ext/opencv/gstedgedetect.cpp - mtk-gst-plugins-bad-debian - Git at Google

 /*
  * GStreamer
  * Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
  * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
  * Copyright (C) 2008 Michael Sheldon <mike@mikeasoft.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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 /**
  * SECTION:element-edgedetect
  *
  * Performs canny edge detection on videos and images
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch-0.10 videotestsrc ! decodebin ! videoconvert ! edgedetect ! videoconvert ! xvimagesink
  * ]|
  * </refsect2>
  */

 #ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif

 #include <gst/gst.h>

 #include "gstopencvutils.h"
 #include "gstedgedetect.h"
 #include <opencv2/imgproc/imgproc_c.h>

 GST_DEBUG_CATEGORY_STATIC (gst_edge_detect_debug);
 #define GST_CAT_DEFAULT gst_edge_detect_debug

 /* Filter signals and args */
 enum
 {
   /* FILL ME */
   LAST_SIGNAL
 };

 enum
 {
   PROP_0,
   PROP_THRESHOLD1,
   PROP_THRESHOLD2,
   PROP_APERTURE,
   PROP_MASK
 };

 /* the capabilities of the inputs and outputs.
  *
  * describe the real formats here.
  */
 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
     );

 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
     );

 G_DEFINE_TYPE (GstEdgeDetect, gst_edge_detect, GST_TYPE_ELEMENT);

 static void gst_edge_detect_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_edge_detect_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);

 static gboolean gst_edge_detect_handle_sink_event (GstPad * pad,
     GstObject * parent, GstEvent * event);
 static GstFlowReturn gst_edge_detect_chain (GstPad * pad, GstObject * parent,
     GstBuffer * buf);

 /* Clean up */
 static void
 gst_edge_detect_finalize (GObject * obj)
 {
   GstEdgeDetect *filter = GST_EDGE_DETECT (obj);

   if (filter->cvImage != NULL) {
     cvReleaseImage (&filter->cvImage);
     cvReleaseImage (&filter->cvCEdge);
     cvReleaseImage (&filter->cvGray);
     cvReleaseImage (&filter->cvEdge);
   }

   G_OBJECT_CLASS (gst_edge_detect_parent_class)->finalize (obj);
 }

 /* initialize the edgedetect's class */
 static void
 gst_edge_detect_class_init (GstEdgeDetectClass * klass)
 {
   GObjectClass *gobject_class;

   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
   gobject_class = (GObjectClass *) klass;

   gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_edge_detect_finalize);
   gobject_class->set_property = gst_edge_detect_set_property;
   gobject_class->get_property = gst_edge_detect_get_property;

   g_object_class_install_property (gobject_class, PROP_MASK,
       g_param_spec_boolean ("mask", "Mask",
           "Sets whether the detected edges should be used as a mask on the original input or not",
           TRUE, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   g_object_class_install_property (gobject_class, PROP_THRESHOLD1,
       g_param_spec_int ("threshold1", "Threshold1",
           "Threshold value for canny edge detection", 0, 1000, 50,
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   g_object_class_install_property (gobject_class, PROP_THRESHOLD2,
       g_param_spec_int ("threshold2", "Threshold2",
           "Second threshold value for canny edge detection", 0, 1000, 150,
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   g_object_class_install_property (gobject_class, PROP_APERTURE,
       g_param_spec_int ("aperture", "Aperture",
           "Aperture size for Sobel operator (Must be either 3, 5 or 7", 3, 7, 3,
           (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));

   gst_element_class_set_static_metadata (element_class,
       "edgedetect",
       "Filter/Effect/Video",
       "Performs canny edge detection on videos and images.",
       "Michael Sheldon <mike@mikeasoft.com>");

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&src_factory));
   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&sink_factory));
 }

 /* initialize the new element
  * instantiate pads and add them to element
  * set pad calback functions
  * initialize instance structure
  */
 static void
 gst_edge_detect_init (GstEdgeDetect * filter)
 {
   filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
   GST_PAD_SET_PROXY_CAPS (filter->sinkpad);
   gst_pad_set_event_function (filter->sinkpad,
       GST_DEBUG_FUNCPTR (gst_edge_detect_handle_sink_event));
   gst_pad_set_chain_function (filter->sinkpad,
       GST_DEBUG_FUNCPTR (gst_edge_detect_chain));

   filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
   GST_PAD_SET_PROXY_CAPS (filter->srcpad);

   gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
   gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
   filter->mask = TRUE;
   filter->threshold1 = 50;
   filter->threshold2 = 150;
   filter->aperture = 3;
 }

 static void
 gst_edge_detect_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstEdgeDetect *filter = GST_EDGE_DETECT (object);

   switch (prop_id) {
     case PROP_MASK:
       filter->mask = g_value_get_boolean (value);
       break;
     case PROP_THRESHOLD1:
       filter->threshold1 = g_value_get_int (value);
       break;
     case PROP_THRESHOLD2:
       filter->threshold2 = g_value_get_int (value);
       break;
     case PROP_APERTURE:
       filter->aperture = g_value_get_int (value);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_edge_detect_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstEdgeDetect *filter = GST_EDGE_DETECT (object);

   switch (prop_id) {
     case PROP_MASK:
       g_value_set_boolean (value, filter->mask);
       break;
     case PROP_THRESHOLD1:
       g_value_set_int (value, filter->threshold1);
       break;
     case PROP_THRESHOLD2:
       g_value_set_int (value, filter->threshold2);
       break;
     case PROP_APERTURE:
       g_value_set_int (value, filter->aperture);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 /* GstElement vmethod implementations */

 /* this function handles the link with other elements */
 static gboolean
 gst_edge_detect_handle_sink_event (GstPad * pad, GstObject * parent,
     GstEvent * event)
 {
   GstEdgeDetect *filter;
   gint width, height;
   GstStructure *structure;
   gboolean res = TRUE;

   filter = GST_EDGE_DETECT (parent);

   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_CAPS:
     {
       GstCaps *caps;
       gst_event_parse_caps (event, &caps);

       structure = gst_caps_get_structure (caps, 0);
       gst_structure_get_int (structure, "width", &width);
       gst_structure_get_int (structure, "height", &height);

       if (filter->cvImage != NULL) {
         cvReleaseImage (&filter->cvImage);
         cvReleaseImage (&filter->cvCEdge);
         cvReleaseImage (&filter->cvGray);
         cvReleaseImage (&filter->cvEdge);
       }

       filter->cvImage = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
       filter->cvCEdge = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
       filter->cvGray = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
       filter->cvEdge = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
       break;
     }
     default:
       break;
   }

   res = gst_pad_event_default (pad, parent, event);

   return res;

 }

 /* chain function
  * this function does the actual processing
  */
 static GstFlowReturn
 gst_edge_detect_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
 {
   GstEdgeDetect *filter;
   GstBuffer *outbuf;
   GstMapInfo in_info;
   GstMapInfo out_info;

   filter = GST_EDGE_DETECT (parent);

   buf = gst_buffer_make_writable (buf);
   gst_buffer_map (buf, &in_info, GST_MAP_WRITE);
   filter->cvImage->imageData = (char *) in_info.data;

   cvCvtColor (filter->cvImage, filter->cvGray, CV_RGB2GRAY);
   cvCanny (filter->cvGray, filter->cvEdge, filter->threshold1,
       filter->threshold2, filter->aperture);

   cvZero (filter->cvCEdge);
   if (filter->mask) {
     cvCopy (filter->cvImage, filter->cvCEdge, filter->cvEdge);
   } else {
     cvCvtColor (filter->cvEdge, filter->cvCEdge, CV_GRAY2RGB);
   }

   outbuf = gst_buffer_new_and_alloc (filter->cvCEdge->imageSize);
   gst_buffer_copy_into (outbuf, buf,
       (GstBufferCopyFlags) GST_BUFFER_COPY_METADATA, 0, -1);

   gst_buffer_map (outbuf, &out_info, GST_MAP_WRITE);
   memcpy (out_info.data, filter->cvCEdge->imageData,
       gst_buffer_get_size (outbuf));

   gst_buffer_unmap (buf, &in_info);
   gst_buffer_unmap (outbuf, &out_info);
   gst_buffer_unref (buf);
   return gst_pad_push (filter->srcpad, outbuf);
 }

 /* entry point to initialize the plug-in
  * initialize the plug-in itself
  * register the element factories and other features
  */
 gboolean
 gst_edge_detect_plugin_init (GstPlugin * plugin)
 {
   /* debug category for fltering log messages
    *
    */
   GST_DEBUG_CATEGORY_INIT (gst_edge_detect_debug, "edgedetect",
       0, "Performs canny edge detection on videos and images");

   return gst_element_register (plugin, "edgedetect", GST_RANK_NONE,
       GST_TYPE_EDGE_DETECT);
 }
	/*
	* GStreamer
	* Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
	* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
	* Copyright (C) 2008 Michael Sheldon <mike@mikeasoft.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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	/**
	* SECTION:element-edgedetect
	*
	* Performs canny edge detection on videos and images
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch-0.10 videotestsrc ! decodebin ! videoconvert ! edgedetect ! videoconvert ! xvimagesink
	* ]\|
	* </refsect2>
	*/

