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231 lines
6.6 KiB
C
231 lines
6.6 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
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* image editor and filters. The algorithms here were extracted from
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* his code.
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*/
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/**
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* SECTION:element-diffuse
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* @title: diffuse
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* @see_also: geometrictransform
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*
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* Diffuse is a geometric image transform element. It diffuses the image by
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* moving its pixels in random directions.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! diffuse ! videoconvert ! autovideosink
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* ]|
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*
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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 "gstdiffuse.h"
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GST_DEBUG_CATEGORY_STATIC (gst_diffuse_debug);
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#define GST_CAT_DEFAULT gst_diffuse_debug
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enum
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{
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PROP_0,
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PROP_SCALE
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};
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#define DEFAULT_SCALE 4
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#define gst_diffuse_parent_class parent_class
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G_DEFINE_TYPE (GstDiffuse, gst_diffuse, GST_TYPE_GEOMETRIC_TRANSFORM);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (diffuse, "diffuse", GST_RANK_NONE,
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GST_TYPE_DIFFUSE, GST_DEBUG_CATEGORY_INIT (gst_diffuse_debug, "diffuse", 0,
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"diffuse"));
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static void
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gst_diffuse_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstDiffuse *diffuse;
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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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diffuse = GST_DIFFUSE_CAST (object);
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GST_OBJECT_LOCK (diffuse);
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switch (prop_id) {
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case PROP_SCALE:
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v = g_value_get_double (value);
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if (v != diffuse->scale) {
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diffuse->scale = 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 (diffuse);
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}
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static void
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gst_diffuse_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstDiffuse *diffuse;
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diffuse = GST_DIFFUSE_CAST (object);
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switch (prop_id) {
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case PROP_SCALE:
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g_value_set_double (value, diffuse->scale);
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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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/* Clean up */
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static void
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gst_diffuse_finalize (GObject * obj)
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{
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GstDiffuse *diffuse = GST_DIFFUSE_CAST (obj);
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g_free (diffuse->sin_table);
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g_free (diffuse->cos_table);
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G_OBJECT_CLASS (parent_class)->finalize (obj);
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}
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/* GObject vmethod implementations */
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static gboolean
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diffuse_prepare (GstGeometricTransform * trans)
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{
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GstDiffuse *diffuse = GST_DIFFUSE_CAST (trans);
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gint i;
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if (diffuse->sin_table)
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return TRUE;
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diffuse->sin_table = g_malloc0 (sizeof (gdouble) * 256);
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diffuse->cos_table = g_malloc0 (sizeof (gdouble) * 256);
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for (i = 0; i < 256; i++) {
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gdouble angle = (G_PI * 2 * i) / 256.0;
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diffuse->sin_table[i] = diffuse->scale * sin (angle);
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diffuse->cos_table[i] = diffuse->scale * cos (angle);
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}
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return TRUE;
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}
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static gboolean
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diffuse_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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GstDiffuse *diffuse = GST_DIFFUSE_CAST (gt);
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gint angle;
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gdouble distance;
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angle = g_random_int_range (0, 256);
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distance = g_random_double ();
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*in_x = x + distance * diffuse->sin_table[angle];
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*in_y = y + distance * diffuse->cos_table[angle];
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GST_DEBUG_OBJECT (diffuse, "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_diffuse_class_init (GstDiffuseClass * 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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gst_element_class_set_static_metadata (gstelement_class,
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"diffuse",
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"Transform/Effect/Video",
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"Diffuses the image by moving its pixels in random directions",
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"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
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gobject_class->finalize = gst_diffuse_finalize;
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gobject_class->set_property = gst_diffuse_set_property;
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gobject_class->get_property = gst_diffuse_get_property;
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g_object_class_install_property (gobject_class, PROP_SCALE,
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g_param_spec_double ("scale", "scale",
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"Scale of the texture",
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1, G_MAXDOUBLE, DEFAULT_SCALE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->prepare_func = diffuse_prepare;
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gstgt_class->map_func = diffuse_map;
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}
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static void
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gst_diffuse_init (GstDiffuse * filter)
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{
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GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
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gt->precalc_map = FALSE;
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gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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filter->scale = DEFAULT_SCALE;
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}
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