sample_common/src/brc_routines.cpp

/******************************************************************************\
Copyright (c) 2005-2019, Intel Corporation
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

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This sample was distributed or derived from the Intel's Media Samples package.
The original version of this sample may be obtained from https://software.intel.com/en-us/intel-media-server-studio
or https://software.intel.com/en-us/media-client-solutions-support.
\**********************************************************************************/


#include "brc_routines.h"
#include "math.h"
#include "mfxdefs.h"
#include <algorithm>

#ifndef MFX_VERSION
#error MFX_VERSION not defined
#endif

#if (MFX_VERSION >= 1024)
#define BRC_SCENE_CHANGE_RATIO1 20.0
#define BRC_SCENE_CHANGE_RATIO2 5.0

mfxExtBuffer* Hevc_GetExtBuffer(mfxExtBuffer** extBuf, mfxU32 numExtBuf, mfxU32 id)
{
    if (extBuf != 0)
    {
        for (mfxU16 i = 0; i < numExtBuf; i++)
        {
            if (extBuf[i] != 0 && extBuf[i]->BufferId == id) // assuming aligned buffers
                return (extBuf[i]);
        }
    }

    return nullptr;
}

mfxStatus cBRCParams::Init(mfxVideoParam* par, bool bFielMode)
{
    printf("Sample BRC is used\n");
    MFX_CHECK_NULL_PTR1(par);
    MFX_CHECK(par->mfx.RateControlMethod == MFX_RATECONTROL_CBR ||
              par->mfx.RateControlMethod == MFX_RATECONTROL_VBR,
              MFX_ERR_UNDEFINED_BEHAVIOR);

    mfxU32 k = par->mfx.BRCParamMultiplier == 0 ?  1: par->mfx.BRCParamMultiplier;
    mfxU32 bpsScale  = (par->mfx.CodecId == MFX_CODEC_AVC) ? 10 : 6;

    rateControlMethod  = par->mfx.RateControlMethod;
    targetbps = (((k*par->mfx.TargetKbps*1000) >> bpsScale) << bpsScale);
    maxbps    = (((k*par->mfx.MaxKbps   *1000) >> bpsScale) << bpsScale);

    maxbps = (par->mfx.RateControlMethod == MFX_RATECONTROL_CBR) ?
        targetbps : ((maxbps >= targetbps) ? maxbps : targetbps);
    mfxExtCodingOption * pExtCO = (mfxExtCodingOption*)Hevc_GetExtBuffer(par->ExtParam, par->NumExtParam, MFX_EXTBUFF_CODING_OPTION);

    HRDConformance = MFX_BRC_NO_HRD;
    if (pExtCO)
    {
        if ((MFX_CODINGOPTION_OFF != pExtCO->NalHrdConformance) && (MFX_CODINGOPTION_OFF != pExtCO->VuiNalHrdParameters))
            HRDConformance = MFX_BRC_HRD_STRONG;
        else if ((MFX_CODINGOPTION_ON == pExtCO->NalHrdConformance) && (MFX_CODINGOPTION_OFF == pExtCO->VuiNalHrdParameters))
            HRDConformance = MFX_BRC_HRD_WEAK;
    }

    if (HRDConformance != MFX_BRC_NO_HRD)
    {
        bufferSizeInBytes   = ((k*par->mfx.BufferSizeInKB  *1000) >> 3) << 3;
        initialDelayInBytes = ((k*par->mfx.InitialDelayInKB*1000) >> 3) << 3;
        bRec = 1;
        bPanic = (HRDConformance == MFX_BRC_HRD_STRONG) ? 1 : 0;
    }
    MFX_CHECK (par->mfx.FrameInfo.FrameRateExtD != 0 &&
               par->mfx.FrameInfo.FrameRateExtN != 0,
               MFX_ERR_UNDEFINED_BEHAVIOR);

    frameRate = (mfxF64)par->mfx.FrameInfo.FrameRateExtN / (mfxF64)par->mfx.FrameInfo.FrameRateExtD;

    width  = par->mfx.FrameInfo.Width;
    height = par->mfx.FrameInfo.Height;

    chromaFormat = par->mfx.FrameInfo.ChromaFormat == 0 ?  MFX_CHROMAFORMAT_YUV420 : par->mfx.FrameInfo.ChromaFormat ;
    bitDepthLuma = par->mfx.FrameInfo.BitDepthLuma == 0 ?  8 : par->mfx.FrameInfo.BitDepthLuma;
    quantOffset  = 6 * (bitDepthLuma - 8);

    inputBitsPerFrame    = targetbps / frameRate;
    maxInputBitsPerFrame = maxbps / frameRate;
    gopPicSize = par->mfx.GopPicSize*(bFielMode ? 2 : 1);
    gopRefDist = par->mfx.GopRefDist*(bFielMode ? 2 : 1);

    mfxExtCodingOption2 * pExtCO2 = (mfxExtCodingOption2*)Hevc_GetExtBuffer(par->ExtParam, par->NumExtParam, MFX_EXTBUFF_CODING_OPTION2);
    bPyr = (pExtCO2 && pExtCO2->BRefType == MFX_B_REF_PYRAMID);
    maxFrameSizeInBits  = pExtCO2 ? pExtCO2->MaxFrameSize*8 : 0;
    fAbPeriodLong  = 100;
    fAbPeriodShort = 5;
    dqAbPeriod = 100;
    bAbPeriod = 100;

    if (maxFrameSizeInBits)
    {
        bRec = 1;
        bPanic = 1;
    }

    if (pExtCO2
        && pExtCO2->MaxQPI <=51 && pExtCO2->MaxQPI > pExtCO2->MinQPI && pExtCO2->MinQPI >=1
        && pExtCO2->MaxQPP <=51 && pExtCO2->MaxQPP > pExtCO2->MinQPP && pExtCO2->MinQPP >=1
        && pExtCO2->MaxQPB <=51 && pExtCO2->MaxQPB > pExtCO2->MinQPB && pExtCO2->MinQPB >=1 )
    {
        quantMaxI = pExtCO2->MaxQPI + quantOffset;
        quantMinI = pExtCO2->MinQPI;
        quantMaxP = pExtCO2->MaxQPP + quantOffset;
        quantMinP = pExtCO2->MinQPP;
        quantMaxB = pExtCO2->MaxQPB + quantOffset;
        quantMinB = pExtCO2->MinQPB;
    }
    else
    {
        quantMaxI = quantMaxP = quantMaxB = 51 + quantOffset;
        quantMinI = quantMinP = quantMinB = 1;
    }

    mfxExtCodingOption3 * pExtCO3 = (mfxExtCodingOption3*)Hevc_GetExtBuffer(par->ExtParam, par->NumExtParam, MFX_EXTBUFF_CODING_OPTION3);
    if (pExtCO3)
    {
        WinBRCMaxAvgKbps = pExtCO3->WinBRCMaxAvgKbps*par->mfx.BRCParamMultiplier;
        WinBRCSize = pExtCO3->WinBRCSize;
    }
    return MFX_ERR_NONE;
}

mfxStatus   cBRCParams::GetBRCResetType(mfxVideoParam* par, bool bNewSequence, bool &bBRCReset, bool &bSlidingWindowReset)
{
    bBRCReset = false;
    bSlidingWindowReset = false;

    if (bNewSequence)
        return MFX_ERR_NONE;

    cBRCParams new_par;
    mfxStatus sts = new_par.Init(par);
    MFX_CHECK_STS(sts);

