gstreamer/ges/ges-image-source.c
Thibault Saunier 7b3ac927dc ges: Add a method to retrieve the 'natural' size of VideoSource
This way the user can easily know how the clip would look like
if no scaling was applied to the clip, this is useful to be able
to properly position the clips with the framepositionner element.
2020-02-26 13:36:30 -03:00

197 lines
5.4 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:gesimagesource
* @title: GESImageSource
* @short_description: outputs the video stream from a media file as a still
* image.
*
* Outputs the video stream from a given file as a still frame. The frame
* chosen will be determined by the in-point property on the track element. For
* image files, do not set the in-point property.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ges-internal.h"
#include "ges-track-element.h"
#include "ges-image-source.h"
struct _GESImageSourcePrivate
{
/* Dummy variable */
void *nothing;
};
enum
{
PROP_0,
PROP_URI
};
G_DEFINE_TYPE_WITH_PRIVATE (GESImageSource, ges_image_source,
GES_TYPE_VIDEO_SOURCE);
static void
ges_image_source_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESImageSource *uriclip = GES_IMAGE_SOURCE (object);
switch (property_id) {
case PROP_URI:
g_value_set_string (value, uriclip->uri);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_image_source_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESImageSource *uriclip = GES_IMAGE_SOURCE (object);
switch (property_id) {
case PROP_URI:
uriclip->uri = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_image_source_dispose (GObject * object)
{
GESImageSource *uriclip = GES_IMAGE_SOURCE (object);
if (uriclip->uri)
g_free (uriclip->uri);
G_OBJECT_CLASS (ges_image_source_parent_class)->dispose (object);
}
static void
pad_added_cb (GstElement * timeline, GstPad * pad, GstElement * scale)
{
GstPad *sinkpad;
GstPadLinkReturn ret;
sinkpad = gst_element_get_static_pad (scale, "sink");
if (sinkpad) {
GST_DEBUG ("got sink pad, trying to link");
ret = gst_pad_link (pad, sinkpad);
gst_object_unref (sinkpad);
if (GST_PAD_LINK_SUCCESSFUL (ret)) {
GST_DEBUG ("linked ok, returning");
return;
}
}
GST_DEBUG ("pad failed to link properly");
}
static GstElement *
ges_image_source_create_source (GESTrackElement * track_element)
{
GstElement *bin, *source, *scale, *freeze, *iconv;
GstPad *src, *target;
bin = GST_ELEMENT (gst_bin_new ("still-image-bin"));
source = gst_element_factory_make ("uridecodebin", NULL);
scale = gst_element_factory_make ("videoscale", NULL);
freeze = gst_element_factory_make ("imagefreeze", NULL);
iconv = gst_element_factory_make ("videoconvert", NULL);
g_object_set (scale, "add-borders", TRUE, NULL);
gst_bin_add_many (GST_BIN (bin), source, scale, freeze, iconv, NULL);
gst_element_link_pads_full (scale, "src", iconv, "sink",
GST_PAD_LINK_CHECK_NOTHING);
gst_element_link_pads_full (iconv, "src", freeze, "sink",
GST_PAD_LINK_CHECK_NOTHING);
/* FIXME: add capsfilter here with sink caps (see 626518) */
target = gst_element_get_static_pad (freeze, "src");
src = gst_ghost_pad_new ("src", target);
gst_element_add_pad (bin, src);
gst_object_unref (target);
g_object_set (source, "uri", ((GESImageSource *) track_element)->uri, NULL);
g_signal_connect (G_OBJECT (source), "pad-added",
G_CALLBACK (pad_added_cb), scale);
return bin;
}
static void
ges_image_source_class_init (GESImageSourceClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESVideoSourceClass *source_class = GES_VIDEO_SOURCE_CLASS (klass);
object_class->get_property = ges_image_source_get_property;
object_class->set_property = ges_image_source_set_property;
object_class->dispose = ges_image_source_dispose;
/**
* GESImageSource:uri:
*
* The location of the file/resource to use.
*/
g_object_class_install_property (object_class, PROP_URI,
g_param_spec_string ("uri", "URI", "uri of the resource",
NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
GES_TIMELINE_ELEMENT_CLASS (klass)->set_inpoint = NULL;
source_class->create_source = ges_image_source_create_source;
source_class->ABI.abi.get_natural_size =
ges_video_uri_source_get_natural_size;
}
static void
ges_image_source_init (GESImageSource * self)
{
self->priv = ges_image_source_get_instance_private (self);
}
/**
* ges_image_source_new:
* @uri: the URI the source should control
*
* Creates a new #GESImageSource for the provided @uri.
*
* Returns: (transfer floating): A new #GESImageSource.
*/
GESImageSource *
ges_image_source_new (gchar * uri)
{
return g_object_new (GES_TYPE_IMAGE_SOURCE, "uri", uri, "track-type",
GES_TRACK_TYPE_VIDEO, NULL);
}