xref: /frameworks/av/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_FilterDeblockingChroma_HorEdge_I.c

/* ----------------------------------------------------------------
 *
 *
 * File Name:  omxVCM4P10_FilterDeblockingChroma_HorEdge_I.c
 * OpenMAX DL: v1.0.2
 * Revision:   9641
 * Date:       Thursday, February 7, 2008
 *
 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
 *
 *
 *
 * H.264 chroma deblock module
 *
 */

#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"

#include "armCOMM.h"
#include "armVC.h"

/**
 * Function:  omxVCM4P10_FilterDeblockingChroma_HorEdge_I   (6.3.3.3.4)
 *
 * Description:
 * Performs in-place deblock filtering on the horizontal edges of the chroma
 * macroblock (8x8).
 *
 * Input Arguments:
 *
 *   pSrcDst - pointer to the input macroblock; must be 8-byte aligned.
 *   srcdstStep - array step; must be a multiple of 8.
 *   pAlpha - array of size 2 containing alpha thresholds; the first element
 *            contains the threshold for the external horizontal edge, and the
 *            second element contains the threshold for internal horizontal
 *            edge.  Per [ISO14496-10] alpha values must be in the range
 *            [0,255].
 *   pBeta - array of size 2 containing beta thresholds; the first element
 *            contains the threshold for the external horizontal edge, and the
 *            second element contains the threshold for the internal
 *            horizontal edge.  Per [ISO14496-10] beta values must be in the
 *            range [0,18].
 *   pThresholds - array of size 8 containing thresholds, TC0, for the top
 *            horizontal edge of each 2x4 chroma block, arranged in horizontal
 *            block order; must be aligned on a 4-byte boundary.  Per
 *            [ISO14496-10] values must be in the range [0,25].
 *   pBS - array of size 16 containing BS parameters for each 2x2 chroma
 *            block, arranged in horizontal block order; valid in the range
 *            [0,4] with the following restrictions: i) pBS[i]== 4 may occur
 *            only for 0<=i<=3, ii) pBS[i]== 4 if and only if pBS[i^3]== 4.
 *            Must be 4-byte aligned.
 *
 * Output Arguments:
 *
 *   pSrcDst -Pointer to filtered output macroblock.
 *
 * Return Value:
 *
 *    OMX_Sts_NoErr, if the function runs without error.
 *
 *    OMX_Sts_BadArgErr, if one of the following cases occurs:
 *    -    any of the following pointers is NULL:
 *         pSrcDst, pAlpha, pBeta, pThresholds, or pBS.
 *    -    pSrcDst is not 8-byte aligned.
 *    -    srcdstStep is not a multiple of 8.
 *    -    pThresholds is not 4-byte aligned.
 *    -    pAlpha[0] and/or pAlpha[1] is outside the range [0,255].
 *    -    pBeta[0] and/or pBeta[1] is outside the range [0,18].
 *    -    One or more entries in the table pThresholds[0..7] is outside
 *         of the range [0,25].
 *    -    pBS is out of range, i.e., one of the following conditions is true:
 *              pBS[i]<0, pBS[i]>4, pBS[i]==4 for i>=4, or
 *              (pBS[i]==4 && pBS[i^3]!=4) for 0<=i<=3.
 *    -    pBS is not 4-byte aligned.
 *
 */

OMXResult omxVCM4P10_FilterDeblockingChroma_HorEdge_I(
     OMX_U8* pSrcDst,
     OMX_S32 srcdstStep,
     const OMX_U8* pAlpha,
     const OMX_U8* pBeta,
     const OMX_U8* pThresholds,
     const OMX_U8 *pBS
 )
{
    int I, X, Y, Internal=0;

    armRetArgErrIf(pSrcDst == NULL,                 OMX_Sts_BadArgErr);
    armRetArgErrIf(armNot8ByteAligned(pSrcDst),     OMX_Sts_BadArgErr);
    armRetArgErrIf(srcdstStep & 7,                  OMX_Sts_BadArgErr);
    armRetArgErrIf(pAlpha == NULL,                  OMX_Sts_BadArgErr);
    armRetArgErrIf(pBeta == NULL,                   OMX_Sts_BadArgErr);
    armRetArgErrIf(pThresholds == NULL,             OMX_Sts_BadArgErr);
    armRetArgErrIf(armNot4ByteAligned(pThresholds), OMX_Sts_BadArgErr);
    armRetArgErrIf(pBS == NULL,                     OMX_Sts_BadArgErr);
    armRetArgErrIf(armNot4ByteAligned(pBS),         OMX_Sts_BadArgErr);

    for (Y=0; Y<8; Y+=4, Internal=1)
    {
        for (X=0; X<8; X++)
        {
            I = (X>>1)+4*(Y>>1);

            armRetArgErrIf(pBS[I] > 4, OMX_Sts_BadArgErr)

            armRetArgErrIf( (I > 3) && (pBS[I] == 4),
                            OMX_Sts_BadArgErr)

            armRetArgErrIf( (I < 4)       &&
                          ( (pBS[I] == 4) && (pBS[I^1] != 4) ),
                            OMX_Sts_BadArgErr)


            /* Filter horizontal edge with q0 at (X,Y) */
            armVCM4P10_DeBlockPixel(
                pSrcDst + Y*srcdstStep + X,
                srcdstStep,
                pThresholds[(X>>1)+4*(Y>>2)],
                pAlpha[Internal],
                pBeta[Internal],
                pBS[I],
                1);
        }
    }

    return OMX_Sts_NoErr;
}