1 /* Generic video mixer plugin
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 #include <gst/video/video.h>
28
29 #include "gstglbasemixer.h"
30
31 #define GST_CAT_DEFAULT gst_gl_base_mixer_debug
32 GST_DEBUG_CATEGORY (gst_gl_base_mixer_debug);
33
34 static void gst_gl_base_mixer_pad_get_property (GObject * object, guint prop_id,
35 GValue * value, GParamSpec * pspec);
36 static void gst_gl_base_mixer_pad_set_property (GObject * object, guint prop_id,
37 const GValue * value, GParamSpec * pspec);
38
39 static void gst_gl_base_mixer_set_context (GstElement * element,
40 GstContext * context);
41 static GstStateChangeReturn gst_gl_base_mixer_change_state (GstElement *
42 element, GstStateChange transition);
43
44 struct _GstGLBaseMixerPrivate
45 {
46 gboolean negotiated;
47
48 GstGLContext *other_context;
49 };
50
51 #define gst_gl_base_mixer_parent_class parent_class
52 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GstGLBaseMixer, gst_gl_base_mixer,
53 GST_TYPE_VIDEO_AGGREGATOR);
54
55 G_DEFINE_TYPE (GstGLBaseMixerPad, gst_gl_base_mixer_pad,
56 GST_TYPE_VIDEO_AGGREGATOR_PAD);
57
58 static void
gst_gl_base_mixer_pad_class_init(GstGLBaseMixerPadClass * klass)59 gst_gl_base_mixer_pad_class_init (GstGLBaseMixerPadClass * klass)
60 {
61 GObjectClass *gobject_class = (GObjectClass *) klass;
62 GstVideoAggregatorPadClass *vaggpad_class =
63 (GstVideoAggregatorPadClass *) klass;
64
65 gobject_class->set_property = gst_gl_base_mixer_pad_set_property;
66 gobject_class->get_property = gst_gl_base_mixer_pad_get_property;
67
68 vaggpad_class->prepare_frame = NULL;
69 vaggpad_class->clean_frame = NULL;
70 }
71
72 static void
gst_gl_base_mixer_pad_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)73 gst_gl_base_mixer_pad_get_property (GObject * object, guint prop_id,
74 GValue * value, GParamSpec * pspec)
75 {
76 switch (prop_id) {
77 default:
78 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
79 break;
80 }
81 }
82
83 static void
gst_gl_base_mixer_pad_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)84 gst_gl_base_mixer_pad_set_property (GObject * object, guint prop_id,
85 const GValue * value, GParamSpec * pspec)
86 {
87 switch (prop_id) {
88 default:
89 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
90 break;
91 }
92 }
93
94
95 static gboolean
_find_local_gl_context(GstGLBaseMixer * mix)96 _find_local_gl_context (GstGLBaseMixer * mix)
97 {
98 if (gst_gl_query_local_gl_context (GST_ELEMENT (mix), GST_PAD_SRC,
99 &mix->context))
100 return TRUE;
101 if (gst_gl_query_local_gl_context (GST_ELEMENT (mix), GST_PAD_SINK,
102 &mix->context))
103 return TRUE;
104 return FALSE;
105 }
106
107 static gboolean
_get_gl_context(GstGLBaseMixer * mix)108 _get_gl_context (GstGLBaseMixer * mix)
109 {
110 GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
111 GError *error = NULL;
112
113 if (!gst_gl_ensure_element_data (mix, &mix->display,
114 &mix->priv->other_context))
115 return FALSE;
116
117 gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
118
119 _find_local_gl_context (mix);
120
121 GST_OBJECT_LOCK (mix->display);
122 if (!mix->context) {
123 do {
124 if (mix->context) {
125 gst_object_unref (mix->context);
126 mix->context = NULL;
127 }
128 /* just get a GL context. we don't care */
129 mix->context =
130 gst_gl_display_get_gl_context_for_thread (mix->display, NULL);
131 if (!mix->context) {
