mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-03 05:05:52 +00:00
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>
113 lines
4 KiB
C
113 lines
4 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, *audio_source, *tee, *audio_queue, *audio_convert,
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*audio_resample, *audio_sink;
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GstElement *video_queue, *visual, *video_convert, *video_sink;
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GstBus *bus;
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GstMessage *msg;
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GstPad *tee_audio_pad, *tee_video_pad;
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GstPad *queue_audio_pad, *queue_video_pad;
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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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audio_source = gst_element_factory_make ("audiotestsrc", "audio_source");
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tee = gst_element_factory_make ("tee", "tee");
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audio_queue = gst_element_factory_make ("queue", "audio_queue");
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audio_convert = gst_element_factory_make ("audioconvert", "audio_convert");
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audio_resample = gst_element_factory_make ("audioresample", "audio_resample");
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audio_sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
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video_queue = gst_element_factory_make ("queue", "video_queue");
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visual = gst_element_factory_make ("wavescope", "visual");
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video_convert = gst_element_factory_make ("videoconvert", "video_convert");
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video_sink = gst_element_factory_make ("autovideosink", "video_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 || !audio_source || !tee || !audio_queue || !audio_convert
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|| !audio_resample || !audio_sink || !video_queue || !visual
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|| !video_convert || !video_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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/* Configure elements */
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g_object_set (audio_source, "freq", 215.0f, NULL);
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g_object_set (visual, "shader", 0, "style", 1, NULL);
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/* Link all elements that can be automatically linked because they have "Always" pads */
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gst_bin_add_many (GST_BIN (pipeline), audio_source, tee, audio_queue,
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audio_convert, audio_resample, audio_sink, video_queue, visual,
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video_convert, video_sink, NULL);
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if (gst_element_link_many (audio_source, tee, NULL) != TRUE
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|| gst_element_link_many (audio_queue, audio_convert, audio_resample,
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audio_sink, NULL) != TRUE
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|| gst_element_link_many (video_queue, visual, video_convert, video_sink,
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NULL) != 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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/* Manually link the Tee, which has "Request" pads */
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tee_audio_pad = gst_element_request_pad_simple (tee, "src_%u");
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g_print ("Obtained request pad %s for audio branch.\n",
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gst_pad_get_name (tee_audio_pad));
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queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
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tee_video_pad = gst_element_request_pad_simple (tee, "src_%u");
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g_print ("Obtained request pad %s for video branch.\n",
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gst_pad_get_name (tee_video_pad));
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queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
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if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
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gst_pad_link (tee_video_pad, queue_video_pad) != GST_PAD_LINK_OK) {
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g_printerr ("Tee 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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gst_object_unref (queue_audio_pad);
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gst_object_unref (queue_video_pad);
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/* Start playing the pipeline */
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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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/* Release the request pads from the Tee, and unref them */
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gst_element_release_request_pad (tee, tee_audio_pad);
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gst_element_release_request_pad (tee, tee_video_pad);
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gst_object_unref (tee_audio_pad);
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gst_object_unref (tee_video_pad);
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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_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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