omxacaac_decodeprgcfgelt.c

The OpenMAX DL (Development Layer) APIs contain a comprehensive set of audio, video, signal processi

/**
 * 
 * File Name:  omxACAAC_DecodePrgCfgElt.c
 * OpenMAX DL: v1.0.2
 * Revision:   10586
 * Date:       Wednesday, March 5, 2008
 * 
 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
 * 
 * 
 *
 * Description:
 * This file contains module for parsing ADIF header information from AAC bitstream
 *
 */

#include "omxtypes.h"
#include "armOMX.h"
#include "omxAC.h"

#include "armCOMM.h"
#include "armCOMM_Bitstream.h"

/**
 * Function:  omxACAAC_DecodePrgCfgElt   (3.2.3.1.3)
 *
 * Description:
 * Unpacks one program configuration element (PCE) from the input bit stream 
 * and copies the contents into a PCE data structure. 
 *
 * Reference [ISO14496-3], sub-clause 4.5.1.2 
 *
 * Input Arguments:
 *   
 *   ppBitStream - double pointer to the current byte 
 *   pOffset - pointer to the bit position in the byte pointed by 
 *            *ppBitStream..  Valid within the range 0 to 7; 0: MS bit, 7: LS 
 *            bit. 
 *   pPrgCfgElt - pointer an uninitialized OMXACCPrgCfgElt structure 
 *
 * Output Arguments:
 *   
 *   ppBitStream - updated double pointer to the current byte after decoding 
 *            the PCE. 
 *   pOffset - pointer to the bit position in the byte pointed by 
 *            *ppBitStream. Valid within the range 0 to 7. 0: MS bit, 7: LS 
 *            bit. 
 *   pPrgCfgElt - pointer to updated OMXAACPrgCfgElt structure.  All 
 *            structures members are updated by the function to reflect the 
 *            contents of the program configuration element in the input 
 *            stream, with the following limitations:  i) the member 
 *            monoMixdownEltNum is updated only if monoMixdownPres==1, 
 *            otherwise it is set equal to 0; ii) the member 
 *            stereoMixdownEltNum is updated only if stereoMixdownPres==1, 
 *            otherwise it is set equal to 0; iii) the members 
 *            matrixMixdownIdx and pseudoSourroundEnable are updated only if 
 *            matrixMixdownIdxPres==1; iv) Only elements 0, 1,  , 
 *            numFrontElt-1 of the pFrontIsCpe and pFrontTagSel arrays are 
 *            updated; v) Only elements 0, 1,  , numSideElt-1 of the 
 *            pSideIsCpe and pSideTagSel arrays are updated; vi) Only elements 
 *            0, 1,  , numBackElt-1 of the pBackIsCpe and pBackTagSel arrays 
 *            are updated; vii) Only elements 0, 1,  , numLfeElt-1 of the 
 *            pLfeTagSel array are updated; viii) Only elements 0, 1,  , 
 *            numDataElt-1 of the pDataTagSel array are updated; ix) Only 
 *            elements 0, 1,  , numValidCcElt-1 of the pCceIsIndSw and 
 *            pCceTagSel arrays are updated; x) Only elements 0, 1,  , 
 *            numComBytes-1 of the pComFieldData array are updated 
 *
 * Return Value:
 *    
 *    OMX_Sts_NoErr - no error 
 *    OMX_Sts_BadArgErr - Bad arguments 
 *    -    At least one of the following pointers is NULL: ppBitStream, pOffset, 
 *              pPrgCfgElt, *ppBitStream  
 *    -   *pOffset exceeds [0, 7] 
 *
 */

OMXResult omxACAAC_DecodePrgCfgElt(
     const OMX_U8 **ppBitStream,
     OMX_INT *pOffset,
     OMXAACPrgCfgElt *pPrgCfgElt
 )
{

    OMX_INT i; 
    
