gstreamer/subprojects/gst-plugins-base/gst/videoconvertscale/gstvideoscale.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005-2012 David Schleef <ds@schleef.org>
*
* 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:element-videoscale
* @title: videoscale
* @see_also: videorate, videoconvert
*
* This element resizes video frames. By default the element will try to
* negotiate to the same size on the source and sinkpad so that no scaling
* is needed. It is therefore safe to insert this element in a pipeline to
* get more robust behaviour without any cost if no scaling is needed.
*
* This element supports a wide range of color spaces including various YUV and
* RGB formats and is therefore generally able to operate anywhere in a
* pipeline.
*
* ## Example pipelines
* |[
* gst-launch-1.0 -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoconvert ! videoscale ! autovideosink
* ]|
* Decode an Ogg/Theora and display the video. If the video sink chosen
* cannot perform scaling, the video scaling will be performed by videoscale
* when you resize the video window.
* To create the test Ogg/Theora file refer to the documentation of theoraenc.
* |[
* gst-launch-1.0 -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoconvert ! videoscale ! video/x-raw,width=100 ! autovideosink
* ]|
* Decode an Ogg/Theora and display the video with a width of 100.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define DEFAULT_PROP_GAMMA_DECODE FALSE
#include "gstvideoscale.h"
G_DEFINE_TYPE (GstVideoScale, gst_video_scale, GST_TYPE_VIDEO_CONVERT_SCALE);
GST_ELEMENT_REGISTER_DEFINE (videoscale, "videoscale",
GST_RANK_MARGINAL, gst_video_scale_get_type ());
enum
{
PROP_0,
PROP_GAMMA_DECODE
};
static void
gst_video_scale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case PROP_GAMMA_DECODE:
{
gint mode;
g_object_get (object, "gamma-mode", &mode, NULL);
g_value_set_boolean (value, mode == GST_VIDEO_GAMMA_MODE_REMAP);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_scale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case PROP_GAMMA_DECODE:
{
if (g_value_get_boolean (value))
g_object_set (object, "gamma-mode", GST_VIDEO_GAMMA_MODE_REMAP, NULL);
else
g_object_set (object, "gamma-mode", GST_VIDEO_GAMMA_MODE_NONE, NULL);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_scale_class_init (GstVideoScaleClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoConvertScaleClass *convertscale_class =
GST_VIDEO_CONVERT_SCALE_CLASS (klass);
gobject_class->set_property = gst_video_scale_set_property;
gobject_class->get_property = gst_video_scale_get_property;
g_object_class_install_property (gobject_class, PROP_GAMMA_DECODE,
g_param_spec_boolean ("gamma-decode", "Gamma Decode",
"Decode gamma before scaling", DEFAULT_PROP_GAMMA_DECODE,
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"Video scaler", "Filter/Video/Scaler",
"Resizes video", "Wim Taymans <wim.taymans@gmail.com>");
convertscale_class->converts = FALSE;
convertscale_class->scales = TRUE;
}
static void
gst_video_scale_init (GstVideoScale * self)
{
}