integration of codec API into BMediaFile and BMediaTrack

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5468 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/media/MediaFile.h

@@ -10,7 +10,9 @@
 
 
 namespace BPrivate {
-	class MediaExtractor;
+	namespace media {
+		class MediaExtractor;
+	}
 	class _IMPEXP_MEDIA MediaWriter;
 	class _AddonManager;
 }
@@ -61,12 +63,6 @@ public:
 							   const media_file_format * mfi,
 							   int32 flags=0);
 		   
-/* modified by Marcus Overhagen */
-BMediaFile(const media_file_format * mfi,
-					   int32 flags);
-/* modified by Marcus Overhagen */
-					   
-					   
 	virtual			~BMediaFile();
 
 	status_t		InitCheck() const;
@@ -123,7 +119,7 @@ BMediaFile(const media_file_format * mfi,
 	virtual	status_t Perform(int32 selector, void * data);
 
 private:
-	BPrivate::MediaExtractor *fExtractor;
+	BPrivate::media::MediaExtractor *fExtractor;
 	int32					_reserved_BMediaFile_was_fExtractorID;
 	int32					fTrackNum;
 	status_t				fErr;
@@ -136,7 +132,7 @@ private:
 
 	bool					fFileClosed;
 	bool					_reserved_was_fUnused[3];
-	BList					*fTrackList;
+	BMediaTrack				**fTrackList;
 
 	void					Init();
 	void					InitReader(BDataIO *source, int32 flags = 0);
@@ -147,12 +143,12 @@ private:
 	BMediaFile(const BMediaFile&);
 	BMediaFile& operator=(const BMediaFile&);
 
-	BFile					*fFile;
+	BDataIO					*fSource;
 
 
 	/* fbc data and virtuals */
 
-	uint32 _reserved_BMediaFile_[32];
+		uint32 _reserved_BMediaFile_[32];
 
 virtual	status_t _Reserved_BMediaFile_0(int32 arg, ...);
 virtual	status_t _Reserved_BMediaFile_1(int32 arg, ...);

headers/os/media/MediaTrack.h

@@ -6,10 +6,12 @@
 #include <MediaFormats.h>
 
 namespace BPrivate {
-	class MediaExtractor;
-	class Decoder;
 	class MediaWriter;
-	class Encoder;
+	namespace media {
+		class MediaExtractor;
+		class Decoder;
+		class Encoder;
+	}
 }
 
 class BView;
@@ -192,23 +194,22 @@ public:
 virtual	status_t Perform(int32 selector, void * data);
 
 private:
+	friend class BMediaFile;
+	
 					// for read-only access to a track
-					BMediaTrack(BPrivate::MediaExtractor *extractor, int32 stream);
+					BMediaTrack(BPrivate::media::MediaExtractor *extractor, int32 stream);
 
 					// for write-only access to a BMediaTrack
 					BMediaTrack(BPrivate::MediaWriter *writer,
 								int32 stream_num,
 								media_format *in_format,
-								BPrivate::Encoder *encoder,
+								BPrivate::media::Encoder *encoder,
 								media_codec_info *mci);
 
-	status_t		TrackInfo(media_format *out_format, void **out_info,
-							  int32 *out_infoSize);
-
 	status_t				fErr;
-	BPrivate::Decoder		*fDecoder;
+	BPrivate::media::Decoder *fDecoder;
-	int32					fDecoderID;
+	int32					__unused__fDecoderID;
-	BPrivate::MediaExtractor *fExtractor;
+	BPrivate::media::MediaExtractor *fExtractor;
 
 	int32					fStream;
 	int64					fCurFrame;
@@ -216,26 +217,21 @@ private:
 
 	media_codec_info		fMCI;
 
-	BPrivate::Encoder		*fEncoder;
+	BPrivate::media::Encoder *fEncoder;
 	int32					fEncoderID;
 	BPrivate::MediaWriter	*fWriter;
 	media_format			fWriterFormat;
-	void					*fExtractorCookie;
+	void					*__unused__fExtractorCookie;
 
 protected:
 	int32			EncoderID() { return fEncoderID; };
 
 private:
 
