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audio/wav: Parse header more accurately

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This commit is contained in:
Hajime Hoshi 2016-03-30 03:03:08 +09:00
parent 4e50588c0c
commit e0a058bcc3
1 changed files with 11 additions and 5 deletions
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16
exp/audio/wav/decode.go
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@ -91,13 +91,19 @@ chunks:
if err != nil {
return nil, err
}
// TODO: Remove this magic number
if buf[2] != 2 {
return nil, fmt.Errorf("wav: invalid header: channel num must be 2")
format := int(buf[0]) | int(buf[1])<<8
if format != 1 {
return nil, fmt.Errorf("wav: format must be linear PCM")
}
channelNum := int(buf[2]) | int(buf[3])<<8
// TODO: Remove this magic number
if buf[14] != 16 {
return nil, fmt.Errorf("wav: invalid header: depth must be 16")
if channelNum != 2 {
return nil, fmt.Errorf("wav: channel num must be 2")
}
bitsPerSample := int(buf[14]) | int(buf[15])<<8
// TODO: Remove this magic number
if bitsPerSample != 16 {
return nil, fmt.Errorf("wav: bits per sample must be 16")
}
sampleRate := int64(buf[4]) | int64(buf[5])<<8 | int64(buf[6])<<16 | int64(buf[7]<<24)
if int64(context.SampleRate()) != sampleRate {