Initial implementation of BMediaEncoder

* People interested, please review!
* This is based on the patch from Fredrik Moden which was based on
the Oleg Krysenkov one.
* The original patch has been reworked by myself.
* Adapted the code to work with the new PluginManager API which
differently than before doesn't need to contact the media_server.

headers/private/media/EncoderPlugin.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2009, Haiku Inc. All rights reserved.
+ * Copyright 2009-2015, Haiku Inc. All rights reserved.
  * Distributed under the terms of the MIT license.
  */
 #ifndef _ENCODER_PLUGIN_H
@@ -122,6 +122,9 @@ public:
 	virtual	Encoder*			NewEncoder(
 									const media_codec_info& codecInfo) = 0;
 
+	virtual	Encoder*			NewEncoder(
+									const media_format& format) = 0;
+
 	virtual	status_t			RegisterNextEncoder(int32* cookie,
 									media_codec_info* codecInfo,
 									media_format_family* formatFamily,