2 * Copyright (C) 2015 "IoT.bzh"
3 * Author "Manuel Bachmann"
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #include "audio-api.h"
21 snd_mixer_selem_channel_id_t SCHANNELS[8] = {
22 SND_MIXER_SCHN_FRONT_LEFT,
23 SND_MIXER_SCHN_FRONT_RIGHT,
24 SND_MIXER_SCHN_FRONT_CENTER,
25 SND_MIXER_SCHN_REAR_LEFT,
26 SND_MIXER_SCHN_REAR_RIGHT,
27 SND_MIXER_SCHN_REAR_CENTER,
28 SND_MIXER_SCHN_SIDE_LEFT,
29 SND_MIXER_SCHN_SIDE_RIGHT
32 PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
35 snd_pcm_hw_params_t *params;
37 snd_mixer_selem_id_t *mixer_sid;
38 snd_mixer_elem_t *mixer_elm;
39 snd_mixer_elem_t *mixer_elm_m;
40 unsigned int rate = 22050;
41 long vol, vol_min, vol_max;
44 if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
47 snd_pcm_hw_params_malloc (¶ms);
48 snd_pcm_hw_params_any (dev, params);
49 snd_pcm_hw_params_set_access (dev, params, SND_PCM_ACCESS_RW_INTERLEAVED);
50 snd_pcm_hw_params_set_format (dev, params, SND_PCM_FORMAT_S16_LE);
51 snd_pcm_hw_params_set_rate_near (dev, params, &rate, 0);
52 snd_pcm_hw_params_set_channels (dev, params, ctx->channels);
53 if (snd_pcm_hw_params (dev, params) < 0) {
54 snd_pcm_hw_params_free (params);
57 snd_pcm_prepare (dev);
59 snd_mixer_open (&mixer, 0);
60 if (snd_mixer_attach (mixer, name) < 0) {
61 snd_pcm_hw_params_free (params);
64 snd_mixer_selem_register (mixer, NULL, NULL);
65 snd_mixer_load (mixer);
67 snd_mixer_selem_id_alloca (&mixer_sid);
68 snd_mixer_selem_id_set_index (mixer_sid, 0);
69 snd_mixer_selem_id_set_name (mixer_sid, "Master");
71 mixer_elm = snd_mixer_find_selem (mixer, mixer_sid);
75 /* no "Master" mixer ; we are probably on a board... search ! */
76 for (mixer_elm = snd_mixer_first_elem (mixer); mixer_elm != NULL;
77 mixer_elm = snd_mixer_elem_next (mixer_elm)) {
78 if (snd_mixer_elem_info (mixer_elm) < 0)
80 snd_mixer_selem_get_id (mixer_elm, mixer_sid);
81 if (strstr (snd_mixer_selem_id_get_name (mixer_sid), "DVC Out")) {
83 /* this is Porter... let us found the specific mute switch */
84 snd_mixer_selem_id_set_index (mixer_sid, 0);
85 snd_mixer_selem_id_set_name (mixer_sid, "DVC Out Mute");
86 mixer_elm_m = snd_mixer_find_selem (mixer, mixer_sid);
94 snd_mixer_selem_get_playback_volume_range (mixer_elm, &vol_min, &vol_max);
95 snd_mixer_selem_get_playback_volume (mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &vol);
98 /* allocate the global array if it hasn't been done */
100 dev_ctx_a = (dev_ctx_alsa_T**) malloc (sizeof(dev_ctx_alsa_T));
101 dev_ctx_a[0] = (dev_ctx_alsa_T*) malloc (sizeof(dev_ctx_alsa_T));
102 dev_ctx_a[0]->name = NULL;
103 dev_ctx_a[0]->dev = NULL;
106 /* is a card with similar name already opened ? */
107 for (num = 0; num < (sizeof(dev_ctx_a)/sizeof(dev_ctx_alsa_T)); num++) {
108 if (dev_ctx_a[num]->name &&
109 !strcmp (dev_ctx_a[num]->name, name))
114 /* it's not... let us add it to the global array */
115 dev_ctx_a = (dev_ctx_alsa_T**) realloc (dev_ctx_a, (num+1)*sizeof(dev_ctx_alsa_T));
116 dev_ctx_a[num] = (dev_ctx_alsa_T*) malloc (sizeof(dev_ctx_alsa_T));
117 dev_ctx_a[num]->name = strdup (name);
118 dev_ctx_a[num]->dev = dev;
119 dev_ctx_a[num]->params = params;
120 dev_ctx_a[num]->mixer_elm = mixer_elm;
121 dev_ctx_a[num]->mixer_elm_m = mixer_elm_m;
122 dev_ctx_a[num]->vol_max = vol_max;
123 dev_ctx_a[num]->vol = vol;
124 dev_ctx_a[num]->thr_should_run = 0;
125 dev_ctx_a[num]->thr_finished = 0;
127 /* make the client context aware of current card state */
128 for (i = 0; i < 8; i++)
129 ctx->volume[i] = _alsa_get_volume (num, i);
130 ctx->mute = _alsa_get_mute (num);
133 if (verbose) fprintf (stderr, "Successfully initialized ALSA backend.\n");
138 PUBLIC void _alsa_free (const char *name) {
142 for (num = 0; num < (sizeof(dev_ctx_a)/sizeof(dev_ctx_alsa_T)); num++) {
143 if (dev_ctx_a[num]->name &&
