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217 lines
6.4 KiB
C
217 lines
6.4 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-rotate
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* @title: rotate
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* @see_also: geometrictransform
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*
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* The rotate element transforms the image by rotating it by a specified angle.
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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 ! rotate angle=0.78 ! 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 "geometricmath.h"
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#include "gstrotate.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rotate_debug);
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#define GST_CAT_DEFAULT gst_rotate_debug
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enum
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{
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PROP_0,
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PROP_ANGLE
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};
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#define DEFAULT_ANGLE 0
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#define gst_rotate_parent_class parent_class
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G_DEFINE_TYPE (GstRotate, gst_rotate, GST_TYPE_GEOMETRIC_TRANSFORM);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rotate, "rotate", GST_RANK_NONE,
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GST_TYPE_ROTATE, GST_DEBUG_CATEGORY_INIT (gst_rotate_debug, "rotate", 0,
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"rotate"));
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static void
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gst_rotate_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstRotate *rotate;
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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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rotate = GST_ROTATE_CAST (object);
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GST_OBJECT_LOCK (rotate);
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switch (prop_id) {
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case PROP_ANGLE:
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v = g_value_get_double (value);
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if (v != rotate->angle) {
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rotate->angle = 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 (rotate);
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}
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static void
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gst_rotate_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRotate *rotate;
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rotate = GST_ROTATE_CAST (object);
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switch (prop_id) {
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case PROP_ANGLE:
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g_value_set_double (value, rotate->angle);
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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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rotate_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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GstRotate *rotate = GST_ROTATE_CAST (gt);
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gint w, h;
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gdouble cix, ciy, cox, coy; /* centers, in/out x/y */
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gdouble ai, ao, ar; /* angles, in/out/rotate (radians) */
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gdouble r; /* radius */
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gdouble xi, yi, xo, yo; /* positions in/out x/y */
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/* input and output image height and width */
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w = gt->width;
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h = gt->height;
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/* our parameters */
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ar = rotate->angle; /* angle of rotation */
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/* get in and out centers */
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cox = 0.5 * w;
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coy = 0.5 * h;
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cix = cox;
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ciy = coy;
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/* convert output image position to polar form */
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xo = x - cox;
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yo = y - coy;
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ao = atan2 (yo, xo);
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r = sqrt (xo * xo + yo * yo);
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/* perform rotation backward to get input image rotation
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* this seems wrong, but rotation from in-->out is counterclockwise */
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ai = ao + ar;
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/* back to rectangular for input image position */
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xi = r * cos (ai);
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yi = r * sin (ai);
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/* restore center offset, return values to caller */
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*in_x = xi + cix;
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*in_y = yi + ciy;
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GST_DEBUG_OBJECT (rotate, "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_rotate_class_init (GstRotateClass * 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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"rotate",
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"Transform/Effect/Video",
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"Rotates the picture by an arbitrary angle",
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"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
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gobject_class->set_property = gst_rotate_set_property;
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gobject_class->get_property = gst_rotate_get_property;
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g_object_class_install_property (gobject_class, PROP_ANGLE,
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g_param_spec_double ("angle", "angle",
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"Angle by which the picture is rotated, in radians",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = rotate_map;
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}
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static void
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gst_rotate_init (GstRotate * filter)
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{
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filter->angle = DEFAULT_ANGLE;
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}
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