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audio/mp3: Bug fix: noise on browsers

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This commit is contained in:
Hajime Hoshi 2017-06-19 01:04:37 +09:00
parent 0f20b7b216
commit fe70dcc51f
1 changed files with 16 additions and 3 deletions
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19
audio/mp3/decode_js.go
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@ -39,9 +39,22 @@ func (s *Stream) Read(b []byte) (int, error) {
l = len(b) l = len(b)
} }
l = l / 4 * 4 l = l / 4 * 4
const max = 1<<15 - 1
for i := 0; i < l/4; i++ { for i := 0; i < l/4; i++ {
il := int16(s.leftData[s.posInBytes/4+i] * (1 << 15)) il := int32(s.leftData[s.posInBytes/4+i] * max)
ir := int16(s.rightData[s.posInBytes/4+i] * (1 << 15)) if il > max {
il = max
}
if il < -max {
il = -max
}
ir := int32(s.rightData[s.posInBytes/4+i] * max)
if ir > max {
ir = max
}
if ir < -max {
ir = -max
}
b[4*i] = uint8(il) b[4*i] = uint8(il)
b[4*i+1] = uint8(il >> 8) b[4*i+1] = uint8(il >> 8)
b[4*i+2] = uint8(ir) b[4*i+2] = uint8(ir)
@ -62,7 +75,7 @@ func (s *Stream) Seek(offset int64, whence int) (int64, error) {
case 1: case 1:
next = int64(s.posInBytes) + offset next = int64(s.posInBytes) + offset
case 2: case 2:
next = int64(len(s.leftData)*4) + offset next = s.Size() + offset
} }
s.posInBytes = int(next) s.posInBytes = int(next)
return next, nil return next, nil