[alsa-devel] snd_pcm_drain and partial periods

[Clemens Ladisch]

Trent Piepho wrote:
> When the driver schedules the final period, couldn't it check if the
> device is draining, and if so try to end playback at the right time.

The ALSA framework was designed for cards where DMA doesn't need to
be scheduled continuously, so it is assumed that stopping happens
asynchronously.

You could try to check the PCM state, but it's possible that the call
to snd_pcm_drain() happens after you've scheduled the final period.


Regards,
Clemens