Add simple text overlay plugin

ext/opencv/Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = edgedetect faceblur facedetect pyramidsegment
+SUBDIRS = edgedetect faceblur facedetect pyramidsegment templatematch textwrite
 
 # plugindir is set in configure
 
@@ -14,14 +14,16 @@ libgstopencv_la_CFLAGS = $(GST_CFLAGS) $(OPENCV_CFLAGS) \
 								 -I${top_srcdir}/ext/opencv/faceblur \
 								 -I${top_srcdir}/ext/opencv/facedetect \
 								 -I${top_srcdir}/ext/opencv/pyramidsegment \
-								 -I${top_srcdir}/ext/opencv/templatematch
+								 -I${top_srcdir}/ext/opencv/templatematch \
+								 -I${top_srcdir}/ext/opencv/textwrite 
 
 libgstopencv_la_LIBADD = $(GST_LIBS) $(OPENCV_LIBS) \
 								 $(top_builddir)/ext/opencv/edgedetect/libgstedgedetect.la \
 								 $(top_builddir)/ext/opencv/faceblur/libgstfaceblur.la \
 								 $(top_builddir)/ext/opencv/facedetect/libgstfacedetect.la \
 								 $(top_builddir)/ext/opencv/pyramidsegment/libgstpyramidsegment.la \
-								 $(top_builddir)/ext/opencv/templatematch/libgsttemplatematch.la
+								 $(top_builddir)/ext/opencv/templatematch/libgsttemplatematch.la \
+								 $(top_builddir)/ext/opencv/textwrite/libgsttextwrite.la
 
 libgstopencv_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
@@ -30,7 +32,8 @@ libgstopencv_la_DEPENDENCIES = \
 								 $(top_builddir)/ext/opencv/faceblur/libgstfaceblur.la \
 								 $(top_builddir)/ext/opencv/facedetect/libgstfacedetect.la \
 								 $(top_builddir)/ext/opencv/pyramidsegment/libgstpyramidsegment.la \
-								 $(top_builddir)/ext/opencv/templatematch/libgsttemplatematch.la
+								 $(top_builddir)/ext/opencv/templatematch/libgsttemplatematch.la \
+								 $(top_builddir)/ext/opencv/textwrite/libgsttextwrite.la
 
 # headers we need but don't want installed
 noinst_HEADERS = 

ext/opencv/gstopencv.c

@@ -28,6 +28,7 @@
 #include "gstfacedetect.h"
 #include "gstpyramidsegment.h"
 #include "gsttemplatematch.h"
+#include "gsttextwrite.h"
 
 static gboolean
 plugin_init (GstPlugin * plugin)
@@ -48,6 +49,9 @@ plugin_init (GstPlugin * plugin)
   if (!gst_templatematch_plugin_init (plugin))
     return FALSE;
 
+  if (!gst_textwrite_plugin_init (plugin))
+    return FALSE;
+
   return TRUE;
 }
 

ext/opencv/textwrite/Makefile.am

@@ -0,0 +1,15 @@
+# plugindir is set in configure
+
+noinst_LTLIBRARIES = libgsttextwrite.la
+
+# sources used to compile this plug-in
+libgsttextwrite_la_SOURCES = gsttextwrite.c
+
+# flags used to compile this textwrite
+# add other _CFLAGS and _LIBS as needed
+libgsttextwrite_la_CFLAGS = $(GST_CFLAGS) $(OPENCV_CFLAGS)
+libgsttextwrite_la_LIBADD = $(GST_LIBS) $(OPENCV_LIBS)
+libgsttextwrite_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+# headers we need but don't want installed
+noinst_HEADERS = gsttextwrite.h

