winamp/Src/mpeg4dec/mp4decvops.c

/* ///////////////////////////////////////////////////////////////////////
//
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (c) 2001-2007 Intel Corporation. All Rights Reserved.
//
//  Description:    Decodes S-VOPs
//
*/

#include "mp4def.h"
#include "mp4dec.h"

/*
//  decode MPEG-4 SVOP
*/
mp4_Status mp4_DecodeVOP_S(mp4_Info* pInfo)
{
    __ALIGN16(int16_t, coeffMB, 64*6);
    int32_t          quant, quantPred, i, j, dcVLC, nmb, dx, dy, pat;
    int32_t          stepYr, stepYc, stepCbr, stepCbc, stepCrr, stepCrc, mbPerRow, mbPerCol;
    int32_t          mbCurr, mbInVideoPacket, colNum, rowNum, stepF[6];
    uint8_t           *pYc, *pCbc, *pCrc, *pYr, *pCbr, *pCrr, *pF[6];
    int32_t          mb_not_coded, mb_type, cbpc, cbpy, ac_pred_flag, cbpyPrev, mcsel;
    int32_t          scan, obmc_disable, rt, quarter_sample, interlaced, fcode_forward;
    IppiRect        limitRectL, limitRectC;
    IppMotionVector mvCur[4], mvPrev[4], mvTmp[4], mvCbCr;
    mp4_MacroBlock *pMBinfo;
    IppiRect        spriteRect, vopRect;
    mp4_Status      sts;

				if (!pInfo->VisualObject.cFrame)
					pInfo->VisualObject.cFrame = CreateFrame(&pInfo->VisualObject);

    mbPerRow = pInfo->VisualObject.VideoObject.MacroBlockPerRow;
    mbPerCol = pInfo->VisualObject.VideoObject.MacroBlockPerCol;
    stepYc = pInfo->VisualObject.cFrame->stepY;
    stepYr = pInfo->VisualObject.rFrame->stepY;
    stepCbc = pInfo->VisualObject.cFrame->stepCb;
    stepCbr = pInfo->VisualObject.rFrame->stepCb;
    stepCrc = pInfo->VisualObject.cFrame->stepCr;
    stepCrr = pInfo->VisualObject.rFrame->stepCr;
    pYc = pInfo->VisualObject.cFrame->pY;
    pCbc = pInfo->VisualObject.cFrame->pCb;
    pCrc = pInfo->VisualObject.cFrame->pCr;
    pYr = pInfo->VisualObject.rFrame->pY;
    pCbr = pInfo->VisualObject.rFrame->pCb;
    pCrr = pInfo->VisualObject.rFrame->pCr;
    stepF[0] = stepF[1] = stepF[2] = stepF[3] = stepYc; stepF[4] = stepCbc; stepF[5] = stepCrc;
    // Bounding rectangle for MV limitation
    limitRectL.x = - 16 * MP4_NUM_EXT_MB;
    limitRectL.y = - 16 * MP4_NUM_EXT_MB;
    limitRectL.width = pInfo->VisualObject.VideoObject.width + 16 * 2 * MP4_NUM_EXT_MB;
    limitRectL.height = pInfo->VisualObject.VideoObject.height + 16 * 2 * MP4_NUM_EXT_MB;
    limitRectC.x = -8 * MP4_NUM_EXT_MB;
    limitRectC.y = -8 * MP4_NUM_EXT_MB;
    limitRectC.width = (pInfo->VisualObject.VideoObject.width >> 1) + 8 * 2 * MP4_NUM_EXT_MB;
    limitRectC.height = (pInfo->VisualObject.VideoObject.height >> 1) + 8 * 2 * MP4_NUM_EXT_MB;
    pMBinfo = pInfo->VisualObject.VideoObject.MBinfo;
    rt = pInfo->VisualObject.VideoObject.VideoObjectPlane.rounding_type;
    quarter_sample = pInfo->VisualObject.VideoObject.quarter_sample;
    obmc_disable = pInfo->VisualObject.VideoObject.obmc_disable;
    interlaced = pInfo->VisualObject.VideoObject.interlaced;
    scan = pInfo->VisualObject.VideoObject.VideoObjectPlane.alternate_vertical_scan_flag ? IPPVC_SCAN_VERTICAL : IPPVC_SCAN_ZIGZAG;
    nmb = pInfo->VisualObject.VideoObject.MacroBlockPerVOP;
    quant = quantPred = pInfo->VisualObject.VideoObject.VideoObjectPlane.quant;
    mbCurr = colNum = rowNum = 0;
    cbpc = 0;
    // init WarpSpec for Sprites or GMC
    vopRect.x = 0;
    vopRect.y = 0;
    vopRect.width = pInfo->VisualObject.VideoObject.width;
    vopRect.height = pInfo->VisualObject.VideoObject.height;
    if (pInfo->VisualObject.VideoObject.sprite_enable == MP4_SPRITE_STATIC) {
        spriteRect.x = pInfo->VisualObject.VideoObject.sprite_left_coordinate;
        spriteRect.y = pInfo->VisualObject.VideoObject.sprite_top_coordinate;
        spriteRect.width = pInfo->VisualObject.VideoObject.sprite_width;
        spriteRect.height = pInfo->VisualObject.VideoObject.sprite_height;
        fcode_forward = 1;
    } else {
        spriteRect = vopRect; // for shapes they may be different !!!!!!
