From 5097ae8adc2f7e973e483a70f74d2912cf054f95 Mon Sep 17 00:00:00 2001
From: Khaled Mohammed <khaled.mohammed@gmail.com>
Date: Tue, 29 Aug 2006 07:28:18 +0000
Subject: [PATCH] Added a new sample - sample/MetaData.cs

git-svn-id: svn://anonsvn.mono-project.com/source/branches/abock/gstreamer-sharp@64506 e3ebcda4-bce8-0310-ba0a-eca2169e7518
---
 ChangeLog          |   4 ++
 sample/Makefile.am |   3 +
 sample/MetaData.cs | 153 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 160 insertions(+)
 create mode 100644 sample/MetaData.cs

diff --git a/ChangeLog b/ChangeLog
index 4d6b269c4a..36e64f589c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-08-29  Khaled Mohammed <khaled.mohammed@gmail.com>
+	* sample/MetaData.cs: a sample file which extracts tag information
+	from media files and displays them to console.
+
 2006-08-25  Khaled Mohammed <khaled.mohammed@gmail.com>
 	* sample/QueueExample.cs: a sample file showcasing 
 	use of the queue element
diff --git a/sample/Makefile.am b/sample/Makefile.am
index a0c729d5fe..d968ff6858 100644
--- a/sample/Makefile.am
+++ b/sample/Makefile.am
@@ -22,6 +22,9 @@ typefind.exe: $(srcdir)/TypeFind.cs $(assemblies)
 queueexample.exe: $(srcdir)/QueueExample.cs $(assemblies)
 	$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/QueueExample.cs
 
+metadata.exe: $(srcdir)/MetaData.cs $(assemblies)
+	$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/MetaData.cs
+
 link:
 	ln -sf $(top_builddir)/gstreamer-sharp/gstreamer-sharp.dll gstreamer-sharp.dll
 	ln -sf $(top_builddir)/gstreamer-sharp/gstreamer-sharp.dll.config gstreamer-sharp.dll.config
diff --git a/sample/MetaData.cs b/sample/MetaData.cs
new file mode 100644
index 0000000000..8931222773
--- /dev/null
+++ b/sample/MetaData.cs
@@ -0,0 +1,153 @@
+//
+// Authors
+//   Khaled Mohammed (khaled.mohammed@gmail.com)
+//
+// (C) 2006
+//
+
+using Gst;
+using System;
+
+public class MetaData 
+{
+
+	static Element pipeline = null;
+	static Element source = null;
+
+	static void PrintTag( TagList list, string tag) {
+		uint count = list.GetTagSize(tag);
+
+		for(uint i =0; i < count; i++) 
+		{
+			string str;
+			if(Tag.GetGType(tag) == GLib.GType.String) {
+				if(!list.GetStringIndex(tag, i, out str))
+					Console.Error.WriteLine("g_assert_not_reached()???");
+			} else {
+				str = (String) list.GetValueIndex(tag, i).Val; 
+			}
+
+			if(i == 0) 
+				Console.WriteLine("{0}:\t {1}", Tag.GetNick(tag), str);
+			else
+				Console.WriteLine("\t{0}", str);
+		}
+	}
+
+	static bool MessageLoop(Element element, TagList tags) 
+	{
+		Bus bus = element.Bus;
+		bool done = false;
+
+		while(!done) {
+			Message message = bus.Pop();
+			if(message == null)
+				break;
+
+			switch(message.Type) {
+				case MessageType.Error:
+					message.Dispose();
+					return true;
+				case MessageType.Eos:
+					message.Dispose();
+					return true;
+				case MessageType.Tag: {
+					TagList new_tags = new TagList();
+					message.ParseTag(new_tags);
+					if(tags != null) {
+						tags = tags.Merge(new_tags, TagMergeMode.KeepAll);
+					}
+					else {
+						tags = new_tags;
+					}
+					new_tags.Dispose();
+					break;
+				}
+				default:
+					break;
+			}	
+			message.Dispose();
+		}
+		bus.Dispose();
+		return true;
+	}
+
+	static void MakePipeline() 
+	{
+		Element decodebin;
+
+		if(pipeline != null) {
+			pipeline.Dispose();
+		}
+		
+		pipeline = new Pipeline(String.Empty);
+		source = ElementFactory.Make("filesrc", "source");
+		decodebin = ElementFactory.Make("decodebin", "decodebin");
+
+		Bin bin = (Bin) pipeline;
+		bin.AddMany(source, decodebin);
+		source.Link(decodebin);
+		decodebin.Dispose();
+	}
+
+	public static void Main(string [] args) 
+	{
+		Application.Init();
+
+		if(args.Length < 1) 
+		{
+			Console.Error.WriteLine("Please give filenames to read metadata from\n\n");
+			return;
+		}
+
+		MakePipeline();		
+
+		int i=-1;
+		while(++i < args.Length)
+		{
+			State state, pending;
+			TagList tags = null;
+
+			string filename = args[i];
+			source.SetProperty("location", filename);
+
+			StateChangeReturn sret = pipeline.SetState(State.Paused);
+
+			if(sret == StateChangeReturn.Async) {
+				if(StateChangeReturn.Success != pipeline.GetState(out state, out pending, Clock.Second * 5)) {
+					Console.Error.WriteLine("State change failed for {0}. Aborting\n", filename);
+					break;
+				}
+			} else if(sret != StateChangeReturn.Success) {
+				Console.Error.WriteLine("{0} - Could not read file\n", filename);
+				continue;
+			}
+
+			if(!MessageLoop(pipeline, tags)) {
+				Console.Error.WriteLine("Failed in message reading for {0}", args[i]);
+			}
+
+			if(tags != null) {
+				Console.WriteLine("Metadata for {0}:", args[i]);
+				tags.Foreach(PrintTag);
+				tags.Dispose();
+				tags = null;
+			} else Console.Error.WriteLine("No metadata found for {0}", args[0]);
+
+			sret = pipeline.SetState(State.Null);
+
+			if(StateChangeReturn.Async == sret) {
+				if(StateChangeReturn.Failure == pipeline.GetState(out state, out pending, Clock.TimeNone)) {
+					Console.Error.WriteLine("State change failed. Aborting");
+				}
+			}
+		}
+
+		if(pipeline != null) 
+		{
+			pipeline.Dispose();
+		}
+
+	}
+}
+