    /* Argument Check */        
    armRetArgErrIf( ppBitStream == NULL, OMX_Sts_BadArgErr);
    armRetArgErrIf(*ppBitStream == NULL, OMX_Sts_BadArgErr);
    armRetArgErrIf( pOffset     == NULL, OMX_Sts_BadArgErr);
    armRetArgErrIf( pPrgCfgElt  == NULL, OMX_Sts_BadArgErr);
    
    armRetArgErrIf( (*pOffset > 7) || (*pOffset < 0), OMX_Sts_BadArgErr);

    /* Processing */
    pPrgCfgElt->eltInsTag           = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    pPrgCfgElt->profile             = (OMX_INT)armGetBits(ppBitStream,pOffset,2);
    pPrgCfgElt->samplingRateIndex   = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    pPrgCfgElt->numFrontElt         = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    pPrgCfgElt->numSideElt          = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    pPrgCfgElt->numBackElt          = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    pPrgCfgElt->numLfeElt           = (OMX_INT)armGetBits(ppBitStream,pOffset,2);
    pPrgCfgElt->numDataElt          = (OMX_INT)armGetBits(ppBitStream,pOffset,3);
    pPrgCfgElt->numValidCcElt       = (OMX_INT)armGetBits(ppBitStream,pOffset,4);

    pPrgCfgElt->monoMixdownPres     = (OMX_INT)armGetBits(ppBitStream,pOffset,1);

    if(pPrgCfgElt->monoMixdownPres == 1)
    {
        pPrgCfgElt->monoMixdownEltNum = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }

    pPrgCfgElt->stereoMixdownPres = (OMX_INT)armGetBits(ppBitStream,pOffset,1);

    if(pPrgCfgElt->stereoMixdownPres == 1)
    {
        pPrgCfgElt->stereoMixdownEltNum = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }

    pPrgCfgElt->matrixMixdownIdxPres = (OMX_INT)armGetBits(ppBitStream,pOffset,1);

    if(pPrgCfgElt->matrixMixdownIdxPres == 1)
    {
        pPrgCfgElt->matrixMixdownIdx = (OMX_INT)armGetBits(ppBitStream,pOffset,2);
        pPrgCfgElt->pseudoSurroundEnable = (OMX_INT)armGetBits(ppBitStream,pOffset,1);
    }

    for (i = 0; i < pPrgCfgElt->numFrontElt ; i++ ) 
    {
        pPrgCfgElt->pFrontIsCpe[i]  = (OMX_INT)armGetBits(ppBitStream,pOffset,1);
        pPrgCfgElt->pFrontTagSel[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }

    for (i = 0; i < pPrgCfgElt->numSideElt ; i++ )
    {
        pPrgCfgElt->pSideIsCpe[i]  = (OMX_INT)armGetBits(ppBitStream,pOffset,1);
        pPrgCfgElt->pSideTagSel[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }

    for (i = 0; i < pPrgCfgElt->numBackElt ; i++ )
    {
        pPrgCfgElt->pBackIsCpe[i]  = (OMX_INT)armGetBits(ppBitStream,pOffset,1);
        pPrgCfgElt->pBackTagSel[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }

    for (i = 0; i < pPrgCfgElt->numLfeElt ; i++ )
    {
        pPrgCfgElt->pLfeTagSel[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }
   
    for (i = 0; i < pPrgCfgElt->numDataElt ; i++ )
    {
        pPrgCfgElt->pDataTagSel[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }
   
    for (i = 0; i < pPrgCfgElt->numValidCcElt ; i++ )
    {
        pPrgCfgElt->pCceIsIndSw[i]  = (OMX_INT)armGetBits(ppBitStream,pOffset,1);
        pPrgCfgElt->pCceTagSel[i]   = (OMX_INT)armGetBits(ppBitStream,pOffset,4);
    }
    
    armByteAlign(ppBitStream,pOffset);
    
    pPrgCfgElt->numComBytes = (OMX_INT)armGetBits(ppBitStream,pOffset,8);
    
    for (i = 0; i < pPrgCfgElt->numComBytes ; i++ )
    {
        pPrgCfgElt->pComFieldData[i] = (OMX_INT)armGetBits(ppBitStream,pOffset,8);
    }

    return OMX_Sts_NoErr;

}
/* End of File */