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audio: Better conversion from 8bit to 16bit

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This commit is contained in:
Hajime Hoshi 2017-01-16 23:03:36 +09:00
parent f9ab7d9043
commit abd0958566
1 changed files with 3 additions and 3 deletions
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6
audio/internal/convert/stereo16.go
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@ -50,7 +50,7 @@ func (s *Stereo16) Read(b []uint8) (int, error) {
switch { switch {
case s.mono && s.eight: case s.mono && s.eight:
for i := 0; i < n; i++ { for i := 0; i < n; i++ {
v := (int16(buf[i]) - 128) << 8 v := int16(int(buf[i])*0x101 - (1 << 15))
b[4*i] = uint8(v) b[4*i] = uint8(v)
b[4*i+1] = uint8(v >> 8) b[4*i+1] = uint8(v >> 8)
b[4*i+2] = uint8(v) b[4*i+2] = uint8(v)
@ -65,8 +65,8 @@ func (s *Stereo16) Read(b []uint8) (int, error) {
} }
case !s.mono && s.eight: case !s.mono && s.eight:
for i := 0; i < n/2; i++ { for i := 0; i < n/2; i++ {
v0 := (int16(buf[2*i]) - 128) << 8 v0 := int16(int(buf[2*i])*0x101 - (1 << 15))
v1 := (int16(buf[2*i+1]) - 128) << 8 v1 := int16(int(buf[2*i+1])*0x101 - (1 << 15))
b[4*i] = uint8(v0) b[4*i] = uint8(v0)
b[4*i+1] = uint8(v0 >> 8) b[4*i+1] = uint8(v0 >> 8)
b[4*i+2] = uint8(v1) b[4*i+2] = uint8(v1)