1 /*
2 *
3 * GStreamer
4 * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include <gst/gst.h>
27
28 #include "gstglelements.h"
29 #include "gstglmixerbin.h"
30
31 #define GST_CAT_DEFAULT gst_gl_mixer_bin_debug
32 GST_DEBUG_CATEGORY (gst_gl_mixer_bin_debug);
33
34 #define DEFAULT_LATENCY 0
35 #define DEFAULT_START_TIME_SELECTION 0
36 #define DEFAULT_START_TIME (-1)
37
38 typedef enum
39 {
40 GST_GL_MIXER_BIN_START_TIME_SELECTION_ZERO,
41 GST_GL_MIXER_BIN_START_TIME_SELECTION_FIRST,
42 GST_GL_MIXER_BIN_START_TIME_SELECTION_SET
43 } GstGLMixerBinStartTimeSelection;
44
45 #define GST_TYPE_GL_MIXER_BIN_START_TIME_SELECTION (gst_gl_mixer_bin_start_time_selection_get_type())
46 static GType
gst_gl_mixer_bin_start_time_selection_get_type(void)47 gst_gl_mixer_bin_start_time_selection_get_type (void)
48 {
49 static GType gtype = 0;
50
51 if (gtype == 0) {
52 static const GEnumValue values[] = {
53 {GST_GL_MIXER_BIN_START_TIME_SELECTION_ZERO,
54 "Start at 0 running time (default)", "zero"},
55 {GST_GL_MIXER_BIN_START_TIME_SELECTION_FIRST,
56 "Start at first observed input running time", "first"},
57 {GST_GL_MIXER_BIN_START_TIME_SELECTION_SET,
58 "Set start time with start-time property", "set"},
59 {0, NULL, NULL}
60 };
61
62 gtype = g_enum_register_static ("GstGLMixerBinStartTimeSelection", values);
63 }
64 return gtype;
65 }
66
67 struct input_chain
68 {
69 GstGLMixerBin *self;
70 GstGhostPad *ghost_pad;
71 GstElement *upload;
72 GstElement *in_convert;
73 GstElement *in_overlay;
74 GstPad *mixer_pad;
75 };
76
77 static void
_free_input_chain(struct input_chain * chain)78 _free_input_chain (struct input_chain *chain)
79 {
80 if (!chain)
81 return;
82
83 chain->ghost_pad = NULL;
84
85 if (chain->upload) {
86 gst_element_set_state (chain->upload, GST_STATE_NULL);
87 gst_bin_remove (GST_BIN (chain->self), chain->upload);
88 chain->upload = NULL;
89 }
90
91 if (chain->in_convert) {
92 gst_element_set_state (chain->in_convert, GST_STATE_NULL);
93 gst_bin_remove (GST_BIN (chain->self), chain->in_convert);
94 chain->in_convert = NULL;
95 }
96
97 if (chain->in_overlay) {
98 gst_element_set_state (chain->in_overlay, GST_STATE_NULL);
99 gst_bin_remove (GST_BIN (chain->self), chain->in_overlay);
100 chain->in_overlay = NULL;
101 }
102
103 if (chain->mixer_pad) {
104 gst_element_release_request_pad (chain->self->mixer, chain->mixer_pad);
105 gst_object_unref (chain->mixer_pad);
106 chain->mixer_pad = NULL;
107 }
108
109 g_free (chain);
110 }
111
112 struct _GstGLMixerBinPrivate
113 {
114 gboolean running;
115
116 GList *input_chains;
117 };
118
119 enum
120 {
121 PROP_0,
122 PROP_MIXER,
123 PROP_LATENCY,
124 PROP_START_TIME_SELECTION,
125 PROP_START_TIME,
126 PROP_CONTEXT,
127 };
128
129 enum
130 {
131 SIGNAL_0,
132 SIGNAL_CREATE_ELEMENT,
133 LAST_SIGNAL
134 };
135
136 static void gst_gl_mixer_bin_child_proxy_init (gpointer g_iface,
137 gpointer iface_data);
138
139 G_DEFINE_TYPE_WITH_CODE (GstGLMixerBin, gst_gl_mixer_bin, GST_TYPE_BIN,
140 G_ADD_PRIVATE (GstGLMixerBin)
141 G_IMPLEMENT_INTERFACE (GST_TYPE_CHILD_PROXY,
142 gst_gl_mixer_bin_child_proxy_init));
143 GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (glmixerbin, "glmixerbin",
144 GST_RANK_NONE, GST_TYPE_GL_MIXER_BIN, gl_element_init (plugin));
145
146 static guint gst_gl_mixer_bin_signals[LAST_SIGNAL] = { 0 };
147
