/* * GStreamer * Copyright (C) 2010 Thiago Santos * * 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 work on its java * image editor and filters. The algorithms here were extracted from * his code. */ /** * SECTION:element-rotate * @title: rotate * @see_also: geometrictransform * * The rotate element transforms the image by rotating it by a specified angle. * * ## Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! rotate angle=0.78 ! videoconvert ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include "geometricmath.h" #include "gstrotate.h" GST_DEBUG_CATEGORY_STATIC (gst_rotate_debug); #define GST_CAT_DEFAULT gst_rotate_debug enum { PROP_0, PROP_ANGLE }; #define DEFAULT_ANGLE 0 #define gst_rotate_parent_class parent_class G_DEFINE_TYPE (GstRotate, gst_rotate, GST_TYPE_GEOMETRIC_TRANSFORM); static void gst_rotate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRotate *rotate; GstGeometricTransform *gt; gdouble v; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); rotate = GST_ROTATE_CAST (object); GST_OBJECT_LOCK (rotate); switch (prop_id) { case PROP_ANGLE: v = g_value_get_double (value); if (v != rotate->angle) { rotate->angle = v; gst_geometric_transform_set_need_remap (gt); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (rotate); } static void gst_rotate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRotate *rotate; rotate = GST_ROTATE_CAST (object); switch (prop_id) { case PROP_ANGLE: g_value_set_double (value, rotate->angle); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean rotate_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstRotate *rotate = GST_ROTATE_CAST (gt); gint w, h; gdouble cix, ciy, cox, coy; /* centers, in/out x/y */ gdouble ai, ao, ar; /* angles, in/out/rotate (radians) */ gdouble r; /* radius */ gdouble xi, yi, xo, yo; /* positions in/out x/y */ /* input and output image height and width */ w = gt->width; h = gt->height; /* our parameters */ ar = rotate->angle; /* angle of rotation */ /* get in and out centers */ cox = 0.5 * w; coy = 0.5 * h; cix = cox; ciy = coy; /* convert output image position to polar form */ xo = x - cox; yo = y - coy; ao = atan2 (yo, xo); r = sqrt (xo * xo + yo * yo); /* perform rotation backward to get input image rotation * this seems wrong, but rotation from in-->out is counterclockwise */ ai = ao + ar; /* back to rectangular for input image position */ xi = r * cos (ai); yi = r * sin (ai); /* restore center offset, return values to caller */ *in_x = xi + cix; *in_y = yi + ciy; GST_DEBUG_OBJECT (rotate, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_rotate_class_init (GstRotateClass * 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, "rotate", "Transform/Effect/Video", "Rotates the picture by an arbitrary angle", "Thiago Santos"); gobject_class->set_property = gst_rotate_set_property; gobject_class->get_property = gst_rotate_get_property; g_object_class_install_property (gobject_class, PROP_ANGLE, g_param_spec_double ("angle", "angle", "Angle by which the picture is rotated, in radians", -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = rotate_map; } static void gst_rotate_init (GstRotate * filter) { filter->angle = DEFAULT_ANGLE; } gboolean gst_rotate_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_rotate_debug, "rotate", 0, "rotate"); return gst_element_register (plugin, "rotate", GST_RANK_NONE, GST_TYPE_ROTATE); }