-friend class BMediaFile;
-friend class BPrivate::Decoder;
-
 	BMediaTrack();
 	BMediaTrack(const BMediaTrack&);
 	BMediaTrack& operator=(const BMediaTrack&);
 
-static	BPrivate::Decoder *	find_decoder(BMediaTrack *track, int32 *id);
-
 	/* fbc data and virtuals */
 
 	uint32 _reserved_BMediaTrack_[31];

headers/private/media/DecoderPlugin.h

@@ -1,6 +1,7 @@
 #include <MediaTrack.h>
 #include <MediaFormats.h>
 #include "MediaPlugin.h"
+#include "ReaderPlugin.h"
 
 namespace BPrivate { namespace media {
 
@@ -14,19 +15,20 @@ public:
 	virtual status_t	Setup(media_format *ioEncodedFormat, media_format *ioDecodedFormat,
 							  const void *infoBuffer, int32 infoSize) = 0;
 	
-	virtual status_t	Seek(media_seek_type seekTo,
+	virtual status_t	Seek(uint32 seekTo,
 							 int64 seekFrame, int64 *frame,
 							 bigtime_t seekTime, bigtime_t *time) = 0;
 							 
 	virtual status_t	Decode(void *buffer, int64 *frameCount,
-							   media_header *mediaHeader, media_decode_info *info) = 0;
+							   media_header *mediaHeader, media_decode_info *info = 0) = 0;
 							   
 	status_t			GetNextChunk(void **chunkBuffer, int32 *chunkSize,
 									 media_header *mediaHeader);
 
 private:
-	void				Setup(BMediaTrack *reader);
+	void				Setup(Reader *reader, void *readerCookie);
-	BMediaTrack *		fReader;
+	Reader *			fReader;
+	void *				fReaderCookie;
 };
 
 

headers/private/media/MediaExtractor.h

@@ -0,0 +1,44 @@
+#ifndef _MEDIA_EXTRACTOR_H
+#define _MEDIA_EXTRACTOR_H
+
+#include "ReaderPlugin.h"
+#include "DecoderPlugin.h"
+
+namespace BPrivate {
+namespace media {
+
+class MediaExtractor
+{
+public:
+					MediaExtractor(BDataIO * source, int32 flags);
+					~MediaExtractor();
+
+	status_t		InitCheck();
+			
+	void			GetFileFormatInfo(media_file_format *mfi) const;
+
+	int32			StreamCount();
+	
+	media_format *	EncodedFormat(int32 stream);
+	int64			CountFrames(int32 stream) const;
+	bigtime_t		Duration(int32 stream) const;
+	void *			InfoBuffer(int32 stream) const;
+	int32			InfoBufferSize(int32 stream) const;
+
+	status_t		Seek(int32 stream, uint32 seekTo,
+						 int64 *frame, bigtime_t *time);
+	
+	status_t		GetNextChunk(int32 stream,
+								 void **chunkBuffer, int32 *chunkSize,
+								 media_header *mediaHeader);
+
+	status_t		CreateDecoder(int32 stream, Decoder **decoder, media_codec_info *mci);
+	
+};
+
+}; // namespace media
+}; // namespace BPrivate
+
+using namespace BPrivate::media;
+
+#endif

src/add-ons/media/plugins/mp3_decoder/mp3DecoderPlugin.cpp

@@ -40,7 +40,7 @@ mp3Decoder::Setup(media_format *ioEncodedFormat, media_format *ioDecodedFormat,
 }
 
 status_t
-mp3Decoder::Seek(media_seek_type seekTo,
+mp3Decoder::Seek(uint32 seekTo,
 				 int64 seekFrame, int64 *frame,
 				 bigtime_t seekTime, bigtime_t *time)
 {
@@ -52,7 +52,7 @@ mp3Decoder::Seek(media_seek_type seekTo,
 
