Gstreamer filter

From: Adam Lofts <adam negligible co uk>
To: Dashboard <dashboard-hackers gnome org>
Subject: Gstreamer filter
Date: Sun, 07 Nov 2004 19:30:56 +0000

Hi,

I've written a Gstreamer filter which currently extracts tags
from .mp3, .ogg, .wmv, .asf and .flac. You need module gst-sharp installed 
(from mono cvs) and the relevant decoder plugin (e.g. gstreamer0.8-flac 
for flac tags).

In theory, simply adding a mime type to the filter should enable video
tag extraction of any video format nautilus will give you tag information
about - but I can't test this since i have no tagged video
files. Gstreamer should also be able to extract tags from images but I
haven't got this to work yet.

Cheers,

Adam

//
// FilterGst.cs
//
// Copyright (C) 2004 Adam Lofts
//

//
// 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.IO;
using Gst;
using Beagle.Util;

namespace Beagle.Filters {

	public class FilterGst : Beagle.Daemon.Filter {

		static bool has_inited = false;
		private static void InitGst() {
			if (!has_inited) {
				Gst.Application.Init("Beagle");
				has_inited = true;
			}
		}

		public FilterGst ()
		{
			InitGst();

			Element decoder;
			
			decoder = ElementFactory.Make("mad",null);
			if (decoder != null)
				AddSupportedMimeType ("audio/x-mp3");

			decoder = ElementFactory.Make("vorbisdec",null);
			if (decoder != null)
				AddSupportedMimeType ("application/ogg");

			decoder = ElementFactory.Make("flacdec",null);
			if (decoder != null)
				AddSupportedMimeType ("application/x-flac");
			
			decoder = ElementFactory.Make("asfdemux",null);
			if (decoder != null)
				AddSupportedMimeType ("video/x-ms-asf");
		}

		bool keep_looking;

		protected override void DoPullProperties ()
		{
			//Util.Logger.Log.Debug("FilterGst begin: {0}", FileInfo.FullName);

			Pipeline pipe = new Pipeline(null);

			FileSrc src = ElementFactory.Make ("filesrc", null) as FileSrc;
			Spider spider = ElementFactory.Make ("spider", null) as Spider;
			FakeSink sink = ElementFactory.Make ("fakesink", null) as FakeSink;

			pipe.Add(src);
			pipe.Add(spider);
			pipe.Add(sink);
	
			src.Link(spider);
		
			Caps caps = Caps.FromString("audio/x-raw-int");
			spider.LinkFiltered(sink, caps);

			src.Location = FileInfo.FullName;
			sink.SignalHandoffs = true;
		
			spider.FoundTag += FoundTagHandler;
			pipe.Error += ErrorHandler;
			sink.Handoff += HandoffHandler;

			pipe.SetState(ElementState.Playing);
			keep_looking = true;
			while (pipe.Iterate() && keep_looking) { /* wait here! */ }
			pipe.SetState(ElementState.Null);

			Finished ();
			//Util.Logger.Log.Debug("FilterGst end: {0}", FileInfo.FullName);
		}

		void HandoffHandler (object o, HandoffArgs args) {
			keep_looking = false; 
		}
		void ErrorHandler (object o, ErrorArgs args) {
			Logger.Log.Warn("FilterGst error: {0}", args.Debug);
			keep_looking = false; 
		}
		void FoundTagHandler (object o, FoundTagArgs args) {
			TagList list = args.TagList;
			list.Foreach(new TagForeachFunc(TagForeachFunc));
			//Util.Logger.Log.Debug("FilterGst Got tags");
		}
		void TagForeachFunc (TagList list, string tag) {
			string val_str;
			
			switch (tag) {
				//Strings
				case "comment":
				case "title":
				case "genre":
				case "artist":
				case "album":
				list.GetString(tag, out val_str);
				AddProperty (Beagle.Property.New ("fixme:" + tag, val_str));
				break;
			}
		}
	}
}

/* Stolen from Gstreamer gsttag.h - All possible tags?

