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cairooverlay: Add generic Cairo overlay video element.

Browse source 
Allows applications to connect to the "draw" signal of
the element and do their custom drawing there.
Includes an example application demonstrating usage.

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=595520
This commit is contained in:
Jon Nordby 2011-01-28 02:14:04 +02:00 committed by Sebastian Dröge
parent 3ec3bed497
commit 32dff9df75
14 changed files with 594 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
configure.ac
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@ -715,6 +715,13 @@ AG_GST_CHECK_FEATURE(CAIRO, [Cairo graphics rendering], cairo, [
AG_GST_PKG_CHECK_MODULES(CAIRO, cairo >= 1.0.0)
])
dnl *** cairo-gobject ***
translit(dnm, m, l) AM_CONDITIONAL(USE_CAIRO_GOBJECT, true)
AG_GST_CHECK_FEATURE(CAIRO_GOBJECT,
[Cairo graphics rendering gobject bindings], cairooverlay, [
AG_GST_PKG_CHECK_MODULES(CAIRO_GOBJECT, cairo-gobject >= 1.10.0)
])
dnl **** ESound ****
translit(dnm, m, l) AM_CONDITIONAL(USE_ESD, true)
AG_GST_CHECK_FEATURE(ESD, [ESounD sound daemon], esdsink, [
@ -1021,6 +1028,7 @@ AM_CONDITIONAL(USE_AALIB, false)
AM_CONDITIONAL(USE_ANNODEX, false)
AM_CONDITIONAL(USE_BZ2, false)
AM_CONDITIONAL(USE_CAIRO, false)
AM_CONDITIONAL(USE_CAIRO_GOBJECT, false)
AM_CONDITIONAL(USE_DIRECTSOUND, false)
AM_CONDITIONAL(USE_DV1394, false)
AM_CONDITIONAL(USE_ESD, false)
@ -1191,6 +1199,7 @@ tests/Makefile
tests/check/Makefile
tests/examples/Makefile
tests/examples/audiofx/Makefile
tests/examples/cairo/Makefile
tests/examples/equalizer/Makefile
tests/examples/jack/Makefile
tests/examples/level/Makefile

1
docs/plugins/Makefile.am
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@ -81,6 +81,7 @@ EXTRA_HFILES = \
$(top_srcdir)/ext/cairo/gsttextoverlay.h \
$(top_srcdir)/ext/cairo/gsttimeoverlay.h \
$(top_srcdir)/ext/cairo/gstcairorender.h \
$(top_srcdir)/ext/cairo/gstcairooverlay.h \
$(top_srcdir)/ext/dv/gstdvdec.h \
$(top_srcdir)/ext/dv/gstdvdemux.h \
$(top_srcdir)/ext/esd/esdsink.h \

1
docs/plugins/gst-plugins-good-plugins-docs.sgml
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@ -51,6 +51,7 @@
<xi:include href="xml/element-cairotextoverlay.xml" />
<xi:include href="xml/element-cairotimeoverlay.xml" />
<xi:include href="xml/element-cairorender.xml" />
<xi:include href="xml/element-cairooverlay.xml" />
<xi:include href="xml/element-capssetter.xml" />
<xi:include href="xml/element-cmmldec.xml" />
<xi:include href="xml/element-cmmlenc.xml" />

12
docs/plugins/gst-plugins-good-plugins-sections.txt
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@ -465,6 +465,18 @@ GST_CAIRO_RENDER_CLASS
gst_cairo_render_get_type
</SECTION>
<SECTION>
<FILE>element-cairooverlay</FILE>
<TITLE>cairooverlay</TITLE>
GstCairoOverlay
<SUBSECTION Standard>
GstCairoOverlayClass
GST_TYPE_CAIRO_OVERLAY
GST_CAIRO_OVERLAY
GST_CAIRO_OVERLAY_CLASS
gst_cairo_overlay_get_type
</SECTION>
<SECTION>
<FILE>element-capssetter</FILE>
<TITLE>capssetter</TITLE>

2
ext/cairo/.gitignore vendored Normal file
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@ -0,0 +1,2 @@
gstcairo-marshal.c
gstcairo-marshal.h

