--- /dev/null
+/*
+ * GStreamer
+ * Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <gst/gst.h>
+#include <math.h>
+
+#include "gstfisheye.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_fisheye_debug);
+#define GST_CAT_DEFAULT gst_fisheye_debug
+
+GST_BOILERPLATE (GstFisheye, gst_fisheye, GstGeometricTransform,
+ GST_TYPE_GEOMETRIC_TRANSFORM);
+
+/* GObject vmethod implementations */
+
+static void
+gst_fisheye_base_init (gpointer gclass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+ gst_element_class_set_details_simple (element_class,
+ "fisheye",
+ "Transform/Effect/Video",
+ "Split the image into two halves and reflect one over each other",
+ "Filippo Argiolas <filippo.argiolas@gmail.com");
+}
+
+static gboolean
+fisheye_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
+ gdouble * in_y)
+{
+ GstFisheye *fisheye = GST_FISHEYE_CAST (gt);
+ gdouble norm_x;
+ gdouble norm_y;
+ gdouble r;
+
+ 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;
+
+ /* normalize radius to 1, simplifies following formula */
+ r = sqrt ((norm_x * norm_x + norm_y * norm_y) / 2.0);
+
+ /* the idea is roughly to map r to tan(r) */
+ /* to avoid switching back and forth to polar coordinates use
+ tangent expansion */
+ /* r = a*r + br^3 + cr^5 + dr^7 + o(8)) */
+ /* = r(a + br^2 + cr^4 + dr^6) */
+ /* so we can just multiply both x and y by the quantity in parenthesis */
+ /* forgetting about the tangent thing and simplifying things a
+ little bit we have a first linear term that, inverted, gives
+ the zoom amount in the center region (3x here), than a high
+ power term that makes the function blow up at the edges and a
+ quadratic term smooths the middle region */
+ /* coefficients must sum up to 1 to keep vertices in the +-1
+ square */
+ /* obviously this is a poor and arbitrary implementation of a
+ fisheye filter, if you have a more rigorous method or one
+ that gives better results please step up */
+ norm_x *= (0.33 + 0.1 * r * r + 0.57 * pow (r, 6.0));
+ norm_y *= (0.33 + 0.1 * r * r + 0.57 * pow (r, 6.0));
+
+ /* unnormalize */
+ *in_x = 0.5 * (norm_x + 1.0) * width;
+ *in_y = 0.5 * (norm_y + 1.0) * height;
+
+ GST_DEBUG_OBJECT (fisheye, "Inversely mapped %d %d into %lf %lf",
+ x, y, *in_x, *in_y);
+
+ return TRUE;
+}
+
+static void
+gst_fisheye_class_init (GstFisheyeClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstGeometricTransformClass *gstgt_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstgt_class = (GstGeometricTransformClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gstgt_class->map_func = fisheye_map;
+}
+
+static void
+gst_fisheye_init (GstFisheye * filter, GstFisheyeClass * gclass)
+{
+ GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
+
+ gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
+}
+
+gboolean
+gst_fisheye_plugin_init (GstPlugin * plugin)
+{
+ GST_DEBUG_CATEGORY_INIT (gst_fisheye_debug, "fisheye", 0, "fisheye");
+
+ return gst_element_register (plugin, "fisheye", GST_RANK_NONE,
+ GST_TYPE_FISHEYE);
+}
--- /dev/null
+/*
+ * GStreamer
+ * Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_FISHEYE_H__
+#define __GST_FISHEYE_H__
+
+#include <gst/gst.h>
+#include "gstgeometrictransform.h"
+#include "geometricmath.h"
+
+G_BEGIN_DECLS
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_FISHEYE \
+ (gst_fisheye_get_type())
+#define GST_FISHEYE(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FISHEYE,GstFisheye))
+#define GST_FISHEYE_CAST(obj) \
+ ((GstFisheye *)(obj))
+#define GST_FISHEYE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FISHEYE,GstFisheyeClass))
+#define GST_IS_FISHEYE(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FISHEYE))
+#define GST_IS_FISHEYE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FISHEYE))
+typedef struct _GstFisheye GstFisheye;
+typedef struct _GstFisheyeClass GstFisheyeClass;
+
+struct _GstFisheye
+{
+ GstGeometricTransform element;
+};
+
+struct _GstFisheyeClass
+{
+ GstGeometricTransformClass parent_class;
+};
+
+GType gst_fisheye_get_type (void);
+
+gboolean gst_fisheye_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+#endif /* __GST_FISHEYE_H__ */
projects / platform / upstream / gstreamer.git / commitdiff