// This function takes a source format and rate and a destination format
// and rate, and initializes the 'cvt' structure with information needed
// by SDL_ConvertAudio() to convert a buffer of audio data from one format
// to the other.
// This function returns 0, or -1 if there was an error.
func BuildAudioCVT(cvt *C.SDL_AudioCVT,
src_format C.Uint16, src_channels C.Uint8, src_rate C.int,
dst_format C.Uint16, dst_channels C.Uint8, dst_rate C.int) C.int {
return C.SDL_BuildAudioCVT(cvt, src_format, src_channels, src_rate,
dst_format, dst_channels, dst_rate)
}
// BuildAudioCVT (https://wiki.libsdl.org/SDL_BuildAudioCVT)
func BuildAudioCVT(cvt *AudioCVT, srcFormat AudioFormat, srcChannels uint8, srcRate int, dstFormat AudioFormat, dstChannels uint8, dstRate int) (converted bool, err error) {
switch int(C.SDL_BuildAudioCVT(cvt.cptr(), srcFormat.c(), C.Uint8(srcChannels), C.int(srcRate), dstFormat.c(), C.Uint8(dstChannels), C.int(dstRate))) {
case 1:
return true, nil
case 0:
return false, nil
}
return false, GetError()
}
// 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(cvt *AudioCVT, src_format AudioFormat, src_channels uint8, src_rate int,
dst_format AudioFormat, dst_channels uint8, dst_rate int) int {
_cvt := (*C.SDL_AudioCVT)(unsafe.Pointer(cvt))
_src_format := (C.SDL_AudioFormat)(src_format)
_src_channels := (C.Uint8)(src_channels)
_src_rate := (C.int)(src_rate)
_dst_format := (C.SDL_AudioFormat)(dst_format)
_dst_channels := (C.Uint8)(dst_channels)
_dst_rate := (C.int)(dst_rate)
return (int)(C.SDL_BuildAudioCVT(_cvt, _src_format, _src_channels, _src_rate,
_dst_format, _dst_channels, _dst_rate))
}
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()
}
// Convert converts audio to the opened audio spec, returning the data and it's length.
func convert(s *C.SDL_AudioSpec, data *C.Uint8, len C.Uint32) (*C.Uint8, C.Uint32, error) {
var cvt C.SDL_AudioCVT
o := openedSpec
switch C.SDL_BuildAudioCVT(&cvt, s.format, s.channels, s.freq, o.format, o.channels, o.freq) {
case -1:
return nil, 0, errors.New("Cannot convert audio")
case 0:
return data, len, nil
}
buf := C.malloc(C.size_t(len) * C.size_t(cvt.len_mult))
cvt.buf = (*C.Uint8)(buf)
cvt.len = C.int(len)
C.memcpy(buf, unsafe.Pointer(data), C.size_t(len))
C.free(unsafe.Pointer(data))
if C.SDL_ConvertAudio(&cvt) < 0 {
return nil, 0, sdlError()
}
return cvt.buf, C.Uint32(cvt.len), nil
}
// BuildAudioCVT (https://wiki.libsdl.org/SDL_BuildAudioCVT)
func BuildAudioCVT(cvt *AudioCVT, srcFormat AudioFormat, srcChannels uint8, srcRate int, dstFormat AudioFormat, dstChannels uint8, dstRate int) int {
return int(C.SDL_BuildAudioCVT(cvt.cptr(), srcFormat.c(), C.Uint8(srcChannels), C.int(srcRate), dstFormat.c(), C.Uint8(dstChannels), C.int(dstRate)))
}