/* * GStreamer * Copyright (C) 2005 Thomas Vander Stichele * Copyright (C) 2005 Ronald S. Bultje * Copyright (C) 2010 Sreerenj Balachandran * * 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. * * * Example launch line * |[ * gst-launch -v -m fakesrc ! textwrite ! fakesink silent=TRUE * ]| * */ #ifdef HAVE_CONFIG_H # include #endif #include #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"); 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); }