1 /*

     2 * Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:    

    15 *                Amr audio.

    16 *

    17 */

    18 

    19 

    20 

    21 

    22 // INCLUDE FILES

    23 #include "amrpayloadheaderoa.h"

    24 #include "streamformatter.h"

    25 #include "amrcommonutil.h"

    26 

    27 // CONSTANTS

    28 

    29 

    30 // ============================ MEMBER FUNCTIONS =============================

    31 

    32 // ---------------------------------------------------------------------------

    33 // CAmrPayloadHeader::CAmrPayloadHeader

    34 // C++ default constructor can NOT contain any code, that

    35 // might leave.

    36 // ---------------------------------------------------------------------------

    37 //

    38 CAmrPayloadHeaderOA::CAmrPayloadHeaderOA() : CAmrPayloadHeader()

    39     {

    40     DP_AMR_ENCODE( "CAmrPayloadHeaderOA::CAmrPayloadHeaderOA" );        

    41     }

    42 

    43 

    44 // ---------------------------------------------------------------------------

    45 // CAmrPayloadHeaderOA::NewL

    46 // Two-phased constructor.

    47 // ---------------------------------------------------------------------------

    48 //

    49 CAmrPayloadHeaderOA* CAmrPayloadHeaderOA::NewL()

    50     {

    51     DP_AMR_ENCODE( "CAmrPayloadHeaderOA::NewL" );

    52     

    53     CAmrPayloadHeaderOA* self = new( ELeave ) CAmrPayloadHeaderOA( );

    54 

    55     return self;

    56     }

    57 

    58 

    59 // Destructor

    60 CAmrPayloadHeaderOA::~CAmrPayloadHeaderOA()

    61     {

    62     DP_AMR_ENCODE( "CAmrPayloadHeaderOA::~CAmrPayloadHeaderOA" );

    63     }

    64     

    65     

    66 // ---------------------------------------------------------------------------

    67 // CAmrPayloadHeaderOA::Encode

    68 // Encode the payload header fields into a given buffer at the given position.

    69 // ---------------------------------------------------------------------------

    70 //

    71 void CAmrPayloadHeaderOA::Encode( TUint8* aBuffer, 

    72         TInt& aByteIndex, TInt& aBitIndex )

    73     {

    74     DP_AMR_ENCODE( "CAmrPayloadHeaderOA::Encode" );

    75         

    76     //In octet-aligned mode, the payload header consists of a 4 bit CMR, 4

    77     //reserved bits, and optionally, an 8 bit interleaving header, as shown

    78     //below:

    79     //    0                   1

    80     //    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5

    81     //   +-+-+-+-+-+-+-+-+- - - - - - - -

    82     //   |  CMR  |R|R|R|R|  ILL  |  ILP  |

    83     //   +-+-+-+-+-+-+-+-+- - - - - - - -

    84     // ILL and ILP are optional, PoC is not supporting these two fields.

    85 

    86     // Call base-class Encoder function

    87     CAmrPayloadHeader::Encode( aBuffer, aByteIndex, aBitIndex ); 

    88 

    89     TStreamEncoder encoder;

    90     encoder.Initialize( aBuffer, aByteIndex, aBitIndex );

    91     encoder.Encode( 0, KNumValue4 ); // 4 Reserved bits

    92 

    93     // Update Byte and Bit positions

    94     aByteIndex = encoder.ByteIndex( );

    95     aBitIndex = encoder.BitIndex( );

    96     }

    97 

    98 

    99 // ---------------------------------------------------------------------------

   100 // CAmrPayloadHeaderOA::Decode

   101 // Decode the payload header from a given buffer at the given position.

   102 // ---------------------------------------------------------------------------

   103 //

   104 void CAmrPayloadHeaderOA::Decode( const TUint8* aBuffer, 

   105     TInt& aByteIndex, TInt& aBitIndex )

   106     {

   107     DP_AMR_ENCODE( "CAmrPayloadHeaderOA::Decode" );

   108         

   109     // Call base-class Decoder function

   110     CAmrPayloadHeader::Decode( aBuffer, aByteIndex, aBitIndex );

   111 

   112     TStreamDecoder decoder;

   113     decoder.Initialize( aBuffer, aByteIndex, aBitIndex );

   114     decoder.Decode( KNumValue4 );    // skip 4 Reserved bits

   115 

   116     // Update Byte and Bit positions

   117     aByteIndex = decoder.ByteIndex( );

   118     aBitIndex = decoder.BitIndex( );

   119     }