summaryrefslogtreecommitdiffstats
path: root/src/gstreamer.c
blob: 9582b00e32d50acb6a0c7dfc790f090c400aa568 (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
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
/*-*- Mode: C; c-basic-offset: 8 -*-*/

/***
  This file is part of libcanberra.

  Copyright 2008 Nokia Corporation and/or its subsidiary(-ies).

  Author: Marc-Andre Lureau <marc-andre.lureau@nokia.com>

  libcanberra is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation, either version 2.1 of the
  License, or (at your option) any later version.

  libcanberra is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with libcanberra. If not, see
  <http://www.gnu.org/licenses/>.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <stdlib.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <gst/gst.h>

#include "canberra.h"
#include "common.h"
#include "driver.h"
#include "llist.h"
#include "read-sound-file.h"
#include "sound-theme-spec.h"
#include "malloc.h"

struct outstanding {
        CA_LLIST_FIELDS(struct outstanding);
        ca_bool_t dead;
        uint32_t id;
        int err;
        ca_finish_callback_t callback;
        void *userdata;
        GstElement *pipeline;
        struct ca_context *context;
};

struct private {
        ca_theme_data *theme;
        ca_bool_t signal_semaphore;
        sem_t semaphore;

        GstBus *mgr_bus;

        /* Everything below protected by the outstanding_mutex */
        ca_mutex *outstanding_mutex;
        ca_bool_t mgr_thread_running;
        ca_bool_t semaphore_allocated;
        CA_LLIST_HEAD(struct outstanding, outstanding);
};

#define PRIVATE(c) ((struct private *) ((c)->private))

static void* thread_func(void *userdata);
static void send_eos_msg(struct outstanding *out, int err);
static void send_mgr_exit_msg (struct private *p);

static void outstanding_free(struct outstanding *o) {
        GstBus *bus;

        ca_assert(o);

        if (o->pipeline) {
                bus = gst_pipeline_get_bus(GST_PIPELINE (o->pipeline));
                if (bus != NULL) {
                        gst_bus_set_sync_handler(bus, NULL, NULL, NULL);
                        gst_object_unref(bus);
                }

                gst_object_unref(GST_OBJECT(o->pipeline));
        }

        ca_free(o);
}

int driver_open(ca_context *c) {
        GError *error = NULL;
        struct private *p;
        pthread_t thread;

        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(!PRIVATE(c), CA_ERROR_INVALID);
        ca_return_val_if_fail(!c->driver || ca_streq(c->driver, "gstreamer"), CA_ERROR_NODRIVER);

        gst_init_check(NULL, NULL, &error);
        if (error != NULL) {
                g_warning("gst_init: %s ", error->message);
                g_error_free(error);
                return CA_ERROR_INVALID;
        }

        if (!(p = ca_new0(struct private, 1)))
                return CA_ERROR_OOM;
        c->private = p;

        if (!(p->outstanding_mutex = ca_mutex_new())) {
                driver_destroy(c);
                return CA_ERROR_OOM;
        }

        if (sem_init(&p->semaphore, 0, 0) < 0) {
                driver_destroy(c);
                return CA_ERROR_OOM;
        }
        p->semaphore_allocated = TRUE;

        p->mgr_bus = gst_bus_new();
        if (p->mgr_bus == NULL) {
                driver_destroy(c);
                return CA_ERROR_OOM;
        }
        gst_bus_set_flushing(p->mgr_bus, FALSE);

        /* Give a reference to the bus to the mgr thread */
        if (pthread_create(&thread, NULL, thread_func, p) < 0) {
                driver_destroy(c);
                return CA_ERROR_OOM;
        }
        p->mgr_thread_running = TRUE;

        return CA_SUCCESS;
}

int driver_destroy(ca_context *c) {
        struct private *p;
        struct outstanding *out;

        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(PRIVATE(c), CA_ERROR_STATE);

        p = PRIVATE(c);

        if (p->outstanding_mutex) {
                ca_mutex_lock(p->outstanding_mutex);

                /* Tell all player threads to terminate */
                out = p->outstanding;
                while (out) {
                        if (!out->dead)
                                send_eos_msg(out, CA_ERROR_DESTROYED);
                        out = out->next;
                }

                /* Now that we've sent EOS for all pending players, append a
                 * message to wait for the mgr thread to exit */
                if (p->mgr_thread_running && p->semaphore_allocated) {
                        send_mgr_exit_msg(p);