    MFX_CHECK(new_par.rateControlMethod == rateControlMethod, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM) ;
    MFX_CHECK(new_par.HRDConformance == HRDConformance, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM) ;
    MFX_CHECK(new_par.frameRate == frameRate, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
    MFX_CHECK(new_par.width == width, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
    MFX_CHECK(new_par.height == height, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
    MFX_CHECK(new_par.chromaFormat == chromaFormat, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
    MFX_CHECK(new_par.bitDepthLuma == bitDepthLuma, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);

    if (HRDConformance == MFX_BRC_HRD_STRONG)
    {
        MFX_CHECK(new_par.bufferSizeInBytes   == bufferSizeInBytes, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
        MFX_CHECK(new_par.initialDelayInBytes == initialDelayInBytes, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
        MFX_CHECK(new_par.targetbps == targetbps, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
        MFX_CHECK(new_par.maxbps == maxbps, MFX_ERR_INCOMPATIBLE_VIDEO_PARAM);
    }
    else if (new_par.targetbps != targetbps || new_par.maxbps != maxbps)
    {
        bBRCReset = true;
    }

    if (new_par.WinBRCMaxAvgKbps != WinBRCMaxAvgKbps)
    {
        bBRCReset = true;
        bSlidingWindowReset = true;
    }

    if (new_par.maxFrameSizeInBits != maxFrameSizeInBits) bBRCReset = true;
    if (new_par.gopPicSize != gopPicSize) bBRCReset = true;
    if (new_par.gopRefDist != gopRefDist) bBRCReset = true;
    if (new_par.bPyr != bPyr) bBRCReset = true;
    if (new_par.quantMaxI != quantMaxI) bBRCReset = true;
    if (new_par.quantMinI != quantMinI) bBRCReset = true;
    if (new_par.quantMaxP != quantMaxP) bBRCReset = true;
    if (new_par.quantMinP != quantMinP) bBRCReset = true;
    if (new_par.quantMaxB != quantMaxB) bBRCReset = true;
    if (new_par.quantMinB != quantMinB) bBRCReset = true;

    return MFX_ERR_NONE;
}


enum
{
    MFX_BRC_RECODE_NONE           = 0,
    MFX_BRC_RECODE_QP             = 1,
    MFX_BRC_RECODE_PANIC          = 2,
};

   mfxF64 const QSTEP[88] = {
         0.630,  0.707,  0.794,  0.891,  1.000,   1.122,   1.260,   1.414,   1.587,   1.782,   2.000,   2.245,   2.520,
         2.828,  3.175,  3.564,  4.000,  4.490,   5.040,   5.657,   6.350,   7.127,   8.000,   8.980,  10.079,  11.314,
        12.699, 14.254, 16.000, 17.959, 20.159,  22.627,  25.398,  28.509,  32.000,  35.919,  40.317,  45.255,  50.797,
        57.018, 64.000, 71.838, 80.635, 90.510, 101.594, 114.035, 128.000, 143.675, 161.270, 181.019, 203.187, 228.070,
        256.000, 287.350, 322.540, 362.039, 406.375, 456.140, 512.000, 574.701, 645.080, 724.077, 812.749, 912.280,
        1024.000, 1149.401, 1290.159, 1448.155, 1625.499, 1824.561, 2048.000, 2298.802, 2580.318, 2896.309, 3250.997, 3649.121,
        4096.000, 4597.605, 5160.637, 5792.619, 6501.995, 7298.242, 8192.000, 9195.209, 10321.273, 11585.238, 13003.989, 14596.485
    };


mfxI32 QStep2QpFloor(mfxF64 qstep, mfxI32 qpoffset = 0) // QSTEP[qp] <= qstep, return 0<=qp<=51+mQuantOffset
{
    mfxU8 qp = mfxU8(std::upper_bound(QSTEP, QSTEP + 51 + qpoffset, qstep) - QSTEP);
    return qp > 0 ? qp - 1 : 0;
}

mfxI32 Qstep2QP(mfxF64 qstep, mfxI32 qpoffset = 0) // return 0<=qp<=51+mQuantOffset
{
    mfxI32 qp = QStep2QpFloor(qstep, qpoffset);

    // prevent going QSTEP index out of bounds
    if (qp >= (mfxI32)(sizeof(QSTEP)/sizeof(mfxF64)) - 1)
        return 0;
    return (qp == 51 + qpoffset || qstep < (QSTEP[qp] + QSTEP[qp + 1]) / 2) ? qp : qp + 1;
}
mfxF64 QP2Qstep(mfxI32 qp, mfxI32 qpoffset = 0)
{
    return QSTEP[std::min(51 + qpoffset, qp)];
}


mfxF64  cHRD::GetBufferDiviation(mfxU32 targetBitrate)
{
    mfxI64 targetFullness    = std::min(m_delayInBits, m_buffSizeInBits / 2);
    mfxI64 minTargetFullness = std::min<mfxU32>(m_buffSizeInBits / 2, targetBitrate * 2); // half bufsize or 2 sec
    targetFullness           = std::max(targetFullness, minTargetFullness);

    return targetFullness - m_bufFullness;
}

mfxU16 cHRD::UpdateAndCheckHRD(mfxI32 frameBits, mfxI32 recode, mfxI32 minQuant, mfxI32 maxQuant)
{
    mfxU16 brcStatus = MFX_BRC_OK ;

    if (recode  == 0)
    {
        m_prevBufFullness = m_bufFullness;
        m_underflowQuant = minQuant - 1;
        m_overflowQuant  = maxQuant + 1;
    }
    else
    { // frame is being recoded - restore buffer state
        m_bufFullness = m_prevBufFullness;
        m_frameNum--;
    }