        fcode_forward = pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_forward;
    }
    ippiWarpInit_MPEG4(pInfo->VisualObject.VideoObject.WarpSpec,
                       pInfo->VisualObject.VideoObject.VideoObjectPlane.warping_mv_code_du,
                       pInfo->VisualObject.VideoObject.VideoObjectPlane.warping_mv_code_dv,
                       pInfo->VisualObject.VideoObject.sprite_warping_points,
                       pInfo->VisualObject.VideoObject.sprite_enable,
                       pInfo->VisualObject.VideoObject.sprite_warping_accuracy,
                       rt, quarter_sample, fcode_forward,
                       &spriteRect, &vopRect);
// decode basic sprites
    if (pInfo->VisualObject.VideoObject.sprite_enable == MP4_SPRITE_STATIC) 
		{
        //if (pInfo->VisualObject.VideoObject.shape != MP4_SHAPE_TYPE_RECTANGULAR) {
        //    if (mp4_InitVOPShape(pInfo) != MP4_STATUS_OK)
        //        return MP4_STATUS_ERROR;
        //}
        ippiWarpLuma_MPEG4_8u_C1R(pInfo->VisualObject.sFrame->pY, pInfo->VisualObject.sFrame->stepY,
                                  pYc, stepYc, &vopRect, pInfo->VisualObject.VideoObject.WarpSpec);
        if (pInfo->VisualObject.VideoObject.sprite_brightness_change)
            ippiChangeSpriteBrightness_MPEG4_8u_C1IR(pYc, stepYc, vopRect.width, vopRect.height, pInfo->VisualObject.VideoObject.VideoObjectPlane.brightness_change_factor);
        vopRect.width >>= 1;  vopRect.height >>= 1;
        ippiWarpChroma_MPEG4_8u_P2R(pInfo->VisualObject.sFrame->pCb, pInfo->VisualObject.sFrame->stepCb,
                                    pInfo->VisualObject.sFrame->pCr, pInfo->VisualObject.sFrame->stepCr,
                                    pCbc, stepCbc, pCrc, stepCrc, &vopRect, pInfo->VisualObject.VideoObject.WarpSpec);
        return MP4_STATUS_OK;
    }
    sts = MP4_STATUS_OK;
// decode data_partitioned S(GMC)-VOP
    if (pInfo->VisualObject.VideoObject.data_partitioned) {
        for (;;) {
            mp4_DataPartMacroBlock *pMBdp;
            int32_t  x, y;

            x = colNum;
            y = rowNum;
            // reset Intra prediction buffer on new Video_packet
            mp4_ResetIntraPredBuffer(pInfo);
            pMBdp = &pInfo->VisualObject.VideoObject.DataPartBuff[mbCurr];
            pMBinfo = &pInfo->VisualObject.VideoObject.MBinfo[mbCurr];
            mbInVideoPacket = 0;
            // decode not_coded/mcsel/mb_type/cbpc/MV part
            for (;;) {
                mb_not_coded = mp4_GetBit(pInfo);
                if (mb_not_coded) {
                    mb_type = IPPVC_MBTYPE_INTER;
                    mp4_StatisticInc_(&pInfo->VisualObject.Statistic.nMB_NOTCODED);
                } else {
                    if (mp4_DecodeMCBPC_P(pInfo, &mb_type, &cbpc, 1) != MP4_STATUS_OK)
                        goto Err_2;
                }
                if (mb_type != IPPVC_MB_STUFFING) {
                    if (mbInVideoPacket == nmb - mbCurr) {
                        mp4_Error("DC Marker missed");
                        goto Err_2;
                    }
                    pMBinfo->validPred = 1;
                    if (mb_type < IPPVC_MBTYPE_INTER4V && !mb_not_coded)
                        mcsel = mp4_GetBit(pInfo);
                    else
                        mcsel = mb_not_coded;
                    if (!mcsel) {
                        if (mb_type <= IPPVC_MBTYPE_INTER4V) {
                            if (mb_type != IPPVC_MBTYPE_INTER4V) {
                                if (mp4_PredictDecode1MV(pInfo, pMBinfo, y, x) != MP4_STATUS_OK)
                                    goto Err_2;
                                pMBinfo->mv[1] = pMBinfo->mv[2] = pMBinfo->mv[3] = pMBinfo->mv[0];
                            } else {
                                if (mp4_PredictDecode4MV(pInfo, pMBinfo, y, x) != MP4_STATUS_OK)
                                    goto Err_2;
                            }
                        } else {
                            mp4_Zero4MV(pMBinfo->mv);
                        }
                    } else {
                        ippiCalcGlobalMV_MPEG4(x << 4, y << 4, pMBinfo->mv, pInfo->VisualObject.VideoObject.WarpSpec);
                        pMBinfo->mv[1] = pMBinfo->mv[2] = pMBinfo->mv[3] = pMBinfo->mv[0];
                    }
                    pMBinfo->not_coded = (uint8_t)mb_not_coded;
                    pMBinfo->type = (uint8_t)mb_type;
                    pMBinfo ++;
                    pMBdp->pat = (uint8_t)cbpc;
                    pMBdp->mcsel = (uint8_t)mcsel;
                    pMBdp ++;
                    mbInVideoPacket ++;
                    x ++;
                    if (x == mbPerRow) {
                        x = 0;
                        y ++;
                    }
                }
                if (mp4_ShowBits(pInfo, 17) == MP4_MV_MARKER) {
                    mp4_GetBits(pInfo, 17);
                    break;
                }
            }
            pMBdp = &pInfo->VisualObject.VideoObject.DataPartBuff[mbCurr];
            pMBinfo = &pInfo->VisualObject.VideoObject.MBinfo[mbCurr];
