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use default alsa channel map for alsa devices

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@851 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-05-13 20:29:32 +00:00
parent afdec0532f
commit b6812029ba
4 changed files with 74 additions and 2 deletions
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44
src/modules/alsa-util.c
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@ -340,3 +340,47 @@ snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name) {
return elem;
}
pa_channel_map* pa_alsa_channel_map_init_auto(pa_channel_map *m, unsigned channels) {
assert(m);
assert(channels > 0);
assert(channels <= PA_CHANNELS_MAX);
pa_channel_map_init(m);
m->channels = channels;
/* The standard ALSA channel order */
switch (channels) {
case 1:
m->map[0] = PA_CHANNEL_POSITION_MONO;
return m;
case 8:
m->map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
m->map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
/* Fall through */
case 6:
m->map[5] = PA_CHANNEL_POSITION_LFE;
/* Fall through */
case 5:
m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
/* Fall through */
case 4:
m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
/* Fall through */
case 2:
m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
return m;
default:
return NULL;
}
}