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audio: context is in a member of player

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This commit is contained in:
Hajime Hoshi 2016-03-05 19:35:30 +09:00
parent fb5a366b97
commit 976d61816c
1 changed files with 7 additions and 9 deletions
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16
exp/audio/audio_js.go
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@ -23,12 +23,11 @@ import (
"github.com/gopherjs/gopherjs/js"
)
var context *js.Object
type player struct {
src io.Reader
sampleRate int
position float64
context *js.Object
bufferSource *js.Object
}
@ -40,7 +39,7 @@ func startPlaying(src io.Reader, sampleRate int) error {
return nil
}
if currentPlayer != nil || context != nil {
if currentPlayer != nil {
panic("audio: currentPlayer already exists")
}
class := js.Global.Get("AudioContext")
@ -50,14 +49,13 @@ func startPlaying(src io.Reader, sampleRate int) error {
if class == js.Undefined {
panic("audio: audio couldn't be initialized")
}
context = class.New()
currentPlayer = &player{
src: src,
sampleRate: sampleRate,
position: context.Get("currentTime").Float(),
bufferSource: nil,
context: class.New(),
}
currentPlayer.position = currentPlayer.context.Get("currentTime").Float()
if err := currentPlayer.start(); err != nil {
return err
}
@ -80,7 +78,7 @@ func (p *player) proceed() error {
if 0 < n {
const channelNum = 2
const bytesPerSample = channelNum * 16 / 8
b := context.Call("createBuffer", channelNum, n/bytesPerSample, p.sampleRate)
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])
@ -89,9 +87,9 @@ func (p *player) proceed() error {
l.SetIndex(i, float64(il[i])/max)
r.SetIndex(i, float64(ir[i])/max)
}
p.bufferSource = context.Call("createBufferSource")
p.bufferSource = p.context.Call("createBufferSource")
p.bufferSource.Set("buffer", b)
p.bufferSource.Call("connect", context.Get("destination"))
p.bufferSource.Call("connect", p.context.Get("destination"))
p.bufferSource.Call("start", p.position)
p.position += b.Get("duration").Float()
}