/***************************************************************************** * set.c: quantization init ***************************************************************************** * Copyright (C) 2005-2022 x264 project * * Authors: Loren Merritt * * 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 licensing@x264.com. *****************************************************************************/ #include "common.h" #define SHIFT(x,s) ((s)<=0 ? (x)<<-(s) : ((x)+(1<<((s)-1)))>>(s)) #define DIV(n,d) (((n) + ((d)>>1)) / (d)) static const uint8_t dequant4_scale[6][3] = { { 10, 13, 16 }, { 11, 14, 18 }, { 13, 16, 20 }, { 14, 18, 23 }, { 16, 20, 25 }, { 18, 23, 29 } }; static const uint16_t quant4_scale[6][3] = { { 13107, 8066, 5243 }, { 11916, 7490, 4660 }, { 10082, 6554, 4194 }, { 9362, 5825, 3647 }, { 8192, 5243, 3355 }, { 7282, 4559, 2893 }, }; static const uint8_t quant8_scan[16] = { 0,3,4,3, 3,1,5,1, 4,5,2,5, 3,1,5,1 }; static const uint8_t dequant8_scale[6][6] = { { 20, 18, 32, 19, 25, 24 }, { 22, 19, 35, 21, 28, 26 }, { 26, 23, 42, 24, 33, 31 }, { 28, 25, 45, 26, 35, 33 }, { 32, 28, 51, 30, 40, 38 }, { 36, 32, 58, 34, 46, 43 }, }; static const uint16_t quant8_scale[6][6] = { { 13107, 11428, 20972, 12222, 16777, 15481 }, { 11916, 10826, 19174, 11058, 14980, 14290 }, { 10082, 8943, 15978, 9675, 12710, 11985 }, { 9362, 8228, 14913, 8931, 11984, 11259 }, { 8192, 7346, 13159, 7740, 10486, 9777 }, { 7282, 6428, 11570, 6830, 9118, 8640 } }; int x264_cqm_init( x264_t *h ) { int def_quant4[6][16]; int def_quant8[6][64]; int def_dequant4[6][16]; int def_dequant8[6][64]; int quant4_mf[4][6][16]; int quant8_mf[4][6][64]; int deadzone[4] = { 32 - h->param.analyse.i_luma_deadzone[1], 32 - h->param.analyse.i_luma_deadzone[0], 32 - 11, 32 - 21 }; int max_qp_err = -1; int max_chroma_qp_err = -1; int min_qp_err = QP_MAX+1; int num_8x8_lists = h->sps->i_chroma_format_idc == CHROMA_444 ? 4 : h->param.analyse.b_transform_8x8 ? 2 : 0; /* Checkasm may segfault if optimized out by --chroma-format */ #define CQM_ALLOC( w, count )\ for( int i = 0; i < count; i++ )\ {\ int size = w*w;\ int start = w == 8 ? 4 : 0;\ int j;\ for( j = 0; j < i; j++ )\ if( !memcmp( h->sps->scaling_list[i+start], h->sps->scaling_list[j+start], size*sizeof(uint8_t) ) )\ break;\ if( j < i )\ {\ h-> quant##w##_mf[i] = h-> quant##w##_mf[j];\ h->dequant##w##_mf[i] = h->dequant##w##_mf[j];\ h->unquant##w##_mf[i] = h->unquant##w##_mf[j];\ }\ else\ {\ CHECKED_MALLOC( h-> quant##w##_mf[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\ CHECKED_MALLOC( h->dequant##w##_mf[i], 6*size*sizeof(int) );\ CHECKED_MALLOC( h->unquant##w##_mf[i], (QP_MAX_SPEC+1)*size*sizeof(int) );\ }\ for( j = 0; j < i; j++ )\ if( deadzone[j] == deadzone[i] &&\ !memcmp( h->sps->scaling_list[i+start], h->sps->scaling_list[j+start], size*sizeof(uint8_t) ) )\ break;\ if( j < i )\ {\ h->quant##w##_bias[i] = h->quant##w##_bias[j];\ h->quant##w##_bias0[i] = h->quant##w##_bias0[j];\ }\ else\ {\ CHECKED_MALLOC( h->quant##w##_bias[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\ CHECKED_MALLOC( h->quant##w##_bias0[i], (QP_MAX_SPEC+1)*size*sizeof(udctcoef) );\ }\ } CQM_ALLOC( 4, 4 ) CQM_ALLOC( 8, num_8x8_lists ) for( int q = 0; q < 6; q++ ) { for( int i = 0; i < 16; i++ ) { int j = (i&1) + ((i>>2)&1); def_dequant4[q][i] = dequant4_scale[q][j]; def_quant4[q][i] = quant4_scale[q][j]; } for( int i = 0; i < 64; i++ ) { int j = quant8_scan[((i>>1)&12) | (i&3)]; def_dequant8[q][i] = dequant8_scale[q][j]; def_quant8[q][i] = quant8_scale[q][j]; } } for( int q = 0; q < 6; q++ ) { for( int i_list = 0; i_list < 4; i_list++ ) for( int i = 0; i < 16; i++ ) { h->dequant4_mf[i_list][q][i] = def_dequant4[q][i] * h->sps->scaling_list[i_list][i]; quant4_mf[i_list][q][i] = DIV(def_quant4[q][i] * 16, h->sps->scaling_list[i_list][i]); } for( int i_list = 0; i_list < num_8x8_lists; i_list++ ) for( int i = 0; i < 64; i++ ) { h->dequant8_mf[i_list][q][i] = def_dequant8[q][i] * h->sps->scaling_list[4+i_list][i]; quant8_mf[i_list][q][i] = DIV(def_quant8[q][i] * 16, h->sps->scaling_list[4+i_list][i]); } } #define MAX_MF X264_MIN( 0xffff, (1 << (25 - BIT_DEPTH)) - 1 ) for( int q = 0; q <= QP_MAX_SPEC; q++ ) { int j; for( int i_list = 0; i_list < 4; i_list++ ) for( int i = 0; i < 16; i++ ) { h->unquant4_mf[i_list][q][i] = (1ULL << (q/6 + 15 + 8)) / quant4_mf[i_list][q%6][i]; j = SHIFT(quant4_mf[i_list][q%6][i], q/6 - 1); h->quant4_mf[i_list][q][i] = (uint16_t)j; if( !j ) { min_qp_err = X264_MIN( min_qp_err, q ); continue; } // round to nearest, unless that would cause the deadzone to be negative h->quant4_bias[i_list][q][i] = X264_MIN( DIV(deadzone[i_list]<<10, j), (1<<15)/j ); h->quant4_bias0[i_list][q][i] = (1<<15)/j; if( j > MAX_MF && q > max_qp_err && (i_list == CQM_4IY || i_list == CQM_4PY) ) max_qp_err = q; if( j > MAX_MF && q > max_chroma_qp_err && (i_list == CQM_4IC || i_list == CQM_4PC) ) max_chroma_qp_err = q; } if( h->param.analyse.b_transform_8x8 ) for( int i_list = 0; i_list < num_8x8_lists; i_list++ ) for( int i = 0; i < 64; i++ ) { h->unquant8_mf[i_list][q][i] = (1ULL << (q/6 + 16 + 8)) / quant8_mf[i_list][q%6][i]; j = SHIFT(quant8_mf[i_list][q%6][i], q/6); h->quant8_mf[i_list][q][i] = (uint16_t)j; if( !j ) { min_qp_err = X264_MIN( min_qp_err, q ); continue; } h->quant8_bias[i_list][q][i] = X264_MIN( DIV(deadzone[i_list]<<10, j), (1<<15)/j ); h->quant8_bias0[i_list][q][i] = (1<<15)/j; if( j > MAX_MF && q > max_qp_err && (i_list == CQM_8IY || i_list == CQM_8PY) ) max_qp_err = q; if( j > MAX_MF && q > max_chroma_qp_err && (i_list == CQM_8IC || i_list == CQM_8PC) ) max_chroma_qp_err = q; } } /* Emergency mode denoising. */ x264_emms(); CHECKED_MALLOC( h->nr_offset_emergency, sizeof(*h->nr_offset_emergency)*(QP_MAX-QP_MAX_SPEC) ); for( int q = 0; q < QP_MAX - QP_MAX_SPEC; q++ ) for( int cat = 0; cat < 3 + CHROMA444; cat++ ) { int dct8x8 = cat&1; if( !h->param.analyse.b_transform_8x8 && dct8x8 ) continue; int size = dct8x8 ? 64 : 16; udctcoef *nr_offset = h->nr_offset_emergency[q][cat]; /* Denoise chroma first (due to h264's chroma QP offset), then luma, then DC. */ int dc_threshold = (QP_MAX-QP_MAX_SPEC)*2/3; int luma_threshold = (QP_MAX-QP_MAX_SPEC)*2/3; int chroma_threshold = 0; for( int i = 0; i < size; i++ ) { int max = (1 << (7 + BIT_DEPTH)) - 1; /* True "emergency mode": remove all DCT coefficients */ if( q == QP_MAX - QP_MAX_SPEC - 1 ) { nr_offset[i] = max; continue; } int thresh = i == 0 ? dc_threshold : cat >= 2 ? chroma_threshold : luma_threshold; if( q < thresh ) { nr_offset[i] = 0; continue; } double pos = (double)(q-thresh+1) / (QP_MAX - QP_MAX_SPEC - thresh); /* XXX: this math is largely tuned for /dev/random input. */ double start = dct8x8 ? h->unquant8_mf[CQM_8PY][QP_MAX_SPEC][i] : h->unquant4_mf[CQM_4PY][QP_MAX_SPEC][i]; /* Formula chosen as an exponential scale to vaguely mimic the effects * of a higher