384 lines
14 KiB
C
384 lines
14 KiB
C
/*****************************************************************************
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* set.c: quantization init
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*****************************************************************************
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* Copyright (C) 2005-2025 x264 project
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*
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* Authors: Loren Merritt <lorenm@u.washington.edu>
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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 licensing@x264.com.
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*****************************************************************************/
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#include "common.h"
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#define SHIFT(x,s) ((s)<=0 ? (x)<<-(s) : ((x)+(1<<((s)-1)))>>(s))
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#define DIV(n,d) (((n) + ((d)>>1)) / (d))
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static const uint8_t dequant4_scale[6][3] =
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{
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{ 10, 13, 16 },
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{ 11, 14, 18 },
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{ 13, 16, 20 },
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{ 14, 18, 23 },
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{ 16, 20, 25 },
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{ 18, 23, 29 }
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};
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static const uint16_t quant4_scale[6][3] =
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{
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{ 13107, 8066, 5243 },
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{ 11916, 7490, 4660 },
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{ 10082, 6554, 4194 },
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{ 9362, 5825, 3647 },
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{ 8192, 5243, 3355 },
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{ 7282, 4559, 2893 },
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};
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static const uint8_t quant8_scan[16] =
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{
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0,3,4,3, 3,1,5,1, 4,5,2,5, 3,1,5,1
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};
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static const uint8_t dequant8_scale[6][6] =
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{
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{ 20, 18, 32, 19, 25, 24 },
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{ 22, 19, 35, 21, 28, 26 },
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{ 26, 23, 42, 24, 33, 31 },
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{ 28, 25, 45, 26, 35, 33 },
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{ 32, 28, 51, 30, 40, 38 },
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{ 36, 32, 58, 34, 46, 43 },
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};
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static const uint16_t quant8_scale[6][6] =
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{
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{ 13107, 11428, 20972, 12222, 16777, 15481 },
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{ 11916, 10826, 19174, 11058, 14980, 14290 },
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{ 10082, 8943, 15978, 9675, 12710, 11985 },
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{ 9362, 8228, 14913, 8931, 11984, 11259 },
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{ 8192, 7346, 13159, 7740, 10486, 9777 },
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{ 7282, 6428, 11570, 6830, 9118, 8640 }
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};
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int x264_cqm_init( x264_t *h )
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{
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int def_quant4[6][16];
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int def_quant8[6][64];
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int def_dequant4[6][16];
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int def_dequant8[6][64];
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int quant4_mf[4][6][16];
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int quant8_mf[4][6][64];
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int deadzone[4] = { 32 - h->param.analyse.i_luma_deadzone[1],
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32 - h->param.analyse.i_luma_deadzone[0],
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32 - 11, 32 - 21 };
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int max_qp_err = -1;
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int max_chroma_qp_err = -1;
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int min_qp_err = QP_MAX+1;
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int num_8x8_lists = h->sps->i_chroma_format_idc == CHROMA_444 ? 4
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: h->param.analyse.b_transform_8x8 ? 2 : 0; /* Checkasm may segfault if optimized out by --chroma-format */
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#define CQM_ALLOC( w, count )\
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for( int i = 0; i < count; i++ )\
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{\
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int size = w*w;\
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int start = w == 8 ? 4 : 0;\
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int j;\
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for( j = 0; j < i; j++ )\
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if( !memcmp( h->sps->scaling_list[i+start], h->sps->scaling_list[j+start], size*sizeof(uint8_t) ) )\
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break;\
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if( j < i )\
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{\
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h-> quant##w##_mf[i] = h-> quant##w##_mf[j];\
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h->dequant##w##_mf[i] = h->dequant##w##_mf[j];\
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h->unquant##w##_mf[i] = h->unquant##w##_mf[j];\
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}\
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else\
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{\
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CHECKED_MALLOC( h-> quant##w##_mf[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\
