multimediacommscontroller/mmccshared/src/streamformatter.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:04:58 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2004-2005 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:    PayloadFormat plugin capable to read RTP payload containing
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*                AMR audio.
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*
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*/
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// INCLUDE FILES
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#include "streamformatter.h"
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// CONSTANTS
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const TInt KBitsIn4Bytes = 32;
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const TUint8 KZeroMask = 0xFF;
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const TInt KBitIndex7 = 7;
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// TStreamEncoder::Initialize
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// Initialize the stream encoder.
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// -----------------------------------------------------------------------------
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//
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void TStreamEncoder::Initialize( TUint8* aBuffer, TInt aByteIndex, TInt aBitIndex )
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    {
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    iBuffer = aBuffer;
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    iByteIndex = aByteIndex;
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    iBitIndex = aBitIndex;
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    };
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// -----------------------------------------------------------------------------
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// TStreamEncoder::Encode
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// Put a number of bit values ( up to 32 bits ) into the bit-stream buffer 
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// -----------------------------------------------------------------------------
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//
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void TStreamEncoder::Encode( TUint32 aValue, TInt aBitCount )
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    {
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    // Bit count has to be between 1 and 32 so if number of bits is out of range
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    // return from here
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    if ( aBitCount < 1 || aBitCount > KBitsIn4Bytes )
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        {
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        return;
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        }
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    TInt bitCount = aBitCount;
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    TInt vacantBits;
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    TInt bitsWritten;
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    TUint32 oldValue;
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    TUint32 newValue;
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    TUint8* p;
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    while ( bitCount > 0 )
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        {
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        p = iBuffer + iByteIndex;
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        vacantBits = KBitsIn1Byte - iBitIndex;
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        if ( bitCount >= vacantBits )
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            {
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            // get old value and zero out vacant bits
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            oldValue = ( *p ) & ( KZeroMask << vacantBits );
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            newValue = ( ( bitCount - vacantBits ) < KBitsIn4Bytes ) ?
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                 TUint8( ( aValue >> ( bitCount - vacantBits ) ) ) : 0;
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            bitsWritten = vacantBits;
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            }
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        else
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            {
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            oldValue = ( *p ) 
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                & ( ( KZeroMask << vacantBits ) 
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                | ( KZeroMask >> ( KBitsIn1Byte - vacantBits + bitCount ) ) );
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            newValue = TUint8( ( aValue << ( vacantBits-bitCount ) ) );
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            bitsWritten = bitCount;
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            }
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        // zero out unwanted bits
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        newValue &= ( KZeroMask ) >> ( iBitIndex );
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         // write the byte
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        *p = TUint8( ( oldValue | newValue ) );
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        // update variables
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        bitCount -= bitsWritten;
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        iBitIndex += bitsWritten;
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        if ( iBitIndex > KBitIndex7 )
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            {
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            iBitIndex &= KBitIndex7;
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            iByteIndex += 1;
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            }
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        }
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    };
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// -----------------------------------------------------------------------------
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// TStreamEncoder::Encode
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// Put a number of bit values into the bit-stream buffer at current location.
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// -----------------------------------------------------------------------------
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//
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void TStreamEncoder::Encode( const TUint8* aFromBuffer, TInt aFromByteIndex, 
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        TInt aFromBitIndex, TInt aBitCount )
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    {
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    if ( aFromBitIndex == 0 && iBitIndex == 0 )
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        {
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        // Mem::Copy is applicable
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        TUint8* desBuffer = iBuffer + iByteIndex;
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        const TUint8* srcBuffer = aFromBuffer + aFromByteIndex;
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        TInt byteLen = aBitCount / KBitsIn1Byte;
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        TInt bitsLeft = aBitCount % KBitsIn1Byte;
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        Mem::Copy( desBuffer, srcBuffer, byteLen );
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        iByteIndex += byteLen;
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        if ( bitsLeft != 0 )
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            {
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            TUint32 value;
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            TStreamDecoder decoder;
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            decoder.Initialize( aFromBuffer, aFromByteIndex + byteLen, aFromBitIndex );
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            value = decoder.Decode( bitsLeft );
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            Encode( value, bitsLeft );
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            }
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        return;
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        }
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    // Note that Mem::Copy is not applicable, have to do bit shifting
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    TInt bitFilled = 0;
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    TUint32 value;
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    TStreamDecoder decoder;
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    decoder.Initialize( aFromBuffer, aFromByteIndex, aFromBitIndex );
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    while ( bitFilled < aBitCount )
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        {
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        if ( aBitCount - bitFilled < KBitsIn4Bytes )
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            {
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            value = decoder.Decode( aBitCount - bitFilled );
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            Encode( value, ( aBitCount - bitFilled ) );
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            bitFilled = aBitCount;
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            }
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        else
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            {
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            value = decoder.Decode( KBitsIn4Bytes );
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            Encode( value, KBitsIn4Bytes );
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            bitFilled += KBitsIn4Bytes;
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            }
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        }
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    };
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// -----------------------------------------------------------------------------
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// TStreamDecoder::Initialize
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// Initialize the stream decoder.
