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#128 Bug fix: Delay when playing audio

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This commit is contained in:
Hajime Hoshi 2015-06-07 23:24:15 +09:00
parent 47f31f75a0
commit 23cef1b715
1 changed files with 34 additions and 22 deletions
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44
exp/audio/internal/audio.go
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@ -48,41 +48,47 @@ func isPlaying(channel int) bool {
}
func channelAt(i int) *channel {
var ch *channel
withChannels(func() {
if i == -1 {
for i, _ := range channels {
if !isPlaying(i) {
return channels[i]
ch = channels[i]
return
}
}
return nil
return
}
if !isPlaying(i) {
return channels[i]
ch = channels[i]
return
}
return nil
return
})
return ch
}
func Play(channel int, l []int16, r []int16) bool {
result := false
ch := channelAt(channel)
if ch == nil {
return false
}
withChannels(func() {
if !audioEnabled {
return
}
if len(l) != len(r) {
panic("len(l) must equal to len(r)")
}
ch := channelAt(channel)
if ch == nil {
return
d := ch.nextInsertionPosition - len(l)
if 0 < d {
ch.l = append(ch.l, make([]int16, d)...)
ch.r = append(ch.r, make([]int16, d)...)
}
ch.l = append(ch.l, make([]int16, ch.nextInsertionPosition-len(ch.l))...)
ch.r = append(ch.r, make([]int16, ch.nextInsertionPosition-len(ch.r))...)
ch.l = append(ch.l, l...)
ch.r = append(ch.r, r...)
result = true
})
return result
return true
}
func Queue(channel int, l []int16, r []int16) {
@ -90,7 +96,6 @@ func Queue(channel int, l []int16, r []int16) {
if !audioEnabled {
return
}
if len(l) != len(r) {
panic("len(l) must equal to len(r)")
}
@ -102,7 +107,11 @@ func Queue(channel int, l []int16, r []int16) {
func Tick() {
for _, ch := range channels {
ch.nextInsertionPosition += SampleRate / 60
if 0 < len(ch.l) {
ch.nextInsertionPosition += SampleRate / 60 // FPS
} else {
ch.nextInsertionPosition = 0
}
}
}
@ -142,9 +151,12 @@ func loadChannelBuffer(channel int, bufferSize int) (l, r []int16) {
length := min(len(ch.l), bufferSize)
inputL := ch.l[:length]
inputR := ch.r[:length]
ch.nextInsertionPosition -= length
if ch.nextInsertionPosition < 0 {
ch.nextInsertionPosition = 0
}
ch.l = ch.l[length:]
ch.r = ch.r[length:]
ch.nextInsertionPosition -= min(bufferSize, ch.nextInsertionPosition)
l, r = inputL, inputR
})
return