aboutsummaryrefslogtreecommitdiffstats
path: root/bindings/audio/audio-pulse.c
blob: a6d1e4dcaccd1e3ccf4dfdf3daaf065c31fd2db4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
/*
 * Copyright (C) 2016 "IoT.bzh"
 * Author "Manuel Bachmann"
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define _GNU_SOURCE
#include <stdio.h>

#include "audio-api.h"
#include "audio-pulse.h"

static struct alsa_info **alsa_info = NULL;
static struct dev_ctx_pulse **dev_ctx_p = NULL;
static unsigned int client_count = 0;


unsigned char _pulse_init (const char *name, audioCtxHandleT *ctx) {

    pa_mainloop *pa_loop;
    pa_mainloop_api *pa_api;
    pa_context *pa_context;
    pa_simple *pa;
    pa_sample_spec *pa_spec;
    struct timeval tv_start, tv_now;
    int ret, error, i;

    pa_loop = pa_mainloop_new ();
    pa_api = pa_mainloop_get_api (pa_loop);
    pa_context = pa_context_new (pa_api, "afb-audio-plugin");

    /* allocate the global array if it hasn't been done */
    if (!dev_ctx_p)
        dev_ctx_p = (dev_ctx_pulse_T**) malloc (sizeof(dev_ctx_pulse_T*));

    /* create a temporary device, to be held until sink gets discovered */
    dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T*) malloc (sizeof(dev_ctx_pulse_T));
    dev_ctx_p_t->sink_name = NULL;
    dev_ctx_p_t->card_name = (char**) malloc (sizeof(char*));
    dev_ctx_p_t->card_name[0] = strdup (name);
    dev_ctx_p_t->pa_loop = pa_loop;
    dev_ctx_p_t->pa_context = pa_context;

    pa_context_set_state_callback (pa_context, _pulse_context_cb, (void*)dev_ctx_p_t);
    pa_context_connect (pa_context, NULL, 0, NULL);

    /* 1 second should be sufficient to retrieve sink info */
    gettimeofday (&tv_start, NULL);
    gettimeofday (&tv_now, NULL);
    while (tv_now.tv_sec - tv_start.tv_sec <= 2) {
        pa_mainloop_iterate (pa_loop, 0, &ret);

        if (ret == -1) { /* generic error */
            fprintf (stderr, "Stopping PulseAudio backend...\n");
            return 0;
        }

        if ((ret > 0)&&(ret < 100)) { /* 0 and >100 are PulseAudio codes */
            /* found a matching sink from callback */
            fprintf (stderr, "Success : using sink n.%d\n", ret-1);
            ctx->audio_dev = (void*)dev_ctx_p[ret-1];
            break;
        }
        gettimeofday (&tv_now, NULL);
    }
    /* fail if we found no matching sink */
    if (!ctx->audio_dev)
      return 0;

    /* make the client context aware of current card state */
    ctx->mute = (unsigned char)dev_ctx_p[ret-1]->mute;
    ctx->channels = (unsigned int)dev_ctx_p[ret-1]->volume.channels;
    for (i = 0; i < ctx->channels; i++)
        ctx->volume[i] = dev_ctx_p[ret-1]->volume.values[i];
    ctx->idx = ret-1;

    /* open matching sink for playback */
    pa_spec = (pa_sample_spec*) malloc (sizeof(pa_sample_spec));
    pa_spec->format = PA_SAMPLE_S16LE;
    pa_spec->rate = 22050;
    pa_spec->channels = (uint8_t)ctx->channels;

    if (!(pa = pa_simple_new (NULL, "afb-audio-plugin", PA_STREAM_PLAYBACK, dev_ctx_p[ret-1]->sink_name,
                              "afb-audio-output", pa_spec, NULL, NULL, &error))) {
        fprintf (stderr, "Error opening PulseAudio sink %s : %s\n",
                          dev_ctx_p[ret-1]->sink_name, pa_strerror(error));
        return 0;
    }
    dev_ctx_p[ret-1]->pa = pa;
    free (pa_spec);

    client_count++;

    fprintf (stderr, "Successfully initialized PulseAudio backend.\n");

