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audio: Bug fix: Lazy initialization of audio context

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This commit is contained in:
Hajime Hoshi 2016-05-25 03:47:59 +09:00
parent b65aeb7ac3
commit 0ee6b4405c
1 changed files with 13 additions and 6 deletions
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19
audio/audio.go
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@ -180,13 +180,8 @@ func NewContext(sampleRate int) (*Context, error) {
c.players = &players{
players: map[*Player]struct{}{},
}
// TODO: Rename this other than player
p, err := driver.NewPlayer(sampleRate, channelNum, bytesPerSample)
c.driver = p
if err != nil {
return nil, err
}
return c, nil
}
// Update proceeds the inner (logical) time of the context by 1/60 second.
@ -197,6 +192,18 @@ func NewContext(sampleRate int) (*Context, error) {
// you will find audio stops when the game stops e.g. when the window is deactivated.
// In async mode, the audio never stops even when the game stops.
func (c *Context) Update() error {
// Initialize c.driver lazily to enable calling NewContext in an 'init' function.
// Accessing driver functions requires that the environment is already initialized,
// but if Ebiten is used for a shared library, how init functions are called is unexpectable.
// e.g. a variable for JVM on Android might not be set.
if c.driver == nil {
// TODO: Rename this other than player
p, err := driver.NewPlayer(c.sampleRate, channelNum, bytesPerSample)
c.driver = p
if err != nil {
return err
}
}
c.frames++
bytesPerFrame := c.sampleRate * bytesPerSample * channelNum / ebiten.FPS
l := (c.frames * bytesPerFrame) - c.writtenBytes