audio/sdl/currently_playing.go

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package sdl
import "errors"
// setPlaying associates a channel no. to the Track playing.
func (e *Engine) setPlaying(channel int, t *Track) {
e.channelMu.Lock()
defer e.channelMu.Unlock()
e.channelsPlaying[channel] = t
}
// unsetPlaying associates a channel no. to the Track playing.
func (e *Engine) unsetPlaying(channel int) error {
e.channelMu.Lock()
defer e.channelMu.Unlock()
if track, ok := e.channelsPlaying[channel]; ok {
track.channel = -1
delete(e.channelsPlaying, channel)
return nil
}
return errors.New("didn't even know channel %d was playing a sound")
}
// isPlaying checks if a sound effect is playing on a channel.
func (e *Engine) isPlaying(channel int) bool {
e.channelMu.RLock()
defer e.channelMu.RUnlock()
_, ok := e.channelsPlaying[channel]
return ok
}