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CHECKED_MALLOC( h->dequant##w##_mf[i], 6*size*sizeof(int) );\
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CHECKED_MALLOC( h->unquant##w##_mf[i], (QP_MAX_SPEC+1)*size*sizeof(int) );\
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}\
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for( j = 0; j < i; j++ )\
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if( deadzone[j] == deadzone[i] &&\
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!memcmp( h->sps->scaling_list[i+start], h->sps->scaling_list[j+start], size*sizeof(uint8_t) ) )\
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break;\
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if( j < i )\
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{\
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h->quant##w##_bias[i] = h->quant##w##_bias[j];\
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h->quant##w##_bias0[i] = h->quant##w##_bias0[j];\
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}\
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else\
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{\
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CHECKED_MALLOC( h->quant##w##_bias[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\
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CHECKED_MALLOC( h->quant##w##_bias0[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\
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}\
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}
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CQM_ALLOC( 4, 4 )
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CQM_ALLOC( 8, num_8x8_lists )
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for( int q = 0; q < 6; q++ )
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{
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for( int i = 0; i < 16; i++ )
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{
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int j = (i&1) + ((i>>2)&1);
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def_dequant4[q][i] = dequant4_scale[q][j];
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def_quant4[q][i] = quant4_scale[q][j];
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}
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for( int i = 0; i < 64; i++ )
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{
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int j = quant8_scan[((i>>1)&12) | (i&3)];
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def_dequant8[q][i] = dequant8_scale[q][j];
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def_quant8[q][i] = quant8_scale[q][j];
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}
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}
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for( int q = 0; q < 6; q++ )
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{
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for( int i_list = 0; i_list < 4; i_list++ )
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for( int i = 0; i < 16; i++ )
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{
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h->dequant4_mf[i_list][q][i] = def_dequant4[q][i] * h->sps->scaling_list[i_list][i];
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quant4_mf[i_list][q][i] = DIV(def_quant4[q][i] * 16, h->sps->scaling_list[i_list][i]);
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}
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for( int i_list = 0; i_list < num_8x8_lists; i_list++ )
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for( int i = 0; i < 64; i++ )
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{
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h->dequant8_mf[i_list][q][i] = def_dequant8[q][i] * h->sps->scaling_list[4+i_list][i];
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quant8_mf[i_list][q][i] = DIV(def_quant8[q][i] * 16, h->sps->scaling_list[4+i_list][i]);
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}
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}
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#define MAX_MF X264_MIN( 0xffff, (1 << (25 - BIT_DEPTH)) - 1 )
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for( int q = 0; q <= QP_MAX_SPEC; q++ )
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{
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int j;
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for( int i_list = 0; i_list < 4; i_list++ )
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for( int i = 0; i < 16; i++ )
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{
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h->unquant4_mf[i_list][q][i] = (1ULL << (q/6 + 15 + 8)) / quant4_mf[i_list][q%6][i];
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j = SHIFT(quant4_mf[i_list][q%6][i], q/6 - 1);
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h->quant4_mf[i_list][q][i] = (uint16_t)j;
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if( !j )
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{
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min_qp_err = X264_MIN( min_qp_err, q );
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continue;
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}
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// round to nearest, unless that would cause the deadzone to be negative
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h->quant4_bias[i_list][q][i] = X264_MIN( DIV(deadzone[i_list]<<10, j), (1<<15)/j );
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h->quant4_bias0[i_list][q][i] = (1<<15)/j;
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if( j > MAX_MF && q > max_qp_err && (i_list == CQM_4IY || i_list == CQM_4PY) )
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max_qp_err = q;
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if( j > MAX_MF && q > max_chroma_qp_err && (i_list == CQM_4IC || i_list == CQM_4PC) )
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max_chroma_qp_err = q;
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}
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if( h->param.analyse.b_transform_8x8 )
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for( int i_list = 0; i_list < num_8x8_lists; i_list++ )
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for( int i = 0; i < 64; i++ )
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{
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h->unquant8_mf[i_list][q][i] = (1ULL << (q/6 + 16 + 8)) / quant8_mf[i_list][q%6][i];
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j = SHIFT(quant8_mf[i_list][q%6][i], q/6);
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h->quant8_mf[i_list][q][i] = (uint16_t)j;
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if( !j )
