Creating a C++ GStreamer project in Eclipse - MDHSRobotics/TeamWiki GitHub Wiki
#Creating a C++ GStreamer project in Eclipse
This page lists out the steps necessary to set up your Eclipse environment for gstreamer c++ applications.
##1. Create a c++ Project
Create a C++ project in Eclipse using the standard approach. Set your active configuration to Release
##2. Add required include paths in your project's c++ build settings
The command pkg-config --cflags gstreamer-1.0 gives you the required dependencies and the order they need to be added in. The command returns the following.
-pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
- /usr/include/gstreamer-1.0
- /usr/include/glib-2.0
- /usr/lib/x86_64-linux-gnu/glib-2.0/include
Add -pthread as another optimization flag in the Optimization section of your C++ compiler build settings
##3. Add links to required libraries in your project's c++ build settings
The command pkg-config --libs gstreamer-1.0 gives you the required dependencies and the order they need to be added in. The command returns the following.
-lgstreamer-1.0 -lgobject-2.0 -lglib-2.0
- gstreamer-1.0
- gobject-2.0
- glib-2.0
##4. Test your set up Cut and paste the following code in your c++ program to test your set up. It should compile and run and will display a video test signal in a video player.
//============================================================================
// Name : GStreamerApplication.cpp
// Author :
// Version :
// Copyright : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================
#include <gst/gst.h>
int main(int argc, char *argv[]) {
GstElement *pipeline, *source, *sink;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
/* Initialize GStreamer */
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, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
/* Parse message */
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:
/* We should not reach here because we only asked for ERRORs and EOS */
g_printerr ("Unexpected message received.\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;
}