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//
// Application.cs: Framework initialization for GStreamer
//
// Authors:
// Aaron Bockover (abockover@novell.com)
// Alp Toker (alp@atoker.com)
//
// Copyright (C) 2002 Alp Toker
// Copyright (C) 2006 Novell, Inc.
// Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
//
using System;
using System.Reflection;
using System.IO;
using System.Runtime.InteropServices;
using System.Collections.Generic;
namespace Gst {
[AttributeUsage (AttributeTargets.Enum | AttributeTargets.Class | AttributeTargets.Struct) ]
public sealed class GTypeNameAttribute : Attribute {
string type_name;
public GTypeNameAttribute (string gtype_name) {
this.type_name = gtype_name;
}
public string TypeName {
get {
return type_name;
} set {
type_name = value;
}
}
}
public static class Application {
public static void Init() {
IntPtr argv = new IntPtr (0);
int argc = 0;
gst_init (ref argc, ref argv);
gst_controller_init (ref argc, ref argv);
gst_pb_utils_init ();
RegisterManagedTypes ();
}
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 Dictionary<int,bool> AssemblyTypesInCache = new Dictionary<int,bool> ();
private static Dictionary<string,Type> TypeCache = new Dictionary<string,Type> ();
// Recursively check for types with GTypeNameAttribute and put them in TypeCache,
// but only if gstreamer-sharp is in the chain of referenced assemblies.
private static void PutAssemblyTypesInCache (Assembly asm)
{
// If already visited, return immediately
if (AssemblyTypesInCache.ContainsKey(asm.GetHashCode ()))
return;
// Add with false to avoid chasing circular dependencies
AssemblyTypesInCache.Add (asm.GetHashCode (), false);
// Result is true for gstreamer-sharp or if a referenced assembly results in true
bool result = asm.GetName().Name.Equals("gstreamer-sharp");
foreach (AssemblyName ref_name in asm.GetReferencedAssemblies ()) {
try {
Assembly ref_asm = Assembly.Load (ref_name);
PutAssemblyTypesInCache (ref_asm);
result = result | AssemblyTypesInCache[ref_asm.GetHashCode ()];
} catch {
/* Failure to load a referenced assembly is not an error */
}
}
// Add types with GTypeNameAttribute in TypeCache
if (result) {
AssemblyTypesInCache[asm.GetHashCode ()] = true;
Type[] ts;
try {
ts = asm.GetTypes ();
} catch (ReflectionTypeLoadException e) {
ts = e.Types;
}
foreach (Type t in ts) {
if (t != null && t.IsDefined (typeof (GTypeNameAttribute), false)) {
GTypeNameAttribute gattr = (GTypeNameAttribute) Attribute.GetCustomAttribute (t, typeof (GTypeNameAttribute), false);
TypeCache[gattr.TypeName] = t;
}
}
}
}
private static System.Type GstResolveType (Gst.GLib.GType gtype, string gtype_name) {
// Make sure all currently loaded assemblies are in the TypeCache
System.Array.ForEach((Assembly[]) AppDomain.CurrentDomain.GetAssemblies ().Clone (), Application.PutAssemblyTypesInCache);
// Return the managed type
if (TypeCache.ContainsKey (gtype_name))
return TypeCache[gtype_name];
return null;
}
private static void RegisterManagedTypes() {
// Load types in TypeCache to speed up later invocations of GstResolveType
System.Array.ForEach((Assembly[]) AppDomain.CurrentDomain.GetAssemblies ().Clone (), Application.PutAssemblyTypesInCache);
Gst.GLib.GType.ResolveType += GstResolveType;
Gst.GLib.GType.Register (Fraction.GType, typeof (Fraction));
Gst.GLib.GType.Register (IntRange.GType, typeof (IntRange));
Gst.GLib.GType.Register (DoubleRange.GType, typeof (DoubleRange));
Gst.GLib.GType.Register (FractionRange.GType, typeof (FractionRange));
Gst.GLib.GType.Register (Fourcc.GType, typeof (Fourcc));
Gst.GLib.GType.Register (Date.GType, typeof (Date));
Gst.GLib.GType.Register (List.GType, typeof (List));
Gst.GLib.GType.Register (Array.GType, typeof (Array));
Gst.GLib.GType.Register (Caps.GType, typeof (Caps));
Gst.GLib.GType.Register (Structure.GType, typeof (Structure));
Gst.GLib.GType.Register (TagList.GType, typeof (TagList));
Gst.GLib.GType.Register (MiniObject.GType, typeof (MiniObject));
Gst.GLib.GType.Register (Bus.GType, typeof (Bus));
Gst.GLib.GType.Register (Pad.GType, typeof (Pad));
Gst.GLib.GType.Register (GhostPad.GType, typeof (GhostPad));
Gst.GLib.GType.Register (Message.GType, typeof (Message));
Gst.GLib.GType.Register (SystemClock.GType, typeof (SystemClock));
GtkSharp.GstreamerSharp.ObjectManager.Initialize ();
}
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);
Gst.GLib.Argv argv = new Gst.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 Gst.GLib.GException (error_ptr);
} else if (!result) {
throw new ApplicationException ("gst_init_check() failed: Reason unknown");
}
} 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");
}
gst_controller_init (ref argc, ref argv_ptr);
gst_pb_utils_init ();
if (argc <= 1) {
args = new string[0];
} else {
progargs = argv.GetArgs (argc);
args = new string[argc - 1];
System.Array.Copy (progargs, 1, args, 0, argc - 1);
}
RegisterManagedTypes ();
}
[DllImport ("libgstreamer-0.10.dll") ]
private static extern void gst_init (ref int argc, ref IntPtr argv);
[DllImport ("libgstreamer-0.10.dll") ]
private static extern bool gst_init_check (ref int argc, ref IntPtr argv, out IntPtr error);
[DllImport ("libgstcontroller-0.10.dll") ]
private static extern void gst_controller_init (ref int argc, ref IntPtr argv);
[DllImport ("libgstpbutils-0.10.dll") ]
private static extern void gst_pb_utils_init ();
[DllImport ("libgstreamer-0.10.dll") ]
private static extern void gst_deinit();
}
}
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