39
ext/cairo/Makefile.am
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@ -1,20 +1,45 @@
plugin_LTLIBRARIES = libgstcairo.la
noinst_HEADERS = gsttimeoverlay.h gsttextoverlay.h gstcairorender.h
if USE_CAIRO_GOBJECT
glib_enum_define = GST_CAIRO
glib_gen_prefix = gst_cairo
glib_gen_basename = gstcairo
include $(top_srcdir)/common/gst-glib-gen.mak
built_sources = gstcairo-marshal.c
built_headers = gstcairo-marshal.h
BUILT_SOURCES = $(built_sources) $(built_headers)
gstcairo_gobject_dep_sources = gstcairooverlay.c
gstcairo_gobject_dep_headers = gstcairooverlay.h
CLEANFILES = $(BUILT_SOURCES)
endif
noinst_HEADERS = \
gsttimeoverlay.h \
gsttextoverlay.h \
gstcairorender.h \
$(gstcairo_gobject_dep_headers)
libgstcairo_la_SOURCES = \
gstcairo.c \
gsttimeoverlay.c \
gsttextoverlay.c \
gstcairorender.c
gstcairorender.c \
$(gstcairo_gobject_dep_sources)
nodist_libgstcairo_la_SOURCES = \
$(built_sources)
libgstcairo_la_CFLAGS = \
$(GST_PLUGINS_BASE_CFLAGS) \
$(GST_PLUGINS_BASE_CFLAGS) \
$(GST_BASE_CFLAGS) \
$(GST_CFLAGS) $(CAIRO_CFLAGS)
$(GST_CFLAGS) $(CAIRO_CFLAGS) $(CAIRO_GOBJECT_CFLAGS)
libgstcairo_la_LIBADD = \
$(GST_BASE_LIBS) \
$(GST_LIBS) $(CAIRO_LIBS) $(LIBM)
$(GST_BASE_LIBS) -lgstvideo-$(GST_MAJORMINOR) \
$(GST_LIBS) $(CAIRO_LIBS) $(CAIRO_GOBJECT_LIBS) $(LIBM)
libgstcairo_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstcairo_la_LIBTOOLFLAGS = --tag=disable-static
EXTRA_DIST = cairo-marshal.list

2
ext/cairo/gstcairo-marshal.list Normal file
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@ -0,0 +1,2 @@
VOID:BOXED,UINT64,UINT64
VOID:BOXED

9
ext/cairo/gstcairo.c
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@ -25,6 +25,11 @@
#include <gsttimeoverlay.h>
#include <gsttextoverlay.h>
#include <gstcairorender.h>
#ifdef HAVE_CAIRO_GOBJECT
#include <gstcairooverlay.h>
#endif
#include <string.h>
#include <math.h>
@ -37,6 +42,10 @@ plugin_init (GstPlugin * plugin)
GST_TYPE_CAIRO_TEXT_OVERLAY);
gst_element_register (plugin, "cairotimeoverlay", GST_RANK_NONE,
GST_TYPE_CAIRO_TIME_OVERLAY);
#ifdef HAVE_CAIRO_GOBJECT
gst_element_register (plugin, "cairooverlay", GST_RANK_NONE,
GST_TYPE_CAIRO_OVERLAY);
#endif
gst_element_register (plugin, "cairorender", GST_RANK_SECONDARY,
GST_TYPE_CAIRO_RENDER);