    m_maxFrameSize = (mfxI32)(m_bufFullness - 1);
    m_minFrameSize = (!m_bCBR)? 0 : (mfxI32)(m_bufFullness + 1 + 1 + m_inputBitsPerFrame - m_buffSizeInBits);
    if (m_minFrameSize < 0)
        m_minFrameSize = 0;

   mfxF64  bufFullness = m_bufFullness - frameBits;

    if (bufFullness < 2)
    {
        bufFullness = m_inputBitsPerFrame;
        brcStatus = MFX_BRC_BIG_FRAME;
        if (bufFullness > m_buffSizeInBits)
            bufFullness = m_buffSizeInBits;
    }
    else
    {
        bufFullness += m_inputBitsPerFrame;
        if (bufFullness > m_buffSizeInBits - 1)
        {
            bufFullness = m_buffSizeInBits - 1;
            if (m_bCBR)
                brcStatus = MFX_BRC_SMALL_FRAME;
        }
    }
    m_frameNum++;
    if ( MFX_BRC_RECODE_PANIC == recode) // no use in changing QP
    {
        if (brcStatus == MFX_BRC_SMALL_FRAME)
            brcStatus =  MFX_BRC_PANIC_SMALL_FRAME ;
        if (brcStatus == MFX_BRC_BIG_FRAME)
            brcStatus =  MFX_BRC_PANIC_BIG_FRAME ;    }

    m_bufFullness = bufFullness;
    return brcStatus;
}

mfxStatus cHRD::UpdateMinMaxQPForRec( mfxU32 brcSts, mfxI32 qp)
{
    MFX_CHECK(brcSts == MFX_BRC_BIG_FRAME || brcSts == MFX_BRC_SMALL_FRAME, MFX_ERR_UNDEFINED_BEHAVIOR);
    if (brcSts == MFX_BRC_BIG_FRAME)
        m_underflowQuant = qp;
    else
        m_overflowQuant = qp;
    return MFX_ERR_NONE;
}
mfxI32 cHRD::GetTargetSize(mfxU32 brcSts)
{
     if (brcSts != MFX_BRC_BIG_FRAME && brcSts != MFX_BRC_SMALL_FRAME) return 0;
     return (brcSts == MFX_BRC_BIG_FRAME) ? m_maxFrameSize * 3 / 4 : m_minFrameSize * 5 / 4;
}

mfxI32 GetNewQP(mfxF64 totalFrameBits, mfxF64 targetFrameSizeInBits, mfxI32 minQP , mfxI32 maxQP, mfxI32 qp , mfxI32 qp_offset, mfxF64 f_pow, bool bStrict = false, bool bLim = true)
{
    mfxF64 qstep = 0, qstep_new = 0;
    mfxI32 qp_new = qp;

    qstep = QP2Qstep(qp, qp_offset);
    qstep_new = qstep * pow(totalFrameBits / targetFrameSizeInBits, f_pow);
    qp_new = Qstep2QP(qstep_new, qp_offset);

    if (totalFrameBits < targetFrameSizeInBits) // overflow
    {
        if (qp <= minQP)
        {
            return qp; // QP change is impossible
        }
        if (bLim)
            qp_new  = std::max(qp_new , (minQP + qp + 1) >> 1);
        if (bStrict)
            qp_new  = std::min(qp_new, qp - 1);
    }
    else // underflow
    {
        if (qp >= maxQP)
        {
            return qp; // QP change is impossible
        }
        if (bLim)
            qp_new  = std::min(qp_new , (maxQP + qp + 1) >> 1);
        if (bStrict)
            qp_new  = std::max(qp_new, qp + 1);
    }
    return mfx::clamp(qp_new, minQP, maxQP);
}


void cHRD::Init(mfxU32 buffSizeInBytes, mfxU32 delayInBytes, mfxF64 inputBitsPerFrame, bool bCBR)
{
    m_bufFullness = m_prevBufFullness= delayInBytes << 3;
    m_delayInBits = delayInBytes << 3;
    m_buffSizeInBits = buffSizeInBytes << 3;
    m_inputBitsPerFrame =inputBitsPerFrame;
    m_bCBR = bCBR;

    m_underflowQuant = 0;
    m_overflowQuant = 999;
    m_frameNum = 0;
    m_minFrameSize = 0;
    m_maxFrameSize = 0;

}

void UpdateQPParams(mfxI32 qp, mfxU32 type , BRC_Ctx  &ctx, mfxU32 /* rec_num */, mfxI32 minQuant, mfxI32 maxQuant, mfxU32 level)
{
    ctx.Quant = qp;
    if (type == MFX_FRAMETYPE_I)
    {
        ctx.QuantI = qp;
        ctx.QuantP = qp + 1;
        ctx.QuantB = qp + 2;
    }
    else if (type == MFX_FRAMETYPE_P)
    {
        qp -= level;
        ctx.QuantI =  qp - 1;
        ctx.QuantP = qp;
        ctx.QuantB = qp + 1;
    }
    else if (type == MFX_FRAMETYPE_B)
    {
        level = level > 0 ? level - 1: 0;
        qp -= level;
        ctx.QuantI = qp - 2;
        ctx.QuantP = qp - 1;
        ctx.QuantB = qp;
    }
    ctx.QuantI = mfx::clamp(ctx.QuantI, minQuant, maxQuant);
    ctx.QuantP = mfx::clamp(ctx.QuantP, minQuant, maxQuant);
    ctx.QuantB = mfx::clamp(ctx.QuantB, minQuant, maxQuant);
    //printf("ctx.QuantI %d, ctx.QuantP %d, ctx.QuantB  %d, level %d\n", ctx.QuantI, ctx.QuantP, ctx.QuantB, level);
}

mfxI32 GetRawFrameSize(mfxU32 lumaSize, mfxU16 chromaFormat, mfxU16 bitDepthLuma)
{
    mfxI32 frameSize = lumaSize;

  if (chromaFormat == MFX_CHROMAFORMAT_YUV420)
    frameSize += lumaSize / 2;
  else if (chromaFormat == MFX_CHROMAFORMAT_YUV422)
   frameSize += lumaSize;
  else if (chromaFormat == MFX_CHROMAFORMAT_YUV444)
    frameSize += lumaSize * 2;

  frameSize = frameSize * bitDepthLuma / 8;
  return frameSize*8; //frame size in bits
}

mfxStatus ExtBRC::Init (mfxVideoParam* par)
{
    mfxStatus sts = MFX_ERR_NONE;

