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chmap: Always succeed setting the map to what it already is

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If we try to set the channel map to what it already is, this should
always succeed. E g, speaker-test can do this sometimes.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2013-06-05 16:52:10 +02:00 • committed by Takashi Iwai
parent ca487c9511
commit d20e24e5d1
1 changed files with 11 additions and 0 deletions
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11
src/pcm/pcm.c
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@ -7361,6 +7361,13 @@ OBSOLETE1(snd_pcm_sw_params_get_silence_size, ALSA_0.9, ALSA_0.9.0rc4);
#endif /* DOC_HIDDEN */
static int chmap_equal(const snd_pcm_chmap_t *a, const snd_pcm_chmap_t *b)
{
if (a->channels != b->channels)
return 0;
return !memcmp(a->pos, b->pos, a->channels * sizeof(a->pos[0]));
}
/**
* \!brief Query the available channel maps
* \param pcm PCM handle to query
@ -7415,6 +7422,10 @@ snd_pcm_chmap_t *snd_pcm_get_chmap(snd_pcm_t *pcm)
*/
int snd_pcm_set_chmap(snd_pcm_t *pcm, const snd_pcm_chmap_t *map)
{
const snd_pcm_chmap_t *oldmap = snd_pcm_get_chmap(pcm);
if (oldmap && chmap_equal(oldmap, map))
return 0;
if (!pcm->ops->set_chmap)
return -ENXIO;
return pcm->ops->set_chmap(pcm, map);