245
ext/cairo/gstcairooverlay.c Normal file
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@ -0,0 +1,245 @@
/* GStreamer
* Copyright (C) <2011> Jon Nordby <jononor@gmail.com>
*
* 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-cairooverlay
*
* cairooverlay renders an overlay using a application provided render function.
*
* The full example can be found in tests/examples/cairo/cairo_overlay.c
* <refsect2>
* <title>Example code</title>
* |[
*
* #include &lt;gst/gst.h&gt;
* #include &lt;gst/video/video.h&gt;
*
* ...
*
* typedef struct {
* gboolean valid;
* int width;
* int height;
* } CairoOverlayState;
*
* ...
*
* static void
* prepare_overlay (GstElement * overlay, GstCaps * caps, gpointer user_data)
* {
* CairoOverlayState *state = (CairoOverlayState *)user_data;
*
* gst_video_format_parse_caps (caps, NULL, &amp;state-&gt;width, &amp;state-&gt;height);
* state-&gt;valid = TRUE;
* }
*
* static void
* draw_overlay (GstElement * overlay, cairo_t * cr, guint64 timestamp,
* guint64 duration, gpointer user_data)
* {
* CairoOverlayState *s = (CairoOverlayState *)user_data;
* double scale;
*
* if (!s-&gt;valid)
* return;
*
* scale = 2*(((timestamp/(int)1e7) % 70)+30)/100.0;
* cairo_translate(cr, s-&gt;width/2, (s-&gt;height/2)-30);
* cairo_scale (cr, scale, scale);
*
* cairo_move_to (cr, 0, 0);
* cairo_curve_to (cr, 0,-30, -50,-30, -50,0);
* cairo_curve_to (cr, -50,30, 0,35, 0,60 );
* cairo_curve_to (cr, 0,35, 50,30, 50,0 ); *
* cairo_curve_to (cr, 50,-30, 0,-30, 0,0 );
* cairo_set_source_rgba (cr, 0.9, 0.0, 0.1, 0.7);
* cairo_fill (cr);
* }
*
* ...
*
* cairo_overlay = gst_element_factory_make (&quot;cairooverlay&quot;, &quot;overlay&quot;);
*
* g_signal_connect (cairo_overlay, &quot;draw&quot;, G_CALLBACK (draw_overlay),
* overlay_state);
* g_signal_connect (cairo_overlay, &quot;caps-changed&quot;,
* G_CALLBACK (prepare_overlay), overlay_state);
* ...
*
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcairooverlay.h"
#include "gstcairo-marshal.h"
#include <gst/video/video.h>
#include <cairo.h>
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define ARGB_CAPS GST_VIDEO_CAPS_BGRx " ; " GST_VIDEO_CAPS_BGRA " ; "
#else
#define ARGB_CAPS GST_VIDEO_CAPS_xRGB " ; " GST_VIDEO_CAPS_ARGB " ; "
#endif
static GstStaticPadTemplate gst_cairo_overlay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ARGB_CAPS)
);
static GstStaticPadTemplate gst_cairo_overlay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ARGB_CAPS)
);
GST_BOILERPLATE (GstCairoOverlay, gst_cairo_overlay, GstVideoFilter,
GST_TYPE_VIDEO_FILTER);
enum
{
SIGNAL_DRAW,
SIGNAL_CAPS_CHANGED,
N_SIGNALS
};
static guint gst_cairo_overlay_signals[N_SIGNALS];
static gboolean
gst_cairo_overlay_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (btrans);
GstStructure *s = gst_caps_get_structure (incaps, 0);
if (!gst_structure_get_int (s, "bpp", &(overlay->bpp))) {
return FALSE;
}
g_signal_emit (overlay, gst_cairo_overlay_signals[SIGNAL_CAPS_CHANGED], 0,
incaps, NULL);
return G_LIKELY (gst_video_format_parse_caps (incaps,
&overlay->caps_format, &overlay->caps_width, &overlay->caps_height));
}
static GstFlowReturn
gst_cairo_overlay_transform_ip (GstBaseTransform * btrans, GstBuffer * buf)
{
GstCairoOverlay *overlay = GST_CAIRO_OVERLAY (btrans);
cairo_surface_t *surface;
cairo_t *cr;
cairo_format_t format;
format = (overlay->bpp == 32) ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24;
surface =
cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf), format,
overlay->caps_width, overlay->caps_height, overlay->caps_width * 4);
if (G_UNLIKELY (!surface))
return GST_FLOW_ERROR;
cr = cairo_create (surface);
if (G_UNLIKELY (!cr)) {
cairo_surface_destroy (surface);
return GST_FLOW_ERROR;
}
g_signal_emit (overlay, gst_cairo_overlay_signals[SIGNAL_DRAW], 0,
cr, GST_BUFFER_TIMESTAMP (buf), GST_BUFFER_DURATION (buf), NULL);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return GST_FLOW_OK;
}
static void
gst_cairo_overlay_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "Cairo overlay",
"Filter/Editor/Video",
"Render overlay on a video stream using Cairo",
"Jon Nordby <jononor@gmail.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_cairo_overlay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_cairo_overlay_src_template));
}
static void
gst_cairo_overlay_class_init (GstCairoOverlayClass * klass)
{
GstBaseTransformClass *trans_class;
trans_class = (GstBaseTransformClass *) klass;
trans_class->set_caps = gst_cairo_overlay_set_caps;
trans_class->transform_ip = gst_cairo_overlay_transform_ip;
/**
* GstCairoOverlay::draw:
* @overlay: Overlay element emitting the signal.
* @cr: Cairo context to draw to.
* @timestamp: Timestamp (see GstClockTime) of the current buffer.
* @duration: Duration (see GstClockTime) of the current buffer.
*
* This signal is emitted when the overlay should be drawn.
*/
gst_cairo_overlay_signals[SIGNAL_DRAW] =
g_signal_new ("draw",
G_TYPE_FROM_CLASS (klass),
0,
0,
NULL,
NULL,
gst_cairo_marshal_VOID__BOXED_UINT64_UINT64,
G_TYPE_NONE, 3, CAIRO_GOBJECT_TYPE_CONTEXT, G_TYPE_UINT64, G_TYPE_UINT64);
/**
* GstCairoOverlay::caps-changed:
* @overlay: Overlay element emitting the signal.
* @caps: The caps of the element.
*
* This signal is emitted when the caps of the element has changed.
*/
gst_cairo_overlay_signals[SIGNAL_CAPS_CHANGED] =
g_signal_new ("caps-changed",
G_TYPE_FROM_CLASS (klass),
0,
0,
NULL, NULL, gst_cairo_marshal_VOID__BOXED, G_TYPE_NONE, 1, GST_TYPE_CAPS);
}
static void
gst_cairo_overlay_init (GstCairoOverlay * overlay, GstCairoOverlayClass * klass)
{
}