    MFX_CHECK(!m_bInit, MFX_ERR_UNDEFINED_BEHAVIOR);
    sts = m_par.Init(par);
    MFX_CHECK_STS(sts);

    if (m_par.HRDConformance != MFX_BRC_NO_HRD)
    {
        m_hrd.Init(m_par.bufferSizeInBytes, m_par.initialDelayInBytes, m_par.maxInputBitsPerFrame, m_par.rateControlMethod == MFX_RATECONTROL_CBR);
    }
    memset(&m_ctx, 0, sizeof(m_ctx));

    m_ctx.fAbLong  = m_par.inputBitsPerFrame;
    m_ctx.fAbShort = m_par.inputBitsPerFrame;
    m_ctx.encOrder = mfxU32(-1);

    mfxI32 rawSize = GetRawFrameSize(m_par.width * m_par.height ,m_par.chromaFormat, m_par.bitDepthLuma);
    mfxI32 qp = GetNewQP(rawSize, m_par.inputBitsPerFrame, m_par.quantMinI, m_par.quantMaxI, 1 , m_par.quantOffset, 0.5, false, false);

    UpdateQPParams(qp,MFX_FRAMETYPE_I , m_ctx, 0, m_par.quantMinI, m_par.quantMaxI, 0);

    m_ctx.dQuantAb = qp > 0 ? 1./qp : 1.0; //kw

    if (m_par.WinBRCSize)
    {
        m_avg.reset(new AVGBitrate(m_par.WinBRCSize, (mfxU32)(m_par.WinBRCMaxAvgKbps*1000.0/m_par.frameRate), (mfxU32)m_par.inputBitsPerFrame) );
        MFX_CHECK_NULL_PTR1(m_avg.get());
    }

    m_bInit = true;
    return sts;
}

mfxU16 GetFrameType(mfxU16 m_frameType, mfxU16 level, mfxU16 gopRegDist)
{
    if (m_frameType & MFX_FRAMETYPE_IDR)
        return MFX_FRAMETYPE_I;
    else if (m_frameType & MFX_FRAMETYPE_I)
        return MFX_FRAMETYPE_I;
    else if (m_frameType & MFX_FRAMETYPE_P)
        return MFX_FRAMETYPE_P;
    else if ((m_frameType & MFX_FRAMETYPE_REF) && (level == 0 || gopRegDist == 1))
        return MFX_FRAMETYPE_P; //low delay B
    else
        return MFX_FRAMETYPE_B;
}


bool  isFrameBeforeIntra (mfxU32 order, mfxU32 intraOrder, mfxU32 gopPicSize, mfxU32 gopRefDist)
{
    mfxI32 distance0 = gopPicSize*3/4;
    mfxI32 distance1 = gopPicSize - gopRefDist*3;
    return mfxI32(order - intraOrder) > std::max(distance0, distance1);
}

mfxStatus SetRecodeParams(mfxU16 brcStatus, mfxI32 qp, mfxI32 qp_new, mfxI32 minQP, mfxI32 maxQP, BRC_Ctx &ctx, mfxBRCFrameStatus* status)
{
    ctx.bToRecode = 1;

    if (brcStatus == MFX_BRC_BIG_FRAME || brcStatus == MFX_BRC_PANIC_BIG_FRAME )
    {
         MFX_CHECK(qp_new >= qp, MFX_ERR_UNDEFINED_BEHAVIOR);
         ctx.Quant = qp_new;
         ctx.QuantMax = maxQP;
         if (brcStatus == MFX_BRC_BIG_FRAME && qp_new > qp)
         {
            ctx.QuantMin = std::max(qp + 1, minQP); //limit QP range for recoding
            status->BRCStatus = MFX_BRC_BIG_FRAME;

         }
         else
         {
             ctx.QuantMin = minQP;
             ctx.bPanic = 1;
             status->BRCStatus = MFX_BRC_PANIC_BIG_FRAME;
         }
    }
    else if (brcStatus == MFX_BRC_SMALL_FRAME || brcStatus == MFX_BRC_PANIC_SMALL_FRAME)
    {
         MFX_CHECK(qp_new <= qp, MFX_ERR_UNDEFINED_BEHAVIOR);

         ctx.Quant = qp_new;
         ctx.QuantMin = minQP; //limit QP range for recoding

         if (brcStatus == MFX_BRC_SMALL_FRAME && qp_new < qp)
         {
            ctx.QuantMax = std::min(qp - 1, maxQP);
            status->BRCStatus = MFX_BRC_SMALL_FRAME;
         }
         else
         {
            ctx.QuantMax = maxQP;
            status->BRCStatus = MFX_BRC_PANIC_SMALL_FRAME;
            ctx.bPanic = 1;
         }
    }
    //printf("recode %d , qp %d new %d, status %d\n", ctx.encOrder, qp, qp_new, status->BRCStatus);
    return MFX_ERR_NONE;
}
mfxI32 GetNewQPTotal(mfxF64 bo, mfxF64 dQP, mfxI32 minQP , mfxI32 maxQP, mfxI32 qp, bool bPyr, bool bSC)
{
    mfxU8 mode = (!bPyr) ;

    bo  = mfx::clamp(bo, -1.0, 1.0);
    dQP = mfx::clamp(dQP, 1./maxQP, 1./minQP);
    dQP = dQP + (1./maxQP - dQP) * bo;
    dQP = mfx::clamp(dQP, 1./maxQP, 1./minQP);
    mfxI32 quant_new = (mfxI32) (1. / dQP + 0.5);

    //printf("   GetNewQPTotal: bo %f, quant %d, quant_new %d, mode %d\n", bo, qp, quant_new, mode);
    if (!bSC)
    {
        if (mode == 0) // low: qp_diff [-2; 2]
        {
            if (quant_new >= qp + 5)
                quant_new = qp + 2;
            else if (quant_new > qp + 3)
                quant_new = qp + 1;
            else if (quant_new <= qp - 5)
                quant_new = qp - 2;
            else if (quant_new < qp - 2)
                quant_new = qp - 1;
        }
        else // (mode == 1) midle: qp_diff [-3; 3]
        {
            if (quant_new >= qp + 5)
                quant_new = qp + 3;
            else if (quant_new > qp + 3)
                quant_new = qp + 2;
            else if (quant_new <= qp - 5)
                quant_new = qp - 3;
            else if (quant_new < qp - 2)
                quant_new = qp - 2;
        }