132 if (!gst_gl_display_create_context (mix->display,
133 mix->priv->other_context, &mix->context, &error)) {
134 GST_OBJECT_UNLOCK (mix->display);
135 goto context_error;
136 }
137 }
138 } while (!gst_gl_display_add_context (mix->display, mix->context));
139 }
140 GST_OBJECT_UNLOCK (mix->display);
141
142 {
143 GstGLAPI current_gl_api = gst_gl_context_get_gl_api (mix->context);
144 if ((current_gl_api & mix_class->supported_gl_api) == 0)
145 goto unsupported_gl_api;
146 }
147
148 return TRUE;
149
150 unsupported_gl_api:
151 {
152 GstGLAPI gl_api = gst_gl_context_get_gl_api (mix->context);
153 gchar *gl_api_str = gst_gl_api_to_string (gl_api);
154 gchar *supported_gl_api_str =
155 gst_gl_api_to_string (mix_class->supported_gl_api);
156 GST_ELEMENT_ERROR (mix, RESOURCE, BUSY,
157 ("GL API's not compatible context: %s supported: %s", gl_api_str,
158 supported_gl_api_str), (NULL));
159
160 g_free (supported_gl_api_str);
161 g_free (gl_api_str);
162 return FALSE;
163 }
164 context_error:
165 {
166 GST_ELEMENT_ERROR (mix, RESOURCE, NOT_FOUND, ("%s", error->message),
167 (NULL));
168 g_clear_error (&error);
169 return FALSE;
170 }
171 }
172
173 static gboolean
gst_gl_base_mixer_propose_allocation(GstAggregator * agg,GstAggregatorPad * aggpad,GstQuery * decide_query,GstQuery * query)174 gst_gl_base_mixer_propose_allocation (GstAggregator * agg,
175 GstAggregatorPad * aggpad, GstQuery * decide_query, GstQuery * query)
176 {
177 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
178
179 if (!_get_gl_context (mix))
180 return FALSE;
181
182 return TRUE;
183 }
184
185 static gboolean
gst_gl_base_mixer_sink_query(GstAggregator * agg,GstAggregatorPad * bpad,GstQuery * query)186 gst_gl_base_mixer_sink_query (GstAggregator * agg, GstAggregatorPad * bpad,
187 GstQuery * query)
188 {
189 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
190
191 GST_TRACE ("QUERY %" GST_PTR_FORMAT, query);
192
193 switch (GST_QUERY_TYPE (query)) {
194 case GST_QUERY_CONTEXT:
195 {
196 if (gst_gl_handle_context_query ((GstElement *) mix, query,
197 mix->display, mix->context, mix->priv->other_context))
198 return TRUE;
199 break;
200 }
201 default:
202 break;
203 }
204
205 return GST_AGGREGATOR_CLASS (parent_class)->sink_query (agg, bpad, query);;
206 }
207
208 static void
gst_gl_base_mixer_pad_init(GstGLBaseMixerPad * mixerpad)209 gst_gl_base_mixer_pad_init (GstGLBaseMixerPad * mixerpad)
210 {
211 }
212
213 /* GLBaseMixer signals and args */
214 enum
215 {
216 /* FILL ME */
217 LAST_SIGNAL
218 };
219
220 enum
221 {
222 PROP_0,
223 PROP_CONTEXT
224 };
225
226 static gboolean gst_gl_base_mixer_src_query (GstAggregator * agg,
227 GstQuery * query);
228
229 static gboolean
230 gst_gl_base_mixer_src_activate_mode (GstAggregator * aggregator,
231 GstPadMode mode, gboolean active);
232 static gboolean gst_gl_base_mixer_stop (GstAggregator * agg);
233 static gboolean gst_gl_base_mixer_start (GstAggregator * agg);
234
235 static void gst_gl_base_mixer_set_property (GObject * object, guint prop_id,
236 const GValue * value, GParamSpec * pspec);
237 static void gst_gl_base_mixer_get_property (GObject * object, guint prop_id,
238 GValue * value, GParamSpec * pspec);
239
240 static gboolean gst_gl_base_mixer_decide_allocation (GstAggregator * agg,
241 GstQuery * query);
242
243 static void
gst_gl_base_mixer_class_init(GstGLBaseMixerClass * klass)244 gst_gl_base_mixer_class_init (GstGLBaseMixerClass * klass)
