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examples/sinewave: use NewPlayerF32

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Updates #2160
This commit is contained in:
Hajime Hoshi 2024-07-22 23:05:41 +09:00
parent e2a93b5d30
commit f717844076
1 changed files with 15 additions and 12 deletions
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27
examples/sinewave/main.go
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@ -48,25 +48,28 @@ func (s *stream) Read(buf []byte) (int, error) {
} }
var origBuf []byte var origBuf []byte
if len(buf)%4 > 0 { if len(buf)%8 > 0 {
origBuf = buf origBuf = buf
buf = make([]byte, len(origBuf)+4-len(origBuf)%4) buf = make([]byte, len(origBuf)+8-len(origBuf)%8)
} }
const length = int64(sampleRate / frequency) const length = int64(sampleRate / frequency)
p := s.position / 4 p := s.position / 8
for i := 0; i < len(buf)/4; i++ { for i := 0; i < len(buf)/8; i++ {
const max = 32767 v := math.Float32bits(float32(math.Sin(2 * math.Pi * float64(p) / float64(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.position += int64(len(buf)) s.position += int64(len(buf))
s.position %= length * 4 s.position %= length * 8
if origBuf != nil { if origBuf != nil {
n := copy(origBuf, buf) n := copy(origBuf, buf)
@ -94,7 +97,7 @@ func (g *Game) Update() error {
// Pass the (infinite) stream to NewPlayer. // Pass the (infinite) stream to NewPlayer.
// After calling Play, the stream never ends as long as the player object lives. // After calling Play, the stream never ends as long as the player object lives.
var err error var err error
g.player, err = g.audioContext.NewPlayer(&stream{}) g.player, err = g.audioContext.NewPlayerF32(&stream{})
if err != nil { if err != nil {
return err return err
} }