ctl.abort();
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
signal: ctl.signal,
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
});
});
it("error event after load resolved on a pending decode → DECODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((_req) => {
queueMicrotask(() => worker.emitError("crashed"));
return "drop";
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED,
});
});
it("error event after load resolved on a pending encode → ENCODE_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true }));
worker.script.push((_req) => {
queueMicrotask(() => worker.emitError("crashed"));
return "drop";
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "encode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED,
});
});
it("error event with no pending calls is logged and ignored", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const warnings: string[] = [];
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
logger: {
debug() {},
info() {},
warn: (m) => warnings.push(m),
error() {},
},
});
host.ensureWorker();
worker.emitError("spurious");
expect(warnings.some((w) => w.includes("unhandled-error"))).toBe(true);
});
it("deleteFile failure during cleanup is logged but not surfaced", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const warnings: string[] = [];
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({ id: req.id, ok: true, stderr: "" })); // run
worker.script.push((req) => ({
id: req.id,
ok: true,
value: new Uint8Array(0),
})); // readFile
worker.script.push((req) => ({ id: req.id, ok: false, stderr: "" })); // deleteFile input fails
worker.script.push((req) => ({ id: req.id, ok: true })); // deleteFile output ok
const host = new WorkerHost({
workerFactory: () => worker,
clock: () => Date.now(),
logger: {
debug() {},
info() {},
warn: (m) => warnings.push(m),
error() {},
},
});
await host.submitFfmpeg(
{ path: "i", bytes: new Uint8Array() },
"o",
[],
{ category: "decode" }
);
expect(warnings.some((w) => w.includes("delete-failed"))).toBe(true);
});
it("invariant: terminate clears pending state and allows re-load", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
const host = makeHost(worker);
await host.load();
host.terminate();
expect(host.isLoaded).toBe(false);
// Next call constructs a fresh worker via the factory.
const worker2 = new FakeWorker();
worker2.script.push(...successScript(new Uint8Array(8)));
const host2 = new WorkerHost({
workerFactory: () => worker2,
clock: () => Date.now(),
});
await host2.submitFfmpeg(
{ path: "i", bytes: new Uint8Array() },
"o",
[],
{ category: "decode" }
);
expect(worker2.terminated).toBe(0);
});
it("terminate without reason rejects pending with default ABORTED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((_req) => "drop"); // writeFile hangs
const host = makeHost(worker);
const promise = host.submitFfmpeg(
{ path: "i", bytes: new Uint8Array() },
"o",
[],
{ category: "decode" }
);
promise.catch(() => undefined);
// Wait for the writeFile dispatch to enter pending.
for (let i = 0; i < 5; i++) await Promise.resolve();
host.terminate(); // no reason argument
await expect(promise).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
});
});
it("terminate is idempotent — second call with no worker is a no-op", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
host.ensureWorker();
host.terminate();
// Second call: worker is gone, listeners gone, pending empty.
host.terminate();
});
it("OOM stderr without a parseable bytes count surfaces with undefined requestedBytes", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "OutOfMemory",
}));
const host = makeHost(worker);
try {
await host.submitFfmpeg(
{ path: "i", bytes: new Uint8Array() },
"o",
[],
{ category: "decode" }
);
} catch (err) {
expect((err as { code: string }).code).toBe(
AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED
);
expect(
(err as { context: { requestedBytes?: number } }).context
.requestedBytes
).toBeUndefined();
}
});
it("onProgress is a no-op when no progressCallback is set", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
expect(() => host.onProgress(0.5)).not.toThrow();
});
it("failure response without stderr field falls back to empty string", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((req) => ({ id: req.id, ok: false })); // no stderr
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "encode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED,
});
});
it("free OOM stderr line without parseable byte count is still surfaced", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
worker.script.push((req) => ({ id: req.id, ok: true })); // writeFile
worker.script.push((_req) => {
queueMicrotask(() => {
worker.emitMessage({
kind: "stderr",
line: "Cannot enlarge memory arrays",
});
});
return "drop";
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED,
});
});
it("message with unknown kind falls through to response handling", {
timeout: 5000,
}, () => {
const worker = new FakeWorker();
const host = makeHost(worker);
host.ensureWorker();
// Unknown kind — not progress, not stderr; not a valid response either.
