/*****************************************************************************

* Copyright (C) 2013-2020 MulticoreWare, Inc

*

* Authors: Steve Borho <steve@borho.org>

*          Min Chen <chenm003@163.com>

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 2 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.

*

* This program is also available under a commercial proprietary license.

* For more information, contact us at license @ x265.com.

*****************************************************************************/

#ifndef X265_RDCOST_H

#define X265_RDCOST_H

#include "common.h"

#include "slice.h"

namespace X265_NS {

// private namespace

class RDCost

{

public:

    /* all weights and factors stored as FIX8 */

    uint64_t  m_lambda2;

    uint64_t  m_lambda;

    uint32_t  m_chromaDistWeight[2];

    uint32_t  m_psyRdBase;

    uint32_t  m_psyRd;

    uint32_t  m_ssimRd;

    int       m_qp; /* QP used to configure lambda, may be higher than QP_MAX_SPEC but <= QP_MAX_MAX */

    void setPsyRdScale(double scale)                { m_psyRdBase = (uint32_t)floor(65536.0 * scale * 0.33); }

    void setSsimRd(int ssimRd) { m_ssimRd = ssimRd; };

    void setQP(const Slice& slice, int qp)

    {

        x265_emms(); /* TODO: if the lambda tables were ints, this would not be necessary */

        m_qp = qp;

        setLambda(x265_lambda2_tab[qp], x265_lambda_tab[qp]);

        /* Scale PSY RD factor by a slice type factor */

        static const uint32_t psyScaleFix8[3] = { 300, 256, 96 }; /* B, P, I */

        m_psyRd = (m_psyRdBase * psyScaleFix8[slice.m_sliceType]) >> 8;

        /* Scale PSY RD factor by QP, at high QP psy-rd can cause artifacts */

        if (qp >= 40)

        {

            int scale = qp >= QP_MAX_SPEC ? 0 : (QP_MAX_SPEC - qp) * 23;

            m_psyRd = (m_psyRd * scale) >> 8;

        }

        int qpCb, qpCr;

        if (slice.m_sps->chromaFormatIdc == X265_CSP_I420)

        {

            qpCb = (int)g_chromaScale[x265_clip3(QP_MIN, QP_MAX_MAX, qp + slice.m_pps->chromaQpOffset[0] + slice.m_chromaQpOffset[0])];

            qpCr = (int)g_chromaScale[x265_clip3(QP_MIN, QP_MAX_MAX, qp + slice.m_pps->chromaQpOffset[1] + slice.m_chromaQpOffset[1])];

        }

        else

        {

            qpCb = x265_clip3(QP_MIN, QP_MAX_SPEC, qp + slice.m_pps->chromaQpOffset[0] + slice.m_chromaQpOffset[0]);

            qpCr = x265_clip3(QP_MIN, QP_MAX_SPEC, qp + slice.m_pps->chromaQpOffset[1] + slice.m_chromaQpOffset[1]);

        }

        int chroma_offset_idx = X265_MIN(qp - qpCb + 12, MAX_CHROMA_LAMBDA_OFFSET);

        uint16_t lambdaOffset = x265_chroma_lambda2_offset_tab[chroma_offset_idx];

        m_chromaDistWeight[0] = lambdaOffset;

        chroma_offset_idx = X265_MIN(qp - qpCr + 12, MAX_CHROMA_LAMBDA_OFFSET);

        lambdaOffset = x265_chroma_lambda2_offset_tab[chroma_offset_idx];

        m_chromaDistWeight[1] = lambdaOffset;

    }

    void setLambda(double lambda2, double lambda)

    {

        m_lambda2 = (uint64_t)floor(256.0 * lambda2);

        m_lambda = (uint64_t)floor(256.0 * lambda);

    }

    inline uint64_t calcRdCost(sse_t distortion, uint32_t bits) const

    {

#if X265_DEPTH < 10

        X265_CHECK(bits <= (UINT64_MAX - 128) / m_lambda2,

                   "calcRdCost wrap detected dist: %u, bits %u, lambda: " X265_LL "\n",

                   distortion, bits, m_lambda2);

