cabac.c
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上传日期:2021-12-09
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Audio
开发平台:
Visual C++
- /*****************************************************************************
- * cabac.c: h264 encoder library
- *****************************************************************************
- * Copyright (C) 2003-2008 x264 project
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- * 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.
- *****************************************************************************/
- #include "common/common.h"
- #include "macroblock.h"
- static inline void x264_cabac_mb_type_intra( x264_t *h, x264_cabac_t *cb, int i_mb_type,
- int ctx0, int ctx1, int ctx2, int ctx3, int ctx4, int ctx5 )
- {
- if( i_mb_type == I_4x4 || i_mb_type == I_8x8 )
- {
- x264_cabac_encode_decision( cb, ctx0, 0 );
- }
- else if( i_mb_type == I_PCM )
- {
- x264_cabac_encode_decision( cb, ctx0, 1 );
- x264_cabac_encode_flush( h, cb );
- }
- else
- {
- int i_pred = x264_mb_pred_mode16x16_fix[h->mb.i_intra16x16_pred_mode];
- x264_cabac_encode_decision( cb, ctx0, 1 );
- x264_cabac_encode_terminal( cb );
- x264_cabac_encode_decision( cb, ctx1, !!h->mb.i_cbp_luma );
- if( h->mb.i_cbp_chroma == 0 )
- {
- x264_cabac_encode_decision( cb, ctx2, 0 );
- }
- else
- {
- x264_cabac_encode_decision( cb, ctx2, 1 );
- x264_cabac_encode_decision( cb, ctx3, h->mb.i_cbp_chroma != 1 );
- }
- x264_cabac_encode_decision( cb, ctx4, i_pred>>1 );
- x264_cabac_encode_decision( cb, ctx5, i_pred&1 );
- }
- }
- static void x264_cabac_mb_type( x264_t *h, x264_cabac_t *cb )
- {
- const int i_mb_type = h->mb.i_type;
- if( h->sh.b_mbaff &&
- (!(h->mb.i_mb_y & 1) || IS_SKIP(h->mb.type[h->mb.i_mb_xy - h->mb.i_mb_stride])) )
- {
- x264_cabac_encode_decision( cb, 70 + h->mb.cache.i_neighbour_interlaced, h->mb.b_interlaced );
- }
- if( h->sh.i_type == SLICE_TYPE_I )
- {
- int ctx = 0;
- if( h->mb.i_mb_type_left >= 0 && h->mb.i_mb_type_left != I_4x4 )
- {
- ctx++;
- }
- if( h->mb.i_mb_type_top >= 0 && h->mb.i_mb_type_top != I_4x4 )
- {
- ctx++;
- }
- x264_cabac_mb_type_intra( h, cb, i_mb_type, 3+ctx, 3+3, 3+4, 3+5, 3+6, 3+7 );
- }
- else if( h->sh.i_type == SLICE_TYPE_P )
- {
- /* prefix: 14, suffix: 17 */
- if( i_mb_type == P_L0 )
- {
- if( h->mb.i_partition == D_16x16 )
- {
- x264_cabac_encode_decision( cb, 14, 0 );
- x264_cabac_encode_decision( cb, 15, 0 );
- x264_cabac_encode_decision( cb, 16, 0 );
- }