 status_t
 mp3Decoder::Decode(void *buffer, int64 *frameCount,
-				   media_header *mediaHeader, media_decode_info *info)
+				   media_header *mediaHeader, media_decode_info *info /* = 0 */)
 {
 	void *chunkBuffer;
 	int32 chunkSize;

src/add-ons/media/plugins/mp3_decoder/mp3DecoderPlugin.h

@@ -11,7 +11,7 @@ public:
 	status_t	Setup(media_format *ioEncodedFormat, media_format *ioDecodedFormat,
 					  const void *infoBuffer, int32 infoSize);
 
-	status_t	Seek(media_seek_type seekTo,
+	status_t	Seek(uint32 seekTo,
 					 int64 seekFrame, int64 *frame,
 					 bigtime_t seekTime, bigtime_t *time);
 

src/add-ons/media/plugins/raw_decoder/RawDecoderPlugin.cpp

@@ -30,7 +30,7 @@ RawDecoder::Setup(media_format *ioEncodedFormat, media_format *ioDecodedFormat,
 
 
 status_t
-RawDecoder::Seek(media_seek_type seekTo,
+RawDecoder::Seek(uint32 seekTo,
 				 int64 seekFrame, int64 *frame,
 				 bigtime_t seekTime, bigtime_t *time)
 {
@@ -40,7 +40,7 @@ RawDecoder::Seek(media_seek_type seekTo,
 
 status_t
 RawDecoder::Decode(void *buffer, int64 *frameCount,
-				   media_header *mediaHeader, media_decode_info *info)
+				   media_header *mediaHeader, media_decode_info *info /* = 0 */)
 {
 	void *chunkBuffer;
 	int32 chunkSize;

src/add-ons/media/plugins/raw_decoder/RawDecoderPlugin.h

@@ -6,7 +6,7 @@ public:
 	status_t	Setup(media_format *ioEncodedFormat, media_format *ioDecodedFormat,
 					  const void *infoBuffer, int32 infoSize);
 	
-	status_t	Seek(media_seek_type seekTo,
+	status_t	Seek(uint32 seekTo,
 					 int64 seekFrame, int64 *frame,
 					 bigtime_t seekTime, bigtime_t *time);
 							 

src/kits/media/DecoderPlugin.cpp

@@ -15,16 +15,16 @@ status_t
 Decoder::GetNextChunk(void **chunkBuffer, int32 *chunkSize,
 					  media_header *mediaHeader)
 {
-	return fReader->ReadChunk((char **)chunkBuffer, chunkSize, mediaHeader);
+	return fReader->GetNextChunk(fReaderCookie, chunkBuffer, chunkSize, mediaHeader);
 }
 
 void
-Decoder::Setup(BMediaTrack *reader)
+Decoder::Setup(Reader *reader, void *readerCookie)
 {
 	fReader = reader;
+	fReaderCookie = readerCookie;
 }
 
-
 DecoderPlugin::DecoderPlugin()
 {
 }

src/kits/media/Jamfile

@@ -73,6 +73,7 @@ SharedLibrary media :
 	MediaPlugin.cpp
 	ReaderPlugin.cpp
 	DecoderPlugin.cpp
+	MediaExtractor.cpp
 ;
 
 LinkSharedOSLibs libmedia.so :

