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236 lines
7.2 KiB
C
236 lines
7.2 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/gst.h>
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#include <math.h>
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#include "gstsquare.h"
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GST_DEBUG_CATEGORY_STATIC (gst_square_debug);
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#define GST_CAT_DEFAULT gst_square_debug
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enum
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{
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PROP_0,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_ZOOM
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};
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#define DEFAULT_WIDTH 0.5
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#define DEFAULT_HEIGHT 0.5
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#define DEFAULT_ZOOM 2.0
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#define gst_square_parent_class parent_class
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G_DEFINE_TYPE (GstSquare, gst_square, GST_TYPE_GEOMETRIC_TRANSFORM);
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/* GObject vmethod implementations */
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static void
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gst_square_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSquare *square;
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GstGeometricTransform *gt;
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gdouble v;
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gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
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square = GST_SQUARE_CAST (gt);
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GST_OBJECT_LOCK (square);
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switch (prop_id) {
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case PROP_WIDTH:
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v = g_value_get_double (value);
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if (v != square->width) {
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square->width = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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case PROP_HEIGHT:
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v = g_value_get_double (value);
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if (v != square->height) {
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square->height = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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case PROP_ZOOM:
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v = g_value_get_double (value);
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if (v != square->zoom) {
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square->zoom = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (square);
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}
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static void
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gst_square_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstSquare *square;
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GstGeometricTransform *gt;
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gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
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square = GST_SQUARE_CAST (gt);
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switch (prop_id) {
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case PROP_WIDTH:
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g_value_set_double (value, square->width);
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break;
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case PROP_HEIGHT:
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g_value_set_double (value, square->height);
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break;
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case PROP_ZOOM:
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g_value_set_double (value, square->zoom);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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square_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
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gdouble * in_y)
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{
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GstSquare *square = GST_SQUARE_CAST (gt);
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gdouble norm_x;
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gdouble norm_y;
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/* frame size */
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gdouble width = gt->width;
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gdouble height = gt->height;
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/* normalize in ((-1.0, -1.0), (1.0, 1.0) */
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norm_x = 2.0 * x / width - 1.0;
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norm_y = 2.0 * y / height - 1.0;
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/* transform */
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/* zoom at the center, smoothstep around half quadrant and get back to normal */
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norm_x *=
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(1.0 / square->zoom) * (1.0 + (square->zoom -
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1.0) * smoothstep (square->width - 0.125, square->width + 0.125,
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ABS (norm_x)));
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norm_y *=
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(1.0 / square->zoom) * (1.0 + (square->zoom -
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1.0) * smoothstep (square->height - 0.125, square->height + 0.125,
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ABS (norm_y)));
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/* unnormalize */
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*in_x = 0.5 * (norm_x + 1.0) * width;
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*in_y = 0.5 * (norm_y + 1.0) * height;
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GST_DEBUG_OBJECT (square, "Inversely mapped %d %d into %lf %lf",
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x, y, *in_x, *in_y);
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return TRUE;
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}
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static void
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gst_square_class_init (GstSquareClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstGeometricTransformClass *gstgt_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstgt_class = (GstGeometricTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gst_element_class_set_details_simple (gstelement_class,
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"square",
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"Transform/Effect/Video",
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"Distort center part of the image into a square",
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"Filippo Argiolas <filippo.argiolas@gmail.com>");
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_square_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_square_get_property);
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g_object_class_install_property (gobject_class, PROP_WIDTH,
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g_param_spec_double ("width", "Width",
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"Width of the square, relative to the frame width",
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0.0, 1.0, DEFAULT_WIDTH,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_HEIGHT,
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g_param_spec_double ("height", "Height",
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"Height of the square, relative to the frame height",
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0.0, 1.0, DEFAULT_HEIGHT,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ZOOM,
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g_param_spec_double ("zoom", "Zoom",
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"Zoom amount in the center region",
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1.0, 100.0, DEFAULT_ZOOM,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = square_map;
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}
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static void
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gst_square_init (GstSquare * filter)
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{
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GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
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filter->width = DEFAULT_WIDTH;
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filter->height = DEFAULT_HEIGHT;
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filter->zoom = DEFAULT_ZOOM;
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gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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}
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gboolean
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gst_square_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (gst_square_debug, "square", 0, "square");
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return gst_element_register (plugin, "square", GST_RANK_NONE,
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GST_TYPE_SQUARE);
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}
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