148 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
149 GST_PAD_SRC,
150 GST_PAD_ALWAYS,
151 GST_STATIC_CAPS ("video/x-raw(ANY)")
152 );
153
154 static void gst_gl_mixer_bin_set_property (GObject * object, guint prop_id,
155 const GValue * value, GParamSpec * pspec);
156 static void gst_gl_mixer_bin_get_property (GObject * object, guint prop_id,
157 GValue * value, GParamSpec * pspec);
158 static void gst_gl_mixer_bin_dispose (GObject * object);
159
160 static GstPad *gst_gl_mixer_bin_request_new_pad (GstElement * element,
161 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps);
162 static void gst_gl_mixer_bin_release_pad (GstElement * element, GstPad * pad);
163 static GstStateChangeReturn gst_gl_mixer_bin_change_state (GstElement *
164 element, GstStateChange transition);
165
166 static void
gst_gl_mixer_bin_class_init(GstGLMixerBinClass * klass)167 gst_gl_mixer_bin_class_init (GstGLMixerBinClass * klass)
168 {
169 GObjectClass *gobject_class = (GObjectClass *) klass;
170 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
171 GstCaps *upload_caps;
172
173 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glmixerbin", 0,
174 "opengl mixer bin");
175
176 element_class->request_new_pad = gst_gl_mixer_bin_request_new_pad;
177 element_class->release_pad = gst_gl_mixer_bin_release_pad;
178 element_class->change_state = gst_gl_mixer_bin_change_state;
179
180 gobject_class->get_property = gst_gl_mixer_bin_get_property;
181 gobject_class->set_property = gst_gl_mixer_bin_set_property;
182 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_gl_mixer_bin_dispose);
183
184 g_object_class_install_property (gobject_class, PROP_MIXER,
185 g_param_spec_object ("mixer",
186 "GL mixer element",
187 "The GL mixer chain to use",
188 GST_TYPE_ELEMENT,
189 GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
190 G_PARAM_STATIC_STRINGS));
191
192 g_object_class_install_property (gobject_class, PROP_LATENCY,
193 g_param_spec_uint64 ("latency", "Buffer latency",
194 "Additional latency in live mode to allow upstream "
195 "to take longer to produce buffers for the current "
196 "position (in nanoseconds)", 0, G_MAXUINT64,
197 DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
198
199 g_object_class_install_property (gobject_class, PROP_START_TIME_SELECTION,
200 g_param_spec_enum ("start-time-selection", "Start Time Selection",
201 "Decides which start time is output",
202 GST_TYPE_GL_MIXER_BIN_START_TIME_SELECTION,
203 DEFAULT_START_TIME_SELECTION,
204 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
205
206 g_object_class_install_property (gobject_class, PROP_START_TIME,
207 g_param_spec_uint64 ("start-time", "Start Time",
208 "Start time to use if start-time-selection=set", 0,
209 G_MAXUINT64,
210 DEFAULT_START_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
211
212 g_object_class_install_property (gobject_class, PROP_CONTEXT,
213 g_param_spec_object ("context",
214 "OpenGL context",
215 "Get OpenGL context",
216 GST_TYPE_GL_CONTEXT, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
217
218 /**
219 * GstMixerBin::create-element:
220 * @object: the #GstGLMixerBin
221 *
222 * Will be emitted when we need the processing element/s that this bin will use
223 *
224 * Returns: a new #GstElement
225 */
226 gst_gl_mixer_bin_signals[SIGNAL_CREATE_ELEMENT] =
227 g_signal_new ("create-element", G_TYPE_FROM_CLASS (klass),