#define GST_TAG_TITLE			"title"
#define GST_TAG_ARTIST			"artist"
#define GST_TAG_ALBUM			"album"
#define GST_TAG_DATE			"date"
#define GST_TAG_GENRE			"genre"
#define GST_TAG_COMMENT			"comment"
#define GST_TAG_TRACK_NUMBER		"track-number"
#define GST_TAG_TRACK_COUNT		"track-count"
#define GST_TAG_ALBUM_VOLUME_NUMBER	"album-disc-number"
#define GST_TAG_ALBUM_VOLUME_COUNT	"album-disc-count"
#define GST_TAG_LOCATION		"location"
#define GST_TAG_DESCRIPTION		"description"
#define GST_TAG_VERSION			"version"
#define GST_TAG_ISRC			"isrc"
#define GST_TAG_ORGANIZATION		"organization"
#define GST_TAG_COPYRIGHT		"copyright"
#define GST_TAG_CONTACT			"contact"
#define GST_TAG_LICENSE			"license"
#define GST_TAG_PERFORMER		"performer"
#define GST_TAG_DURATION		"duration"
#define GST_TAG_CODEC			"codec"
#define GST_TAG_VIDEO_CODEC		"video-codec"
#define GST_TAG_AUDIO_CODEC		"audio-codec"
#define GST_TAG_BITRATE			"bitrate"
#define GST_TAG_NOMINAL_BITRATE		"nominal-bitrate"
#define GST_TAG_MINIMUM_BITRATE		"minimum-bitrate"
#define GST_TAG_MAXIMUM_BITRATE		"maximum-bitrate"
#define GST_TAG_SERIAL			"serial"
#define GST_TAG_ENCODER			"encoder"
#define GST_TAG_ENCODER_VERSION		"encoder-version"
#define GST_TAG_TRACK_GAIN		"replaygain-track-gain"
#define GST_TAG_TRACK_PEAK		"replaygain-track-peak"
#define GST_TAG_ALBUM_GAIN  		"replaygain-album-gain"
#define GST_TAG_ALBUM_PEAK		"replaygain-album-peak"
*/

? beagle/Filters/FilterGst.cs
Index: beagle/configure.in
===================================================================
RCS file: /cvs/gnome/beagle/configure.in,v
retrieving revision 1.53
diff -u -r1.53 configure.in
--- beagle/configure.in	4 Nov 2004 21:46:59 -0000	1.53
+++ beagle/configure.in	7 Nov 2004 19:28:44 -0000
@@ -207,6 +207,9 @@
 PKG_CHECK_MODULES(GSF_SHARP, gsf-sharp, enable_gsf_sharp=yes, enable_gsf_sharp=no)
 AM_CONDITIONAL(ENABLE_GSF_SHARP, test "x$enable_gsf_sharp" = "xyes")
 
+PKG_CHECK_MODULES(GST_SHARP, gst-sharp, enable_gst_sharp=yes, enable_gst_sharp=no)
+AM_CONDITIONAL(ENABLE_GST_SHARP, test "x$enable_gst_sharp" = "xyes")
+
 PKG_CHECK_MODULES(BEAGLED, gtk-sharp dbus-sharp gconf-sharp)
 BEAGLED_LIBS="$BEAGLED_LIBS $EVO_SHARP_LIBS $GSF_SHARP_LIBS"
 AC_SUBST(BEAGLED_LIBS)
@@ -320,6 +323,7 @@
 	Prefix:			${prefix}
 	Evolution-Sharp?	${enable_evo_sharp}
 	gsf-sharp?		${enable_gsf_sharp}
+	gst-sharp?		${enable_gst_sharp}
 	Epiphany Extension?	${enable_epiphany_extension}
 	Mozilla Extension?	yes
 
Index: beagle/Filters/Makefile.am
===================================================================
RCS file: /cvs/gnome/beagle/Filters/Makefile.am,v
retrieving revision 1.23
diff -u -r1.23 Makefile.am
--- beagle/Filters/Makefile.am	4 Nov 2004 16:34:12 -0000	1.23
+++ beagle/Filters/Makefile.am	7 Nov 2004 19:28:45 -0000
@@ -25,7 +25,6 @@
 	$(srcdir)/FilterFlac.cs		\
 	$(srcdir)/FilterJpeg.cs		\
 	$(srcdir)/FilterMan.cs		\
-	$(srcdir)/FilterMusic.cs	\
 	$(srcdir)/FilterOpenOffice.cs	\
 	$(srcdir)/FilterPdf.cs		\
 	$(srcdir)/FilterPng.cs		\
@@ -40,6 +39,14 @@
 	$(srcdir)/FilterPPT.cs
 endif
 
+if ENABLE_GST_SHARP
+CSFILES +=				\
+	$(srcdir)/FilterGst.cs
+else
+CSFILES +=				\
+	$(srcdir)/FilterMusic.cs
+endif
+
 LOCAL_ASSEMBLIES =				\
 	../Util/Util.dll			\
 	../BeagleClient/Beagle.dll		\
@@ -49,6 +56,11 @@
 	$(BEAGLED_LIBS)			\
 	-r:ICSharpCode.SharpZipLib.dll	\
 	$(LOCAL_ASSEMBLIES:%=-r:%)
+
+if ENABLE_GST_SHARP
+ASSEMBLIES +=				\
+	$(GST_SHARP_LIBS)
+endif
 
 RESOURCES =

Follow-Ups:
- Re: Gstreamer filter
  - From: Christopher James Lahey

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