	#ifdef HAVE_CONFIG_H
	# include <config.h>
	#endif

	#include <gst/gst.h>

	#include "gstopencvutils.h"
	#include "gstedgedetect.h"
	#include <opencv2/imgproc/imgproc_c.h>

	GST_DEBUG_CATEGORY_STATIC (gst_edge_detect_debug);
	#define GST_CAT_DEFAULT gst_edge_detect_debug

	/* Filter signals and args */
	enum
	{
	/* FILL ME */
	LAST_SIGNAL
	};

	enum
	{
	PROP_0,
	PROP_THRESHOLD1,
	PROP_THRESHOLD2,
	PROP_APERTURE,
	PROP_MASK
	};

	/* the capabilities of the inputs and outputs.
	*
	* describe the real formats here.
	*/
	static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
	);

	static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
	);

	G_DEFINE_TYPE (GstEdgeDetect, gst_edge_detect, GST_TYPE_ELEMENT);

	static void gst_edge_detect_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);
	static void gst_edge_detect_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);

	static gboolean gst_edge_detect_handle_sink_event (GstPad * pad,
	GstObject * parent, GstEvent * event);
	static GstFlowReturn gst_edge_detect_chain (GstPad * pad, GstObject * parent,
	GstBuffer * buf);

	/* Clean up */
	static void
	gst_edge_detect_finalize (GObject * obj)
	{
	GstEdgeDetect *filter = GST_EDGE_DETECT (obj);

	if (filter->cvImage != NULL) {
	cvReleaseImage (&filter->cvImage);
	cvReleaseImage (&filter->cvCEdge);
	cvReleaseImage (&filter->cvGray);
	cvReleaseImage (&filter->cvEdge);
	}

	G_OBJECT_CLASS (gst_edge_detect_parent_class)->finalize (obj);
	}

	/* initialize the edgedetect's class */
	static void
	gst_edge_detect_class_init (GstEdgeDetectClass * klass)
	{
	GObjectClass *gobject_class;

	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
	gobject_class = (GObjectClass *) klass;

	gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_edge_detect_finalize);
	gobject_class->set_property = gst_edge_detect_set_property;
	gobject_class->get_property = gst_edge_detect_get_property;

	g_object_class_install_property (gobject_class, PROP_MASK,
	g_param_spec_boolean ("mask", "Mask",
	"Sets whether the detected edges should be used as a mask on the original input or not",
	TRUE, (GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	g_object_class_install_property (gobject_class, PROP_THRESHOLD1,
	g_param_spec_int ("threshold1", "Threshold1",
	"Threshold value for canny edge detection", 0, 1000, 50,
	(GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	g_object_class_install_property (gobject_class, PROP_THRESHOLD2,
	g_param_spec_int ("threshold2", "Threshold2",
	"Second threshold value for canny edge detection", 0, 1000, 150,
	(GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	g_object_class_install_property (gobject_class, PROP_APERTURE,
	g_param_spec_int ("aperture", "Aperture",
	"Aperture size for Sobel operator (Must be either 3, 5 or 7", 3, 7, 3,
	(GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));

	gst_element_class_set_static_metadata (element_class,
	"edgedetect",
	"Filter/Effect/Video",
	"Performs canny edge detection on videos and images.",
	"Michael Sheldon <mike@mikeasoft.com>");

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&src_factory));
	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&sink_factory));
	}

	/* initialize the new element
	* instantiate pads and add them to element
	* set pad calback functions
	* initialize instance structure
	*/
	static void
	gst_edge_detect_init (GstEdgeDetect * filter)
	{
	filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
	GST_PAD_SET_PROXY_CAPS (filter->sinkpad);
	gst_pad_set_event_function (filter->sinkpad,
	GST_DEBUG_FUNCPTR (gst_edge_detect_handle_sink_event));
	gst_pad_set_chain_function (filter->sinkpad,
	GST_DEBUG_FUNCPTR (gst_edge_detect_chain));

	filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
	GST_PAD_SET_PROXY_CAPS (filter->srcpad);

	gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
	gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
	filter->mask = TRUE;
	filter->threshold1 = 50;
	filter->threshold2 = 150;
	filter->aperture = 3;
	}

	static void
	gst_edge_detect_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstEdgeDetect *filter = GST_EDGE_DETECT (object);

	switch (prop_id) {
	case PROP_MASK:
	filter->mask = g_value_get_boolean (value);
	break;
	case PROP_THRESHOLD1:
	filter->threshold1 = g_value_get_int (value);
	break;
	case PROP_THRESHOLD2:
	filter->threshold2 = g_value_get_int (value);
	break;
	case PROP_APERTURE:
	filter->aperture = g_value_get_int (value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_edge_detect_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstEdgeDetect *filter = GST_EDGE_DETECT (object);

	switch (prop_id) {
	case PROP_MASK:
	g_value_set_boolean (value, filter->mask);
	break;
	case PROP_THRESHOLD1:
	g_value_set_int (value, filter->threshold1);
	break;
	case PROP_THRESHOLD2:
	g_value_set_int (value, filter->threshold2);
	break;
	case PROP_APERTURE:
	g_value_set_int (value, filter->aperture);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	/* GstElement vmethod implementations */

	/* this function handles the link with other elements */
	static gboolean
	gst_edge_detect_handle_sink_event (GstPad * pad, GstObject * parent,
	GstEvent * event)
	{
	GstEdgeDetect *filter;
	gint width, height;
	GstStructure *structure;
	gboolean res = TRUE;

	filter = GST_EDGE_DETECT (parent);

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_CAPS:
	{
	GstCaps *caps;
	gst_event_parse_caps (event, &caps);

	structure = gst_caps_get_structure (caps, 0);
	gst_structure_get_int (structure, "width", &width);
	gst_structure_get_int (structure, "height", &height);

	if (filter->cvImage != NULL) {
	cvReleaseImage (&filter->cvImage);
	cvReleaseImage (&filter->cvCEdge);
	cvReleaseImage (&filter->cvGray);
	cvReleaseImage (&filter->cvEdge);
	}

	filter->cvImage = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
	filter->cvCEdge = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
	filter->cvGray = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
	filter->cvEdge = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
	break;
	}
	default:
	break;
	}

	res = gst_pad_event_default (pad, parent, event);

	return res;

	}

	/* chain function
	* this function does the actual processing
	*/
	static GstFlowReturn
	gst_edge_detect_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
	{
	GstEdgeDetect *filter;
	GstBuffer *outbuf;
	GstMapInfo in_info;
	GstMapInfo out_info;

	filter = GST_EDGE_DETECT (parent);

	buf = gst_buffer_make_writable (buf);
	gst_buffer_map (buf, &in_info, GST_MAP_WRITE);
	filter->cvImage->imageData = (char *) in_info.data;

	cvCvtColor (filter->cvImage, filter->cvGray, CV_RGB2GRAY);
	cvCanny (filter->cvGray, filter->cvEdge, filter->threshold1,
	filter->threshold2, filter->aperture);

	cvZero (filter->cvCEdge);
	if (filter->mask) {
	cvCopy (filter->cvImage, filter->cvCEdge, filter->cvEdge);
	} else {
	cvCvtColor (filter->cvEdge, filter->cvCEdge, CV_GRAY2RGB);
	}

	outbuf = gst_buffer_new_and_alloc (filter->cvCEdge->imageSize);
	gst_buffer_copy_into (outbuf, buf,
	(GstBufferCopyFlags) GST_BUFFER_COPY_METADATA, 0, -1);

	gst_buffer_map (outbuf, &out_info, GST_MAP_WRITE);
	memcpy (out_info.data, filter->cvCEdge->imageData,
	gst_buffer_get_size (outbuf));

	gst_buffer_unmap (buf, &in_info);
	gst_buffer_unmap (outbuf, &out_info);
	gst_buffer_unref (buf);
	return gst_pad_push (filter->srcpad, outbuf);
	}

	/* entry point to initialize the plug-in
	* initialize the plug-in itself
	* register the element factories and other features
	*/
	gboolean
	gst_edge_detect_plugin_init (GstPlugin * plugin)
	{
	/* debug category for fltering log messages
	*
	*/
	GST_DEBUG_CATEGORY_INIT (gst_edge_detect_debug, "edgedetect",
	0, "Performs canny edge detection on videos and images");

	return gst_element_register (plugin, "edgedetect", GST_RANK_NONE,
	GST_TYPE_EDGE_DETECT);
	}