ext/opencv/textwrite/gsttextwrite.c

@@ -0,0 +1,329 @@
+/*
+ * GStreamer
+ * Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
+ * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (C) 2010 Sreerenj Balachandran <bsreerenj@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.
+ */
+
+/**
+ * SECTION:element-textwrite
+ *
+ * FIXME:Describe textwrite here.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch -v -m fakesrc ! textwrite ! fakesink silent=TRUE
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <gst/gst.h>
+
+#include "gsttextwrite.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_textwrite_debug);
+#define GST_CAT_DEFAULT gst_textwrite_debug
+#define DEFAULT_PROP_TEXT 	""
+#define DEFAULT_PROP_WIDTH 	1
+#define DEFAULT_PROP_HEIGHT 	1
+
+/* Filter signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+#define DEFAULT_WIDTH     1.0
+#define DEFAULT_HEIGHT    1.0
+enum
+{
+  PROP_0,
+  PROP_TEXT,
+  PROP_HEIGHT,
+  PROP_WIDTH
+};
+
+/* 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 ("video/x-raw-rgb")
+    );
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("ANY")
+    );
+
+GST_BOILERPLATE (Gsttextwrite, gst_textwrite, GstElement,GST_TYPE_ELEMENT);
+
+static void gst_textwrite_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_textwrite_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static gboolean gst_textwrite_set_caps (GstPad * pad, GstCaps * caps);
+static GstFlowReturn gst_textwrite_chain (GstPad * pad, GstBuffer * buf);
+
+
+
+/* Clean up */
+static void
+gst_textwrite_finalize (GObject * obj)
+{
+  Gsttextwrite *filter = GST_textwrite (obj);
+
+  if (filter->cvImage) {
+    cvReleaseImage (&filter->cvImage);
+  }
+
+  G_OBJECT_CLASS (parent_class)->finalize (obj);
+}
+
+
+
+/* GObject vmethod implementations */
+
+static void
+gst_textwrite_base_init (gpointer gclass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+  gst_element_class_set_details_simple(element_class,
+    "textwrite",
+    "Filter/Effect/Video",
+    "Performs text writing to the video",
+    "sreerenj<bsreerenj@gmail.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 textwrite's class */
+static void
+gst_textwrite_class_init (GsttextwriteClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_textwrite_finalize);
+
+  gobject_class->set_property = gst_textwrite_set_property;
+  gobject_class->get_property = gst_textwrite_get_property;
+
+
+ g_object_class_install_property (gobject_class, PROP_TEXT,
+      g_param_spec_string ("text", "text",
+          "Text to be display.", DEFAULT_PROP_TEXT,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_HEIGHT,
+      g_param_spec_double ("height", "Height",
+          "Sets the height of fonts",1.0,5.0,
+          DEFAULT_HEIGHT, G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_WIDTH,
+      g_param_spec_double ("width", "Width",
+          "Sets the width of fonts",1.0,5.0,
+          DEFAULT_WIDTH, G_PARAM_READWRITE| G_PARAM_STATIC_STRINGS));
+  
+}
+
+/* initialize the new element
+ * instantiate pads and add them to element
+ * set pad calback functions
+ * initialize instance structure
+ */
+static void
+gst_textwrite_init (Gsttextwrite * filter,
+    GsttextwriteClass * gclass)
+{
+  filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
+  gst_pad_set_setcaps_function (filter->sinkpad,
+                                GST_DEBUG_FUNCPTR(gst_textwrite_set_caps));
+  gst_pad_set_getcaps_function (filter->sinkpad,
+                                GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));
+  gst_pad_set_chain_function (filter->sinkpad,
+                              GST_DEBUG_FUNCPTR(gst_textwrite_chain));
+
+  filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
+  gst_pad_set_getcaps_function (filter->srcpad,
+                                GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));
+
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+  filter->textbuf = g_strdup (DEFAULT_PROP_TEXT); 
+  filter->width=DEFAULT_PROP_WIDTH;
+  filter->height=DEFAULT_PROP_HEIGHT;
+  
+}
+
+static void
+gst_textwrite_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  Gsttextwrite *filter = GST_textwrite (object);
+
+  switch (prop_id) {
+    case PROP_TEXT:
+      g_free (filter->textbuf);
+      filter->textbuf = g_value_dup_string (value);
+      break;
+    case PROP_HEIGHT:
+      filter->height = g_value_get_double(value);
+      break;
+    case PROP_WIDTH:
+      filter->width = g_value_get_double(value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_textwrite_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  Gsttextwrite *filter = GST_textwrite (object);
+
+  switch (prop_id) {
+    case PROP_TEXT:
+      g_value_set_string (value, filter->textbuf);
+      break;
+    case PROP_HEIGHT:
+      g_value_set_double (value, filter->height);
+      break;
+    case PROP_WIDTH:
+      g_value_set_double (value, filter->width);
+      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_textwrite_set_caps (GstPad * pad, GstCaps * caps)
+{
+  Gsttextwrite *filter;
+  GstPad *otherpad;
+  
+  gint width, height;
+  GstStructure *structure;
+
+  filter = GST_textwrite (gst_pad_get_parent (pad));
+  
+  structure = gst_caps_get_structure (caps, 0);
+  gst_structure_get_int (structure, "width", &width);
+  gst_structure_get_int (structure, "height", &height);
+
+  filter->cvImage = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
+  filter->cvStorage = cvCreateMemStorage (0);
+
+  otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad;
+  gst_object_unref (filter);
+
+  return gst_pad_set_caps (otherpad, caps);
+}
+
+/* chain function
+ * this function does the actual processing
+ */
+static GstFlowReturn
+gst_textwrite_chain (GstPad * pad, GstBuffer * buf)
+{
+  Gsttextwrite *filter;
+
+  filter = GST_textwrite (GST_OBJECT_PARENT (pad));
+
+  filter->cvImage->imageData = (char *) GST_BUFFER_DATA (buf);
+  int    lineWidth=1;
+  cvInitFont(&(filter->font),CV_FONT_VECTOR0, filter->width,filter->height,0,lineWidth,0);
+
+  
+  cvPutText (filter->cvImage,filter->textbuf,cvPoint(100,100), &(filter->font), cvScalar(165,14,14,0));
+
+
+  gst_buffer_set_data (buf, filter->cvImage->imageData,filter->cvImage->imageSize);
+
+ 
+  return gst_pad_push (filter->srcpad, buf);
+}
+
+
+/* entry point to initialize the plug-in
+ * initialize the plug-in itself
+ * register the element factories and other features
+ */
+gboolean
+gst_textwrite_plugin_init (GstPlugin * plugin)
+{
+  /* debug category for fltering log messages
+   *
+   * exchange the string 'Template textwrite' with your description
+   */
+  GST_DEBUG_CATEGORY_INIT (gst_textwrite_debug, "textwrite",
+      0, "Template textwrite");
+
+  return gst_element_register (plugin, "textwrite", GST_RANK_NONE,
+      GST_TYPE_textwrite);
+}
+
+