src/kits/media/MediaExtractor.cpp

@@ -0,0 +1,78 @@
+#include "MediaExtractor.h"
+
+MediaExtractor::MediaExtractor(BDataIO * source, int32 flags)
+{
+}
+
+MediaExtractor::~MediaExtractor()
+{
+}
+
+status_t
+MediaExtractor::InitCheck()
+{
+	return B_OK;
+}
+
+void
+MediaExtractor::GetFileFormatInfo(media_file_format *mfi) const
+{
+}
+
+int32
+MediaExtractor::StreamCount()
+{
+	return 0;
+}
+
+media_format *
+MediaExtractor::EncodedFormat(int32 stream)
+{
+	return 0;
+}
+
+int64
+MediaExtractor::CountFrames(int32 stream) const
+{
+	return 0;
+}
+
+bigtime_t
+MediaExtractor::Duration(int32 stream) const
+{
+	return 0;
+}
+
+void *
+MediaExtractor::InfoBuffer(int32 stream) const
+{
+	return 0;
+}
+
+int32
+MediaExtractor::InfoBufferSize(int32 stream) const
+{
+	return 0;
+}
+
+status_t
+MediaExtractor::Seek(int32 stream, uint32 seekTo,
+					 int64 *frame, bigtime_t *time)
+{
+	return B_OK;
+}
+
+status_t
+MediaExtractor::GetNextChunk(int32 stream,
+							 void **chunkBuffer, int32 *chunkSize,
+							 media_header *mediaHeader)
+{
+	return B_OK;
+}
+
+status_t
+MediaExtractor::CreateDecoder(int32 stream, Decoder **decoder, media_codec_info *mci)
+{
+	return B_OK;
+}
+

src/kits/media/MediaFile.cpp

@@ -5,6 +5,9 @@
  ***********************************************************************/
 #include <MediaFile.h>
 #include <MediaTrack.h>
+#include <File.h>
+#include <string.h>
+#include "MediaExtractor.h"
 #include "debug.h"
 
 
@@ -14,66 +17,78 @@
 
 BMediaFile::BMediaFile(const entry_ref *ref)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	Init();
+	InitReader(new BFile(ref, O_RDONLY));
 }
 
 BMediaFile::BMediaFile(BDataIO * source)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	Init();
+	InitReader(source);
 }
 
 BMediaFile::BMediaFile(const entry_ref * ref,
 					   int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	Init();
+	InitReader(new BFile(ref, O_RDONLY), flags);
 }
 
 BMediaFile::BMediaFile(BDataIO * source,
 					   int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	Init();
+	InitReader(source, flags);
 }
 
 BMediaFile::BMediaFile(const entry_ref *ref,
 					   const media_file_format * mfi,
 					   int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	Init();
+	InitWriter(new BFile(ref, O_WRONLY), mfi, flags);
 }
 					   
 BMediaFile::BMediaFile(BDataIO	*destination,
 					   const media_file_format * mfi,
 					   int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
-}
+	Init();
-
+	InitWriter(destination, mfi, flags);
-
-BMediaFile::BMediaFile(const media_file_format * mfi,
-					   int32 flags)
-{
-	UNIMPLEMENTED();
 }
 
 /* virtual */
 BMediaFile::~BMediaFile()
 {
-	UNIMPLEMENTED();
+	CALLED();
+	
+	ReleaseAllTracks();
+	delete fTrackList;
+	delete fExtractor;
+	delete fSource;
 }
 
 status_t 
 BMediaFile::InitCheck() const
 {
-	UNIMPLEMENTED();
+	CALLED();
-
+	return fErr;
-	return B_OK;
 }
 
 // Get info about the underlying file format.
 status_t 
 BMediaFile::GetFileFormatInfo(media_file_format *mfi) const
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (fErr)
+		return B_ERROR;
+	*mfi = fMFI;
 	return B_OK;
 }
 
@@ -81,14 +96,13 @@ const char *
 BMediaFile::Copyright(void) const
 {
 	UNIMPLEMENTED();
-	return "";
+	return "BMediaFile::Copyright";
 }
 
 int32
 BMediaFile::CountTracks() const
 {
-	UNIMPLEMENTED();
+	return fTrackNum;
-	return 1;
 }
 