                        p->signal_semaphore = TRUE;
                        while (p->mgr_thread_running) {
                                ca_mutex_unlock(p->outstanding_mutex);
                                sem_wait(&p->semaphore);
                                ca_mutex_lock(p->outstanding_mutex);
                        }
                }

                ca_mutex_unlock(p->outstanding_mutex);
                ca_mutex_free(p->outstanding_mutex);
        }

        if (p->mgr_bus)
                g_object_unref(p->mgr_bus);

        if (p->theme)
                ca_theme_data_free(p->theme);

        if (p->semaphore_allocated)
                sem_destroy(&p->semaphore);

        ca_free(p);

        /* no gst_deinit(), see doc */

        return CA_SUCCESS;
}

int driver_change_device(ca_context *c, const char *device) {
        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(PRIVATE(c), CA_ERROR_STATE);

        return CA_SUCCESS;
}

int driver_change_props(ca_context *c, ca_proplist *changed, ca_proplist *merged) {
        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(changed, CA_ERROR_INVALID);
        ca_return_val_if_fail(merged, CA_ERROR_INVALID);
        ca_return_val_if_fail(PRIVATE(c), CA_ERROR_STATE);

        return CA_SUCCESS;
}

static void
send_eos_msg(struct outstanding *out, int err) {
        struct private *p;
        GstMessage *m;
        GstStructure *s;

        out->dead = TRUE;
        out->err = err;

        p = PRIVATE(out->context);
        s = gst_structure_new("application/eos", "info", G_TYPE_POINTER, out, NULL);
        m = gst_message_new_application (GST_OBJECT (out->pipeline), s);

        gst_bus_post (p->mgr_bus, m);
}

static GstBusSyncReply
bus_cb(GstBus *bus, GstMessage *message, gpointer data) {
        int err;
        struct outstanding *out;
        struct private *p;

        ca_return_val_if_fail(bus, GST_BUS_DROP);
        ca_return_val_if_fail(message, GST_BUS_DROP);
        ca_return_val_if_fail(data, GST_BUS_DROP);

        out = data;
        p = PRIVATE(out->context);

        switch (GST_MESSAGE_TYPE(message)) {
                /* for all elements */
        case GST_MESSAGE_ERROR:
                err = CA_ERROR_SYSTEM;
                break;
        case GST_MESSAGE_EOS:
                /* only respect EOS from the toplevel pipeline */
                if (GST_OBJECT(out->pipeline) != GST_MESSAGE_SRC(message))
                        return GST_BUS_PASS;

                err = CA_SUCCESS;
                break;
        default:
                return GST_BUS_PASS;
        }

        /* Bin finished playback: ask the manager thread to shut it
         * down, since we can't from the sync message handler */
        ca_mutex_lock(p->outstanding_mutex);
        if (!out->dead)
                send_eos_msg(out, err);
        ca_mutex_unlock(p->outstanding_mutex);

        return GST_BUS_PASS;
}

struct ca_sound_file {
        GstElement *fdsrc;
};

static int ca_gst_sound_file_open(ca_sound_file **_f, const char *fn) {
        int fd;
        ca_sound_file *f;

        ca_return_val_if_fail(_f, CA_ERROR_INVALID);
        ca_return_val_if_fail(fn, CA_ERROR_INVALID);

        if ((fd = open(fn, O_RDONLY)) == -1)
                return errno == ENOENT ? CA_ERROR_NOTFOUND : CA_ERROR_SYSTEM;

        if (!(f = ca_new0(ca_sound_file, 1))) {
                close(fd);
                return CA_ERROR_OOM;
        }

        if (!(f->fdsrc = gst_element_factory_make("fdsrc", NULL))) {
                close(fd);
                ca_free(f);
                return CA_ERROR_OOM;
        }

        g_object_set(GST_OBJECT(f->fdsrc), "fd", fd, NULL);
        *_f = f;

        return CA_SUCCESS;
}

static void on_pad_added(GstElement *element, GstPad *pad, gboolean arg1, gpointer data)
{
        GstStructure *structure;
        GstElement *sinkelement;
        GstCaps *caps;
        GstPad *vpad;
        const char *type;

        sinkelement = GST_ELEMENT(data);

        caps = gst_pad_query_caps(pad, NULL);
        if (gst_caps_is_empty(caps) || gst_caps_is_any(caps)) {
                gst_caps_unref(caps);
                return;
        }