            // decode ac_pred_flag/cbpy/dquant/IntraDC part
            for (i = 0; i < mbInVideoPacket; i ++) {
                if (!pMBinfo->not_coded) {
                    mb_type = pMBinfo->type;
                    if (mb_type >= IPPVC_MBTYPE_INTRA)
                        pMBdp->ac_pred_flag = (uint8_t)mp4_GetBit(pInfo);
                    if (mp4_DecodeCBPY_P(pInfo, &cbpy, mb_type) != MP4_STATUS_OK)
                        goto Err_2;
                    pMBdp->pat = (uint8_t)((cbpy << 2) + pMBdp->pat);
                    quantPred = quant;
                    if (mb_type == IPPVC_MBTYPE_INTER_Q || mb_type == IPPVC_MBTYPE_INTRA_Q)
                        mp4_UpdateQuant(pInfo, quant);
                    pMBdp->quant = (uint8_t)quant;
                    if (i == 0)
                        quantPred = quant;
                    // decode DC coefficient of Intra blocks
                    dcVLC = (quantPred < mp4_DC_vlc_Threshold[pInfo->VisualObject.VideoObject.VideoObjectPlane.intra_dc_vlc_thr]) ? 1 : 0;
                    if ((mb_type >= IPPVC_MBTYPE_INTRA) && dcVLC) {
                        for (j = 0; j < 6; j ++) {
                            if (ippiDecodeDCIntra_MPEG4_1u16s(&pInfo->bufptr, &pInfo->bitoff, &pMBdp->dct_dc[j], j < 4 ? IPPVC_BLOCK_LUMA : IPPVC_BLOCK_CHROMA) != ippStsNoErr)
                                goto Err_2;
                        }
                    }
                } else
                    pMBdp->pat = 0;
                pMBinfo->not_coded = 0;  // for B-VOP all MB have MVs
                if (pMBdp->mcsel)
                    pMBinfo->type = IPPVC_MBTYPE_INTRA;  // for OBMC MVs
                pMBdp ++;
                pMBinfo ++;
            }
            if (mbCurr + mbInVideoPacket < nmb)
                pMBinfo->type = IPPVC_MBTYPE_INTRA;  // for OBMC set first MB of the next videopacket as invalid for right MV
            pMBdp = &pInfo->VisualObject.VideoObject.DataPartBuff[mbCurr];
            pMBinfo = &pInfo->VisualObject.VideoObject.MBinfo[mbCurr];
            // decode coeffs and reconstruct macroblocks
            for (i = 0; i < mbInVideoPacket; i ++) {
                if (colNum == 0) {
                    // reset B-prediction blocks on new row
                    mp4_ResetIntraPredBblock(pInfo);
                }
                quant = pMBdp->quant;
                mb_type = pMBinfo->type;
                mcsel = pMBdp->mcsel;
                if (!mcsel && (mb_type >= IPPVC_MBTYPE_INTRA)) {
                    quantPred = (i == 0) ? quant : pMBdp[-1].quant;
                    dcVLC = (quantPred < mp4_DC_vlc_Threshold[pInfo->VisualObject.VideoObject.VideoObjectPlane.intra_dc_vlc_thr]) ? 1 : 0;
                    pF[0] = pYc; pF[1] = pYc + 8; pF[2] = pYc + 8 * stepYc; pF[3] = pYc + 8 * stepYc + 8; pF[4] = pCbc; pF[5] = pCrc;
                    if (mp4_DecodeIntraMB_DP(pInfo, pMBdp->dct_dc, colNum, pMBdp->pat, quant, dcVLC, pMBdp->ac_pred_flag, pF, stepF) != MP4_STATUS_OK)
                        goto Err_2;
                } else {
                    mp4_UpdateIntraPredBuffInvalid(pInfo, colNum);
                    dx = colNum * 16;
                    dy = rowNum * 16;
                    pat = pMBdp->pat;
                    cbpy = pat >> 2;
                    cbpc = pat & 3;
                    if (pat)
                        if (mp4_DecodeInterMB(pInfo, coeffMB, quant, pat, scan) != MP4_STATUS_OK)
                            goto Err_2;
                    if (!mcsel) {
                        if (mb_type == IPPVC_MBTYPE_INTER4V) {
                            if (quarter_sample) {
                                mp4_Limit4MVQ(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 8);
                                mp4_ComputeChroma4MVQ(pMBinfo->mv, &mvCbCr);
                            } else {
                                mp4_Limit4MV(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 8);
                                mp4_ComputeChroma4MV(pMBinfo->mv, &mvCbCr);
                            }
                            mp4_LimitMV(&mvCbCr, &mvCbCr, &limitRectC, dx >> 1, dy >> 1, 8);
                        } else {
                            if (quarter_sample) {
                                mp4_LimitMVQ(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 16);
                                mp4_ComputeChromaMVQ(mvCur, &mvCbCr);
                            } else {
                                mp4_LimitMV(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 16);
                                mp4_ComputeChromaMV(mvCur, &mvCbCr);
                            }
                            mvCur[1] = mvCur[2] = mvCur[3] = mvCur[0];
                        }
                        if (obmc_disable) {
                            if (quarter_sample) {
                                if (mb_type == IPPVC_MBTYPE_INTER4V) {
                                    mp4_Copy8x8QP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                    mp4_Copy8x8QP_8u(pYr+8, stepYr, pYc+8, stepYc, &mvCur[1], rt);
