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authorManuel Bachmann <manuel.bachmann@iot.bzh>2015-12-22 15:17:37 +0100
committerManuel Bachmann <manuel.bachmann@iot.bzh>2015-12-22 15:17:37 +0100
commit6f2913ab5e366e8f3df12a7df11a85b7b6574e2c (patch)
tree60bb00a0b8fe0dadefbdbeb9c01445b5b645d7f3 /plugins/audio/audio-alsa.c
parent1b238baa74d36f144581deee5f3a1834d1d445bb (diff)
Audio API: manage multiple-channel volume
You can now set the volume for multiple channels independantly by using the "value=<1>,<2>..." syntax. Signed-off-by: Manuel Bachmann <manuel.bachmann@iot.bzh>
Diffstat (limited to 'plugins/audio/audio-alsa.c')
-rw-r--r--plugins/audio/audio-alsa.c38
1 files changed, 30 insertions, 8 deletions
diff --git a/plugins/audio/audio-alsa.c b/plugins/audio/audio-alsa.c
index 8e56e52d..1f54f244 100644
--- a/plugins/audio/audio-alsa.c
+++ b/plugins/audio/audio-alsa.c
@@ -19,6 +19,17 @@
#include "audio-api.h"
#include "audio-alsa.h"
+snd_mixer_selem_channel_id_t SCHANNELS[8] = {
+ SND_MIXER_SCHN_FRONT_LEFT,
+ SND_MIXER_SCHN_FRONT_RIGHT,
+ SND_MIXER_SCHN_FRONT_CENTER,
+ SND_MIXER_SCHN_REAR_LEFT,
+ SND_MIXER_SCHN_REAR_RIGHT,
+ SND_MIXER_SCHN_REAR_CENTER,
+ SND_MIXER_SCHN_SIDE_LEFT,
+ SND_MIXER_SCHN_SIDE_RIGHT
+};
+
PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
snd_pcm_t *dev;
@@ -28,7 +39,7 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
snd_mixer_elem_t *mixer_elm;
unsigned int rate = 22050;
long vol, vol_min, vol_max;
- int num;
+ int num, i;
if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
return 0;
@@ -105,7 +116,8 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
dev_ctx[num]->thr_finished = 0;
/* make the client context aware of current card state */
- ctx->volume = _alsa_get_volume (num);
+ for (i = 0; i < 8; i++)
+ ctx->volume[i] = _alsa_get_volume (num, i);
ctx->mute = _alsa_get_mute (num);
ctx->idx = num;
@@ -155,22 +167,32 @@ PUBLIC void _alsa_stop (unsigned int num) {
pthread_join(dev_ctx[num]->thr, NULL);
}
-PUBLIC unsigned int _alsa_get_volume (unsigned int num) {
+PUBLIC int _alsa_get_volume (unsigned int num, unsigned int channel) {
if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm)
return;
- snd_mixer_selem_get_playback_volume (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &dev_ctx[num]->vol);
+ snd_mixer_selem_get_playback_volume (dev_ctx[num]->mixer_elm, SCHANNELS[channel], &dev_ctx[num]->vol);
- return (unsigned int)(dev_ctx[num]->vol*100)/dev_ctx[num]->vol_max;
+ return (int)(dev_ctx[num]->vol*100)/dev_ctx[num]->vol_max;
}
-PUBLIC unsigned int _alsa_set_volume (unsigned int num, unsigned int vol) {
+PUBLIC void _alsa_set_volume (unsigned int num, unsigned int channel, int vol) {
- if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm || vol > 100)
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm ||
+ 0 > vol > 100)
return;
- snd_mixer_selem_set_playback_volume_all (dev_ctx[num]->mixer_elm, (vol*dev_ctx[num]->vol_max)/100);
+ snd_mixer_selem_set_playback_volume (dev_ctx[num]->mixer_elm, SCHANNELS[channel], (vol*dev_ctx[num]->vol_max)/100);
+
+}
+
+PUBLIC void _alsa_set_volume_all (unsigned int num, int vol) {
+
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm ||
+ 0 > vol > 100)
+
+ snd_mixer_selem_set_playback_volume_all (dev_ctx[num]->mixer_elm, (vol*dev_ctx[num]->vol_max)/100);
}
PUBLIC unsigned char _alsa_get_mute (unsigned int num) {