On Tue, Jun 18, 2002 at 07:47:59PM +0200, dunk fordyce wrote:
> now im wondering whats the best way to play multiple samples at once?
That would require mixing the different samples (i.e. adding the pcm
values and doing clipping).
// 16-bit samples,
int16_t buf1[1024], buf2[1024], out[1024];
int32_t mix;
while (...) { // Do as long as there are samples available
// Fill buf1 and buf2 with PCM data from different samples
for (int c=0; c < 1024; c++) {
mix = buf1[c] + buf2[c];
if (mix > 32768)
out[c] = 32768;
else if (mix < -32767)
out[c] = -32767;
else out[c] = (int16_t)mix;
}
snd_pcm_writei(sound_handle, out, sizeof(out));
}
The above is just psuedo code. You can also look at somethink like JACK
(http://jackit.sf.net) if you prefer a callback driven interface.
Good luck,
Andy
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