func OpenAudio(desired, obtained_orNil *AudioSpec) int {
if alreadyOpened {
panic("more than 1 audio stream currently not supported")
}
// copy handle to user-defined callback function, if defined
// it is perfectly supported to not specify the callback function
// in that case you will use default SendAudio semantics
// note that if you specify a callback and use SendAudio, a hangup will instead happen
// when calling SendAudio
if nil != desired.UserDefinedCallback {
userDefinedCallback = desired.UserDefinedCallback
} else {
// default playback (16-bit signed)
userDefinedCallback = DownstreamPlaybackS16
PlayLoop = make(chan AudioEvent)
}
var C_desired, C_obtained *C.SDL_AudioSpec
C_desired = new(C.SDL_AudioSpec)
C_desired.freq = C.int(desired.Freq)
C_desired.format = C.Uint16(desired.Format)
C_desired.channels = C.Uint8(desired.Channels)
C_desired.samples = C.Uint16(desired.Samples)
// there is an unique C callback acting as proxy to the different Go callbacks
// see streamContext()
C_desired.callback = C.callback_getCallback()
if obtained_orNil != nil {
if desired != obtained_orNil {
C_obtained = new(C.SDL_AudioSpec)
} else {
C_obtained = C_desired
}
}
status := C.SDL_OpenAudio(C_desired, C_obtained)
if status == 0 {
alreadyOpened = true
}
if obtained_orNil != nil {
obtained := obtained_orNil
obtained.Freq = int(C_obtained.freq)
obtained.Format = uint16(C_obtained.format)
obtained.Channels = uint8(C_obtained.channels)
obtained.Samples = uint16(C_obtained.samples)
obtained.Out_Silence = uint8(C_obtained.silence)
obtained.Out_Size = uint32(C_obtained.size)
}
return int(status)
}
func OpenAudio(desired, obtained_orNil *AudioSpec) int {
var C_desired, C_obtained *C.SDL_AudioSpec
C_desired = new(C.SDL_AudioSpec)
C_desired.freq = C.int(desired.Freq)
C_desired.format = C.Uint16(desired.Format)
C_desired.channels = C.Uint8(desired.Channels)
C_desired.samples = C.Uint16(desired.Samples)
C_desired.callback = C.callback_getCallback()
if obtained_orNil != nil {
if desired != obtained_orNil {
C_obtained = new(C.SDL_AudioSpec)
} else {
C_obtained = C_desired
}
}
status := C.SDL_OpenAudio(C_desired, C_obtained)
if status == 0 {
mutex.Lock()
opened++
mutex.Unlock()
}
if obtained_orNil != nil {
obtained := obtained_orNil
obtained.Freq = int(C_obtained.freq)
obtained.Format = uint16(C_obtained.format)
obtained.Channels = uint8(C_obtained.channels)
obtained.Samples = uint16(C_obtained.samples)
obtained.Out_Silence = uint8(C_obtained.silence)
obtained.Out_Size = uint32(C_obtained.size)
}
return int(status)
}