    }
    else
    {
        quant_new = mfx::clamp(quant_new, qp - 5, qp + 5);
    }
    return mfx::clamp(quant_new, minQP, maxQP);
}
// Reduce AB period before intra and increase it after intra (to avoid intra frame affect on the bottom of hrd)
mfxF64 GetAbPeriodCoeff (mfxU32 numInGop, mfxU32 gopPicSize)
{
    const mfxU32 maxForCorrection = 30;
    const mfxF64 maxValue = 1.5;
    const mfxF64 minValue = 1.0;

    mfxU32 numForCorrection = std::min(gopPicSize /2, maxForCorrection);
    mfxF64 k[maxForCorrection] = {};

    if (numInGop >= gopPicSize || gopPicSize < 2)
        return 1.0;

    for (mfxU32 i = 0; i < numForCorrection; i ++)
    {
        k[i] = maxValue - (maxValue - minValue)*i/numForCorrection;
    }
    if (numInGop < gopPicSize/2)
    {
        return k [numInGop < numForCorrection ? numInGop : numForCorrection - 1];
    }
    else
    {
        mfxU32 n = gopPicSize - 1 - numInGop;
        return 1.0/ k[n < numForCorrection ? n : numForCorrection - 1];
    }

}

mfxI32 ExtBRC::GetCurQP (mfxU32 type, mfxI32 layer)
{
    mfxI32 qp = 0;
    if (type == MFX_FRAMETYPE_I)
    {
        qp = m_ctx.QuantI;
        qp = mfx::clamp(qp, m_par.quantMinI, m_par.quantMaxI);
    }
    else if (type == MFX_FRAMETYPE_P)
    {
        qp = m_ctx.QuantP + layer;
        qp = mfx::clamp(qp, m_par.quantMinP, m_par.quantMaxP);
    }
    else
    {
        qp = m_ctx.QuantB + (layer > 0 ? layer - 1 : 0);
        qp = mfx::clamp(qp, m_par.quantMinB, m_par.quantMaxB);
    }
    //printf("GetCurQP I %d P %d B %d, min %d max %d type %d \n", m_ctx.QuantI, m_ctx.QuantP, m_ctx.QuantB, m_par.quantMinI, m_par.quantMaxI, type);

    return qp;
}

mfxStatus ExtBRC::Update(mfxBRCFrameParam* frame_par, mfxBRCFrameCtrl* frame_ctrl, mfxBRCFrameStatus* status)
{
    mfxStatus sts       = MFX_ERR_NONE;

    MFX_CHECK_NULL_PTR3(frame_par, frame_ctrl, status);
    MFX_CHECK(m_bInit, MFX_ERR_NOT_INITIALIZED);

    mfxU16 &brcSts       = status->BRCStatus;
    status->MinFrameSize  = 0;

    //printf("ExtBRC::Update:  m_ctx.encOrder %d , frame_par->EncodedOrder %d, frame_par->NumRecode %d, frame_par->CodedFrameSize %d, qp %d\n", m_ctx.encOrder , frame_par->EncodedOrder, frame_par->NumRecode, frame_par->CodedFrameSize, frame_ctrl->QpY);

    mfxI32 bitsEncoded  = frame_par->CodedFrameSize*8;
    mfxU32 picType      = GetFrameType(frame_par->FrameType, frame_par->PyramidLayer, m_par.gopRefDist);
    mfxI32 qpY          = frame_ctrl->QpY + m_par.quantOffset;
    mfxI32 layer        = frame_par->PyramidLayer;
    mfxF64 qstep        = QP2Qstep(qpY, m_par.quantOffset);

    mfxF64 fAbLong  = m_ctx.fAbLong   + (bitsEncoded - m_ctx.fAbLong)  / m_par.fAbPeriodLong;
    mfxF64 fAbShort = m_ctx.fAbShort  + (bitsEncoded - m_ctx.fAbShort) / m_par.fAbPeriodShort;
    mfxF64 eRate    = bitsEncoded * sqrt(qstep);
    mfxF64 e2pe     =  0;
    bool bMaxFrameSizeMode = m_par.maxFrameSizeInBits != 0 &&
        m_par.rateControlMethod == MFX_RATECONTROL_VBR &&
        m_par.maxFrameSizeInBits < m_par.inputBitsPerFrame * 2 &&
        m_ctx.totalDiviation < (-1)*m_par.inputBitsPerFrame*m_par.frameRate;

    if (picType == MFX_FRAMETYPE_I)
        e2pe = (m_ctx.eRateSH == 0) ? (BRC_SCENE_CHANGE_RATIO2 + 1) : eRate / m_ctx.eRateSH;
    else
        e2pe = (m_ctx.eRate == 0) ? (BRC_SCENE_CHANGE_RATIO2 + 1) : eRate / m_ctx.eRate;

    mfxU32 frameSizeLim    = 0xfffffff ; // sliding window limitation or external frame size limitation

    bool  bSHStart = false;
    bool  bNeedUpdateQP = false;

    brcSts = MFX_BRC_OK;

    if (m_par.bRec && m_ctx.bToRecode &&  (m_ctx.encOrder != frame_par->EncodedOrder || frame_par->NumRecode == 0))
    {
        //printf("++++++++++++++++++++++++++++++++++\n");
        // Frame must be recoded, but encoder calls BR for another frame
        return MFX_ERR_UNDEFINED_BEHAVIOR;
    }
    if (frame_par->NumRecode == 0 || m_ctx.encOrder != frame_par->EncodedOrder)
    {
        // Set context for new frame
        if (picType == MFX_FRAMETYPE_I)
            m_ctx.LastIEncOrder = frame_par->EncodedOrder;
        m_ctx.encOrder = frame_par->EncodedOrder;
        m_ctx.poc = frame_par->DisplayOrder;
        m_ctx.bToRecode = 0;
        m_ctx.bPanic = 0;

        if (picType == MFX_FRAMETYPE_I)
        {
            m_ctx.QuantMin = m_par.quantMinI;
            m_ctx.QuantMax = m_par.quantMaxI;
        }
        else if (picType == MFX_FRAMETYPE_P)
        {
            m_ctx.QuantMin = m_par.quantMinP;
            m_ctx.QuantMax = m_par.quantMaxP;
        }
        else
        {
            m_ctx.QuantMin = m_par.quantMinB;
            m_ctx.QuantMax = m_par.quantMaxB;
        }
        m_ctx.Quant = qpY;


        if (m_ctx.SceneChange && ( m_ctx.poc > m_ctx.SChPoc + 1 || m_ctx.poc == 0))
            m_ctx.SceneChange &= ~16;

        bNeedUpdateQP = true;

