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examples/realtimepcm: refactoring

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This commit is contained in:
Hajime Hoshi 2024-07-23 01:01:28 +09:00
parent ce6931f81c
commit fa457f67cd
1 changed files with 8 additions and 24 deletions
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30
examples/realtimepcm/main.go
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@ -42,10 +42,8 @@ type SineWave struct {
minFrequency int minFrequency int
maxFrequency int maxFrequency int
// position is the position in the wave length in the range of [0, 1). // pos is the position in the wave length in the range of [0, 1).
position float64 pos float64
remaining []byte
m sync.Mutex m sync.Mutex
} }
@ -77,20 +75,11 @@ func (s *SineWave) Read(buf []byte) (int, error) {
s.m.Lock() s.m.Lock()
defer s.m.Unlock() defer s.m.Unlock()
if len(s.remaining) > 0 { n := len(buf) / 4 * 4
n := copy(buf, s.remaining) buf = buf[:n]
s.remaining = s.remaining[n:]
return n, nil
}
var origBuf []byte
if len(buf)%4 > 0 {
origBuf = buf
buf = make([]byte, len(origBuf)+4-len(origBuf)%4)
}
length := sampleRate / float64(s.frequency) length := sampleRate / float64(s.frequency)
p := int64(length * s.position) p := int64(length * s.pos)
for i := 0; i < len(buf)/4; i++ { for i := 0; i < len(buf)/4; i++ {
const max = 32767 const max = 32767
b := int16(math.Sin(2*math.Pi*float64(p)/float64(length)) * max) b := int16(math.Sin(2*math.Pi*float64(p)/float64(length)) * max)
@ -101,15 +90,10 @@ func (s *SineWave) Read(buf []byte) (int, error) {
p++ p++
} }
s.position = float64(p) / float64(length) s.pos = float64(p) / float64(length)
s.position = s.position - math.Floor(s.position) s.pos = s.pos - math.Floor(s.pos)
if origBuf != nil {
n := copy(origBuf, buf)
s.remaining = buf[n:]
return n, nil return n, nil
}
return len(buf), nil
} }
func NewGame() *Game { func NewGame() *Game {