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214 lines
6.7 KiB
C
214 lines
6.7 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., 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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* SECTION:element-stretch
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* @title: stretch
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* @see_also: geometrictransform
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*
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* The stretch element stretches the image in a circle around the center point.
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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 ! stretch ! 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 "gststretch.h"
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#include "geometricmath.h"
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GST_DEBUG_CATEGORY_STATIC (gst_stretch_debug);
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#define GST_CAT_DEFAULT gst_stretch_debug
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enum
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{
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PROP_0,
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PROP_INTENSITY
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};
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#define DEFAULT_INTENSITY 0.5
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#define MAX_SHRINK_AMOUNT 3.0
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#define gst_stretch_parent_class parent_class
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G_DEFINE_TYPE (GstStretch, gst_stretch, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (stretch, "stretch", GST_RANK_NONE,
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GST_TYPE_STRETCH, GST_DEBUG_CATEGORY_INIT (gst_stretch_debug, "stretch", 0,
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"stretch"));
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static void
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gst_stretch_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstStretch *stretch;
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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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stretch = GST_STRETCH_CAST (object);
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GST_OBJECT_LOCK (gt);
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switch (prop_id) {
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case PROP_INTENSITY:
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v = g_value_get_double (value);
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if (v != stretch->intensity) {
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stretch->intensity = 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 (gt);
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}
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static void
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gst_stretch_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstStretch *stretch;
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stretch = GST_STRETCH_CAST (object);
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switch (prop_id) {
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case PROP_INTENSITY:
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g_value_set_double (value, stretch->intensity);
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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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stretch_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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GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
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GstStretch *stretch = GST_STRETCH_CAST (gt);
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gdouble norm_x, norm_y;
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gdouble r;
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gdouble width = gt->width;
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gdouble height = gt->height;
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gdouble a, b;
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/* normalize in ((-1.0, -1.0), (1.0, 1.0) and translate the center */
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norm_x = 2.0 * (x / width - cgt->x_center);
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norm_y = 2.0 * (y / height - cgt->y_center);
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/* calculate radius, normalize to 1 for future convenience */
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r = sqrt (0.5 * (norm_x * norm_x + norm_y * norm_y));
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/* actually "stretch" name is a bit misleading, what the transform
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* really does is shrink the center and gradually return to normal
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* size while r increases. The shrink thing drags pixels giving
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* stretching the image around the center */
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/* a is the current maximum shrink amount, it goes from 1.0 to
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* MAX_SHRINK_AMOUNT * intensity */
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/* smoothstep goes from 0.0 when r == 0 to b when r == radius */
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/* total shrink factor is MAX_SHRINK_AMOUNT at center and gradually
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* decreases while r goes to radius */
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a = 1.0 + (MAX_SHRINK_AMOUNT - 1.0) * stretch->intensity;
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b = a - 1.0;
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norm_x *= a - b * gst_gm_smoothstep (0.0, cgt->radius, r);
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norm_y *= a - b * gst_gm_smoothstep (0.0, cgt->radius, r);
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/* unnormalize */
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*in_x = (0.5 * norm_x + cgt->x_center) * width;
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*in_y = (0.5 * norm_y + cgt->y_center) * height;
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GST_DEBUG_OBJECT (stretch, "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_stretch_class_init (GstStretchClass * 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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"stretch",
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"Transform/Effect/Video",
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"Stretch the image in a circle around the center point",
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"Filippo Argiolas <filippo.argiolas@gmail.com>");
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gobject_class->set_property = gst_stretch_set_property;
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gobject_class->get_property = gst_stretch_get_property;
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g_object_class_install_property (gobject_class, PROP_INTENSITY,
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g_param_spec_double ("intensity", "intensity",
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"Intensity of the stretch effect",
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0.0, 1.0, DEFAULT_INTENSITY,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = stretch_map;
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}
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static void
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gst_stretch_init (GstStretch * filter)
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{
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GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
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filter->intensity = DEFAULT_INTENSITY;
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gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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}
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