        //printf("m_ctx.SceneChange %d, m_ctx.poc %d, m_ctx.SChPoc %d, m_ctx.poc %d \n", m_ctx.SceneChange, m_ctx.poc, m_ctx.SChPoc, m_ctx.poc);
    }
    if (e2pe > BRC_SCENE_CHANGE_RATIO2 )
    {
      // scene change, resetting BRC statistics
        fAbLong  = m_ctx.fAbLong  = m_par.inputBitsPerFrame;
        fAbShort = m_ctx.fAbShort = m_par.inputBitsPerFrame;
        m_ctx.SceneChange |= 1;
        if (picType != MFX_FRAMETYPE_B)
        {
            bSHStart = true;
            m_ctx.SceneChange |= 16;
            m_ctx.eRateSH = eRate;
            //if ((frame_par->DisplayOrder - m_ctx.SChPoc) >= std::min<mfxU32>(m_par.frameRate, m_par.gopRefDist))
            {
                m_ctx.dQuantAb  = 1./m_ctx.Quant;
            }
            m_ctx.SChPoc = frame_par->DisplayOrder;
            //printf("!!!!!!!!!!!!!!!!!!!!! %d m_ctx.SceneChange %d, order %d\n", frame_par->EncodedOrder, m_ctx.SceneChange, frame_par->DisplayOrder);
        }

    }
    if (m_par.HRDConformance != MFX_BRC_NO_HRD)
    {
        //check hrd
        brcSts = m_hrd.UpdateAndCheckHRD(bitsEncoded,frame_par->NumRecode, m_ctx.QuantMin,m_ctx.QuantMax);
        //printf("--UpdateAndCheckHRD (%d) brcSts %d, panic %d\n", frame_par->EncodedOrder,brcSts, m_ctx.bPanic);
        MFX_CHECK(brcSts ==  MFX_BRC_OK || (!m_ctx.bPanic), MFX_ERR_NOT_ENOUGH_BUFFER);
        if (brcSts == MFX_BRC_BIG_FRAME || brcSts == MFX_BRC_SMALL_FRAME)
            m_hrd.UpdateMinMaxQPForRec(brcSts, qpY);
        else
            bNeedUpdateQP = true;
        status->MinFrameSize = m_hrd.GetMinFrameSize();
        //printf("%d: poc %d, size %d QP %d (%d %d), HRD sts %d, maxFrameSize %d, type %d \n",frame_par->EncodedOrder, frame_par->DisplayOrder, bitsEncoded, m_ctx.Quant, m_ctx.QuantMin, m_ctx.QuantMax, brcSts,  m_hrd.GetMaxFrameSize(), frame_par->FrameType);
    }
    if (m_avg.get())
    {
       frameSizeLim = std::min(frameSizeLim, m_avg->GetMaxFrameSize(m_ctx.bPanic, bSHStart || picType == MFX_FRAMETYPE_I, frame_par->NumRecode));
    }
    if (m_par.maxFrameSizeInBits)
    {
        frameSizeLim = std::min(frameSizeLim, m_par.maxFrameSizeInBits);
    }
    //printf("frameSizeLim %d (%d)\n", frameSizeLim, bitsEncoded);

    if (frame_par->NumRecode < 2)
    // Check other condions for recoding (update qp is it is needed)
    {
        mfxF64 targetFrameSize = std::max<mfxF64>(m_par.inputBitsPerFrame, fAbLong);
        mfxF64 maxFrameSize = (m_ctx.encOrder == 0 ? 6.0 : (bSHStart || picType == MFX_FRAMETYPE_I) ? 8.0 : 4.0) * targetFrameSize*(m_par.bPyr ? 1.5 : 1.0) ;
        mfxI32 quantMax = m_ctx.QuantMax;
        mfxI32 quantMin = m_ctx.QuantMin;
        mfxI32 quant = qpY;

        maxFrameSize = std::min<mfxF64>(maxFrameSize, frameSizeLim);

        if (m_par.HRDConformance != MFX_BRC_NO_HRD)
        {
            if (bSHStart || picType == MFX_FRAMETYPE_I)
                maxFrameSize = std::min(maxFrameSize, 3.5/9. * m_hrd.GetMaxFrameSize() + 5.5/9. * targetFrameSize);
            else
                maxFrameSize = std::min(maxFrameSize, 2.5/9. * m_hrd.GetMaxFrameSize() + 6.5/9. * targetFrameSize);

            quantMax = std::min(m_hrd.GetMaxQuant(), quantMax);
            quantMin = std::max(m_hrd.GetMinQuant(), quantMin);
        }
        maxFrameSize = std::max(maxFrameSize, targetFrameSize);

        if (bitsEncoded >  maxFrameSize && quant < quantMax)
        {

            mfxI32 quant_new = GetNewQP(bitsEncoded, (mfxU32)maxFrameSize, quantMin , quantMax, quant ,m_par.quantOffset, 1);
            if (quant_new > quant )
            {
                bNeedUpdateQP = false;
                //printf("    recode 1-0: %d:  k %5f bitsEncoded %d maxFrameSize %d, targetSize %d, fAbLong %f, inputBitsPerFrame %f, qp %d new %d\n",frame_par->EncodedOrder, bitsEncoded/maxFrameSize, (int)bitsEncoded, (int)maxFrameSize,(int)targetFrameSize, fAbLong, m_par.inputBitsPerFrame, quant, quant_new);
                if (quant_new > GetCurQP (picType, layer))
                {
                    UpdateQPParams(bMaxFrameSizeMode? quant_new - 1 : quant_new ,picType, m_ctx, 0, quantMin , quantMax, layer);
                    fAbLong  =  m_ctx.fAbLong  = m_par.inputBitsPerFrame;
                    fAbShort =  m_ctx.fAbShort = m_par.inputBitsPerFrame;
                    m_ctx.dQuantAb = 1./quant_new;
                }

                if (m_par.bRec)
                {
                    SetRecodeParams(MFX_BRC_BIG_FRAME,quant,quant_new, quantMin, quantMax, m_ctx, status);
                    return sts;
                }
            } //(quant_new > quant)
        } //bitsEncoded >  maxFrameSize

