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92d10cbb8c
This prevents the ugly hack where the text_sink pad template was only added for textoverlay but not for the subclasses. Also makes this work with the core change that made subclasses inherit the templates of their parent class.
105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2003> David Schleef <ds@schleef.org>
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* Copyright (C) <2006> Julien Moutte <julien@moutte.net>
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* Copyright (C) <2006> Zeeshan Ali <zeeshan.ali@nokia.com>
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* Copyright (C) <2006-2008> Tim-Philipp Müller <tim centricular net>
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* Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
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* Copyright (C) <2011> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-textoverlay
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* @see_also: #GstTextRender, #GstTextOverlay, #GstTimeOverlay, #GstSubParse
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*
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* This plugin renders text on top of a video stream. This can be either
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* static text or text from buffers received on the text sink pad, e.g.
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* as produced by the subparse element. If the text sink pad is not linked,
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* the text set via the "text" property will be rendered. If the text sink
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* pad is linked, text will be rendered as it is received on that pad,
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* honouring and matching the buffer timestamps of both input streams.
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*
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* The text can contain newline characters and text wrapping is enabled by
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* default.
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*
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* <refsect2>
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* <title>Example launch lines</title>
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* |[
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* gst-launch -v videotestsrc ! textoverlay text="Room A" valign=top halign=left ! xvimagesink
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* ]| Here is a simple pipeline that displays a static text in the top left
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* corner of the video picture
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* |[
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* gst-launch -v filesrc location=subtitles.srt ! subparse ! txt. videotestsrc ! timeoverlay ! textoverlay name=txt shaded-background=yes ! xvimagesink
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* ]| Here is another pipeline that displays subtitles from an .srt subtitle
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* file, centered at the bottom of the picture and with a rectangular shading
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* around the text in the background:
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* <para>
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* If you do not have such a subtitle file, create one looking like this
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* in a text editor:
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* |[
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* 1
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* 00:00:03,000 --> 00:00:05,000
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* Hello? (3-5s)
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*
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* 2
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* 00:00:08,000 --> 00:00:13,000
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* Yes, this is a subtitle. Don't
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* you like it? (8-13s)
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*
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* 3
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* 00:00:18,826 --> 00:01:02,886
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* Uh? What are you talking about?
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* I don't understand (18-62s)
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* ]|
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* </para>
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* </refsect2>
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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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static GstStaticPadTemplate text_sink_template_factory =
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GST_STATIC_PAD_TEMPLATE ("text_sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("text/x-pango-markup; text/plain")
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);
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G_DEFINE_TYPE (GstTextOverlay, gst_text_overlay, GST_TYPE_BASE_TEXT_OVERLAY);
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static void
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gst_text_overlay_class_init (GstTextOverlayClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&text_sink_template_factory));
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gst_element_class_set_details_simple (element_class, "Text overlay",
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"Filter/Editor/Video",
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"Adds text strings on top of a video buffer",
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"David Schleef <ds@schleef.org>, " "Zeeshan Ali <zeeshan.ali@nokia.com>");
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}
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static void
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gst_text_overlay_init (GstTextOverlay * overlay)
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{
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}
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