                                    mp4_Copy8x8QP_8u(pYr+8*stepYr, stepYr, pYc+8*stepYc, stepYc, &mvCur[2], rt);
                                    mp4_Copy8x8QP_8u(pYr+8*stepYr+8, stepYr, pYc+8*stepYc+8, stepYc, &mvCur[3], rt);
                                } else
                                    mp4_Copy16x16QP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                            } else {
                                if (mb_type == IPPVC_MBTYPE_INTER4V) {
                                    mp4_Copy8x8HP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                    mp4_Copy8x8HP_8u(pYr+8, stepYr, pYc+8, stepYc, &mvCur[1], rt);
                                    mp4_Copy8x8HP_8u(pYr+8*stepYr, stepYr, pYc+8*stepYc, stepYc, &mvCur[2], rt);
                                    mp4_Copy8x8HP_8u(pYr+8*stepYr+8, stepYr, pYc+8*stepYc+8, stepYc, &mvCur[3], rt);
                                } else
                                    mp4_Copy16x16HP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                            }
                            mp4_AddResidual(cbpy & 8, pYc, stepYc, coeffMB);
                            mp4_AddResidual(cbpy & 4, pYc+8, stepYc, coeffMB+64);
                            mp4_AddResidual(cbpy & 2, pYc+stepYc*8, stepYc, coeffMB+128);
                            mp4_AddResidual(cbpy & 1, pYc+stepYc*8+8, stepYc, coeffMB+192);
                        } else {
                            mp4_OBMC(pInfo, pMBinfo, mvCur, colNum, rowNum, limitRectL, pYc, stepYc, pYr, stepYr, cbpy, coeffMB, 0);
                        }
                        mp4_MC_HP(cbpc & 2, pCbr, stepCbr, pCbc, stepCbc, coeffMB+256, &mvCbCr, rt);
                        mp4_MC_HP(cbpc & 1, pCrr, stepCrr, pCrc, stepCrc, coeffMB+320, &mvCbCr, rt);
                    } else {
                        IppiRect  mbRect;

                        mbRect.x = dx;  mbRect.y = dy;  mbRect.width = mbRect.height = 16;
                        ippiWarpLuma_MPEG4_8u_C1R(pInfo->VisualObject.rFrame->pY, stepYr, pYc, stepYc, &mbRect, pInfo->VisualObject.VideoObject.WarpSpec);
                        mbRect.x >>= 1;  mbRect.y >>= 1;  mbRect.width = mbRect.height = 8;
                        ippiWarpChroma_MPEG4_8u_P2R(pInfo->VisualObject.rFrame->pCb, stepCbr, pInfo->VisualObject.rFrame->pCr, stepCrr, pCbc, stepCbc, pCrc, stepCrc, &mbRect, pInfo->VisualObject.VideoObject.WarpSpec);
                        if (pat) {
                            mp4_AddResidual(cbpy & 8, pYc, stepYc, coeffMB);
                            mp4_AddResidual(cbpy & 4, pYc+8, stepYc, coeffMB+64);
                            mp4_AddResidual(cbpy & 2, pYc+stepYc*8, stepYc, coeffMB+128);
                            mp4_AddResidual(cbpy & 1, pYc+stepYc*8+8, stepYc, coeffMB+192);
                            mp4_AddResidual(cbpc & 2, pCbc, stepCbc, coeffMB+256);
                            mp4_AddResidual(cbpc & 1, pCrc, stepCrc, coeffMB+320);
                        }
                    }
                }
                pMBinfo ++;
                pMBdp ++;
                colNum ++;
                if (colNum == mbPerRow) {
                    colNum = 0;
                    rowNum ++;
                    if (rowNum == mbPerCol)
                        return sts;
                    pYc += (2 * MP4_NUM_EXT_MB + 1) * 16 + (stepYc << 4) - stepYc;
                    pCbc += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCbc << 3) - stepCbc;
                    pCrc += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCrc << 3) - stepCrc;
                    pYr += (2 * MP4_NUM_EXT_MB + 1) * 16 + (stepYr << 4) - stepYr;
                    pCbr += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCbr << 3) - stepCbr;
                    pCrr += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCrr << 3) - stepCrr;
                } 
								else 
								{
                    pYc += 16; pCrc += 8; pCbc += 8;
                    pYr += 16; pCrr += 8; pCbr += 8;
                }
            }
            //mbCurr += mbInVideoPacket;
            if (!pInfo->VisualObject.VideoObject.resync_marker_disable)
						{
                int32_t  found;
ErrRet_2:
                if (mp4_CheckDecodeVideoPacket(pInfo, &found) == MP4_STATUS_OK) 
								{
                    if (found)
										{
                        quant = pInfo->VisualObject.VideoObject.VideoObjectPlane.quant_scale;
                        mbInVideoPacket = pInfo->VisualObject.VideoObject.VideoObjectPlane.macroblock_num - mbCurr;
                        mbCurr = pInfo->VisualObject.VideoObject.VideoObjectPlane.macroblock_num;
                        mp4_CopyMacroBlocks(pInfo->VisualObject.rFrame, pInfo->VisualObject.cFrame, mbPerRow, rowNum, colNum, mbCurr - rowNum * mbPerRow - colNum);
                        rowNum = mbCurr / mbPerRow;
                        colNum = mbCurr % mbPerRow;
                        pYc = pInfo->VisualObject.cFrame->pY + (rowNum * stepYc + colNum) * 16; pCbc = pInfo->VisualObject.cFrame->pCb + (rowNum * stepCbc + colNum) * 8; pCrc = pInfo->VisualObject.cFrame->pCr + (rowNum * stepCrc + colNum) * 8;