- else if( h->mb.i_partition == D_16x8 )
- {
- x264_cabac_encode_decision( cb, 14, 0 );
- x264_cabac_encode_decision( cb, 15, 1 );
- x264_cabac_encode_decision( cb, 17, 1 );
- }
- else if( h->mb.i_partition == D_8x16 )
- {
- x264_cabac_encode_decision( cb, 14, 0 );
- x264_cabac_encode_decision( cb, 15, 1 );
- x264_cabac_encode_decision( cb, 17, 0 );
- }
- }
- else if( i_mb_type == P_8x8 )
- {
- x264_cabac_encode_decision( cb, 14, 0 );
- x264_cabac_encode_decision( cb, 15, 0 );
- x264_cabac_encode_decision( cb, 16, 1 );
- }
- else /* intra */
- {
- /* prefix */
- x264_cabac_encode_decision( cb, 14, 1 );
- /* suffix */
- x264_cabac_mb_type_intra( h, cb, i_mb_type, 17+0, 17+1, 17+2, 17+2, 17+3, 17+3 );
- }
- }
- else if( h->sh.i_type == SLICE_TYPE_B )
- {
- int ctx = 0;
- if( h->mb.i_mb_type_left >= 0 && h->mb.i_mb_type_left != B_SKIP && h->mb.i_mb_type_left != B_DIRECT )
- {
- ctx++;
- }
- if( h->mb.i_mb_type_top >= 0 && h->mb.i_mb_type_top != B_SKIP && h->mb.i_mb_type_top != B_DIRECT )
- {
- ctx++;
- }
- if( i_mb_type == B_DIRECT )
- {
- x264_cabac_encode_decision( cb, 27+ctx, 0 );
- }
- else if( i_mb_type == B_8x8 )
- {
- x264_cabac_encode_decision( cb, 27+ctx, 1 );
- x264_cabac_encode_decision( cb, 27+3, 1 );
- x264_cabac_encode_decision( cb, 27+4, 1 );
- x264_cabac_encode_decision( cb, 27+5, 1 );
- x264_cabac_encode_decision( cb, 27+5, 1 );
- x264_cabac_encode_decision( cb, 27+5, 1 );
- }
- else if( IS_INTRA( i_mb_type ) )
- {
- /* prefix */
- x264_cabac_encode_decision( cb, 27+ctx, 1 );
- x264_cabac_encode_decision( cb, 27+3, 1 );
- x264_cabac_encode_decision( cb, 27+4, 1 );
- x264_cabac_encode_decision( cb, 27+5, 1 );
- x264_cabac_encode_decision( cb, 27+5, 0 );
- x264_cabac_encode_decision( cb, 27+5, 1 );
- /* suffix */
- x264_cabac_mb_type_intra( h, cb, i_mb_type, 32+0, 32+1, 32+2, 32+2, 32+3, 32+3 );
- }
- else
- {
- static const int i_mb_len[9*3] =
- {
- 6, 6, 3, /* L0 L0 */
- 6, 6, 0, /* L0 L1 */
- 7, 7, 0, /* L0 BI */
- 6, 6, 0, /* L1 L0 */
- 6, 6, 3, /* L1 L1 */
- 7, 7, 0, /* L1 BI */
- 7, 7, 0, /* BI L0 */
- 7, 7, 0, /* BI L1 */
- 7, 7, 6, /* BI BI */
- };
- static const int i_mb_bits[9*3][7] =
- {
- { 1,1,0,0,0,1 }, { 1,1,0,0,1,0, }, { 1,0,0 }, /* L0 L0 */
- { 1,1,0,1,0,1 }, { 1,1,0,1,1,0 }, {0}, /* L0 L1 */
- { 1,1,1,0,0,0,0 }, { 1,1,1,0,0,0,1 }, {0}, /* L0 BI */
- { 1,1,0,1,1,1 }, { 1,1,1,1,1,0 }, {0}, /* L1 L0 */
- { 1,1,0,0,1,1 }, { 1,1,0,1,0,0 }, { 1,0,1 }, /* L1 L1 */
- { 1,1,1,0,0,1,0 }, { 1,1,1,0,0,1,1 }, {0}, /* L1 BI */
