[alsa-devel] Trouble understanding ALSA's DMA buffers
timur at freescale.com
Tue Jun 12 18:36:33 CEST 2007
Takashi Iwai wrote:
> Yes. And the "ping-poing" is the case that you have two periods in a
> ring buffer.
Ok, I understand the 'periods' concept now, thanks.
So when/where does ALSA copy data to the DMA buffer? Isn't there supposed to be some kind
of callback where ALSA calls the driver and says, "here's some data, please copy it to
your DMA buffer?"
Or does ALSA do all the copying itself whenever the driver calls snd_pcm_period_elapsed()?
Linux Kernel Developer @ Freescale
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