                        pYr = pInfo->VisualObject.rFrame->pY + (rowNum * stepYr + colNum) * 16; pCbr = pInfo->VisualObject.rFrame->pCb + (rowNum * stepCbr + colNum) * 8; pCrr = pInfo->VisualObject.rFrame->pCr + (rowNum * stepCrr + colNum) * 8;
                        pMBinfo = pInfo->VisualObject.VideoObject.MBinfo + mbCurr;
                    } else
                        goto Err_2;
                } else
                    goto Err_2;
            }
            // mark MBs the previous videopacket as invalid for prediction
            for (i = 1; i <= IPP_MIN(mbInVideoPacket, mbPerRow + 1); i ++)
                pMBinfo[-i].validPred = 0;
        }
Err_2:
        sts = MP4_STATUS_ERROR;
        if (pInfo->stopOnErr)
            return sts;
        if (pInfo->VisualObject.VideoObject.resync_marker_disable || !mp4_SeekResyncMarker(pInfo)) 
				{
            mp4_CopyMacroBlocks(pInfo->VisualObject.rFrame, pInfo->VisualObject.cFrame, mbPerRow, rowNum, colNum,  pInfo->VisualObject.VideoObject.MacroBlockPerVOP - rowNum * mbPerRow - colNum);
            return sts;
        }
        goto ErrRet_2;
    }
// decode not data_partitioned S-VOP
    {
        int32_t  stepY, pYoff23, field_prediction, dct_type, dct_typePrev, mb_ftfr, mb_fbfr;
        IppMotionVector mvCbCrT, mvCbCrB, *mvField = pInfo->VisualObject.VideoObject.FieldMV;

        // warning "variable may be used without having been initialized"
        dx = dy = ac_pred_flag = cbpy = cbpyPrev = field_prediction = dct_type = dct_typePrev = mb_ftfr = mb_fbfr = 0;
        mvCbCr.dx = mvCbCr.dy = mvCbCrT.dx = mvCbCrT.dy = mvCbCrB.dx = mvCbCrB.dy = 0;
        for (;;) {
            // reset Intra prediction buffer on new Video_packet
            mp4_ResetIntraPredBuffer(pInfo);
            mbInVideoPacket = 0;
            // decode blocks
            for (;;) {
                if (colNum == 0) {
                    // reset B-prediction blocks on new row
                    mp4_ResetIntraPredBblock(pInfo);
                }
                mb_not_coded = mp4_GetBit(pInfo);
                mb_type = IPPVC_MBTYPE_INTER;
                if (!mb_not_coded) {
                    if (mp4_DecodeMCBPC_P(pInfo, &mb_type, &cbpc, 1) != MP4_STATUS_OK)
                        goto Err_3;
                }
                if (mb_type != IPPVC_MB_STUFFING) {
                    if (!mb_not_coded) {
                        mcsel = (mb_type < IPPVC_MBTYPE_INTER4V) ? mp4_GetBit(pInfo) : 0;
                        if (mb_type >= IPPVC_MBTYPE_INTRA)
                            ac_pred_flag = mp4_GetBit(pInfo);
                        if (mp4_DecodeCBPY_P(pInfo, &cbpy, mb_type) != MP4_STATUS_OK)
                            goto Err_3;
                        quantPred = quant;
                        if (mb_type == IPPVC_MBTYPE_INTER_Q || mb_type == IPPVC_MBTYPE_INTRA_Q)
                            mp4_UpdateQuant(pInfo, quant);
                        if (interlaced) {
                            dct_type = 0;
                            field_prediction = 0;
                            if (mb_type >= IPPVC_MBTYPE_INTRA || (cbpy + cbpc) != 0)
                                dct_type = mp4_GetBit(pInfo);
                            if ((mb_type == IPPVC_MBTYPE_INTER || mb_type == IPPVC_MBTYPE_INTER_Q) && !mcsel) {
                                field_prediction = mp4_GetBit(pInfo);
                                if (field_prediction) {
                                    mb_ftfr = mp4_GetBit(pInfo);
                                    mb_fbfr = mp4_GetBit(pInfo);
                                }
                            }
                        }
                    } else {
                        mp4_StatisticInc_(&pInfo->VisualObject.Statistic.nMB_NOTCODED);
                        mcsel = 1;
                        field_prediction = 0;
                    }
                    pMBinfo->validPred = 1;
                    pMBinfo->not_coded = 0;  // for B-VOP all MB have MVs
                    pMBinfo->type = (uint8_t)(mcsel ? IPPVC_MBTYPE_INTRA : mb_type);  // for OBMC MVs
                    pMBinfo->field_info = (uint8_t)(field_prediction + (mb_ftfr << 1) + (mb_fbfr << 2));
                    if (mb_type >= IPPVC_MBTYPE_INTRA) {
                        if (mbInVideoPacket == 0)
                            quantPred = quant;
                        dcVLC = (quantPred < mp4_DC_vlc_Threshold[pInfo->VisualObject.VideoObject.VideoObjectPlane.intra_dc_vlc_thr]) ? 1 : 0;
                        if (dct_type) {
                            stepY = stepYc * 2;
                            pYoff23 = stepYc;
                        } else {
                            stepY = stepYc;
                            pYoff23 = 8 * stepYc;
                        }
                        stepF[0] = stepF[1] = stepF[2] = stepF[3] = stepY;
                        pF[0] = pYc; pF[1] = pYc + 8; pF[2] = pYc + pYoff23; pF[3] = pYc + pYoff23 + 8; pF[4] = pCbc; pF[5] = pCrc;
                        if (mp4_DecodeIntraMB(pInfo, colNum, (cbpy << 2) + cbpc, quant, dcVLC, ac_pred_flag, pF, stepF) != MP4_STATUS_OK)