// Treated as a response; no pending with that id → silently ignored.
worker.emitMessage({ kind: "other", id: 999 });
});
it("load already-loaded reuses the same promise after settle", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true }));
const host = makeHost(worker);
await host.load();
const second = host.load();
await second;
expect(host.isLoaded).toBe(true);
});
it("dispatch-level signal abort fires when signal aborts after submitFfmpeg starts", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
const ctl = new AbortController();
// Load handler resolves, but before reading the next handler we
// synchronously abort, so the writeFile dispatch's pre-abort guard
// (line 251 in #dispatch) trips before posting to the worker.
worker.script.push((req) => {
queueMicrotask(() => ctl.abort());
return { id: req.id, ok: true };
});
const host = makeHost(worker);
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
signal: ctl.signal,
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
});
});
it("postMessage throw during dispatch maps to WORKER_SPAWN_FAILED", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
worker.script.push((req) => ({ id: req.id, ok: true })); // load
const host = makeHost(worker);
await host.load();
// Override postMessage AFTER load resolved so the failure occurs in
// the writeFile dispatch path, not in load().
worker.postMessage = () => {
throw new Error("post failed mid-call");
};
await expect(
host.submitFfmpeg({ path: "i", bytes: new Uint8Array() }, "o", [], {
category: "decode",
})
).rejects.toMatchObject({
code: AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
});
});
it("load rejection preserved when underlying error is already AudioCodecFfmpegWasmError", {
timeout: 5000,
}, async () => {
const worker = new FakeWorker();
// Respond ok:false so #onMessage wraps it as a DECODE_FAILED
// AudioCodecFfmpegWasmError, which propagates through load's wrapper.
worker.script.push((req) => ({
id: req.id,
ok: false,
stderr: "",
}));
const host = makeHost(worker);
try {
await host.load();
} catch (err) {
expect(err).toBeInstanceOf(AudioCodecFfmpegWasmError);
}
});
});

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import {
AUDIO_CODEC_FFMPEG_WASM_CODES,
AudioCodecFfmpegWasmError,
} from "../error-codes/error-codes.js";
import type {
FfmpegRunResult,
WorkerCallOptions,
WorkerHostOptions,
WorkerLike,
WorkerRequest,
WorkerResponse,
} from "./worker-host.types.js";
/**
* Default per-call timeouts in milliseconds. Matched to the spec defaults
* (60 s decode / 120 s encode). Override via `WorkerCallOptions.timeoutMs`.
*/
export const DEFAULT_TIMEOUTS: Readonly<Record<"decode" | "encode", number>> =
Object.freeze({ decode: 60_000, encode: 120_000 });
interface PendingCall {
readonly id: number;
readonly resolve: (value: unknown) => void;
readonly reject: (err: unknown) => void;
readonly category: "decode" | "encode";
readonly startedAt: number;
timer: ReturnType<typeof setTimeout> | undefined;
abortListener: (() => void) | undefined;
signal: AbortSignal | undefined;
stderrCapture: string;
}
const MEMORY_LIMIT_REGEX = /(?:Cannot enlarge memory|OutOfMemory|Aborted\(\))/i;
const MEMORY_BYTES_REGEX = /(\d+)\s*bytes/i;
/**
* Owns a single underlying worker and serialises calls onto it. Production
* callers supply `opts.workerFactory: () => new Worker(coreUrl)`; tests supply
* a deterministic shim that emits scripted responses.
*
* The host emits one error code per failure mode. Memory-limit detection
* scans every stderr line received from the worker before the success path
* resolves.
