File: ges-video-source.c

package info (click to toggle)
gstreamer-editing-services1.0 1.14.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 8,388 kB
  • sloc: ansic: 43,396; sh: 4,773; perl: 1,583; makefile: 1,172; python: 581; xml: 80; lex: 44
file content (248 lines) | stat: -rw-r--r-- 9,328 bytes parent folder | download
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
/* GStreamer Editing Services
 * Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
 *               2009 Nokia Corporation
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

/**
 * SECTION:gesvideosource
 * @title: GESVideoSource
 * @short_description: Base Class for video sources
 *
 * # Children Properties:
 * You can use the following children properties through the
 * #ges_track_element_set_child_property and alike set of methods:
 *
 * <informaltable frame="none">
 * <tgroup cols="3">
 * <colspec colname="properties_type" colwidth="150px"/>
 * <colspec colname="properties_name" colwidth="200px"/>
 * <colspec colname="properties_flags" colwidth="400px"/>
 * <tbody>
 * <row>
 *  <entry role="property_type"><link linkend="gdouble"><type>double</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--alpha">alpha</link></entry>
 *  <entry>The desired alpha for the stream.</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="gint"><type>gint</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--posx">posx</link></entry>
 *  <entry>The desired x position for the stream.</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="gint"><type>gint</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--posy">posy</link></entry>
 *  <entry>The desired y position for the stream</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="gint"><type>gint</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--width">width</link></entry>
 *  <entry>The desired width for that source. Set to 0 if size is not mandatory, will be set to width of the current track.</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="gint"><type>gint</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--height">height</link></entry>
 *  <entry>The desired height for that source. Set to 0 if size is not mandatory, will be set to height of the current track.</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="GstDeinterlaceModes"><type>GstDeinterlaceModes</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--deinterlace-mode">deinterlace-mode</link></entry>
 *  <entry>Deinterlace Mode</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="GstDeinterlaceFields"><type>GstDeinterlaceFields</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--deinterlace-fields">deinterlace-fields</link></entry>
 *  <entry>Fields to use for deinterlacing</entry>
 * </row>
 * <row>
 *  <entry role="property_type"><link linkend="GstDeinterlaceFieldLayout"><type>GstDeinterlaceFieldLayout</type></link></entry>
 *  <entry role="property_name"><link linkend="GESVideoSource--deinterlace-tff">deinterlace-tff</link></entry>
 *  <entry>Deinterlace top field first</entry>
 * </row>
 * </tbody>
 * </tgroup>
 * </informaltable>
 */

#include <gst/pbutils/missing-plugins.h>

#include "ges-internal.h"
#include "ges/ges-meta-container.h"
#include "ges-track-element.h"
#include "ges-video-source.h"
#include "ges-layer.h"
#include "gstframepositioner.h"

#define parent_class ges_video_source_parent_class
G_DEFINE_ABSTRACT_TYPE (GESVideoSource, ges_video_source, GES_TYPE_SOURCE);

struct _GESVideoSourcePrivate
{
  GstFramePositioner *positioner;
  GstElement *capsfilter;
};

/* TrackElement VMethods */

static gboolean
_set_priority (GESTimelineElement * element, guint32 priority)
{
  gboolean res;
  GESVideoSource *self = GES_VIDEO_SOURCE (element);

  res = GES_TIMELINE_ELEMENT_CLASS (parent_class)->set_priority (element,
      priority);

  if (res && self->priv->positioner)
    g_object_set (self->priv->positioner, "zorder", G_MAXUINT - priority, NULL);

  return res;
}

static void
post_missing_element_message (GstElement * element, const gchar * name)
{
  GstMessage *msg;

  msg = gst_missing_element_message_new (element, name);
  gst_element_post_message (element, msg);
}

static GstElement *
ges_video_source_create_element (GESTrackElement * trksrc)
{
  GstElement *topbin;
  GstElement *sub_element;
  GstElement *queue = gst_element_factory_make ("queue", NULL);
  GESVideoSourceClass *source_class = GES_VIDEO_SOURCE_GET_CLASS (trksrc);
  GESVideoSource *self;
  GstElement *positioner, *videoscale, *videorate, *capsfilter, *videoconvert,
      *deinterlace;
  const gchar *positioner_props[] =
      { "alpha", "posx", "posy", "width", "height", NULL };
  const gchar *deinterlace_props[] = { "mode", "fields", "tff", NULL };

  if (!source_class->create_source)
    return NULL;

  sub_element = source_class->create_source (trksrc);

  self = (GESVideoSource *) trksrc;