        if (bitsEncoded >  maxFrameSize && quant == quantMax &&
            picType != MFX_FRAMETYPE_I && m_par.bPanic &&
            (!m_ctx.bPanic) && isFrameBeforeIntra(m_ctx.encOrder, m_ctx.LastIEncOrder, m_par.gopPicSize, m_par.gopRefDist))
        {
            //skip frames before intra
            SetRecodeParams(MFX_BRC_PANIC_BIG_FRAME,quant,quant, quantMin ,quantMax, m_ctx, status);
            return sts;
        }
        if (m_par.HRDConformance != MFX_BRC_NO_HRD && frame_par->NumRecode == 0 && (quant < quantMax))
        {
            mfxF64 FAMax = 1./9. * m_hrd.GetMaxFrameSize() + 8./9. * fAbLong;

            if (fAbShort > FAMax)
            {
                mfxI32 quant_new = GetNewQP(fAbShort, FAMax, quantMin , quantMax, quant ,m_par.quantOffset, 0.5);
                //printf("    recode 2-0: %d:  FAMax %f, fAbShort %f, quant_new %d\n",frame_par->EncodedOrder, FAMax, fAbShort, quant_new);

                if (quant_new > quant)
                {
                   bNeedUpdateQP = false;
                   if (quant_new > GetCurQP (picType, layer))
                   {
                        UpdateQPParams(quant_new ,picType, m_ctx, 0, quantMin , quantMax, layer);
                        fAbLong  = m_ctx.fAbLong  = m_par.inputBitsPerFrame;
                        fAbShort = m_ctx.fAbShort = m_par.inputBitsPerFrame;
                        m_ctx.dQuantAb = 1./quant_new;
                    }
                    if (m_par.bRec)
                    {
                        SetRecodeParams(MFX_BRC_BIG_FRAME,quant,quant_new, quantMin, quantMax, m_ctx, status);
                        return sts;
                    }
                }//quant_new > quant
            }
        }//m_par.HRDConformance
    }
    if (((m_par.HRDConformance != MFX_BRC_NO_HRD && brcSts != MFX_BRC_OK) || (bitsEncoded > (mfxI32)frameSizeLim)) && m_par.bRec)
    {
        mfxI32 quant = m_ctx.Quant;
        mfxI32 quant_new = quant;
        if (bitsEncoded > (mfxI32)frameSizeLim)
        {
            brcSts = MFX_BRC_BIG_FRAME;
            quant_new = GetNewQP(bitsEncoded, frameSizeLim, m_ctx.QuantMin , m_ctx.QuantMax,quant,m_par.quantOffset, 1, true);
        }
        else if (brcSts == MFX_BRC_BIG_FRAME || brcSts == MFX_BRC_SMALL_FRAME)
        {
            quant_new = GetNewQP(bitsEncoded, m_hrd.GetTargetSize(brcSts), m_ctx.QuantMin , m_ctx.QuantMax,quant,m_par.quantOffset, 1, true);
        }
        if (quant_new != quant)
        {
            if (brcSts == MFX_BRC_SMALL_FRAME)
            {
               quant_new = std::max(quant_new, quant-2);
               brcSts = MFX_BRC_PANIC_SMALL_FRAME;
            }
            // Idea is to check a sign mismatch, 'true' if both are negative or positive
            if ((quant_new - qpY) * (quant_new - GetCurQP (picType, layer)) > 0)
            {
                UpdateQPParams(quant_new ,picType, m_ctx, 0, m_ctx.QuantMin , m_ctx.QuantMax, layer);
            }
            bNeedUpdateQP = false;
        }
        SetRecodeParams(brcSts,quant,quant_new, m_ctx.QuantMin , m_ctx.QuantMax, m_ctx, status);
    }
    else
    {
        // no recoding are needed. Save context params

        mfxF64 k = 1./m_ctx.Quant;
        mfxF64 dqAbPeriod = m_par.dqAbPeriod;
        if (m_ctx.bToRecode)
            dqAbPeriod = (k < m_ctx.dQuantAb)? 16:25;

        if (bNeedUpdateQP)
        {
            m_ctx.dQuantAb += (k - m_ctx.dQuantAb)/dqAbPeriod;
            m_ctx.dQuantAb = mfx::clamp(m_ctx.dQuantAb, 1./m_ctx.QuantMax , 1./m_ctx.QuantMin);

            m_ctx.fAbLong  = fAbLong;
            m_ctx.fAbShort = fAbShort;
        }

        bool oldScene = false;
        if ((m_ctx.SceneChange & 16) && (m_ctx.poc < m_ctx.SChPoc) && (e2pe < .01) && (mfxF64)bitsEncoded < 1.5*fAbLong)
            oldScene = true;
        //printf("-- m_ctx.eRate %f,  eRate %f, e2pe %f\n", m_ctx.eRate,  eRate, e2pe );

        if (picType != MFX_FRAMETYPE_B)
        {
            m_ctx.LastNonBFrameSize = bitsEncoded;
            if (picType == MFX_FRAMETYPE_I)
                m_ctx.eRateSH = eRate;
            else
                m_ctx.eRate = eRate;

        }

        if (m_avg.get())
        {
            m_avg->UpdateSlidingWindow(bitsEncoded, m_ctx.encOrder, m_ctx.bPanic, bSHStart || picType == MFX_FRAMETYPE_I,frame_par->NumRecode);
        }

        m_ctx.totalDiviation += ((mfxF64)bitsEncoded - m_par.inputBitsPerFrame);

        //printf("-- %d (%d)) Total deviation %f, old scene %d, bNeedUpdateQP %d, m_ctx.Quant %d, type %d\n", frame_par->EncodedOrder, frame_par->DisplayOrder,m_ctx.totalDiviation, oldScene , bNeedUpdateQP, m_ctx.Quant,picType);

        if (!m_ctx.bPanic&& (!oldScene) && bNeedUpdateQP)
        {
            mfxI32 quant_new = m_ctx.Quant;
            //Update QP

            mfxF64 totDiv = m_ctx.totalDiviation;
            mfxF64 dequant_new = m_ctx.dQuantAb*pow(m_par.inputBitsPerFrame/m_ctx.fAbLong, 1.2);
            mfxF64 bAbPreriod = m_par.bAbPeriod;

