2 * Copyright (C) 2016 "IoT.bzh"
3 * Author "Manuel Bachmann"
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
21 #include "audio-api.h"
22 #include "audio-pulse.h"
24 static struct alsa_info **alsa_info = NULL;
25 static struct dev_ctx_pulse **dev_ctx_p = NULL;
26 static unsigned int client_count = 0;
29 unsigned char _pulse_init (const char *name, audioCtxHandleT *ctx) {
32 pa_mainloop_api *pa_api;
33 pa_context *pa_context;
35 pa_sample_spec *pa_spec;
36 struct timeval tv_start, tv_now;
39 pa_loop = pa_mainloop_new ();
40 pa_api = pa_mainloop_get_api (pa_loop);
41 pa_context = pa_context_new (pa_api, "afb-audio-plugin");
43 /* allocate the global array if it hasn't been done */
45 dev_ctx_p = (dev_ctx_pulse_T**) malloc (sizeof(dev_ctx_pulse_T));
47 /* create a temporary device, to be held until sink gets discovered */
48 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T*) malloc (sizeof(dev_ctx_pulse_T));
49 dev_ctx_p_t->sink_name = NULL;
50 dev_ctx_p_t->card_name = (char**) malloc (sizeof(char*));
51 dev_ctx_p_t->card_name[0] = strdup (name);
52 dev_ctx_p_t->pa_loop = pa_loop;
53 dev_ctx_p_t->pa_context = pa_context;
55 pa_context_set_state_callback (pa_context, _pulse_context_cb, (void*)dev_ctx_p_t);
56 pa_context_connect (pa_context, NULL, 0, NULL);
58 /* 1 second should be sufficient to retrieve sink info */
59 gettimeofday (&tv_start, NULL);
60 gettimeofday (&tv_now, NULL);
61 while (tv_now.tv_sec - tv_start.tv_sec <= 1) {
62 pa_mainloop_iterate (pa_loop, 0, &ret);
65 fprintf (stderr, "Stopping PulseAudio backend...\n");
69 /* found a matching sink from callback */
70 fprintf (stderr, "Success : using sink n.%d\n", error);
71 ctx->audio_dev = (void*)dev_ctx_p[ret];
74 gettimeofday (&tv_now, NULL);
76 /* fail if we found no matching sink */
80 /* make the client context aware of current card state */
81 ctx->mute = (unsigned char)dev_ctx_p[ret]->mute;
82 ctx->channels = (unsigned int)dev_ctx_p[ret]->volume.channels;
83 for (i = 0; i < ctx->channels; i++)
84 ctx->volume[i] = dev_ctx_p[ret]->volume.values[i];
87 /* open matching sink for playback */
88 pa_spec = (pa_sample_spec*) malloc (sizeof(pa_sample_spec));
89 pa_spec->format = PA_SAMPLE_S16LE;
90 pa_spec->rate = 22050;
91 pa_spec->channels = (uint8_t)ctx->channels;
93 if (!(pa = pa_simple_new (NULL, "afb-audio-plugin", PA_STREAM_PLAYBACK, dev_ctx_p[ret]->sink_name,
94 "afb-audio-output", pa_spec, NULL, NULL, &error))) {
95 fprintf (stderr, "Error opening PulseAudio sink %s : %s\n",
96 dev_ctx_p[ret]->sink_name, pa_strerror(error));
99 dev_ctx_p[ret]->pa = pa;
104 fprintf (stderr, "Successfully initialized PulseAudio backend.\n");
109 void _pulse_free (audioCtxHandleT *ctx) {
114 if (client_count > 0) return;
116 for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T)); num++) {
118 for (i = 0; num < (sizeof(dev_ctx_p[num]->card_name)/sizeof(char*)); i++) {
119 free (dev_ctx_p[num]->card_name[i]);
120 dev_ctx_p[num]->card_name[i] = NULL;
122 pa_context_disconnect (dev_ctx_p[num]->pa_context);
123 pa_context_unref (dev_ctx_p[num]->pa_context);
124 pa_mainloop_free (dev_ctx_p[num]->pa_loop);
125 pa_simple_free (dev_ctx_p[num]->pa);
126 free (dev_ctx_p[num]->sink_name);
127 dev_ctx_p[num]->pa_context = NULL;
128 dev_ctx_p[num]->pa_loop = NULL;
129 dev_ctx_p[num]->pa = NULL;
130 dev_ctx_p[num]->sink_name = NULL;
131 free (dev_ctx_p[num]);
135 void _pulse_play (audioCtxHandleT *ctx) {
137 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
139 if (!dev_ctx_p_c || dev_ctx_p_c->thr_should_run || access (AUDIO_BUFFER, F_OK) == -1)
142 dev_ctx_p_c->thr_should_run = 1;
143 dev_ctx_p_c->thr_finished = 0;
144 pthread_create (&dev_ctx_p_c->thr, NULL, _pulse_play_thread_fn, (void*)dev_ctx_p_c);
147 void _pulse_stop (audioCtxHandleT *ctx) {
149 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