 
@@ -97,8 +111,12 @@ BMediaFile::CountTracks() const
 BMediaTrack	*
 BMediaFile::TrackAt(int32 index)
 {
-	UNIMPLEMENTED();
+	CALLED();
-	return new BMediaTrack(0, 0);
+	if (!fTrackList || !fExtractor || index < 0 || index >= fTrackNum)
+		return 0;
+	if (!fTrackList[index])
+		fTrackList[index] = new BMediaTrack(fExtractor, index);
+	return fTrackList[index];
 }
 
 
@@ -109,14 +127,31 @@ BMediaFile::TrackAt(int32 index)
 status_t
 BMediaFile::ReleaseTrack(BMediaTrack *track)
 {
-	UNIMPLEMENTED();
+	CALLED();
-	return B_OK;
+	if (!fTrackList || !track)
+		return B_ERROR;
+	for (int32 i = 0; i < fTrackNum; i++) {
+		if (fTrackList[i] == track) {
+			delete track;
+			fTrackList[i] = 0;
+			return B_OK;
+		}
+	}
+	return B_ERROR;
 }
 
 status_t 
 BMediaFile::ReleaseAllTracks(void)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fTrackList)
+		return B_ERROR;
+	for (int32 i = 0; i < fTrackNum; i++) {
+		if (fTrackList[i]) {
+			delete fTrackList[i];
+			fTrackList[i] = 0;
+		}
+	}
 	return B_OK;
 }
 
@@ -219,19 +254,44 @@ BMediaFile::Perform(int32 selector, void * data)
 void 
 BMediaFile::Init()
 {
-	UNIMPLEMENTED();
+	CALLED();
+	fSource = 0;
+	fTrackNum = 0;
+	fTrackList = 0;
+	fExtractor = 0;
+	fErr = B_OK;
+
+	// not used so far:
+	fEncoderMgr = 0;
+	fWriterMgr = 0;
+	fWriter = 0;
+	fWriterID = 0;
+	fFileClosed = 0;
 }
 
 void 
-BMediaFile::InitReader(BDataIO *source, int32 flags /* = 0 */)
+BMediaFile::InitReader(BDataIO *source, int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	
+	fSource = source;
+	fExtractor = new MediaExtractor(source, flags);
+	fErr = fExtractor->InitCheck();
+	if (fErr)
+		return;
+		
+	fExtractor->GetFileFormatInfo(&fMFI);
+	fTrackNum = fExtractor->StreamCount();
+	fTrackList = new BMediaTrack *[fTrackNum];
+	memset(fTrackList, 0, fTrackNum * sizeof(BMediaTrack *));
 }
 
 void
 BMediaFile::InitWriter(BDataIO *source, const media_file_format * mfi,  int32 flags)
 {
 	UNIMPLEMENTED();
+	fSource = source;
+	fErr = B_NOT_ALLOWED;
 }
 
 

src/kits/media/MediaTrack.cpp

@@ -4,6 +4,8 @@
  *  DESCR: 
  ***********************************************************************/
 #include <MediaTrack.h>
+#include "MediaExtractor.h"
+#include "ReaderPlugin.h"
 #include "debug.h"
 
 /*************************************************************
@@ -12,7 +14,8 @@
 
 BMediaTrack::~BMediaTrack()
 {
-	UNIMPLEMENTED();
+	CALLED();
+	delete fDecoder;
 }
 
 /*************************************************************
@@ -22,25 +25,33 @@ BMediaTrack::~BMediaTrack()
 status_t
 BMediaTrack::InitCheck() const
 {
-	UNIMPLEMENTED();
+	CALLED();
-
+	return fErr;
-	return B_OK;
 }
 
 
 status_t
 BMediaTrack::GetCodecInfo(media_codec_info *mci) const
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fDecoder)
+		return B_NO_INIT;
 