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// -----------------------------------------------------------------------------
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//
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void TStreamDecoder::Initialize( const TUint8* aBuffer, TInt aByteIndex, 
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        TInt aBitIndex )
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    {
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    iBuffer = aBuffer;
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    iByteIndex = aByteIndex;
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    iBitIndex = aBitIndex;
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    };
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// -----------------------------------------------------------------------------
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// TStreamDecoder::Decode
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// Get a number of bit values ( up to 32 bits ) from the bit-stream buffer at 
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// current location.
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// -----------------------------------------------------------------------------
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//
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TUint32 TStreamDecoder::Decode( TInt aBitCount )
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    {
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    // Bit count has to be between 1 and 32 so if number of bits is out of range
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    // return from here
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    if ( aBitCount < 1 || aBitCount > KBitsIn4Bytes )
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        {
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        return 0;
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        }
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    TInt bitCount = aBitCount;
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    TInt availableBits;
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    TInt bitsRead;
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    TUint8* p;
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    TUint32 temp;
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    TUint32 value = 0;
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   194
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    while ( bitCount > 0 )
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        {
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        p = const_cast<TUint8*>( iBuffer ) + iByteIndex;
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        availableBits = KBitsIn1Byte - iBitIndex;
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   199
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        // read one byte and zero out unwanted bits
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        temp = ( *p ) & ( KZeroMask >> iBitIndex );
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   202
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        // update return value
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        if ( bitCount >= availableBits )
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            {
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            value = TUint8( temp ) | ( value<<availableBits );
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            bitsRead = availableBits;
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            }
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        else
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            {
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            value = TUint8( ( temp >> ( availableBits - bitCount ) ) ) | ( value << bitCount );
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            bitsRead = bitCount;
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            }
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        // update variables
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        bitCount -= bitsRead;
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        iBitIndex += bitsRead;
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        if ( iBitIndex > KBitIndex7 )
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            {
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            iBitIndex &= KBitIndex7;
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            iByteIndex += 1;
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            }
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        }
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    return value;
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    };
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// -----------------------------------------------------------------------------
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// TStreamDecoder::Decode
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// Get a number of byte values from the bit-stream buffer at current location.
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// -----------------------------------------------------------------------------
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//
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void TStreamDecoder::Decode( TUint8* aToBuffer, TInt aToByteIndex, 
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        TInt aToBitIndex, TInt aBitCount )
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    {
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    if ( aToBitIndex == 0 && iBitIndex == 0 )
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        {
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        // Mem::Copy is applicable
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        TUint8* desBuffer = aToBuffer + aToByteIndex;
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        const TUint8* srcBuffer = iBuffer + iByteIndex;
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        TInt byteLen = aBitCount / KBitsIn1Byte;
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        TInt bitsLeft = aBitCount % KBitsIn1Byte;
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        Mem::Copy( desBuffer, srcBuffer, byteLen );
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        iByteIndex += byteLen;
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        if ( bitsLeft != 0 )
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            {
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            TUint32 value;
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            TStreamEncoder encoder;
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            encoder.Initialize( aToBuffer, aToByteIndex + byteLen, aToBitIndex );
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            value = Decode( bitsLeft );
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            encoder.Encode( value, bitsLeft );
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            }
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        return;
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        }
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    // Note that Mem::Copy is not applicable, have to do bit shifting
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    TInt bitFilled = 0;
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    TUint32 value;
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    TStreamEncoder encoder;
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    encoder.Initialize( aToBuffer, aToByteIndex, aToBitIndex );
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    while ( bitFilled < aBitCount )
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        {
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        // Check if number of remaining bits is less than 32.
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        if ( aBitCount - bitFilled < KBitsIn4Bytes )
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            {
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            value = Decode( aBitCount - bitFilled );
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            encoder.Encode( value, ( aBitCount - bitFilled ) );
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            bitFilled = aBitCount;
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            }
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        else
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            {
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            value = Decode( KBitsIn4Bytes );
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            encoder.Encode( value, KBitsIn4Bytes );
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            bitFilled += KBitsIn4Bytes;
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            }
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        }
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    };
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// ========================== OTHER EXPORTED FUNCTIONS =========================
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//  End of File