/* Mixing function */
void music_mixer(void *udata, Uint8 *stream, int len)
{
int left = 0;
if ( music_playing && music_active ) {
/* Handle fading */
if ( music_playing->fading != MIX_NO_FADING ) {
if ( music_playing->fade_step++ < music_playing->fade_steps ) {
int volume;
int fade_step = music_playing->fade_step;
int fade_steps = music_playing->fade_steps;
if ( music_playing->fading == MIX_FADING_OUT ) {
volume = (music_volume * (fade_steps-fade_step)) / fade_steps;
} else { /* Fading in */
volume = (music_volume * fade_step) / fade_steps;
}
music_internal_volume(volume);
} else {
if ( music_playing->fading == MIX_FADING_OUT ) {
music_internal_halt();
if ( music_finished_hook ) {
music_finished_hook();
}
return;
}
music_playing->fading = MIX_NO_FADING;
}
}
if (music_halt_or_loop() == 0)
return;
switch (music_playing->type) {
#ifdef CMD_MUSIC
case MUS_CMD:
/* The playing is done externally */
break;
#endif
#ifdef WAV_MUSIC
case MUS_WAV:
left = WAVStream_PlaySome(stream, len);
break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
left = MOD_playAudio(music_playing->data.module, stream, len);
break;
#endif
#ifdef MID_MUSIC
#ifdef USE_TIMIDITY_MIDI
case MUS_MID:
if ( timidity_ok ) {
int samples = len / samplesize;
Timidity_PlaySome(stream, samples);
}
break;
#endif
#endif
#ifdef OGG_MUSIC
case MUS_OGG:
left = OGG_playAudio(music_playing->data.ogg, stream, len);
break;
#endif
#ifdef FLAC_MUSIC
case MUS_FLAC:
left = FLAC_playAudio(music_playing->data.flac, stream, len);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
left = (len - smpeg.SMPEG_playAudio(music_playing->data.mp3, stream, len));
break;
#endif
#ifdef MP3_MAD_MUSIC
case MUS_MP3_MAD:
left = mad_getSamples(music_playing->data.mp3_mad, stream, len);
break;
#endif
default:
/* Unknown music type?? */
break;
}
}
/* Handle seamless music looping */
if (left > 0 && left < len && music_halt_or_loop()) {
music_mixer(udata, stream+(len-left), left);
}
}
SDL_AudioSpec *Mix_LoadMP3_RW(SDL_RWops *src, int freesrc, SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len)
{
/* note: spec is initialized to mixer spec */
#if defined(MP3_MUSIC)
SMPEG* mp3 = 0;
SMPEG_Info info;
#elif defined(MP3_MAD_MUSIC)
mad_data *mp3_mad;
#endif
long samplesize;
int read_len;
const Uint32 chunk_len = 4096;
int err = 0;
if ((!src) || (!spec) || (!audio_buf) || (!audio_len))
{
return NULL;
}
if (!err)
{
*audio_len = 0;
*audio_buf = (Uint8*) SDL_malloc(chunk_len);
err = (*audio_buf == NULL);
}
if (!err)
{
err = ((Mix_Init(MIX_INIT_MP3) & MIX_INIT_MP3) == 0);
}
if (!err)
{
#if defined(MP3_MUSIC)
mp3 = smpeg.SMPEG_new_rwops(src, &info, freesrc, 0);
err = (mp3 == NULL);
#elif defined(MP3_MAD_MUSIC)
mp3_mad = mad_openFileRW(src, spec, freesrc);
err = (mp3_mad == NULL);
#endif
}
#if defined(MP3_MUSIC)
if (!err)
{
err = !info.has_audio;
}
#endif
if (!err)
{
#if defined(MP3_MUSIC)
smpeg.SMPEG_actualSpec(mp3, spec);
smpeg.SMPEG_enableaudio(mp3, 1);
smpeg.SMPEG_enablevideo(mp3, 0);
smpeg.SMPEG_play(mp3);
/* read once for audio length */
while ((read_len = smpeg.SMPEG_playAudio(mp3, *audio_buf, chunk_len)) > 0)
{
*audio_len += read_len;
}
smpeg.SMPEG_stop(mp3);
#elif defined(MP3_MAD_MUSIC)
mad_start(mp3_mad);
/* read once for audio length */
while ((read_len = mad_getSamples(mp3_mad, *audio_buf, chunk_len)) > 0)
{
*audio_len += read_len;
}
mad_stop(mp3_mad);
#endif
err = (read_len < 0);
}
if (!err)
{
/* reallocate, if needed */
if ((*audio_len > 0) && (*audio_len != chunk_len))
{
*audio_buf = (Uint8*) SDL_realloc(*audio_buf, *audio_len);
err = (*audio_buf == NULL);
}
}
if (!err)
{
/* read again for audio buffer, if needed */
if (*audio_len > chunk_len)
{
#if defined(MP3_MUSIC)
smpeg.SMPEG_rewind(mp3);
smpeg.SMPEG_play(mp3);
err = (*audio_len != smpeg.SMPEG_playAudio(mp3, *audio_buf, *audio_len));
smpeg.SMPEG_stop(mp3);
#elif defined(MP3_MAD_MUSIC)
mad_seek(mp3_mad, 0);
mad_start(mp3_mad);
err = (*audio_len != mad_getSamples(mp3_mad, *audio_buf, *audio_len));
mad_stop(mp3_mad);
#endif
}
}
if (!err)
{
/* Don't return a buffer that isn't a multiple of samplesize */
samplesize = ((spec->format & 0xFF)/8)*spec->channels;
*audio_len &= ~(samplesize-1);
}
#if defined(MP3_MUSIC)
if (mp3)
{
smpeg.SMPEG_delete(mp3); mp3 = NULL;
/* Deleting the MP3 closed the source if desired */
freesrc = SDL_FALSE;
}
#elif defined(MP3_MAD_MUSIC)
if (mp3_mad)
{
mad_closeFile(mp3_mad); mp3_mad = NULL;
/* Deleting the MP3 closed the source if desired */
freesrc = SDL_FALSE;
}
#endif
if (freesrc)
{
SDL_RWclose(src); src = NULL;
}
/* handle error */
if (err)
{
if (*audio_buf != NULL)
{
SDL_free(*audio_buf); *audio_buf = NULL;
}
*audio_len = 0;
spec = NULL;
}
return spec;
}