ext/opencv/textwrite/gsttextwrite.h

@@ -0,0 +1,98 @@
+/*
+ * GStreamer
+ * Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
+ * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (C) 2010 root <<user@hostname.org>>m
+ * 
+ * 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_textwrite_H__
+#define __GST_textwrite_H__
+
+#include <gst/gst.h>
+//sreechage
+#include <cv.h>
+#include <cvaux.h>
+#include <highgui.h>
+G_BEGIN_DECLS
+
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_textwrite \
+  (gst_textwrite_get_type())
+#define GST_textwrite(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_textwrite,Gsttextwrite))
+#define GST_textwrite_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_textwrite,GsttextwriteClass))
+#define GST_IS_textwrite(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_textwrite))
+#define GST_IS_textwrite_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_textwrite))
+
+typedef struct _Gsttextwrite      Gsttextwrite;
+typedef struct _GsttextwriteClass GsttextwriteClass;
+
+struct _Gsttextwrite
+{
+  GstElement element;
+
+  GstPad *sinkpad, *srcpad;
+
+ 
+  IplImage *cvImage;
+  CvMemStorage *cvStorage;
+  CvFont font;  
+
+  gdouble height;
+  gdouble width;
+  gchar *textbuf;
+
+};
+
+struct _GsttextwriteClass 
+{
+  GstElementClass parent_class;
+};
+
+GType gst_textwrite_get_type (void);
+gboolean gst_textwrite_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_textwrite_H__ */