60
ext/cairo/gstcairooverlay.h Normal file
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@ -0,0 +1,60 @@
/* GStreamer
* Copyright (C) <2011> Jon Nordby <jononor@gmail.com>
*
* 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_CAIRO_OVERLAY_H__
#define __GST_CAIRO_OVERLAY_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideofilter.h>
#include <cairo.h>
#include <cairo-gobject.h>
G_BEGIN_DECLS
#define GST_TYPE_CAIRO_OVERLAY \
(gst_cairo_overlay_get_type())
#define GST_CAIRO_OVERLAY(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CAIRO_OVERLAY,GstCairoOverlay))
#define GST_CAIRO_OVERLAY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CAIRO_OVERLAY,GstCairoOverlayClass))
#define GST_IS_CAIRO_OVERLAY(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CAIRO_OVERLAY))
#define GST_IS_CAIRO_OVERLAY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CAIRO_OVERLAY))
typedef struct _GstCairoOverlay {
GstVideoFilter parent_instance;
/* < private > */
GstVideoFormat caps_format;
int caps_width;
int caps_height;
int bpp;
} GstCairoOverlay;
typedef struct _GstCairoOverlayClass {
GstVideoFilterClass parent_class;
} GstCairoOverlayClass;
GType gst_cairo_overlay_get_type(void);
G_END_DECLS
#endif /* __GST_CAIRO_OVERLAY_H__ */

12
tests/examples/Makefile.am
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@ -4,8 +4,16 @@ else
JACK_DIR=
endif
SUBDIRS = audiofx equalizer $(JACK_DIR) level pulse rtp shapewipe spectrum v4l2
if USE_CAIRO
CAIRO_DIR=cairo
else
CAIRO_DIR=
endif
DIST_SUBDIRS = audiofx equalizer jack level pulse rtp shapewipe spectrum v4l2
SUBDIRS = audiofx equalizer $(JACK_DIR) level pulse \
rtp shapewipe spectrum v4l2 $(CAIRO_DIR)
DIST_SUBDIRS = audiofx equalizer jack level pulse \
rtp shapewipe spectrum v4l2 $(CAIRO_DIR)
include $(top_srcdir)/common/parallel-subdirs.mak

1
tests/examples/cairo/.gitignore vendored Normal file
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@ -0,0 +1 @@
cairo_overlay

11
tests/examples/cairo/Makefile.am Normal file
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@ -0,0 +1,11 @@
if USE_CAIRO_GOBJECT
if HAVE_GTK
noinst_PROGRAMS = cairo_overlay
endif
endif
cairo_overlay_SOURCES = cairo_overlay.c
cairo_overlay_CFLAGS = $(GST_CFLAGS) $(GTK_CFLAGS) $(CAIRO_CFLAGS)
cairo_overlay_LDFLAGS = \
$(GST_LIBS) -lgstinterfaces-0.10 -lgstvideo-$(GST_MAJORMINOR) \
$(GTK_LIBS) $(CAIRO_LIBS)

