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Custom Signal Handler for Element.cs
git-svn-id: svn://anonsvn.mono-project.com/source/branches/abock/gstreamer-sharp@61891 e3ebcda4-bce8-0310-ba0a-eca2169e7518
This commit is contained in:
Khaled Mohammed
parent
5c14766d47
commit
d09ded2065
8 changed files with 208 additions and 5 deletions
19
ChangeLog
19
ChangeLog
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@ -1,9 +1,24 @@
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2006-06-21 Khaled Mohammed <khaled.mohammed@gmail.com>
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* gstreamer-sharp/DynamicSignalHandlerGenerator.cs: This class is
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reponsible for generating a custom delegate class which supports
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variable number of parameters.
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* gstreamer-sharp/DyanmicSignalMarshalHandler.cs: This is an abstract
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class and is derived by the new type generated by the Generator.
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This class makes it easy for me to work with the new type.
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* gstreamer-sharp/Element.custom: Added functions to add a custom signal,
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a function which marshall's the signal parameters.
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* sample/HelloWorld.cs: Added a sample to show the usuage of a custom signal.
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2006-06-04 Khaled Mohammed <khaled.mohammed@gmail.com>
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* gstreamer/glue/Bin.c: added this file to the source. It has only one
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* gstreamer-sharp/glue/Bin.c: added this file to the source. It has only one
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function which gives offset of *children in the C struct.
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* gstreamer/glue/Makefile.am: added Bin.c to the list of C source that
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* gstreamer-sharp/glue/Makefile.am: added Bin.c to the list of C source that
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must be compiled.
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* tests/ElementTest.cs: added NUnit tests for Element class.
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@ -23,6 +23,17 @@
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}
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}
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[DllImport("gstreamer-0.10.dll")]
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static extern bool gst_bin_add(IntPtr raw, IntPtr element);
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public bool Add(Gst.Element element) {
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// if(element !=null)
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// element.Refcount++;
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bool raw_ret = gst_bin_add(Handle, element == null ? IntPtr.Zero : element.Handle);
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bool ret = raw_ret;
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return ret;
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}
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public bool AddMany(params Element[] elements)
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{
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if(elements == null) {
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@ -37,3 +48,6 @@
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return true;
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}
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112
gstreamer-sharp/DynamicSignalHandlerGenerator.cs
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112
gstreamer-sharp/DynamicSignalHandlerGenerator.cs
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@ -0,0 +1,112 @@
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//
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// Authors
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// Khaled Mohammed < Khaled.Mohammed@gmail.com >
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//
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// (C) 2006 Novell
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//
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using System;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Runtime.InteropServices;
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namespace Gst {
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public class DynamicSignalHandlerGenerator {
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Type _NewType;
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public Type NewType {
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get { return _NewType; }
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set { _NewType = value; }
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}
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public DynamicSignalHandlerGenerator(Type [] eventParams, string ASSEMBLY_NAME, string classname) {
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// Define the parameters of marshall handler
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Type [] paramTypes = new Type[eventParams.Length + 1];
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for(int i=0; i < paramTypes.Length; i++)
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paramTypes[i] = typeof(IntPtr);
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Type [] paramBeginInvokeTypes = new Type[eventParams.Length + 2];
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for(int i=0; i < paramBeginInvokeTypes.Length - 2 ; i++)
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paramBeginInvokeTypes[i] = typeof(IntPtr);
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paramBeginInvokeTypes[paramBeginInvokeTypes.Length - 2] = typeof(System.AsyncCallback);
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paramBeginInvokeTypes[paramBeginInvokeTypes.Length - 1] = typeof(object);
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// defining the assembly
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AssemblyName dynamic_assembly_name = new AssemblyName();
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dynamic_assembly_name.Name = ASSEMBLY_NAME;