228 G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, GST_TYPE_ELEMENT, 0);
229
230 gst_element_class_add_static_pad_template (element_class, &src_factory);
231
232 upload_caps = gst_gl_upload_get_input_template_caps ();
233 gst_element_class_add_pad_template (element_class,
234 gst_pad_template_new ("sink_%u", GST_PAD_SINK, GST_PAD_REQUEST,
235 upload_caps));
236 gst_caps_unref (upload_caps);
237
238 gst_element_class_set_metadata (element_class, "OpenGL video_mixer empty bin",
239 "Bin/Filter/Effect/Video/Mixer", "OpenGL video_mixer empty bin",
240 "Matthew Waters <matthew@centricular.com>");
241
242 gst_type_mark_as_plugin_api (GST_TYPE_GL_MIXER_BIN_START_TIME_SELECTION, 0);
243 }
244
245 static void
gst_gl_mixer_bin_init(GstGLMixerBin * self)246 gst_gl_mixer_bin_init (GstGLMixerBin * self)
247 {
248 gboolean res = TRUE;
249 GstPad *pad;
250
251 self->priv = gst_gl_mixer_bin_get_instance_private (self);
252
253 self->out_convert = gst_element_factory_make ("glcolorconvert", NULL);
254 self->download = gst_element_factory_make ("gldownload", NULL);
255 res &= gst_bin_add (GST_BIN (self), self->out_convert);
256 res &= gst_bin_add (GST_BIN (self), self->download);
257
258 res &=
259 gst_element_link_pads (self->out_convert, "src", self->download, "sink");
260
261 pad = gst_element_get_static_pad (self->download, "src");
262 if (!pad) {
263 res = FALSE;
264 } else {
265 GST_DEBUG_OBJECT (self, "setting target src pad %" GST_PTR_FORMAT, pad);
266 self->srcpad = gst_ghost_pad_new ("src", pad);
267 gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
268 gst_object_unref (pad);
269 }
270
271 if (!res)
272 GST_ERROR_OBJECT (self, "failed to create output chain");
273 }
274
275 static void
gst_gl_mixer_bin_dispose(GObject * object)276 gst_gl_mixer_bin_dispose (GObject * object)
277 {
278 GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
279 GList *l = self->priv->input_chains;
280
281 while (l) {
282 struct input_chain *chain = l->data;
283
284 if (self->mixer && chain->mixer_pad) {
285 gst_element_release_request_pad (GST_ELEMENT (self->mixer),
286 chain->mixer_pad);
287 gst_object_unref (chain->mixer_pad);
288 chain->mixer_pad = NULL;
289 }
290
291 l = l->next;
292 }
293
294 g_list_free_full (self->priv->input_chains, (GDestroyNotify) g_free);
295
296 G_OBJECT_CLASS (gst_gl_mixer_bin_parent_class)->dispose (object);
297 }
298
299 static gboolean
_create_input_chain(GstGLMixerBin * self,struct input_chain * chain,GstPad * mixer_pad)300 _create_input_chain (GstGLMixerBin * self, struct input_chain *chain,
301 GstPad * mixer_pad)
302 {
303 GstGLMixerBinClass *klass = GST_GL_MIXER_BIN_GET_CLASS (self);
304 GstPad *pad;
305 gboolean res = TRUE;
306 gchar *name;
307
308 chain->self = self;
309 chain->mixer_pad = mixer_pad;
310
311 chain->upload = gst_element_factory_make ("glupload", NULL);
312 chain->in_convert = gst_element_factory_make ("glcolorconvert", NULL);
313 chain->in_overlay = gst_element_factory_make ("gloverlaycompositor", NULL);
314
315 res &= gst_bin_add (GST_BIN (self), chain->in_convert);
316 res &= gst_bin_add (GST_BIN (self), chain->in_overlay);
317 res &= gst_bin_add (GST_BIN (self), chain->upload);
318 if (!res) {
319 g_warn_if_reached ();
320 return FALSE;
321 }
322
323 pad = gst_element_get_static_pad (chain->in_overlay, "src");