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{
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min_qp_err = X264_MIN( min_qp_err, q );
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continue;
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}
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h->quant8_bias[i_list][q][i] = X264_MIN( DIV(deadzone[i_list]<<10, j), (1<<15)/j );
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h->quant8_bias0[i_list][q][i] = (1<<15)/j;
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if( j > MAX_MF && q > max_qp_err && (i_list == CQM_8IY || i_list == CQM_8PY) )
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max_qp_err = q;
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if( j > MAX_MF && q > max_chroma_qp_err && (i_list == CQM_8IC || i_list == CQM_8PC) )
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max_chroma_qp_err = q;
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}
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}
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/* Emergency mode denoising. */
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x264_emms();
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CHECKED_MALLOC( h->nr_offset_emergency, sizeof(*h->nr_offset_emergency)*(QP_MAX-QP_MAX_SPEC) );
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for( int q = 0; q < QP_MAX - QP_MAX_SPEC; q++ )
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for( int cat = 0; cat < 3 + CHROMA444; cat++ )
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{
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int dct8x8 = cat&1;
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if( !h->param.analyse.b_transform_8x8 && dct8x8 )
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continue;
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int size = dct8x8 ? 64 : 16;
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udctcoef *nr_offset = h->nr_offset_emergency[q][cat];
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/* Denoise chroma first (due to h264's chroma QP offset), then luma, then DC. */
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int dc_threshold = (QP_MAX-QP_MAX_SPEC)*2/3;
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int luma_threshold = (QP_MAX-QP_MAX_SPEC)*2/3;
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int chroma_threshold = 0;
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for( int i = 0; i < size; i++ )
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{
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int max = (1 << (7 + BIT_DEPTH)) - 1;
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/* True "emergency mode": remove all DCT coefficients */
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if( q == QP_MAX - QP_MAX_SPEC - 1 )
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{
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nr_offset[i] = max;
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continue;
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}
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int thresh = i == 0 ? dc_threshold : cat >= 2 ? chroma_threshold : luma_threshold;
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if( q < thresh )
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{
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nr_offset[i] = 0;
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continue;
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}
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double pos = (double)(q-thresh+1) / (QP_MAX - QP_MAX_SPEC - thresh);
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/* XXX: this math is largely tuned for /dev/random input. */
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double start = dct8x8 ? h->unquant8_mf[CQM_8PY][QP_MAX_SPEC][i]
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: h->unquant4_mf[CQM_4PY][QP_MAX_SPEC][i];
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/* Formula chosen as an exponential scale to vaguely mimic the effects
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* of a higher quantizer. */
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double bias = (pow( 2, pos*(QP_MAX - QP_MAX_SPEC)/10. )*0.003-0.003) * start;
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nr_offset[i] = X264_MIN( bias + 0.5, max );
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}
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}
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if( !h->mb.b_lossless )
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{
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while( h->chroma_qp_table[SPEC_QP(h->param.rc.i_qp_min)] <= max_chroma_qp_err )
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h->param.rc.i_qp_min++;
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if( min_qp_err <= h->param.rc.i_qp_max )
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h->param.rc.i_qp_max = min_qp_err-1;
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if( max_qp_err >= h->param.rc.i_qp_min )
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h->param.rc.i_qp_min = max_qp_err+1;
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/* If long level-codes aren't allowed, we need to allow QP high enough to avoid them. */
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if( !h->param.b_cabac && h->sps->i_profile_idc < PROFILE_HIGH )
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while( h->chroma_qp_table[SPEC_QP(h->param.rc.i_qp_max)] <= 12 || h->param.rc.i_qp_max <= 12 )
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h->param.rc.i_qp_max++;
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if( h->param.rc.i_qp_min > h->param.rc.i_qp_max )
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{
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x264_log( h, X264_LOG_ERROR, "Impossible QP constraints for CQM (min=%d, max=%d)\n", h->param.rc.i_qp_min, h->param.rc.i_qp_max );
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return -1;
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}
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}
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return 0;
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fail:
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x264_cqm_delete( h );
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return -1;
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}
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#define CQM_DELETE( n, max )\
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for( int i = 0; i < (max); i++ )\
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{\
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int j;\
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for( j = 0; j < i; j++ )\
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if( h->quant##n##_mf[i] == h->quant##n##_mf[j] )\
