1 Frame WAV Header
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<!DOCTYPE> | |
<html> | |
<head> | |
<title>WAV Header</title> | |
<script> | |
var buildWaveHeader = function(opts) { | |
var numFrames = opts.numFrames, | |
numChannels = opts.numChannels || 2, | |
sampleRate = opts.sampleRate || 44100, | |
bytesPerSample = opts.bytesPerSample || 2, | |
blockAlign = numChannels * bytesPerSample, | |
byteRate = sampleRate * blockAlign, | |
dataSize = numFrames * blockAlign; | |
var buffer = new ArrayBuffer(44), | |
dv = new DataView(buffer), | |
p = 0; | |
var writeString = function(s) { | |
for (var i = 0; i < s.length; i++) { | |
dv.setUint8(p + i, s.charCodeAt(i)); | |
} | |
p += s.length; | |
} | |
var writeUint32 = function(d) { | |
dv.setUint32(p, d, true); | |
p += 4; | |
} | |
var writeUint16 = function(d) { | |
dv.setUint16(p, d, true); | |
p += 2; | |
} | |
writeString('RIFF'); // ChunkID | |
writeUint32(dataSize * 960 + 36); // ChunkSize | |
writeString('WAVE'); // Format | |
writeString('fmt '); // Subchunk1ID | |
writeUint32(16); // Subchunk1Size | |
writeUint16(1); // AudioFormat | |
writeUint16(numChannels); // NumChannels | |
writeUint32(sampleRate); // SampleRate | |
writeUint32(byteRate); // ByteRate | |
writeUint16(blockAlign); // BlockAlign | |
writeUint16(bytesPerSample * 8); // BitsPerSample | |
writeString('data'); // Subchunk2ID | |
writeUint32(dataSize * 960); // Subchunk2Size | |
return buffer; | |
} | |
</script> | |
</head> | |
<body> | |
<h2>WAV Header</h2> | |
<article> | |
<h2>1 Frame WAV Header</h2> | |
<script> | |
var buffer = buildWaveHeader({ numFrames: 1 }); | |
var stringify = function(view) { | |
return '[' + Array.prototype.slice.call(view).join(', ') + ']'; | |
} | |
</script> | |
<section> | |
<h3>Uint8Array</h3> | |
<script>document.write(stringify(new Uint8Array(buffer)));</script> | |
</section> | |
<section> | |
<h3>Uint16Array</h3> | |
<script>document.write(stringify(new Uint16Array(buffer)));</script> | |
</section> | |
<section> | |
<h3>Int8Array</h3> | |
<script>document.write(stringify(new Int8Array(buffer)));</script> | |
</section> | |
<section> | |
<h3>Int16Array</h3> | |
<script>document.write(stringify(new Int16Array(buffer)));</script> | |
</section> | |
</article> | |
</body> | |
</html> |
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