set.c
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/*****************************************************************************
* set.c: quantization init
*****************************************************************************
* Copyright (C) 2005-2024 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]);
}
}
#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;
}