245 {
246 GObjectClass *gobject_class;
247 GstElementClass *element_class;
248 GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
249
250 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glmixer", 0, "opengl mixer");
251
252 gobject_class = (GObjectClass *) klass;
253 element_class = GST_ELEMENT_CLASS (klass);
254
255 gobject_class->get_property = gst_gl_base_mixer_get_property;
256 gobject_class->set_property = gst_gl_base_mixer_set_property;
257
258 element_class->set_context =
259 GST_DEBUG_FUNCPTR (gst_gl_base_mixer_set_context);
260 element_class->change_state = gst_gl_base_mixer_change_state;
261
262 agg_class->sink_query = gst_gl_base_mixer_sink_query;
263 agg_class->src_query = gst_gl_base_mixer_src_query;
264 agg_class->src_activate = gst_gl_base_mixer_src_activate_mode;
265 agg_class->stop = gst_gl_base_mixer_stop;
266 agg_class->start = gst_gl_base_mixer_start;
267 agg_class->decide_allocation = gst_gl_base_mixer_decide_allocation;
268 agg_class->propose_allocation = gst_gl_base_mixer_propose_allocation;
269
270 g_object_class_install_property (gobject_class, PROP_CONTEXT,
271 g_param_spec_object ("context",
272 "OpenGL context",
273 "Get OpenGL context",
274 GST_TYPE_GL_CONTEXT, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
275
276 /* Register the pad class */
277 g_type_class_ref (GST_TYPE_GL_BASE_MIXER_PAD);
278
279 klass->supported_gl_api = GST_GL_API_ANY;
280 }
281
282 static void
gst_gl_base_mixer_init(GstGLBaseMixer * mix)283 gst_gl_base_mixer_init (GstGLBaseMixer * mix)
284 {
285 mix->priv = gst_gl_base_mixer_get_instance_private (mix);
286 }
287
288 static void
gst_gl_base_mixer_set_context(GstElement * element,GstContext * context)289 gst_gl_base_mixer_set_context (GstElement * element, GstContext * context)
290 {
291 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
292 GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
293
294 gst_gl_handle_set_context (element, context, &mix->display,
295 &mix->priv->other_context);
296
297 if (mix->display)
298 gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
299
300 GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
301 }
302
303 static gboolean
gst_gl_base_mixer_activate(GstGLBaseMixer * mix,gboolean active)304 gst_gl_base_mixer_activate (GstGLBaseMixer * mix, gboolean active)
305 {
306 GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
307 gboolean result = TRUE;
308
309 if (active) {
310 if (!gst_gl_ensure_element_data (mix, &mix->display,
311 &mix->priv->other_context))
312 return FALSE;
313
314 gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
315 }
316
317 return result;
318 }
319
320 static gboolean
gst_gl_base_mixer_src_activate_mode(GstAggregator * aggregator,GstPadMode mode,gboolean active)321 gst_gl_base_mixer_src_activate_mode (GstAggregator * aggregator,
322 GstPadMode mode, gboolean active)
323 {
324 GstGLBaseMixer *mix;
325 gboolean result = FALSE;
326
327 mix = GST_GL_BASE_MIXER (aggregator);
328
329 switch (mode) {
330 case GST_PAD_MODE_PUSH:
331 case GST_PAD_MODE_PULL:
332 result = gst_gl_base_mixer_activate (mix, active);
333 break;
334 default:
335 result = TRUE;
336 break;
337 }
338 return result;
339 }
340
341 static gboolean
gst_gl_base_mixer_src_query(GstAggregator * agg,GstQuery * query)342 gst_gl_base_mixer_src_query (GstAggregator * agg, GstQuery * query)
343 {
