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357 lines
12 KiB
C++
357 lines
12 KiB
C++
/*
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* GStreamer
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* Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
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* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2010 Sreerenj Balachandran <bsreerenj@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-opencvtextoverlay
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*
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* opencvtextoverlay renders the text on top of the video frames
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*
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* ## Example launch line
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*
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* |[
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* gst-launch-1.0 videotestsrc ! videoconvert ! opencvtextoverlay text="Opencv Text Overlay " ! videoconvert ! xvimagesink
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* ]|
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "gsttextoverlay.h"
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GST_DEBUG_CATEGORY_STATIC (gst_opencv_text_overlay_debug);
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#define GST_CAT_DEFAULT gst_opencv_opencv_text_overlay_debug
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#define DEFAULT_PROP_TEXT "Opencv Text Overlay"
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#define DEFAULT_PROP_WIDTH 1
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#define DEFAULT_PROP_HEIGHT 1
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#define DEFAULT_PROP_XPOS 50
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#define DEFAULT_PROP_YPOS 50
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#define DEFAULT_PROP_THICKNESS 2
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#define DEFAULT_PROP_COLOR 0
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_WIDTH 1.0
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#define DEFAULT_HEIGHT 1.0
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enum
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{
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PROP_0,
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PROP_XPOS,
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PROP_YPOS,
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PROP_THICKNESS,
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PROP_COLOR_R,
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PROP_COLOR_G,
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PROP_COLOR_B,
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PROP_TEXT,
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PROP_HEIGHT,
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PROP_WIDTH
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};
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/* the capabilities of the inputs and outputs.
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*
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* describe the real formats here.
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*/
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
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);
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
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);
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G_DEFINE_TYPE (GstOpencvTextOverlay, gst_opencv_text_overlay,
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GST_TYPE_OPENCV_VIDEO_FILTER);
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static void gst_opencv_text_overlay_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_opencv_text_overlay_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_opencv_text_overlay_transform_ip (GstOpencvVideoFilter
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* filter, GstBuffer * buf, cv::Mat img);
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/* Clean up */
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static void
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gst_opencv_text_overlay_finalize (GObject * obj)
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{
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GstOpencvTextOverlay *filter = GST_OPENCV_TEXT_OVERLAY (obj);
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g_free (filter->textbuf);
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G_OBJECT_CLASS (gst_opencv_text_overlay_parent_class)->finalize (obj);
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}
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/* initialize the opencvtextoverlay's class */
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static void
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gst_opencv_text_overlay_class_init (GstOpencvTextOverlayClass * klass)
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{
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GObjectClass *gobject_class;
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GstOpencvVideoFilterClass *gstopencvbasefilter_class;
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gobject_class = (GObjectClass *) klass;
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gobject_class->finalize =
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GST_DEBUG_FUNCPTR (gst_opencv_text_overlay_finalize);
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gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
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gstopencvbasefilter_class->cv_trans_ip_func =
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gst_opencv_text_overlay_transform_ip;
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gobject_class->set_property = gst_opencv_text_overlay_set_property;
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gobject_class->get_property = gst_opencv_text_overlay_get_property;
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g_object_class_install_property (gobject_class, PROP_TEXT,
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g_param_spec_string ("text", "text",
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"Text to be display.", DEFAULT_PROP_TEXT,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_XPOS,
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g_param_spec_int ("xpos", "horizontal position",
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"Sets the Horizontal position", 0, G_MAXINT,
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DEFAULT_PROP_XPOS,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_YPOS,
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g_param_spec_int ("ypos", "vertical position",
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"Sets the Vertical position", 0, G_MAXINT,
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DEFAULT_PROP_YPOS,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_THICKNESS,
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g_param_spec_int ("thickness", "font thickness",
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"Sets the Thickness of Font", 0, G_MAXINT,
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DEFAULT_PROP_THICKNESS,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_COLOR_R,
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g_param_spec_int ("colorR", "color -Red ",
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"Sets the color -R", 0, 255,
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DEFAULT_PROP_COLOR,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_COLOR_G,
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g_param_spec_int ("colorG", "color -Green",
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"Sets the color -G", 0, 255,
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DEFAULT_PROP_COLOR,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_COLOR_B,
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g_param_spec_int ("colorB", "color -Blue",
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"Sets the color -B", 0, 255,
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DEFAULT_PROP_COLOR,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_HEIGHT,
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g_param_spec_double ("height", "Height",
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"Sets the height of fonts", 1.0, 5.0,
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DEFAULT_HEIGHT,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_WIDTH,
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g_param_spec_double ("width", "Width",
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"Sets the width of fonts", 1.0, 5.0,
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DEFAULT_WIDTH,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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gst_element_class_set_static_metadata (element_class,
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"opencvtextoverlay",
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"Filter/Effect/Video",