    return 1;
}

void _pulse_free (audioCtxHandleT *ctx) {

    int num, i;

    client_count--;
    if (client_count > 0) return;

    for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T*)); num++) {

         for (i = 0; num < (sizeof(dev_ctx_p[num]->card_name)/sizeof(char*)); i++) {
             free (dev_ctx_p[num]->card_name[i]);
             dev_ctx_p[num]->card_name[i] = NULL;
         }
         pa_context_disconnect (dev_ctx_p[num]->pa_context);
         pa_context_unref (dev_ctx_p[num]->pa_context);
         pa_mainloop_free (dev_ctx_p[num]->pa_loop);
         pa_simple_free (dev_ctx_p[num]->pa);
         free (dev_ctx_p[num]->sink_name);
         dev_ctx_p[num]->pa_context = NULL;
         dev_ctx_p[num]->pa_loop = NULL;
         dev_ctx_p[num]->pa = NULL;
         dev_ctx_p[num]->sink_name = NULL;
         free (dev_ctx_p[num]);
    }
}

void _pulse_play (audioCtxHandleT *ctx) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;

    if (!dev_ctx_p_c || dev_ctx_p_c->thr_should_run || access (AUDIO_BUFFER, F_OK) == -1)
        return;

    dev_ctx_p_c->thr_should_run = 1;
    dev_ctx_p_c->thr_finished = 0;
    pthread_create (&dev_ctx_p_c->thr, NULL, _pulse_play_thread_fn, (void*)dev_ctx_p_c);
}

void _pulse_stop (audioCtxHandleT *ctx) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;

    if (!dev_ctx_p_c || !dev_ctx_p_c->thr_should_run)
        return;

    dev_ctx_p_c->thr_should_run = 0;
    while (!dev_ctx_p_c->thr_finished)
        usleep(100000);
    pthread_join (dev_ctx_p_c->thr, NULL);
}

unsigned int _pulse_get_volume (audioCtxHandleT *ctx, unsigned int channel) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;

    if (!dev_ctx_p_c)
        return 0;

    _pulse_refresh_sink (dev_ctx_p_c);

    return (dev_ctx_p_c->volume.values[channel]*100)/PA_VOLUME_NORM;
}

void _pulse_set_volume (audioCtxHandleT *ctx, unsigned int channel, unsigned int vol) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
    struct pa_cvolume volume;

    if (!dev_ctx_p_c)
        return;

    volume = dev_ctx_p_c->volume;
    volume.values[channel] = (vol*PA_VOLUME_NORM)/100;

    pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
                                        &volume, NULL, NULL);
    _pulse_refresh_sink (dev_ctx_p_c);
}

void _pulse_set_volume_all (audioCtxHandleT *ctx, unsigned int vol) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
    struct pa_cvolume volume;

    if (!dev_ctx_p_c)
        return;

    pa_cvolume_init (&volume);
    pa_cvolume_set (&volume, dev_ctx_p_c->volume.channels, vol);

    pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
                                        &volume, NULL, NULL);
    _pulse_refresh_sink (dev_ctx_p_c);
}

unsigned char _pulse_get_mute (audioCtxHandleT *ctx) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;

    if (!dev_ctx_p_c)
        return 0;

    _pulse_refresh_sink (dev_ctx_p_c);

    return (unsigned char)dev_ctx_p_c->mute;
}

void _pulse_set_mute (audioCtxHandleT *ctx, unsigned char mute) {

    dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;

    if (!dev_ctx_p_c)
        return;

    pa_context_set_sink_mute_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
                                      (int)mute, NULL, NULL);
    _pulse_refresh_sink (dev_ctx_p_c);
}