- { 1,1,1,0,1,0,0 }, { 1,1,1,0,1,0,1 }, {0}, /* BI L0 */
- { 1,1,1,0,1,1,0 }, { 1,1,1,0,1,1,1 }, {0}, /* BI L1 */
- { 1,1,1,1,0,0,0 }, { 1,1,1,1,0,0,1 }, { 1,1,0,0,0,0 }, /* BI BI */
- };
- const int idx = (i_mb_type - B_L0_L0) * 3 + (h->mb.i_partition - D_16x8);
- int i;
- x264_cabac_encode_decision( cb, 27+ctx, i_mb_bits[idx][0] );
- x264_cabac_encode_decision( cb, 27+3, i_mb_bits[idx][1] );
- x264_cabac_encode_decision( cb, 27+5-i_mb_bits[idx][1], i_mb_bits[idx][2] );
- for( i = 3; i < i_mb_len[idx]; i++ )
- x264_cabac_encode_decision( cb, 27+5, i_mb_bits[idx][i] );
- }
- }
- else
- {
- x264_log(h, X264_LOG_ERROR, "unknown SLICE_TYPE unsupported in x264_macroblock_write_cabacn" );
- }
- }
- static void x264_cabac_mb_intra4x4_pred_mode( x264_cabac_t *cb, int i_pred, int i_mode )
- {
- if( i_pred == i_mode )
- {
- /* b_prev_intra4x4_pred_mode */
- x264_cabac_encode_decision( cb, 68, 1 );
- }
- else
- {
- /* b_prev_intra4x4_pred_mode */
- x264_cabac_encode_decision( cb, 68, 0 );
- if( i_mode > i_pred )
- {
- i_mode--;
- }
- x264_cabac_encode_decision( cb, 69, (i_mode )&0x01 );
- x264_cabac_encode_decision( cb, 69, (i_mode >> 1)&0x01 );
- x264_cabac_encode_decision( cb, 69, (i_mode >> 2)&0x01 );
- }
- }
- static void x264_cabac_mb_intra_chroma_pred_mode( x264_t *h, x264_cabac_t *cb )
- {
- const int i_mode = x264_mb_pred_mode8x8c_fix[ h->mb.i_chroma_pred_mode ];
- int ctx = 0;
- /* No need to test for I4x4 or I_16x16 as cache_save handle that */
- if( (h->mb.i_neighbour & MB_LEFT) && h->mb.chroma_pred_mode[h->mb.i_mb_xy - 1] != 0 )
- {
- ctx++;
- }
- if( (h->mb.i_neighbour & MB_TOP) && h->mb.chroma_pred_mode[h->mb.i_mb_top_xy] != 0 )
- {
- ctx++;
- }
- x264_cabac_encode_decision( cb, 64 + ctx, i_mode > 0 );
- if( i_mode > 0 )
- {
- x264_cabac_encode_decision( cb, 64 + 3, i_mode > 1 );
- if( i_mode > 1 )
- {
- x264_cabac_encode_decision( cb, 64 + 3, i_mode > 2 );
- }
- }
- }
- static void x264_cabac_mb_cbp_luma( x264_t *h, x264_cabac_t *cb )
- {
- int cbp = h->mb.i_cbp_luma;
- int cbp_l = h->mb.i_neighbour & MB_LEFT ? h->mb.cbp[h->mb.i_mb_xy - 1] : -1;
- int cbp_t = h->mb.i_neighbour & MB_TOP ? h->mb.cbp[h->mb.i_mb_top_xy] : -1;
- x264_cabac_encode_decision( cb, 76 - ((cbp_l >> 1) & 1) - ((cbp_t >> 1) & 2), (h->mb.i_cbp_luma >> 0) & 1 );
- x264_cabac_encode_decision( cb, 76 - ((cbp >> 0) & 1) - ((cbp_t >> 2) & 2), (h->mb.i_cbp_luma >> 1) & 1 );
- x264_cabac_encode_decision( cb, 76 - ((cbp_l >> 3) & 1) - ((cbp << 1) & 2), (h->mb.i_cbp_luma >> 2) & 1 );
