refactor: AbstractAudioContextAdapter
move duplicate code from WavAdapter and FlacAdapter to a base class
This commit is contained in:
Radium Zheng
parent
1e804e552e
commit
df6df1c6c3
react/features/local-recording/recording
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@ -0,0 +1,129 @@
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import { RecordingAdapter } from './RecordingAdapter';
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const logger = require('jitsi-meet-logger').getLogger(__filename);
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/**
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* Base class for {@code AudioContext}-based recording adapters.
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*/
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export class AbstractAudioContextAdapter extends RecordingAdapter {
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/**
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* The {@code AudioContext} instance.
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*/
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_audioContext = null;
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/**
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* The {@code ScriptProcessorNode} instance.
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*/
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_audioProcessingNode = null;
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/**
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* The {@code MediaStreamAudioSourceNode} instance.
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*/
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_audioSource = null;
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/**
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* The {@code MediaStream} instance, representing the current audio device.
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*/
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_stream = null;
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/**
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* Sample rate.
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*/
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_sampleRate = 44100;
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/**
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* Constructor.
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*/
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constructor() {
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super();
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// sampleRate is browser and OS dependent.
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// Setting sampleRate explicitly is in the specs but not implemented
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// by browsers.
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// See: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/
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// AudioContext#Browser_compatibility
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// And https://bugs.chromium.org/p/chromium/issues/detail?id=432248
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this._audioContext = new AudioContext();
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this._sampleRate = this._audioContext.sampleRate;
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logger.log(`Current sampleRate ${this._sampleRate}.`);
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}
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/**
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* Sets up the audio graph in the AudioContext.
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*
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* @protected
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* @param {string} micDeviceId - The current microphone device ID.
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* @param {Function} callback - Callback function to
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* handle AudioProcessingEvents.
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* @returns {Promise}
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*/
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_initializeAudioContext(micDeviceId, callback) {
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if (typeof callback !== 'function') {
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return Promise.reject('a callback function is required.');
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}
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return this._getAudioStream(micDeviceId)
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.then(stream => {
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this._stream = stream;
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this._audioSource
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= this._audioContext.createMediaStreamSource(stream);
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this._audioProcessingNode
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= this._audioContext.createScriptProcessor(4096, 1, 1);
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this._audioProcessingNode.onaudioprocess = callback;
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logger.debug('AudioContext is set up.');
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})
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.catch(err => {
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logger.error(`Error calling getUserMedia(): ${err}`);
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return Promise.reject(err);
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});
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}
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/**
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* Connects the nodes in the {@code AudioContext} to start the flow of
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* audio data.
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*
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* @protected
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* @returns {void}
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*/
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_connectAudioGraph() {
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this._audioSource.connect(this._audioProcessingNode);
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this._audioProcessingNode.connect(this._audioContext.destination);
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}
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/**
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* Disconnects the nodes in the {@code AudioContext}.
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*
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* @protected
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* @returns {void}
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*/
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_disconnectAudioGraph() {
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this._audioProcessingNode.onaudioprocess = undefined;
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this._audioProcessingNode.disconnect();
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this._audioSource.disconnect();
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}
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/**
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* Replaces the current microphone MediaStream.
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*
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* @protected
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* @param {string} micDeviceId - New microphone ID.
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* @returns {Promise}
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*/
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_replaceMic(micDeviceId) {
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if (this._audioContext && this._audioProcessingNode) {
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return this._getAudioStream(micDeviceId).then(newStream => {
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const newSource = this._audioContext
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.createMediaStreamSource(newStream);
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this._audioSource.disconnect();
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newSource.connect(this._audioProcessingNode);
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this._stream = newStream;
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this._audioSource = newSource;
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});
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}
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return Promise.resolve();
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}
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}
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@ -1,34 +1,13 @@
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import { RecordingAdapter } from './RecordingAdapter';
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import { AbstractAudioContextAdapter } from './AbstractAudioContextAdapter';
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const logger = require('jitsi-meet-logger').getLogger(__filename);
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const WAV_BITS_PER_SAMPLE = 16;
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const WAV_SAMPLE_RATE = 44100;
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/**
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* Recording adapter for raw WAVE format.