        structure = gst_caps_get_structure(caps, 0);
        type = gst_structure_get_name(structure);
        if (g_str_has_prefix(type, "audio/x-raw") == TRUE) {
                vpad = gst_element_get_static_pad(sinkelement, "sink");
                gst_pad_link(pad, vpad);
                gst_object_unref(vpad);
        }
        gst_caps_unref(caps);
}

static void
send_mgr_exit_msg (struct private *p) {
        GstMessage *m;
        GstStructure *s;

        s = gst_structure_new("application/mgr-exit", NULL);
        m = gst_message_new_application (NULL, s);

        gst_bus_post (p->mgr_bus, m);
}

/* Global manager thread that shuts down GStreamer pipelines when ordered */
static void* thread_func(void *userdata) {
        struct private *p = userdata;
        GstBus *bus = g_object_ref(p->mgr_bus);

        pthread_detach(pthread_self());

        /* Pop messages from the manager bus until we see an exit command */
        do {
                GstMessage *m = gst_bus_timed_pop(bus, GST_CLOCK_TIME_NONE);
                const GstStructure *s;
                const GValue *v;
                struct outstanding *out;

                if (m == NULL)
                        break;
                if (GST_MESSAGE_TYPE(m) != GST_MESSAGE_APPLICATION) {
                        gst_message_unref (m);
                        break;
                }

                s = gst_message_get_structure(m);
                if (gst_structure_has_name(s, "application/mgr-exit")) {
                        gst_message_unref (m);
                        break;
                }

                /* Otherwise, this must be an EOS message for an outstanding pipe */
                ca_assert(gst_structure_has_name(s, "application/eos"));
                v  = gst_structure_get_value(s, "info");
                ca_assert(v);
                out = g_value_get_pointer(v);
                ca_assert(out);

                /* Set pipeline back to NULL to close things. By the time this
                 * completes, we can be sure bus_cb won't be called */
                if (gst_element_set_state(out->pipeline, GST_STATE_NULL) ==
                    GST_STATE_CHANGE_FAILURE) {
                        gst_message_unref (m);
                        break;
                }
                if (out->callback)
                        out->callback(out->context, out->id, out->err, out->userdata);

                ca_mutex_lock(p->outstanding_mutex);
                CA_LLIST_REMOVE(struct outstanding, p->outstanding, out);
                outstanding_free(out);
                ca_mutex_unlock(p->outstanding_mutex);

                gst_message_unref(m);
        } while (TRUE);

        /* Signal the semaphore and exit */
        ca_mutex_lock(p->outstanding_mutex);
        if (p->signal_semaphore)
                sem_post(&p->semaphore);
        p->mgr_thread_running = FALSE;
        ca_mutex_unlock(p->outstanding_mutex);

        gst_bus_set_flushing(bus, TRUE);
        g_object_unref (bus);
        return NULL;
}


int driver_play(ca_context *c, uint32_t id, ca_proplist *proplist, ca_finish_callback_t cb, void *userdata) {
        struct private *p;
        struct outstanding *out;
        ca_sound_file *f;
        GstElement *decodebin, *sink, *audioconvert, *audioresample, *abin;
        GstBus *bus;
        GstPad *audiopad;
        int ret;

        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(proplist, CA_ERROR_INVALID);
        ca_return_val_if_fail(!userdata || cb, CA_ERROR_INVALID);

        out = NULL;
        f = NULL;
        sink = NULL;
        decodebin = NULL;
        audioconvert = NULL;
        audioresample = NULL;
        abin = NULL;
        p = PRIVATE(c);

        if ((ret = ca_lookup_sound_with_callback(&f, ca_gst_sound_file_open, NULL, &p->theme, c->props, proplist)) < 0)
                goto fail;

        if (!(out = ca_new0(struct outstanding, 1)))
                return CA_ERROR_OOM;

        out->id = id;
        out->callback = cb;
        out->userdata = userdata;
        out->context = c;

        if (!(out->pipeline = gst_pipeline_new(NULL))
            || !(decodebin = gst_element_factory_make("decodebin2", NULL))
            || !(audioconvert = gst_element_factory_make("audioconvert", NULL))
            || !(audioresample = gst_element_factory_make("audioresample", NULL))
            || !(sink = gst_element_factory_make("autoaudiosink", NULL))
            || !(abin = gst_bin_new ("audiobin"))) {

