Finalize Audio plugin

Signed-off-by: Manuel Bachmann <mbc@iot.bzh>

1 files changed, 110 insertions, 3 deletions

diff --git a/plugins/audio/audio-alsa.c b/plugins/audio/audio-alsa.c
index 8c08c8db..4d97c2d2 100644
--- a/plugins/audio/audio-alsa.c
+++ b/plugins/audio/audio-alsa.c
@@ -1,3 +1,21 @@
+/*
+ * Copyright (C) 2015 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "audio-api.h"
 #include "audio-alsa.h"
 
@@ -5,6 +23,11 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
 
     snd_pcm_t *dev;
     snd_pcm_hw_params_t *params;
+    snd_mixer_t *mixer;
+    snd_mixer_selem_id_t *mixer_sid;
+    snd_mixer_elem_t *mixer_elm;
+    unsigned int rate = 22050;
+    long vol, vol_min, vol_max;
     int num;
 
     if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
@@ -14,14 +37,30 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
     snd_pcm_hw_params_any (dev, params);
     snd_pcm_hw_params_set_access (dev, params, SND_PCM_ACCESS_RW_INTERLEAVED);
     snd_pcm_hw_params_set_format (dev, params, SND_PCM_FORMAT_S16_LE);
-    snd_pcm_hw_params_set_rate_near (dev, params, &ctx->rate, 0);
+    snd_pcm_hw_params_set_rate_near (dev, params, &rate, 0);
     snd_pcm_hw_params_set_channels (dev, params, ctx->channels);
     if (snd_pcm_hw_params (dev, params) < 0) {
         snd_pcm_hw_params_free (params);
         return 0;
     }
     snd_pcm_prepare (dev);
-    
+
+    snd_mixer_open (&mixer, 0);
+    if (snd_mixer_attach (mixer, name) < 0) {
+        snd_pcm_hw_params_free (params);
+        return 0;
+    }
+    snd_mixer_selem_register (mixer, NULL, NULL);
+    snd_mixer_load (mixer);
+
+    snd_mixer_selem_id_alloca (&mixer_sid);
+    snd_mixer_selem_id_set_index (mixer_sid, 0);
+    snd_mixer_selem_id_set_name (mixer_sid, "Master");
+
+    mixer_elm = snd_mixer_find_selem (mixer, mixer_sid);
+    snd_mixer_selem_get_playback_volume_range (mixer_elm, &vol_min, &vol_max);
+    snd_mixer_selem_get_playback_volume (mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &vol);
+
     /* allocate the global array if it hasn't been done */
     if (!dev_ctx) {
         dev_ctx = (dev_ctx_T**) malloc (sizeof(dev_ctx_T));
@@ -39,10 +78,19 @@ PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
     num++;
 
     /* it's not... let us add it to the global array */
+    dev_ctx = (dev_ctx_T**) realloc (dev_ctx, (num+1)*sizeof(dev_ctx_T));
     dev_ctx[num] = (dev_ctx_T*) malloc (sizeof(dev_ctx_T));
     dev_ctx[num]->name = strdup (name);
     dev_ctx[num]->dev = dev;
     dev_ctx[num]->params = params;
+    dev_ctx[num]->mixer_elm = mixer_elm;
+    dev_ctx[num]->vol_max = vol_max;
+    dev_ctx[num]->vol = vol;
+
+    /* make the client context aware of current card state */
+    ctx->volume = _alsa_get_volume (num);
+    ctx->mute = _alsa_get_mute (num);
+    ctx->idx = num;
 
     return 1;
 }
@@ -79,4 +127,63 @@ PUBLIC void _alsa_play (unsigned int num, void *buf, int len) {
         snd_pcm_prepare (dev_ctx[num]->dev);
     }
     /* snd_pcm_drain (dev_ctx[num]->dev); */
-}
\ No newline at end of file
+}
+
+PUBLIC unsigned int _alsa_get_volume (unsigned int num) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_mixer_selem_get_playback_volume (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &dev_ctx[num]->vol);
+
+    return (unsigned int)(dev_ctx[num]->vol*100)/dev_ctx[num]->vol_max;
+}
+
+PUBLIC unsigned int _alsa_set_volume (unsigned int num, unsigned int vol) {
+
+    if (!dev_ctx || !dev_ctx[num] || vol > 100)
+        return;
+
+   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) {
+
+    int mute = 0;
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    if (snd_mixer_selem_has_playback_switch (dev_ctx[num]->mixer_elm)) {
+        snd_mixer_selem_get_playback_switch (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &mute); 
+        snd_mixer_selem_get_playback_switch (dev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_RIGHT, &mute); 
+
+    }
+
+    return (unsigned char)mute;
+}
+
+PUBLIC void _alsa_set_mute (unsigned int num, unsigned char mute) {
+
+    if (!dev_ctx || !dev_ctx[num] || 1 < mute < 0)
+        return;
+
+    if (snd_mixer_selem_has_playback_switch (dev_ctx[num]->mixer_elm))
+        snd_mixer_selem_set_playback_switch_all (dev_ctx[num]->mixer_elm, mute);
+}
+
+PUBLIC void _alsa_set_rate (unsigned int num, unsigned int rate) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_pcm_hw_params_set_rate_near (dev_ctx[num]->dev, dev_ctx[num]->params, &rate, 0);
+}
+
+PUBLIC void _alsa_set_channels (unsigned int num, unsigned int channels) {
+
+    if (!dev_ctx || !dev_ctx[num])
+        return;
+
+    snd_pcm_hw_params_set_channels (dev_ctx[num]->dev, dev_ctx[num]->params, channels);
+}