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ALSA: pcm - Use UNKNOWN chmap for mono streams 

In general, mono streams have no dedicated speaker assignment, thus
they should be rather marked as UNKNOWN position.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-09-11 14:24:43 +02:00
Родитель 498dab3aa7
Коммит 2dc6fbf007
1 изменённых файлов: 2 добавлений и 2 удалений
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4
sound/core/pcm_lib.c
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@ -2311,7 +2311,7 @@ EXPORT_SYMBOL(snd_pcm_lib_readv);
/* default channel maps for multi-channel playbacks, up to 8 channels */ /* default channel maps for multi-channel playbacks, up to 8 channels */
const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = { const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
{ .channels = 1, { .channels = 1,
.map = { SNDRV_CHMAP_FC } }, .map = { SNDRV_CHMAP_UNKNOWN } },
{ .channels = 2, { .channels = 2,
.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } }, .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
{ .channels = 4, { .channels = 4,
@ -2333,7 +2333,7 @@ EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */ /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = { const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
{ .channels = 1, { .channels = 1,
.map = { SNDRV_CHMAP_FC } }, .map = { SNDRV_CHMAP_UNKNOWN } },
{ .channels = 2, { .channels = 2,
.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } }, .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
{ .channels = 4, { .channels = 4,