gstreamer/ges/ges-video-source.c
2019-05-13 10:30:35 -04:00

223 lines
7.8 KiB
C

/* 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:
*
* - #gdouble `alpha`: The desired alpha for the stream.
* - #gint `posx`: The desired x position for the stream.
* - #gint `posy`: The desired y position for the stream
* - #gint `width`: The desired width for that source.
* Set to 0 if size is not mandatory, will be set to width of the current track.
* - #gint `height`: The desired height for that source.
* Set to 0 if size is not mandatory, will be set to height of the current track.
* - #GstDeinterlaceModes `deinterlace-mode`: Deinterlace Mode
* - #GstDeinterlaceFields `deinterlace-fields`: Fields to use for deinterlacing
* - #GstDeinterlaceFieldLayout `deinterlace-tff`: Deinterlace top field first
* - #GstVideoOrientationMethod `video-direction`: The desired video rotation and flipping.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/pbutils/missing-plugins.h>
#include <gst/video/video.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
struct _GESVideoSourcePrivate
{
GstFramePositioner *positioner;
GstElement *capsfilter;
};
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GESVideoSource, ges_video_source,
GES_TYPE_SOURCE);
/* 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, *videoflip, *videoscale, *videorate, *capsfilter,
*videoconvert, *deinterlace;
const gchar *positioner_props[] =
{ "alpha", "posx", "posy", "width", "height", NULL };
const gchar *deinterlace_props[] = { "mode", "fields", "tff", NULL };
const gchar *videoflip_props[] = { "video-direction", 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);
/* If there's image-orientation tag, make sure the image is correctly oriented
* before we scale it. */
videoflip = gst_element_factory_make ("videoflip", "track-element-videoflip");
g_object_set (videoflip, "video-direction", GST_VIDEO_ORIENTATION_AUTO, 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);
ges_track_element_add_children_props (trksrc, videoflip, NULL, NULL,
videoflip_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, videoflip, 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, videoflip, 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);
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 = ges_video_source_get_instance_private (self);
self->priv->positioner = NULL;
self->priv->capsfilter = NULL;
}