[mistelix] Detects if a project uses MP3 but the user has no MP3 decodec

[Jordi Mas <jmas src gnome org>]

commit a6022276061451f6a23309c239b8c28e85bd830d
Author: Jordi Mas <jmas softcatala org>
Date:   Tue Nov 2 21:30:40 2010 +0100

    Detects if a project uses MP3 but the user has no MP3 decodec

 libmistelix/mistelix.h                |    4 +-
 po/POTFILES.in                        |    1 +
 src/Backends/GStreamer/DetectMedia.cs |   56 +++++++++++++++++++++++++++++++++
 src/Backends/GStreamer/Video.cs       |    2 +-
 src/Core/Dependencies.cs              |   11 ++++++-
 src/Core/SlideShow.cs                 |   25 ++++++++++++++
 src/DataModel/Project.cs              |   19 +++++++++++
 src/Makefile.am                       |    1 +
 src/mistelix.cs                       |   18 ++++++++++
 9 files changed, 133 insertions(+), 4 deletions(-)
---
diff --git a/libmistelix/mistelix.h b/libmistelix/mistelix.h
index 40fbad2..2170287 100644
--- a/libmistelix/mistelix.h
+++ b/libmistelix/mistelix.h
@@ -57,14 +57,14 @@ unsigned int mistelix_get_plugins_count ();
 
 void mistelix_get_plugins (char *plugins[]);
 
+void mistelix_detect_media (const char* file, char* media);
+
 /* Private (not exposed) but shared within the library */
 
 void mistelix_check_init ();
 
 void mistelix_check_started ();
 
-void mistelix_detect_media (const char* file, char* media);
-
 
 
 #endif /* __MISTELIX_H__ */
diff --git a/po/POTFILES.in b/po/POTFILES.in
index e52cf2e..1873be9 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -15,6 +15,7 @@ src/Core/Dependencies.cs
 src/Core/DvdProjectBuilder.cs
 src/Core/NoneTransition.cs
 src/Core/ResolutionManager.cs
+src/Core/SlideShow.cs
 src/Core/SlideShowsProjectBuilder.cs
 src/Core/ThumbnailSizeManager.cs
 src/DataModel/AspectRatio.cs
diff --git a/src/Backends/GStreamer/DetectMedia.cs b/src/Backends/GStreamer/DetectMedia.cs
new file mode 100644
index 0000000..7ece48f
--- /dev/null
+++ b/src/Backends/GStreamer/DetectMedia.cs
@@ -0,0 +1,56 @@
+//
+// Copyright (C) 2010 Jordi Mas i Hernandez, jmas softcatala org
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System;
+using System.Text;
+using System.Runtime.InteropServices;
+using Mono.Unix;
+
+using Mistelix.Core;
+
+namespace Mistelix.Backends.GStreamer
+{
+	//
+	// GStreamer detect media functions
+	//
+	public static class DetectMedia
+	{
+		[DllImport ("libmistelix")]
+		static extern void mistelix_detect_media (string file, StringBuilder media);
+
+		static string [] extensions;
+
+		static DetectMedia ()
+		{
+
+		}
+
+		static public string GetType (string file)
+		{
+			StringBuilder media = new StringBuilder (2048);
+			mistelix_detect_media (file, media);
+
+			return media.ToString ();
+		}
+	}
+}
diff --git a/src/Backends/GStreamer/Video.cs b/src/Backends/GStreamer/Video.cs
index 4d33f04..c7db06d 100644
--- a/src/Backends/GStreamer/Video.cs
+++ b/src/Backends/GStreamer/Video.cs
@@ -105,7 +105,7 @@ namespace Mistelix.Backends.GStreamer
 				msg = String.Format (Catalog.GetString ("The file '{0}' is encoded in a recognised format. However, you are missing the GStreamer plug-in '{1}' to decode it."), file, rslt);
 				return false;
 			default:
-				throw new Exception ("Unexpected result");
+				throw new InvalidOperationException ("Unexpected result");
 			}
 		}
 
diff --git a/src/Core/Dependencies.cs b/src/Core/Dependencies.cs
index 0e7c1d7..33da7a2 100644
--- a/src/Core/Dependencies.cs
+++ b/src/Core/Dependencies.cs
@@ -78,7 +78,7 @@ namespace Mistelix.Core
 
 		List <Dependency> DependencyList;
 		bool status_checked;
-		bool dvd_support, theora_support;
+		bool dvd_support, theora_support, mp3_support;
 
 		public Dependencies ()
 		{
@@ -116,6 +116,13 @@ namespace Mistelix.Core
 			}
 		}
 