344 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
345
346 switch (GST_QUERY_TYPE (query)) {
347 case GST_QUERY_CONTEXT:
348 {
349 if (gst_gl_handle_context_query ((GstElement *) mix, query,
350 mix->display, mix->context, mix->priv->other_context))
351 return TRUE;
352 break;
353 }
354 default:
355 break;
356 }
357
358 return GST_AGGREGATOR_CLASS (parent_class)->src_query (agg, query);
359 }
360
361 static gboolean
gst_gl_base_mixer_decide_allocation(GstAggregator * agg,GstQuery * query)362 gst_gl_base_mixer_decide_allocation (GstAggregator * agg, GstQuery * query)
363 {
364 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
365
366 if (!_get_gl_context (mix))
367 return FALSE;
368
369 return TRUE;
370 }
371
372 static void
gst_gl_base_mixer_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)373 gst_gl_base_mixer_get_property (GObject * object,
374 guint prop_id, GValue * value, GParamSpec * pspec)
375 {
376 GstGLBaseMixer *mixer = GST_GL_BASE_MIXER (object);
377
378 switch (prop_id) {
379 case PROP_CONTEXT:
380 g_value_set_object (value, mixer->context);
381 break;
382 default:
383 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
384 break;
385 }
386 }
387
388 static void
gst_gl_base_mixer_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)389 gst_gl_base_mixer_set_property (GObject * object,
390 guint prop_id, const GValue * value, GParamSpec * pspec)
391 {
392 switch (prop_id) {
393 default:
394 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
395 break;
396 }
397 }
398
399 static gboolean
gst_gl_base_mixer_start(GstAggregator * agg)400 gst_gl_base_mixer_start (GstAggregator * agg)
401 {
402 return GST_AGGREGATOR_CLASS (parent_class)->start (agg);;
403 }
404
405 static gboolean
gst_gl_base_mixer_stop(GstAggregator * agg)406 gst_gl_base_mixer_stop (GstAggregator * agg)
407 {
408 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (agg);
409
410 if (mix->context) {
411 gst_object_unref (mix->context);
412 mix->context = NULL;
413 }
414
415 return TRUE;
416 }
417
418 static GstStateChangeReturn
gst_gl_base_mixer_change_state(GstElement * element,GstStateChange transition)419 gst_gl_base_mixer_change_state (GstElement * element, GstStateChange transition)
420 {
421 GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
422 GstGLBaseMixerClass *mix_class = GST_GL_BASE_MIXER_GET_CLASS (mix);
423 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
424
425 GST_DEBUG_OBJECT (mix, "changing state: %s => %s",
426 gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
427 gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
428
429 switch (transition) {
430 case GST_STATE_CHANGE_NULL_TO_READY:
431 if (!gst_gl_ensure_element_data (element, &mix->display,
432 &mix->priv->other_context))
433 return GST_STATE_CHANGE_FAILURE;
434
435 gst_gl_display_filter_gl_api (mix->display, mix_class->supported_gl_api);
436 break;
437 default:
438 break;
439 }
440
441 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
442 if (ret == GST_STATE_CHANGE_FAILURE)
443 return ret;
444
445 switch (transition) {
446 case GST_STATE_CHANGE_READY_TO_NULL:
447 if (mix->priv->other_context) {
448 gst_object_unref (mix->priv->other_context);
449 mix->priv->other_context = NULL;
450 }
451
452 if (mix->display) {
453 gst_object_unref (mix->display);
454 mix->display = NULL;
455 }
456 break;
457 default:
458 break;
459 }
460
461 return ret;
462 }
463