void myMusicPlayer(void *udata, Uint8 *stream, int len)
{
int i,act=0;
Sint16 *ptr2;
if (stream!=0) {
ptr2=(Sint16 *)stream;
if (playing_music) {
while(act<len) {
if (music_loaded[music_position]) {
/* Play a music file: */
if ((music_sound[music_position]->flags&SOUND_SAMPLEFLAG_EOF)) {
/* End of file: */
if (music_loaded[music_position+1]) {
music_position++;
} /* if */
Sound_Rewind(music_sound[music_position]);
} else {
/* In the middle of the file: */
int decoded=0;
Sint16 *ptr;
Sound_SetBufferSize(music_sound[music_position], len-act);
decoded=Sound_Decode(music_sound[music_position]);
ptr=(Sint16 *)music_sound[music_position]->buffer;
for(i=0;i<decoded;i+=2,ptr++,ptr2++) {
*ptr2=((Sint32(*ptr)*Sint32(music_volume))/127);
} /* for */
act+=decoded;
} /* if */
} else {
/* No music file loaded: */
for(i=act;i<len;i++) stream[i]=0;
act=len;
} /* if */
} /* while */
} else {
/* No music to play: */
for(i=0;i<len;i++) stream[i]=0;
} /* if */
} else {
fprintf(stderr,"ERROR in myMusicPlayer(): null music stream!!\n");
} /* if */
} /* myMusicPlayer */
/*
** Audio stream callback.
**
** Called by the SDL background thread each time the audio buffer is ready
** to receive more data. The function decodes PCM samples from the sound
** stream and copies them to the buffer for playback. When an end-of-stream
** is reached, closes the audio stream and exits cleanly.
*/
static void
stream_callback (void *userdata, Uint8 *buffer, int length)
{
Sound_Sample *stream = (Sound_Sample *) userdata;
Uint32 bytes_decoded;
/* Decode a chunk of PCM samples from the sound stream. */
Sound_SetBufferSize (stream, length);
bytes_decoded = Sound_Decode (stream);
if (bytes_decoded == 0) {
/* End-of-stream reached; exit cleanly. */
Sound_FreeSample (stream);
Sound_Quit ();
SDL_Quit ();
exit (0);
}
/* Copy the decoded samples to the audio buffer. */
memcpy (buffer, stream->buffer, length);
}