+		public bool MP3Support {
+			get {
+				Check ();
+				return mp3_support;
+			}
+		}
+
 		public List <Dependency> Status {
 			get {
 				Check ();
@@ -186,6 +193,8 @@ namespace Mistelix.Core
 			{
 				theora_support = true;
 			}
+	
+			mp3_support = founds [(int) Codecs.FLUMP3DEC];
 		}
 
 		void CheckFmpeg (string [] used, bool [] founds)
diff --git a/src/Core/SlideShow.cs b/src/Core/SlideShow.cs
index 4314595..767342c 100644
--- a/src/Core/SlideShow.cs
+++ b/src/Core/SlideShow.cs
@@ -23,6 +23,7 @@
 
 using System;
 using Gdk;
+using Mono.Unix;
 
 using Mistelix.Transitions;
 using Mistelix.Core;
@@ -150,6 +151,30 @@ namespace Mistelix.Core
 			}
 			return collection;
 		}
+
+		// Check if the audio uses a supported format
+		public bool AudioSupportedFormat (out string msg)
+		{
+			Dependencies dependencies;
+			string format;
+
+			format = Backends.GStreamer.DetectMedia.GetType (AudioFile);
+			Logger.Debug ("SlideShow.SupportedFormat. Filename {0} is {1}", AudioFile, format);
+
+			dependencies = new Dependencies ();
+			
+			if (String.Compare (format, "application/x-id3", StringComparison.OrdinalIgnoreCase) == 0)
+			{				
+				if (dependencies.MP3Support == false)
+				{
+					msg = String.Format (Catalog.GetString ("The file '{0}' is encoded in MP3 but you do not have the right codec installed."), AudioFile);
+					return false;
+				}
+			}
+
+			msg = string.Empty;
+			return true;
+		}
 	}
 }
 
diff --git a/src/DataModel/Project.cs b/src/DataModel/Project.cs
index e52fd3c..d83e5bd 100644
--- a/src/DataModel/Project.cs
+++ b/src/DataModel/Project.cs
@@ -60,6 +60,25 @@ namespace Mistelix.DataModel
 			get { return buttons;}
 		}
 
+		public bool AudioSupportedFormat (out string msg) 
+		{
+			SlideShow slide;
+
+			foreach (ProjectElement element in Elements)
+			{
+				slide = element as SlideShow;
+
+				if (slide == null)
+					continue;
+		
+				if (slide.AudioSupportedFormat (out msg) == false)
+					return false;
+			}
+
+			msg = string.Empty;
+			return true;
+		}
+
 		public string FileToFullPath (string file)
 		{
 			return Path.Combine (details.OutputDir, file);
diff --git a/src/Makefile.am b/src/Makefile.am
index f009ef1..a3349d2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -71,6 +71,7 @@ MISTELIX_CSDISTFILES =				\
 	$(srcdir)/Widgets/WelcomeView.cs \
 	$(srcdir)/DataModel/RecentFile.cs \
 	$(srcdir)/Core/RecentFilesStorage.cs \
+	$(srcdir)/Backends/GStreamer/DetectMedia.cs \
 	$(srcdir)/Backends/GStreamer/Video.cs \
 	$(srcdir)/Backends/GStreamer/Thumbnail.cs \
 	$(srcdir)/Backends/GStreamer/SlideShow.cs \
diff --git a/src/mistelix.cs b/src/mistelix.cs
index a8b5db2..444adc6 100644
--- a/src/mistelix.cs
+++ b/src/mistelix.cs
@@ -322,8 +322,26 @@ namespace Mistelix
 		{
 			Dependencies dependencies;
 			bool support;
+			string msg_audio;
 
 			dependencies = new Dependencies ();
+
+			if (project.AudioSupportedFormat (out msg_audio) == false)
+			{
+				string msg;
+				
+				msg = String.Format (Catalog.GetString (
+					// Translators: {0} is the error message
+					"{0}\n\nGo to 'Check Mistelix's Dependencies Requirements' dialog and make sure that you have the right audio codecs installed.\n\nIf you continue, your project will have no audio."), 
+					msg_audio);
+
+				MessageDialog md = new MessageDialog (app_window,
+		                      	DialogFlags.Modal, MessageType.Warning,
+		                      	ButtonsType.Ok, false, msg);
+
+				md.Run ();
+				md.Destroy ();
+			}
 						
 			if (project.Details.Type == ProjectType.DVD)
 				support = dependencies.DvdSupport;