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audio/internal/readerdriver: Refactoring (Windows)

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This commit is contained in:
Hajime Hoshi 2021-05-29 03:43:05 +09:00
parent 98bfe5a692
commit c46981a719
1 changed files with 69 additions and 79 deletions
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148
audio/internal/readerdriver/driver_windows.go
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@ -303,20 +303,6 @@ func (p *playerImpl) playImpl() {
thePlayers.add(p, p.waveOut) thePlayers.add(p, p.waveOut)
} }
buf := make([]byte, p.context.maxBufferSize())
for len(p.buf) < p.context.maxBufferSize() {
n, err := p.src.Read(buf)
if err != nil && err != io.EOF {
p.setErrorImpl(err)
return
}
p.buf = append(p.buf, buf[:n]...)
if err == io.EOF {
p.eof = true
break
}
}
if p.eof && len(p.buf) == 0 { if p.eof && len(p.buf) == 0 {
return return
} }
@ -537,7 +523,7 @@ func (p *playerImpl) readAndWriteBufferImpl() {
return return
} }
if len(p.buf) < p.context.maxBufferSize() && !p.eof { for len(p.buf) < p.context.maxBufferSize() && !p.eof {
buf := make([]byte, p.context.maxBufferSize()) buf := make([]byte, p.context.maxBufferSize())
n, err := p.src.Read(buf) n, err := p.src.Read(buf)
if err != nil && err != io.EOF { if err != nil && err != io.EOF {
@ -545,84 +531,88 @@ func (p *playerImpl) readAndWriteBufferImpl() {
return return
} }
p.buf = append(p.buf, buf[:n]...) p.buf = append(p.buf, buf[:n]...)
if err == io.EOF && len(p.buf) == 0 { if err == io.EOF {
p.eof = true if len(p.buf) == 0 {
p.eof = true
}
break
} }
} }
if len(p.buf) > 0 { for _, h := range p.headers {
for _, h := range p.headers { if len(p.buf) == 0 {
if h.IsQueued() { break
continue }
} if h.IsQueued() {
continue
}
n := headerBufferSize n := headerBufferSize
if n > len(p.buf) { if n > len(p.buf) {
n = len(p.buf) n = len(p.buf)
} }
buf := p.buf[:n] buf := p.buf[:n]
// Adjust the volume // Adjust the volume
if p.volume < 1 { if p.volume < 1 {
switch p.context.bitDepthInBytes { switch p.context.bitDepthInBytes {
case 1: case 1:
const ( const (
max = 127 max = 127
min = -128 min = -128
offset = 128 offset = 128
) )
for i, b := range buf { for i, b := range buf {
x := int16(b) - offset x := int16(b) - offset
x = int16(float64(x) * p.volume) x = int16(float64(x) * p.volume)
if x > max { if x > max {
x = max x = max
}
if x < min {
x = min
}
buf[i] = byte(x + offset)
} }
case 2: if x < min {
const ( x = min
max = (1 << 15) - 1
min = -(1 << 15)
)
for i := 0; i < n/2; i++ {
x := int32(int16(buf[2*i]) | (int16(buf[2*i+1]) << 8))
x = int32(float64(x) * p.volume)
if x > max {
x = max
}
if x < min {
x = min
}
buf[2*i] = byte(x)
buf[2*i+1] = byte(x >> 8)
} }
buf[i] = byte(x + offset)
}
case 2:
const (
max = (1 << 15) - 1
min = -(1 << 15)
)
for i := 0; i < n/2; i++ {
x := int32(int16(buf[2*i]) | (int16(buf[2*i+1]) << 8))
x = int32(float64(x) * p.volume)
if x > max {
x = max
}
if x < min {
x = min
}
buf[2*i] = byte(x)
buf[2*i+1] = byte(x >> 8)
} }
} }
}
if err := h.Write(buf); err != nil { if err := h.Write(buf); err != nil {
// This error can happen when e.g. a new HDMI connection is detected (hajimehoshi/oto#51). // This error can happen when e.g. a new HDMI connection is detected (hajimehoshi/oto#51).
const errorNotFound = 1168 const errorNotFound = 1168
if werr := err.(*winmmError); werr.fname == "waveOutWrite" { if werr := err.(*winmmError); werr.fname == "waveOutWrite" {
switch { switch {
case werr.mmresult == mmsyserrNomem: case werr.mmresult == mmsyserrNomem:
continue continue
case werr.errno == errorNotFound: case werr.errno == errorNotFound:
// TODO: Retry later. // TODO: Retry later.
}
} }
p.setErrorImpl(err)
return
} }
p.setErrorImpl(err)
return
}
p.buf = p.buf[n:] p.buf = p.buf[n:]
// 4 is an arbitrary number that doesn't cause a problem at examples/piano (#1653). // 4 is an arbitrary number that doesn't cause a problem at examples/piano (#1653).
if p.queuedHeadersNum() >= 4 { if p.queuedHeadersNum() >= 4 {
break break
}
} }
} }