inc/Mp3Codec.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:08:46 +0200
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/*
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 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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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 "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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 *
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 * Description: Telephony Multimedia Service
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 *
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 */
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#ifndef __MP3CODEC_H__
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#define __MP3CODEC_H__
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// INCLUDES
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#include <E32Base.h>
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// CONSTANTS
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// DATA TYPES
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// FORWARD DECLARATION
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class CMp3ToPcmDecoderImpl;
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// CLASS DEFINITIONS
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/*
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-----------------------------------------------------------------------------
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    TMp3DecParams
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    MP3 decoding parameters.
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    @since 2.1
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-----------------------------------------------------------------------------
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*/
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class TMp3DecParams
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    {
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public:
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    inline TMp3DecParams();
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public:
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    TInt iStereoToMono;    // stereo to mono switch (TRUE or default FALSE)
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    TInt iLeftRight;       // decode left or right channel (1 left, 2 right, 0 default all)
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    TInt iDecimFactor;     // decimation factor (2, 4 or default 1)
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    TInt iConcealment;     // error concealment level (0 none, default 1)
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    TInt iSampleLength;    // resolution of PCM samples (default 16 bits)
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    TInt iSamplingFrequency; //Output sampling frequency
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    };
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TMp3DecParams::TMp3DecParams() :
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iStereoToMono(0), iLeftRight(0), iDecimFactor(1), iConcealment(1), iSampleLength(16), iSamplingFrequency(0) {}
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/*
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-----------------------------------------------------------------------------
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    TMp3FrameInfo
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    MP3 frame info struct.
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    @since 2.1
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-----------------------------------------------------------------------------
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*/
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class TMp3FrameInfo
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    {
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public:
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    inline TMp3FrameInfo();
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public:
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    IMPORT_C static TInt MinFrameSize();
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    IMPORT_C static TInt MaxFrameSize();
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    IMPORT_C static TInt MaxFrameSamples();
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    IMPORT_C static TInt MaxChannels();
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    IMPORT_C static TInt MaxAncillaryBits();
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    IMPORT_C static TInt FrameHeaderSize();
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    IMPORT_C static TInt FrameSize(const TMp3FrameInfo& aInfo);
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public:
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    TInt iId;              // id of algorithm (1 MPEG-1, 0 MPEG-2)
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    TInt iLayer;           // layer number (1, 2, 3 or 4)
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    TInt iErrorProtection; // err prot flag (TRUE or FALSE, TRUE if err protected)
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    TInt iBitrate;         // bitrate (kbit/s)
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    TInt iSamplingRate;    // sampling frequency (Hz)
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    TInt iPadding;         // padding flag (TRUE or FALSE, TRUE if p slot exists)
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    TInt iPrivateBit;      // bit for private use
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    TInt iMode;            // audio mode (0 stereo, 1 jstereo, 2 dual, 3 mono)
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    TInt iChannels;        // number of audio channels (1 for mono, otherwise 2)
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    TInt iCopyright;       // copyright flag (TRUE or FALSE, TRUE if copyrighted)
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    TInt iOrigCopy;        // original flag (TRUE or FALSE, TRUE if original)
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    TInt iFrameSize;       // size of encoded frame (bytes)
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    TInt iFrameSamples;    // length of decoded frame (samples per channel)
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public:
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    TInt iSamplingRateOut; // sampling frequency after conversion(s) (Hz)
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    TInt iChannelsOut;     // number of audio channels after conversion(s) (1 or 2)
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    TInt iFrameSamplesOut; // length of decoded frame after conversion(s) (samples per channel)
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    };
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TMp3FrameInfo::TMp3FrameInfo() {}
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/*
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-----------------------------------------------------------------------------
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    CMp3ToPcmDecoder
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    Low level MP3 decoding API.
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    @since 2.1
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-----------------------------------------------------------------------------
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*/
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class CMp3ToPcmDecoder : public CBase
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    {
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protected:
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    IMPORT_C CMp3ToPcmDecoder();
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    IMPORT_C void ConstructL();
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public:
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    IMPORT_C static CMp3ToPcmDecoder* NewL(const TMp3DecParams& aConf);
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    IMPORT_C virtual ~CMp3ToPcmDecoder();
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    IMPORT_C void Reset();
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    IMPORT_C void Reset(const TMp3DecParams& aConf);
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    IMPORT_C static TInt FrameInfo(const TUint8* aBuf, TInt aBufLen, TMp3FrameInfo& aInfo);
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    IMPORT_C static TInt FrameInfo(const TUint8* aBuf, TInt aBufLen, TMp3FrameInfo& aInfo, const TMp3DecParams& aConf);
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    IMPORT_C static TInt SeekSync(const TUint8* aBuf, TInt aBufLen);
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    IMPORT_C TInt Decode(TUint8* aSrc, TInt& aSrcUsed, TUint8* aDst, TInt& aDstLen, TInt aMuteFlag);
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    IMPORT_C TInt Decode(TUint8* aSrc, TInt& aSrcUsed, TUint8* aDst1, TUint8* aDst2, TUint8* aDst3, TInt& aDstLen1,  TInt& aDstLen2,  TInt& aDstLen3, TInt aMuteFlag);
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private:
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    CMp3ToPcmDecoderImpl* iState;
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    };
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#endif //__MP3CODEC_H__
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//-----------------------------------------------------------------------------
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//  End of File
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//-----------------------------------------------------------------------------