// returns (cvt, 0/1/-1) -- 0 means no conversion, 1 means filter is set up
func BuildAudioCVT(src_format AudioFormat, src_channels uint8, src_rate int,
dst_format AudioFormat, dst_channels uint8, dst_rate int) (*AudioCVT, int) {
var cvt C.SDL_AudioCVT
ret := C.SDL_BuildAudioCVT(&cvt,
C.SDL_AudioFormat(int(src_format)), C.Uint8(src_channels), C.int(src_rate),
C.SDL_AudioFormat(int(dst_format)), C.Uint8(dst_channels), C.int(dst_rate))
rcvt := &AudioCVT{&cvt, nil}
return rcvt, int(ret)
}
func BuildAudioCVT(sf AudioFormat, sc uint8, sr int, df AudioFormat, dc uint8, dr int) (*AudioCVT, bool, error) {
var cvt AudioCVT
r := C.SDL_BuildAudioCVT(cvt.c(),
C.SDL_AudioFormat(sf),
C.Uint8(sc),
C.int(sr),
C.SDL_AudioFormat(df),
C.Uint8(dc),
C.int(dr),
)
switch r {
case 0:
return &cvt, false, nil
case 1:
return &cvt, true, nil
}
return nil, false, getError()
}
func MixAudioFormat(dst, src []byte, f AudioFormat, vol int) error {
if len(dst) != len(src) {
return errors.New("len(dst) != len(src)")
}
C.SDL_MixAudioFormat(
(*C.Uint8)(unsafe.Pointer(&dst[0])),
(*C.Uint8)(unsafe.Pointer(&src[0])),
C.SDL_AudioFormat(f),
C.Uint32(len(dst)),
C.int(vol),
)
return nil
}
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.SDL_AudioFormat(desired.Format)
C_desired.channels = C.Uint8(desired.Channels)
C_desired.samples = C.Uint16(desired.Samples)
C_desired.callback = C.SDL_AudioCallback(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
}
func (fmt AudioFormat) c() C.SDL_AudioFormat {
return C.SDL_AudioFormat(fmt)
}
func MixAudioFormat(dst, src []byte, format AudioFormat, volume int) {
C.SDL_MixAudioFormat((*C.Uint8)(unsafe.Pointer(&dst[0])), (*C.Uint8)(unsafe.Pointer(&src[0])), C.SDL_AudioFormat(int(format)), C.Uint32(len(dst)), C.int(volume))
}