10c1bc742181ded4930842b46e9507372f0b1b963James Dong/**
20c1bc742181ded4930842b46e9507372f0b1b963James Dong *
30c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name:  omxVCM4P2_QuantIntra_I.c
40c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2
50c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision:   9641
60c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date:       Thursday, February 7, 2008
70c1bc742181ded4930842b46e9507372f0b1b963James Dong *
80c1bc742181ded4930842b46e9507372f0b1b963James Dong * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
90c1bc742181ded4930842b46e9507372f0b1b963James Dong *
100c1bc742181ded4930842b46e9507372f0b1b963James Dong *
110c1bc742181ded4930842b46e9507372f0b1b963James Dong *
120c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description:
130c1bc742181ded4930842b46e9507372f0b1b963James Dong * Contains modules for intra Quantization
140c1bc742181ded4930842b46e9507372f0b1b963James Dong *
150c1bc742181ded4930842b46e9507372f0b1b963James Dong */
160c1bc742181ded4930842b46e9507372f0b1b963James Dong
170c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h"
180c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h"
190c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxVC.h"
200c1bc742181ded4930842b46e9507372f0b1b963James Dong
210c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armCOMM.h"
220c1bc742181ded4930842b46e9507372f0b1b963James Dong/**
230c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function:  omxVCM4P2_QuantIntra_I   (6.2.4.4.2)
240c1bc742181ded4930842b46e9507372f0b1b963James Dong *
250c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description:
260c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs quantization on intra block coefficients. This function supports
270c1bc742181ded4930842b46e9507372f0b1b963James Dong * bits_per_pixel == 8.
280c1bc742181ded4930842b46e9507372f0b1b963James Dong *
290c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments:
300c1bc742181ded4930842b46e9507372f0b1b963James Dong *
310c1bc742181ded4930842b46e9507372f0b1b963James Dong *   pSrcDst - pointer to the input intra block coefficients; must be aligned
320c1bc742181ded4930842b46e9507372f0b1b963James Dong *            on a 16-byte boundary.
330c1bc742181ded4930842b46e9507372f0b1b963James Dong *   QP - quantization parameter (quantizer_scale).
340c1bc742181ded4930842b46e9507372f0b1b963James Dong *   blockIndex - block index indicating the component type and position,
350c1bc742181ded4930842b46e9507372f0b1b963James Dong *            valid in the range 0 to 5, as defined in [ISO14496-2], subclause
360c1bc742181ded4930842b46e9507372f0b1b963James Dong *            6.1.3.8.
370c1bc742181ded4930842b46e9507372f0b1b963James Dong *   shortVideoHeader - binary flag indicating presence of
380c1bc742181ded4930842b46e9507372f0b1b963James Dong *            short_video_header; shortVideoHeader==1 selects linear intra DC
390c1bc742181ded4930842b46e9507372f0b1b963James Dong *            mode, and shortVideoHeader==0 selects non linear intra DC mode.
400c1bc742181ded4930842b46e9507372f0b1b963James Dong *
410c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments:
420c1bc742181ded4930842b46e9507372f0b1b963James Dong *
430c1bc742181ded4930842b46e9507372f0b1b963James Dong *   pSrcDst - pointer to the output (quantized) interblock coefficients.
440c1bc742181ded4930842b46e9507372f0b1b963James Dong *            When shortVideoHeader==1, AC coefficients are saturated on the
450c1bc742181ded4930842b46e9507372f0b1b963James Dong *            interval [-127, 127], and DC coefficients are saturated on the
460c1bc742181ded4930842b46e9507372f0b1b963James Dong *            interval [1, 254].  When shortVideoHeader==0, AC coefficients
470c1bc742181ded4930842b46e9507372f0b1b963James Dong *            are saturated on the interval [-2047, 2047].
480c1bc742181ded4930842b46e9507372f0b1b963James Dong *
490c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value:
500c1bc742181ded4930842b46e9507372f0b1b963James Dong *
510c1bc742181ded4930842b46e9507372f0b1b963James Dong *    OMX_Sts_NoErr - no error
520c1bc742181ded4930842b46e9507372f0b1b963James Dong *    OMX_Sts_BadArgErr - bad arguments:
530c1bc742181ded4930842b46e9507372f0b1b963James Dong *    -    pSrcDst is NULL.