                            goto Err_3;
                        mp4_Zero4MV(pMBinfo->mv);
                    } else {
                        mp4_UpdateIntraPredBuffInvalid(pInfo, colNum);
                        dx = colNum * 16;
                        dy = rowNum * 16;
                        if (!mcsel) {
                            if (!field_prediction) {
                                if (mb_type != IPPVC_MBTYPE_INTER4V) {
                                    if (mp4_PredictDecode1MV(pInfo, pMBinfo, rowNum, colNum) != MP4_STATUS_OK)
                                        goto Err_3;
                                    pMBinfo->mv[1] = pMBinfo->mv[2] = pMBinfo->mv[3] = pMBinfo->mv[0];
                                    if (quarter_sample) {
                                        mp4_LimitMVQ(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 16);
                                        mp4_ComputeChromaMVQ(mvCur, &mvCbCr);
                                    } else {
                                        mp4_LimitMV(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 16);
                                        mp4_ComputeChromaMV(mvCur, &mvCbCr);
                                    }
                                    mvCur[1] = mvCur[2] = mvCur[3] = mvCur[0];
                                } else {
                                    if (mp4_PredictDecode4MV(pInfo, pMBinfo, rowNum, colNum) != MP4_STATUS_OK)
                                        goto Err_3;
                                    if (quarter_sample) {
                                        mp4_Limit4MVQ(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 8);
                                        mp4_ComputeChroma4MVQ(pMBinfo->mv, &mvCbCr);
                                    } else {
                                        mp4_Limit4MV(pMBinfo->mv, mvCur, &limitRectL, dx, dy, 8);
                                        mp4_ComputeChroma4MV(pMBinfo->mv, &mvCbCr);
                                    }
                                    mp4_LimitMV(&mvCbCr, &mvCbCr, &limitRectC, dx >> 1, dy >> 1, 8);
                                }
                            } else {
                                IppMotionVector  mvFT, mvFB;
                                if (mp4_PredictDecodeFMV(pInfo, pMBinfo, rowNum, colNum, &mvFT, &mvFB) != MP4_STATUS_OK)
                                    goto Err_3;
                                mvField[0] = mvFT; mvField[1] = mvFB;
                                if (quarter_sample) {
                                    mp4_LimitFMVQ(&mvFT, &mvCur[0], &limitRectL, dx, dy, 16);
                                    mp4_LimitFMVQ(&mvFB, &mvCur[2], &limitRectL, dx, dy, 16);
                                    mvTmp[0].dx = (int16_t)mp4_Div2(mvCur[0].dx);
                                    mvTmp[0].dy = (int16_t)(mp4_Div2(mvCur[0].dy << 1) >> 1);
                                    mvTmp[2].dx = (int16_t)mp4_Div2(mvCur[2].dx);
                                    mvTmp[2].dy = (int16_t)(mp4_Div2(mvCur[2].dy << 1) >> 1);
                                    mp4_ComputeChromaMV(&mvTmp[0], &mvCbCrT);
                                    mp4_ComputeChromaMV(&mvTmp[2], &mvCbCrB);
                                } else {
                                    mp4_LimitFMV(&mvFT, &mvCur[0], &limitRectL, dx, dy, 16);
                                    mp4_LimitFMV(&mvFB, &mvCur[2], &limitRectL, dx, dy, 16);
                                    mp4_ComputeChromaMV(&mvCur[0], &mvCbCrT);
                                    mp4_ComputeChromaMV(&mvCur[2], &mvCbCrB);
                                }
                            }
                        } else {
                            ippiCalcGlobalMV_MPEG4(dx, dy, pMBinfo->mv, pInfo->VisualObject.VideoObject.WarpSpec);
                            pMBinfo->mv[1] = pMBinfo->mv[2] = pMBinfo->mv[3] = pMBinfo->mv[0];
                        }
                    }
                    if (!obmc_disable) {
                        // OBMC for previous MB
                        if (colNum > 0)
                            if (pMBinfo[-1].type < IPPVC_MBTYPE_INTRA && !(pMBinfo[-1].field_info & 1)) // previous is marked as INTRA if it was mcsel
                                mp4_OBMC(pInfo, pMBinfo - 1, mvPrev, colNum - 1, rowNum, limitRectL, pYc - 16, stepYc, pYr - 16, stepYr, cbpyPrev, coeffMB, dct_typePrev);
                        if (mb_type < IPPVC_MBTYPE_INTRA && !field_prediction && !mcsel) {
                            cbpyPrev = cbpy;
                            dct_typePrev = dct_type;
                            mvPrev[0] = mvCur[0]; mvPrev[1] = mvCur[1]; mvPrev[2] = mvCur[2]; mvPrev[3] = mvCur[3];
                            if (mp4_DecodeInterMB(pInfo, coeffMB, quant, (cbpy << 2) + cbpc, scan) != MP4_STATUS_OK)
                                goto Err_3;
                            mp4_MC_HP(cbpc & 2, pCbr, stepCbr, pCbc, stepCbc, coeffMB+256, &mvCbCr, rt);
                            mp4_MC_HP(cbpc & 1, pCrr, stepCrr, pCrc, stepCrc, coeffMB+320, &mvCbCr, rt);
