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alsa-lib - added pcm_errors section

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Jaroslav Kysela 2006-03-15 12:22:29 +00:00
parent f032a8cf3f
commit 36eb137f69
1 changed files with 23 additions and 0 deletions
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23
src/pcm/pcm.c
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@ -259,6 +259,29 @@ See the #snd_pcm_mmap_readi(),
#snd_pcm_writei(), #snd_pcm_readn()
and #snd_pcm_writen() functions.
\section pcm_errors Error codes
\par -EPIPE
This error means xrun (underrun for playback or overrun for capture).
The underrun can happen when an application does not feed new samples
in time to alsa-lib (due CPU usage). The overrun can happen when
an application does not take new captured samples in time from alsa-lib.
\par -ESTRPIPE
This error means that system has suspended drivers. The application
should wait in loop when snd_pcm_resume() != -EAGAIN and then
call snd_pcm_prepare() when snd_pcm_resume() return an error code.
If snd_pcm_resume() does not fail (a zero value is returned), driver
supports resume and the snd_pcm_prepare() call can be ommited.
\par -EBADFD
This error can happen when device is physically removed (for example
some hotplug devices like USB or PCMCIA, CardBus or ExpressCard
can be removed on the fly).
\section pcm_params Managing parameters
The ALSA PCM device uses two groups of PCM related parameters. The hardware