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*/
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export class WavAdapter extends RecordingAdapter {
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/**
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* The current {@code MediaStream} instance.
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*/
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_stream = null;
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/**
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* {@code AudioContext} instance.
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*/
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_audioContext = null;
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/**
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* {@code ScriptProcessorNode} instance, which receives the raw PCM bits.
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*/
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_audioProcessingNode = null;
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/**
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* {@code MediaStreamAudioSourceNode} instance, which represents the mic.
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*/
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_audioSource = null;
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export class WavAdapter extends AbstractAudioContextAdapter {
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/**
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* Length of the WAVE file, in number of samples.
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@ -55,8 +34,7 @@ export class WavAdapter extends RecordingAdapter {
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*/
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constructor() {
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super();
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this._onReceivePCM = this._onReceivePCM.bind(this);
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this._onAudioProcess = this._onAudioProcess.bind(this);
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}
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/**
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@ -73,9 +51,7 @@ export class WavAdapter extends RecordingAdapter {
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this._wavBuffers = [];
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this._wavLength = 0;
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this._audioSource.connect(this._audioProcessingNode);
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this._audioProcessingNode
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.connect(this._audioContext.destination);
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this._connectAudioGraph();
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});
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}
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@ -85,10 +61,8 @@ export class WavAdapter extends RecordingAdapter {
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* @inheritdoc
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*/
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stop() {
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this._audioProcessingNode.disconnect();
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this._audioSource.disconnect();
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this._disconnectAudioGraph();
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this._data = this._exportMonoWAV(this._wavBuffers, this._wavLength);
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this._audioContext = null;
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this._audioProcessingNode = null;
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this._audioSource = null;
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this._isInitialized = false;
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@ -149,34 +123,6 @@ export class WavAdapter extends RecordingAdapter {
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return this._replaceMic(micDeviceId);
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}
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/**
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* Replaces the current microphone MediaStream.
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*
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* @param {*} micDeviceId - New microphone ID.
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* @returns {Promise}
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*/
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_replaceMic(micDeviceId) {
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if (this._audioContext && this._audioProcessingNode) {
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return new Promise((resolve, reject) => {
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this._getAudioStream(micDeviceId).then(newStream => {
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const newSource = this._audioContext
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.createMediaStreamSource(newStream);
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this._audioSource.disconnect();
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newSource.connect(this._audioProcessingNode);
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this._stream = newStream;
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this._audioSource = newSource;
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resolve();
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})
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.catch(() => {
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reject();
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});
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});
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}
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return Promise.resolve();
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}
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/**
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* Creates a WAVE file header.
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*
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@ -209,11 +155,11 @@ export class WavAdapter extends RecordingAdapter {
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view.setUint16(22, 1, true);
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// SampleRate
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view.setUint32(24, WAV_SAMPLE_RATE, true);
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view.setUint32(24, this._sampleRate, true);
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// ByteRate
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view.setUint32(28,
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Number(WAV_SAMPLE_RATE) * 1 * WAV_BITS_PER_SAMPLE / 8, true);
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Number(this._sampleRate) * 1 * WAV_BITS_PER_SAMPLE / 8, true);
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// BlockAlign
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view.setUint16(32, 1 * Number(WAV_BITS_PER_SAMPLE) / 8, true);
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@ -244,51 +190,31 @@ export class WavAdapter extends RecordingAdapter {
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return Promise.resolve();
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}
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const p = new Promise((resolve, reject) => {
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this._getAudioStream(micDeviceId)
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.then(stream => {
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this._stream = stream;
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this._audioContext = new AudioContext({
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sampleRate: WAV_SAMPLE_RATE
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});
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this._audioSource
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= this._audioContext.createMediaStreamSource(stream);
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this._audioProcessingNode
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= this._audioContext.createScriptProcessor(4096, 1, 1);
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this._audioProcessingNode.onaudioprocess = e => {
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const channelLeft = e.inputBuffer.getChannelData(0);
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// See: https://developer.mozilla.org/en-US/docs/Web/API/
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// AudioBuffer/getChannelData
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// The returned value is an Float32Array.
