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58 lines
1.7 KiB
JavaScript

function PCMPlayer() {
this.samples = [];
this.flushingTime = 200;
this.createContext();
this.startFlushing();
this.flush = this.flush.bind(this);
this.interval = setInterval(this.flush, this.flushingTime);
this.setConfig = function(sampleRate, channels) {
this.sampleRate = sampleRate;
this.channels = channels;
}
this.createContext = function() {
this.audioCtx = new (window.AudioContext || window.webkitAudioContext)();
this.gainNode = this.audioCtx.createGain();
this.gainNode.gain.value = 1;
this.gainNode.connect(this.audioCtx.destination);
};
this.stopFlushing = function() {
if (this.interval) {
clearInterval(this.interval);
}
}
this.feed = function(data) {
let tmp = new Float32Array(this.samples.length + data.length);
tmp.set(this.samples, 0);
tmp.set(data, this.samples.length);
this.samples = tmp;
}
this.flush = function() {
let bufferSource = this.audioCtx.createBufferSource(),
length = this.samples.length,
audioBuffer = this.audioCtx.createBuffer(this.channels, length, this.sampleRate),
audioData,
channel,
offset,
i;
for (channel = 0; channel < this.channels; channel++) {
audioData = audioBuffer.getChannelData(channel);
offset = channel;
for (i = 0; i < length; i++) {
audioData[i] = this.samples[offset];
offset += this.channels;
}
}
bufferSource.buffer = audioBuffer;
bufferSource.connect(this.gainNode);
bufferSource.start();
this.samples = [];
}
}