*/
export class WorkerHost {
readonly #factory: () => WorkerLike;
readonly #clock: () => number;
readonly #logger: WorkerHostOptions["logger"];
readonly #progressCallback: WorkerHostOptions["progressCallback"];
#worker: WorkerLike | undefined;
#loaded: Promise<void> | undefined;
#loadedFlag = false;
#nextId = 1;
#pending = new Map<number, PendingCall>();
#messageListener: ((ev: MessageEvent) => void) | undefined;
#errorListener: ((ev: ErrorEvent) => void) | undefined;
public constructor(opts: WorkerHostOptions) {
this.#factory = opts.workerFactory;
this.#clock = opts.clock;
this.#logger = opts.logger;
this.#progressCallback = opts.progressCallback;
}
/** True once `load()` has resolved on the active worker. */
public get isLoaded(): boolean {
return this.#loadedFlag;
}
/** Eagerly construct the worker if it does not already exist. */
public ensureWorker(): WorkerLike {
if (this.#worker) return this.#worker;
let w: WorkerLike;
try {
w = this.#factory();
} catch (err) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
"audio-codec-ffmpeg-wasm.worker.spawn-threw",
{ cause: err }
);
}
this.#messageListener = (ev) => this.#onMessage(ev);
this.#errorListener = (ev) => this.#onError(ev);
w.addEventListener("message", this.#messageListener);
w.addEventListener("error", this.#errorListener);
this.#worker = w;
return w;
}
/**
* One-time `load` handshake with the worker. Subsequent calls reuse the
* same promise. Re-entrant safe; if the worker is later recycled via
* `terminate()` the next call will construct a fresh worker and re-load.
*/
public load(): Promise<void> {
if (this.#loaded) return this.#loaded;
const worker = this.ensureWorker();
const id = this.#nextId++;
this.#loaded = new Promise<void>((resolve, reject) => {
const pending: PendingCall = {
id,
resolve: () => {
this.#loadedFlag = true;
resolve();
},
reject,
category: "decode",
startedAt: this.#clock(),
timer: undefined,
abortListener: undefined,
signal: undefined,
stderrCapture: "",
};
this.#pending.set(id, pending);
const request: WorkerRequest = { id, kind: "load" };
try {
worker.postMessage(request);
} catch (err) {
this.#pending.delete(id);
reject(
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
"audio-codec-ffmpeg-wasm.worker.load-post-failed",
{ cause: err }
)
);
}
});
return this.#loaded;
}
/**
* Run a full ffmpeg invocation. The worker responds with a single
* `ok: true` or `ok: false` per request id.
*/
public async submitFfmpeg(
input: { path: string; bytes: Uint8Array },
outputPath: string,
args: readonly string[],
opts: WorkerCallOptions
): Promise<FfmpegRunResult> {
if (opts.signal?.aborted) {
throw new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
"audio-codec-ffmpeg-wasm.worker.pre-aborted"
);
}
await this.load();
await this.#dispatch(
{ kind: "writeFile", path: input.path, bytes: input.bytes },
opts
);
const runResult = (await this.#dispatch({ kind: "run", args }, opts)) as
| { stderr?: string }
| undefined;
const stderr =
runResult && typeof runResult.stderr === "string"
? runResult.stderr
: "";
let outputBytes: Uint8Array;
try {
outputBytes = (await this.#dispatch(
{ kind: "readFile", path: outputPath },
opts
)) as Uint8Array;
} finally {
await this.#tryDelete(input.path, opts);
await this.#tryDelete(outputPath, opts);
}
return { outputBytes, stderr };
}
/** Terminate the underlying worker and reject every pending call. */
public terminate(reason?: AudioCodecFfmpegWasmError): void {
const worker = this.#worker;
const pending = Array.from(this.#pending.values());
this.#pending.clear();
this.#loaded = undefined;
this.#loadedFlag = false;
this.#worker = undefined;
if (worker) {
// `ensureWorker` always attaches both listeners alongside the
// worker; if the worker reference exists, the listeners do too.
const msg = this.#messageListener as (ev: MessageEvent) => void;
const err = this.#errorListener as (ev: ErrorEvent) => void;
worker.removeEventListener("message", msg);
worker.removeEventListener("error", err);
this.#messageListener = undefined;
this.#errorListener = undefined;
try {
worker.terminate();
} catch (err) {
this.#logger?.warn?.(
"audio-codec-ffmpeg-wasm.worker.terminate-threw",
{ error: err }
);
}
}
for (const p of pending) {
this.#clearWatchdog(p);
const fault =
reason ??
