sample: Add playback tutorial 5 sample

samples/Makefile.am

@@ -1,4 +1,4 @@
-TARGETS = playback.exe video-overlay.exe basic-tutorial-1.exe basic-tutorial-2.exe basic-tutorial-3.exe basic-tutorial-4.exe basic-tutorial-5.exe basic-tutorial-6.exe basic-tutorial-7.exe basic-tutorial-8.exe basic-tutorial-9.exe basic-tutorial-12.exe basic-tutorial-13.exe playback-tutorial-1.exe playback-tutorial-2.exe playback-tutorial-3.exe playback-tutorial-4.exe
+TARGETS = playback.exe video-overlay.exe basic-tutorial-1.exe basic-tutorial-2.exe basic-tutorial-3.exe basic-tutorial-4.exe basic-tutorial-5.exe basic-tutorial-6.exe basic-tutorial-7.exe basic-tutorial-8.exe basic-tutorial-9.exe basic-tutorial-12.exe basic-tutorial-13.exe playback-tutorial-1.exe playback-tutorial-2.exe playback-tutorial-3.exe playback-tutorial-4.exe playback-tutorial-5.exe
 
 DEBUGS = $(addsuffix .mdb, $(TARGETS))
 assemblies = 					\
@@ -60,6 +60,9 @@ playback-tutorial-3.exe: $(srcdir)/PlaybackTutorial3.cs $(assemblies)
 playback-tutorial-4.exe: $(srcdir)/PlaybackTutorial4.cs $(assemblies)
 	$(CSC) $(CSFLAGS) -out:playback-tutorial-4.exe $(references) $(GLIB_SHARP_LIBS) $(srcdir)/PlaybackTutorial4.cs
 
+playback-tutorial-5.exe: $(srcdir)/PlaybackTutorial5.cs $(assemblies)
+	$(CSC) $(CSFLAGS) -out:playback-tutorial-5.exe $(references) $(GLIB_SHARP_LIBS) $(srcdir)/PlaybackTutorial5.cs
+
 EXTRA_DIST = 				\
 	Playback.cs \
     VideoOverlay.cs \
@@ -77,4 +80,5 @@ EXTRA_DIST = 				\
     PlaybackTutorial1.cs \
     PlaybackTutorial2.cs \
     PlaybackTutorial3.cs \
-    PlaybackTutorial4.cs
+    PlaybackTutorial4.cs \
+    PlaybackTutorial5.cs

samples/PlaybackTutorial5.cs

@@ -0,0 +1,126 @@
+// Authors
+//   Copyright (C) 2014 Stephan Sundermann <stephansundermann@gmail.com>
+
+using System;
+using Gst;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace GstreamerSharp
+{
+	class Playback
+	{
+		static Element Pipeline;
+		static GLib.MainLoop MainLoop;
+
+		// Process a color balance command
+		static void UpdateColorChannel (string channelName, bool increase, Gst.Video.IColorBalance cb) {
+
+			// Retrieve the list of channels and locate the requested one
+			var channels = cb.ListChannels ();
+			Gst.Video.ColorBalanceChannel channel = null;
+			foreach (var ch in channels) {
+				var label = ch.Label;
+
+				if (label.Contains (channelName)) {
+					channel = ch;
+					break;
+				}
+			}
+			if (channel == null)
+				return;
+
+			// Change the channel's value
+			var step = 0.1 * (channel.MaxValue - channel.MinValue);
+			var value = cb.GetValue (channel);
+			if (increase) {
+				value = (int)(value + step);
+				if (value > channel.MaxValue)
+					value = channel.MaxValue;
+			} else {
+				value = (int)(value - step);
+				if (value < channel.MinValue)
+					value = channel.MinValue;
+			}
+			cb.SetValue (channel, value);
+		}
+
+		// Process keyboard input
+		static bool HandleKeyboard () {
+			if (Console.KeyAvailable) {
+				var key = Console.ReadKey (false);
+				var cb = new Gst.Video.ColorBalanceAdapter (Pipeline.Handle);
+
+				switch (key.Key) {
+				case ConsoleKey.C:
+					UpdateColorChannel ("CONTRAST", key.Modifiers == ConsoleModifiers.Shift, cb);
+					break;
+				case ConsoleKey.B:
+					UpdateColorChannel ("BRIGHTNESS", key.Modifiers == ConsoleModifiers.Shift, cb);
+					break;
+				case ConsoleKey.H:
+					UpdateColorChannel ("HUE", key.Modifiers == ConsoleModifiers.Shift, cb);
+					break;
+				case ConsoleKey.S:
+					UpdateColorChannel ("SATURATION", key.Modifiers == ConsoleModifiers.Shift, cb);
+					break;
+				case ConsoleKey.Q:
+					MainLoop.Quit ();
+					break;
+				}
+				PrintCurrentValues ();
+			}
+			return true;
+		}
+
+
+		// Output the current values of all Color Balance channels
+		static void PrintCurrentValues () {
+			// Output Color Balance value
+			var cb = new Gst.Video.ColorBalanceAdapter (Pipeline.Handle);
+			var channels = cb.ListChannels ();
+
+			foreach (var ch in channels) {
+				var value = cb.GetValue (ch);
+				Console.WriteLine ("{0}: {1}", ch.Label, 100 * (value - ch.MinValue) / (ch.MaxValue - ch.MinValue));
+			}
+			Console.WriteLine ();
+		}
+
+		public static void Main (string[] args)
+		{
+			// Initialize GStreamer
+			Application.Init (ref args);
+			GtkSharp.GstreamerSharp.ObjectManager.Initialize ();
+
+			// Print usage map 
+			Console.WriteLine ("USAGE: Choose one of the following options, then press enter:");
+			Console.WriteLine (" 'C' to increase contrast, 'c' to decrease contrast");
+			Console.WriteLine (" 'B' to increase brightness, 'b' to decrease brightness");
+			Console.WriteLine (" 'H' to increase hue, 'h' to decrease hue");
+			Console.WriteLine (" 'S' to increase saturation, 's' to decrease saturation");
+			Console.WriteLine (" 'Q' to quit");
+
+			// Build the pipeline 
+			Pipeline = Parse.Launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm");
+
+			// Add a keyboard watch so we get notified of keystrokes 
+
+			// Start playing 
+			var ret = Pipeline.SetState (State.Playing);
+			if (ret == StateChangeReturn.Failure) {
+				Console.WriteLine ("Unable to set the pipeline to the playing state.");
+				return;
+			}
+			PrintCurrentValues ();
+
+			// Create a GLib Main Loop and set it to run 
+			MainLoop = new GLib.MainLoop ();
+			GLib.Timeout.Add (50, HandleKeyboard);
+			MainLoop.Run ();
+
+			// Free resources 
+			Pipeline.SetState (State.Null);
+		}
+	}
+}