gstreamer/subprojects/gst-docs/examples/tutorials/basic-tutorial-12.c

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#include <gst/gst.h>
#include <string.h>
#ifdef __APPLE__
#include <TargetConditionals.h>
#endif
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typedef struct _CustomData
{
gboolean is_live;
GstElement *pipeline;
GMainLoop *loop;
} CustomData;
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static void
cb_message (GstBus * bus, GstMessage * msg, CustomData * data)
{
switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_ERROR:{
GError *err;
gchar *debug;
gst_message_parse_error (msg, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
g_free (debug);
gst_element_set_state (data->pipeline, GST_STATE_READY);
g_main_loop_quit (data->loop);
break;
}
case GST_MESSAGE_EOS:
/* end-of-stream */
gst_element_set_state (data->pipeline, GST_STATE_READY);
g_main_loop_quit (data->loop);
break;
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case GST_MESSAGE_BUFFERING:{
gint percent = 0;
/* If the stream is live, we do not care about buffering. */
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if (data->is_live)
break;
gst_message_parse_buffering (msg, &percent);
g_print ("Buffering (%3d%%)\r", percent);
/* Wait until buffering is complete before start/resume playing */
if (percent < 100)
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
else
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
break;
}
case GST_MESSAGE_CLOCK_LOST:
/* Get a new clock */
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
break;
default:
/* Unhandled message */
break;
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}
}
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int
tutorial_main (int argc, char *argv[])
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{
GstElement *pipeline;
GstBus *bus;
GstStateChangeReturn ret;
GMainLoop *main_loop;
CustomData data;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Initialize our data structure */
memset (&data, 0, sizeof (data));
/* Build the pipeline */
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pipeline =
gst_parse_launch
("playbin uri=https://gstreamer.freedesktop.org/data/media/sintel_trailer-480p.webm",
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NULL);
bus = gst_element_get_bus (pipeline);
/* Start playing */
ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (pipeline);
return -1;
} else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
data.is_live = TRUE;
}
main_loop = g_main_loop_new (NULL, FALSE);
data.loop = main_loop;
data.pipeline = pipeline;
gst_bus_add_signal_watch (bus);
g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);
g_main_loop_run (main_loop);
/* Free resources */
g_main_loop_unref (main_loop);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
int
main (int argc, char *argv[])
{
#if defined(__APPLE__) && TARGET_OS_MAC && !TARGET_OS_IPHONE
return gst_macos_main ((GstMainFunc) tutorial_main, argc, argv, NULL);
#else
return tutorial_main (argc, argv);
#endif
}