-	return B_ERROR;
+	*mci = fMCI;
+	return B_OK;
 }
 
 
 status_t
 BMediaTrack::EncodedFormat(media_format *out_format) const
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!out_format)
+		return B_BAD_VALUE;
+	if (!fExtractor)
+		return B_NO_INIT;
+
+	out_format = fExtractor->EncodedFormat(fStream);
 
 	return B_OK;
 }
@@ -49,45 +60,44 @@ BMediaTrack::EncodedFormat(media_format *out_format) const
 status_t
 BMediaTrack::DecodedFormat(media_format *inout_format)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!inout_format)
+		return B_BAD_VALUE;
+	if (!fExtractor || !fDecoder)
+		return B_NO_INIT;
 		
-	return B_OK;
+	return fDecoder->Setup(fExtractor->EncodedFormat(fStream), inout_format,
+						   fExtractor->InfoBuffer(fStream), fExtractor->InfoBufferSize(fStream));
 }
 
 
 int64
 BMediaTrack::CountFrames() const
 {
-	UNIMPLEMENTED();
+	CALLED();
-
+	return fExtractor ? fExtractor->CountFrames(fStream) : 0;
-	return 100000;
 }
 
 
 bigtime_t
 BMediaTrack::Duration() const
 {
-	UNIMPLEMENTED();
+	CALLED();
-
+	return fExtractor ? fExtractor->Duration(fStream) : 0;
-	return 1000000;
 }
 
 
 int64
 BMediaTrack::CurrentFrame() const
 {
-	UNIMPLEMENTED();
+	return fCurFrame;
-
-	return 0;
 }
 
 
 bigtime_t
 BMediaTrack::CurrentTime() const
 {
-	UNIMPLEMENTED();
+	return fCurTime;
-
-	return 0;
 }
 
 
@@ -96,21 +106,35 @@ BMediaTrack::ReadFrames(void *out_buffer,
 						int64 *out_frameCount,
 						media_header *mh)
 {
-	UNIMPLEMENTED();
+	return ReadFrames(out_buffer, out_frameCount, mh, 0);
-
-	return B_OK;
 }
 
 
 status_t
 BMediaTrack::ReadFrames(void *out_buffer,
 						int64 *out_frameCount,
-						media_header *mh,
+						media_header *mh /* = 0 */,
-						media_decode_info *info)
+						media_decode_info *info /* = 0 */)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fDecoder)
+		return B_NO_INIT;
+	if (!out_buffer || !out_frameCount)
+		return B_BAD_VALUE;
 	
-	return B_OK;
+	status_t result;	
+
+	media_header temp_header;
+	if (!mh)
+		mh = &temp_header;
+	
+	*out_frameCount = 0;
+	result = fDecoder->Decode(out_buffer, out_frameCount, mh, info);
+
+	fCurFrame += *out_frameCount;
+	fCurTime = mh->start_time;
+
+	return result;
 }
 
 
@@ -129,7 +153,34 @@ status_t
 BMediaTrack::SeekToTime(bigtime_t *inout_time,
 						int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fDecoder || !fExtractor)
+		return B_NO_INIT;
+	if (!inout_time || !(flags & B_MEDIA_SEEK_DIRECTION_MASK))
+		return B_BAD_VALUE;
+
+	status_t result;
+	uint32 seekTo;
+	bigtime_t seekTime;
+	
+	int64 frame;
+	bigtime_t time;
+	
+	seekTo = (flags & B_MEDIA_SEEK_DIRECTION_MASK) | B_MEDIA_SEEK_TO_TIME;
+	seekTime = *inout_time;
+	
+	time = seekTime;
+	result = fExtractor->Seek(fStream, seekTo, &frame, &time);
+	if (result != B_OK)
+		return result;
+		
+	result = fDecoder->Seek(seekTo, 0, &frame, seekTime, &time);
+	if (result != B_OK)
+		return result;
+		
+	*inout_time = time;
+	fCurFrame = frame;
+	fCurTime = time;
 