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AssemblyBuilder dynamic_assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(
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dynamic_assembly_name, AssemblyBuilderAccess.RunAndSave);
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// create the dll file in the memory
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ModuleBuilder dynamic_module = dynamic_assembly.DefineDynamicModule(ASSEMBLY_NAME, ASSEMBLY_NAME + ".dll");
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TypeBuilder dynamic_class = dynamic_module.DefineType(ASSEMBLY_NAME + "." + classname, TypeAttributes.Public, typeof(Gst.DynamicSignalMarshalHandler));
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MethodBuilder method_CSCB = dynamic_class.DefineMethod("CustomSignalCallback", MethodAttributes.Public | MethodAttributes.HideBySig, typeof(void), paramTypes );
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ILGenerator method_IL = method_CSCB.GetILGenerator();
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method_IL.Emit(OpCodes.Ldc_I4, paramTypes.Length);
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method_IL.Emit(OpCodes.Newarr, typeof(IntPtr));
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for(int i=0; i < paramTypes.Length; i++) {
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method_IL.Emit(OpCodes.Dup);
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method_IL.Emit(OpCodes.Ldc_I4, i);
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method_IL.Emit(OpCodes.Ldelema, typeof(IntPtr));
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method_IL.Emit(OpCodes.Ldarg, i+1);
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method_IL.Emit(OpCodes.Stobj, typeof(IntPtr));
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}
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method_IL.Emit(OpCodes.Call, typeof(Gst.Element).GetMethod("CustomMarshaller"));
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method_IL.Emit(OpCodes.Ret);
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// define delegate
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TypeBuilder tbDelegate = dynamic_class.DefineNestedType("CustomSignalDelegate", TypeAttributes.NestedPublic | TypeAttributes.Sealed, typeof(MulticastDelegate), null);
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// CustomSignalDelegate()
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ConstructorBuilder constructor = tbDelegate.DefineConstructor(MethodAttributes.Public | MethodAttributes.RTSpecialName | MethodAttributes.SpecialName | MethodAttributes.HideBySig, CallingConventions.Standard, new Type [] { typeof(object), typeof(IntPtr) });
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constructor.SetImplementationFlags (MethodImplAttributes.Runtime);
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//constructor_IL = constructor.GetILGenerator();
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//constructor_IL.Emit(OpCodes.Ret);
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MethodBuilder method = tbDelegate.DefineMethod("Invoke", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig , typeof(void), paramTypes);
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method.SetImplementationFlags (MethodImplAttributes.Runtime);
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// .method public virtual hidebysig newslot
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// instance default class [mscorlib]System.IAsyncResult BeginInvoke (native int arg0, native int arg1, native int gch, // class [mscorlib]System.AsyncCallback callback, object 'object') runtime managed
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method = tbDelegate.DefineMethod("BeginInvoke", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot, typeof(System.IAsyncResult), paramBeginInvokeTypes);
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method.SetImplementationFlags(MethodImplAttributes.Runtime);
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// .method public virtual hidebysig newslot
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// instance default void EndInvoke (class [mscorlib]System.IAsyncResult result) runtime managed
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method = tbDelegate.DefineMethod("EndInvoke", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Virtual, typeof(void), new Type [] { typeof(System.IAsyncResult) });
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method.SetImplementationFlags(MethodImplAttributes.Runtime);
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// .method public virtual hidebysig
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// instance default class [mscorlib]System.Delegate Func () cil managed
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method = dynamic_class.DefineMethod("Func", MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig , typeof(Delegate), null);
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method_IL = method.GetILGenerator();
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method_IL.Emit(OpCodes.Ldarg_0);
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method_IL.Emit(OpCodes.Ldftn, method_CSCB);
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method_IL.Emit(OpCodes.Newobj, constructor);
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method_IL.Emit(OpCodes.Ret);
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_NewType = dynamic_class.CreateType();
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dynamic_assembly.Save(ASSEMBLY_NAME + ".dll");
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}
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}
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}
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14
gstreamer-sharp/DynamicSignalMarshalHandler.cs
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14
gstreamer-sharp/DynamicSignalMarshalHandler.cs
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@ -0,0 +1,14 @@
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//
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// Authors
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// Khaled Mohammed < Khaled.Mohammed@gmail.com >
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//
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// (C) 2006 Novell
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//
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using System;