144 !strcmp (dev_ctx_a[num]->name, name)) {
145 snd_pcm_close (dev_ctx_a[num]->dev);
146 snd_pcm_hw_params_free (dev_ctx_a[num]->params);
147 free (dev_ctx_a[num]->name);
148 dev_ctx_a[num]->dev = NULL;
149 dev_ctx_a[num]->name = NULL;
150 free (dev_ctx_a[num]);
156 PUBLIC void _alsa_play (unsigned int num) {
158 if (!dev_ctx_a || !dev_ctx_a[num] || dev_ctx_a[num]->thr_should_run ||
159 access (AUDIO_BUFFER, F_OK) == -1)
162 dev_ctx_a[num]->thr_should_run = 1;
163 dev_ctx_a[num]->thr_finished = 0;
164 pthread_create (&dev_ctx_a[num]->thr, NULL, _alsa_play_thread_fn, (void*)dev_ctx_a[num]);
167 PUBLIC void _alsa_stop (unsigned int num) {
169 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->thr_should_run)
172 /* stop the "while" loop in thread */
173 dev_ctx_a[num]->thr_should_run = 0;
175 while (!dev_ctx_a[num]->thr_finished)
178 pthread_join (dev_ctx_a[num]->thr, NULL);
181 PUBLIC int _alsa_get_volume (unsigned int num, unsigned int channel) {
183 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm)
186 snd_mixer_selem_get_playback_volume (dev_ctx_a[num]->mixer_elm, SCHANNELS[channel], &dev_ctx_a[num]->vol);
188 return (int)(dev_ctx_a[num]->vol*100)/dev_ctx_a[num]->vol_max;
191 PUBLIC void _alsa_set_volume (unsigned int num, unsigned int channel, int vol) {
193 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm ||
197 snd_mixer_selem_set_playback_volume (dev_ctx_a[num]->mixer_elm, SCHANNELS[channel], (vol*dev_ctx_a[num]->vol_max)/100);
201 PUBLIC void _alsa_set_volume_all (unsigned int num, int vol) {
203 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm ||
206 snd_mixer_selem_set_playback_volume_all (dev_ctx_a[num]->mixer_elm, (vol*dev_ctx_a[num]->vol_max)/100);
209 PUBLIC unsigned char _alsa_get_mute (unsigned int num) {
212 snd_mixer_elem_t *elm_m;
214 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm)
217 dev_ctx_a[num]->mixer_elm_m ? (elm_m = dev_ctx_a[num]->mixer_elm_m) :
218 (elm_m = dev_ctx_a[num]->mixer_elm);
220 if (snd_mixer_selem_has_playback_switch (elm_m)) {
221 snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_LEFT, &mute);
222 snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_RIGHT, &mute);
225 if (dev_ctx_a[num]->mixer_elm_m)
226 return (unsigned char)mute;
228 return (unsigned char)!mute;
231 PUBLIC void _alsa_set_mute (unsigned int num, unsigned char tomute) {
233 snd_mixer_elem_t *elm_m;
236 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm || 1 < tomute < 0)
239 if (dev_ctx_a[num]->mixer_elm_m) {
240 elm_m = dev_ctx_a[num]->mixer_elm_m;
243 elm_m = dev_ctx_a[num]->mixer_elm;
247 if (snd_mixer_selem_has_playback_switch (elm_m))
248 snd_mixer_selem_set_playback_switch_all (elm_m, !mute);
251 PUBLIC void _alsa_set_rate (unsigned int num, unsigned int rate) {
253 if (!dev_ctx_a || !dev_ctx_a[num])
256 snd_pcm_hw_params_set_rate_near (dev_ctx_a[num]->dev, dev_ctx_a[num]->params, &rate, 0);
259 PUBLIC void _alsa_set_channels (unsigned int num, unsigned int channels) {
261 if (!dev_ctx_a || !dev_ctx_a[num])
264 snd_pcm_hw_params_set_channels (dev_ctx_a[num]->dev, dev_ctx_a[num]->params, channels);
267 /* ---- LOCAL THREADED FUNCTIONS ---- */
269 STATIC void* _alsa_play_thread_fn (void *ctx) {
271 dev_ctx_alsa_T *dev_ctx_a = (dev_ctx_alsa_T *)ctx;
277 file = fopen (AUDIO_BUFFER, "rb");
279 while (dev_ctx_a->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
280 fseek (file, 0, SEEK_END);
282 buf = (char*) realloc (buf, size * sizeof(char));
283 frames = (size * sizeof(char)) / 4;
285 fseek (file, 0, SEEK_SET);
286 fread (buf, 1, size, file);
289 if ((res = snd_pcm_writei (dev_ctx_a->dev, buf, frames)) != frames) {
290 snd_pcm_recover (dev_ctx_a->dev, res, 0);
291 snd_pcm_prepare (dev_ctx_a->dev);
293 /* snd_pcm_drain (dev_ctx->dev); */
296 if (file) fclose(file);
298 dev_ctx_a->thr_finished = 1;