/* Mixing function */
static void mix_channels(void *udata, Uint8 *stream, int len)
{
int i;
Uint32 sdl_ticks;
#if SDL_VERSION_ATLEAST(1, 3, 0)
/* Need to initialize the stream in SDL 1.3+ */
memset(stream, mixer.silence, len);
#endif
/* Mix the music (must be done before the channels are added) */
if ( (mix_music_compat_channel.playing) && ( ! mix_music_compat_channel.paused ) ) {
if (mix_compat_music != NULL) {
mix_compat_music(music_compat_data, stream, len);
} else {
mix_music(music_data, mix_music_compat_channel.music, stream, len, MUSIC_COMPAT_MAGIC_CHANNEL);
}
}
for ( i=0; i<num_channels; ++i ) {
if ((mix_channel[i].is_music) && (mix_channel[i].playing) && ( ! mix_channel[i].paused )) {
mix_music(music_data, mix_channel[i].music, stream, len, i);
}
}
/* Mix any playing channels... */
sdl_ticks = SDL_GetTicks();
for ( i=0; i<num_channels; ++i ) {
if ((! mix_channel[i].is_music) && ( ! mix_channel[i].paused )) {
do_mix_channel(udata, stream, len, &mix_channel[i], mix_channel[i].sound, i, sdl_ticks);
}
}
/* rcg06122001 run posteffects... */
Mix_DoEffects(MIX_CHANNEL_POST, stream, len);
if ( mix_postmix ) {
mix_postmix(mix_postmix_data, stream, len);
}
}
/* Mixing function */
static void mix_channels(void *udata, Uint8 *stream, int len)
{
Uint8 *mix_input;
int i, mixable, volume = SDL_MIX_MAXVOLUME;
Uint32 sdl_ticks;
#if SDL_VERSION_ATLEAST(1, 3, 0)
/* Need to initialize the stream in SDL 1.3+ */
memset(stream, mixer.silence, len);
#endif
/* Mix the music (must be done before the channels are added) */
if ( music_active || (mix_music != music_mixer) ) {
mix_music(music_data, stream, len);
}
/* Mix any playing channels... */
sdl_ticks = SDL_GetTicks();
for ( i=0; i<num_channels; ++i ) {
if( ! mix_channel[i].paused ) {
if ( mix_channel[i].expire > 0 && mix_channel[i].expire < sdl_ticks ) {
/* Expiration delay for that channel is reached */
mix_channel[i].playing = 0;
mix_channel[i].looping = 0;
mix_channel[i].fading = MIX_NO_FADING;
mix_channel[i].expire = 0;
_Mix_channel_done_playing(i);
} else if ( mix_channel[i].fading != MIX_NO_FADING ) {
Uint32 ticks = sdl_ticks - mix_channel[i].ticks_fade;
if( ticks > mix_channel[i].fade_length ) {
Mix_Volume(i, mix_channel[i].fade_volume_reset); /* Restore the volume */
if( mix_channel[i].fading == MIX_FADING_OUT ) {
mix_channel[i].playing = 0;
mix_channel[i].looping = 0;
mix_channel[i].expire = 0;
_Mix_channel_done_playing(i);
}
mix_channel[i].fading = MIX_NO_FADING;
} else {
if( mix_channel[i].fading == MIX_FADING_OUT ) {
Mix_Volume(i, (mix_channel[i].fade_volume * (mix_channel[i].fade_length-ticks))
/ mix_channel[i].fade_length );
} else {
Mix_Volume(i, (mix_channel[i].fade_volume * ticks) / mix_channel[i].fade_length );
}
}
}
if ( mix_channel[i].playing > 0 ) {
int index = 0;
int remaining = len;
while (mix_channel[i].playing > 0 && index < len) {
remaining = len - index;
volume = (mix_channel[i].volume*mix_channel[i].chunk->volume) / MIX_MAX_VOLUME;
mixable = mix_channel[i].playing;
if ( mixable > remaining ) {
mixable = remaining;
}
mix_input = Mix_DoEffects(i, mix_channel[i].samples, mixable);
SDL_MixAudio(stream+index,mix_input,mixable,volume);
if (mix_input != mix_channel[i].samples)
SDL_free(mix_input);
mix_channel[i].samples += mixable;
mix_channel[i].playing -= mixable;
index += mixable;
/* rcg06072001 Alert app if channel is done playing. */
if (!mix_channel[i].playing && !mix_channel[i].looping) {
_Mix_channel_done_playing(i);
}
}
/* If looping the sample and we are at its end, make sure
we will still return a full buffer */
while ( mix_channel[i].looping && index < len ) {
int alen = mix_channel[i].chunk->alen;
remaining = len - index;
if (remaining > alen) {
remaining = alen;
}
mix_input = Mix_DoEffects(i, mix_channel[i].chunk->abuf, remaining);
SDL_MixAudio(stream+index, mix_input, remaining, volume);
if (mix_input != mix_channel[i].chunk->abuf)
SDL_free(mix_input);
--mix_channel[i].looping;
mix_channel[i].samples = mix_channel[i].chunk->abuf + remaining;
mix_channel[i].playing = mix_channel[i].chunk->alen - remaining;
index += remaining;
}
if ( ! mix_channel[i].playing && mix_channel[i].looping ) {
--mix_channel[i].looping;
mix_channel[i].samples = mix_channel[i].chunk->abuf;
mix_channel[i].playing = mix_channel[i].chunk->alen;
}
}
}
}
/* rcg06122001 run posteffects... */
Mix_DoEffects(MIX_CHANNEL_POST, stream, len);
if ( mix_postmix ) {
mix_postmix(mix_postmix_data, stream, len);
}
}