bug2021955.html - mozsearch

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<!DOCTYPE html>

<html class="reftest-wait">

<head><meta charset="utf-8"></head>

<body>

<script>

function le16(v){return[v&0xff,(v>>8)&0xff]}

function le32(v){return[v&0xff,(v>>8)&0xff,(v>>16)&0xff,(v>>24)&0xff]}

const nChannels = 9;

const sampleRate = 44100;

const bitsPerSample = 16;

const blockAlign = nChannels * bitsPerSample / 8;

const byteRate = sampleRate * blockAlign;

const nFrames = 2000;

const dataSize = nFrames * blockAlign;

const pcmGUID = [0x01,0x00,0x00,0x00, 0x00,0x00, 0x10,0x00, 0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71];

const fmt = [

  ...le16(0xFFFE),

  ...le16(nChannels),

  ...le32(sampleRate),

  ...le32(byteRate),

  ...le16(blockAlign),

  ...le16(bitsPerSample),

  ...le16(22),

  ...le16(bitsPerSample),

  ...le32(0x1FF),

  ...pcmGUID

];

const pcmData = new Uint8Array(dataSize);

for(let i=0;i<dataSize;i++) pcmData[i] = (i*7)&0xff;

const fmtChunk = [0x66,0x6D,0x74,0x20, ...le32(fmt.length), ...fmt];

const dataChunk = [0x64,0x61,0x74,0x61, ...le32(dataSize)];

const riffSize = 4 + fmtChunk.length + dataChunk.length + dataSize;

const header = new Uint8Array([

  0x52,0x49,0x46,0x46,

  ...le32(riffSize),

  0x57,0x41,0x56,0x45,

  ...fmtChunk,

  ...dataChunk

]);

const wav = new Uint8Array(header.length + dataSize);

wav.set(header, 0);

wav.set(pcmData, header.length);

const blob = new Blob([wav], {type:'audio/wav'});

const url = URL.createObjectURL(blob);

const audio = document.createElement('audio');

audio.src = url;

audio.autoplay = true;

audio.loop = true;

document.body.appendChild(audio);

audio.addEventListener('playing', () => {

  setTimeout(() => { document.documentElement.className = ""; }, 500);

});

audio.play();

</script>

</body>

</html>