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/*
* GStreamer
* Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "gstsquare.h"
GST_DEBUG_CATEGORY_STATIC (gst_square_debug);
#define GST_CAT_DEFAULT gst_square_debug
enum
{
PROP_0,
PROP_WIDTH,
PROP_HEIGHT,
PROP_ZOOM
};
#define DEFAULT_WIDTH 0.5
#define DEFAULT_HEIGHT 0.5
#define DEFAULT_ZOOM 2.0
#define gst_square_parent_class parent_class
G_DEFINE_TYPE (GstSquare, gst_square, GST_TYPE_GEOMETRIC_TRANSFORM);
/* GObject vmethod implementations */
static void
gst_square_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSquare *square;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
square = GST_SQUARE_CAST (gt);
GST_OBJECT_LOCK (square);
switch (prop_id) {
case PROP_WIDTH:
v = g_value_get_double (value);
if (v != square->width) {
square->width = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_HEIGHT:
v = g_value_get_double (value);
if (v != square->height) {
square->height = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_ZOOM:
v = g_value_get_double (value);
if (v != square->zoom) {
square->zoom = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (square);
}
static void
gst_square_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSquare *square;
GstGeometricTransform *gt;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
square = GST_SQUARE_CAST (gt);
switch (prop_id) {
case PROP_WIDTH:
g_value_set_double (value, square->width);
break;
case PROP_HEIGHT:
g_value_set_double (value, square->height);
break;
case PROP_ZOOM:
g_value_set_double (value, square->zoom);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
square_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstSquare *square = GST_SQUARE_CAST (gt);
gdouble norm_x;
gdouble norm_y;
/* frame size */
gdouble width = gt->width;
gdouble height = gt->height;
/* normalize in ((-1.0, -1.0), (1.0, 1.0) */
norm_x = 2.0 * x / width - 1.0;
norm_y = 2.0 * y / height - 1.0;
/* transform */
/* zoom at the center, smoothstep around half quadrant and get back to normal */
norm_x *=
(1.0 / square->zoom) * (1.0 + (square->zoom -
1.0) * smoothstep (square->width - 0.125, square->width + 0.125,
ABS (norm_x)));
norm_y *=
(1.0 / square->zoom) * (1.0 + (square->zoom -
1.0) * smoothstep (square->height - 0.125, square->height + 0.125,
ABS (norm_y)));
/* unnormalize */
*in_x = 0.5 * (norm_x + 1.0) * width;
*in_y = 0.5 * (norm_y + 1.0) * height;
GST_DEBUG_OBJECT (square, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}
static void
gst_square_class_init (GstSquareClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstGeometricTransformClass *gstgt_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstgt_class = (GstGeometricTransformClass *) klass;
gst_element_class_set_static_metadata (gstelement_class,
"square",
"Transform/Effect/Video",
"Distort center part of the image into a square",
"Filippo Argiolas <filippo.argiolas@gmail.com>");
gobject_class->set_property = gst_square_set_property;
gobject_class->get_property = gst_square_get_property;
g_object_class_install_property (gobject_class, PROP_WIDTH,
g_param_spec_double ("width", "Width",
"Width of the square, relative to the frame width",
0.0, 1.0, DEFAULT_WIDTH,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HEIGHT,
g_param_spec_double ("height", "Height",
"Height of the square, relative to the frame height",
0.0, 1.0, DEFAULT_HEIGHT,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ZOOM,
g_param_spec_double ("zoom", "Zoom",
"Zoom amount in the center region",
1.0, 100.0, DEFAULT_ZOOM,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = square_map;
}
static void
gst_square_init (GstSquare * filter)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
filter->width = DEFAULT_WIDTH;
filter->height = DEFAULT_HEIGHT;
filter->zoom = DEFAULT_ZOOM;
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
}
gboolean
gst_square_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_square_debug, "square", 0, "square");
return gst_element_register (plugin, "square", GST_RANK_NONE,
GST_TYPE_SQUARE);
}
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