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"
20 #include "audio-alsa.h"
22 snd_mixer_selem_channel_id_t SCHANNELS[8] = {
23 SND_MIXER_SCHN_FRONT_LEFT,
24 SND_MIXER_SCHN_FRONT_RIGHT,
25 SND_MIXER_SCHN_FRONT_CENTER,
26 SND_MIXER_SCHN_REAR_LEFT,
27 SND_MIXER_SCHN_REAR_RIGHT,
28 SND_MIXER_SCHN_REAR_CENTER,
29 SND_MIXER_SCHN_SIDE_LEFT,
30 SND_MIXER_SCHN_SIDE_RIGHT
33 PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) {
36 snd_pcm_hw_params_t *params;
38 snd_mixer_selem_id_t *mixer_sid;
39 snd_mixer_elem_t *mixer_elm;
40 snd_mixer_elem_t *mixer_elm_m;
41 unsigned int rate = 22050;
42 long vol, vol_min, vol_max;
45 if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
48 snd_pcm_hw_params_malloc (¶ms);
49 snd_pcm_hw_params_any (dev, params);
50 snd_pcm_hw_params_set_access (dev, params, SND_PCM_ACCESS_RW_INTERLEAVED);
51 snd_pcm_hw_params_set_format (dev, params, SND_PCM_FORMAT_S16_LE);
52 snd_pcm_hw_params_set_rate_near (dev, params, &rate, 0);
53 snd_pcm_hw_params_set_channels (dev, params, ctx->channels);
54 if (snd_pcm_hw_params (dev, params) < 0) {
55 snd_pcm_hw_params_free (params);
58 snd_pcm_prepare (dev);
60 snd_mixer_open (&mixer, 0);
61 if (snd_mixer_attach (mixer, name) < 0) {
62 snd_pcm_hw_params_free (params);
65 snd_mixer_selem_register (mixer, NULL, NULL);
66 snd_mixer_load (mixer);
68 snd_mixer_selem_id_alloca (&mixer_sid);
69 snd_mixer_selem_id_set_index (mixer_sid, 0);
70 snd_mixer_selem_id_set_name (mixer_sid, "Master");
72 mixer_elm = snd_mixer_find_selem (mixer, mixer_sid);
76 /* no "Master" mixer ; we are probably on a board... search ! */
77 for (mixer_elm = snd_mixer_first_elem (mixer); mixer_elm != NULL;
78 mixer_elm = snd_mixer_elem_next (mixer_elm)) {
79 if (snd_mixer_elem_info (mixer_elm) < 0)
81 snd_mixer_selem_get_id (mixer_elm, mixer_sid);
82 if (strstr (snd_mixer_selem_id_get_name (mixer_sid), "DVC Out")) {
84 /* this is Porter... let us found the specific mute switch */
85 snd_mixer_selem_id_set_index (mixer_sid, 0);
86 snd_mixer_selem_id_set_name (mixer_sid, "DVC Out Mute");
87 mixer_elm_m = snd_mixer_find_selem (mixer, mixer_sid);
95 snd_mixer_selem_get_playback_volume_range (mixer_elm, &vol_min, &vol_max);
96 snd_mixer_selem_get_playback_volume (mixer_elm, SND_MIXER_SCHN_FRONT_LEFT, &vol);
99 /* allocate the global array if it hasn't been done */
101 dev_ctx_a = (dev_ctx_alsa_T**) malloc (sizeof(dev_ctx_alsa_T));
102 dev_ctx_a[0] = (dev_ctx_alsa_T*) malloc (sizeof(dev_ctx_alsa_T));
103 dev_ctx_a[0]->name = NULL;
104 dev_ctx_a[0]->dev = NULL;
107 /* is a card with similar name already opened ? */
108 for (num = 0; num < (sizeof(dev_ctx_a)/sizeof(dev_ctx_alsa_T)); num++) {
109 if (dev_ctx_a[num]->name &&
110 !strcmp (dev_ctx_a[num]->name, name))
115 /* it's not... let us add it to the global array */
116 dev_ctx_a = (dev_ctx_alsa_T**) realloc (dev_ctx_a, (num+1)*sizeof(dev_ctx_alsa_T));
117 dev_ctx_a[num] = (dev_ctx_alsa_T*) malloc (sizeof(dev_ctx_alsa_T));
118 dev_ctx_a[num]->name = strdup (name);
119 dev_ctx_a[num]->dev = dev;
120 dev_ctx_a[num]->params = params;
121 dev_ctx_a[num]->mixer_elm = mixer_elm;
122 dev_ctx_a[num]->mixer_elm_m = mixer_elm_m;
123 dev_ctx_a[num]->vol_max = vol_max;
124 dev_ctx_a[num]->vol = vol;
125 dev_ctx_a[num]->thr_should_run = 0;
126 dev_ctx_a[num]->thr_finished = 0;
128 /* make the client context aware of current card state */
129 for (i = 0; i < 8; i++)
130 ctx->volume[i] = _alsa_get_volume (num, i);
131 ctx->mute = _alsa_get_mute (num);
133 ctx->name = strdup (name);
135 if (verbose) fprintf (stderr, "Successfully initialized ALSA backend.\n");
140 PUBLIC void _alsa_free (const char *name) {
144 for (num = 0; num < (sizeof(dev_ctx_a)/sizeof(dev_ctx_alsa_T)); num++) {
145 if (dev_ctx_a[num]->name &&
