我有一个包含wFormatTag的WAVE文件,即3 (WAVE_FORMAT_IEEE_FLOAT)。火狐像对待WAVE_FORMAT_IEEE_FLOAT文件一样对待WAVE_FORMAT_EXTENSIBLE,这意味着它希望WAVE_FORMAT_IEEE_FLOAT文件包含fmt块的扩展部分。
我的文件不包含fmt块的扩展部分,这将导致在Firefox:The buffer passed to decodeAudioData contains invalid content which cannot be decoded successfully.中解码文件时出错。
这意味着我必须在字节38处添加wValidBitsPerSample,在字节40处添加dwChannelMask,在字节44处添加SubFormat。,我应该为这三个标题字段添加哪些信息?这些信息的含义是什么?如何以8-16-32位整数的形式添加这些信息?
谢谢你的帮助:)。
以下是我的文件的头信息:
console.log('ckID', String.fromCharCode(dataView.getUint8(0))); // R
console.log('ckID', String.fromCharCode(dataView.getUint8(1))); // I
console.log('ckID', String.fromCharCode(dataView.getUint8(2))); // F
console.log('ckID', String.fromCharCode(dataView.getUint8(3))); // F
console.log('cksize', dataView.getUint32(4, true)); // 65623058
console.log('WAVEID', String.fromCharCode(dataView.getUint8(8))); // W
console.log('WAVEID', String.fromCharCode(dataView.getUint8(9))); // A
console.log('WAVEID', String.fromCharCode(dataView.getUint8(10))); // V
console.log('WAVEID', String.fromCharCode(dataView.getUint8(11))); // E
console.log('ckID', String.fromCharCode(dataView.getUint8(12))); // f
console.log('ckID', String.fromCharCode(dataView.getUint8(13))); // m
console.log('ckID', String.fromCharCode(dataView.getUint8(14))); // t
console.log('ckID', String.fromCharCode(dataView.getUint8(15))); //
console.log('cksize', (dataView.getUint32(16, true))); // 16
console.log('wFormatTag', (dataView.getUint16(20, true))); // 3
console.log('nChannels', (dataView.getUint16(22, true))); // 2
console.log('nSamplesPerSec', (dataView.getUint32(24, true))); // 44100
console.log('nAvgBytesPerSec', (dataView.getUint32(28, true))); // 352800
console.log('nBlockAlign', (dataView.getUint16(32, true))); // 8
console.log('wBitsPerSample', (dataView.getUint16(34, true))); // 32
console.log('cbSize', (dataView.getUint16(36, true))); // 0
console.log('ckID', String.fromCharCode(dataView.getUint8(38))); // f
console.log('ckID', String.fromCharCode(dataView.getUint8(39))); // a
console.log('ckID', String.fromCharCode(dataView.getUint8(40))); // c
console.log('ckID', String.fromCharCode(dataView.getUint8(41))); // t
console.log('cksize', (dataView.getUint16(42, true))); // 4
console.log('dwSampleLength', (dataView.getUint16(46, true))); // 10876
console.log('ckID', String.fromCharCode(dataView.getUint8(50))); // d
console.log('ckID', String.fromCharCode(dataView.getUint8(51))); // a
console.log('ckID', String.fromCharCode(dataView.getUint8(52))); // t
console.log('ckID', String.fromCharCode(dataView.getUint8(53))); // a发布于 2017-07-10 15:57:44
根据bug.cgi?id=1349658的说法,火狐不支持float32 WAV文件。
https://stackoverflow.com/questions/44976805
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