gstreamer/ges/ges-video-source.c

271 lines
8.7 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
*/
#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"
#include "ges-extractable.h"
#define parent_class ges_video_source_parent_class
static GESExtractableInterface *parent_extractable_iface = NULL;
struct _GESVideoSourcePrivate
{
GstFramePositioner *positioner;
GstElement *capsfilter;
};
static void
ges_video_source_set_asset (GESExtractable * extractable, GESAsset * asset)
{
GESVideoSource *self = GES_VIDEO_SOURCE (extractable);
parent_extractable_iface->set_asset (extractable, asset);
ges_video_source_get_natural_size (self,
&self->priv->positioner->natural_width,
&self->priv->positioner->natural_height);
}
static void
ges_extractable_interface_init (GESExtractableInterface * iface)
{
iface->set_asset = ges_video_source_set_asset;
parent_extractable_iface = g_type_interface_peek_parent (iface);
}
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GESVideoSource, ges_video_source,
GES_TYPE_SOURCE, G_ADD_PRIVATE (GESVideoSource)
G_IMPLEMENT_INTERFACE (GES_TYPE_EXTRACTABLE,
ges_extractable_interface_init));
/* 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 gboolean
ges_video_source_create_filters (GESVideoSource * self, GPtrArray * elements,
gboolean needs_converters)
{
GESTrackElement *trksrc = GES_TRACK_ELEMENT (self);
GstElement *positioner, *videoflip, *capsfilter;
const gchar *positioner_props[]
= { "alpha", "posx", "posy", "width", "height", NULL };
const gchar *videoflip_props[] = { "video-direction", NULL };
g_ptr_array_add (elements, gst_element_factory_make ("queue", NULL));
/* 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);
g_ptr_array_add (elements, positioner);
if (needs_converters)
g_ptr_array_add (elements, gst_element_factory_make ("videoconvert", 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);
g_ptr_array_add (elements, videoflip);
if (needs_converters) {
g_ptr_array_add (elements, gst_element_factory_make ("videoscale",
"track-element-videoscale"));
g_ptr_array_add (elements, gst_element_factory_make ("videoconvert",
"track-element-videoconvert"));
}
g_ptr_array_add (elements, gst_element_factory_make ("videorate",
"track-element-videorate"));
capsfilter =
gst_element_factory_make ("capsfilter", "track-element-capsfilter");
g_ptr_array_add (elements, 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);
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;
ges_video_source_get_natural_size (self,
&self->priv->positioner->natural_width,
&self->priv->positioner->natural_height);
self->priv->capsfilter = capsfilter;
return TRUE;
}
static GstElement *
ges_video_source_create_element (GESTrackElement * trksrc)
{
GstElement *topbin;
GstElement *sub_element;
GESVideoSourceClass *source_class = GES_VIDEO_SOURCE_GET_CLASS (trksrc);
GESVideoSource *self;
gboolean needs_converters = TRUE;
GPtrArray *elements;
if (!source_class->create_source)
return NULL;
sub_element = source_class->create_source (trksrc);
self = (GESVideoSource *) trksrc;
if (source_class->ABI.abi.needs_converters)
needs_converters = source_class->ABI.abi.needs_converters (self);
elements = g_ptr_array_new ();
g_assert (source_class->ABI.abi.create_filters);
if (!source_class->ABI.abi.create_filters (self, elements, needs_converters)) {
g_ptr_array_free (elements, TRUE);
return NULL;
}
topbin = ges_source_create_topbin ("videosrcbin", sub_element, elements);
g_ptr_array_free (elements, TRUE);
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;
track_element_class->ABI.abi.default_track_type = GES_TRACK_TYPE_VIDEO;
video_source_class->create_source = NULL;
video_source_class->ABI.abi.create_filters = ges_video_source_create_filters;
}
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;
}
/**
* ges_video_source_get_natural_size:
* @self: A #GESVideoSource
* @width: (out): The natural width of the underlying source
* @height: (out): The natural height of the underlying source
*
* Retrieves the natural size of the video stream. The natural size, is
* the size at which it will be displayed if no scaling is being applied.
*
* NOTE: The sources take into account the potential video rotation applied
* by the #videoflip element that is inside the source, effects applied on
* the clip which potentially also rotate the element are not taken into
* account.
*
* Returns: %TRUE if the object has a natural size, %FALSE otherwise.
*
* Since: 1.18
*/
gboolean
ges_video_source_get_natural_size (GESVideoSource * self, gint * width,
gint * height)
{
GESVideoSourceClass *klass = GES_VIDEO_SOURCE_GET_CLASS (self);
if (!klass->ABI.abi.get_natural_size)
return FALSE;
return klass->ABI.abi.get_natural_size (self, width, height);
}