gstreamer/gst/geometrictransform/gstdiffuse.c

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/*
* GStreamer
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
*
* 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.
*/
/*
* Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
* image editor and filters. The algorithms here were extracted from
* his code.
*/
/**
* SECTION:element-diffuse
* @title: diffuse
* @see_also: geometrictransform
*
* Diffuse is a geometric image transform element. It diffuses the image by
* moving its pixels in random directions.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc ! diffuse ! videoconvert ! autovideosink
* ]|
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "gstdiffuse.h"
GST_DEBUG_CATEGORY_STATIC (gst_diffuse_debug);
#define GST_CAT_DEFAULT gst_diffuse_debug
enum
{
PROP_0,
PROP_SCALE
};
#define DEFAULT_SCALE 4
#define gst_diffuse_parent_class parent_class
G_DEFINE_TYPE (GstDiffuse, gst_diffuse, GST_TYPE_GEOMETRIC_TRANSFORM);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (diffuse, "diffuse", GST_RANK_NONE,
GST_TYPE_DIFFUSE, GST_DEBUG_CATEGORY_INIT (gst_diffuse_debug, "diffuse", 0,
"diffuse"));
static void
gst_diffuse_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstDiffuse *diffuse;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
diffuse = GST_DIFFUSE_CAST (object);
GST_OBJECT_LOCK (diffuse);
switch (prop_id) {
case PROP_SCALE:
v = g_value_get_double (value);
if (v != diffuse->scale) {
diffuse->scale = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (diffuse);
}
static void
gst_diffuse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDiffuse *diffuse;
diffuse = GST_DIFFUSE_CAST (object);
switch (prop_id) {
case PROP_SCALE:
g_value_set_double (value, diffuse->scale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* Clean up */
static void
gst_diffuse_finalize (GObject * obj)
{
GstDiffuse *diffuse = GST_DIFFUSE_CAST (obj);
g_free (diffuse->sin_table);
g_free (diffuse->cos_table);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
/* GObject vmethod implementations */
static gboolean
diffuse_prepare (GstGeometricTransform * trans)
{
GstDiffuse *diffuse = GST_DIFFUSE_CAST (trans);
gint i;
if (diffuse->sin_table)
return TRUE;
diffuse->sin_table = g_malloc0 (sizeof (gdouble) * 256);
diffuse->cos_table = g_malloc0 (sizeof (gdouble) * 256);
for (i = 0; i < 256; i++) {
gdouble angle = (G_PI * 2 * i) / 256.0;
diffuse->sin_table[i] = diffuse->scale * sin (angle);
diffuse->cos_table[i] = diffuse->scale * cos (angle);
}
return TRUE;
}
static gboolean
diffuse_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstDiffuse *diffuse = GST_DIFFUSE_CAST (gt);
gint angle;
gdouble distance;
angle = g_random_int_range (0, 256);
distance = g_random_double ();
*in_x = x + distance * diffuse->sin_table[angle];
*in_y = y + distance * diffuse->cos_table[angle];
GST_DEBUG_OBJECT (diffuse, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}
static void
gst_diffuse_class_init (GstDiffuseClass * 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,
"diffuse",
"Transform/Effect/Video",
"Diffuses the image by moving its pixels in random directions",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
gobject_class->finalize = gst_diffuse_finalize;
gobject_class->set_property = gst_diffuse_set_property;
gobject_class->get_property = gst_diffuse_get_property;
g_object_class_install_property (gobject_class, PROP_SCALE,
g_param_spec_double ("scale", "scale",
"Scale of the texture",
1, G_MAXDOUBLE, DEFAULT_SCALE,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->prepare_func = diffuse_prepare;
gstgt_class->map_func = diffuse_map;
}
static void
gst_diffuse_init (GstDiffuse * filter)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
gt->precalc_map = FALSE;
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
filter->scale = DEFAULT_SCALE;
}