- x264_cabac_encode_decision( cb, 76 - ((cbp >> 2) & 1) - ((cbp >> 0) & 2), (h->mb.i_cbp_luma >> 3) & 1 );
- }
- static void x264_cabac_mb_cbp_chroma( x264_t *h, x264_cabac_t *cb )
- {
- int cbp_a = -1;
- int cbp_b = -1;
- int ctx;
- /* No need to test for SKIP/PCM */
- if( h->mb.i_neighbour & MB_LEFT )
- {
- cbp_a = (h->mb.cbp[h->mb.i_mb_xy - 1] >> 4)&0x3;
- }
- if( h->mb.i_neighbour & MB_TOP )
- {
- cbp_b = (h->mb.cbp[h->mb.i_mb_top_xy] >> 4)&0x3;
- }
- ctx = 0;
- if( cbp_a > 0 ) ctx++;
- if( cbp_b > 0 ) ctx += 2;
- if( h->mb.i_cbp_chroma == 0 )
- {
- x264_cabac_encode_decision( cb, 77 + ctx, 0 );
- }
- else
- {
- x264_cabac_encode_decision( cb, 77 + ctx, 1 );
- ctx = 4;
- if( cbp_a == 2 ) ctx++;
- if( cbp_b == 2 ) ctx += 2;
- x264_cabac_encode_decision( cb, 77 + ctx, h->mb.i_cbp_chroma > 1 );
- }
- }
- /* TODO check it with != qp per mb */
- static void x264_cabac_mb_qp_delta( x264_t *h, x264_cabac_t *cb )
- {
- int i_mbn_xy = h->mb.i_mb_prev_xy;
- int i_dqp = h->mb.i_qp - h->mb.i_last_qp;
- int ctx;
- /* Avoid writing a delta quant if we have an empty i16x16 block, e.g. in a completely flat background area */
- if( h->mb.i_type == I_16x16 && !h->mb.cbp[h->mb.i_mb_xy] )
- {
- #ifndef RDO_SKIP_BS
- h->mb.i_qp = h->mb.i_last_qp;
- #endif
- i_dqp = 0;
- }
- /* No need to test for PCM / SKIP */
- if( h->mb.i_last_dqp &&
- ( h->mb.type[i_mbn_xy] == I_16x16 || (h->mb.cbp[i_mbn_xy]&0x3f) ) )
- ctx = 1;
- else
- ctx = 0;
- if( i_dqp != 0 )
- {
- int val = i_dqp <= 0 ? (-2*i_dqp) : (2*i_dqp - 1);
- /* dqp is interpreted modulo 52 */
- if( val >= 51 && val != 52 )
- val = 103 - val;
- while( val-- )
- {
- x264_cabac_encode_decision( cb, 60 + ctx, 1 );
- if( ctx < 2 )
- ctx = 2;
- else
- ctx = 3;
- }
- }
- x264_cabac_encode_decision( cb, 60 + ctx, 0 );
- }
- #ifndef RDO_SKIP_BS
- void x264_cabac_mb_skip( x264_t *h, int b_skip )
- {
- int ctx = (h->mb.i_mb_type_left >= 0 && !IS_SKIP( h->mb.i_mb_type_left ))
- + (h->mb.i_mb_type_top >= 0 && !IS_SKIP( h->mb.i_mb_type_top ))
- + (h->sh.i_type == SLICE_TYPE_P ? 11 : 24);
- x264_cabac_encode_decision( &h->cabac, ctx, b_skip );
- }
- #endif
- static inline void x264_cabac_mb_sub_p_partition( x264_cabac_t *cb, int i_sub )
- {
- if( i_sub == D_L0_8x8 )
- {
- x264_cabac_encode_decision( cb, 21, 1 );
- }
- else if( i_sub == D_L0_8x4 )
- {
- x264_cabac_encode_decision( cb, 21, 0 );
- x264_cabac_encode_decision( cb, 22, 0 );
- }
- else if( i_sub == D_L0_4x8 )
- {
- x264_cabac_encode_decision( cb, 21, 0 );