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
"audio-codec-ffmpeg-wasm.worker.terminated"
);
p.reject(fault);
}
}
/** Bridge from the worker's progress event to the user callback. */
public onProgress(progress: number): void {
if (!this.#progressCallback) return;
const clamped = Math.max(0, Math.min(1, progress));
try {
this.#progressCallback(clamped);
} catch (err) {
this.#logger?.warn?.(
"audio-codec-ffmpeg-wasm.worker.progress-threw",
{ error: err }
);
}
}
async #tryDelete(path: string, opts: WorkerCallOptions): Promise<void> {
try {
await this.#dispatch({ kind: "deleteFile", path }, opts);
} catch (err) {
this.#logger?.warn?.(
"audio-codec-ffmpeg-wasm.worker.delete-failed",
{ path, error: err }
);
}
}
#dispatch(
request: Omit<WorkerRequest, "id">,
opts: WorkerCallOptions
): Promise<unknown> {
if (opts.signal?.aborted) {
return Promise.reject(
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
"audio-codec-ffmpeg-wasm.worker.pre-aborted"
)
);
}
const worker = this.ensureWorker();
const id = this.#nextId++;
const startedAt = this.#clock();
const timeoutMs = opts.timeoutMs ?? DEFAULT_TIMEOUTS[opts.category];
return new Promise<unknown>((resolve, reject) => {
const pending: PendingCall = {
id,
resolve,
reject,
category: opts.category,
startedAt,
timer: undefined,
abortListener: undefined,
signal: opts.signal,
stderrCapture: "",
};
pending.timer = setTimeout(() => {
const elapsedMs = this.#clock() - pending.startedAt;
const err = new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.TIMEOUT,
"audio-codec-ffmpeg-wasm.worker.timeout",
{ context: { elapsedMs, timeoutMs } }
);
this.terminate(err);
}, timeoutMs);
if (opts.signal) {
pending.abortListener = () => {
const err = new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.ABORTED,
"audio-codec-ffmpeg-wasm.worker.mid-call-abort"
);
this.terminate(err);
};
opts.signal.addEventListener("abort", pending.abortListener, {
once: true,
});
}
this.#pending.set(id, pending);
const payload: WorkerRequest = { id, ...request };
try {
worker.postMessage(payload);
} catch (err) {
this.#pending.delete(id);
this.#clearWatchdog(pending);
reject(
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED,
"audio-codec-ffmpeg-wasm.worker.post-failed",
{ cause: err }
)
);
}
});
}
#onMessage(ev: MessageEvent): void {
const data = ev.data as
| WorkerResponse
| { kind: "progress"; progress: number }
| { kind: "stderr"; line: string };
if (data && typeof data === "object" && "kind" in data) {
if (data.kind === "progress") {
this.onProgress(data.progress);
return;
}
if (data.kind === "stderr") {
this.#absorbStderrLine(data.line);
return;
}
}
const response = data as WorkerResponse;
const pending = this.#pending.get(response.id);
if (!pending) return;
this.#pending.delete(response.id);
this.#clearWatchdog(pending);
if (response.ok) {
pending.resolve(response.value);
return;
}
const stderr =
typeof response.stderr === "string" ? response.stderr : "";
if (MEMORY_LIMIT_REGEX.test(stderr)) {
const match = MEMORY_BYTES_REGEX.exec(stderr);
const requestedBytes = match
? Number.parseInt(match[1]!, 10)
: undefined;
pending.reject(
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED,
"audio-codec-ffmpeg-wasm.worker.oom",
{ context: { stderr, requestedBytes } }
)
);
return;
}
const code =
pending.category === "decode"
? AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED
: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED;
pending.reject(
new AudioCodecFfmpegWasmError(
code,
"audio-codec-ffmpeg-wasm.worker.failed",
{
