From 7698ae88012ce8b8693a3e4d22f15cd62b71db5d Mon Sep 17 00:00:00 2001
From: Maarten Bosmans <mkbosmans@gmail.com>
Date: Sat, 20 Jun 2009 22:55:27 +0200
Subject: [PATCH] Add samples/AppSrc.cs

This sample started as a test case for a bug with Buffer.Data, but remains
useful as a example of how to use the AppSrc element.
---
 samples/AppSrc.cs   | 103 ++++++++++++++++++++++++++++++++++++++++++++
 samples/Makefile.am |   5 ++-
 2 files changed, 107 insertions(+), 1 deletion(-)
 create mode 100644 samples/AppSrc.cs

diff --git a/samples/AppSrc.cs b/samples/AppSrc.cs
new file mode 100644
index 0000000000..eebefd7353
--- /dev/null
+++ b/samples/AppSrc.cs
@@ -0,0 +1,103 @@
+/*
+ * AppSrc.cs: example of using the appsrc element
+ *
+ * Authors:
+ *   Maarten Bosmans <mkbosmans@gmail.com>
+ *
+ * Copyright (C) 2009 Maarten Bosmans
+ *
+ */
+
+using System;
+using System.Runtime.InteropServices;
+using GLib;
+using Gst;
+using Cairo;
+
+public class AppSrcDemo
+{
+	static MainLoop loop;
+	static Gst.App.AppSrc appsrc;
+  static Pipeline pipeline;
+
+	public static void Main (string[] args)
+	{
+		Application.Init();
+		loop = new MainLoop();
+
+		// Construct all the elements
+		pipeline = new Pipeline();
+		appsrc = new Gst.App.AppSrc("AppSrcDemo");
+		Element color = ElementFactory.Make("ffmpegcolorspace");
+		Element sink = ElementFactory.Make("autovideosink");
+
+		// Link the elements
+		pipeline.Add(appsrc, color, sink);
+		Element.Link(appsrc, color, sink);
+
+		// Set the caps on the AppSrc to RGBA, 640x480, 4 fps, square pixels
+		appsrc.Caps = Gst.Video.VideoUtil.FormatNewCaps(Gst.Video.VideoFormat.BGRA, 640, 480, 4, 1, 1, 1);
+
+		// Connect the handlers
+		GLib.Signal.Lookup(appsrc, "need-data").AddDelegate(new EventHandler(PushAppData));
+		pipeline.Bus.AddSignalWatch();
+		pipeline.Bus.Message += MessageHandler;
+
+		// Run, loop, run!
+		pipeline.SetState(State.Playing);
+		loop.Run();
+	}
+
+	static void PushAppData(object o, EventArgs e)
+	{
+		ulong mseconds = 0;
+		if (appsrc.Clock != null)
+			mseconds = appsrc.Clock.Time / Clock.MSecond;
+		byte[] data = DrawData(mseconds);
+
+		Gst.Buffer buffer = new Gst.Buffer(data);
+		appsrc.PushBuffer(buffer);
+	}
+
+	// Returns a byte[] presentation of one 640x480 BGRA frame using Cairo
+	static byte[] DrawData(ulong seconds)
+	{
+		Cairo.ImageSurface img = new Cairo.ImageSurface(Cairo.Format.Argb32, 640, 480);
+		using(Cairo.Context context = new Cairo.Context(img))
+		{
+			double dx = (double) (seconds % 2180) / 5;
+			context.Color = new Color(1.0, 1.0, 0);
+			context.Paint();
+			context.MoveTo(300, 10 + dx);
+			context.LineTo(500 - dx, 400);
+			context.LineWidth = 4.0;
+			context.Color = new Color(0, 0, 1.0);
+			context.Stroke();
+		}
+		return img.Data;
+	}
+
+	static void MessageHandler(object sender, MessageArgs args)
+	{
+		Message message = args.Message;
+		string text = String.Format("Message from {0}:  \t{1}", message.Src.Name, message.Type);
+		switch (message.Type) {
+			case MessageType.Error:
+				Enum err;
+				string msg;
+				message.ParseError(out err, out msg);
+				text += String.Format("\t({0})", msg);
+				break;
+			case MessageType.StateChanged:
+				State oldstate, newstate, pending;
+				message.ParseStateChanged(out oldstate, out newstate, out pending);
+				text += String.Format("\t\t{0} -> {1}   ({2})", oldstate, newstate, pending);
+				break;
+			case MessageType.Eos:
+				loop.Quit();
+				break;
+		}
+		Console.WriteLine(text);
+	}
+}
+
diff --git a/samples/Makefile.am b/samples/Makefile.am
index e24ce21112..6ee67d5e2c 100644
--- a/samples/Makefile.am
+++ b/samples/Makefile.am
@@ -1,7 +1,7 @@
 if USE_MONO_COMPILER
 MCS_TARGETS = gtk-video-player.exe
 endif
-TARGETS = playbin-player.exe decodebin-transcoder.exe helloworld.exe typefind.exe metadata.exe $(MCS_TARGETS)
+TARGETS = playbin-player.exe decodebin-transcoder.exe helloworld.exe typefind.exe metadata.exe appsrc.exe $(MCS_TARGETS)
 DEBUGS = $(addsuffix .mdb, $(TARGETS))
 
 all: $(TARGETS) link
@@ -30,6 +30,9 @@ metadata.exe: $(srcdir)/MetaData.cs $(assemblies)
 mp3launchparse.exe: $(srcdir)/MP3LaunchParse.cs $(assemblies)
 	$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/MP3LaunchParse.cs
 
+appsrc.exe: $(srcdir)/AppSrc.cs $(assemblies)
+	$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) -r:Mono.Cairo.dll $(srcdir)/AppSrc.cs
+
 gtk-video-player.exe: $(srcdir)/GtkVideoPlayer.cs $(assemblies)
 	$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) -pkg:gtk-sharp-2.0 $(srcdir)/GtkVideoPlayer.cs