gst-basic-tutorial-1/basic-tutorial-2.c

80 lines
2.2 KiB
C
Raw Normal View History

2023-01-20 00:04:51 +08:00
#include <gst/gst.h>
int main (int argc, char *argv[])
{
GstElement *pipeline, *source, *sink;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
/* Initialize */
gst_init(&argc,&argv);
/* Create the elements */
source = gst_element_factory_make("videotestsrc","source");
sink = gst_element_factory_make("autovideosink","sink");
/* Create the empty pipeline */
pipeline = gst_pipeline_new("test-pipeline");
if(!pipeline || !source || !sink)
{
g_printerr("Not all elements could be created!\n");
return -1;
}
/* Build the pipeline */
gst_bin_add_many(GST_BIN(pipeline),source,sink,NULL);
if (gst_element_link(source,sink) != TRUE)
{
g_printerr("Elements could not be linked.!\n");
gst_object_unref(pipeline);
return -1;
}
/* Modify the source's properties */
g_object_set(source, "pattern", 0 , NULL);
/* 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;
}
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
if (msg != NULL)
{
GError *err;
gchar *debug_info;
switch (GST_MESSAGE_TYPE(msg))
{
case GST_MESSAGE_ERROR:
gst_message_parse_error(msg, &err, &debug_info);
g_printerr("Error received from element %s:%s\n",GST_OBJECT_NAME(msg->src),err->message);
g_printerr("Debugging information: %s\n",debug_info ? debug_info : "none");
g_clear_error(&err);
g_free(debug_info);
break;
case GST_MESSAGE_EOS:
g_print("End-of_Stream reached.\n");
break;
default:
g_printerr("Unexpected message recevied.\n");
break;
}
gst_message_unref(msg);
}
/* Free resources */
gst_object_unref(bus);
gst_element_set_state(pipeline, GST_STATE_NULL);
gst_object_unref(pipeline);
return 0;
}