gstreamer/ext/opencv/gstedgedetect.cpp

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/*
* 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-1.0 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);
}