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namespace Gst {
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public abstract class DynamicSignalMarshalHandler {
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public abstract Delegate Func();
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}
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}
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@ -42,3 +42,43 @@
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{
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return gst_element_query_duration(Handle, ref format, out duration);
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}
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static Type [] paramTypes;
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public void AddCustomEvent(string name, Delegate onCustom ) {
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System.Reflection.ParameterInfo [] pi = onCustom.Method.GetParameters();
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paramTypes = new Type[pi.Length];
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for(int i=0; i < paramTypes.Length; i++) {
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paramTypes[i] = pi[i].ParameterType;
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}
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string DYNAMIC_ASSEMBLY = "Gst.DynamicSignals.Element." + Name + "." + name;
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string DYNAMIC_CLASS = "NewDSMH";
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DynamicSignalHandlerGenerator dshGenerator = new DynamicSignalHandlerGenerator(paramTypes, DYNAMIC_ASSEMBLY, DYNAMIC_CLASS);
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Type NewType = System.Reflection.Assembly.LoadFile(DYNAMIC_ASSEMBLY + ".dll").GetType(DYNAMIC_ASSEMBLY + "." + DYNAMIC_CLASS);
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DynamicSignalMarshalHandler dsmh = Activator.CreateInstance(NewType) as DynamicSignalMarshalHandler;
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GLib.Signal sig = GLib.Signal.Lookup (this, name, dsmh.Func());
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sig.AddDelegate(onCustom);
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}
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public static void CustomMarshaller(params IntPtr [] args) {
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GLib.Signal sig = ((GCHandle) args[args.Length - 1]).Target as GLib.Signal;
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object [] newargs = new object[args.Length - 1];
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for(int i=0; i < newargs.Length; i++) {
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if(paramTypes[i].IsSubclassOf(typeof(GLib.Object))) {
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newargs[i] = GLib.Object.GetObject(args[i]);
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}
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else if(paramTypes[i].IsSubclassOf(typeof(GLib.Opaque))) {
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newargs[i] = GLib.Opaque.GetOpaque(args[i], paramTypes[i], true);
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}
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}
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Delegate d = sig.Handler as Delegate;
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d.DynamicInvoke(newargs);
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}
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@ -5,7 +5,9 @@
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<attr path="/api/namespace/object[@name='Bin']/field[@name='Children']" name="hidden">1</attr>
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<attr path="/api/namespace/object[@name='Bin']/method[@name='Add']" name="hidden">1</attr>
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<attr path="/api/namespace/object[@name='Element']/signal[@name='NoMorePads']" name="name">HasNoMorePads</attr>
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<!-- Hidden as the parameter name conflicts with generated code -->
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@ -41,6 +41,8 @@ sources = \
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Version.cs \
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AssemblyInfo.cs \
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CommonTags.cs \
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DynamicSignalMarshalHandler.cs \
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DynamicSignalHandlerGenerator.cs \
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plugins-base/PlayBin.cs \
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plugins-base/DecodeBin.cs
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@ -1,4 +1,4 @@
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TARGETS = playbin-player.exe decodebin-transcoder.exe
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TARGETS = playbin-player.exe decodebin-transcoder.exe helloworld.exe
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DEBUGS = $(addsuffix .mdb, $(TARGETS))
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assemblies=$(top_builddir)/gstreamer-sharp/gstreamer-sharp.dll
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@ -11,6 +11,9 @@ playbin-player.exe: $(srcdir)/PlayBinPlayer.cs $(assemblies)
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decodebin-transcoder.exe: $(srcdir)/DecodeBinTranscoder.cs $(assemblies)
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$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/DecodeBinTranscoder.cs
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helloworld.exe: $(srcdir)/HelloWorld.cs $(assemblies)
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$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/HelloWorld.cs
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noinst_SCRIPTS = $(TARGETS)
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CLEANFILES = $(TARGETS) $(DEBUGS)
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@ -18,4 +21,5 @@ MAINTAINERCLEANFILES = Makefile.in
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EXTRA_DIST = \
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PlayBinPlayer.cs \
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DecodeBinTranscoder.cs
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DecodeBinTranscoder.cs \
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HelloWorld.cs
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