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- /*****************************************************************************
- * set.c: quantization init
- *****************************************************************************
- * Copyright (C) 2005-2018 x264 project
- *
- * Authors: Loren Merritt <lorenm@u.washington.edu>
- *
- * 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]);
- }
- }
- 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];
- h->quant4_mf[i_list][q][i] = j = SHIFT(quant4_mf[i_list][q%6][i], q/6 - 1);
- 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 > 0xffff && q > max_qp_err && (i_list == CQM_4IY || i_list == CQM_4PY) )
- max_qp_err = q;
- if( j > 0xffff && 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 > 0xffff && q > max_qp_err && (i_list == CQM_8IY || i_list == CQM_8PY) )
- max_qp_err = q;
- if( j > 0xffff && 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;
- }
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