/* * GStreamer * Copyright (C) 2010 Filippo Argiolas * * 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. */ /** * SECTION:element-square * @see_also: geometrictransform * * The square element distorts the center part of the image into a square. * * * Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! square zoom=100 ! videoconvert ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include "gstsquare.h" GST_DEBUG_CATEGORY_STATIC (gst_square_debug); #define GST_CAT_DEFAULT gst_square_debug enum { PROP_0, PROP_WIDTH, PROP_HEIGHT, PROP_ZOOM }; #define DEFAULT_WIDTH 0.5 #define DEFAULT_HEIGHT 0.5 #define DEFAULT_ZOOM 2.0 #define gst_square_parent_class parent_class G_DEFINE_TYPE (GstSquare, gst_square, GST_TYPE_GEOMETRIC_TRANSFORM); /* GObject vmethod implementations */ static void gst_square_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSquare *square; GstGeometricTransform *gt; gdouble v; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); square = GST_SQUARE_CAST (gt); GST_OBJECT_LOCK (square); switch (prop_id) { case PROP_WIDTH: v = g_value_get_double (value); if (v != square->width) { square->width = v; gst_geometric_transform_set_need_remap (gt); } break; case PROP_HEIGHT: v = g_value_get_double (value); if (v != square->height) { square->height = v; gst_geometric_transform_set_need_remap (gt); } break; case PROP_ZOOM: v = g_value_get_double (value); if (v != square->zoom) { square->zoom = v; gst_geometric_transform_set_need_remap (gt); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (square); } static void gst_square_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstSquare *square; GstGeometricTransform *gt; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); square = GST_SQUARE_CAST (gt); switch (prop_id) { case PROP_WIDTH: g_value_set_double (value, square->width); break; case PROP_HEIGHT: g_value_set_double (value, square->height); break; case PROP_ZOOM: g_value_set_double (value, square->zoom); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean square_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstSquare *square = GST_SQUARE_CAST (gt); gdouble norm_x; gdouble norm_y; /* frame size */ gdouble width = gt->width; gdouble height = gt->height; /* normalize in ((-1.0, -1.0), (1.0, 1.0) */ norm_x = 2.0 * x / width - 1.0; norm_y = 2.0 * y / height - 1.0; /* transform */ /* zoom at the center, smoothstep around half quadrant and get back to normal */ norm_x *= (1.0 / square->zoom) * (1.0 + (square->zoom - 1.0) * gst_gm_smoothstep (square->width - 0.125, square->width + 0.125, ABS (norm_x))); norm_y *= (1.0 / square->zoom) * (1.0 + (square->zoom - 1.0) * gst_gm_smoothstep (square->height - 0.125, square->height + 0.125, ABS (norm_y))); /* unnormalize */ *in_x = 0.5 * (norm_x + 1.0) * width; *in_y = 0.5 * (norm_y + 1.0) * height; GST_DEBUG_OBJECT (square, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_square_class_init (GstSquareClass * 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, "square", "Transform/Effect/Video", "Distort center part of the image into a square", "Filippo Argiolas "); gobject_class->set_property = gst_square_set_property; gobject_class->get_property = gst_square_get_property; g_object_class_install_property (gobject_class, PROP_WIDTH, g_param_spec_double ("width", "Width", "Width of the square, relative to the frame width", 0.0, 1.0, DEFAULT_WIDTH, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_HEIGHT, g_param_spec_double ("height", "Height", "Height of the square, relative to the frame height", 0.0, 1.0, DEFAULT_HEIGHT, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ZOOM, g_param_spec_double ("zoom", "Zoom", "Zoom amount in the center region", 1.0, 100.0, DEFAULT_ZOOM, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = square_map; } static void gst_square_init (GstSquare * filter) { GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); filter->width = DEFAULT_WIDTH; filter->height = DEFAULT_HEIGHT; filter->zoom = DEFAULT_ZOOM; gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; } gboolean gst_square_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_square_debug, "square", 0, "square"); return gst_element_register (plugin, "square", GST_RANK_NONE, GST_TYPE_SQUARE); }