2 * Copyright (C) 2016 "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/>.
22 #include "audio-api.h"
23 #include "audio-pulse.h"
25 PUBLIC unsigned char _pulse_init (const char *name, audioCtxHandleT *ctx) {
28 pa_mainloop_api *pa_api;
29 pa_context *pa_context;
31 pa_sample_spec *pa_spec;
32 struct timeval tv_start, tv_now;
35 pa_loop = pa_mainloop_new ();
36 pa_api = pa_mainloop_get_api (pa_loop);
37 pa_context = pa_context_new (pa_api, "afb-audio-plugin");
39 /* allocate the global array if it hasn't been done */
41 dev_ctx_p = (dev_ctx_pulse_T**) malloc (sizeof(dev_ctx_pulse_T));
43 /* create a temporary device, to be held until sink gets discovered */
44 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T*) malloc (sizeof(dev_ctx_pulse_T));
45 dev_ctx_p_t->sink_name = NULL;
46 dev_ctx_p_t->card_name = (char**) malloc (sizeof(char*));
47 dev_ctx_p_t->card_name[0] = strdup (name);
48 dev_ctx_p_t->pa_loop = pa_loop;
49 dev_ctx_p_t->pa_context = pa_context;
51 pa_context_set_state_callback (pa_context, _pulse_context_cb, (void*)dev_ctx_p_t);
52 pa_context_connect (pa_context, NULL, 0, NULL);
54 /* 1 second should be sufficient to retrieve sink info */
55 gettimeofday (&tv_start, NULL);
56 gettimeofday (&tv_now, NULL);
57 while (tv_now.tv_sec - tv_start.tv_sec <= 1) {
58 pa_mainloop_iterate (pa_loop, 0, &ret);
61 if (verbose) fprintf (stderr, "Stopping PulseAudio backend...\n");
65 /* found a matching sink from callback */
66 if (verbose) fprintf (stderr, "Success : using sink n.%d\n", error);
67 ctx->audio_dev = (void*)dev_ctx_p[ret];
70 gettimeofday (&tv_now, NULL);
72 /* fail if we found no matching sink */
76 /* make the client context aware of current card state */
77 ctx->mute = (unsigned char)dev_ctx_p[ret]->mute;
78 ctx->channels = (unsigned int)dev_ctx_p[ret]->volume.channels;
79 for (i = 0; i < ctx->channels; i++)
80 ctx->volume[i] = dev_ctx_p[ret]->volume.values[i];
83 /* open matching sink for playback */
84 pa_spec = (pa_sample_spec*) malloc (sizeof(pa_sample_spec));
85 pa_spec->format = PA_SAMPLE_S16LE;
86 pa_spec->rate = 22050;
87 pa_spec->channels = (uint8_t)ctx->channels;
89 if (!(pa = pa_simple_new (NULL, "afb-audio-plugin", PA_STREAM_PLAYBACK, dev_ctx_p[ret]->sink_name,
90 "afb-audio-output", pa_spec, NULL, NULL, &error))) {
91 fprintf (stderr, "Error opening PulseAudio sink %s : %s\n",
92 dev_ctx_p[ret]->sink_name, pa_strerror(error));
95 dev_ctx_p[ret]->pa = pa;
100 if (verbose) fprintf (stderr, "Successfully initialized PulseAudio backend.\n");
105 PUBLIC void _pulse_free (audioCtxHandleT *ctx) {
110 if (client_count > 0) return;
112 for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T)); num++) {
114 for (i = 0; num < (sizeof(dev_ctx_p[num]->card_name)/sizeof(char*)); i++) {
115 free (dev_ctx_p[num]->card_name[i]);
116 dev_ctx_p[num]->card_name[i] = NULL;
118 pa_context_disconnect (dev_ctx_p[num]->pa_context);
119 pa_context_unref (dev_ctx_p[num]->pa_context);
120 pa_mainloop_free (dev_ctx_p[num]->pa_loop);
121 pa_simple_free (dev_ctx_p[num]->pa);
122 free (dev_ctx_p[num]->sink_name);
123 dev_ctx_p[num]->pa_context = NULL;
124 dev_ctx_p[num]->pa_loop = NULL;
125 dev_ctx_p[num]->pa = NULL;
126 dev_ctx_p[num]->sink_name = NULL;
127 free (dev_ctx_p[num]);
131 PUBLIC void _pulse_play (audioCtxHandleT *ctx) {
133 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
135 if (!dev_ctx_p_c || dev_ctx_p_c->thr_should_run || access (AUDIO_BUFFER, F_OK) == -1)
138 dev_ctx_p_c->thr_should_run = 1;
139 dev_ctx_p_c->thr_finished = 0;
140 pthread_create (&dev_ctx_p_c->thr, NULL, _pulse_play_thread_fn, (void*)dev_ctx_p_c);
143 PUBLIC void _pulse_stop (audioCtxHandleT *ctx) {
145 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
147 if (!dev_ctx_p_c || !dev_ctx_p_c->thr_should_run)
150 dev_ctx_p_c->thr_should_run = 0;
