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#9 force resample web audio api to 44.1kHz

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XProger 2016-10-04 23:37:25 +03:00
parent 831e0765db
commit 95f5794a83
1 changed files with 6 additions and 6 deletions
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12
src/web/index.html
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@ -47,20 +47,20 @@
function snd_init() {
var AudioContext = window.AudioContext || window.webkitAudioContext;
if (!AudioContext) return;
var ctx = new (window.AudioContext || window.webkitAudioContext)();
var ctx = new (window.AudioContext || window.webkitAudioContext)();
var count = 2048;
var frames = Module._malloc(count * 4); // interleaved short L, R
var rate = 44100 / ctx.sampleRate;
var framesCount = Math.ceil(count * rate);
var frames = Module._malloc(framesCount * 4); // interleaved short L, R
var proc = ctx.createScriptProcessor(count, 2, 2);
proc.onaudioprocess = function(e) {
var L = e.outputBuffer.getChannelData(0),
R = e.outputBuffer.getChannelData(1);
Module.ccall('snd_fill', 'null', ['number', 'number'], [frames, count]);
var index = frames;
Module.ccall('snd_fill', 'null', ['number', 'number'], [frames, framesCount]);
for (var i = 0; i < count; i++) {
var index = frames + Math.floor(i * rate) * 4; // 4 is sample frame stride in bytes
L[i] = Module.getValue(index , 'i16') / 0x8000;
R[i] = Module.getValue(index + 2, 'i16') / 0x8000;
index += 4;
}
}
proc.connect(ctx.destination);