gstreamer/gstreamer-sharp/Application.cs

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//
// Application.cs: Framework initialization for GStreamer
//
// Authors:
// Aaron Bockover (abockover@novell.com)
// Alp Toker (alp@atoker.com)
//
// (C) 2006 Novell, Inc.
// (C) 2002 Alp Toker
//
using System;
using System.Runtime.InteropServices;
namespace Gst
{
public static class Application
{
public static void Init()
{
IntPtr argv = new IntPtr(0);
int argc = 0;
gst_init(ref argc, ref argv);
}
public static void Init(string progname, ref string [] args)
{
FullInit(progname, ref args, false);
}
public static void InitCheck(string progname, ref string [] args)
{
FullInit(progname, ref args, true);
}
public static void Deinit()
{
gst_deinit();
}
private static void FullInit(string progname, ref string [] args, bool check)
{
string [] progargs = new string[args.Length + 1];
progargs[0] = progname;
args.CopyTo(progargs, 1);
GLib.Argv argv = new GLib.Argv(progargs);
IntPtr argv_ptr = argv.Handle;
int argc = progargs.Length;
if(check) {
IntPtr error_ptr;
bool result = gst_init_check(ref argc, ref argv_ptr, out error_ptr);
if(error_ptr != IntPtr.Zero) {
throw new ApplicationException("gst_init_check set error");
} else if(!result) {
throw new ApplicationException("gst_init_check failed, error not set");
}
} else {
gst_init(ref argc, ref argv_ptr);
}
if(argv_ptr != argv.Handle) {
string init_call = check ? "gst_init_check" : "gst_init";
throw new ApplicationException(init_call + " returned a new argv handle");
}
if(argc <= 1) {
args = new string[0];
} else {
progargs = argv.GetArgs(argc);
args = new string[argc - 1];
Array.Copy(progargs, 1, args, 0, argc - 1);
}
}
private static Version version = null;
public static Version Version {
get {
if(version == null) {
version = new Version();
}
return version;
}
}
[DllImport("gstreamer-0.10")]
private static extern void gst_init(ref int argc, ref IntPtr argv);
[DllImport("gstreamer-0.10")]
private static extern bool gst_init_check(ref int argc, ref IntPtr argv, out IntPtr error);
[DllImport("gstreamer-0.10")]
private static extern void gst_deinit();
}
}