gstreamer/tests/examples/cairo/cairo_overlay.c
Sebastian Dröge 08232b470e cairooverlay: The example always requires gtk-x11
Check for gtk-x11 and only build the example if it's available.
2011-03-02 23:21:15 +01:00

195 lines
5.6 KiB
C

/* 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 <cairo.h>
#include <cairo-gobject.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>
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)
{
video_window_xid = GDK_WINDOW_XID (widget->window);
}
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_new0 (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);
}