151 if (!dev_ctx_p_c || !dev_ctx_p_c->thr_should_run)
154 dev_ctx_p_c->thr_should_run = 0;
155 while (!dev_ctx_p_c->thr_finished)
157 pthread_join (dev_ctx_p_c->thr, NULL);
160 unsigned int _pulse_get_volume (audioCtxHandleT *ctx, unsigned int channel) {
162 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
167 _pulse_refresh_sink (dev_ctx_p_c);
169 return dev_ctx_p_c->volume.values[channel];
172 void _pulse_set_volume (audioCtxHandleT *ctx, unsigned int channel, unsigned int vol) {
174 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
175 struct pa_cvolume volume;
180 volume = dev_ctx_p_c->volume;
181 volume.values[channel] = vol;
183 pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
184 &volume, NULL, NULL);
185 _pulse_refresh_sink (dev_ctx_p_c);
188 void _pulse_set_volume_all (audioCtxHandleT *ctx, unsigned int vol) {
190 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
191 struct pa_cvolume volume;
196 pa_cvolume_init (&volume);
197 pa_cvolume_set (&volume, dev_ctx_p_c->volume.channels, vol);
199 pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
200 &volume, NULL, NULL);
201 _pulse_refresh_sink (dev_ctx_p_c);
204 unsigned char _pulse_get_mute (audioCtxHandleT *ctx) {
206 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
211 _pulse_refresh_sink (dev_ctx_p_c);
213 return (unsigned char)dev_ctx_p_c->mute;
216 void _pulse_set_mute (audioCtxHandleT *ctx, unsigned char mute) {
218 dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
223 pa_context_set_sink_mute_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
224 (int)mute, NULL, NULL);
225 _pulse_refresh_sink (dev_ctx_p_c);
228 /* ---- LOCAL HELPER FUNCTIONS ---- */
230 void _pulse_refresh_sink (dev_ctx_pulse_T* dev_ctx_p_c) {
232 dev_ctx_p_c->refresh = 1;
234 pa_context_get_sink_info_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
235 _pulse_sink_info_cb, (void*)dev_ctx_p_c);
237 while (dev_ctx_p_c->refresh)
238 pa_mainloop_iterate (dev_ctx_p_c->pa_loop, 0, NULL);
241 void _pulse_enumerate_cards () {
243 void **cards, **card;
244 char *name, *found, *alsa_name, *card_name;
245 int new_info, i, num = 0;
247 /* allocate the global alsa array */
248 alsa_info = (alsa_info_T**) malloc (sizeof(alsa_info_T));
249 alsa_info[0] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
250 alsa_info[0]->device = NULL;
251 alsa_info[0]->synonyms = NULL;
253 /* we use ALSA to enumerate cards */
254 snd_device_name_hint (-1, "pcm", &cards);
257 for (; *card != NULL; card++) {
258 name = snd_device_name_get_hint (*card, "NAME");
261 /* alsa name is before ':' (if ':' misses, then it has no card) */
262 found = strstr (name, ":");
263 if (!found) continue;
265 alsa_name = (char*) malloc (found-name+1);
266 strncpy (alsa_name, name, found-name);
267 alsa_name[found-name] = '\0';
269 /* card name is the invariant between "CARD=" and ',' */
270 found = strstr (name, "CARD=");
271 if (!found) continue;
274 card_name = strdup (found);
275 found = strstr (card_name, ",");
276 if (found) card_name[found-card_name] = '\0';
278 /* was the card name already listed in the global alsa array ? */
279 for (i = 0; i < (sizeof(alsa_info)/sizeof(alsa_info_T)); i++) {
281 if (alsa_info[i]->device &&
282 !strcmp (alsa_info[i]->device, card_name)) {
283 /* it was ; add the alsa name as a new synonym */
284 asprintf (&alsa_info[i]->synonyms, "%s:%s", alsa_info[i]->synonyms, alsa_name);
289 /* it was not ; create it */
291 alsa_info = (alsa_info_T**) realloc (alsa_info, (num+1)*sizeof(alsa_info_T));
292 alsa_info[num]->device = strdup (card_name);
293 asprintf (&alsa_info[num]->synonyms, ":%s", alsa_name);
301 char** _pulse_find_cards (const char *name) {
304 char *needle, *found, *next;
308 _pulse_enumerate_cards ();
310 asprintf (&needle, ":%s", name);
312 for (num = 0; num < (sizeof(alsa_info)/sizeof(alsa_info_T)); num++) {