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break;\
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if( j == i )\
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{\
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x264_free( h-> quant##n##_mf[i] );\
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x264_free( h->dequant##n##_mf[i] );\
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x264_free( h->unquant##n##_mf[i] );\
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}\
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for( j = 0; j < i; j++ )\
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if( h->quant##n##_bias[i] == h->quant##n##_bias[j] )\
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break;\
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if( j == i )\
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{\
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x264_free( h->quant##n##_bias[i] );\
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x264_free( h->quant##n##_bias0[i] );\
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}\
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}
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void x264_cqm_delete( x264_t *h )
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{
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CQM_DELETE( 4, 4 );
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CQM_DELETE( 8, CHROMA444 ? 4 : 2 );
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x264_free( h->nr_offset_emergency );
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}
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static int cqm_parse_jmlist( x264_t *h, const char *buf, const char *name,
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uint8_t *cqm, const uint8_t *jvt, int length )
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{
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int i;
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char *p = strstr( buf, name );
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if( !p )
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{
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memset( cqm, 16, length );
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return 0;
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}
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p += strlen( name );
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if( *p == 'U' || *p == 'V' )
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p++;
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char *nextvar = strstr( p, "INT" );
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for( i = 0; i < length && (p = strpbrk( p, " \t\n," )) && (p = strpbrk( p, "0123456789" )); i++ )
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{
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int coef = -1;
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sscanf( p, "%d", &coef );
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if( i == 0 && coef == 0 )
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{
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memcpy( cqm, jvt, length );
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return 0;
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}
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if( coef < 1 || coef > 255 )
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{
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x264_log( h, X264_LOG_ERROR, "bad coefficient in list '%s'\n", name );
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return -1;
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}
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cqm[i] = coef;
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}
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if( (nextvar && p > nextvar) || i != length )
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{
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x264_log( h, X264_LOG_ERROR, "not enough coefficients in list '%s'\n", name );
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return -1;
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}
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return 0;
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}
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int x264_cqm_parse_file( x264_t *h, const char *filename )
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{
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char *p;
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int b_error = 0;
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h->param.i_cqm_preset = X264_CQM_CUSTOM;
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char *buf = x264_slurp_file( filename );
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if( !buf )
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{
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x264_log( h, X264_LOG_ERROR, "can't open file '%s'\n", filename );
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return -1;
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}
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while( (p = strchr( buf, '#' )) != NULL )
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memset( p, ' ', strcspn( p, "\n" ) );
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b_error |= cqm_parse_jmlist( h, buf, "INTRA4X4_LUMA", h->param.cqm_4iy, x264_cqm_jvt4i, 16 );
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b_error |= cqm_parse_jmlist( h, buf, "INTER4X4_LUMA", h->param.cqm_4py, x264_cqm_jvt4p, 16 );
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b_error |= cqm_parse_jmlist( h, buf, "INTRA4X4_CHROMA", h->param.cqm_4ic, x264_cqm_jvt4i, 16 );
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b_error |= cqm_parse_jmlist( h, buf, "INTER4X4_CHROMA", h->param.cqm_4pc, x264_cqm_jvt4p, 16 );
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b_error |= cqm_parse_jmlist( h, buf, "INTRA8X8_LUMA", h->param.cqm_8iy, x264_cqm_jvt8i, 64 );
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b_error |= cqm_parse_jmlist( h, buf, "INTER8X8_LUMA", h->param.cqm_8py, x264_cqm_jvt8p, 64 );
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if( CHROMA444 )
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{
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b_error |= cqm_parse_jmlist( h, buf, "INTRA8X8_CHROMA", h->param.cqm_8ic, x264_cqm_jvt8i, 64 );
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b_error |= cqm_parse_jmlist( h, buf, "INTER8X8_CHROMA", h->param.cqm_8pc, x264_cqm_jvt8p, 64 );
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}
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x264_free( buf );
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return b_error;
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}
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