From f58dfb4517ce3fbea78ebbb06ac780ecba5c3bd8 Mon Sep 17 00:00:00 2001
From: "Zeeshan Ali (Khattak)" <zeeshanak@src.gnome.org>
Date: Sat, 21 Mar 2009 13:54:30 +0000
Subject: [PATCH] Add MP2Transcoder.

A new transcoding class for transcoding to mp2 audio.

svn path=/trunk/; revision=691
---
 src/rygel/Makefile.am               |   7 ++-
 src/rygel/rygel-mp2-transcoder.vala | 108 ++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 src/rygel/rygel-mp2-transcoder.vala

diff --git a/src/rygel/Makefile.am b/src/rygel/Makefile.am
index 06cbc1c..87ee594 100644
--- a/src/rygel/Makefile.am
+++ b/src/rygel/Makefile.am
@@ -125,7 +125,9 @@ rygel_SOURCES = $(VAPI_SOURCE_FILES) \
 		rygel-media-item.c \
 		rygel-media-item.h \
 		rygel-mp2ts-transcoder.h \
-		rygel-mp2ts-transcoder.c
+		rygel-mp2ts-transcoder.c \
+		rygel-mp2-transcoder.h \
+		rygel-mp2-transcoder.c
 
 rygel.stamp: $(filter %.vala,$(rygel_SOURCES))
 	$(VALAC) -C --vapidir=$(srcdir) \
@@ -163,7 +165,8 @@ VAPI_SOURCE_FILES = rygel-content-directory.vala \
 		    rygel-media-item.vala \
 		    rygel-browse.vala \
 		    rygel-didl-lite-writer.vala \
-		    rygel-mp2ts-transcoder.vala
+		    rygel-mp2ts-transcoder.vala \
+		    rygel-mp2-transcoder.vala
 
 rygel-1.0.vapi: $(VAPI_SOURCE_FILES)
 	$(VALAC) -C --library=rygel-1.0 \
diff --git a/src/rygel/rygel-mp2-transcoder.vala b/src/rygel/rygel-mp2-transcoder.vala
new file mode 100644
index 0000000..37e5661
--- /dev/null
+++ b/src/rygel/rygel-mp2-transcoder.vala
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2009 Nokia Corporation, all rights reserved.
+ *
+ * Author: Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
+ *                               <zeeshan.ali@nokia.com>
+ *
+ * This file is part of Rygel.
+ *
+ * Rygel is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Rygel is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+using Rygel;
+using Gst;
+
+internal class Rygel.MP2Transcoder : Gst.Bin {
+   private const string DECODEBIN = "decodebin2";
+   private const string AUDIO_CONVERT = "audioconvert";
+   private const string AUDIO_ENCODER = "twolame";
+
+   private dynamic Element audio_enc;
+
+   public MP2Transcoder (Element src) throws Error {
+        Element decodebin = ElementFactory.make (DECODEBIN, DECODEBIN);
+        if (decodebin == null) {
+            throw new LiveResponseError.MISSING_PLUGIN (
+                                    "Required element '%s' missing", DECODEBIN);
+        }
+
+        this.audio_enc = this.create_audio_encoder ();
+
+        this.add_many (src, decodebin);
+        src.link (decodebin);
+
+        var src_pad = this.audio_enc.get_static_pad ("src");
+        var ghost = new GhostPad (null, src_pad);
+        this.add_pad (ghost);
+
+        decodebin.pad_added += this.decodebin_pad_added;
+   }
+
+   private void decodebin_pad_added (Element decodebin,
+                                     Pad     new_pad) {
+       Pad enc_pad = this.audio_enc.get_compatible_pad (new_pad, null);
+       if (enc_pad == null) {
+           return;
+       }
+
+       this.add_many (this.audio_enc);
+
+       if (new_pad.link (enc_pad) != PadLinkReturn.OK) {
+           this.post_error (new LiveResponseError.LINK (
+                       "Failed to link pad %s to %s",
+                       new_pad.name,
+                       enc_pad.name));
+           return;
+       }
+
+       this.audio_enc.sync_state_with_parent ();
+   }
+
+   private Element create_audio_encoder () throws Error {
+       var convert = ElementFactory.make (AUDIO_CONVERT, AUDIO_CONVERT);
+       if (convert == null) {
+           throw new LiveResponseError.MISSING_PLUGIN (
+                   "Required element '%s' missing",
+                   AUDIO_CONVERT);
+       }
+
+       var encoder = ElementFactory.make (AUDIO_ENCODER, AUDIO_ENCODER);
+       if (encoder == null) {
+           throw new LiveResponseError.MISSING_PLUGIN (
+                   "Required element '%s' missing",
+                   AUDIO_ENCODER);
+       }
+
+       var bin = new Bin ("audio-encoder-bin");
+       bin.add_many (convert, encoder);
+
+       var filter = Caps.from_string ("audio/x-raw-int");
+       convert.link_filtered (encoder, filter);
+
+       var pad = convert.get_static_pad ("sink");
+       var ghost = new GhostPad (null, pad);
+       bin.add_pad (ghost);
+
+       pad = encoder.get_static_pad ("src");
+       ghost = new GhostPad (null, pad);
+       bin.add_pad (ghost);
+
+       return bin;
+   }
+
+   private void post_error (Error error) {
+       Message msg = new Message.error (this, error, error.message);
+       this.post_message (msg);
+   }
+}
-- 
2.7.4