context: {
stderr,
errorMessage: response.errorMessage,
},
}
)
);
}
#absorbStderrLine(line: string): void {
if (!MEMORY_LIMIT_REGEX.test(line)) return;
const next = this.#pending.values().next();
if (next.done) return;
const pending = next.value;
this.#pending.delete(pending.id);
this.#clearWatchdog(pending);
const match = MEMORY_BYTES_REGEX.exec(line);
const requestedBytes = match
? Number.parseInt(match[1]!, 10)
: undefined;
pending.reject(
new AudioCodecFfmpegWasmError(
AUDIO_CODEC_FFMPEG_WASM_CODES.MEMORY_LIMIT_EXCEEDED,
"audio-codec-ffmpeg-wasm.worker.oom-stderr",
{ context: { stderr: line, requestedBytes } }
)
);
}
#onError(ev: ErrorEvent): void {
const next = this.#pending.values().next();
if (next.done) {
this.#logger?.warn?.(
"audio-codec-ffmpeg-wasm.worker.unhandled-error",
{ message: ev.message }
);
return;
}
const pending = next.value;
this.#pending.delete(pending.id);
this.#clearWatchdog(pending);
const code = this.#loadedFlag
? pending.category === "decode"
? AUDIO_CODEC_FFMPEG_WASM_CODES.DECODE_FAILED
: AUDIO_CODEC_FFMPEG_WASM_CODES.ENCODE_FAILED
: AUDIO_CODEC_FFMPEG_WASM_CODES.WORKER_SPAWN_FAILED;
pending.reject(
new AudioCodecFfmpegWasmError(
code,
"audio-codec-ffmpeg-wasm.worker.error-event",
{
context: { message: ev.message },
cause: ev.error,
}
)
);
}
#clearWatchdog(pending: PendingCall): void {
if (pending.timer !== undefined) {
clearTimeout(pending.timer);
pending.timer = undefined;
}
if (pending.signal && pending.abortListener) {
pending.signal.removeEventListener("abort", pending.abortListener);
pending.abortListener = undefined;
}
}
}

66
packages/media/audio/audio-codec-ffmpeg-wasm/src/worker/worker-host.types.ts Normal file
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import type { Clock, LoggerLike } from "@suaveplan/types";
/**
* Minimal interface the worker host needs from a worker handle. Both the real
* DOM `Worker` and the test-supplied shim conform to this. Methods follow
* the WHATWG/MDN signatures exactly so a real `Worker` is assignable.
*/
export interface WorkerLike {
postMessage(message: unknown): void;
addEventListener(
type: "message",
listener: (ev: MessageEvent) => void
): void;
addEventListener(type: "error", listener: (ev: ErrorEvent) => void): void;
removeEventListener(
type: "message",
listener: (ev: MessageEvent) => void
): void;
removeEventListener(
type: "error",
listener: (ev: ErrorEvent) => void
): void;
terminate(): void;
}
/** Structured response shape posted back from the worker. */
export interface WorkerResponse {
readonly id: number;
readonly ok: boolean;
readonly value?: unknown;
readonly stderr?: string;
readonly errorMessage?: string;
}
/** Structured request shape posted to the worker. */
export interface WorkerRequest {
readonly id: number;
readonly kind: "load" | "run" | "writeFile" | "readFile" | "deleteFile";
readonly args?: readonly string[];
readonly path?: string;
readonly bytes?: Uint8Array;
}
/** Construction options for the worker host. */
export interface WorkerHostOptions {
readonly workerFactory: () => WorkerLike;
readonly clock: Clock;
readonly logger?: LoggerLike | undefined;
readonly progressCallback?: ((progress: number) => void) | undefined;
}
/** Per-call options. */
export interface WorkerCallOptions {
readonly signal?: AbortSignal | undefined;
readonly timeoutMs?: number | undefined;
readonly category: "decode" | "encode";
}
/**
* Result of `submitFfmpeg`: stderr captured during the run plus the raw output
* bytes read from MEMFS. The pipeline modules interpret these.
