[LAD] interrupt-drive ALSA returning buffers too small

Clemens Ladisch clemens at ladisch.de
Thu Sep 9 07:31:42 UTC 2010

Gabriel M. Beddingfield wrote:
> I've set alsa to wake me up every N frames.

Setting the period size makes this possible.  The avail_min parameter
only prevents waveups when less than N frames are available.

> However, when I awake, I find that I often have fewer than N frames
> available:
>    snd_pcm_sw_params_set_avail_min (playback_handle, sw_params, N)
>       err = snd_pcm_wait(playback_handle, 1000);
>       frames_to_deliver = snd_pcm_avail_update(playback_handle);
>       assert(frames_to_deliver >= N);

In theory, this should work.  Which PCM plugin (device name) are you


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