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3bb8700577
On macOS, a Cocoa event loop is needed in the main thread to ensure things like opening a GL window work correctly. In the past, this was patched into glib via Cerbero, but that prevented us from updating it. This workaround simply runs an NSApplication and then calls the main function on a secondary thread, allowing GStreamer to correctly display windows and/or system permission prompts, for example. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3532>
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
#include <clutter-gst/clutter-gst.h>
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#ifdef __APPLE__
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#include <TargetConditionals.h>
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#endif
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/* Setup the video texture once its size is known */
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void
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size_change (ClutterActor * texture, gint width, gint height,
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gpointer user_data)
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{
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ClutterActor *stage;
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gfloat new_x, new_y, new_width, new_height;
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gfloat stage_width, stage_height;
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ClutterAnimation *animation = NULL;
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stage = clutter_actor_get_stage (texture);
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if (stage == NULL)
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return;
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clutter_actor_get_size (stage, &stage_width, &stage_height);
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/* Center video on window and calculate new size preserving aspect ratio */
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new_height = (height * stage_width) / width;
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if (new_height <= stage_height) {
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new_width = stage_width;
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new_x = 0;
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new_y = (stage_height - new_height) / 2;
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} else {
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new_width = (width * stage_height) / height;
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new_height = stage_height;
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new_x = (stage_width - new_width) / 2;
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new_y = 0;
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}
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clutter_actor_set_position (texture, new_x, new_y);
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clutter_actor_set_size (texture, new_width, new_height);
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clutter_actor_set_rotation (texture, CLUTTER_Y_AXIS, 0.0, stage_width / 2, 0,
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0);
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/* Animate it */
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animation =
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clutter_actor_animate (texture, CLUTTER_LINEAR, 10000, "rotation-angle-y",
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360.0, NULL);
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clutter_animation_set_loop (animation, TRUE);
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}
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int
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tutorial_main (int argc, char *argv[])
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{
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GstElement *pipeline, *sink;
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ClutterTimeline *timeline;
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ClutterActor *stage, *texture;
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/* clutter-gst takes care of initializing Clutter and GStreamer */
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if (clutter_gst_init (&argc, &argv) != CLUTTER_INIT_SUCCESS) {
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g_error ("Failed to initialize clutter\n");
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return -1;
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}
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stage = clutter_stage_get_default ();
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/* Make a timeline */
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timeline = clutter_timeline_new (1000);
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g_object_set (timeline, "loop", TRUE, NULL);
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/* Create new texture and disable slicing so the video is properly mapped onto it */
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texture =
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CLUTTER_ACTOR (g_object_new (CLUTTER_TYPE_TEXTURE, "disable-slicing",
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TRUE, NULL));
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g_signal_connect (texture, "size-change", G_CALLBACK (size_change), NULL);
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/* Build the GStreamer pipeline */
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pipeline =
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gst_parse_launch
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("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
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NULL);
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/* Instantiate the Clutter sink */
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sink = gst_element_factory_make ("autocluttersink", NULL);
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if (sink == NULL) {
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/* Revert to the older cluttersink, in case autocluttersink was not found */
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sink = gst_element_factory_make ("cluttersink", NULL);
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}
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if (sink == NULL) {
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g_printerr ("Unable to find a Clutter sink.\n");
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return -1;
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}
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/* Link GStreamer with Clutter by passing the Clutter texture to the Clutter sink */
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g_object_set (sink, "texture", texture, NULL);
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/* Add the Clutter sink to the pipeline */
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g_object_set (pipeline, "video-sink", sink, NULL);
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/* Start playing */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* start the timeline */
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clutter_timeline_start (timeline);
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/* Add texture to the stage, and show it */
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clutter_group_add (CLUTTER_GROUP (stage), texture);
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clutter_actor_show_all (stage);
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clutter_main ();
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/* Free resources */
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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return 0;
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}
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int
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main (int argc, char *argv[])
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{
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#if defined(__APPLE__) && TARGET_OS_MAC && !TARGET_OS_IPHONE
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return gst_macos_main (tutorial_main, argc, argv, NULL);
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#else
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return tutorial_main (argc, argv);
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#endif
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}
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