sample: Add playback tutorial 4 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
+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
 
 DEBUGS = $(addsuffix .mdb, $(TARGETS))
 assemblies = 					\
@@ -57,6 +57,9 @@ playback-tutorial-2.exe: $(srcdir)/PlaybackTutorial2.cs $(assemblies)
 playback-tutorial-3.exe: $(srcdir)/PlaybackTutorial3.cs $(assemblies)
 	$(CSC) $(CSFLAGS) -out:playback-tutorial-3.exe $(references) $(GLIB_SHARP_LIBS) $(srcdir)/PlaybackTutorial3.cs
 
+playback-tutorial-4.exe: $(srcdir)/PlaybackTutorial4.cs $(assemblies)
+	$(CSC) $(CSFLAGS) -out:playback-tutorial-4.exe $(references) $(GLIB_SHARP_LIBS) $(srcdir)/PlaybackTutorial4.cs
+
 EXTRA_DIST = 				\
 	Playback.cs \
     VideoOverlay.cs \
@@ -73,4 +76,5 @@ EXTRA_DIST = 				\
     BasicTutorial13.cs \
     PlaybackTutorial1.cs \
     PlaybackTutorial2.cs \
-    PlaybackTutorial3.cs
+    PlaybackTutorial3.cs \
+    PlaybackTutorial4.cs

samples/PlaybackTutorial4.cs

@@ -0,0 +1,147 @@
+// Authors
+//   Copyright (C) 2014 Stephan Sundermann <stephansundermann@gmail.com>
+
+using System;
+using Gst;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace GstreamerSharp
+{
+	class Playback
+	{
+		const int GraphLength = 78;
+		static uint PlayFlagDownload = (1 << 7); // Enable progressive download (on selected formats)
+
+		static bool IsLive;
+		static Element Pipeline;
+		static GLib.MainLoop MainLoop;
+		static int BufferingLevel;
+
+		static void GotLocation (object sender, GLib.SignalArgs args) {
+			var propObject = (Gst.Object)args.Args [0];
+			var location = (string) propObject["temp-location"];
+			Console.WriteLine ("Temporary file: {0}", location);
+			// Uncomment this line to keep the temporary file after the program exits
+			// g_object_set (G_OBJECT (prop_object), "temp-remove", FALSE, NULL);
+		}
+
+		public static void Main (string[] args)
+		{
+			// Initialize GStreamer
+			Application.Init (ref args);
+			BufferingLevel = 100;
+
+			// Build the pipeline
+			Pipeline = Parse.Launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm");
+			var bus = Pipeline.Bus;
+
+			// Set the download flag
+			var flags = (uint)Pipeline ["flags"];
+			flags |= PlayFlagDownload;
+			Pipeline ["flags"] = flags;
+
+			// Uncomment this line to limit the amount of downloaded data
+			// g_object_set (pipeline, "ring-buffer-max-size", (guint64)4000000, NULL);
+
+			// Start playing
+			var ret = Pipeline.SetState (State.Playing);
+			if (ret == StateChangeReturn.Failure) {
+				Console.WriteLine ("Unable to set the pipeline to the playing state.");
+				return;
+			} else if (ret == StateChangeReturn.NoPreroll) {
+				IsLive = true;
+			}
+
+			MainLoop = new GLib.MainLoop ();
+
+			bus.AddSignalWatch ();
+			bus.Message += HandleMessage;
+			Pipeline.Connect ("deep-notify::temp-location", GotLocation);
+
+			// Register a function that GLib will call every second
+			GLib.Timeout.AddSeconds (1, RefreshUI);
+
+			MainLoop.Run ();
+
+			// Free resources
+			Pipeline.SetState (State.Null);
+		}
+
+		static void HandleMessage (object o, MessageArgs args)
+		{
+			var msg = args.Message;
+			switch (msg.Type) {
+			case MessageType.Error: {
+					GLib.GException err;
+					string debug;
+
+					msg.ParseError (out err, out debug);
+					Console.WriteLine ("Error: {0}", err.Message);
+
+					Pipeline.SetState (State.Ready);
+					MainLoop.Quit ();
+					break;
+				}
+			case MessageType.Eos:
+				// end-of-stream
+				Pipeline.SetState (State.Ready);
+				MainLoop.Quit ();
+				break;
+			case MessageType.Buffering: {
+					int percent = 0;
+
+					// If the stream is live, we do not care about buffering.
+					if (IsLive) break;
+
+					percent = msg.ParseBuffering ();
+					// Wait until buffering is complete before start/resume playing
+					if (percent < 100)
+						Pipeline.SetState (State.Paused);
+					else
+						Pipeline.SetState (State.Playing);
+					break;
+				}
+			case MessageType.ClockLost:
+				// Get a new clock
+				Pipeline.SetState (State.Paused);
+				Pipeline.SetState (State.Playing);
+				break;
+			default:
+				// Unhandled message
+				break;
+			}
+		}
+
+		static bool RefreshUI () {
+			var query = new Query (Format.Percent);
+			if (Pipeline.Query (query)) {
+				var graph = new StringBuilder (GraphLength);
+				long position = 0, duration = 0;
+
+				var nRanges = query.NBufferingRanges;
+				for (uint range = 0; range < nRanges; range++) {
+					long start, stop;
+					query.ParseNthBufferingRange (range, out start, out stop);
+					start = start * GraphLength / (stop - start);
+					stop = stop * GraphLength / (stop - start);
+					for (int i = (int)start; i < stop; i++)
+						graph.Insert (i, '-');
+				}
+				if (Pipeline.QueryPosition (Format.Time, out position) && position >= 0
+					&& Pipeline.QueryDuration (Format.Time, out duration) && duration >= 0) {
+					var i = (int)(GraphLength * (double)position / (double)(duration + 1));
+					graph [i] = BufferingLevel < 100 ? 'X' : '>';
+				}
+				Console.WriteLine ("[{0}]", graph);
+				if (BufferingLevel < 100) {
+					Console.WriteLine (" Buffering: {0}", BufferingLevel);
+				} else {
+					Console.WriteLine ("                ");
+				}
+				Console.WriteLine ();
+			}
+			return true;
+		}
+	}
+}