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// Browser recorder (B-05): getUserMedia, AudioWorklet with ScriptProcessor fallback, 16 kHz mono
// PCM16, WAV export, 640-byte frames that can stream straight into a YuguStreamSession.
import { encodeWav, encodeWavBytes, floatToInt16 } from './audio.js';
import { localError, YuguError } from './errors.js';
import { getGlobal } from './util.js';
/** Recorder states. */
export const RecorderState = Object.freeze({
IDLE: 'IDLE',
RECORDING: 'RECORDING',
PAUSED: 'PAUSED',
STOPPED: 'STOPPED',
RELEASED: 'RELEASED',
});
const R = RecorderState;
const PROCESSOR_NAME = 'yugu-pcm-processor';
const RESUME_WAIT_MS = 300;
/** Source of the AudioWorklet processor (also shipped as dist/yugu-pcm-worklet.js). */
export const PCM_WORKLET_SOURCE = `class YuguPcmProcessor extends AudioWorkletProcessor {
constructor() {
super();
this._buf = new Float32Array(1024);
this._n = 0;
this.port.onmessage = (e) => {
if (e.data === 'flush') {
this._flush();
this.port.postMessage('flushed');
}
};
}
_flush() {
if (this._n > 0) {
const out = this._buf.slice(0, this._n);
this._n = 0;
this.port.postMessage(out, [out.buffer]);
}
}
process(inputs) {
const input = inputs[0];
if (input && input.length) {
const chs = input.length;
const len = input[0].length;
for (let i = 0; i < len; i++) {
let s = 0;
for (let c = 0; c < chs; c++) s += input[c][i];
this._buf[this._n++] = s / chs;
if (this._n === this._buf.length) this._flush();
}
}
return true;
}
}
registerProcessor('${PROCESSOR_NAME}', YuguPcmProcessor);
`;
let workletUrlCache = null;
/**
* Streaming resampler: box low-pass (when downsampling by 2 or more) plus linear interpolation,
* continuous across chunks.
*/
export class StreamResampler {
constructor(inRate, outRate) {
this.ratio = inRate / outRate;
this.pos = 1;
this.prev = 0;
this.width = this.ratio >= 2 ? Math.floor(this.ratio) : 1;
this.hist = new Float32Array(Math.max(0, this.width - 1));
}
process(input) {
if (this.ratio === 1) return Float32Array.from(input);
const x = this.width > 1 ? this._lowpass(input) : input;
const n = x.length;
if (n === 0) return new Float32Array(0);
const out = [];
let t = this.pos;
while (t < n) {
const i = Math.floor(t);
const frac = t - i;
const a = i === 0 ? this.prev : x[i - 1];
const b = x[i];
out.push(a + (b - a) * frac);
t += this.ratio;
}
this.pos = t - n;
this.prev = x[n - 1];
return Float32Array.from(out);
}
_lowpass(input) {
const w = this.width;
const h = this.hist;
const out = new Float32Array(input.length);
for (let k = 0; k < input.length; k++) {
let s = input[k];
for (let j = 1; j < w; j++) {
const idx = k - j;
s += idx >= 0 ? input[idx] : h[h.length + idx];
}
out[k] = s / w;
}
const keep = w - 1;
if (keep > 0) {
const merged = new Float32Array(h.length + input.length);
merged.set(h, 0);
merged.set(input, h.length);
this.hist = merged.slice(merged.length - keep);
}
return out;
}
}
function mapMediaError(e) {
const name = e && e.name;
const detail = e && e.message ? e.message : String(e);
if (name === 'NotAllowedError' || name === 'SecurityError' || name === 'PermissionDeniedError') {
return localError(90201, detail, { cause: e });
}
if (
name === 'NotFoundError' ||
name === 'DevicesNotFoundError' ||
name === 'NotReadableError' ||
name === 'TrackStartError' ||
name === 'OverconstrainedError' ||
name === 'AbortError'
) {
return localError(90202, detail, { cause: e });
}
return localError(90203, detail, { cause: e });
}
/**
* Resume an AudioContext without blocking: without a user gesture the resume() promise stays
* pending until one happens (autoplay policy). Audio flows as soon as the context runs.
*/
async function resumeContext(ctx) {
if (!ctx || typeof ctx.resume !== 'function') return;
let timer = null;
await Promise.race([
Promise.resolve()
.then(() => ctx.resume())
.catch(() => undefined),
new Promise((r) => {
timer = setTimeout(r, RESUME_WAIT_MS);
}),
]);
clearTimeout(timer);
}
function stopTracks(stream) {
if (!stream || typeof stream.getTracks !== 'function') return;
for (const t of stream.getTracks()) {
try {
t.stop();
} catch (_) {
/* ignore */
}
}
}
/**
* Microphone recorder producing 16 kHz, 16-bit, mono PCM.
