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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 { func channelAt(i int) *channel {
var ch *channel
withChannels(func() {
if i == -1 { if i == -1 {
for i, _ := range channels { for i, _ := range channels {
if !isPlaying(i) { if !isPlaying(i) {
return channels[i] ch = channels[i]
return
} }
} }
return nil return
} }
if !isPlaying(i) { if !isPlaying(i) {
return channels[i] ch = channels[i]
return
} }
return nil return
})
return ch
} }
func Play(channel int, l []int16, r []int16) bool { func Play(channel int, l []int16, r []int16) bool {
result := false ch := channelAt(channel)
if ch == nil {
return false
}
withChannels(func() { withChannels(func() {
if !audioEnabled { if !audioEnabled {
return return
} }
if len(l) != len(r) { if len(l) != len(r) {
panic("len(l) must equal to len(r)") panic("len(l) must equal to len(r)")
} }
ch := channelAt(channel) d := ch.nextInsertionPosition - len(l)
if ch == nil { if 0 < d {
return 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.l = append(ch.l, l...)
ch.r = append(ch.r, r...) ch.r = append(ch.r, r...)
result = true
}) })
return result return true
} }
func Queue(channel int, l []int16, r []int16) { func Queue(channel int, l []int16, r []int16) {
@ -90,7 +96,6 @@ func Queue(channel int, l []int16, r []int16) {
if !audioEnabled { if !audioEnabled {
return return
} }
if len(l) != len(r) { if len(l) != len(r) {
panic("len(l) must equal to len(r)") panic("len(l) must equal to len(r)")
} }
@ -102,7 +107,11 @@ func Queue(channel int, l []int16, r []int16) {
func Tick() { func Tick() {
for _, ch := range channels { 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) length := min(len(ch.l), bufferSize)
inputL := ch.l[:length] inputL := ch.l[:length]
inputR := ch.r[:length] inputR := ch.r[:length]
ch.nextInsertionPosition -= length
if ch.nextInsertionPosition < 0 {
ch.nextInsertionPosition = 0
}
ch.l = ch.l[length:] ch.l = ch.l[length:]
ch.r = ch.r[length:] ch.r = ch.r[length:]
ch.nextInsertionPosition -= min(bufferSize, ch.nextInsertionPosition)
l, r = inputL, inputR l, r = inputL, inputR
}) })
return return