author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Ixonos Plc. |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - Initial contribution |
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* |
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* Contributors: |
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* Ixonos Plc |
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* |
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* Description: |
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* Header for VOL header parser. |
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* |
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*/ |
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#ifndef __VEDVOLREADER_H__ |
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#define __VEDVOLREADER_H__ |
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// INCLUDES |
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#include <e32base.h> |
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#include <e32std.h> |
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#include <vedcommon.h> |
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// DATA TYPES |
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/** |
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* Structure for the Video Object Layer header data |
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*/ |
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struct TVolHeader |
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{ |
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TInt iProfileLevelId; // Indicates the Level Id (0,1,2,3,4,8 or 9) of the Simple |
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// Profile the Video Object conforms to |
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TInt iVoPriority; // Priority assigned to the Video Object |
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// a value between 1(lowest)-7(highest). |
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// If not in the bitstream, set to zero |
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TInt iVoId; // id of the Video Object |
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TInt iVolId; // id of the Video Object Layer |
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TInt iRandomAccessibleVol;// set to 1 if all the VOPs in the stream are I-VOP. |
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TInt iPixelAspectRatio; // see MPEG-4 visual spec. pp. 71 |
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TInt iTimeIncrementResolution; |
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// Resolution to interpret the time_increment |
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// fields in the VOP headers |
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TInt iLumWidth; // Frame width of the Y component in pixels |
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TInt iLumHeight; // Frame height of the Y component in pixels |
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TUint8 iErrorResDisable; // Flag ON if no resynchronization markers are |
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// used inside frames. |
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// When OFF it doesn't mean they ARE used. |
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TUint8 iDataPartitioned; // Flag indicating if data partitioning inside |
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// a VP is used or not. |
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TUint8 iReversibleVlc; // flag indicating the usage of reversible |
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// VLC codes |
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// the following parameters concern the input video signal, |
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// see MPEG-4 visual spec. pp. 66-70, and "Note" in viddemux_mpeg.c |
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// Not used in the current implementatnion. |
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TInt iVideoFormat; |
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TInt iVideoRange; |
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TInt iColourPrimaries; |
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TInt iTransferCharacteristics; |
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TInt iMatrixCoefficients; |
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// the following parameters are used in the Video Buffering Verifier |
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// (Annex D) to monitor the input bit buffer, complexity, memory buffer |
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// used in the decoding process. The conformance of a stream can be checked |
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// using these parameters. |
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// Not used in the current implementatnion. |
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TUint32 iBitRate; |
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TUint32 iVbvBufferSize; |
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TUint32 iVbvOccupancy; |
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HBufC8* iUserData; // User Data if available |
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}; |
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// CLASS DECLARATION |
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/** |
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* A class for parsing the Video Object Layer header |
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*/ |
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class CVedVolReader : public CBase |
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{ |
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public: |
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/** |
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* Two-phased constructor. |
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*/ |
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IMPORT_C static CVedVolReader* NewL(); |
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/** |
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* Destructor. |
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*/ |
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virtual ~CVedVolReader(); |
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/** |
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* Parses given Video Object Layer header |
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* @param aData Buffer from where to parse the header |
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* @return error code |
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*/ |
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IMPORT_C TInt ParseVolHeaderL(TDesC8& aData); |
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/** |
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* Returns the time increment resolution that was read from the VOL header |
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* @return time increment resolution |
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*/ |
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IMPORT_C TInt TimeIncrementResolution() const; |
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/** |
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* Returns the width of the video that was read from the VOL header |
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* @return width |
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*/ |
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IMPORT_C TInt Width() const; |
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/** |
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* Returns the height of the video that was read from the VOL header |
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* @return height |
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*/ |
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IMPORT_C TInt Height() const; |
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/** |
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* Returns the Level Id of the Simple Profile the Video Object conforms to |
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* @return profile level Id |
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*/ |
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IMPORT_C TInt ProfileLevelId() const; |
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/** |
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* Returns the bitstream mode of the video |
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* @return bitstream mode |
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*/ |
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IMPORT_C TVedVideoBitstreamMode BitstreamMode() const; |
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/** |
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* Returns the size of the VOL header |
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* @return size of the header |
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*/ |
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IMPORT_C TInt HeaderSize() const; |
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private: |
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* Structure for internal buffer of the header sequence |
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struct TSeqHeaderBuffer |
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{ |
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TDesC8& iData; // The actual data of the buffer |
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TInt iGetIndex; // Index of getting from the buffer |
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TInt iBitInOctet; // Bit index in the buffer |
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TSeqHeaderBuffer(TDesC8& aData, TInt aGetIndex, TInt aBitInOctet) : |
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iData(aData), iGetIndex(aGetIndex), iBitInOctet(aBitInOctet) {} |
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}; |
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/** |
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* C++ default constructor. |
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CVedVolReader(); |
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/** |
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* By default Symbian OS constructor is private. |
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*/ |
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void ConstructL(); |
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/** |
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* Reads requested bits from given buffer |
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* @param aBuffer Buffer from where to read the bits |
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* @param aNumBits Amount of bits to read |
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* @param aFlush Discard the bits that were read |
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* @return The bits that were read |
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*/ |
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TUint32 ReadSeqHeaderBits(TSeqHeaderBuffer& aBuffer, TInt aNumBits, TBool aFlush); |
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/** |
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* Reads user data from given buffer |
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* @param aBuffer Buffer from where to read the user data |
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*/ |
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void ReadUserDataL(TSeqHeaderBuffer& aBuffer); |
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/** |
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* Checks what is the bit stream mode the video |
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* @param aErd Flag error resilience disable used |
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* @param aDp Flag data partitioned used |
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* @param aRvlc Flag reversible vlc used |
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* @return The bit stream mode |
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*/ |
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TVedVideoBitstreamMode CheckBitstreamMode(TUint8 aErd, TUint8 aDp, TUint8 aRvlc); |
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private: |
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// Member variables |
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static const TInt KMaxUserDataLength; // The maximum allocated memory for |
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// user data (UD). Only this much of the UD |
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// from the bitstream is stored |
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static const TUint8 KMsbMask[8]; // Mask for extracting the needed bits |
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static const TUint8 KLsbMask[9]; |
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TVolHeader iHeader; // For storing the header data |
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TVedVideoBitstreamMode iBitstreamMode; |
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TInt iHeaderSize; |
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}; |
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#endif // __VEDVOLREADER_H__ |
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