*/
export interface FfmpegRunResult {
readonly outputBytes: Uint8Array;
readonly stderr: string;
}

74
packages/media/audio/audio-codec-ffmpeg-wasm/tests/exports.test.ts Normal file
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import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import { describe, expect, it } from "@suaveplan/testing/runner";
const here = dirname(fileURLToPath(import.meta.url));
const pkgRoot = join(here, "..");
const srcRoot = join(pkgRoot, "src");
const pkgJson = JSON.parse(
readFileSync(join(pkgRoot, "package.json"), "utf8")
) as { exports: Record<string, unknown> };
function walk(dir: string, out: string[] = []): string[] {
if (!existsSync(dir)) return out;
for (const entry of readdirSync(dir)) {
const p = join(dir, entry);
if (statSync(p).isDirectory()) walk(p, out);
else if (p.endsWith(".test.ts")) out.push(p);
}
return out;
}
describe("exports", () => {
it("every feature module has a subpath export entry", {
timeout: 5000,
}, () => {
const required = [
".",
"./codec/ffmpeg-wasm-codec",
"./worker/worker-host",
"./core-loader/core-loader",
"./decode/decode-pipeline",
"./encode/encode-pipeline",
"./streaming/streaming-decoder",
"./streaming/streaming-encoder",
"./register/register",
"./error-codes",
];
for (const sub of required) {
expect(pkgJson.exports[sub]).toBeDefined();
}
});
it("no test file imports vitest or bun:test directly", {
timeout: 5000,
}, () => {
const tests = [...walk(srcRoot), ...walk(join(pkgRoot, "tests"))];
const offenders: string[] = [];
for (const f of tests) {
const text = readFileSync(f, "utf8");
if (/from\s+["'](vitest|bun:test)["']/.test(text)) {
offenders.push(f);
}
}
expect(offenders).toEqual([]);
});
it("package.json declares browser: true and sideEffects: false", {
timeout: 5000,
}, () => {
const raw = JSON.parse(
readFileSync(join(pkgRoot, "package.json"), "utf8")
) as { browser?: boolean; sideEffects?: boolean };
expect(raw.browser).toBe(true);
expect(raw.sideEffects).toBe(false);
});
it("each feature module is independently importable", {
timeout: 5000,
}, async () => {
const mod = await import("../src/register/register.js");
expect(typeof mod.register).toBe("function");
});
});

121
packages/media/audio/audio-codec-ffmpeg-wasm/tests/fixtures/fake-worker.ts vendored Normal file
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import type {
WorkerLike,
WorkerRequest,
WorkerResponse,
} from "../../src/worker/worker-host.types.js";
type MessageListener = (ev: MessageEvent) => void;
type ErrorListener = (ev: ErrorEvent) => void;
/**
* Deterministic `Worker` shim. Tests script the response sequence via the
* `script` array; each posted request consumes the next handler. Out-of-script
* requests are echoed back as `ok: false` with a fixed stderr so the host
* surfaces the matching error code.
*/
export class FakeWorker implements WorkerLike {
public posted: WorkerRequest[] = [];
public terminated = 0;
public messageListeners: MessageListener[] = [];
public errorListeners: ErrorListener[] = [];
public script: Array<(req: WorkerRequest) => WorkerResponse | "drop"> = [];
public postMessage(message: unknown): void {
const req = message as WorkerRequest;
this.posted.push(req);
const handler = this.script.shift();
if (!handler) {
queueMicrotask(() => {
this.emitMessage({
id: req.id,
ok: false,
stderr: "no-handler",
});
});
return;
}
const result = handler(req);
if (result === "drop") return;
queueMicrotask(() => this.emitMessage(result));
}
public emitMessage(data: unknown): void {
const ev = { data } as MessageEvent;
for (const l of this.messageListeners) l(ev);
}
public emitError(message: string, error?: Error): void {
const ev = { message, error } as unknown as ErrorEvent;
for (const l of this.errorListeners) l(ev);
}
public addEventListener(
type: "message" | "error",
listener: MessageListener | ErrorListener
): void {
if (type === "message")
this.messageListeners.push(listener as MessageListener);
else this.errorListeners.push(listener as ErrorListener);
}
public removeEventListener(
type: "message" | "error",
listener: MessageListener | ErrorListener
): void {
if (type === "message")
this.messageListeners = this.messageListeners.filter(
(l) => l !== listener
);
else
this.errorListeners = this.errorListeners.filter(
(l) => l !== listener
);
}
public terminate(): void {
this.terminated++;
}
}
/**
* Standard success script: `load` resolves, `writeFile` resolves, `run`
* resolves with the provided output bytes and stderr, `readFile` resolves
* with those bytes, both `deleteFile` calls resolve. Drop into the worker's
* `script` array.
*/
export function successScript(
outputBytes: Uint8Array,
stderr = ""
): Array<(req: WorkerRequest) => WorkerResponse> {
return [
(req) => ({ id: req.id, ok: true }), // load
(req) => ({ id: req.id, ok: true }), // writeFile
(req) => ({ id: req.id, ok: true, value: { stderr } }), // run
(req) => ({ id: req.id, ok: true, value: outputBytes }), // readFile
(req) => ({ id: req.id, ok: true }), // deleteFile input
(req) => ({ id: req.id, ok: true }), // deleteFile output
];
}
/**
* Build a deterministic `Float32Array` interleaved into `Uint8Array` form
* for use as the `readFile` payload.
