mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-30 21:51:09 +00:00
114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
/* GStreamer
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Copyright (C) <2003> David Schleef <ds@schleef.org>
|
|
* Copyright (C) <2006> Julien Moutte <julien@moutte.net>
|
|
* Copyright (C) <2006> Zeeshan Ali <zeeshan.ali@nokia.com>
|
|
* Copyright (C) <2006-2008> Tim-Philipp Müller <tim centricular net>
|
|
* Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
|
|
* Copyright (C) <2011> Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
*
|
|
* 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-textoverlay
|
|
* @see_also: #GstTextRender, #GstTextOverlay, #GstTimeOverlay, #GstSubParse
|
|
*
|
|
* This plugin renders text on top of a video stream. This can be either
|
|
* static text or text from buffers received on the text sink pad, e.g.
|
|
* as produced by the subparse element. If the text sink pad is not linked,
|
|
* the text set via the "text" property will be rendered. If the text sink
|
|
* pad is linked, text will be rendered as it is received on that pad,
|
|
* honouring and matching the buffer timestamps of both input streams.
|
|
*
|
|
* The text can contain newline characters and text wrapping is enabled by
|
|
* default.
|
|
*
|
|
* <refsect2>
|
|
* <title>Example launch lines</title>
|
|
* |[
|
|
* gst-launch -v videotestsrc ! textoverlay text="Room A" valign=top halign=left ! xvimagesink
|
|
* ]| Here is a simple pipeline that displays a static text in the top left
|
|
* corner of the video picture
|
|
* |[
|
|
* gst-launch -v filesrc location=subtitles.srt ! subparse ! txt. videotestsrc ! timeoverlay ! textoverlay name=txt shaded-background=yes ! xvimagesink
|
|
* ]| Here is another pipeline that displays subtitles from an .srt subtitle
|
|
* file, centered at the bottom of the picture and with a rectangular shading
|
|
* around the text in the background:
|
|
* <para>
|
|
* If you do not have such a subtitle file, create one looking like this
|
|
* in a text editor:
|
|
* |[
|
|
* 1
|
|
* 00:00:03,000 --> 00:00:05,000
|
|
* Hello? (3-5s)
|
|
*
|
|
* 2
|
|
* 00:00:08,000 --> 00:00:13,000
|
|
* Yes, this is a subtitle. Don't
|
|
* you like it? (8-13s)
|
|
*
|
|
* 3
|
|
* 00:00:18,826 --> 00:01:02,886
|
|
* Uh? What are you talking about?
|
|
* I don't understand (18-62s)
|
|
* ]|
|
|
* One can also feed arbitrary live text into the element:
|
|
* |[
|
|
* gst-launch fdsrc fd=0 ! text/plain ! txt. videotestsrc ! \
|
|
* textoverlay name=txt shaded-background=yes font-desc="Serif 40" wait-text=false ! \
|
|
* xvimagesink
|
|
* ]| This shows new text as entered on the terminal (stdin). This is not suited
|
|
* for subtitles as the test overlay is not timed. Subtitles should use
|
|
* timestamped formats. For the above use case one can also read the text from
|
|
* the application as set the #GstTextOverlay:text property.
|
|
* </para>
|
|
* </refsect2>
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <gsttextoverlay.h>
|
|
|
|
static GstStaticPadTemplate text_sink_template_factory =
|
|
GST_STATIC_PAD_TEMPLATE ("text_sink",
|
|
GST_PAD_SINK,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("text/x-pango-markup; text/plain")
|
|
);
|
|
|
|
G_DEFINE_TYPE (GstTextOverlay, gst_text_overlay, GST_TYPE_BASE_TEXT_OVERLAY);
|
|
|
|
static void
|
|
gst_text_overlay_class_init (GstTextOverlayClass * klass)
|
|
{
|
|
GstElementClass *element_class = (GstElementClass *) klass;
|
|
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&text_sink_template_factory));
|
|
|
|
gst_element_class_set_static_metadata (element_class, "Text overlay",
|
|
"Filter/Editor/Video",
|
|
"Adds text strings on top of a video buffer",
|
|
"David Schleef <ds@schleef.org>, " "Zeeshan Ali <zeeshan.ali@nokia.com>");
|
|
}
|
|
|
|
static void
|
|
gst_text_overlay_init (GstTextOverlay * overlay)
|
|
{
|
|
}
|