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>
123 lines
3 KiB
C
123 lines
3 KiB
C
#include <gst/gst.h>
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#include <string.h>
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#ifdef __APPLE__
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#include <TargetConditionals.h>
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#endif
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typedef struct _CustomData
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{
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gboolean is_live;
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GstElement *pipeline;
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GMainLoop *loop;
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} CustomData;
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static void
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cb_message (GstBus * bus, GstMessage * msg, CustomData * data)
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{
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:{
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GError *err;
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gchar *debug;
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gst_message_parse_error (msg, &err, &debug);
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g_print ("Error: %s\n", err->message);
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g_error_free (err);
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g_free (debug);
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gst_element_set_state (data->pipeline, GST_STATE_READY);
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g_main_loop_quit (data->loop);
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break;
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}
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case GST_MESSAGE_EOS:
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/* end-of-stream */
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gst_element_set_state (data->pipeline, GST_STATE_READY);
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g_main_loop_quit (data->loop);
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break;
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case GST_MESSAGE_BUFFERING:{
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gint percent = 0;
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/* If the stream is live, we do not care about buffering. */
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if (data->is_live)
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break;
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gst_message_parse_buffering (msg, &percent);
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g_print ("Buffering (%3d%%)\r", percent);
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/* Wait until buffering is complete before start/resume playing */
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if (percent < 100)
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gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
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else
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gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
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break;
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}
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case GST_MESSAGE_CLOCK_LOST:
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/* Get a new clock */
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gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
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gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
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break;
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default:
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/* Unhandled message */
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break;
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}
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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;
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GstBus *bus;
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GstStateChangeReturn ret;
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GMainLoop *main_loop;
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CustomData data;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Initialize our data structure */
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memset (&data, 0, sizeof (data));
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/* Build the 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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bus = gst_element_get_bus (pipeline);
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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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} else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
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data.is_live = TRUE;
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}
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main_loop = g_main_loop_new (NULL, FALSE);
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data.loop = main_loop;
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data.pipeline = pipeline;
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gst_bus_add_signal_watch (bus);
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g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);
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g_main_loop_run (main_loop);
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/* Free resources */
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g_main_loop_unref (main_loop);
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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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