Provided by: linux-doc-2.6.15_2.6.15-23.39_all
snd_pcm_period_elapsed - update the pcm status for the next period
void snd_pcm_period_elapsed (snd_pcm_substream_t * substream);
the pcm substream instance
This function is called from the interrupt handler when the PCM has
processed the period size. It will update the current pointer, set up
the tick, wake up sleepers, etc.
Even if more than one periods have elapsed since the last call, you
have to call this only once.