324 if (gst_pad_link (pad, mixer_pad) != GST_PAD_LINK_OK) {
325 gst_object_unref (pad);
326 return FALSE;
327 }
328 gst_object_unref (pad);
329 if (!gst_element_link_pads (chain->in_convert, "src", chain->in_overlay,
330 "sink")) {
331 g_warn_if_reached ();
332 return FALSE;
333 }
334 if (!gst_element_link_pads (chain->upload, "src", chain->in_convert, "sink")) {
335 g_warn_if_reached ();
336 return FALSE;
337 }
338
339 pad = gst_element_get_static_pad (chain->upload, "sink");
340 if (!pad) {
341 return FALSE;
342 } else {
343 GST_DEBUG_OBJECT (self, "setting target sink pad %" GST_PTR_FORMAT, pad);
344 name = gst_object_get_name (GST_OBJECT (mixer_pad));
345 if (klass->create_input_pad) {
346 chain->ghost_pad = klass->create_input_pad (self, chain->mixer_pad);
347 gst_object_set_name (GST_OBJECT (chain->ghost_pad), name);
348 gst_ghost_pad_set_target (chain->ghost_pad, pad);
349 } else {
350 chain->ghost_pad =
351 GST_GHOST_PAD (gst_ghost_pad_new (GST_PAD_NAME (chain->mixer_pad),
352 pad));
353 }
354 g_free (name);
355
356 GST_OBJECT_LOCK (self);
357 if (self->priv->running)
358 gst_pad_set_active (GST_PAD (chain->ghost_pad), TRUE);
359 GST_OBJECT_UNLOCK (self);
360
361 gst_element_add_pad (GST_ELEMENT_CAST (self), GST_PAD (chain->ghost_pad));
362 gst_object_unref (pad);
363 }
364
365 gst_element_sync_state_with_parent (chain->upload);
366 gst_element_sync_state_with_parent (chain->in_convert);
367 gst_element_sync_state_with_parent (chain->in_overlay);
368
369 return TRUE;
370 }
371
372 static GstPadTemplate *
_find_element_pad_template(GstElement * element,GstPadDirection direction,GstPadPresence presence)373 _find_element_pad_template (GstElement * element,
374 GstPadDirection direction, GstPadPresence presence)
375 {
376 GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
377 GList *templ_list = gst_element_class_get_pad_template_list (klass);
378 GstPadTemplate *templ;
379
380 /* find suitable template */
381 while (templ_list) {
382 templ = (GstPadTemplate *) templ_list->data;
383
384 if (GST_PAD_TEMPLATE_DIRECTION (templ) != direction
385 || GST_PAD_TEMPLATE_PRESENCE (templ) != presence) {
386 templ_list = templ_list->next;
387 templ = NULL;
388 continue;
389 }
390
391 break;
392 }
393
394 return templ;
395 }
396
397 static gboolean
_connect_mixer_element(GstGLMixerBin * self)398 _connect_mixer_element (GstGLMixerBin * self)
399 {
400 gboolean res = TRUE;
401
402 g_return_val_if_fail (self->priv->input_chains == NULL, FALSE);
403
404 gst_object_set_name (GST_OBJECT (self->mixer), "mixer");
405 res &= gst_bin_add (GST_BIN (self), self->mixer);
406
407 res &= gst_element_link_pads (self->mixer, "src", self->out_convert, "sink");
408
409 if (!res)
410 GST_ERROR_OBJECT (self, "Failed to link mixer element into the pipeline");
411
412 gst_element_sync_state_with_parent (self->mixer);
413
414 return res;
415 }
416
417 void
gst_gl_mixer_bin_finish_init_with_element(GstGLMixerBin * self,GstElement * element)418 gst_gl_mixer_bin_finish_init_with_element (GstGLMixerBin * self,
419 GstElement * element)
420 {
421 g_return_if_fail (GST_IS_ELEMENT (element));
422
423 self->mixer = element;
424
425 if (!_connect_mixer_element (self)) {
426 gst_object_unref (self->mixer);
427 self->mixer = NULL;
428 }
429 }
430
431 void
gst_gl_mixer_bin_finish_init(GstGLMixerBin * self)432 gst_gl_mixer_bin_finish_init (GstGLMixerBin * self)
