+/*
+ * 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_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;
snd_pcm_hw_params_t *params;
- int num;
+ snd_mixer_t *mixer;
+ snd_mixer_selem_id_t *mixer_sid;
+ snd_mixer_elem_t *mixer_elm;
+ snd_mixer_elem_t *mixer_elm_m;
+ unsigned int rate = 22050;
+ long vol, vol_min, vol_max;
+ int num, i;
if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
return 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);
+ mixer_elm_m = NULL;
+
+ if (!mixer_elm) {
+ /* no "Master" mixer ; we are probably on a board... search ! */
+ for (mixer_elm = snd_mixer_first_elem (mixer); mixer_elm != NULL;
+ mixer_elm = snd_mixer_elem_next (mixer_elm)) {
+ if (snd_mixer_elem_info (mixer_elm) < 0)
+ continue;
+ snd_mixer_selem_get_id (mixer_elm, mixer_sid);
+ if (strstr (snd_mixer_selem_id_get_name (mixer_sid), "DVC Out")) {
+
+ /* this is Porter... let us found the specific mute switch */
+ snd_mixer_selem_id_set_index (mixer_sid, 0);
+ snd_mixer_selem_id_set_name (mixer_sid, "DVC Out Mute");
+ mixer_elm_m = snd_mixer_find_selem (mixer, mixer_sid);
+
+ break;
+ }
+ }
+ }
+
+ 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));
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]->mixer_elm_m = mixer_elm_m;
+ dev_ctx[num]->vol_max = vol_max;
+ dev_ctx[num]->vol = vol;
+ dev_ctx[num]->thr_should_run = 0;
+ dev_ctx[num]->thr_finished = 0;
+
+ /* make the client context aware of current card state */
+ for (i = 0; i < 8; i++)
+ ctx->volume[i] = _alsa_get_volume (num, i);
+ ctx->mute = _alsa_get_mute (num);
+ ctx->idx = num;
return 1;
}
}
}
-PUBLIC void _alsa_play (unsigned int num, void *buf, int len) {
+PUBLIC void _alsa_play (unsigned int num) {
+
+ if (!dev_ctx || !dev_ctx[num] || dev_ctx[num]->thr_should_run ||
+ access (AUDIO_BUFFER, F_OK) == -1)
+ return;
+
+ dev_ctx[num]->thr_should_run = 1;
+ dev_ctx[num]->thr_finished = 0;
+ pthread_create(&dev_ctx[num]->thr, NULL, _play_thread_fn, (void*)dev_ctx[num]);
+}
+
+PUBLIC void _alsa_stop (unsigned int num) {
+
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->thr_should_run)
+ return;
+
+ /* stop the "while" loop in thread */
+ dev_ctx[num]->thr_should_run = 0;
+
+ while (!dev_ctx[num]->thr_finished)
+ usleep(100000);
+
+ pthread_join(dev_ctx[num]->thr, NULL);
+}
+
+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, SCHANNELS[channel], &dev_ctx[num]->vol);
+
+ return (int)(dev_ctx[num]->vol*100)/dev_ctx[num]->vol_max;
+}
+
+PUBLIC void _alsa_set_volume (unsigned int num, unsigned int channel, int vol) {
+
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm ||
+ 0 > vol > 100)
+ return;
+
+ 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) {
+
+ int mute = 0;
+ snd_mixer_elem_t *elm_m;
+
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm)
+ return;
+
+ dev_ctx[num]->mixer_elm_m ? (elm_m = dev_ctx[num]->mixer_elm_m) :
+ (elm_m = dev_ctx[num]->mixer_elm);
+
+ if (snd_mixer_selem_has_playback_switch (elm_m)) {
+ snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_LEFT, &mute);
+ snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_RIGHT, &mute);
+ }
+
+ if (dev_ctx[num]->mixer_elm_m)
+ return (unsigned char)mute;
+ else
+ return (unsigned char)!mute;
+}
+
+PUBLIC void _alsa_set_mute (unsigned int num, unsigned char tomute) {
+
+ snd_mixer_elem_t *elm_m;
+ int mute;
+
+ if (!dev_ctx || !dev_ctx[num] || !dev_ctx[num]->mixer_elm || 1 < tomute < 0)
+ return;
+
+ if (dev_ctx[num]->mixer_elm_m) {
+ elm_m = dev_ctx[num]->mixer_elm_m;
+ mute = (int)!tomute;
+ } else {
+ elm_m = dev_ctx[num]->mixer_elm;
+ mute = (int)tomute;
+ }
+
+ if (snd_mixer_selem_has_playback_switch (elm_m))
+ snd_mixer_selem_set_playback_switch_all (elm_m, !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;
- int16_t *cbuf = (int16_t *)buf;
- int frames = len / 2;
- int res;
+ snd_pcm_hw_params_set_channels (dev_ctx[num]->dev, dev_ctx[num]->params, channels);
+}
- 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);
+ /* ---- LOCAL THREADED FUNCTIONS ---- */
+
+STATIC void* _play_thread_fn (void *ctx) {
+
+ dev_ctx_T *dev_ctx = (dev_ctx_T *)ctx;
+ FILE *file = NULL;
+ char *buf = NULL;
+ long size;
+ int frames, res;
+
+ file = fopen (AUDIO_BUFFER, "rb");
+
+ while (dev_ctx->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
+ fseek (file, 0, SEEK_END);
+ size = ftell (file);
+ buf = (char*) realloc (buf, size * sizeof(char));
+ frames = (size * sizeof(char)) / 4;
+
+ fseek (file, 0, SEEK_SET);
+ fread (buf, 1, size, file);
+ fflush (file);
+
+ if ((res = snd_pcm_writei (dev_ctx->dev, buf, frames)) != frames) {
+ snd_pcm_recover (dev_ctx->dev, res, 0);
+ snd_pcm_prepare (dev_ctx->dev);
+ }
+ /* snd_pcm_drain (dev_ctx->dev); */
}
- /* snd_pcm_drain (dev_ctx[num]->dev); */
-}
\ No newline at end of file
+ if (buf) free(buf);
+ if (file) fclose(file);
+
+ dev_ctx->thr_finished = 1;
+ return 0;
+}