func newMixer(mem *memory) (mix *mixer, err interface{}) {
format := ao.SampleFormat{
Bits: 16,
Rate: mem.config.AudioFreq,
Channels: 2,
ByteFormat: ao.FormatNative,
Matrix: "L,R",
}
ao.Initialize()
id := ao.DriverID(mem.config.AudioDriver)
if id < 0 {
id = ao.DefaultDriverID()
}
var device *ao.Device
device, err = ao.OpenLive(id, &format)
if err != nil {
ao.Shutdown()
return
}
if mem.config.AudioBuffers < 3 {
mem.config.AudioBuffers = 3
}
if mem.config.Verbose {
info, _ := ao.DriverInfo(id)
fmt.Println("Opened audio:")
fmt.Printf(" driver: [%s] %s\n", info.ShortName, info.Name)
fmt.Printf(" rate: %dHz\n", format.Rate)
fmt.Printf(" channels: %d\n", format.Channels)
fmt.Printf(" buffer size: %d samples\n", 1024)
fmt.Printf(" buffers: %d\n", mem.config.AudioBuffers)
}
mix = &mixer{SampleFormat: format, dev: device, memory: mem}
mix.buf = make([][]int16, mem.config.AudioBuffers)
for i := 0; i < len(mix.buf); i++ {
mix.buf[i] = make([]int16, 1024*2)
}
mix.ch4.initialize()
mix.send = make(chan []int16, len(mix.buf)-2)
mix.status = make(chan bool)
mix.quit = make(chan int)
go mix.runAudio()
return mix, nil
}
func (mix *mixer) runAudio() {
pause := false
for {
select {
case buf := <-mix.send:
if !pause {
mix.dev.Play16(buf)
}
case pause = <-mix.status:
// okay, pause updated
case <-mix.quit:
mix.dev.Close()
ao.Shutdown()
mix.quit <- 1
return
}
}
}