433 {
434 GstGLMixerBinClass *klass = GST_GL_MIXER_BIN_GET_CLASS (self);
435 GstElement *element = NULL;
436
437 if (klass->create_element)
438 element = klass->create_element ();
439
440 if (element)
441 gst_gl_mixer_bin_finish_init_with_element (self, element);
442 }
443
444 static void
gst_gl_mixer_bin_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)445 gst_gl_mixer_bin_get_property (GObject * object,
446 guint prop_id, GValue * value, GParamSpec * pspec)
447 {
448 GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
449
450 switch (prop_id) {
451 case PROP_MIXER:
452 g_value_set_object (value, self->mixer);
453 break;
454 default:
455 if (self->mixer)
456 g_object_get_property (G_OBJECT (self->mixer), pspec->name, value);
457 break;
458 }
459 }
460
461 static void
gst_gl_mixer_bin_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)462 gst_gl_mixer_bin_set_property (GObject * object,
463 guint prop_id, const GValue * value, GParamSpec * pspec)
464 {
465 GstGLMixerBin *self = GST_GL_MIXER_BIN (object);
466
467 switch (prop_id) {
468 case PROP_MIXER:
469 {
470 GstElement *mixer = g_value_get_object (value);
471 /* FIXME: deal with replacing a mixer */
472 g_return_if_fail (!self->mixer || (self->mixer == mixer));
473 self->mixer = mixer;
474 if (mixer) {
475 gst_object_ref_sink (mixer);
476 _connect_mixer_element (self);
477 }
478 break;
479 }
480 default:
481 if (self->mixer)
482 g_object_set_property (G_OBJECT (self->mixer), pspec->name, value);
483 break;
484 }
485 }
486
487 static GstPad *
gst_gl_mixer_bin_request_new_pad(GstElement * element,GstPadTemplate * templ,const gchar * req_name,const GstCaps * caps)488 gst_gl_mixer_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
489 const gchar * req_name, const GstCaps * caps)
490 {
491 GstGLMixerBin *self = GST_GL_MIXER_BIN (element);
492 GstPadTemplate *mixer_templ;
493 struct input_chain *chain;
494 GstPad *mixer_pad;
495
496 chain = g_new0 (struct input_chain, 1);
497
498 mixer_templ = _find_element_pad_template (self->mixer,
499 GST_PAD_TEMPLATE_DIRECTION (templ), GST_PAD_TEMPLATE_PRESENCE (templ));
500 g_return_val_if_fail (mixer_templ, NULL);
501
502 mixer_pad =
503 gst_element_request_pad (self->mixer, mixer_templ, req_name, NULL);
504 g_return_val_if_fail (mixer_pad, NULL);
505
506 if (!_create_input_chain (self, chain, mixer_pad)) {
507 gst_element_release_request_pad (self->mixer, mixer_pad);
508 _free_input_chain (chain);
509 return NULL;
510 }
511
512 GST_OBJECT_LOCK (element);
513 self->priv->input_chains = g_list_prepend (self->priv->input_chains, chain);
514 GST_OBJECT_UNLOCK (element);
515
516 gst_child_proxy_child_added (GST_CHILD_PROXY (self),
517 G_OBJECT (chain->ghost_pad), GST_OBJECT_NAME (chain->ghost_pad));
518
519 return GST_PAD (chain->ghost_pad);
520 }
521
522 static void
gst_gl_mixer_bin_release_pad(GstElement * element,GstPad * pad)523 gst_gl_mixer_bin_release_pad (GstElement * element, GstPad * pad)
524 {
525 GstGLMixerBin *self = GST_GL_MIXER_BIN (element);
526 GList *l = self->priv->input_chains;
527 gboolean released = FALSE;
528
529 GST_OBJECT_LOCK (element);
530 while (l) {
531 struct input_chain *chain = l->data;
532 if (GST_PAD (chain->ghost_pad) == pad) {
533 self->priv->input_chains =
534 g_list_delete_link (self->priv->input_chains, l);
535 GST_OBJECT_UNLOCK (element);