  /* That positioner will add metadata to buffers according to its
     properties, acting like a proxy for our smart-mixer dynamic pads. */
  positioner = gst_element_factory_make ("framepositioner", "frame_tagger");
  g_object_set (positioner, "zorder",
      G_MAXUINT - GES_TIMELINE_ELEMENT_PRIORITY (self), NULL);

  videoscale =
      gst_element_factory_make ("videoscale", "track-element-videoscale");
  videoconvert =
      gst_element_factory_make ("videoconvert", "track-element-videoconvert");
  videorate = gst_element_factory_make ("videorate", "track-element-videorate");
  deinterlace = gst_element_factory_make ("deinterlace", "deinterlace");
  capsfilter =
      gst_element_factory_make ("capsfilter", "track-element-capsfilter");

  ges_frame_positioner_set_source_and_filter (GST_FRAME_POSITIONNER
      (positioner), trksrc, capsfilter);

  ges_track_element_add_children_props (trksrc, positioner, NULL, NULL,
      positioner_props);

  if (deinterlace == NULL) {
    post_missing_element_message (sub_element, "deinterlace");

    GST_ELEMENT_WARNING (sub_element, CORE, MISSING_PLUGIN,
        ("Missing element '%s' - check your GStreamer installation.",
            "deinterlace"), ("deinterlacing won't work"));
    topbin =
        ges_source_create_topbin ("videosrcbin", sub_element, queue,
        videoconvert, positioner, videoscale, videorate, capsfilter, NULL);
  } else {
    ges_track_element_add_children_props (trksrc, deinterlace, NULL, NULL,
        deinterlace_props);
    topbin =
        ges_source_create_topbin ("videosrcbin", sub_element, queue,
        videoconvert, deinterlace, positioner, videoscale, videorate,
        capsfilter, NULL);
  }

  self->priv->positioner = GST_FRAME_POSITIONNER (positioner);
  self->priv->positioner->scale_in_compositor =
      !GES_VIDEO_SOURCE_GET_CLASS (self)->ABI.abi.disable_scale_in_compositor;
  self->priv->capsfilter = capsfilter;

  return topbin;
}

static gboolean
_lookup_child (GESTimelineElement * object,
    const gchar * prop_name, GObject ** element, GParamSpec ** pspec)
{
  gboolean res;

  gchar *clean_name;

  if (!g_strcmp0 (prop_name, "deinterlace-fields"))
    clean_name = g_strdup ("GstDeinterlace::fields");
  else if (!g_strcmp0 (prop_name, "deinterlace-mode"))
    clean_name = g_strdup ("GstDeinterlace::mode");
  else if (!g_strcmp0 (prop_name, "deinterlace-tff"))
    clean_name = g_strdup ("GstDeinterlace::tff");
  else if (!g_strcmp0 (prop_name, "tff") ||
      !g_strcmp0 (prop_name, "fields") || !g_strcmp0 (prop_name, "mode")) {
    GST_DEBUG_OBJECT (object, "Not allowed to use GstDeinterlace %s"
        " property without prefixing its name", prop_name);
    return FALSE;
  } else
    clean_name = g_strdup (prop_name);

  res =
      GES_TIMELINE_ELEMENT_CLASS (ges_video_source_parent_class)->lookup_child
      (object, clean_name, element, pspec);

  g_free (clean_name);

  return res;
}

static void
ges_video_source_class_init (GESVideoSourceClass * klass)
{
  GESTrackElementClass *track_element_class = GES_TRACK_ELEMENT_CLASS (klass);
  GESTimelineElementClass *element_class = GES_TIMELINE_ELEMENT_CLASS (klass);
  GESVideoSourceClass *video_source_class = GES_VIDEO_SOURCE_CLASS (klass);

  g_type_class_add_private (klass, sizeof (GESVideoSourcePrivate));

  element_class->set_priority = _set_priority;
  element_class->lookup_child = _lookup_child;

  track_element_class->nleobject_factorytype = "nlesource";
  track_element_class->create_element = ges_video_source_create_element;
  video_source_class->create_source = NULL;
}

static void
ges_video_source_init (GESVideoSource * self)
{
  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
      GES_TYPE_VIDEO_SOURCE, GESVideoSourcePrivate);
  self->priv->positioner = NULL;
  self->priv->capsfilter = NULL;
}