151 while (!dev_ctx_p_c->thr_finished)
153 pthread_join (dev_ctx_p_c->thr, NULL);
156 PUBLIC unsigned int _pulse_get_volume (audioCtxHandleT *ctx, unsigned int channel) {
158 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
163 _pulse_refresh_sink (dev_ctx_p_c);
165 return dev_ctx_p_c->volume.values[channel];
168 PUBLIC void _pulse_set_volume (audioCtxHandleT *ctx, unsigned int channel, unsigned int vol) {
170 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
171 struct pa_cvolume volume;
176 volume = dev_ctx_p_c->volume;
177 volume.values[channel] = vol;
179 pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
180 &volume, NULL, NULL);
181 _pulse_refresh_sink (dev_ctx_p_c);
184 PUBLIC void _pulse_set_volume_all (audioCtxHandleT *ctx, unsigned int vol) {
186 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
187 struct pa_cvolume volume;
192 pa_cvolume_init (&volume);
193 pa_cvolume_set (&volume, dev_ctx_p_c->volume.channels, vol);
195 pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
196 &volume, NULL, NULL);
197 _pulse_refresh_sink (dev_ctx_p_c);
200 PUBLIC unsigned char _pulse_get_mute (audioCtxHandleT *ctx) {
202 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
207 _pulse_refresh_sink (dev_ctx_p_c);
209 return (unsigned char)dev_ctx_p_c->mute;
212 PUBLIC void _pulse_set_mute (audioCtxHandleT *ctx, unsigned char mute) {
214 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
219 pa_context_set_sink_mute_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
220 (int)mute, NULL, NULL);
221 _pulse_refresh_sink (dev_ctx_p_c);
224 /* ---- LOCAL HELPER FUNCTIONS ---- */
226 void _pulse_refresh_sink (dev_ctx_pulse_T* dev_ctx_p_c) {
228 dev_ctx_p_c->refresh = 1;
230 pa_context_get_sink_info_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
231 _pulse_sink_info_cb, (void*)dev_ctx_p_c);
233 while (dev_ctx_p_c->refresh)
234 pa_mainloop_iterate (dev_ctx_p_c->pa_loop, 0, NULL);
237 void _pulse_enumerate_cards () {
239 void **cards, **card;
240 char *name, *found, *alsa_name, *card_name;
241 int new_info, i, num = 0;
243 /* allocate the global alsa array */
244 alsa_info = (alsa_info_T**) malloc (sizeof(alsa_info_T));
245 alsa_info[0] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
246 alsa_info[0]->device = NULL;
247 alsa_info[0]->synonyms = NULL;
249 /* we use ALSA to enumerate cards */
250 snd_device_name_hint (-1, "pcm", &cards);
253 for (; *card != NULL; card++) {
254 name = snd_device_name_get_hint (*card, "NAME");
257 /* alsa name is before ':' (if ':' misses, then it has no card) */
258 found = strstr (name, ":");
259 if (!found) continue;
261 alsa_name = (char*) malloc (found-name+1);
262 strncpy (alsa_name, name, found-name);
263 alsa_name[found-name] = '\0';
265 /* card name is the invariant between "CARD=" and ',' */
266 found = strstr (name, "CARD=");
267 if (!found) continue;
270 card_name = strdup (found);
271 found = strstr (card_name, ",");
272 if (found) card_name[found-card_name] = '\0';
274 /* was the card name already listed in the global alsa array ? */
275 for (i = 0; i < (sizeof(alsa_info)/sizeof(alsa_info_T)); i++) {
277 if (alsa_info[i]->device &&
278 !strcmp (alsa_info[i]->device, card_name)) {
279 /* it was ; add the alsa name as a new synonym */
280 asprintf (&alsa_info[i]->synonyms, "%s:%s", alsa_info[i]->synonyms, alsa_name);
285 /* it was not ; create it */
287 alsa_info = (alsa_info_T**) realloc (alsa_info, (num+1)*sizeof(alsa_info_T));
288 alsa_info[num]->device = strdup (card_name);
289 asprintf (&alsa_info[num]->synonyms, ":%s", alsa_name);
297 char** _pulse_find_cards (const char *name) {
300 char *needle, *found, *next;
304 _pulse_enumerate_cards ();
306 asprintf (&needle, ":%s", name);
308 for (num = 0; num < (sizeof(alsa_info)/sizeof(alsa_info_T)); num++) {
310 found = strstr (alsa_info[num]->synonyms, needle);