314 found = strstr (alsa_info[num]->synonyms, needle);
316 /* if next character is not ':' or '\0', we are wrong */
317 if ((found[strlen(name)] != ':') && (found[strlen(name)] != '\0')) {
318 found = strstr (found+1, needle);
321 /* found it ; now return all the "synonym" cards */
322 found = strstr (alsa_info[num]->synonyms, ":");
324 next = strstr (found+1, ":");
325 cards = (char**) realloc (cards, (i+1)*sizeof(char*));
326 cards[i] = (char*) malloc (next-found+1);
327 strncpy (cards[i], found+1, next-found);
328 cards[i][next-found] = '\0';
338 /* ---- LOCAL CALLBACK FUNCTIONS ---- */
340 void _pulse_context_cb (pa_context *context, void *data) {
342 pa_context_state_t state = pa_context_get_state (context);
343 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
345 if (state == PA_CONTEXT_FAILED) {
346 fprintf (stderr, "Could not connect to PulseAudio !\n");
347 pa_mainloop_quit (dev_ctx_p_t->pa_loop, -1);
350 if (state == PA_CONTEXT_READY)
351 pa_context_get_sink_info_list (context, _pulse_sink_list_cb, (void*)dev_ctx_p_t);
354 void _pulse_sink_list_cb (pa_context *context, const pa_sink_info *info,
355 int eol, void *data) {
357 dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
358 const char *device_string;
365 /* ignore sinks with no cards */
366 if (!pa_proplist_contains (info->proplist, "device.string"))
369 device_string = pa_proplist_gets (info->proplist, "device.string");
371 /* was a sink with similar name already found ? */
372 for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T)); num++) {
373 if (dev_ctx_p[num]->sink_name &&
374 !strcmp (dev_ctx_p[num]->sink_name, info->name)) {
376 /* yet it was, did it have the required card ? */
377 cards = dev_ctx_p[num]->card_name;
378 for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
379 if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
380 /* it did : stop there and succeed */
381 fprintf (stderr, "Found matching sink : %s\n", info->name);
382 pa_mainloop_quit (dev_ctx_p_t->pa_loop, num);
385 /* it did not, ignore and return */
391 /* new sink, find all the cards it manages, fail if none */
392 cards = _pulse_find_cards (device_string);
395 /* everything is well, register it in global array */
396 dev_ctx_p_t->sink_name = strdup (info->name);
397 dev_ctx_p_t->card_name = cards;
398 dev_ctx_p_t->mute = info->mute;
399 dev_ctx_p_t->volume = info->volume;
400 dev_ctx_p_t->thr_should_run = 0;
401 dev_ctx_p_t->thr_finished = 0;
402 dev_ctx_p[num] = dev_ctx_p_t;
404 /* does this new sink have the card we are looking for ? */ /* TODO : factorize this */
405 for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
406 if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
407 /* it did : stop there and succeed */
408 fprintf (stderr, "Found matching sink : %s\n", info->name);
409 pa_mainloop_quit (dev_ctx_p_t->pa_loop, num);
414 void _pulse_sink_info_cb (pa_context *context, const pa_sink_info *info,
415 int eol, void *data) {
417 dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)data;
422 dev_ctx_p_c->refresh = 0;
423 dev_ctx_p_c->mute = info->mute;
424 dev_ctx_p_c->volume = info->volume;
427 /* ---- LOCAL THREADED FUNCTIONS ---- */
429 void* _pulse_play_thread_fn (void *ctx) {
431 dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)ctx;
437 file = fopen (AUDIO_BUFFER, "rb");
439 while (dev_ctx_p_c->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
440 fseek (file, 0, SEEK_END);
442 buf = (char*) realloc (buf, size * sizeof(char));
444 fseek (file, 0, SEEK_SET);
445 fread (buf, 1, size, file);
448 if (pa_simple_write (dev_ctx_p_c->pa, buf, size*2, &error) < 0)
449 fprintf (stderr, "Error writing to PulseAudio : %s\n", pa_strerror (error));
450 /* pa_simple_drain (dev_ctx_p_c->pa); */
453 if (file) fclose(file);
455 dev_ctx_p_c->thr_finished = 1;