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 Init() {
if ok := C.SDL_InitSubSystem(C.SDL_INIT_AUDIO); ok < 0 {
panic(ok)
}
var want C.SDL_AudioSpec
want.freq = 48000
want.format = C.AUDIO_S16
want.channels = 2
want.callback = (C.SDL_AudioCallback)(unsafe.Pointer(C.audio_callback_go_cgo))
var have C.SDL_AudioSpec
if dev = C.SDL_OpenAudioDevice(nil, 0, &want, &have, 0); dev == 0 {
panic("dev=0")
}
}
func OpenAudio(desired, obtained *AudioSpec, callback func(*byte, int)) bool {
var cdesired C.SDL_AudioSpec
var cobtained C.SDL_AudioSpec
cdesired.freq = C.int(desired.Freq)
cdesired.format = C.SDL_AudioFormat(int(desired.Format))
cdesired.channels = C.Uint8(desired.Channels)
cdesired.samples = C.Uint16(desired.Samples)
cdesired.size = C.Uint32(0)
cdesired.callback = C.go_sdl2_get_callback()
cdesired.userdata = unsafe.Pointer(&callback)
ret := C.SDL_OpenAudio(&cdesired, &cobtained)
if obtained != nil {
obtained.Freq = int32(cobtained.freq)
obtained.Format = AudioFormat(int(cobtained.format))
obtained.Channels = uint8(cobtained.channels)
obtained.Silence = uint8(cobtained.silence)
obtained.Samples = uint16(cobtained.samples)
obtained.Size = uint32(cobtained.size)
}
return int(ret) == 0
}
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)
}
func OpenAudioDevice(device string, iscapture bool, desired, obtained *AudioSpec, allowed_changes bool, callback func(*byte, int)) bool {
var cdesired C.SDL_AudioSpec
var cobtained C.SDL_AudioSpec
cdevice := C.CString(device)
defer C.free(unsafe.Pointer(cdevice))
cdesired.freq = C.int(desired.Freq)
cdesired.format = C.SDL_AudioFormat(int(desired.Format))
cdesired.channels = C.Uint8(desired.Channels)
cdesired.samples = C.Uint16(desired.Samples)
cdesired.size = C.Uint32(0)
cdesired.callback = C.go_sdl2_get_callback()
cdesired.userdata = unsafe.Pointer(&callback)
ret := C.SDL_OpenAudioDevice(cdevice, C.int(bool2int(iscapture)), &cdesired, &cobtained, C.int(bool2int(allowed_changes)))
if obtained != nil {
obtained.Freq = int32(cobtained.freq)
obtained.Format = AudioFormat(int(cobtained.format))
obtained.Channels = uint8(cobtained.channels)
obtained.Silence = uint8(cobtained.silence)
obtained.Samples = uint16(cobtained.samples)
obtained.Size = uint32(cobtained.size)
}
return int(ret) == 0
}