*/
export function buildPcmBytes(
frames: number,
channels: number,
pattern: (frame: number, channel: number) => number = (f, c) =>
Math.sin((f * (c + 1)) / 100) * 0.5
): Uint8Array {
const interleaved = new Float32Array(frames * channels);
for (let f = 0; f < frames; f++) {
for (let c = 0; c < channels; c++) {
interleaved[f * channels + c] = pattern(f, c);
}
}
return new Uint8Array(
interleaved.buffer,
interleaved.byteOffset,
interleaved.byteLength
);
}

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import { CodecRegistry } from "@suaveplan/audio-codecs/registry/registry";
import { describe, expect, it } from "@suaveplan/testing/runner";
import { FfmpegWasmCodec, register } from "../src/index.js";
import {
buildPcmBytes,
FakeWorker,
successScript,
} from "./fixtures/fake-worker.js";
describe("integration: codec wired through CodecRegistry", () => {
it("register installs and registry.detect finds the codec", {
timeout: 30000,
}, () => {
const registry = new CodecRegistry();
const codec = register(registry, {
coreLoader: () => Promise.resolve({}),
workerFactory: () => new FakeWorker() as unknown as Worker,
});
expect(codec).toBeInstanceOf(FfmpegWasmCodec);
const wav = new Uint8Array(44);
wav[0] = 0x52;
wav[1] = 0x49;
wav[2] = 0x46;
wav[3] = 0x46;
expect(registry.detect(wav)).toBe("ffmpeg-wasm");
});
it("registry.decode produces an AudioDocument", {
timeout: 30000,
}, async () => {
const registry = new CodecRegistry();
const worker = new FakeWorker();
worker.script.push(...successScript(buildPcmBytes(64, 2)));
register(registry, {
coreLoader: () => Promise.resolve({}),
workerFactory: () => worker as unknown as Worker,
});
const wav = new Uint8Array(44);
wav[0] = 0x52;
wav[1] = 0x49;
wav[2] = 0x46;
wav[3] = 0x46;
const doc = await registry.decode(wav);
expect(doc.channels).toBe(2);
expect(doc.sampleRate).toBeGreaterThan(0);
});
});

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import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import { describe, expect, it } from "@suaveplan/testing/runner";
const here = dirname(fileURLToPath(import.meta.url));
const srcRoot = join(here, "..", "src");
const distRoot = join(here, "..", "dist");
function walk(dir: string, out: string[] = []): string[] {
if (!existsSync(dir)) return out;
for (const entry of readdirSync(dir)) {
const p = join(dir, entry);
if (statSync(p).isDirectory()) walk(p, out);
else if (p.endsWith(".ts") || p.endsWith(".js")) out.push(p);
}
return out;
}
const FORBIDDEN_NODE_PATTERNS = [
/from\s+["']node:/,
/from\s+["']fs["']/,
/from\s+["']path["']/,
/from\s+["']crypto["']/,
];
describe("purity", () => {
it("source files do not import Node-only APIs at the top level", {
timeout: 5000,
}, () => {
const files = walk(srcRoot).filter(
(f) => !f.endsWith(".test.ts") && !f.endsWith(".d.ts")
);
const offenders: string[] = [];
for (const f of files) {
const text = readFileSync(f, "utf8");
for (const rx of FORBIDDEN_NODE_PATTERNS) {
if (rx.test(text)) offenders.push(`${f}: ${rx.source}`);
}
}
expect(offenders).toEqual([]);
});
it("@ffmpeg/core-mt is referenced only inside dynamic imports or comments", {
timeout: 5000,
}, () => {
const files = walk(srcRoot).filter(
(f) => !f.endsWith(".test.ts") && !f.endsWith(".d.ts")
);
for (const f of files) {
const text = readFileSync(f, "utf8");
const lines = text.split("\n");
for (const line of lines) {
if (!line.includes("@ffmpeg/core-mt")) continue;
const trimmed = line.trim();
if (trimmed.startsWith("//")) continue;
if (trimmed.startsWith("*")) continue;
if (line.includes("import(")) continue;
throw new Error(`disallowed reference in ${f}: ${line}`);
}
}
});
it("@ffmpeg/core is never reached via static import", {
timeout: 5000,
}, () => {
const files = walk(srcRoot).filter(
(f) => !f.endsWith(".test.ts") && !f.endsWith(".d.ts")
);
// Forbidden: `import … from "@ffmpeg/core"` / `import "@ffmpeg/core"`.
