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pcm: file: update linked hw_ptr and appl_ptr

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Plugin file provides no private hw_ptr and appl_ptr but instead links
them to the slave pcm.  If the slave pcm itself changes its hw_ptr or
app_prt this needs to be done in file plugin, too.

Plugin 'plug' is such a candidate changing the hw_ptr and app_ptr in
hw_params call dependent on the automatically inserted plugins.  ALSA
unfortunately has no support for automatically updating chained
pointers.

A notification on pointer change seems to be prepared inside the
snd_pcm_set_ptr() routine via rbptr->changed(), but it is not (yet)
implemented so that we need to care for it manually.

Signed-off-by: Andreas Pape <apape@de.adit-jv.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andreas Pape 2016-11-25 15:55:05 +05:30 • committed by Takashi Iwai
parent e1e211208a
commit ada1eb4139
1 changed files with 8 additions and 0 deletions
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8
src/pcm/pcm_file.c
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@ -642,6 +642,14 @@ static int snd_pcm_file_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
return err;
}
}
/* pointer may have changed - e.g if plug is used. */
snd_pcm_unlink_hw_ptr(pcm, file->gen.slave);
snd_pcm_unlink_appl_ptr(pcm, file->gen.slave);
snd_pcm_link_hw_ptr(pcm, file->gen.slave);
snd_pcm_link_appl_ptr(pcm, file->gen.slave);
return 0;
}