void start_sound()
{
while(read_sound_int(&SOUNDSTATUS->mode) != MODE_PLAY) {
memset4((void*)RING_BUF, 0, SAMPLES_TO_BYTES(RING_BUFFER_SAMPLES+1));
memset4((void*)RING_BUF+STEREO_OFFSET, 0, SAMPLES_TO_BYTES(RING_BUFFER_SAMPLES+1));
do_sound_command(CMD_SET_MODE(MODE_PLAY));
}
}
void SSRunMixer(void)
{
int bytes_copied;
int bytestogo;
int c;
int i;
int pos = read_sound_int(&SOUNDSTATUS->samplepos);
memset(tmp_sound_buffer, 0, sizeof(tmp_sound_buffer));
const int len = 2*SAMPLES_TO_BYTES(AUDIO_SIZE);
// get data for all channels and add it to the mix
for(c=0;c<SS_NUM_CHANNELS;c++)
{
if (channel[c].head==channel[c].tail) continue;
bytestogo = len;
mix_pos = 0;
while(bytestogo > 0)
{
bytes_copied = AddBuffer(&channel[c], bytestogo);
bytestogo -= bytes_copied;
if (channel[c].head==channel[c].tail)
{ // ran out of chunks before buffer full
// clear remaining portion of mixbuffer
if (bytestogo)
{
memset(&mixbuffer[mix_pos], 0, bytestogo);
}
break;
}
}
MixAudio(tmp_sound_buffer, mixbuffer, len, channel[c].volume);
}
// tell any callbacks that had a chunk finish, that their chunk finished
for(c=0;c<SS_NUM_CHANNELS;c++)
{
if (channel[c].FinishedCB)
{
for(i=0;i<channel[c].nFinishedChunks;i++)
{
//stat("Telling channel %d's handler that chunk %d finished", c, channel[c].FinishedChunkUserdata[i]);
(*channel[c].FinishedCB)(c, channel[c].FinishedChunkUserdata[i]);
}
}
channel[c].nFinishedChunks = 0;
}
memcpy4s(RING_BUF + pos, tmp_sound_buffer, SAMPLES_TO_BYTES(AUDIO_SIZE));
}
static void wait_sound_command(int n)
{
while(read_sound_int(&SOUNDSTATUS->cmdstatus)!=n);
}
void stop_sound()
{
while(read_sound_int(&SOUNDSTATUS->mode) != MODE_PAUSE)
do_sound_command(CMD_SET_MODE(MODE_PAUSE));
}
