mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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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>
116 lines
3 KiB
C
116 lines
3 KiB
C
#include <gst/gst.h>
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#ifdef __APPLE__
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#include <TargetConditionals.h>
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#endif
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/* playbin2 flags */
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typedef enum
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{
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GST_PLAY_FLAG_VIS = (1 << 3) /* Enable rendering of visualizations when there is no video stream. */
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} GstPlayFlags;
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/* Return TRUE if this is a Visualization element */
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static gboolean
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filter_vis_features (GstPluginFeature * feature, gpointer data)
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{
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GstElementFactory *factory;
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if (!GST_IS_ELEMENT_FACTORY (feature))
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return FALSE;
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factory = GST_ELEMENT_FACTORY (feature);
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if (!g_strrstr (gst_element_factory_get_klass (factory), "Visualization"))
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return FALSE;
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return 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, *vis_plugin;
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GstBus *bus;
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GstMessage *msg;
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GList *list, *walk;
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GstElementFactory *selected_factory = NULL;
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guint flags;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Get a list of all visualization plugins */
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list =
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gst_registry_feature_filter (gst_registry_get (), filter_vis_features,
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FALSE, NULL);
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/* Print their names */
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g_print ("Available visualization plugins:\n");
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for (walk = list; walk != NULL; walk = g_list_next (walk)) {
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const gchar *name;
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GstElementFactory *factory;
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factory = GST_ELEMENT_FACTORY (walk->data);
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name = gst_element_factory_get_longname (factory);
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g_print (" %s\n", name);
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if (selected_factory == NULL || g_str_has_prefix (name, "GOOM")) {
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selected_factory = factory;
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}
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}
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/* Don't use the factory if it's still empty */
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/* e.g. no visualization plugins found */
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if (!selected_factory) {
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g_print ("No visualization plugins found!\n");
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return -1;
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}
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/* We have now selected a factory for the visualization element */
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g_print ("Selected '%s'\n",
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gst_element_factory_get_longname (selected_factory));
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vis_plugin = gst_element_factory_create (selected_factory, NULL);
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if (!vis_plugin)
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return -1;
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/* Build the pipeline */
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pipeline =
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gst_parse_launch ("playbin uri=http://radio.hbr1.com:19800/ambient.ogg",
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NULL);
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/* Set the visualization flag */
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g_object_get (pipeline, "flags", &flags, NULL);
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flags |= GST_PLAY_FLAG_VIS;
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g_object_set (pipeline, "flags", flags, NULL);
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/* set vis plugin for playbin2 */
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g_object_set (pipeline, "vis-plugin", vis_plugin, NULL);
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/* Start playing */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* Wait until error or EOS */
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bus = gst_element_get_bus (pipeline);
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msg =
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gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
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GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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/* Free resources */
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if (msg != NULL)
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gst_message_unref (msg);
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gst_plugin_feature_list_free (list);
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gst_object_unref (bus);
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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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