*/
export class YuguRecorder {
constructor(options) {
const o = options == null ? {} : options;
if (typeof o !== 'object') throw localError(90010, 'YuguRecorder 选项必须是对象');
this._targetRate = o.targetSampleRate == null ? 16000 : o.targetSampleRate;
if (!Number.isInteger(this._targetRate) || this._targetRate < 8000 || this._targetRate > 48000) {
throw localError(90010, 'targetSampleRate 必须是 8000 到 48000 之间的整数');
}
this._frameBytes = o.frameBytes == null ? 640 : o.frameBytes;
if (!Number.isInteger(this._frameBytes) || this._frameBytes < 2 || this._frameBytes % 2 !== 0) {
throw localError(90010, 'frameBytes 必须是正偶数');
}
this._constraints = o.constraints || {
audio: { channelCount: 1, echoCancellation: true, noiseSuppression: true, autoGainControl: true },
};
this._useWorklet = o.useAudioWorklet !== false;
this._workletUrl = typeof o.workletModuleUrl === 'string' && o.workletModuleUrl ? o.workletModuleUrl : null;
this._envOverride = o.environment || null;
this._listener =
o.listener !== undefined
? o.listener
: { onFrame: o.onFrame, onLevel: o.onLevel, onError: o.onError, onStateChanged: o.onStateChanged };
this._state = R.IDLE;
this._starting = null;
this._releasePromise = null;
this._stream = null;
this._ctx = null;
this._source = null;
this._node = null;
this._sink = null;
this._usingWorklet = false;
this._session = null;
this._chunks = [];
this._samples = 0;
this._frame = new Int16Array(this._frameBytes / 2);
this._frameFill = 0;
this._resampler = null;
this._flushResolve = null;
this._onTrackEnded = () => this._trackEnded();
}
/** True when getUserMedia and AudioContext exist (secure context required in browsers). */
static isSupported() {
const env = defaultEnvironment();
return !!(env.mediaDevices && typeof env.mediaDevices.getUserMedia === 'function' && env.AudioContext);
}
/** IDLE, RECORDING, PAUSED, STOPPED or RELEASED. */
getState() {
return this._state;
}
/** Replace or remove (null) the listener {onStateChanged, onFrame, onLevel, onError}. */
setListener(listener) {
if (listener !== null && typeof listener !== 'object') throw localError(90010, 'listener 必须是对象或 null');
if (this._state === R.RELEASED) return;
this._listener = listener;
}
/** True when the AudioWorklet path is in use, false for ScriptProcessor. */
isUsingAudioWorklet() {
return this._usingWorklet;
}
/** Recorded duration in milliseconds. */
getDurationMs() {
return (this._samples / this._targetRate) * 1000;
}
/**
* Start recording. Must follow a user gesture in browsers.
* options.session: a YuguStreamSession that receives every 640-byte frame through sendAudio.
*/
start(options) {
if (this._state === R.RELEASED) return Promise.reject(localError(90009, '录音器已释放'));
if (this._state === R.RECORDING) return Promise.resolve();
if (this._state === R.PAUSED) return Promise.reject(localError(90009, '录音器已暂停，请调用 resume()'));
if (this._starting) return this._starting;
const session = options && options.session ? options.session : null;
if (session && typeof session.sendAudio !== 'function') {
return Promise.reject(localError(90010, 'session 必须是 YuguStreamSession'));
}
this._starting = this._doStart(session).finally(() => {
this._starting = null;
});
return this._starting;
}
/** Pause: frames are discarded until resume(). The microphone stays open. */
async pause() {
if (this._state === R.PAUSED) return;
if (this._state !== R.RECORDING) throw localError(90009, `${this._state} 状态不能暂停`);
this._setState(R.PAUSED);
try {
if (this._ctx && typeof this._ctx.suspend === 'function') await this._ctx.suspend();
} catch (_) {
/* frames are dropped by state anyway */
}
}
/** Resume after pause(). */
async resume() {
if (this._state === R.RECORDING) return;
if (this._state !== R.PAUSED) throw localError(90009, `${this._state} 状态不能恢复`);
if (this._ctx) await resumeContext(this._ctx);
if (this._state === R.PAUSED) this._setState(R.RECORDING);
}
/**
* Stop: flushes the last partial frame (zero padded to 640 bytes), releases the microphone and
* the AudioContext. Recorded audio stays available for exportWav(). No-op when not recording.
