/* Load a wave file */
Mix_Chunk *Mix_LoadWAV_RW(SDL_RWops *src, int freesrc)
{
Uint32 magic;
Mix_Chunk *chunk;
SDL_AudioSpec wavespec, *loaded;
SDL_AudioCVT wavecvt;
int samplesize;
/* rcg06012001 Make sure src is valid */
if ( ! src ) {
SDL_SetError("Mix_LoadWAV_RW with NULL src");
return(NULL);
}
/* Make sure audio has been opened */
if ( ! audio_opened ) {
SDL_SetError("Audio device hasn't been opened");
if ( freesrc ) {
SDL_RWclose(src);
}
return(NULL);
}
/* Allocate the chunk memory */
chunk = (Mix_Chunk *)SDL_malloc(sizeof(Mix_Chunk));
if ( chunk == NULL ) {
SDL_SetError("Out of memory");
if ( freesrc ) {
SDL_RWclose(src);
}
return(NULL);
}
/* Find out what kind of audio file this is */
magic = SDL_ReadLE32(src);
/* Seek backwards for compatibility with older loaders */
SDL_RWseek(src, -(int)sizeof(Uint32), RW_SEEK_CUR);
switch (magic) {
case WAVE:
case RIFF:
loaded = SDL_LoadWAV_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
case FORM:
loaded = Mix_LoadAIFF_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
#ifdef OGG_MUSIC
case OGGS:
loaded = Mix_LoadOGG_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
#endif
#ifdef FLAC_MUSIC
case FLAC:
loaded = Mix_LoadFLAC_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
#endif
case CREA:
loaded = Mix_LoadVOC_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
default:
#if defined(MP3_MUSIC) || defined(MP3_MAD_MUSIC)
if (detect_mp3((Uint8*)&magic))
{
/* note: send a copy of the mixer spec */
wavespec = mixer;
loaded = Mix_LoadMP3_RW(src, freesrc, &wavespec,
(Uint8 **)&chunk->abuf, &chunk->alen);
break;
}
#endif
SDL_SetError("Unrecognized sound file type");
if ( freesrc ) {
SDL_RWclose(src);
}
loaded = NULL;
break;
}
if ( !loaded ) {
/* The individual loaders have closed src if needed */
SDL_free(chunk);
return(NULL);
}
#if 0
PrintFormat("Audio device", &mixer);
PrintFormat("-- Wave file", &wavespec);
#endif
/* Build the audio converter and create conversion buffers */
if ( wavespec.format != mixer.format ||
wavespec.channels != mixer.channels ||
wavespec.freq != mixer.freq ) {
if ( SDL_BuildAudioCVT(&wavecvt,
wavespec.format, wavespec.channels, wavespec.freq,
mixer.format, mixer.channels, mixer.freq) < 0 ) {
SDL_free(chunk->abuf);
SDL_free(chunk);
return(NULL);
}
samplesize = ((wavespec.format & 0xFF)/8)*wavespec.channels;
wavecvt.len = chunk->alen & ~(samplesize-1);
wavecvt.buf = (Uint8 *)SDL_calloc(1, wavecvt.len*wavecvt.len_mult);
if ( wavecvt.buf == NULL ) {
SDL_SetError("Out of memory");
SDL_free(chunk->abuf);
SDL_free(chunk);
return(NULL);
}
SDL_memcpy(wavecvt.buf, chunk->abuf, chunk->alen);
SDL_free(chunk->abuf);
/* Run the audio converter */
if ( SDL_ConvertAudio(&wavecvt) < 0 ) {
SDL_free(wavecvt.buf);
SDL_free(chunk);
return(NULL);
}
chunk->abuf = wavecvt.buf;
chunk->alen = wavecvt.len_cvt;
}
chunk->allocated = 1;
chunk->volume = MIX_MAX_VOLUME;
return(chunk);
}
static int lua_Mix_Load(State & state){
Stack * stack = state.stack;
if (stack->is<LUA_TSTRING>(1)){
AudioSpec * interfaceAS = state.getInterface<AudioSpec>("LuaSDL_AudioSpec");
SDL_AudioSpec * inputSpec = interfaceAS->get(2);
if (inputSpec){
const std::string filename = stack->toLString(1);
SDL_RWops * src = SDL_RWFromFile(filename.c_str(), "rb");
if (!src){
state.error("Couldn't open audio file: %s\n", filename.c_str());
}
Uint32 magic;
SDL_AudioSpec wavespec, *audiospec = nullptr;
Uint8 *abuf = nullptr;
Uint32 alen;
/* note: send a copy of the mixer spec */
wavespec = *inputSpec;
/* Find out what kind of audio file this is */
magic = SDL_ReadLE32(src);
/* Seek backwards for compatibility with older loaders */
SDL_RWseek(src, -(int)sizeof(Uint32), RW_SEEK_CUR);
switch (magic) {
case WAVE:
case RIFF:
audiospec = SDL_LoadWAV_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
case FORM:
audiospec = Mix_LoadAIFF_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
case OGGS:
audiospec = Mix_LoadOGG_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
case FLAC:
audiospec = Mix_LoadFLAC_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
case CREA:
audiospec = Mix_LoadVOC_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
default:
if (detect_mp3((Uint8*)&magic)) {
audiospec = Mix_LoadMP3_RW(src, 0, &wavespec,
(Uint8 **)&abuf, &alen);
break;
}
break;
}
SDL_RWclose(src);
if (audiospec) {
stack->pushLString(std::string(reinterpret_cast<char*>(abuf), alen));
interfaceAS->push(audiospec, true);
return 2;
}
else{
state.error("Unreckonized audio file\n");
}
}
}
return 0;
}