91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/*****************************************************************************
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* Copyright (C) 2013 x265 project
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*
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* Authors: Steve Borho <steve@borho.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at license @ x265.com.
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*****************************************************************************/
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#include "common.h"
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#include "primitives.h"
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#include "bitcost.h"
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using namespace X265_NS;
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void BitCost::setQP(unsigned int qp)
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{
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if (!s_costs[qp])
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{
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ScopedLock s(s_costCalcLock);
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// Now that we have acquired the lock, check again if another thread calculated
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// this row while we were blocked
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if (!s_costs[qp])
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{
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x265_emms(); // just to be safe
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CalculateLogs();
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s_costs[qp] = new uint16_t[4 * BC_MAX_MV + 1] + 2 * BC_MAX_MV;
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double lambda = x265_lambda_tab[qp];
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// estimate same cost for negative and positive MVD
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for (int i = 0; i <= 2 * BC_MAX_MV; i++)
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s_costs[qp][i] = s_costs[qp][-i] = (uint16_t)X265_MIN(s_bitsizes[i] * lambda + 0.5f, (1 << 15) - 1);
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}
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}
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m_cost = s_costs[qp];
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}
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/***
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* Class static data and methods
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*/
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uint16_t *BitCost::s_costs[BC_MAX_QP];
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float *BitCost::s_bitsizes;
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Lock BitCost::s_costCalcLock;
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void BitCost::CalculateLogs()
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{
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if (!s_bitsizes)
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{
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s_bitsizes = new float[2 * BC_MAX_MV + 1];
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s_bitsizes[0] = 0.718f;
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float log2_2 = 2.0f / log(2.0f); // 2 x 1/log(2)
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for (int i = 1; i <= 2 * BC_MAX_MV; i++)
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s_bitsizes[i] = log((float)(i + 1)) * log2_2 + 1.718f;
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}
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}
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void BitCost::destroy()
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{
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for (int i = 0; i < BC_MAX_QP; i++)
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{
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if (s_costs[i])
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{
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delete [] (s_costs[i] - 2 * BC_MAX_MV);
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s_costs[i] = 0;
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}
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}
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delete [] s_bitsizes;
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s_bitsizes = 0;
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}
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