                            // OBMC current MB if it is the last in the row
                            if (colNum == mbPerRow - 1)
                                mp4_OBMC(pInfo, pMBinfo, mvPrev, colNum, rowNum, limitRectL, pYc, stepYc, pYr, stepYr, cbpyPrev, coeffMB, dct_typePrev);
                        }
                    }
                    if (mb_type < IPPVC_MBTYPE_INTRA && (obmc_disable || field_prediction || mcsel)) {
                        pat = mb_not_coded ? 0 : ((cbpy << 2) + cbpc);
                        if (pat)
                            if (mp4_DecodeInterMB(pInfo, coeffMB, quant, pat, scan) != MP4_STATUS_OK)
                                goto Err_3;
                        if (!mcsel) {
                            if (quarter_sample) {
                                if (!field_prediction) {
                                    if (mb_type == IPPVC_MBTYPE_INTER4V) {
                                        mp4_Copy8x8QP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                        mp4_Copy8x8QP_8u(pYr+8, stepYr, pYc+8, stepYc, &mvCur[1], rt);
                                        mp4_Copy8x8QP_8u(pYr+stepYr*8, stepYr, pYc+stepYc*8, stepYc, &mvCur[2], rt);
                                        mp4_Copy8x8QP_8u(pYr+8+stepYr*8, stepYr, pYc+8+stepYc*8, stepYc, &mvCur[3], rt);
                                    } else {
                                        mp4_Copy16x16QP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                    }
                                } else {
                                    mp4_Copy16x8QP_8u(pYr+stepYr*mb_ftfr, stepYr*2, pYc, stepYc*2, &mvCur[0], rt);
                                    mp4_Copy16x8QP_8u(pYr+stepYr*mb_fbfr, stepYr*2, pYc+stepYc, stepYc*2, &mvCur[2], rt);
                                }
                            } else {
                                if (!field_prediction) {
                                    if (mb_type == IPPVC_MBTYPE_INTER4V) {
                                        mp4_Copy8x8HP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                        mp4_Copy8x8HP_8u(pYr+8, stepYr, pYc+8, stepYc, &mvCur[1], rt);
                                        mp4_Copy8x8HP_8u(pYr+stepYr*8, stepYr, pYc+stepYc*8, stepYc, &mvCur[2], rt);
                                        mp4_Copy8x8HP_8u(pYr+8+stepYr*8, stepYr, pYc+8+stepYc*8, stepYc, &mvCur[3], rt);
                                    } else {
                                        mp4_Copy16x16HP_8u(pYr, stepYr, pYc, stepYc, &mvCur[0], rt);
                                    }
                                } else {
                                    mp4_Copy16x8HP_8u(pYr+stepYr*mb_ftfr, stepYr*2, pYc, stepYc*2, &mvCur[0], rt);
                                    mp4_Copy16x8HP_8u(pYr+stepYr*mb_fbfr, stepYr*2, pYc+stepYc, stepYc*2, &mvCur[2], rt);
                                }
                            }
                            if (!dct_type) {
                                mp4_AddResidual(cbpy & 8, pYc, stepYc, coeffMB);
                                mp4_AddResidual(cbpy & 4, pYc+8, stepYc, coeffMB+64);
                                mp4_AddResidual(cbpy & 2, pYc+stepYc*8, stepYc, coeffMB+128);
                                mp4_AddResidual(cbpy & 1, pYc+stepYc*8+8, stepYc, coeffMB+192);
                            } else {
                                mp4_AddResidual(cbpy & 8, pYc, stepYc*2, coeffMB);
                                mp4_AddResidual(cbpy & 4, pYc+8, stepYc*2, coeffMB+64);
                                mp4_AddResidual(cbpy & 2, pYc+stepYc, stepYc*2, coeffMB+128);
                                mp4_AddResidual(cbpy & 1, pYc+stepYc+8, stepYc*2, coeffMB+192);
                            }
                            if (!field_prediction) {
                                mp4_MC_HP(cbpc & 2, pCbr, stepCbr, pCbc, stepCbc, coeffMB+256, &mvCbCr, rt);
                                mp4_MC_HP(cbpc & 1, pCrr, stepCrr, pCrc, stepCrc, coeffMB+320, &mvCbCr, rt);
                            } else {
                                mp4_Copy8x4HP_8u(pCbr+(mb_ftfr ? stepCbr : 0), stepCbr*2, pCbc, stepCbc*2, &mvCbCrT, rt);
                                mp4_Copy8x4HP_8u(pCrr+(mb_ftfr ? stepCrr : 0), stepCrr*2, pCrc, stepCrc*2, &mvCbCrT, rt);
                                mp4_Copy8x4HP_8u(pCbr+(mb_fbfr ? stepCbr : 0), stepCbr*2, pCbc+stepCbc, stepCbc*2, &mvCbCrB, rt);
                                mp4_Copy8x4HP_8u(pCrr+(mb_fbfr ? stepCrr : 0), stepCrr*2, pCrc+stepCrc, stepCrc*2, &mvCbCrB, rt);
                                mp4_AddResidual(cbpc & 2, pCbc, stepCbc, coeffMB+256);
                                mp4_AddResidual(cbpc & 1, pCrc, stepCrc, coeffMB+320);
                            }
                        } else {
                            IppiRect  mbRect;

                            mbRect.x = dx;  mbRect.y = dy;  mbRect.width = mbRect.height = 16;
                            ippiWarpLuma_MPEG4_8u_C1R(pInfo->VisualObject.rFrame->pY, stepYr, pYc, stepYc, &mbRect, pInfo->VisualObject.VideoObject.WarpSpec);
