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alsa_mixer: add mixer_index option 

This allows you to select controls with duplicate names.
This commit is contained in:
Daniel Kahn Gillmor 2009-04-28 09:15:48 +02:00 committed by Max Kellermann
parent 70d322b296
commit 05dfdfdb39
4 changed files with 16 additions and 2 deletions
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2
NEWS
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@ -50,6 +50,8 @@ ver 0.15 (200?/??/??)
* mixers:
- rewritten mixer code to support multiple mixers
- new pulseaudio mixer
- alsa: new mixer_index option supports choosing between multiple
identically-named controls on a device.
* Add audio archive extraction support:
- bzip2
- iso9660

6
doc/mpd.conf.5
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@ -293,6 +293,12 @@ This specifies which mixer control to use (sometimes referred to as the
"device"). Examples of mixer controls are PCM, Line1, Master, etc. An example
for OSS is "Pcm", and an example for alsa is "PCM".
.TP
.B mixer_index <mixer index>
A number identifying the index of the named mixer control. This is
probably only useful if your alsa device has more than one
identically\-named mixer control. The default is "0". (Use "amixer
scontrols" to see the list of controls with their indexes)
.TP
.B use_mmap <yes or no>
Setting this allows you to use memory-mapped I/O. Certain hardware setups may
benefit from this, but most do not. Most users do not need to set this. The

1
doc/mpdconf.example
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@ -181,6 +181,7 @@ input {
# format "44100:16:2" # optional
# mixer_device "default" # optional
# mixer_control "PCM" # optional
# mixer_index "0" # optional
#}
#
# An example of an OSS output:

9
src/mixer/alsa_mixer.c
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@ -25,6 +25,7 @@
#define VOLUME_MIXER_ALSA_DEFAULT "default"
#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM"
#define VOLUME_MIXER_ALSA_INDEX_DEFAULT 0
struct alsa_mixer {
/** the base mixer class */
@ -32,6 +33,7 @@ struct alsa_mixer {
const char *device;
const char *control;
unsigned int index;
snd_mixer_t *handle;
snd_mixer_elem_t *elem;
@ -51,6 +53,8 @@ alsa_mixer_init(const struct config_param *param)
VOLUME_MIXER_ALSA_DEFAULT);
am->control = config_get_block_string(param, "mixer_control",
VOLUME_MIXER_ALSA_CONTROL_DEFAULT);
am->index = config_get_block_unsigned(param, "mixer_index",
VOLUME_MIXER_ALSA_INDEX_DEFAULT);
return &am->base;
}
@ -117,8 +121,9 @@ alsa_mixer_open(struct mixer *data)
while (elem) {
if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
if (strcasecmp(am->control,
snd_mixer_selem_get_name(elem)) == 0) {
if ((strcasecmp(am->control,
snd_mixer_selem_get_name(elem)) == 0) &&
(am->index == snd_mixer_selem_get_index(elem))) {
break;
}
}