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this._onReceivePCM(channelLeft);
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};
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return this._initializeAudioContext(micDeviceId, this._onAudioProcess)
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.then(() => {
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this._isInitialized = true;
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resolve();
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})
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.catch(err => {
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logger.error(`Error calling getUserMedia(): ${err}`);
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reject();
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});
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});
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return p;
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}
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/**
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* Callback function that saves the PCM bits.
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* Callback function for handling AudioProcessingEvents.
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*
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* @private
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* @param {Float32Array} data - The audio PCM data.
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* @param {AudioProcessingEvent} e - The event containing the raw PCM.
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* @returns {void}
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*/
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_onReceivePCM(data) {
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_onAudioProcess(e) {
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// See: https://developer.mozilla.org/en-US/docs/Web/API/
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// AudioBuffer/getChannelData
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// The returned value is an Float32Array.
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const channelLeft = e.inputBuffer.getChannelData(0);
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// Need to copy the Float32Array:
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// unlike passing to WebWorker, this data is passed by reference,
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// so we need to copy it, otherwise the resulting audio file will be
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// just repeating the last segment.
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this._wavBuffers.push(new Float32Array(data));
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this._wavLength += data.length;
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this._wavBuffers.push(new Float32Array(channelLeft));
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this._wavLength += channelLeft.length;
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}
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/**
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@ -1,4 +1,3 @@
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import { RecordingAdapter } from '../RecordingAdapter';
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import {
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DEBUG,
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MAIN_THREAD_FINISH,
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@ -8,50 +7,41 @@ import {
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WORKER_LIBFLAC_READY
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} from './messageTypes';
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import { AbstractAudioContextAdapter } from '../AbstractAudioContextAdapter';
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const logger = require('jitsi-meet-logger').getLogger(__filename);
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/**
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* Recording adapter that uses libflac.js in the background.
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*/
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export class FlacAdapter extends RecordingAdapter {
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export class FlacAdapter extends AbstractAudioContextAdapter {
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/**
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* Instance of flacEncodeWorker.
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*/
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_encoder = null;
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/**
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* The {@code AudioContext} instance.
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*/
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_audioContext = null;
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/**
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* The {@code ScriptProcessorNode} instance.
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*/
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_audioProcessingNode = null;
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/**
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* The {@code MediaStreamAudioSourceNode} instance.
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*/
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_audioSource = null;
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/**
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* The {@code MediaStream} instance, representing the current audio device.
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*/
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_stream = null;
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/**
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* Resolve function of the promise returned by {@code stop()}.
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* This is called after the WebWorker sends back {@code WORKER_BLOB_READY}.
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*/
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_stopPromiseResolver = null;
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_initPromiseResolver = null;
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/**
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* Initialization promise.
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*/
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_initPromise = null;
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_sampleRate = 44100;
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/**
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* Constructor.
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*/
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constructor() {
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super();
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this._onAudioProcess = this._onAudioProcess.bind(this);
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this._onWorkerMessage = this._onWorkerMessage.bind(this);
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}
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/**
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* Implements {@link RecordingAdapter#start()}.
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@ -64,8 +54,7 @@ export class FlacAdapter extends RecordingAdapter {
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}
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return this._initPromise.then(() => {
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this._audioSource.connect(this._audioProcessingNode);
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this._audioProcessingNode.connect(this._audioContext.destination);
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this._connectAudioGraph();
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});
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}
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@ -83,9 +72,7 @@ export class FlacAdapter extends RecordingAdapter {
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return new Promise(resolve => {
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this._initPromise = null;
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this._audioProcessingNode.onaudioprocess = undefined;
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this._audioProcessingNode.disconnect();
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this._audioSource.disconnect();
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this._disconnectAudioGraph();
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this._stopPromiseResolver = resolve;
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this._encoder.postMessage({
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command: MAIN_THREAD_FINISH
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@ -146,29 +133,6 @@ export class FlacAdapter extends RecordingAdapter {
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return this._replaceMic(micDeviceId);
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}
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/**
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* Replaces the current microphone MediaStream.
