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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>
97 lines
2.5 KiB
C
97 lines
2.5 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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int
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tutorial_main (int argc, char *argv[])
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{
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GstElement *pipeline, *source, *sink;
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GstBus *bus;
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GstMessage *msg;
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GstStateChangeReturn ret;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Create the elements */
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source = gst_element_factory_make ("videotestsrc", "source");
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sink = gst_element_factory_make ("autovideosink", "sink");
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/* Create the empty pipeline */
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pipeline = gst_pipeline_new ("test-pipeline");
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if (!pipeline || !source || !sink) {
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g_printerr ("Not all elements could be created.\n");
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return -1;
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}
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/* Build the pipeline */
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gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL);
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if (gst_element_link (source, sink) != TRUE) {
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g_printerr ("Elements could not be linked.\n");
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gst_object_unref (pipeline);
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return -1;
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}
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/* Modify the source's properties */
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g_object_set (source, "pattern", 0, NULL);
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/* Start playing */
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ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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g_printerr ("Unable to set the pipeline to the playing state.\n");
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gst_object_unref (pipeline);
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return -1;
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}
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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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/* Parse message */
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if (msg != NULL) {
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GError *err;
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gchar *debug_info;
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:
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gst_message_parse_error (msg, &err, &debug_info);
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g_printerr ("Error received from element %s: %s\n",
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GST_OBJECT_NAME (msg->src), err->message);
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g_printerr ("Debugging information: %s\n",
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debug_info ? debug_info : "none");
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g_clear_error (&err);
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g_free (debug_info);
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break;
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case GST_MESSAGE_EOS:
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g_print ("End-Of-Stream reached.\n");
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break;
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default:
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/* We should not reach here because we only asked for ERRORs and EOS */
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g_printerr ("Unexpected message received.\n");
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break;
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}
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gst_message_unref (msg);
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}
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/* Free resources */
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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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