                            mbRect.x >>= 1;  mbRect.y >>= 1;  mbRect.width = mbRect.height = 8;
                            ippiWarpChroma_MPEG4_8u_P2R(pInfo->VisualObject.rFrame->pCb, stepCbr, pInfo->VisualObject.rFrame->pCr, stepCrr, pCbc, stepCbc, pCrc, stepCrc, &mbRect, pInfo->VisualObject.VideoObject.WarpSpec);
                            if (pat) {
                                if (!dct_type) {
                                    mp4_AddResidual(cbpy & 8, pYc, stepYc, coeffMB);
                                    mp4_AddResidual(cbpy & 4, pYc+8, stepYc, coeffMB+64);
                                    mp4_AddResidual(cbpy & 2, pYc+stepYc*8, stepYc, coeffMB+128);
                                    mp4_AddResidual(cbpy & 1, pYc+stepYc*8+8, stepYc, coeffMB+192);
                                } else {
                                    mp4_AddResidual(cbpy & 8, pYc, stepYc*2, coeffMB);
                                    mp4_AddResidual(cbpy & 4, pYc+8, stepYc*2, coeffMB+64);
                                    mp4_AddResidual(cbpy & 2, pYc+stepYc, stepYc*2, coeffMB+128);
                                    mp4_AddResidual(cbpy & 1, pYc+stepYc+8, stepYc*2, coeffMB+192);
                                }
                                mp4_AddResidual(cbpc & 2, pCbc, stepCbc, coeffMB+256);
                                mp4_AddResidual(cbpc & 1, pCrc, stepCrc, coeffMB+320);
                            }
                        }
                    }
                    pMBinfo ++;
                    mvField += 2;
                    mbInVideoPacket ++;
                    colNum ++;
                    if (colNum == mbPerRow) {
                        colNum = 0;
                        rowNum ++;
                        if (rowNum == mbPerCol) {
                            // skip stuffing
                            while (mp4_ShowBits(pInfo, 10) == 1)
                                mp4_FlushBits(pInfo, 10);
                            return sts;
                        }
                        pYc += (2 * MP4_NUM_EXT_MB + 1) * 16 + (stepYc << 4) - stepYc;
                        pCbc += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCbc << 3) - stepCbc;
                        pCrc += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCrc << 3) - stepCrc;
                        pYr += (2 * MP4_NUM_EXT_MB + 1) * 16 + (stepYr << 4) - stepYr;
                        pCbr += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCbr << 3) - stepCbr;
                        pCrr += (2 * MP4_NUM_EXT_MB + 1) * 8 + (stepCrr << 3) - stepCrr;
                    } else {
                        pYc += 16; pCrc += 8; pCbc += 8;
                        pYr += 16; pCrr += 8; pCbr += 8;
                    }
                }
                if (!pInfo->VisualObject.VideoObject.resync_marker_disable) {
                    int32_t  found;
ErrRet_3:
                    if (mp4_CheckDecodeVideoPacket(pInfo, &found) == MP4_STATUS_OK) {
                        if (found) {
                            mbInVideoPacket = pInfo->VisualObject.VideoObject.VideoObjectPlane.macroblock_num - mbCurr;
                            quant = pInfo->VisualObject.VideoObject.VideoObjectPlane.quant_scale;
                            mbCurr = pInfo->VisualObject.VideoObject.VideoObjectPlane.macroblock_num;
                            mp4_CopyMacroBlocks(pInfo->VisualObject.rFrame, pInfo->VisualObject.cFrame, mbPerRow, rowNum, colNum, mbCurr - rowNum * mbPerRow - colNum);
                            rowNum = mbCurr / mbPerRow;
                            colNum = mbCurr % mbPerRow;
                            pYc = pInfo->VisualObject.cFrame->pY + (rowNum * stepYc + colNum) * 16; pCbc = pInfo->VisualObject.cFrame->pCb + (rowNum * stepCbc + colNum) * 8; pCrc = pInfo->VisualObject.cFrame->pCr + (rowNum * stepCrc + colNum) * 8;
                            pYr = pInfo->VisualObject.rFrame->pY + (rowNum * stepYr + colNum) * 16; pCbr = pInfo->VisualObject.rFrame->pCb + (rowNum * stepCbr + colNum) * 8; pCrr = pInfo->VisualObject.rFrame->pCr + (rowNum * stepCrr + colNum) * 8;
                            pMBinfo = pInfo->VisualObject.VideoObject.MBinfo + mbCurr;
                            mvField = pInfo->VisualObject.VideoObject.FieldMV + 2 * mbCurr;
                            break;
                        }
                    } else
                        goto Err_3;
                }
            }
            // mark MBs the previous videopacket as invalid for prediction
            for (i = 1; i <= IPP_MIN(mbInVideoPacket, mbPerRow + 1); i ++) {
                pMBinfo[-i].validPred = 0;
            }
        }
Err_3:
        sts = MP4_STATUS_ERROR;
        if (pInfo->stopOnErr)
            return sts;
        if (pInfo->VisualObject.VideoObject.resync_marker_disable || !mp4_SeekResyncMarker(pInfo)) {
            mp4_CopyMacroBlocks(pInfo->VisualObject.rFrame, pInfo->VisualObject.cFrame, mbPerRow, rowNum, colNum,  pInfo->VisualObject.VideoObject.MacroBlockPerVOP - rowNum * mbPerRow - colNum);
            return sts;
        }
        goto ErrRet_3;
    }
}