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/*
* GStreamer
* Copyright (C) 2017 Thibault Saunier <thibault.saunier@osg-samsung.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* Simple crossfade example using the compositor element.
*
* Takes two video files and crossfades them for 10 seconds and returns.
*/
#include <stdlib.h>
#include <gst/gst.h>
#include <gst/controller/gstdirectcontrolbinding.h>
#include <gst/controller/gstinterpolationcontrolsource.h>
typedef struct
{
GstElement *compositor;
guint z_order;
} VideoInfo;
static gchar *
ensure_uri (const gchar * location)
{
if (gst_uri_is_valid (location))
return g_strdup (location);
else
return gst_filename_to_uri (location, NULL);
}
static void
_pad_added_cb (GstElement * decodebin, GstPad * pad, VideoInfo * info)
{
GstPad *sinkpad =
gst_element_get_request_pad (GST_ELEMENT (info->compositor), "sink_%u");
GstControlSource *control_source;
gboolean is_last = info->z_order == 1;
control_source = gst_interpolation_control_source_new ();
gst_util_set_object_arg (G_OBJECT (sinkpad), "operator",
info->z_order == 0 ? "source" : "add");
gst_object_add_control_binding (GST_OBJECT (sinkpad),
gst_direct_control_binding_new_absolute (GST_OBJECT (sinkpad), "alpha",
control_source));
g_object_set (control_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
gst_timed_value_control_source_set (GST_TIMED_VALUE_CONTROL_SOURCE
(control_source), 0, is_last ? 0.0 : 1.0);
gst_timed_value_control_source_set (GST_TIMED_VALUE_CONTROL_SOURCE
(control_source), 10 * GST_SECOND, is_last ? 1.0 : 0.0);
g_object_set (sinkpad, "zorder", info->z_order, NULL);
gst_pad_link (pad, sinkpad);
g_free (info);
}
int
main (int argc, char *argv[])
{
gint i;
GstMessage *message;
GstElement *compositor, *sink, *pipeline;
GstBus *bus;
if (argc != 3) {
g_error ("Need to provide 2 input videos");
return -1;
}
gst_init (&argc, &argv);
pipeline = gst_element_factory_make ("pipeline", NULL);
compositor = gst_element_factory_make ("compositor", NULL);
sink =
gst_parse_bin_from_description ("videoconvert ! autovideosink", TRUE,
NULL);
gst_util_set_object_arg (G_OBJECT (compositor), "background", "black");
gst_bin_add_many (GST_BIN (pipeline), compositor, sink, NULL);
g_assert (gst_element_link (compositor, sink));
for (i = 1; i < 3; i++) {
gchar *uri = ensure_uri (argv[i]);
VideoInfo *info = g_malloc0 (sizeof (VideoInfo));
GstElement *uridecodebin = gst_element_factory_make ("uridecodebin", NULL);
g_object_set (uridecodebin, "uri", uri, "expose-all-streams", FALSE,
"caps", gst_caps_from_string ("video/x-raw(ANY)"), NULL);
info->compositor = compositor;
info->z_order = i - 1;
g_signal_connect (uridecodebin, "pad-added", (GCallback) _pad_added_cb,
info);
gst_bin_add (GST_BIN (pipeline), uridecodebin);
}
bus = gst_element_get_bus (pipeline);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
message =
gst_bus_timed_pop_filtered (bus, 11 * GST_SECOND,
GST_MESSAGE_EOS | GST_MESSAGE_ERROR);
GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS (GST_BIN (pipeline),
GST_DEBUG_GRAPH_SHOW_ALL, "go");
if (message)
gst_print ("%" GST_PTR_FORMAT "\n", message);
else
gst_print ("Timeout\n");
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
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