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pcm: initialize pcm_dmix monotonic field

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not doing so, leaves the pcm object in an inconsistent state since
'info' field is copied from the slave which is then used when
snd_pcm_hw_params_is_monotonic() is called.

For instance, when using dmix with aplay and an underrun is occuring, the following
info is returned:

underrun!!! (at least 1248687948.256 ms long)
Status:
  state       : XRUN
  trigger_time: 1390347762.628483000
  tstamp      : 1390347766.184350000
  delay       : -635
  avail       : 15687
  avail_max   : 15675

now is computed from CLOCK_MONOTONIC while pcm status tstamps are from gettimeofday().

After the fix, underruns are still occuring on my setup but at least the displayed info
is correct:

underrun!!! (at least 7630.409 ms long)
Status:
  state       : XRUN
  trigger_time: 7652.739201431
  tstamp      : 7660.369600636
  delay       : -624
  avail       : 15676
  avail_max   : 15664

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Olivier Langlois 2014-01-22 19:04:45 -05:00 • committed by Takashi Iwai
parent 336dc58beb
commit e51cd44897
2 changed files with 3 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/pcm/pcm_direct.c
View file

@ -857,6 +857,7 @@ static void save_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm)
COPY_SLAVE(buffer_time);
COPY_SLAVE(sample_bits);
COPY_SLAVE(frame_bits);
COPY_SLAVE(monotonic);
}
#undef COPY_SLAVE
@ -1220,6 +1221,7 @@ static void copy_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm)
COPY_SLAVE(buffer_time);
COPY_SLAVE(sample_bits);
COPY_SLAVE(frame_bits);
COPY_SLAVE(monotonic);
spcm->info &= ~SND_PCM_INFO_PAUSE;
spcm->boundary = recalc_boundary_size(dmix->shmptr->s.boundary, spcm->buffer_size);

2
src/pcm/pcm_dmix.c
View file

@ -1104,7 +1104,7 @@ int snd_pcm_dmix_open(snd_pcm_t **pcmp, const char *name,
pcm->poll_fd = dmix->poll_fd;
pcm->poll_events = POLLIN; /* it's different than other plugins */
pcm->monotonic = spcm->monotonic;
pcm->mmap_rw = 1;
snd_pcm_set_hw_ptr(pcm, &dmix->hw_ptr, -1, 0);
snd_pcm_set_appl_ptr(pcm, &dmix->appl_ptr, -1, 0);