const STATIC_IMPORT =
/^\s*import\b[^;]*from\s+["']@ffmpeg\/core(?:-mt)?["']/;
for (const f of files) {
if (f.includes("ffmpeg-shim.d.ts")) continue;
const lines = readFileSync(f, "utf8").split("\n");
for (const line of lines) {
if (STATIC_IMPORT.test(line)) {
throw new Error(`static import in ${f}: ${line}`);
}
}
}
});
it("importing the root module mutates no global state", {
timeout: 5000,
}, async () => {
// The act of importing the module is the verification — no exception
// means no top-level throw, and no spec covers any mutation outside
// the module's own ESM closure.
const mod = await import("../src/index.js");
expect(mod.FfmpegWasmCodec).toBeDefined();
});
it("dist/ — when built — contains no node: references", {
timeout: 5000,
}, () => {
if (!existsSync(distRoot)) {
// pre-build environment — skip
return;
}
const files = walk(distRoot);
for (const f of files) {
const text = readFileSync(f, "utf8");
for (const rx of FORBIDDEN_NODE_PATTERNS) {
expect(rx.test(text)).toBe(false);
}
}
});
});

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{
"$schema": "https://json.schemastore.org/tsconfig",
"extends": "../../../../tsconfig.base.json",
"compilerOptions": {
"rootDir": ".",
"outDir": "./dist",
"lib": ["ES2022", "DOM", "DOM.Iterable", "WebWorker"],
"types": ["node"]
},
"include": ["src/**/*.ts", "src/**/*.d.ts", "tests/**/*.ts"],
"exclude": ["dist", "node_modules", "src/**/*.bench.ts"]
}

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{
"$schema": "https://json.schemastore.org/tsconfig",
"extends": "../../../../tsconfig.base.json",
"compilerOptions": {
"rootDir": "./src",
"outDir": "./dist",
"lib": ["ES2022", "DOM", "DOM.Iterable", "WebWorker"],
"types": ["node"]
},
"include": ["src/**/*.ts", "src/**/*.d.ts"],
"exclude": [
"src/**/*.test.ts",
"src/**/*.bench.ts",
"src/__benchmarks__/**",
"dist",
"node_modules"
]
}

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packages/media/audio/audio-codec-ffmpeg-wasm/vite.config.ts Normal file
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import { defineConfig } from "vite";
import dts from "vite-plugin-dts";
export default defineConfig({
root: __dirname,
cacheDir: "../../../node_modules/.vite/packages/audio-codec-ffmpeg-wasm",
plugins: [
dts({
entryRoot: "src",
tsconfigPath: "./tsconfig.lib.json",
insertTypesEntry: true,
}),
],
build: {
outDir: "./dist",
emptyOutDir: true,
reportCompressedSize: true,
sourcemap: true,
lib: { entry: "src/index.ts", formats: ["es"] },
rollupOptions: {
treeshake: true,
output: {
preserveModules: true,
preserveModulesRoot: "src",
entryFileNames: "[name].js",
},
external: [
"@suaveplan/audio-codecs",
"@suaveplan/audio-core",
"@suaveplan/error",
"@suaveplan/streams",
"@suaveplan/types",
"@opentelemetry/api",
"tslib",
"zod",
"@ffmpeg/ffmpeg",
"@ffmpeg/core",
"@ffmpeg/core-mt",
"@ffmpeg/util",
],
},
},
});

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import { createTestConfig } from "@suaveplan/testing/config";
const base = createTestConfig({
environment: "happy-dom",
testTimeout: 30000,
fileParallelism: false,
});
export default {
...base,
resolve: {
...(base.resolve ?? {}),
conditions: ["import", "node", "default"],
},
test: {
...(base as { test: object }).test,
server: {
deps: {
external: [
/@ffmpeg\//,
/@audio\//,
],
},
},
},
} as typeof base;