540c1bc742181ded4930842b46e9507372f0b1b963James Dong *    -    blockIndex < 0 or blockIndex >= 10
550c1bc742181ded4930842b46e9507372f0b1b963James Dong *    -    QP <= 0 or QP >= 32.
560c1bc742181ded4930842b46e9507372f0b1b963James Dong *
570c1bc742181ded4930842b46e9507372f0b1b963James Dong */
580c1bc742181ded4930842b46e9507372f0b1b963James Dong
590c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P2_QuantIntra_I(
600c1bc742181ded4930842b46e9507372f0b1b963James Dong     OMX_S16 * pSrcDst,
610c1bc742181ded4930842b46e9507372f0b1b963James Dong     OMX_U8 QP,
620c1bc742181ded4930842b46e9507372f0b1b963James Dong     OMX_INT blockIndex,
630c1bc742181ded4930842b46e9507372f0b1b963James Dong	 OMX_INT shortVideoHeader
640c1bc742181ded4930842b46e9507372f0b1b963James Dong )
650c1bc742181ded4930842b46e9507372f0b1b963James Dong{
660c1bc742181ded4930842b46e9507372f0b1b963James Dong
670c1bc742181ded4930842b46e9507372f0b1b963James Dong    /* Definitions and Initializations*/
680c1bc742181ded4930842b46e9507372f0b1b963James Dong    /* Initialized to remove compilation error */
690c1bc742181ded4930842b46e9507372f0b1b963James Dong    OMX_INT dcScaler = 0, coeffCount,fSign;
700c1bc742181ded4930842b46e9507372f0b1b963James Dong    OMX_INT maxClpAC, minClpAC;
710c1bc742181ded4930842b46e9507372f0b1b963James Dong
720c1bc742181ded4930842b46e9507372f0b1b963James Dong    /* Argument error checks */
730c1bc742181ded4930842b46e9507372f0b1b963James Dong    armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr);
740c1bc742181ded4930842b46e9507372f0b1b963James Dong    armRetArgErrIf(((blockIndex < 0) || (blockIndex >= 10)), OMX_Sts_BadArgErr);
750c1bc742181ded4930842b46e9507372f0b1b963James Dong    armRetArgErrIf(((QP <= 0) || (QP >= 32)), OMX_Sts_BadArgErr);
760c1bc742181ded4930842b46e9507372f0b1b963James Dong   /* One argument check is delayed until we have ascertained that  */
770c1bc742181ded4930842b46e9507372f0b1b963James Dong   /* pQMatrix is not NULL.                                         */
780c1bc742181ded4930842b46e9507372f0b1b963James Dong
790c1bc742181ded4930842b46e9507372f0b1b963James Dong
800c1bc742181ded4930842b46e9507372f0b1b963James Dong    /* Set the Clip Range based on SVH on/off */
810c1bc742181ded4930842b46e9507372f0b1b963James Dong    if(shortVideoHeader == 1)
820c1bc742181ded4930842b46e9507372f0b1b963James Dong    {
830c1bc742181ded4930842b46e9507372f0b1b963James Dong        maxClpAC = 127;
840c1bc742181ded4930842b46e9507372f0b1b963James Dong        minClpAC = -127;
850c1bc742181ded4930842b46e9507372f0b1b963James Dong        dcScaler = 8;
860c1bc742181ded4930842b46e9507372f0b1b963James Dong        /* Dequant the DC value, this applies to both the methods */
870c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[0] = armIntDivAwayFromZero (pSrcDst[0], dcScaler);
880c1bc742181ded4930842b46e9507372f0b1b963James Dong
890c1bc742181ded4930842b46e9507372f0b1b963James Dong        /* Clip between 1 and 254 */
900c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[0] = (OMX_S16) armClip (1, 254, pSrcDst[0]);
910c1bc742181ded4930842b46e9507372f0b1b963James Dong    }
920c1bc742181ded4930842b46e9507372f0b1b963James Dong    else
930c1bc742181ded4930842b46e9507372f0b1b963James Dong    {
940c1bc742181ded4930842b46e9507372f0b1b963James Dong        maxClpAC = 2047;
950c1bc742181ded4930842b46e9507372f0b1b963James Dong        minClpAC = -2047;
960c1bc742181ded4930842b46e9507372f0b1b963James Dong        /* Calculate the DC scaler value */
970c1bc742181ded4930842b46e9507372f0b1b963James Dong        if ((blockIndex  < 4) || (blockIndex  > 5))
980c1bc742181ded4930842b46e9507372f0b1b963James Dong        {
990c1bc742181ded4930842b46e9507372f0b1b963James Dong            if (QP >= 1 && QP <= 4)
1000c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1010c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = 8;