*/
async stop() {
if (this._starting) {
try {
await this._starting;
} catch (_) {
return;
}
}
if (this._state !== R.RECORDING && this._state !== R.PAUSED) return;
if (this._state === R.RECORDING) await this._flushWorklet();
if (this._frameFill > 0 && this._state === R.RECORDING) {
this._frame.fill(0, this._frameFill);
this._frameFill = this._frame.length;
this._deliverFrame();
}
this._frameFill = 0;
await this._teardown();
if (this._state === R.RECORDING || this._state === R.PAUSED) this._setState(R.STOPPED);
}
/** stop() then exportWav(). */
async stopAndGetWav() {
await this.stop();
return this.exportWav();
}
/** Recorded audio as a 16 kHz mono 16-bit WAV Blob. */
exportWav() {
return encodeWav(this._pcm(), this._targetRate, 1);
}
/** Recorded audio as WAV bytes. */
exportWavBytes() {
return encodeWavBytes(this._pcm(), this._targetRate, 1);
}
/**
* Release everything: stops the microphone tracks, closes the AudioContext, drops the recorded
* audio and the listener. Idempotent, never throws.
*/
release() {
if (this._releasePromise) return this._releasePromise;
this._setState(R.RELEASED);
this._listener = null;
this._session = null;
this._releasePromise = this._teardown()
.catch(() => undefined)
.then(() => {
this._chunks = [];
this._samples = 0;
this._frameFill = 0;
});
return this._releasePromise;
}
// ------------------------------------------------------------------ internal
_env() {
const d = defaultEnvironment();
const o = this._envOverride || {};
return {
mediaDevices: o.mediaDevices || d.mediaDevices,
AudioContext: o.AudioContext || d.AudioContext,
AudioWorkletNode: o.AudioWorkletNode || d.AudioWorkletNode,
createObjectURL: o.createObjectURL || d.createObjectURL,
};
}
async _doStart(session) {
const env = this._env();
if (!env.mediaDevices || typeof env.mediaDevices.getUserMedia !== 'function' || !env.AudioContext) {
throw localError(90202, '当前环境不支持录音，需要 https 或 localhost 安全上下文，以及 getUserMedia 与 AudioContext');
}
let stream;
try {
stream = await env.mediaDevices.getUserMedia(this._constraints);
} catch (e) {
throw mapMediaError(e);
}
if (this._state === R.RELEASED) {
stopTracks(stream);
throw localError(90009, '录音器已释放');
}
this._stream = stream;
try {
const ctx = new env.AudioContext();
this._ctx = ctx;
if (ctx.state === 'suspended') await resumeContext(ctx);
this._source = ctx.createMediaStreamSource(stream);
this._resampler = new StreamResampler(ctx.sampleRate, this._targetRate);
this._chunks = [];
this._samples = 0;
this._frameFill = 0;
const ok = this._useWorklet && (await this._initWorklet(env));
if (!ok) this._initScriptProcessor();
} catch (e) {
await this._teardown();
throw e instanceof YuguError ? e : localError(90203, `录音初始化失败：${e && e.message}`, { cause: e });
}
if (this._state === R.RELEASED) {
await this._teardown();
throw localError(90009, '录音器已释放');
}
for (const t of typeof stream.getTracks === 'function' ? stream.getTracks() : []) {
if (typeof t.addEventListener === 'function') t.addEventListener('ended', this._onTrackEnded);
}
this._session = session;
this._setState(R.RECORDING);
}
async _initWorklet(env) {
const ctx = this._ctx;
if (!ctx.audioWorklet || typeof ctx.audioWorklet.addModule !== 'function' || !env.AudioWorkletNode) return false;
try {
let url = this._workletUrl;
if (!url) {
if (!workletUrlCache) {
workletUrlCache = env.createObjectURL(new Blob([PCM_WORKLET_SOURCE], { type: 'application/javascript' }));
}
url = workletUrlCache;
}
await ctx.audioWorklet.addModule(url);
const node = new env.AudioWorkletNode(ctx, PROCESSOR_NAME, {
numberOfInputs: 1,
numberOfOutputs: 1,
channelCount: 1,
});
node.port.onmessage = (ev) => this._onWorkletMessage(ev.data);
this._source.connect(node);
this._connectSink(node);
this._node = node;
this._usingWorklet = true;
return true;
} catch (_) {
this._node = null;
this._usingWorklet = false;
return false;
}
}
_initScriptProcessor() {
const ctx = this._ctx;
const node = ctx.createScriptProcessor(4096, 1, 1);
node.onaudioprocess = (ev) => {
const input = ev.inputBuffer.getChannelData(0);
this._onPcm(new Float32Array(input));
};
this._source.connect(node);
this._connectSink(node);
this._node = node;
this._usingWorklet = false;
}
_connectSink(node) {
// Keep the graph pulled without making a sound.
