void speaker_device::mix(INT32 *leftmix, INT32 *rightmix, int &samples_this_update, bool suppress)
{
// skip if no stream
if (m_mixer_stream == NULL)
return;
// update the stream, getting the start/end pointers around the operation
int numsamples;
const stream_sample_t *stream_buf = stream_get_output_since_last_update(m_mixer_stream, 0, &numsamples);
// set or assert that all streams have the same count
if (samples_this_update == 0)
{
samples_this_update = numsamples;
/* reset the mixing streams */
memset(leftmix, 0, samples_this_update * sizeof(*leftmix));
memset(rightmix, 0, samples_this_update * sizeof(*rightmix));
}
assert(samples_this_update == numsamples);
#ifdef MAME_DEBUG
// debug version: keep track of the maximum sample
for (int sample = 0; sample < samples_this_update; sample++)
{
if (stream_buf[sample] > m_max_sample)
m_max_sample = stream_buf[sample];
else if (-stream_buf[sample] > m_max_sample)
m_max_sample = -stream_buf[sample];
if (stream_buf[sample] > 32767 || stream_buf[sample] < -32768)
m_clipped_samples++;
m_total_samples++;
}
#endif
// mix if sound is enabled
if (!suppress)
{
// if the speaker is centered, send to both left and right
if (m_config.m_x == 0)
for (int sample = 0; sample < samples_this_update; sample++)
{
leftmix[sample] += stream_buf[sample];
rightmix[sample] += stream_buf[sample];
}
// if the speaker is to the left, send only to the left
else if (m_config.m_x < 0)
for (int sample = 0; sample < samples_this_update; sample++)
leftmix[sample] += stream_buf[sample];
// if the speaker is to the right, send only to the right
else
for (int sample = 0; sample < samples_this_update; sample++)
rightmix[sample] += stream_buf[sample];
}
}
static TIMER_CALLBACK( sound_update )
{
UINT32 finalmix_step, finalmix_offset;
int samples_this_update = 0;
int sample, spknum;
VPRINTF(("sound_update\n"));
profiler_mark(PROFILER_SOUND);
/* force all the speaker streams to generate the proper number of samples */
for (spknum = 0; spknum < totalspeakers; spknum++)
{
speaker_info *spk = &speaker[spknum];
const stream_sample_t *stream_buf;
/* get the output buffer */
if (spk->mixer_stream != NULL)
{
int numsamples;
/* update the stream, getting the start/end pointers around the operation */
stream_buf = stream_get_output_since_last_update(spk->mixer_stream, 0, &numsamples);
/* set or assert that all streams have the same count */
if (samples_this_update == 0)
{
samples_this_update = numsamples;
/* reset the mixing streams */
memset(leftmix, 0, samples_this_update * sizeof(*leftmix));
memset(rightmix, 0, samples_this_update * sizeof(*rightmix));
}
assert(samples_this_update == numsamples);
#ifdef MAME_DEBUG
/* debug version: keep track of the maximum sample */
for (sample = 0; sample < samples_this_update; sample++)
{
if (stream_buf[sample] > spk->max_sample)
spk->max_sample = stream_buf[sample];
else if (-stream_buf[sample] > spk->max_sample)
spk->max_sample = -stream_buf[sample];
if (stream_buf[sample] > 32767 || stream_buf[sample] < -32768)
spk->clipped_samples++;
spk->total_samples++;
}
#endif
/* mix if sound is enabled */
if (global_sound_enabled && !nosound_mode)
{
/* if the speaker is centered, send to both left and right */
if (spk->speaker->x == 0)
for (sample = 0; sample < samples_this_update; sample++)
{
leftmix[sample] += stream_buf[sample];
rightmix[sample] += stream_buf[sample];
}
/* if the speaker is to the left, send only to the left */
else if (spk->speaker->x < 0)
for (sample = 0; sample < samples_this_update; sample++)
leftmix[sample] += stream_buf[sample];
/* if the speaker is to the right, send only to the right */
else
for (sample = 0; sample < samples_this_update; sample++)
rightmix[sample] += stream_buf[sample];
}
}
}
/* now downmix the final result */
finalmix_step = video_get_speed_factor();
finalmix_offset = 0;
for (sample = finalmix_leftover; sample < samples_this_update * 100; sample += finalmix_step)
{
int sampindex = sample / 100;
INT32 samp;
/* clamp the left side */
samp = leftmix[sampindex];
if (samp < -32768)
samp = -32768;
else if (samp > 32767)
samp = 32767;
finalmix[finalmix_offset++] = samp;
/* clamp the right side */
samp = rightmix[sampindex];
if (samp < -32768)
samp = -32768;
else if (samp > 32767)
samp = 32767;
finalmix[finalmix_offset++] = samp;
}
finalmix_leftover = sample - samples_this_update * 100;
/* play the result */
if (finalmix_offset > 0)
{
osd_update_audio_stream(finalmix, finalmix_offset / 2);
if (wavfile != NULL)
wav_add_data_16(wavfile, finalmix, finalmix_offset);
}
/* update the streamer */
streams_update(machine);
profiler_mark(PROFILER_END);
}