312 /* if next character is not ':' or '\0', we are wrong */
313 if ((found[strlen(name)] != ':') && (found[strlen(name)] != '\0')) {
314 found = strstr (found+1, needle);
317 /* found it ; now return all the "synonym" cards */
318 found = strstr (alsa_info[num]->synonyms, ":");
320 next = strstr (found+1, ":");
321 cards = (char**) realloc (cards, (i+1)*sizeof(char*));
322 cards[i] = (char*) malloc (next-found+1);
323 strncpy (cards[i], found+1, next-found);
324 cards[i][next-found] = '\0';
334 /* ---- LOCAL CALLBACK FUNCTIONS ---- */
336 STATIC void _pulse_context_cb (pa_context *context, void *data) {
338 pa_context_state_t state = pa_context_get_state (context);
339 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
341 if (state == PA_CONTEXT_FAILED) {
342 fprintf (stderr, "Could not connect to PulseAudio !\n");
343 pa_mainloop_quit (dev_ctx_p_t->pa_loop, -1);
346 if (state == PA_CONTEXT_READY)
347 pa_context_get_sink_info_list (context, _pulse_sink_list_cb, (void*)dev_ctx_p_t);
350 STATIC void _pulse_sink_list_cb (pa_context *context, const pa_sink_info *info,
351 int eol, void *data) {
353 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
354 const char *device_string;
361 /* ignore sinks with no cards */
362 if (!pa_proplist_contains (info->proplist, "device.string"))
365 device_string = pa_proplist_gets (info->proplist, "device.string");
367 /* was a sink with similar name already found ? */
368 for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T)); num++) {
369 if (dev_ctx_p[num]->sink_name &&
370 !strcmp (dev_ctx_p[num]->sink_name, info->name)) {
372 /* yet it was, did it have the required card ? */
373 cards = dev_ctx_p[num]->card_name;
374 for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
375 if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
376 /* it did : stop there and succeed */
377 if (verbose) fprintf (stderr, "Found matching sink : %s\n", info->name);
378 pa_mainloop_quit (dev_ctx_p_t->pa_loop, num);
381 /* it did not, ignore and return */
387 /* new sink, find all the cards it manages, fail if none */
388 cards = _pulse_find_cards (device_string);
391 /* everything is well, register it in global array */
392 dev_ctx_p_t->sink_name = strdup (info->name);
393 dev_ctx_p_t->card_name = cards;
394 dev_ctx_p_t->mute = info->mute;
395 dev_ctx_p_t->volume = info->volume;
396 dev_ctx_p_t->thr_should_run = 0;
397 dev_ctx_p_t->thr_finished = 0;
398 dev_ctx_p[num] = dev_ctx_p_t;
400 /* does this new sink have the card we are looking for ? */ /* TODO : factorize this */
401 for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
402 if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
403 /* it did : stop there and succeed */
404 if (verbose) fprintf (stderr, "Found matching sink : %s\n", info->name);
405 pa_mainloop_quit (dev_ctx_p_t->pa_loop, num);
410 STATIC void _pulse_sink_info_cb (pa_context *context, const pa_sink_info *info,
411 int eol, void *data) {
413 dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)data;
418 dev_ctx_p_c->refresh = 0;
419 dev_ctx_p_c->mute = info->mute;
420 dev_ctx_p_c->volume = info->volume;
423 /* ---- LOCAL THREADED FUNCTIONS ---- */
425 STATIC void* _pulse_play_thread_fn (void *ctx) {
427 dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)ctx;
433 file = fopen (AUDIO_BUFFER, "rb");
435 while (dev_ctx_p_c->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
436 fseek (file, 0, SEEK_END);
438 buf = (char*) realloc (buf, size * sizeof(char));
440 fseek (file, 0, SEEK_SET);
441 fread (buf, 1, size, file);
444 if (pa_simple_write (dev_ctx_p_c->pa, buf, size*2, &error) < 0)
445 fprintf (stderr, "Error writing to PulseAudio : %s\n", pa_strerror (error));
446 /* pa_simple_drain (dev_ctx_p_c->pa); */
449 if (file) fclose(file);
451 dev_ctx_p_c->thr_finished = 1;