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"Write text on the top of video", "sreerenj<bsreerenj@gmail.com>");
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gst_element_class_add_static_pad_template (element_class, &src_factory);
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gst_element_class_add_static_pad_template (element_class, &sink_factory);
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}
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/* initialize the new element
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* instantiate pads and add them to element
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* set pad callback functions
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* initialize instance structure
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*/
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static void
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gst_opencv_text_overlay_init (GstOpencvTextOverlay * filter)
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{
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filter->textbuf = g_strdup (DEFAULT_PROP_TEXT);
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filter->width = DEFAULT_PROP_WIDTH;
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filter->height = DEFAULT_PROP_HEIGHT;
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filter->xpos = DEFAULT_PROP_XPOS;
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filter->ypos = DEFAULT_PROP_YPOS;
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filter->thickness = DEFAULT_PROP_THICKNESS;
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filter->colorR = DEFAULT_PROP_COLOR;
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filter->colorG = DEFAULT_PROP_COLOR;
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filter->colorB = DEFAULT_PROP_COLOR;
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gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
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TRUE);
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}
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static void
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gst_opencv_text_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstOpencvTextOverlay *filter = GST_OPENCV_TEXT_OVERLAY (object);
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switch (prop_id) {
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case PROP_TEXT:
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g_free (filter->textbuf);
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filter->textbuf = g_value_dup_string (value);
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break;
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case PROP_XPOS:
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filter->xpos = g_value_get_int (value);
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break;
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case PROP_YPOS:
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filter->ypos = g_value_get_int (value);
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break;
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case PROP_THICKNESS:
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filter->thickness = g_value_get_int (value);
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break;
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case PROP_COLOR_R:
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filter->colorR = g_value_get_int (value);
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break;
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case PROP_COLOR_G:
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filter->colorG = g_value_get_int (value);
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break;
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case PROP_COLOR_B:
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filter->colorB = g_value_get_int (value);
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break;
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case PROP_HEIGHT:
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filter->height = g_value_get_double (value);
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break;
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case PROP_WIDTH:
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filter->width = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_opencv_text_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstOpencvTextOverlay *filter = GST_OPENCV_TEXT_OVERLAY (object);
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switch (prop_id) {
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case PROP_TEXT:
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g_value_set_string (value, filter->textbuf);
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break;
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case PROP_XPOS:
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g_value_set_int (value, filter->xpos);
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break;
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case PROP_YPOS:
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g_value_set_int (value, filter->ypos);
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break;
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case PROP_THICKNESS:
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g_value_set_int (value, filter->thickness);
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break;
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case PROP_COLOR_R:
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g_value_set_int (value, filter->colorR);
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break;
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case PROP_COLOR_G:
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g_value_set_int (value, filter->colorG);
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break;
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case PROP_COLOR_B:
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g_value_set_int (value, filter->colorB);
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break;
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case PROP_HEIGHT:
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g_value_set_double (value, filter->height);
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break;
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case PROP_WIDTH:
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g_value_set_double (value, filter->width);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* chain function
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* this function does the actual processing
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*/
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static GstFlowReturn
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gst_opencv_text_overlay_transform_ip (GstOpencvVideoFilter * base,
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GstBuffer * buf, cv::Mat img)
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{
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GstOpencvTextOverlay *filter = GST_OPENCV_TEXT_OVERLAY (base);
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cv::putText (img, filter->textbuf, cv::Point (filter->xpos,
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filter->ypos), cv::FONT_HERSHEY_SIMPLEX,
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(filter->width + filter->height) * 0.5, cv::Scalar (filter->colorR,
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filter->colorG, filter->colorB), filter->thickness);
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return GST_FLOW_OK;
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}
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/* entry point to initialize the plug-in
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* initialize the plug-in itself
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* register the element factories and other features
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*/
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gboolean
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gst_opencv_text_overlay_plugin_init (GstPlugin * plugin)
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{
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/* debug category for fltering log messages
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*
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* exchange the string 'Template opencvtextoverlay' with your description
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*/
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GST_DEBUG_CATEGORY_INIT (gst_opencv_text_overlay_debug, "opencvtextoverlay",
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0, "Template opencvtextoverlay");
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return gst_element_register (plugin, "opencvtextoverlay", GST_RANK_NONE,
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GST_TYPE_OPENCV_TEXT_OVERLAY);
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}
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