#else

        X265_CHECK(bits <= (UINT64_MAX - 128) / m_lambda2,

                   "calcRdCost wrap detected dist: " X265_LL ", bits %u, lambda: " X265_LL "\n",

                   distortion, bits, m_lambda2);

#endif

        return distortion + ((bits * m_lambda2 + 128) >> 8);

    }

    /* return the difference in energy between the source block and the recon block */

    inline int psyCost(int size, const pixel* source, intptr_t sstride, const pixel* recon, intptr_t rstride) const

    {

        return primitives.cu[size].psy_cost_pp(source, sstride, recon, rstride);

    }

    /* return the RD cost of this prediction, including the effect of psy-rd */

    inline uint64_t calcPsyRdCost(sse_t distortion, uint32_t bits, uint32_t psycost) const

    {

#if X265_DEPTH < 10

        X265_CHECK((bits <= (UINT64_MAX / m_lambda2)) && (psycost <= UINT64_MAX / (m_lambda * m_psyRd)),

                   "calcPsyRdCost wrap detected dist: %u, bits: %u, lambda: " X265_LL ", lambda2: " X265_LL "\n",

                   distortion, bits, m_lambda, m_lambda2);

#else

        X265_CHECK((bits <= (UINT64_MAX / m_lambda2)) && (psycost <= UINT64_MAX / (m_lambda * m_psyRd)),

                   "calcPsyRdCost wrap detected dist: " X265_LL ", bits: %u, lambda: " X265_LL ", lambda2: " X265_LL "\n",

                   distortion, bits, m_lambda, m_lambda2);

#endif

        return distortion + ((m_lambda * m_psyRd * psycost) >> 24) + ((bits * m_lambda2) >> 8);

    }

    inline uint64_t calcSsimRdCost(uint64_t distortion, uint32_t bits, uint32_t ssimCost) const

    {

#if X265_DEPTH < 10

        X265_CHECK((bits <= (UINT64_MAX / m_lambda2)) && (ssimCost <= UINT64_MAX / m_lambda),

                   "calcPsyRdCost wrap detected dist: " X265_LL " bits: %u, lambda: " X265_LL ", lambda2: " X265_LL "\n",

                   distortion, bits, m_lambda, m_lambda2);

#else

        X265_CHECK((bits <= (UINT64_MAX / m_lambda2)) && (ssimCost <= UINT64_MAX / m_lambda),

                   "calcPsyRdCost wrap detected dist: " X265_LL ", bits: %u, lambda: " X265_LL ", lambda2: " X265_LL "\n",

                   distortion, bits, m_lambda, m_lambda2);

#endif

        return distortion + ((m_lambda * ssimCost) >> 14) + ((bits * m_lambda2) >> 8);

    }

    inline uint64_t calcRdSADCost(uint32_t sadCost, uint32_t bits) const

    {

        X265_CHECK(bits <= (UINT64_MAX - 128) / m_lambda,

                   "calcRdSADCost wrap detected dist: %u, bits %u, lambda: " X265_LL "\n", sadCost, bits, m_lambda);

        return sadCost + ((bits * m_lambda + 128) >> 8);

    }

    inline sse_t scaleChromaDist(uint32_t plane, sse_t dist) const

    {

#if X265_DEPTH < 10

        X265_CHECK(dist <= (UINT64_MAX - 128) / m_chromaDistWeight[plane - 1],

                   "scaleChromaDist wrap detected dist: %u, lambda: %u\n",

                   dist, m_chromaDistWeight[plane - 1]);

#else

        X265_CHECK(dist <= (UINT64_MAX - 128) / m_chromaDistWeight[plane - 1],

                   "scaleChromaDist wrap detected dist: " X265_LL " lambda: %u\n",

                   dist, m_chromaDistWeight[plane - 1]);

#endif

        return (sse_t)((dist * (uint64_t)m_chromaDistWeight[plane - 1] + 128) >> 8);

    }

    inline uint32_t getCost(uint32_t bits) const

    {

        X265_CHECK(bits <= (UINT64_MAX - 128) / m_lambda,

                   "getCost wrap detected bits: %u, lambda: " X265_LL "\n", bits, m_lambda);

        return (uint32_t)((bits * m_lambda + 128) >> 8);

    }

};

}

#endif // ifndef X265_TCOMRDCOST_H