            if (m_par.HRDConformance != MFX_BRC_NO_HRD && totDiv > 0 )
            {
                if (m_par.rateControlMethod == MFX_RATECONTROL_VBR)
                {
                    totDiv = std::max(totDiv, m_hrd.GetBufferDiviation(m_par.targetbps));
                }
                bAbPreriod = (mfxF64)(m_par.bPyr? 4 : 3)*(mfxF64)m_hrd.GetMaxFrameSize() / m_par.inputBitsPerFrame*GetAbPeriodCoeff(m_ctx.encOrder - m_ctx.LastIEncOrder, m_par.gopPicSize) ;
                bAbPreriod = mfx::clamp(bAbPreriod , m_par.bAbPeriod/10, m_par.bAbPeriod);
            }
            quant_new = GetNewQPTotal(totDiv / bAbPreriod / (mfxF64)m_par.inputBitsPerFrame, dequant_new, m_ctx.QuantMin, m_ctx.QuantMax, m_ctx.Quant, m_par.bPyr && m_par.bRec, bSHStart && m_ctx.bToRecode == 0);
            //printf("    ===%d quant old %d quant_new %d, bitsEncoded %d m_ctx.QuantMin %d m_ctx.QuantMax %d\n", frame_par->EncodedOrder, m_ctx.Quant, quant_new, bitsEncoded, m_ctx.QuantMin, m_ctx.QuantMax);

            if (bMaxFrameSizeMode)
            {
                mfxF64 targetMax = ((mfxF64)m_par.maxFrameSizeInBits*((bSHStart || picType == MFX_FRAMETYPE_I) ? 0.95 : 0.9));
                mfxF64 targetMin = ((mfxF64)m_par.maxFrameSizeInBits*((bSHStart || picType == MFX_FRAMETYPE_I) ? 0.9  : 0.8 /*0.75 : 0.5*/));
                mfxI32 QuantNewMin = GetNewQP(bitsEncoded, targetMax, m_ctx.QuantMin, m_ctx.QuantMax, m_ctx.Quant, m_par.quantOffset, 1,false, false);
                mfxI32 QuantNewMax = GetNewQP(bitsEncoded, targetMin, m_ctx.QuantMin, m_ctx.QuantMax, m_ctx.Quant, m_par.quantOffset, 1,false, false);
                mfxI32 quant_corrected = m_ctx.Quant;

                if (quant_corrected < QuantNewMin - 3)
                    quant_corrected += 2;
                if (quant_corrected < QuantNewMin)
                    quant_corrected ++;
                else if (quant_corrected > QuantNewMax + 3)
                    quant_corrected -= 2;
                else if (quant_corrected > QuantNewMax)
                    quant_corrected--;

                //printf("   QuantNewMin %d, QuantNewMax %d, m_ctx.Quant %d, new %d (%d)\n", QuantNewMin, QuantNewMax, m_ctx.Quant, quant_corrected, quant_new);

                quant_new = mfx::clamp(quant_corrected, m_ctx.QuantMin, m_ctx.QuantMax);
            }
            if ((quant_new - m_ctx.Quant)* (quant_new - GetCurQP (picType, layer)) > 0) // this check is actual for async scheme
            {
                //printf("   Update QP %d: totalDiviation %f, bAbPreriod %f (%f), QP %d (%d %d), qp_new %d (qpY %d), type %d, dequant_new %f (%f) , m_ctx.fAbLong %f, m_par.inputBitsPerFrame %f (%f)\n", frame_par->EncodedOrder, totDiv, bAbPreriod, GetAbPeriodCoeff(m_ctx.encOrder - m_ctx.LastIEncOrder, m_par.gopPicSize), m_ctx.Quant, m_ctx.QuantMin, m_ctx.QuantMax, quant_new, qpY, picType, 1.0/dequant_new, 1.0/m_ctx.dQuantAb, m_ctx.fAbLong, m_par.inputBitsPerFrame, m_par.inputBitsPerFrame/m_ctx.fAbLong);
                UpdateQPParams(quant_new ,picType, m_ctx, 0, m_ctx.QuantMin , m_ctx.QuantMax, layer);
            }
        }
        m_ctx.bToRecode = 0;
    }
    return sts;

}

mfxStatus ExtBRC::GetFrameCtrl (mfxBRCFrameParam* par, mfxBRCFrameCtrl* ctrl)
{
    MFX_CHECK_NULL_PTR2(par, ctrl);
    MFX_CHECK(m_bInit, MFX_ERR_NOT_INITIALIZED);

    mfxI32 qp = 0;
    if (par->EncodedOrder == m_ctx.encOrder)
    {
        qp = m_ctx.Quant;
    }
    else
    {
        mfxU16 type = GetFrameType(par->FrameType,par->PyramidLayer, m_par.gopRefDist);
        qp = GetCurQP (type, par->PyramidLayer);
    }
    ctrl->QpY = qp - m_par.quantOffset;
    //printf("ctrl->QpY %d, qp %d quantOffset %d\n", ctrl->QpY , qp , m_par.quantOffset);
    return MFX_ERR_NONE;
}

mfxStatus ExtBRC::Reset(mfxVideoParam *par )
{
    mfxStatus sts = MFX_ERR_NONE;
    MFX_CHECK_NULL_PTR1(par);
    MFX_CHECK(m_bInit, MFX_ERR_NOT_INITIALIZED);

    mfxExtEncoderResetOption  * pRO = (mfxExtEncoderResetOption *)Hevc_GetExtBuffer(par->ExtParam, par->NumExtParam, MFX_EXTBUFF_ENCODER_RESET_OPTION);
    if (pRO && pRO->StartNewSequence == MFX_CODINGOPTION_ON)
    {
        Close();
        sts = Init(par);
    }
    else
    {
        bool brcReset = false;
        bool slidingWindowReset = false;

        sts = m_par.GetBRCResetType(par, false, brcReset, slidingWindowReset);
        MFX_CHECK_STS(sts);

        if (brcReset)
        {
            sts = m_par.Init(par);
            MFX_CHECK_STS(sts);

            m_ctx.Quant = (mfxI32)(1. / m_ctx.dQuantAb * pow(m_ctx.fAbLong / m_par.inputBitsPerFrame, 0.32) + 0.5);
            m_ctx.Quant = mfx::clamp(m_ctx.Quant, m_par.quantMinI, m_par.quantMaxI);

            UpdateQPParams(m_ctx.Quant, MFX_FRAMETYPE_I, m_ctx, 0, m_par.quantMinI, m_par.quantMaxI, 0);

            m_ctx.dQuantAb = 1. / m_ctx.Quant;
            m_ctx.fAbLong = m_par.inputBitsPerFrame;
            m_ctx.fAbShort = m_par.inputBitsPerFrame;

            if (slidingWindowReset)
            {
                m_avg.reset(new AVGBitrate(m_par.WinBRCSize, (mfxU32)(m_par.WinBRCMaxAvgKbps*1000.0 / m_par.frameRate), (mfxU32)m_par.inputBitsPerFrame));
                MFX_CHECK_NULL_PTR1(m_avg.get());
            }
        }
    }
    return sts;
}

#endif