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*
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* @param {string} micDeviceId - New microphone ID.
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* @returns {Promise}
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*/
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_replaceMic(micDeviceId) {
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if (this._audioContext && this._audioProcessingNode) {
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return this._getAudioStream(micDeviceId).then(newStream => {
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const newSource = this._audioContext
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.createMediaStreamSource(newStream);
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this._audioSource.disconnect();
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newSource.connect(this._audioProcessingNode);
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this._stream = newStream;
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this._audioSource = newSource;
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});
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}
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return Promise.resolve();
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}
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/**
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* Initialize the adapter.
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*
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@ -181,17 +145,6 @@ export class FlacAdapter extends RecordingAdapter {
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return Promise.resolve();
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}
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// sampleRate is browser and OS dependent.
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// Setting sampleRate explicitly is in the specs but not implemented
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// by browsers.
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// See: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/
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// AudioContext#Browser_compatibility
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// And https://bugs.chromium.org/p/chromium/issues/detail?id=432248
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this._audioContext = new AudioContext();
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this._sampleRate = this._audioContext.sampleRate;
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logger.log(`Current sampleRate ${this._sampleRate}.`);
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const promiseInitWorker = new Promise((resolve, reject) => {
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try {
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this._loadWebWorker();
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@ -199,28 +152,11 @@ export class FlacAdapter extends RecordingAdapter {
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reject();
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}
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// set up listen for messages from the WebWorker
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this._encoder.onmessage = e => {
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if (e.data.command === WORKER_BLOB_READY) {
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// Received a Blob representing an encoded FLAC file.
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this._data = e.data.buf;
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if (this._stopPromiseResolver !== null) {
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this._stopPromiseResolver();
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this._stopPromiseResolver = null;
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this._encoder.terminate();
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this._encoder = null;
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}
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} else if (e.data.command === DEBUG) {
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logger.log(e.data);
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} else if (e.data.command === WORKER_LIBFLAC_READY) {
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logger.log('libflac is ready.');
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resolve();
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} else {
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logger.error(
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`Unknown event
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from encoder (WebWorker): "${e.data.command}"!`);
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}
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};
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// save the Promise's resolver to resolve it later.
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this._initPromiseResolver = resolve;
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// set up listener for messages from the WebWorker
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this._encoder.onmessage = this._onWorkerMessage;
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this._encoder.postMessage({
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command: MAIN_THREAD_INIT,
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@ -231,38 +167,67 @@ export class FlacAdapter extends RecordingAdapter {
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});
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});
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const callbackInitAudioContext = () =>
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this._getAudioStream(micDeviceId)
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.then(stream => {
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this._stream = stream;
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this._audioSource
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= this._audioContext.createMediaStreamSource(stream);
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this._audioProcessingNode
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= this._audioContext.createScriptProcessor(4096, 1, 1);
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this._audioProcessingNode.onaudioprocess = e => {
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// Delegates to the WebWorker to do the encoding.
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// The return of getChannelData() is a Float32Array,
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// each element representing one sample.
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const channelLeft = e.inputBuffer.getChannelData(0);
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this._encoder.postMessage({
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command: MAIN_THREAD_NEW_DATA_ARRIVED,
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buf: channelLeft
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});
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};
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logger.debug('AudioContext is set up.');
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})
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.catch(err => {
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logger.error(`Error calling getUserMedia(): ${err}`);
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return Promise.reject(err);
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});
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// Because Promise constructor immediately executes the executor
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// function. This is undesirable, we want callbackInitAudioContext to be
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// executed only **after** promiseInitWorker is resolved.
