+/*
+ * 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"
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)
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);
+ if (mixer_elm) {
+ 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));
- dev_ctx[0] = (dev_ctx_T*) malloc (sizeof(dev_ctx_T));
- dev_ctx[0]->name = NULL;
- dev_ctx[0]->dev = NULL;
+ if (!adev_ctx) {
+ adev_ctx = (adev_ctx_T**) malloc (sizeof(adev_ctx_T));
+ adev_ctx[0] = (adev_ctx_T*) malloc (sizeof(adev_ctx_T));
+ adev_ctx[0]->name = NULL;
+ adev_ctx[0]->dev = NULL;
}
/* is a card with similar name already opened ? */
- for (num = 0; num < (sizeof(dev_ctx)/sizeof(dev_ctx_T)); num++) {
- if (dev_ctx[num]->name &&
- !strcmp (dev_ctx[num]->name, name))
+ for (num = 0; num < (sizeof(adev_ctx)/sizeof(adev_ctx_T)); num++) {
+ if (adev_ctx[num]->name &&
+ !strcmp (adev_ctx[num]->name, name))
return 0;
}
num++;
/* it's not... let us add it to the global array */
- 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;
+ adev_ctx = (adev_ctx_T**) realloc (adev_ctx, (num+1)*sizeof(adev_ctx_T));
+ adev_ctx[num] = (adev_ctx_T*) malloc (sizeof(adev_ctx_T));
+ adev_ctx[num]->name = strdup (name);
+ adev_ctx[num]->dev = dev;
+ adev_ctx[num]->params = params;
+ adev_ctx[num]->mixer_elm = mixer_elm;
+ adev_ctx[num]->vol_max = vol_max;
+ adev_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;
}
int num;
- for (num = 0; num < (sizeof(dev_ctx)/sizeof(dev_ctx_T)); num++) {
- if (dev_ctx[num]->name &&
- !strcmp (dev_ctx[num]->name, name)) {
- snd_pcm_close (dev_ctx[num]->dev);
- snd_pcm_hw_params_free (dev_ctx[num]->params);
- free (dev_ctx[num]->name);
- dev_ctx[num]->name = NULL;
- dev_ctx[num]->dev = NULL;
- free(dev_ctx[num]);
+ for (num = 0; num < (sizeof(adev_ctx)/sizeof(adev_ctx_T)); num++) {
+ if (adev_ctx[num]->name &&
+ !strcmp (adev_ctx[num]->name, name)) {
+ snd_pcm_close (adev_ctx[num]->dev);
+ snd_pcm_hw_params_free (adev_ctx[num]->params);
+ free (adev_ctx[num]->name);
+ adev_ctx[num]->name = NULL;
+ adev_ctx[num]->dev = NULL;
+ free(adev_ctx[num]);
return;
}
}
PUBLIC void _alsa_play (unsigned int num, void *buf, int len) {
- if (!dev_ctx || !dev_ctx[num])
+ if (!adev_ctx || !adev_ctx[num]) {
return;
-
+ }
int16_t *cbuf = (int16_t *)buf;
int frames = len / 2;
int res;
- if ((res = snd_pcm_writei (dev_ctx[num]->dev, cbuf, frames)) != frames) {
- snd_pcm_recover (dev_ctx[num]->dev, res, 0);
- snd_pcm_prepare (dev_ctx[num]->dev);
+ if ((res = snd_pcm_writei (adev_ctx[num]->dev, cbuf, frames)) != frames) {
+ snd_pcm_recover (adev_ctx[num]->dev, res, 0);
+ snd_pcm_prepare (adev_ctx[num]->dev);
+ }
+ /* snd_pcm_drain (adev_ctx[num]->dev); */
+}
+
+PUBLIC unsigned int _alsa_get_volume (unsigned int num) {
+
+ if (!adev_ctx || !adev_ctx[num] || !adev_ctx[num]->mixer_elm)
+ return;
+
+ snd_mixer_selem_get_playback_volume (adev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &adev_ctx[num]->vol);
+
+ return (unsigned int)(adev_ctx[num]->vol*100)/adev_ctx[num]->vol_max;
+}
+
+PUBLIC unsigned int _alsa_set_volume (unsigned int num, unsigned int vol) {
+
+ if (!adev_ctx || !adev_ctx[num] || !adev_ctx[num]->mixer_elm || vol > 100)
+ return;
+
+ snd_mixer_selem_set_playback_volume_all (adev_ctx[num]->mixer_elm, (vol*adev_ctx[num]->vol_max)/100);
+}
+
+PUBLIC unsigned char _alsa_get_mute (unsigned int num) {
+
+ int mute = 0;
+
+ if (!adev_ctx || !adev_ctx[num] || !adev_ctx[num]->mixer_elm)
+ return;
+
+ if (snd_mixer_selem_has_playback_switch (adev_ctx[num]->mixer_elm)) {
+ snd_mixer_selem_get_playback_switch (adev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &mute);
+ snd_mixer_selem_get_playback_switch (adev_ctx[num]->mixer_elm, SND_MIXER_SCHN_FRONT_RIGHT, &mute);
+
}
- /* snd_pcm_drain (dev_ctx[num]->dev); */
-}
\ No newline at end of file
+
+ return (unsigned char)!mute;
+}
+
+PUBLIC void _alsa_set_mute (unsigned int num, unsigned char mute) {
+
+ if (!adev_ctx || !adev_ctx[num] || !adev_ctx[num]->mixer_elm || 1 < mute < 0)
+ return;
+
+ if (snd_mixer_selem_has_playback_switch (adev_ctx[num]->mixer_elm))
+ snd_mixer_selem_set_playback_switch_all (adev_ctx[num]->mixer_elm, !mute);
+}
+
+PUBLIC void _alsa_set_rate (unsigned int num, unsigned int rate) {
+
+ if (!adev_ctx || !adev_ctx[num])
+ return;
+
+ snd_pcm_hw_params_set_rate_near (adev_ctx[num]->dev, adev_ctx[num]->params, &rate, 0);
+}
+
+PUBLIC void _alsa_set_channels (unsigned int num, unsigned int channels) {
+
+ if (!adev_ctx || !adev_ctx[num])
+ return;
+
+ snd_pcm_hw_params_set_channels (adev_ctx[num]->dev, adev_ctx[num]->params, channels);
+}