media_kit: Remove most private dependencies from codec_kit

* Move to BCodecKit namespace and make extensive use
of BCodecRoster.
* This is a first step in the right direction of
decreasing private dependencies. Some APIs are being
translated to the CodecKit. I am doing an investigation
on which APIs are really used among apps, so that the new
kit can be more slim and oriented toward easy development
and can be extended in the right direction instead to
continue maintaning unuseful code.
* BMediaFormats needs still a bit of love.
* General improvements in style and code maintainability.

headers/os/media/MediaDecoder.h

@@ -1,7 +1,7 @@
 #ifndef MEDIADECODER_H
 #define MEDIADECODER_H
 
-#include <MediaDefs.h>
+
 #include <MediaFormats.h>
 
 

headers/os/media/MediaEncoder.h

@@ -8,14 +8,10 @@
 
 #include <MediaFormats.h>
 
-namespace BPrivate {
-	namespace media {
-		class BEncoder;
-		class BEncoderPlugin;
-	}
-}
 
-using namespace BPrivate::media;
+namespace BCodecKit {
+	class BEncoder;
+}
 
 
 class BMediaEncoder {
@@ -84,7 +80,7 @@ private:
 			void				ReleaseEncoder();
 
 			uint32				_reserved_was_fEncoderMgr;
-			BEncoder*			fEncoder;
+			BCodecKit::BEncoder* fEncoder;
 
 			int32				fEncoderID;
 			bool				fFormatValid;

headers/os/media/MediaFile.h

@@ -13,12 +13,13 @@
 #include <StorageDefs.h>
 
 
+namespace BCodecKit {
+	class BMediaExtractor;
+	class BMediaStreamer;
+	class BMediaWriter;
+}
+
 namespace BPrivate {
-	namespace media {
-		class BMediaExtractor;
-		class BMediaStreamer;
-		class BMediaWriter;
-	}
 	class _AddonManager;
 }
 
@@ -162,18 +163,18 @@ private:
 			status_t			ControlFile(int32 selector, void* ioData,
 									size_t size);
 
-			BPrivate::media::BMediaExtractor* fExtractor;
+			BCodecKit::BMediaExtractor* fExtractor;
 			int32				_reserved_BMediaFile_was_fExtractorID;
 			int32				fTrackNum;
 			status_t			fErr;
 
 			BPrivate::_AddonManager* fEncoderMgr;
 			BPrivate::_AddonManager* fWriterMgr;
-			BPrivate::media::BMediaWriter* fWriter;
+			BCodecKit::BMediaWriter* fWriter;
 			int32				fWriterID;
 			media_file_format	fMFI;
 
-			BPrivate::media::BMediaStreamer* fStreamer;
+			BCodecKit::BMediaStreamer* fStreamer;
 
 			bool				fFileClosed;
 			bool				fDeleteSource;

headers/os/media/MediaTrack.h

@@ -9,12 +9,12 @@
 #include <MediaFormats.h>
 
 
-namespace BPrivate { namespace media {
+namespace BCodecKit {
 	class BDecoder;
 	class BEncoder;
 	class BMediaExtractor;
 	class BMediaWriter;
-} }
+}
 
 class BMessage;
 class BView;
@@ -219,12 +219,12 @@ private:
 
 	// For read-only access to a BMediaTrack
 								BMediaTrack(
-									BPrivate::media::BMediaExtractor* extractor,
+									BCodecKit::BMediaExtractor* extractor,
 									int32 streamIndex);
 
 	// For write-only access to a BMediaTrack
 								BMediaTrack(
-									BPrivate::media::BMediaWriter* writer,
+									BCodecKit::BMediaWriter* writer,
 									int32 streamIndex, media_format* format,
 									const media_codec_info* codecInfo);
 
@@ -235,9 +235,9 @@ private:
 
 private:
 			status_t			fInitStatus;
-			BPrivate::media::BDecoder* fDecoder;
-			BPrivate::media::BDecoder* fRawDecoder;
-			BPrivate::media::BMediaExtractor* fExtractor;
+			BCodecKit::BDecoder* fDecoder;
+			BCodecKit::BDecoder* fRawDecoder;
+			BCodecKit::BMediaExtractor* fExtractor;
 
 			int32				fStream;
 			int64				fCurrentFrame;
@@ -245,9 +245,9 @@ private:
 
 			media_codec_info	fCodecInfo;
 
-			BPrivate::media::BEncoder* fEncoder;
+			BCodecKit::BEncoder* fEncoder;
 			int32				fEncoderID;
-			BPrivate::media::BMediaWriter* fWriter;
+			BCodecKit::BMediaWriter* fWriter;
 			media_format		fFormat;
 
 			uint32				fWorkaroundFlags;