199
tests/examples/cairo/cairo_overlay.c Normal file
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@ -0,0 +1,199 @@
/* GStreamer
* Copyright (C) 2011 Jon Nordby <jononor@gmail.com>
*
* 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.
*/
/*
* Example showing usage of the cairooverlay element
*
* Note: The example program not run on non-X11 platforms because
* it is using the xvimageoverlay element. That part of the code was
* roughly based on gst_x_overlay documentation.
*/
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/interfaces/xoverlay.h>
#include <gtk/gtk.h>
#include <cairo.h>
#include <cairo-gobject.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
static gulong video_window_xid = 0;
static GstBusSyncReply
bus_sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
{
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
return GST_BUS_PASS;
if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
return GST_BUS_PASS;
if (video_window_xid != 0) {
GstXOverlay *xoverlay;
xoverlay = GST_X_OVERLAY (GST_MESSAGE_SRC (message));
gst_x_overlay_set_window_handle (xoverlay, video_window_xid);
} else {
g_warning ("Should have obtained video_window_xid by now!");
}
gst_message_unref (message);
return GST_BUS_DROP;
}
static void
video_widget_realize_cb (GtkWidget * widget, gpointer data)
{
#ifdef GDK_WINDOWING_X11
video_window_xid = GDK_WINDOW_XID (widget->window);
#endif
}
static GtkWidget *
setup_gtk_window (void)
{
GtkWidget *video_window;
GtkWidget *app_window;
app_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
video_window = gtk_drawing_area_new ();
g_signal_connect (video_window, "realize",
G_CALLBACK (video_widget_realize_cb), NULL);
gtk_widget_set_double_buffered (video_window, FALSE);
gtk_container_add (GTK_CONTAINER (app_window), video_window);
gtk_widget_show_all (app_window);
gtk_widget_realize (app_window);
g_assert (video_window_xid != 0);
return app_window;
}
/* Datastructure to share the state we are interested in between
* prepare and render function. */
typedef struct
{
gboolean valid;
int width;
int height;
} CairoOverlayState;
/* Store the information from the caps that we are interested in. */
static void
prepare_overlay (GstElement * overlay, GstCaps * caps, gpointer user_data)
{
CairoOverlayState *state = (CairoOverlayState *) user_data;
gst_video_format_parse_caps (caps, NULL, &state->width, &state->height);
state->valid = TRUE;
}
/* Draw the overlay.
* This function draws a cute "beating" heart. */
static void
draw_overlay (GstElement * overlay, cairo_t * cr, guint64 timestamp,
guint64 duration, gpointer user_data)
{
CairoOverlayState *s = (CairoOverlayState *) user_data;
double scale;
if (!s->valid)
return;
scale = 2 * (((timestamp / (int) 1e7) % 70) + 30) / 100.0;
cairo_translate (cr, s->width / 2, (s->height / 2) - 30);
cairo_scale (cr, scale, scale);
cairo_move_to (cr, 0, 0);
cairo_curve_to (cr, 0, -30, -50, -30, -50, 0);
cairo_curve_to (cr, -50, 30, 0, 35, 0, 60);
cairo_curve_to (cr, 0, 35, 50, 30, 50, 0);
cairo_curve_to (cr, 50, -30, 0, -30, 0, 0);
cairo_set_source_rgba (cr, 0.9, 0.0, 0.1, 0.7);
cairo_fill (cr);
}
static GstElement *
setup_gst_pipeline (CairoOverlayState * overlay_state)
{
GstElement *pipeline;
GstElement *cairo_overlay;
GstElement *source, *adaptor1, *adaptor2, *sink;
GstBus *bus;
pipeline = gst_pipeline_new ("cairo-overlay-example");
/* Adaptors needed because cairooverlay only supports ARGB data */
source = gst_element_factory_make ("videotestsrc", "source");
adaptor1 = gst_element_factory_make ("ffmpegcolorspace", "adaptor1");
cairo_overlay = gst_element_factory_make ("cairooverlay", "overlay");
adaptor2 = gst_element_factory_make ("ffmpegcolorspace", "adaptor2");
sink = gst_element_factory_make ("xvimagesink", "sink");
/* If failing, the element could not be created */
g_assert (cairo_overlay);
/* Hook up the neccesary signals for cairooverlay */
g_signal_connect (cairo_overlay, "draw",
G_CALLBACK (draw_overlay), overlay_state);
g_signal_connect (cairo_overlay, "caps-changed",
G_CALLBACK (prepare_overlay), overlay_state);
gst_bin_add_many (GST_BIN (pipeline), source, adaptor1,
cairo_overlay, adaptor2, sink, NULL);
if (!gst_element_link_many (source, adaptor1,
cairo_overlay, adaptor2, sink, NULL)) {
g_warning ("Failed to link elements!");
}
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bus_sync_handler, NULL);
gst_object_unref (bus);
return pipeline;
}
int
main (int argc, char **argv)
{
GtkWidget *window;
GstElement *pipeline;
CairoOverlayState *overlay_state;
gtk_init (&argc, &argv);
gst_init (&argc, &argv);
window = setup_gtk_window ();
overlay_state = g_new (CairoOverlayState, 1);
pipeline = setup_gst_pipeline (overlay_state);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
gtk_main ();
gst_object_unref (pipeline);
gtk_widget_destroy (GTK_WIDGET (window));
g_free (overlay_state);
}