                /* At this point, if there is a failure, free each plugin separately. */
                if (out->pipeline != NULL)
                        g_object_unref (out->pipeline);
                if (decodebin != NULL)
                        g_object_unref(decodebin);
                if (audioconvert != NULL)
                        g_object_unref(audioconvert);
                if (audioresample != NULL)
                        g_object_unref(audioresample);
                if (sink != NULL)
                        g_object_unref(sink);
                if (abin != NULL)
                        g_object_unref(abin);

                ca_free(out);

                ret = CA_ERROR_OOM;
                goto fail;
        }

        bus = gst_pipeline_get_bus(GST_PIPELINE (out->pipeline));
        gst_bus_set_sync_handler(bus, bus_cb, out, NULL);
        gst_object_unref(bus);

        g_signal_connect(decodebin, "new-decoded-pad",
                         G_CALLBACK (on_pad_added), abin);
        gst_bin_add_many(GST_BIN (abin), audioconvert, audioresample, sink, NULL);
        gst_element_link_many(audioconvert, audioresample, sink, NULL);

        audiopad = gst_element_get_static_pad(audioconvert, "sink");
        gst_element_add_pad(abin, gst_ghost_pad_new("sink", audiopad));
        gst_object_unref(audiopad);

        gst_bin_add_many(GST_BIN (out->pipeline),
                         f->fdsrc, decodebin, abin, NULL);
        if (!gst_element_link(f->fdsrc, decodebin)) {
                /* Bin now owns the fdsrc... */
                f->fdsrc = NULL;

                outstanding_free(out);
                ret = CA_ERROR_OOM;
                goto fail;
        }
        /* Bin now owns the fdsrc... */
        f->fdsrc = NULL;

        ca_free(f);
        f = NULL;

        ca_mutex_lock(p->outstanding_mutex);
        CA_LLIST_PREPEND(struct outstanding, p->outstanding, out);
        ca_mutex_unlock(p->outstanding_mutex);

        if (gst_element_set_state(out->pipeline,
                                  GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
                ret = CA_ERROR_NOTAVAILABLE;
                goto fail;
        }

        return CA_SUCCESS;

fail:
        if (f && f->fdsrc)
                gst_object_unref(f->fdsrc);

        if (f)
                ca_free(f);

        return ret;
}

int driver_cancel(ca_context *c, uint32_t id) {
        struct private *p;
        struct outstanding *out = NULL;

        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(PRIVATE(c), CA_ERROR_STATE);

        p = PRIVATE(c);

        ca_mutex_lock(p->outstanding_mutex);

        for (out = p->outstanding; out;/* out = out->next*/) {
                struct outstanding *next;

                if (out->id != id || out->pipeline == NULL || out->dead == TRUE) {
                        out = out->next;
                        continue;
                }

                if (gst_element_set_state(out->pipeline, GST_STATE_NULL) ==
                    GST_STATE_CHANGE_FAILURE)
                        goto error;

                if (out->callback)
                        out->callback(c, out->id, CA_ERROR_CANCELED, out->userdata);
                next = out->next;
                CA_LLIST_REMOVE(struct outstanding, p->outstanding, out);
                outstanding_free(out);
                out = next;
        }

        ca_mutex_unlock(p->outstanding_mutex);

        return CA_SUCCESS;

error:
        ca_mutex_unlock(p->outstanding_mutex);
        return CA_ERROR_SYSTEM;
}

int driver_cache(ca_context *c, ca_proplist *proplist) {
        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(proplist, CA_ERROR_INVALID);
        ca_return_val_if_fail(PRIVATE(c), CA_ERROR_STATE);

        return CA_ERROR_NOTSUPPORTED;
}

int driver_playing(ca_context *c, uint32_t id, int *playing) {
        struct private *p;
        struct outstanding *out;

        ca_return_val_if_fail(c, CA_ERROR_INVALID);
        ca_return_val_if_fail(c->private, CA_ERROR_STATE);
        ca_return_val_if_fail(playing, CA_ERROR_INVALID);

        p = PRIVATE(c);

        *playing = 0;

        ca_mutex_lock(p->outstanding_mutex);

        for (out = p->outstanding; out; out = out->next) {

                if (out->id != id || out->pipeline == NULL || out->dead == TRUE)
                        continue;

                *playing = 1;
                break;
        }

        ca_mutex_unlock(p->outstanding_mutex);

        return CA_SUCCESS;
}