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Add snd_{ctl|pcm}_open_fallback() functions

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This patch adds new API functions, snd_ctl_open_fallback() and
snd_pcm_open_fallback().  These are just like snd_*_open_lconf() but
used to open a fallback PCM/control.  The difference is that it replaces
the name string with the given original name, so that hctl and other
upper-layers will recognize it as an alias.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2011-07-26 13:10:24 +02:00
parent e6f990e5c9
commit acb423d937
4 changed files with 50 additions and 0 deletions
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24
src/pcm/pcm.c
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@ -2259,6 +2259,30 @@ int snd_pcm_open_lconf(snd_pcm_t **pcmp, const char *name,
return snd_pcm_open_noupdate(pcmp, lconf, name, stream, mode, 0);
}
/**
* \brief Opens a fallback PCM
* \param pcmp Returned PCM handle
* \param root Configuration root
* \param name ASCII identifier of the PCM handle
* \param orig_name The original ASCII name
* \param stream Wanted stream
* \param mode Open mode (see #SND_PCM_NONBLOCK, #SND_PCM_ASYNC)
* \return 0 on success otherwise a negative error code
*/
int snd_pcm_open_fallback(snd_pcm_t **pcmp, snd_config_t *root,
const char *name, const char *orig_name,
snd_pcm_stream_t stream, int mode)
{
int err;
assert(pcmp && name && root);
err = snd_pcm_open_noupdate(pcmp, root, name, stream, mode, 0);
if (err >= 0) {
free((*pcmp)->name);
(*pcmp)->name = orig_name ? strdup(orig_name) : NULL;
}
return err;
}
#ifndef DOC_HIDDEN
int snd_pcm_new(snd_pcm_t **pcmp, snd_pcm_type_t type, const char *name,
snd_pcm_stream_t stream, int mode)