Update

subprojects/gst-docs/examples/tutorials/basic-tutorial-15.c

@@ -0,0 +1,108 @@
+#include <clutter-gst/clutter-gst.h>
+
+/* Setup the video texture once its size is known */
+void
+size_change (ClutterActor * texture, gint width, gint height,
+    gpointer user_data)
+{
+  ClutterActor *stage;
+  gfloat new_x, new_y, new_width, new_height;
+  gfloat stage_width, stage_height;
+  ClutterAnimation *animation = NULL;
+
+  stage = clutter_actor_get_stage (texture);
+  if (stage == NULL)
+    return;
+
+  clutter_actor_get_size (stage, &stage_width, &stage_height);
+
+  /* Center video on window and calculate new size preserving aspect ratio */
+  new_height = (height * stage_width) / width;
+  if (new_height <= stage_height) {
+    new_width = stage_width;
+
+    new_x = 0;
+    new_y = (stage_height - new_height) / 2;
+  } else {
+    new_width = (width * stage_height) / height;
+    new_height = stage_height;
+
+    new_x = (stage_width - new_width) / 2;
+    new_y = 0;
+  }
+  clutter_actor_set_position (texture, new_x, new_y);
+  clutter_actor_set_size (texture, new_width, new_height);
+  clutter_actor_set_rotation (texture, CLUTTER_Y_AXIS, 0.0, stage_width / 2, 0,
+      0);
+  /* Animate it */
+  animation =
+      clutter_actor_animate (texture, CLUTTER_LINEAR, 10000, "rotation-angle-y",
+      360.0, NULL);
+  clutter_animation_set_loop (animation, TRUE);
+}
+
+int
+main (int argc, char *argv[])
+{
+  GstElement *pipeline, *sink;
+  ClutterTimeline *timeline;
+  ClutterActor *stage, *texture;
+
+  /* clutter-gst takes care of initializing Clutter and GStreamer */
+  if (clutter_gst_init (&argc, &argv) != CLUTTER_INIT_SUCCESS) {
+    g_error ("Failed to initialize clutter\n");
+    return -1;
+  }
+
+  stage = clutter_stage_get_default ();
+
+  /* Make a timeline */
+  timeline = clutter_timeline_new (1000);
+  g_object_set (timeline, "loop", TRUE, NULL);
+
+  /* Create new texture and disable slicing so the video is properly mapped onto it */
+  texture =
+      CLUTTER_ACTOR (g_object_new (CLUTTER_TYPE_TEXTURE, "disable-slicing",
+          TRUE, NULL));
+  g_signal_connect (texture, "size-change", G_CALLBACK (size_change), NULL);
+
+  /* Build the GStreamer pipeline */
+  pipeline =
+      gst_parse_launch
+      ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
+      NULL);
+
+  /* Instantiate the Clutter sink */
+  sink = gst_element_factory_make ("autocluttersink", NULL);
+  if (sink == NULL) {
+    /* Revert to the older cluttersink, in case autocluttersink was not found */
+    sink = gst_element_factory_make ("cluttersink", NULL);
+  }
+  if (sink == NULL) {
+    g_printerr ("Unable to find a Clutter sink.\n");
+    return -1;
+  }
+
+  /* Link GStreamer with Clutter by passing the Clutter texture to the Clutter sink */
+  g_object_set (sink, "texture", texture, NULL);
+
+  /* Add the Clutter sink to the pipeline */
+  g_object_set (pipeline, "video-sink", sink, NULL);
+
+  /* Start playing */
+  gst_element_set_state (pipeline, GST_STATE_PLAYING);
+
+  /* start the timeline */
+  clutter_timeline_start (timeline);
+
+  /* Add texture to the stage, and show it */
+  clutter_group_add (CLUTTER_GROUP (stage), texture);
+  clutter_actor_show_all (stage);
+
+  clutter_main ();
+
+  /* Free resources */
+  gst_element_set_state (pipeline, GST_STATE_NULL);
+  gst_object_unref (pipeline);
+  return 0;
+}