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// Arrow function is used here because we want AudioContext to be
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// initialized only **after** promiseInitWorker is resolved.
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||||
return promiseInitWorker
|
||||
.then(callbackInitAudioContext);
|
||||
.then(() =>
|
||||
this._initializeAudioContext(
|
||||
micDeviceId,
|
||||
this._onAudioProcess
|
||||
));
|
||||
}
|
||||
|
||||
/**
|
||||
* Callback function for handling AudioProcessingEvents.
|
||||
*
|
||||
* @private
|
||||
* @param {AudioProcessingEvent} e - The event containing the raw PCM.
|
||||
* @returns {void}
|
||||
*/
|
||||
_onAudioProcess(e) {
|
||||
// Delegates to the WebWorker to do the encoding.
|
||||
// The return of getChannelData() is a Float32Array,
|
||||
// each element representing one sample.
|
||||
const channelLeft = e.inputBuffer.getChannelData(0);
|
||||
|
||||
this._encoder.postMessage({
|
||||
command: MAIN_THREAD_NEW_DATA_ARRIVED,
|
||||
buf: channelLeft
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Handler for messages from flacEncodeWorker.
|
||||
*
|
||||
* @private
|
||||
* @param {MessageEvent} e - The event sent by the WebWorker.
|
||||
* @returns {void}
|
||||
*/
|
||||
_onWorkerMessage(e) {
|
||||
switch (e.data.command) {
|
||||
case WORKER_BLOB_READY:
|
||||
// Received a Blob representing an encoded FLAC file.
|
||||
this._data = e.data.buf;
|
||||
if (this._stopPromiseResolver !== null) {
|
||||
this._stopPromiseResolver();
|
||||
this._stopPromiseResolver = null;
|
||||
this._encoder.terminate();
|
||||
this._encoder = null;
|
||||
}
|
||||
break;
|
||||
case DEBUG:
|
||||
logger.log(e.data);
|
||||
break;
|
||||
case WORKER_LIBFLAC_READY:
|
||||
logger.log('libflac is ready.');
|
||||
this._initPromiseResolver();
|
||||
break;
|
||||
default:
|
||||
logger.error(
|
||||
`Unknown event
|
||||
from encoder (WebWorker): "${e.data.command}"!`);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -6,6 +6,8 @@ import {
|
|||
WORKER_LIBFLAC_READY
|
||||
} from './messageTypes';
|
||||
|
||||
const logger = require('jitsi-meet-logger').getLogger(__filename);
|
||||
|
||||
/**
|
||||
* WebWorker that does FLAC encoding using libflac.js
|
||||
*/
|
||||
|
|
@ -261,7 +263,7 @@ class Encoder {
|
|||
const errorNo
|
||||
= Flac.FLAC__stream_encoder_get_state(this._encoderId);
|
||||
|
||||
console.error('Error during encoding', FLAC_ERRORS[errorNo]);
|
||||
logger.error('Error during encoding', FLAC_ERRORS[errorNo]);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -276,7 +278,7 @@ class Encoder {
|
|||
|
||||
const status = Flac.FLAC__stream_encoder_finish(this._encoderId);
|
||||
|
||||
console.log('flac encoding finish: ', status);
|
||||
logger.log('Flac encoding finished: ', status);
|
||||
|
||||
// free up resources
|
||||
Flac.FLAC__stream_encoder_delete(this._encoderId);
|
||||
|
|
@ -370,9 +372,8 @@ self.onmessage = function(e) {
|
|||
|
||||
case MAIN_THREAD_NEW_DATA_ARRIVED:
|
||||
if (encoder === null) {
|
||||
console
|
||||
.error('flacEncoderWorker:'
|
||||
+ 'received data when the encoder is not ready.');
|
||||
logger.error('flacEncoderWorker received data when the encoder is'
|
||||
+ 'not ready.');
|
||||
} else {
|
||||
encoder.encode(e.data.buf);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue