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examples/realtimepcm: use NewPlayerF32

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Updates #2160
This commit is contained in:
Hajime Hoshi 2024-07-23 01:06:42 +09:00
parent fa457f67cd
commit 268b638a15
1 changed files with 16 additions and 12 deletions
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28
examples/realtimepcm/main.go
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@ -75,23 +75,27 @@ func (s *SineWave) Read(buf []byte) (int, error) {
s.m.Lock() s.m.Lock()
defer s.m.Unlock() defer s.m.Unlock()
n := len(buf) / 4 * 4 const bytesPerSample = 8
n := len(buf) / bytesPerSample * bytesPerSample
buf = buf[:n] buf = buf[:n]
length := sampleRate / float64(s.frequency) length := sampleRate / float64(s.frequency)
p := int64(length * s.pos) p := float64(length * s.pos)
for i := 0; i < len(buf)/4; i++ { for i := 0; i < n/bytesPerSample; i++ {
const max = 32767 v := math.Float32bits(float32(math.Sin(2 * math.Pi * p / length)))
b := int16(math.Sin(2*math.Pi*float64(p)/float64(length)) * max) buf[8*i] = byte(v)
buf[4*i] = byte(b) buf[8*i+1] = byte(v >> 8)
buf[4*i+1] = byte(b >> 8) buf[8*i+2] = byte(v >> 16)
buf[4*i+2] = byte(b) buf[8*i+3] = byte(v >> 24)
buf[4*i+3] = byte(b >> 8) buf[8*i+4] = byte(v)
buf[8*i+5] = byte(v >> 8)
buf[8*i+6] = byte(v >> 16)
buf[8*i+7] = byte(v >> 24)
p++ p++
} }
s.pos = float64(p) / float64(length) _, s.pos = math.Modf(p / length)
s.pos = s.pos - math.Floor(s.pos)
return n, nil return n, nil
} }
@ -108,7 +112,7 @@ func (g *Game) Update() error {
} }
if g.player == nil { if g.player == nil {
g.sineWave = NewSineWave() g.sineWave = NewSineWave()
p, err := g.audioContext.NewPlayer(g.sineWave) p, err := g.audioContext.NewPlayerF32(g.sineWave)
if err != nil { if err != nil {
return err return err
} }