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pcm samples by channel

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Samir 2017-11-11 00:19:08 +06:00
parent 14254cc819
commit 556104a3e8
3 changed files with 7 additions and 6 deletions
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4
example/index.html
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@ -12,10 +12,10 @@
window.onload = function() { window.onload = function() {
var socketURL = 'ws://localhost:8080'; var socketURL = 'ws://localhost:8080';
var player = new PCMPlayer({ var player = new PCMPlayer({
encoding: '16bitInt', encoding: '32bitFloat',
channels: 2, channels: 2,
sampleRate: 8000, sampleRate: 8000,
flushingTime: 1000 flushingTime: 2000
}); });
var ws = new WebSocket(socketURL); var ws = new WebSocket(socketURL);

2
example/server/server.js
View file

@ -1,7 +1,7 @@
const WebSocket = require('ws'); const WebSocket = require('ws');
const fs = require('fs'); const fs = require('fs');
const pcm_file = './16bit-8000.raw'; const pcm_file = './32bit (float)-8000.raw';
let interval = 0, let interval = 0,
sampleRate = 8000, sampleRate = 8000,
channels = 2, channels = 2,

7
pcm-player.js
View file

@ -86,17 +86,18 @@ PCMPlayer.prototype.destroy = function() {
PCMPlayer.prototype.flush = function() { PCMPlayer.prototype.flush = function() {
if (!this.samples.length) return; if (!this.samples.length) return;
var bufferSource = this.audioCtx.createBufferSource(), var bufferSource = this.audioCtx.createBufferSource(),
length = this.samples.length, length = this.samples.length / this.option.channels,
audioBuffer = this.audioCtx.createBuffer(this.option.channels, length, this.option.sampleRate), audioBuffer = this.audioCtx.createBuffer(this.option.channels, length, this.option.sampleRate),
audioData, audioData,
channel, channel,
offset, offset,
i, i,
decrement = 50; decrement;
for (channel = 0; channel < this.option.channels; channel++) { for (channel = 0; channel < this.option.channels; channel++) {
audioData = audioBuffer.getChannelData(channel); audioData = audioBuffer.getChannelData(channel);
offset = channel; offset = channel;
decrement = 50;
for (i = 0; i < length; i++) { for (i = 0; i < length; i++) {
audioData[i] = this.samples[offset]; audioData[i] = this.samples[offset];
/* fadein */ /* fadein */
@ -114,7 +115,7 @@ PCMPlayer.prototype.flush = function() {
if (this.startTime < this.audioCtx.currentTime) { if (this.startTime < this.audioCtx.currentTime) {
this.startTime = this.audioCtx.currentTime; this.startTime = this.audioCtx.currentTime;
} }
console.log('start vs current '+this.startTime+' vs '+this.audioCtx.currentTime); console.log('start vs current '+this.startTime+' vs '+this.audioCtx.currentTime+' duration: '+audioBuffer.duration);
bufferSource.buffer = audioBuffer; bufferSource.buffer = audioBuffer;
bufferSource.connect(this.gainNode); bufferSource.connect(this.gainNode);
bufferSource.start(this.startTime); bufferSource.start(this.startTime);