--- /dev/null
+/*
+ * GStreamer
+ * Copyright (C) 2017 Thibault Saunier <thibault.saunier@osg-samsung.com>
+ * Copyright (C) 2020 Jan Schmidt <jan@centricular.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 example using the compositor element.
+ *
+ * Takes two video files and display them side-by-side as a mosaic
+ */
+
+#include <stdlib.h>
+#include <gst/gst.h>
+#include <gst/video/video.h>
+
+typedef struct
+{
+ GstElement *compositor;
+ gint x, y, w, h;
+ gint zorder;
+} 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)
+{
+ GstStructure *converter_config;
+ GstPad *sinkpad =
+ gst_element_get_request_pad (GST_ELEMENT (info->compositor), "sink_%u");
+
+ converter_config = gst_structure_new ("GstVideoConverter",
+ GST_VIDEO_CONVERTER_OPT_THREADS, G_TYPE_UINT, 0,
+ GST_VIDEO_CONVERTER_OPT_RESAMPLER_METHOD, GST_TYPE_VIDEO_RESAMPLER_METHOD,
+ GST_VIDEO_RESAMPLER_METHOD_NEAREST, GST_VIDEO_CONVERTER_OPT_DEST_X,
+ G_TYPE_INT, 0, GST_VIDEO_CONVERTER_OPT_DEST_Y, G_TYPE_INT, 0,
+ GST_VIDEO_CONVERTER_OPT_DEST_WIDTH, G_TYPE_INT, info->w,
+ GST_VIDEO_CONVERTER_OPT_DEST_HEIGHT, G_TYPE_INT, info->h, NULL);
+
+ g_object_set (sinkpad, "xpos", info->x, "ypos", info->y, "width", info->w,
+ "height", info->h, "converter-config", converter_config, NULL);
+
+ gst_structure_free (converter_config);
+
+ gst_pad_link (pad, sinkpad);
+
+ g_free (info);
+}
+
+int
+main (int argc, char *argv[])
+{
+ gint i;
+ GstMessage *message;
+ GstElement *compositor, *pipeline;
+ GstBus *bus;
+
+ if (argc != 3) {
+ g_error ("Need to provide 2 input videos");
+ return -1;
+ }
+
+ gst_init (&argc, &argv);
+ pipeline =
+ gst_parse_launch
+ ("videotestsrc pattern=black is-live=true ! video/x-raw,width=1,height=1,format=AYUV ! compositor name=comp start-time-selection=first ! video/x-raw,format=AYUV,width=1275,height=833,framerate=25/1 ! videoconvert ! autovideosink",
+ NULL);
+
+ g_assert (pipeline != NULL);
+ compositor = gst_bin_get_by_name (GST_BIN (pipeline), "comp");
+
+ gst_util_set_object_arg (G_OBJECT (compositor), "background", "black");
+
+ 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;
+ if (i == 1) {
+ info->x = 326;
+ info->y = 155;
+ info->w = 930;
+ info->h = 523;
+ info->zorder = 2;
+ } else {
+ info->x = 19;
+ info->y = 155;
+ info->w = 288;
+ info->h = 162;
+ info->zorder = 3;
+ }
+ 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, 60 * GST_SECOND,
+ GST_MESSAGE_EOS | GST_MESSAGE_ERROR);
+ GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS (GST_BIN (pipeline),
+ GST_DEBUG_GRAPH_SHOW_ALL | GST_DEBUG_GRAPH_SHOW_VERBOSE, "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;
+}