--- /dev/null
+/*
+ * GStreamer
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ * Copyright (C) 2013 Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * 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.
+ */
+
+/*
+ * Perspective matrix multiplication taken from:
+ * http://docs.oracle.com/cd/E17802_01/products/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/PerspectiveTransform.html
+ */
+
+/* FIXME: suppress warnings for deprecated API such as GValueArray
+ * with newer GLib versions (>= 2.31.0)
+ *
+ * It is just not possible to switch to GArray yet because the python API in
+ * 1.2.0 still passes iterable properties as GValueArray */
+#define GLIB_DISABLE_DEPRECATION_WARNINGS
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <gst/gst.h>
+
+#include "gstperspective.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_perspective_debug);
+#define GST_CAT_DEFAULT gst_perspective_debug
+
+enum
+{
+ PROP_0,
+ PROP_MATRIX
+};
+
+
+#define gst_perspective_parent_class parent_class
+G_DEFINE_TYPE (GstPerspective, gst_perspective, GST_TYPE_GEOMETRIC_TRANSFORM);
+
+static GValueArray *
+get_array_from_matrix (GstPerspective * self)
+{
+ GValue v = { 0, };
+ GValueArray *va;
+
+ va = g_value_array_new (1);
+
+ for (int i = 0; i < 9; i++) {
+ g_value_init (&v, G_TYPE_DOUBLE);
+ g_value_set_double (&v, self->matrix[i]);
+ g_value_array_append (va, &v);
+ g_value_unset (&v);
+ }
+
+ return va;
+}
+
+static gboolean
+set_matrix_from_array (GstPerspective * self, GValueArray * va)
+{
+ guint i;
+
+ if (!va) {
+ GST_WARNING ("Invalid parameter");
+ return FALSE;
+ }
+
+ if (va->n_values != 9) {
+ GST_WARNING ("Invalid number of elements: %d", va->n_values);
+ return FALSE;
+ }
+
+ for (i = 0; i < va->n_values; i++) {
+ GValue *v = g_value_array_get_nth (va, i);
+ self->matrix[i] = g_value_get_double (v);
+ }
+
+ return TRUE;
+}
+
+static void
+gst_perspective_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstPerspective *perspective;
+ GstGeometricTransform *gt;
+ gboolean matrix_ok;
+
+ gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
+ perspective = GST_PERSPECTIVE_CAST (object);
+
+ GST_OBJECT_LOCK (perspective);
+ switch (prop_id) {
+ case PROP_MATRIX:
+ matrix_ok =
+ set_matrix_from_array (perspective, g_value_get_boxed (value));
+ if (matrix_ok) {
+ gst_geometric_transform_set_need_remap (gt);
+ }
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+ GST_OBJECT_UNLOCK (perspective);
+}
+
+static void
+gst_perspective_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstPerspective *perspective;
+
+ perspective = GST_PERSPECTIVE_CAST (object);
+
+ switch (prop_id) {
+ case PROP_MATRIX:
+ g_value_set_boxed (value, get_array_from_matrix (perspective));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+/* Clean up */
+static void
+gst_perspective_finalize (GObject * obj)
+{
+ G_OBJECT_CLASS (parent_class)->finalize (obj);
+}
+
+static gboolean
+perspective_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
+ gdouble * in_y)
+{
+ GstPerspective *perspective = GST_PERSPECTIVE_CAST (gt);
+ gdouble *m;
+ gdouble xp, yp, w, xi, yi;
+
+ m = perspective->matrix;
+
+ /* Matrix multiplication */
+ xp = (m[0] * x + m[1] * y + m[2]);
+ yp = (m[3] * x + m[4] * y + m[5]);
+ w = (m[6] * x + m[7] * y + m[8]);
+
+ /* Perspective division */
+ xi = xp / w;
+ yi = yp / w;
+
+ /* return values to caller */
+ *in_x = xi;
+ *in_y = yi;
+
+ GST_DEBUG_OBJECT (perspective, "Inversely mapped %d %d into %lf %lf",
+ x, y, *in_x, *in_y);
+
+ return TRUE;
+}
+
+static void
+gst_perspective_class_init (GstPerspectiveClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstElementClass *gstelement_class;
+ GstGeometricTransformClass *gstgt_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstelement_class = (GstElementClass *) klass;
+ gstgt_class = (GstGeometricTransformClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gst_element_class_set_static_metadata (gstelement_class,
+ "perspective",
+ "Transform/Effect/Video",
+ "Apply a 2D perspective transform",
+ "Antonio Ospite <ospite@studenti.unina.it>");
+
+ gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_perspective_finalize);
+ gobject_class->set_property =
+ GST_DEBUG_FUNCPTR (gst_perspective_set_property);
+ gobject_class->get_property =
+ GST_DEBUG_FUNCPTR (gst_perspective_get_property);
+
+ g_object_class_install_property (gobject_class, PROP_MATRIX,
+ g_param_spec_value_array ("matrix",
+ "Matrix",
+ "Matrix of dimension 3x3 to use in the 2D transform, passed as an array of 9 elements in row-major order",
+ g_param_spec_double ("Element",
+ "Transformation matrix element",
+ "Element of the transformation matrix",
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ gstgt_class->map_func = perspective_map;
+}
+
+static void
+gst_perspective_init (GstPerspective * filter)
+{
+ /* set the Identity matrix as default */
+ filter->matrix[0] = 1;
+ filter->matrix[1] = 0;
+ filter->matrix[2] = 0;
+
+ filter->matrix[3] = 0;
+ filter->matrix[4] = 1;
+ filter->matrix[5] = 0;
+
+ filter->matrix[6] = 0;
+ filter->matrix[7] = 0;
+ filter->matrix[8] = 1;
+}
+
+gboolean
+gst_perspective_plugin_init (GstPlugin * plugin)
+{
+ GST_DEBUG_CATEGORY_INIT (gst_perspective_debug, "perspective", 0,
+ "perspective");
+
+ return gst_element_register (plugin, "perspective", GST_RANK_NONE,
+ GST_TYPE_PERSPECTIVE);
+}
--- /dev/null
+/*
+ * GStreamer
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ * Copyright (C) 2013 Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * 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.
+ */
+
+#ifndef __GST_PERSPECTIVE_H__
+#define __GST_PERSPECTIVE_H__
+
+#include <gst/gst.h>
+#include "gstgeometrictransform.h"
+
+G_BEGIN_DECLS
+
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_PERSPECTIVE \
+ (gst_perspective_get_type())
+#define GST_PERSPECTIVE(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PERSPECTIVE,GstPerspective))
+#define GST_PERSPECTIVE_CAST(obj) \
+ ((GstPerspective *)(obj))
+#define GST_PERSPECTIVE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PERSPECTIVE,GstPerspectiveClass))
+#define GST_IS_PERSPECTIVE(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PERSPECTIVE))
+#define GST_IS_PERSPECTIVE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PERSPECTIVE))
+
+typedef struct _GstPerspective GstPerspective;
+typedef struct _GstPerspectiveClass GstPerspectiveClass;
+
+struct _GstPerspective
+{
+ GstGeometricTransform element;
+
+ gdouble matrix[9];
+};
+
+struct _GstPerspectiveClass
+{
+ GstGeometricTransformClass parent_class;
+};
+
+GType gst_perspective_get_type (void);
+
+gboolean gst_perspective_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_PERSPECTIVE_H__ */
projects / platform / upstream / gstreamer.git / commitdiff