ogg working with noise
Samir
7 years ago
parent
10e0283b8a
commit
f65222fc73
@ -1,58 +1,74 @@
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function PCMPlayer() {
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function PCMPlayer() {
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this.samples = [];
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this.samples = new Float32Array();
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this.flushingTime = 200;
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this.flushingTime = 200;
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this.createContext();
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this.startFlushing();
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this.flush = this.flush.bind(this);
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this.interval = setInterval(this.flush, this.flushingTime);
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this.setConfig = function(sampleRate, channels) {
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this.setConfig = function(sampleRate, channels) {
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this.sampleRate = sampleRate;
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this.sampleRate = sampleRate;
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this.channels = channels;
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this.channels = channels;
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}
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};
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this.createContext = function() {
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this.createContext = function() {
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this.audioCtx = new (window.AudioContext || window.webkitAudioContext)();
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this.audioCtx = new (window.AudioContext || window.webkitAudioContext)();
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this.gainNode = this.audioCtx.createGain();
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this.gainNode = this.audioCtx.createGain();
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this.gainNode.gain.value = 1;
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this.gainNode.gain.value = 1;
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this.gainNode.connect(this.audioCtx.destination);
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this.gainNode.connect(this.audioCtx.destination);
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this.startTime = this.audioCtx.currentTime;
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};
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};
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this.stopFlushing = function() {
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this.stopFlushing = function() {
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if (this.interval) {
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if (this.interval) {
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clearInterval(this.interval);
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clearInterval(this.interval);
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}
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}
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}
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};
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this.feed = function(data) {
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this.feed = function(data) {
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let tmp = new Float32Array(this.samples.length + data.length);
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let tmp = new Float32Array(this.samples.length + data.length);
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tmp.set(this.samples, 0);
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tmp.set(this.samples, 0);
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tmp.set(data, this.samples.length);
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tmp.set(data, this.samples.length);
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this.samples = tmp;
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this.samples = tmp;
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}
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};
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this.flush = function() {
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this.flush = function() {
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if (!this.channels || !this.sampleRate || !this.samples.length) return;
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let bufferSource = this.audioCtx.createBufferSource(),
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let bufferSource = this.audioCtx.createBufferSource(),
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length = this.samples.length,
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length = this.samples.length,
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audioBuffer = this.audioCtx.createBuffer(this.channels, length, this.sampleRate),
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audioBuffer = this.audioCtx.createBuffer(this.channels, length, this.sampleRate),
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audioData,
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audioData,
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channel,
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channel,
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offset,
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offset,
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i;
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i,
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decrement = 50;
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for (channel = 0; channel < this.channels; channel++) {
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for (channel = 0; channel < this.channels; channel++) {
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audioData = audioBuffer.getChannelData(channel);
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audioData = audioBuffer.getChannelData(channel);
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offset = channel;
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offset = channel;
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for (i = 0; i < length; i++) {
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for (i = 0; i < length; i++) {
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audioData[i] = this.samples[offset];
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audioData[i] = this.samples[offset];
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/* fadein */
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if (i < 50) {
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audioData[i] = (audioData[i] * i) / 50;
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}
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/* fadeout*/
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if (i >= (length - 51)) {
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audioData[i] = (audioData[i] * decrement--) / 50;
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}
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offset += this.channels;
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offset += this.channels;
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}
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}
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}
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}
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if (this.startTime < this.audioCtx.currentTime) {
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this.startTime = this.audioCtx.currentTime;
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}
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bufferSource.buffer = audioBuffer;
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bufferSource.buffer = audioBuffer;
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bufferSource.connect(this.gainNode);
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bufferSource.connect(this.gainNode);
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bufferSource.start();
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bufferSource.start(this.startTime);
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this.samples = [];
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this.startTime += audioBuffer.duration;
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}
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this.samples = new Float32Array();
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};
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/* initiate start flushing */
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this.flush = this.flush.bind(this);
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this.createContext();
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this.interval = setInterval(this.flush, this.flushingTime);
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}
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}
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