146 !strcmp (dev_ctx_a[num]->name, name)) {
147 snd_pcm_close (dev_ctx_a[num]->dev);
148 snd_pcm_hw_params_free (dev_ctx_a[num]->params);
149 free (dev_ctx_a[num]->name);
150 dev_ctx_a[num]->dev = NULL;
151 dev_ctx_a[num]->name = NULL;
152 free (dev_ctx_a[num]);
158 PUBLIC void _alsa_play (int num) {
160 if (!dev_ctx_a || !dev_ctx_a[num] || dev_ctx_a[num]->thr_should_run ||
161 access (AUDIO_BUFFER, F_OK) == -1)
164 dev_ctx_a[num]->thr_should_run = 1;
165 dev_ctx_a[num]->thr_finished = 0;
166 pthread_create (&dev_ctx_a[num]->thr, NULL, _alsa_play_thread_fn, (void*)dev_ctx_a[num]);
169 PUBLIC void _alsa_stop (int num) {
171 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->thr_should_run)
174 /* stop the "while" loop in thread */
175 dev_ctx_a[num]->thr_should_run = 0;
177 while (!dev_ctx_a[num]->thr_finished)
180 pthread_join (dev_ctx_a[num]->thr, NULL);
183 PUBLIC unsigned int _alsa_get_volume (int num, unsigned int channel) {
185 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm)
188 snd_mixer_selem_get_playback_volume (dev_ctx_a[num]->mixer_elm, SCHANNELS[channel], &dev_ctx_a[num]->vol);
190 return (int)(dev_ctx_a[num]->vol*100)/dev_ctx_a[num]->vol_max;
193 PUBLIC void _alsa_set_volume (int num, unsigned int channel, unsigned int vol) {
195 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm ||
199 snd_mixer_selem_set_playback_volume (dev_ctx_a[num]->mixer_elm, SCHANNELS[channel], (vol*dev_ctx_a[num]->vol_max)/100);
203 PUBLIC void _alsa_set_volume_all (int num, unsigned int vol) {
205 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm ||
208 snd_mixer_selem_set_playback_volume_all (dev_ctx_a[num]->mixer_elm, (vol*dev_ctx_a[num]->vol_max)/100);
211 PUBLIC unsigned char _alsa_get_mute (int num) {
214 snd_mixer_elem_t *elm_m;
216 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm)
219 dev_ctx_a[num]->mixer_elm_m ? (elm_m = dev_ctx_a[num]->mixer_elm_m) :
220 (elm_m = dev_ctx_a[num]->mixer_elm);
222 if (snd_mixer_selem_has_playback_switch (elm_m)) {
223 snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_LEFT, &mute);
224 snd_mixer_selem_get_playback_switch (elm_m, SND_MIXER_SCHN_FRONT_RIGHT, &mute);
227 if (dev_ctx_a[num]->mixer_elm_m)
228 return (unsigned char)mute;
230 return (unsigned char)!mute;
233 PUBLIC void _alsa_set_mute (int num, unsigned char tomute) {
235 snd_mixer_elem_t *elm_m;
238 if (!dev_ctx_a || !dev_ctx_a[num] || !dev_ctx_a[num]->mixer_elm || 1 < tomute)
241 if (dev_ctx_a[num]->mixer_elm_m) {
242 elm_m = dev_ctx_a[num]->mixer_elm_m;
245 elm_m = dev_ctx_a[num]->mixer_elm;
249 if (snd_mixer_selem_has_playback_switch (elm_m))
250 snd_mixer_selem_set_playback_switch_all (elm_m, !mute);
253 PUBLIC void _alsa_set_rate (int num, unsigned int rate) {
255 if (!dev_ctx_a || !dev_ctx_a[num])
258 snd_pcm_hw_params_set_rate_near (dev_ctx_a[num]->dev, dev_ctx_a[num]->params, &rate, 0);
261 PUBLIC void _alsa_set_channels (int num, unsigned int channels) {
263 if (!dev_ctx_a || !dev_ctx_a[num])
266 snd_pcm_hw_params_set_channels (dev_ctx_a[num]->dev, dev_ctx_a[num]->params, channels);
269 /* ---- LOCAL THREADED FUNCTIONS ---- */
271 STATIC void* _alsa_play_thread_fn (void *ctx) {
273 dev_ctx_alsa_T *dev_ctx_a = (dev_ctx_alsa_T *)ctx;
279 file = fopen (AUDIO_BUFFER, "rb");
281 while (dev_ctx_a->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
282 fseek (file, 0, SEEK_END);
284 buf = (char*) realloc (buf, size * sizeof(char));
285 frames = (size * sizeof(char)) / 4;
287 fseek (file, 0, SEEK_SET);
288 fread (buf, 1, size, file);
291 if ((res = snd_pcm_writei (dev_ctx_a->dev, buf, frames)) != frames) {
292 snd_pcm_recover (dev_ctx_a->dev, res, 0);
293 snd_pcm_prepare (dev_ctx_a->dev);
295 /* snd_pcm_drain (dev_ctx->dev); */
298 if (file) fclose(file);
300 dev_ctx_a->thr_finished = 1;