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alsa-mixer: Implement constant volume.

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This change makes it possible to configure an arbitrary constant volume for a
volume element in the path configuration, which is applied when the path is
selected. Note: this is only useful when the exact hardware and driver are
known beforehand.
This commit is contained in:
Tanu Kaskinen 2011-03-17 12:23:41 +02:00 • committed by Colin Guthrie
parent 55936640a1
commit e1c289cc6b
3 changed files with 59 additions and 12 deletions
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9
src/modules/alsa/alsa-mixer.h
View file

@ -62,9 +62,10 @@ typedef enum pa_alsa_switch_use {
typedef enum pa_alsa_volume_use {
PA_ALSA_VOLUME_IGNORE,
PA_ALSA_VOLUME_MERGE, /* merge this volume slider into the global volume slider */
PA_ALSA_VOLUME_OFF, /* set this volume to minimal unconditionally */
PA_ALSA_VOLUME_ZERO /* set this volume to 0dB unconditionally */
PA_ALSA_VOLUME_MERGE, /* merge this volume slider into the global volume slider */
PA_ALSA_VOLUME_OFF, /* set this volume to minimal unconditionally */
PA_ALSA_VOLUME_ZERO, /* set this volume to 0dB unconditionally */
PA_ALSA_VOLUME_CONSTANT /* set this volume to a constant value unconditionally */
} pa_alsa_volume_use_t;
typedef enum pa_alsa_enumeration_use {
@ -137,6 +138,8 @@ struct pa_alsa_element {
pa_alsa_required_t required_any;
pa_alsa_required_t required_absent;
long constant_volume;
pa_bool_t override_map:1;
pa_bool_t direction_try_other:1;