[alsa-devel] Handle large period size end-of-stream situation

Clemens Ladisch clemens at ladisch.de
Thu Apr 4 19:08:45 CEST 2013

Gabriel M. Beddingfield wrote:
> So, if the hardware can detect it then the hardware needs to signal an interrupt for the XRUN.

The hardware typically doesn't know the application pointer.

> Another option... from userspace you can call SYNC_PTR (e.g.
> pcm_get_htimestamp() in tinyalsa) to update the hw and application
> pointers, then inspect them to detect when all the data is transferred.
> When you see all is played, immediately stop the stream.

ALSA checks for xruns before returning the pointer.  It's enough to just
ask for the pointer (or the state).


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