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audio: Audio now works on browsers (#175)

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This commit is contained in:
Hajime Hoshi 2016-03-05 21:09:17 +09:00
parent 6d85d82c85
commit d33bb06f1d
1 changed files with 24 additions and 9 deletions
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33
exp/audio/audio_js.go
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@ -72,26 +72,41 @@ func toLR(data []byte) ([]int16, []int16) {
return l, r
}
func maxF(a, b float64) float64 {
if a > b {
return a
}
return b
}
func (p *player) proceed() error {
buf := make([]byte, 4096)
n, err := p.src.Read(buf)
const bufferSize = 4096
c := p.context.Get("currentTime").Float()
if c < p.position-bufferSize*0.5/float64(p.sampleRate) {
return nil
}
b := make([]byte, bufferSize)
n, err := p.src.Read(b)
if 0 < n {
const channelNum = 2
const bytesPerSample = channelNum * 16 / 8
b := p.context.Call("createBuffer", channelNum, n/bytesPerSample, p.sampleRate)
l := b.Call("getChannelData", 0)
r := b.Call("getChannelData", 1)
il, ir := toLR(buf[:n])
buf := p.context.Call("createBuffer", channelNum, n/bytesPerSample, p.sampleRate)
l := buf.Call("getChannelData", 0)
r := buf.Call("getChannelData", 1)
il, ir := toLR(b[:n])
const max = 1 << 15
for i := 0; i < len(il); i++ {
l.SetIndex(i, float64(il[i])/max)
r.SetIndex(i, float64(ir[i])/max)
}
p.bufferSource = p.context.Call("createBufferSource")
p.bufferSource.Set("buffer", b)
p.bufferSource.Set("buffer", buf)
p.bufferSource.Call("connect", p.context.Get("destination"))
p.bufferSource.Call("start", p.position)
p.position += b.Get("duration").Float()
p.bufferSource.Call("start", maxF(p.position, c))
p.position += buf.Get("duration").Float()
if p.position < c {
p.position = c
}
}
return err
}