 	return B_OK;
 }
@@ -139,7 +190,34 @@ status_t
 BMediaTrack::SeekToFrame(int64 *inout_frame,
 						 int32 flags)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fDecoder || !fExtractor)
+		return B_NO_INIT;
+	if (!inout_frame || !(flags & B_MEDIA_SEEK_DIRECTION_MASK))
+		return B_BAD_VALUE;
+
+	status_t result;
+	uint32 seekTo;
+	int64 seekFrame;
+	
+	int64 frame;
+	bigtime_t time;
+	
+	seekTo = (flags & B_MEDIA_SEEK_DIRECTION_MASK) | B_MEDIA_SEEK_TO_FRAME;
+	seekFrame = *inout_frame;
+	
+	frame = seekFrame;
+	result = fExtractor->Seek(fStream, seekTo, &frame, &time);
+	if (result != B_OK)
+		return result;
+		
+	result = fDecoder->Seek(seekTo, seekFrame, &frame, 0, &time);
+	if (result != B_OK)
+		return result;
+		
+	*inout_frame = frame;
+	fCurFrame = frame;
+	fCurTime = time;
 
 	return B_OK;
 }
@@ -168,11 +246,24 @@ BMediaTrack::FindKeyFrameForFrame(int64 *inout_frame,
 status_t
 BMediaTrack::ReadChunk(char **out_buffer,
 					   int32 *out_size,
-					   media_header *mh)
+					   media_header *mh /* = 0 */)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	if (!fExtractor)
+		return B_NO_INIT;
+	if (!out_buffer || !out_size)
+		return B_BAD_VALUE;
 
-	return B_OK;
+	status_t result;
+	media_header temp_header;
+	if (!mh)
+		mh = &temp_header;
+
+	result = fExtractor->GetNextChunk(fStream, (void **)out_buffer, out_size, mh);
+
+	fCurTime = mh->start_time;
+
+	return result;
 }
 
 
@@ -337,33 +428,36 @@ BMediaTrack::Perform(int32 selector,
  * private BMediaTrack
  *************************************************************/
 
-BMediaTrack::BMediaTrack(BPrivate::MediaExtractor *extractor,
+BMediaTrack::BMediaTrack(BPrivate::media::MediaExtractor *extractor,
 						 int32 stream)
 {
-	UNIMPLEMENTED();
+	CALLED();
+	fExtractor = extractor;
+	fStream = stream;
+	
+	if (B_OK != fExtractor->CreateDecoder(fStream, &fDecoder, &fMCI))
+		fDecoder = 0;
+
+	fCurFrame = 0;
+	fCurTime = 0;
+	fErr = B_OK;
+	
+	// not used:
+	fEncoder = 0;
+	fEncoderID = 0;
+	fWriter = 0;
 }
 
 
 BMediaTrack::BMediaTrack(BPrivate::MediaWriter *writer,
 						 int32 stream_num,
 						 media_format *in_format,
-						 BPrivate::Encoder *encoder,
+						 BPrivate::media::Encoder *encoder,
 						 media_codec_info *mci)
 {
 	UNIMPLEMENTED();
 }
 
-
-status_t
-BMediaTrack::TrackInfo(media_format *out_format,
-					   void **out_info,
-					   int32 *out_infoSize)
-{
-	UNIMPLEMENTED();
-
-	return B_ERROR;
-}
-
 /*
 // unimplemented
 BMediaTrack::BMediaTrack()
@@ -371,15 +465,6 @@ BMediaTrack::BMediaTrack(const BMediaTrack &)
 BMediaTrack &BMediaTrack::operator=(const BMediaTrack &)
 */
 
-BPrivate::Decoder *
-BMediaTrack::find_decoder(BMediaTrack *track,
-						  int32 *id)
-{
-	UNIMPLEMENTED();
-	return NULL;
-}
-
-
 status_t BMediaTrack::_Reserved_BMediaTrack_0(int32 arg, ...) { return B_ERROR; }
 status_t BMediaTrack::_Reserved_BMediaTrack_1(int32 arg, ...) { return B_ERROR; }
 status_t BMediaTrack::_Reserved_BMediaTrack_2(int32 arg, ...) { return B_ERROR; }