const sink = this._ctx.createGain();
sink.gain.value = 0;
node.connect(sink);
sink.connect(this._ctx.destination);
this._sink = sink;
}
_onWorkletMessage(data) {
if (data === 'flushed') {
if (this._flushResolve) this._flushResolve();
return;
}
this._onPcm(data);
}
_flushWorklet() {
const node = this._node;
if (!this._usingWorklet || !node || !node.port) return Promise.resolve();
return new Promise((resolve) => {
const timer = setTimeout(done, 100);
const self = this;
function done() {
clearTimeout(timer);
self._flushResolve = null;
resolve();
}
this._flushResolve = done;
try {
node.port.postMessage('flush');
} catch (_) {
done();
}
});
}
_onPcm(float32) {
if (this._state !== R.RECORDING || !float32 || !float32.length) return;
try {
let sum = 0;
for (let i = 0; i < float32.length; i++) sum += float32[i] * float32[i];
this._call('onLevel', [Math.sqrt(sum / float32.length)]);
const i16 = floatToInt16(this._resampler.process(float32));
if (!i16.length) return;
this._chunks.push(i16);
this._samples += i16.length;
let off = 0;
while (off < i16.length) {
const n = Math.min(this._frame.length - this._frameFill, i16.length - off);
this._frame.set(i16.subarray(off, off + n), this._frameFill);
this._frameFill += n;
off += n;
if (this._frameFill === this._frame.length) this._deliverFrame();
}
} catch (e) {
this._fault(localError(90203, `录音数据处理失败：${e && e.message}`, { cause: e }));
}
}
_deliverFrame() {
const bytes = new Uint8Array(this._frame.buffer.slice(0, this._frameBytes));
this._frameFill = 0;
this._call('onFrame', [bytes]);
if (this._session) {
try {
this._session.sendAudio(bytes);
} catch (_) {
/* the session reports its own errors */
}
}
}
_trackEnded() {
if (this._state !== R.RECORDING && this._state !== R.PAUSED) return;
this._fault(localError(90202, '麦克风已断开或被其他程序占用'));
}
_fault(err) {
this._teardown().catch(() => undefined);
if (this._state === R.RECORDING || this._state === R.PAUSED) this._setState(R.STOPPED);
this._call('onError', [err]);
}
async _teardown() {
const node = this._node;
const source = this._source;
const sink = this._sink;
const stream = this._stream;
const ctx = this._ctx;
this._node = null;
this._source = null;
this._sink = null;
this._stream = null;
this._ctx = null;
this._usingWorklet = false;
if (this._flushResolve) this._flushResolve();
for (const n of [source, node, sink]) {
if (!n) continue;
try {
n.disconnect();
} catch (_) {
/* ignore */
}
}
if (node) {
try {
if (node.port) node.port.onmessage = null;
if ('onaudioprocess' in node) node.onaudioprocess = null;
} catch (_) {
/* ignore */
}
}
if (stream) {
for (const t of typeof stream.getTracks === 'function' ? stream.getTracks() : []) {
if (typeof t.removeEventListener === 'function') t.removeEventListener('ended', this._onTrackEnded);
}
stopTracks(stream);
}
if (ctx && ctx.state !== 'closed' && typeof ctx.close === 'function') {
try {
await ctx.close();
} catch (_) {
/* ignore */
}
}
}
_pcm() {
const out = new Int16Array(this._samples);
let o = 0;
for (const c of this._chunks) {
out.set(c, o);
o += c.length;
}
return out;
}
_setState(next) {
const prev = this._state;
if (prev === next) return;
this._state = next;
this._call('onStateChanged', [prev, next]);
}
_call(name, args) {
const l = this._listener;
if (!l) return;
const fn = l[name];
if (typeof fn !== 'function') return;
try {
fn.apply(l, args);
} catch (_) {
/* listener errors never break recording */
}
}
}
function defaultEnvironment() {
const g = getGlobal();
const nav = g.navigator;
return {
mediaDevices: nav && nav.mediaDevices ? nav.mediaDevices : null,
AudioContext: g.AudioContext || g.webkitAudioContext || null,
AudioWorkletNode: g.AudioWorkletNode || null,
createObjectURL: g.URL && typeof g.URL.createObjectURL === 'function' ? (b) => g.URL.createObjectURL(b) : null,
};
}
|