536
537 _free_input_chain (chain);
538 gst_element_remove_pad (element, pad);
539 released = TRUE;
540 break;
541 }
542 l = l->next;
543 }
544 if (!released)
545 GST_OBJECT_UNLOCK (element);
546 }
547
548 static GstStateChangeReturn
gst_gl_mixer_bin_change_state(GstElement * element,GstStateChange transition)549 gst_gl_mixer_bin_change_state (GstElement * element, GstStateChange transition)
550 {
551 GstGLMixerBin *self = GST_GL_MIXER_BIN (element);
552 GstGLMixerBinClass *klass = GST_GL_MIXER_BIN_GET_CLASS (self);
553 GstStateChangeReturn ret;
554
555 switch (transition) {
556 case GST_STATE_CHANGE_NULL_TO_READY:
557 GST_OBJECT_LOCK (element);
558 if (!self->mixer) {
559 if (klass->create_element)
560 self->mixer = klass->create_element ();
561
562 if (!self->mixer)
563 g_signal_emit (element,
564 gst_gl_mixer_bin_signals[SIGNAL_CREATE_ELEMENT], 0, &self->mixer);
565
566 if (!self->mixer) {
567 GST_ERROR_OBJECT (element, "Failed to retrieve element");
568 GST_OBJECT_UNLOCK (element);
569 return GST_STATE_CHANGE_FAILURE;
570 }
571 GST_OBJECT_UNLOCK (element);
572 if (!_connect_mixer_element (self))
573 return GST_STATE_CHANGE_FAILURE;
574
575 GST_OBJECT_LOCK (element);
576 }
577 self->priv->running = TRUE;
578 GST_OBJECT_UNLOCK (element);
579 break;
580 default:
581 break;
582 }
583
584 ret =
585 GST_ELEMENT_CLASS (gst_gl_mixer_bin_parent_class)->change_state (element,
586 transition);
587 if (ret == GST_STATE_CHANGE_FAILURE)
588 return ret;
589
590 switch (transition) {
591 case GST_STATE_CHANGE_READY_TO_NULL:
592 GST_OBJECT_LOCK (self);
593 self->priv->running = FALSE;
594 GST_OBJECT_UNLOCK (self);
595 default:
596 break;
597 }
598
599 return ret;
600 }
601
602 static GObject *
gst_gl_mixer_bin_child_proxy_get_child_by_index(GstChildProxy * child_proxy,guint index)603 gst_gl_mixer_bin_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
604 guint index)
605 {
606 GstGLMixerBin *mixer = GST_GL_MIXER_BIN (child_proxy);
607 GstBin *bin = GST_BIN_CAST (child_proxy);
608 GObject *res = NULL;
609
610 GST_OBJECT_LOCK (bin);
611 /* XXX: not exactly thread safe with ordering */
612 if (index < bin->numchildren) {
613 if ((res = g_list_nth_data (bin->children, index)))
614 gst_object_ref (res);
615 } else {
616 struct input_chain *chain;
617 if ((chain =
618 g_list_nth_data (mixer->priv->input_chains,
619 index - bin->numchildren))) {
620 res = gst_object_ref (chain->ghost_pad);
621 }
622 }
623 GST_OBJECT_UNLOCK (bin);
624
625 return res;
626 }
627
628 static guint
gst_gl_mixer_bin_child_proxy_get_children_count(GstChildProxy * child_proxy)629 gst_gl_mixer_bin_child_proxy_get_children_count (GstChildProxy * child_proxy)
630 {
631 GstGLMixerBin *mixer = GST_GL_MIXER_BIN (child_proxy);
632 GstBin *bin = GST_BIN_CAST (child_proxy);
633 guint num;
634
635 GST_OBJECT_LOCK (bin);
636 num = bin->numchildren + g_list_length (mixer->priv->input_chains);
637 GST_OBJECT_UNLOCK (bin);
638
639 return num;
640 }
641
642 static void
gst_gl_mixer_bin_child_proxy_init(gpointer g_iface,gpointer iface_data)643 gst_gl_mixer_bin_child_proxy_init (gpointer g_iface, gpointer iface_data)
644 {
645 GstChildProxyInterface *iface = g_iface;
646
647 iface->get_children_count = gst_gl_mixer_bin_child_proxy_get_children_count;
648 iface->get_child_by_index = gst_gl_mixer_bin_child_proxy_get_child_by_index;
649 }
650