[alsa-devel] XRUN handling

melwyn lobo linux.melwyn at gmail.com
Tue Jul 6 07:03:57 CEST 2010

Hi all,
I have noticed when an Xrun occurs, the bytes between the hw_ptr and
appl_ptr are not copied when both hw and appl pointers are reset in
Consider the following parameters:
  buffer_size  : 22352
  period_size  : 1016
  period_time  : 23038
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 1016
  period_event : 0
  start_threshold  : 22352
  stop_threshold   : 22352
  silence_threshold: 0
  silence_size : 0

In case snd_pcm_playback_avail() is less than stop threshold but
greater than 0, then these bytes are missing after Xrun prepare and
start stage.

Is my analysis correct? If so how do we ensure correct behaviour ie
byte accuracy after Xrun.


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