1020c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1030c1bc742181ded4930842b46e9507372f0b1b963James Dong            else if (QP >= 5 && QP <= 8)
1040c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1050c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = 2 * QP;
1060c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1070c1bc742181ded4930842b46e9507372f0b1b963James Dong            else if (QP >= 9 && QP <= 24)
1080c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1090c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = QP + 8;
1100c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1110c1bc742181ded4930842b46e9507372f0b1b963James Dong            else
1120c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1130c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = (2 * QP) - 16;
1140c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1150c1bc742181ded4930842b46e9507372f0b1b963James Dong        }
1160c1bc742181ded4930842b46e9507372f0b1b963James Dong        else if (blockIndex < 6)
1170c1bc742181ded4930842b46e9507372f0b1b963James Dong        {
1180c1bc742181ded4930842b46e9507372f0b1b963James Dong            if (QP >= 1 && QP <= 4)
1190c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1200c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = 8;
1210c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1220c1bc742181ded4930842b46e9507372f0b1b963James Dong            else if (QP >= 5 && QP <= 24)
1230c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1240c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = (QP + 13)/2;
1250c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1260c1bc742181ded4930842b46e9507372f0b1b963James Dong            else
1270c1bc742181ded4930842b46e9507372f0b1b963James Dong            {
1280c1bc742181ded4930842b46e9507372f0b1b963James Dong                dcScaler = QP - 6;
1290c1bc742181ded4930842b46e9507372f0b1b963James Dong            }
1300c1bc742181ded4930842b46e9507372f0b1b963James Dong        }
1310c1bc742181ded4930842b46e9507372f0b1b963James Dong
1320c1bc742181ded4930842b46e9507372f0b1b963James Dong        /* Dequant the DC value, this applies to both the methods */
1330c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[0] = armIntDivAwayFromZero (pSrcDst[0], dcScaler);
1340c1bc742181ded4930842b46e9507372f0b1b963James Dong    }
1350c1bc742181ded4930842b46e9507372f0b1b963James Dong
1360c1bc742181ded4930842b46e9507372f0b1b963James Dong    /* Second Inverse quantisation method */
1370c1bc742181ded4930842b46e9507372f0b1b963James Dong    for (coeffCount = 1; coeffCount < 64; coeffCount++)
1380c1bc742181ded4930842b46e9507372f0b1b963James Dong    {
1390c1bc742181ded4930842b46e9507372f0b1b963James Dong        fSign =  armSignCheck (pSrcDst[coeffCount]);
1400c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[coeffCount] = armAbs(pSrcDst[coeffCount])/(2 * QP);
1410c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[coeffCount] *= fSign;
1420c1bc742181ded4930842b46e9507372f0b1b963James Dong
1430c1bc742181ded4930842b46e9507372f0b1b963James Dong        /* Clip */
1440c1bc742181ded4930842b46e9507372f0b1b963James Dong        pSrcDst[coeffCount] =
1450c1bc742181ded4930842b46e9507372f0b1b963James Dong        (OMX_S16) armClip (minClpAC, maxClpAC, pSrcDst[coeffCount]);
1460c1bc742181ded4930842b46e9507372f0b1b963James Dong    }
1470c1bc742181ded4930842b46e9507372f0b1b963James Dong    return OMX_Sts_NoErr;
1480c1bc742181ded4930842b46e9507372f0b1b963James Dong
1490c1bc742181ded4930842b46e9507372f0b1b963James Dong}
1500c1bc742181ded4930842b46e9507372f0b1b963James Dong
1510c1bc742181ded4930842b46e9507372f0b1b963James Dong/* End of file */
1520c1bc742181ded4930842b46e9507372f0b1b963James Dong
1530c1bc742181ded4930842b46e9507372f0b1b963James Dong
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