1 /* GStreamer
2 * Copyright (C) 2016 Alessandro Decina <alessandro.d@gmail.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #include "glcontexthelper.h"
21
22 static GstGLContext *
_find_local_gl_context(GstGLContextHelper * ctxh)23 _find_local_gl_context (GstGLContextHelper * ctxh)
24 {
25 GstGLContext *gl_context = NULL;
26
27 gst_gl_query_local_gl_context (GST_ELEMENT (ctxh->element), GST_PAD_SRC,
28 &gl_context);
29
30 return gl_context;
31 }
32
33 GstGLContextHelper *
gst_gl_context_helper_new(GstElement * element)34 gst_gl_context_helper_new (GstElement * element)
35 {
36 GstGLContextHelper *ctxh = g_new0 (GstGLContextHelper, 1);
37 ctxh->element = gst_object_ref (element);
38
39 return ctxh;
40 }
41
42 void
gst_gl_context_helper_free(GstGLContextHelper * ctxh)43 gst_gl_context_helper_free (GstGLContextHelper * ctxh)
44 {
45 g_return_if_fail (ctxh != NULL);
46
47 gst_object_unref (ctxh->element);
48
49 if (ctxh->display)
50 gst_object_unref (ctxh->display);
51
52 if (ctxh->context)
53 gst_object_unref (ctxh->context);
54
55 if (ctxh->other_context)
56 gst_object_unref (ctxh->other_context);
57
58 g_free (ctxh);
59 }
60
61 void
gst_gl_context_helper_ensure_context(GstGLContextHelper * ctxh)62 gst_gl_context_helper_ensure_context (GstGLContextHelper * ctxh)
63 {
64 GError *error = NULL;
65 GstGLContext *context;
66
67 g_return_if_fail (ctxh != NULL);
68
69 if (!ctxh->display)
70 gst_gl_ensure_element_data (ctxh->element, &ctxh->display,
71 &ctxh->other_context);
72
73 if (!ctxh->display)
74 goto display_error;
75
76 context = _find_local_gl_context (ctxh);
77 if (context) {
78 GST_INFO_OBJECT (ctxh->element, "found local context %p, old context %p",
79 context, ctxh->context);
80 if (ctxh->context)
81 gst_object_unref (ctxh->context);
82 ctxh->context = context;
83 }
84
85 if (!ctxh->context) {
86 GST_OBJECT_LOCK (ctxh->display);
87 do {
88 if (ctxh->context)
89 gst_object_unref (ctxh->context);
90 ctxh->context =
91 gst_gl_display_get_gl_context_for_thread (ctxh->display, NULL);
92 if (!ctxh->context) {
93 if (!gst_gl_display_create_context (ctxh->display,
94 ctxh->other_context, &ctxh->context, &error)) {
95 GST_OBJECT_UNLOCK (ctxh->display);
96 goto context_error;
97 }
98 }
99 } while (!gst_gl_display_add_context (ctxh->display, ctxh->context));
100 GST_OBJECT_UNLOCK (ctxh->display);
101 }
102
103 return;
104
105 context_error:
106 {
107 GST_ELEMENT_ERROR (ctxh->element, RESOURCE, NOT_FOUND, ("%s",
108 error->message), (NULL));
109 g_clear_error (&error);
110
111 return;
112 }
113
114 display_error:
115 {
116 GST_ELEMENT_ERROR (ctxh->element, RESOURCE, NOT_FOUND,
117 ("Failed to obtain display"), (NULL));
118
119 return;
120 }
121 }
122