 /* ---- LOCAL HELPER FUNCTIONS ---- */

void _pulse_refresh_sink (dev_ctx_pulse_T* dev_ctx_p_c) {

    pa_mainloop_api *pa_api;

    dev_ctx_p_c->pa_loop = pa_mainloop_new ();
    pa_api = pa_mainloop_get_api (dev_ctx_p_c->pa_loop);
    dev_ctx_p_c->pa_context = pa_context_new (pa_api, "afb-audio-plugin");

    dev_ctx_p_c->refresh = 1;

    switch (pa_context_get_state (dev_ctx_p_c->pa_context)) {
      case PA_CONTEXT_READY:
        pa_context_get_sink_info_by_name (dev_ctx_p_c->pa_context,
                                          dev_ctx_p_c->sink_name,
                                          _pulse_sink_info_cb, (void*)dev_ctx_p_c);
        break;
      default:
        return;
    }

    while (dev_ctx_p_c->refresh)
        pa_mainloop_iterate (dev_ctx_p_c->pa_loop, 0, NULL);
}

void _pulse_enumerate_cards () {

    void **cards, **card;
    char *name, *found, *alsa_name, *card_name;
    int new_info, i, num = 0;

    /* allocate the global alsa array */
    alsa_info = (alsa_info_T**) malloc (sizeof(alsa_info_T*));
    alsa_info[0] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
    alsa_info[0]->device = NULL;
    alsa_info[0]->synonyms = NULL;

    /* we use ALSA to enumerate cards */
    snd_device_name_hint (-1, "pcm", &cards);
    card = cards;

    for (; *card != NULL; card++) {
        name = snd_device_name_get_hint (*card, "NAME");
        new_info = 1;

        /* alsa name is before ':' (if ':' misses, then it has no card) */
        found = strstr (name, ":");
        if (!found) continue;
        /* */
        alsa_name = (char*) malloc (found-name+1);
        strncpy (alsa_name, name, found-name);
        alsa_name[found-name] = '\0';

        /* card name is the invariant between "CARD=" and ',' */
        found = strstr (name, "CARD=");
        if (!found) continue;
        /* */
        found += 5;
        card_name = strdup (found);
        found = strstr (card_name, ",");
        if (found) card_name[found-card_name] = '\0';

        /* was the card name already listed in the global alsa array ? */
        for (i = 0; i < (sizeof(alsa_info)/sizeof(alsa_info_T*)); i++) {

            if (alsa_info[i]->device &&
                !strcmp (alsa_info[i]->device, card_name)) {
                /* it was ; add the alsa name as a new synonym */
                asprintf (&alsa_info[i]->synonyms, "%s:%s", alsa_info[i]->synonyms, alsa_name);
                new_info = 0;
                break;
            }
        }
        /* it was not ; create it */
        if (new_info) {
            alsa_info = (alsa_info_T**) realloc (alsa_info, (num+1)*sizeof(alsa_info_T*));
            alsa_info[num] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
            alsa_info[num]->device = strdup (card_name);
            asprintf (&alsa_info[num]->synonyms, ":%s", alsa_name);
            num++;
        }
        free (alsa_name);
        free (card_name);
    }
}

char** _pulse_find_cards (const char *name) {

    char **cards = NULL;
    char *needle, *found, *next;
    int num, i = 0;

    if (!alsa_info)
      _pulse_enumerate_cards ();

    asprintf (&needle, ":%s", name);

    for (num = 0; num < (sizeof(alsa_info)/sizeof(alsa_info_T*)); num++) {

        found = strstr (alsa_info[num]->synonyms, needle);
        while (found) {
            /* if next character is not ':' or '\0', we are wrong */
            if ((found[strlen(name)+1] != ':') && (found[strlen(name)+1] != '\0')) {
                found = strstr (found+1, needle);
                continue;
            }
            /* found it ; now return all the "synonym" cards */
            found = strstr (alsa_info[num]->synonyms, ":");
            while (found) {
                next = strstr (found+1, ":");
                if (!next) break;
                cards = (char**) realloc (cards, (i+1)*sizeof(char*));
                cards[i] = (char*) malloc (next-found+1);
                strncpy (cards[i], found+1, next-found);
                cards[i][next-found-1] = '\0';
                found = next; i++;
            }
        }
    }
    free (needle);

    return cards;
}

 /* ---- LOCAL CALLBACK FUNCTIONS ---- */

void _pulse_context_cb (pa_context *context, void *data) {

    pa_context_state_t state = pa_context_get_state (context);
    dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;

