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audio: Bug fix: Noise on Safari because of performance issue (#307)

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This commit is contained in:
Hajime Hoshi 2017-01-22 19:19:24 +09:00
parent 6e897d1479
commit 7201015d02
1 changed files with 6 additions and 2 deletions
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8
audio/internal/driver/driver_js.go
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@ -91,9 +91,13 @@ func toLR(data []byte) ([]int16, []int16) {
}
func (p *Player) Proceed(data []byte) error {
// delay is buffer in sample numbers for p.positionInSamples.
// Without this, adjusting p.positionInSamples with the context's currenTime
// much more often especially on Safari, which is the cause of noise (#307).
const delay = 256
p.bufferedData = append(p.bufferedData, data...)
c := int64(p.context.Get("currentTime").Float() * float64(p.sampleRate))
if p.positionInSamples < c {
if p.positionInSamples+delay < c {
p.positionInSamples = c
}
// Heuristic data size which doesn't cause too much noise and too much delay (#299)
@ -114,7 +118,7 @@ func (p *Player) Proceed(data []byte) error {
s := p.context.Call("createBufferSource")
s.Set("buffer", buf)
s.Call("connect", p.context.Get("destination"))
s.Call("start", float64(p.positionInSamples)/float64(p.sampleRate))
s.Call("start", float64(p.positionInSamples+delay)/float64(p.sampleRate))
p.positionInSamples += int64(len(il))
p.bufferedData = p.bufferedData[dataSize:]
}