quantizer. */ double bias = (pow( 2, pos*(QP_MAX - QP_MAX_SPEC)/10. )*0.003-0.003) * start; nr_offset[i] = X264_MIN( bias + 0.5, max ); } } if( !h->mb.b_lossless ) { while( h->chroma_qp_table[SPEC_QP(h->param.rc.i_qp_min)] <= max_chroma_qp_err ) h->param.rc.i_qp_min++; if( min_qp_err <= h->param.rc.i_qp_max ) h->param.rc.i_qp_max = min_qp_err-1; if( max_qp_err >= h->param.rc.i_qp_min ) h->param.rc.i_qp_min = max_qp_err+1; /* If long level-codes aren't allowed, we need to allow QP high enough to avoid them. */ if( !h->param.b_cabac && h->sps->i_profile_idc < PROFILE_HIGH ) while( h->chroma_qp_table[SPEC_QP(h->param.rc.i_qp_max)] <= 12 || h->param.rc.i_qp_max <= 12 ) h->param.rc.i_qp_max++; if( h->param.rc.i_qp_min > h->param.rc.i_qp_max ) { 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 ); return -1; } } return 0; fail: x264_cqm_delete( h ); return -1; } #define CQM_DELETE( n, max )\ for( int i = 0; i < (max); i++ )\ {\ int j;\ for( j = 0; j < i; j++ )\ if( h->quant##n##_mf[i] == h->quant##n##_mf[j] )\ break;\ if( j == i )\ {\ x264_free( h-> quant##n##_mf[i] );\ x264_free( h->dequant##n##_mf[i] );\ x264_free( h->unquant##n##_mf[i] );\ }\ for( j = 0; j < i; j++ )\ if( h->quant##n##_bias[i] == h->quant##n##_bias[j] )\ break;\ if( j == i )\ {\ x264_free( h->quant##n##_bias[i] );\ x264_free( h->quant##n##_bias0[i] );\ }\ } void x264_cqm_delete( x264_t *h ) { CQM_DELETE( 4, 4 ); CQM_DELETE( 8, CHROMA444 ? 4 : 2 ); x264_free( h->nr_offset_emergency ); } static int cqm_parse_jmlist( x264_t *h, const char *buf, const char *name, uint8_t *cqm, const uint8_t *jvt, int length ) { int i; char *p = strstr( buf, name ); if( !p ) { memset( cqm, 16, length ); return 0; } p += strlen( name ); if( *p == 'U' || *p == 'V' ) p++; char *nextvar = strstr( p, "INT" ); for( i = 0; i < length && (p = strpbrk( p, " \t\n," )) && (p = strpbrk( p, "0123456789" )); i++ ) { int coef = -1; sscanf( p, "%d", &coef ); if( i == 0 && coef == 0 ) { memcpy( cqm, jvt, length ); return 0; } if( coef < 1 || coef > 255 ) { x264_log( h, X264_LOG_ERROR, "bad coefficient in list '%s'\n", name ); return -1; } cqm[i] = coef; } if( (nextvar && p > nextvar) || i != length ) { x264_log( h, X264_LOG_ERROR, "not enough coefficients in list '%s'\n", name ); return -1; } return 0; } int x264_cqm_parse_file( x264_t *h, const char *filename ) { char *p; int b_error = 0; h->param.i_cqm_preset = X264_CQM_CUSTOM; char *buf = x264_slurp_file( filename ); if( !buf ) { x264_log( h, X264_LOG_ERROR, "can't open file '%s'\n", filename ); return -1; } while( (p = strchr( buf, '#' )) != NULL ) memset( p, ' ', strcspn( p, "\n" ) ); b_error |= cqm_parse_jmlist( h, buf, "INTRA4X4_LUMA", h->param.cqm_4iy, x264_cqm_jvt4i, 16 ); b_error |= cqm_parse_jmlist( h, buf, "INTER4X4_LUMA", h->param.cqm_4py, x264_cqm_jvt4p, 16 ); b_error |= cqm_parse_jmlist( h, buf, "INTRA4X4_CHROMA", h->param.cqm_4ic, x264_cqm_jvt4i, 16 ); b_error |= cqm_parse_jmlist( h, buf, "INTER4X4_CHROMA", h->param.cqm_4pc, x264_cqm_jvt4p, 16 ); b_error |= cqm_parse_jmlist( h, buf, "INTRA8X8_LUMA", h->param.cqm_8iy, x264_cqm_jvt8i, 64 ); b_error |= cqm_parse_jmlist( h, buf, "INTER8X8_LUMA", h->param.cqm_8py, x264_cqm_jvt8p, 64 ); if( CHROMA444 ) { b_error |= cqm_parse_jmlist( h, buf, "INTRA8X8_CHROMA", h->param.cqm_8ic, x264_cqm_jvt8i, 64 ); b_error |= cqm_parse_jmlist( h, buf, "INTER8X8_CHROMA", h->param.cqm_8pc, x264_cqm_jvt8p, 64 ); } x264_free( buf ); return b_error; }