    if (state == PA_CONTEXT_FAILED) {
        fprintf (stderr, "Could not connect to PulseAudio !\n");
        pa_mainloop_quit (dev_ctx_p_t->pa_loop, -1);
        pa_context_disconnect (dev_ctx_p_t->pa_context);
        pa_context_unref (dev_ctx_p_t->pa_context);
        pa_mainloop_free (dev_ctx_p_t->pa_loop);
    }

    if (state == PA_CONTEXT_READY)
        pa_context_get_sink_info_list (context, _pulse_sink_list_cb, (void*)dev_ctx_p_t);
}

void _pulse_sink_list_cb (pa_context *context, const pa_sink_info *info,
				 int eol, void *data) {

    dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
    const char *device_string;
    char *device, *found;
    char **cards;
    int num, i;

    if (eol != 0)
        return;

    device_string = pa_proplist_gets (info->proplist, "device.string");
    /* ignore sinks with no cards */
    if (!device_string)
        return;

    /* was a sink with similar name already found ? */
    for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T*)); num++) {
        if (dev_ctx_p[num]->sink_name &&
           !strcmp (dev_ctx_p[num]->sink_name, info->name)) {

            /* yet it was, did it have the required card ? */
            cards = dev_ctx_p[num]->card_name;
            for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
                if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
                    /* it did : stop there and succeed */
                    fprintf (stderr, "Found matching sink : %s\n", info->name);
                    /* we return num+1 because '0' is already used */
                    pa_mainloop_quit (dev_ctx_p_t->pa_loop, num+1);
                    pa_context_disconnect (dev_ctx_p_t->pa_context);
                    pa_context_unref (dev_ctx_p_t->pa_context);
                    pa_mainloop_free (dev_ctx_p_t->pa_loop);
                }
            }
            /* it did not, ignore and return */
            return;
        }
    }
    num++;

    /* remove ending ":0",":1"... in device name */
    device = strdup (device_string);
    found = strstr (device, ":");
    if (found) device[found-device] = '\0';

    /* new sink, find all the cards it manages, fail if none */
    cards = _pulse_find_cards (device);
    free (device);
    if (!cards)
        return;

    /* everything is well, register it in global array */
    dev_ctx_p_t->sink_name = strdup (info->name);
    dev_ctx_p_t->card_name = cards;
    dev_ctx_p_t->mute = info->mute;
    dev_ctx_p_t->volume = info->volume;
    dev_ctx_p_t->thr_should_run = 0;
    dev_ctx_p_t->thr_finished = 0;
    dev_ctx_p[num] = dev_ctx_p_t;

    /* does this new sink have the card we are looking for ? */ /* TODO : factorize this */
    for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
        if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
             /* it did : stop there and succeed */
             fprintf (stderr, "Found matching sink : %s\n", info->name);
             /* we return num+1 because '0' is already used */
             pa_mainloop_quit (dev_ctx_p_t->pa_loop, num+1);
             pa_context_disconnect (dev_ctx_p_t->pa_context);
             pa_context_unref (dev_ctx_p_t->pa_context);
             pa_mainloop_free (dev_ctx_p_t->pa_loop);
        }
    }
}

void _pulse_sink_info_cb (pa_context *context, const pa_sink_info *info,
				 int eol, void *data) {

    dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)data;

    if (eol != 0)
        return;

    dev_ctx_p_c->refresh = 0;
    dev_ctx_p_c->mute = info->mute;
    dev_ctx_p_c->volume = info->volume;
}

 /* ---- LOCAL THREADED FUNCTIONS ---- */

void* _pulse_play_thread_fn (void *ctx) {

    dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)ctx;
    FILE *file = NULL;
    char *buf = NULL;
    long size;
    int error;

    file = fopen (AUDIO_BUFFER, "rb");

    while (dev_ctx_p_c->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));

        fseek (file, 0, SEEK_SET);
        fread (buf, 1, size, file);
        fflush (file);

        if (pa_simple_write (dev_ctx_p_c->pa, buf, size*2, &error) < 0)
            fprintf (stderr, "Error writing to PulseAudio : %s\n", pa_strerror (error));
        /* pa_simple_drain (dev_ctx_p_c->pa); */
    }
    if (buf) free(buf);
    if (file) fclose(file);

    dev_ctx_p_c->thr_finished = 1;
    return 0;
}