- x264_cabac_encode_decision( cb, 22, 1 );
- x264_cabac_encode_decision( cb, 23, 1 );
- }
- else if( i_sub == D_L0_4x4 )
- {
- x264_cabac_encode_decision( cb, 21, 0 );
- x264_cabac_encode_decision( cb, 22, 1 );
- x264_cabac_encode_decision( cb, 23, 0 );
- }
- }
- static NOINLINE void x264_cabac_mb_sub_b_partition( x264_cabac_t *cb, int i_sub )
- {
- static const uint8_t part_bits[12][7] = {
- {6,1,1,1,0,1,1}, // D_L0_4x4
- {5,1,1,0,0,1}, // D_L0_8x4
- {5,1,1,0,1,0}, // D_L0_4x8
- {3,1,0,0}, // D_L0_8x8
- {5,1,1,1,1,0}, // D_L1_4x4
- {5,1,1,0,1,1}, // D_L1_8x4
- {6,1,1,1,0,0,0}, // D_L1_4x8
- {3,1,0,1}, // D_L1_8x8
- {5,1,1,1,1,1}, // D_BI_4x4
- {6,1,1,1,0,0,1}, // D_BI_8x4
- {6,1,1,1,0,1,0}, // D_BI_4x8
- {5,1,1,0,0,0}, // D_BI_8x8
- };
- int len;
- if( i_sub == D_DIRECT_8x8 )
- {
- x264_cabac_encode_decision( cb, 36, 0 );
- return;
- }
- len = part_bits[i_sub][0];
- x264_cabac_encode_decision( cb, 36, part_bits[i_sub][1] );
- x264_cabac_encode_decision( cb, 37, part_bits[i_sub][2] );
- if( len == 3 )
- x264_cabac_encode_decision( cb, 39, part_bits[i_sub][3] );
- else
- {
- x264_cabac_encode_decision( cb, 38, part_bits[i_sub][3] );
- x264_cabac_encode_decision( cb, 39, part_bits[i_sub][4] );
- x264_cabac_encode_decision( cb, 39, part_bits[i_sub][5] );
- if( len == 6 )
- x264_cabac_encode_decision( cb, 39, part_bits[i_sub][6] );
- }
- }
- static inline void x264_cabac_mb_transform_size( x264_t *h, x264_cabac_t *cb )
- {
- int ctx = 399 + h->mb.cache.i_neighbour_transform_size;
- x264_cabac_encode_decision( cb, ctx, h->mb.b_transform_8x8 );
- }
- static inline void x264_cabac_mb_ref( x264_t *h, x264_cabac_t *cb, int i_list, int idx )
- {
- const int i8 = x264_scan8[idx];
- const int i_refa = h->mb.cache.ref[i_list][i8 - 1];
- const int i_refb = h->mb.cache.ref[i_list][i8 - 8];
- int i_ref = h->mb.cache.ref[i_list][i8];
- int ctx = 0;
- if( i_refa > 0 && !h->mb.cache.skip[i8 - 1])
- ctx++;
- if( i_refb > 0 && !h->mb.cache.skip[i8 - 8])
- ctx += 2;
- while( i_ref > 0 )
- {
- x264_cabac_encode_decision( cb, 54 + ctx, 1 );
- if( ctx < 4 )
- ctx = 4;
- else
- ctx = 5;
- i_ref--;
- }
- x264_cabac_encode_decision( cb, 54 + ctx, 0 );
- }
- static inline void x264_cabac_mb_mvd_cpn( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int l, int mvd )
- {
- static const uint8_t transition[7] = { 3,3,3,4,5,6,6 };
- const int amvd = abs( h->mb.cache.mvd[i_list][x264_scan8[idx] - 1][l] ) +
- abs( h->mb.cache.mvd[i_list][x264_scan8[idx] - 8][l] );
- const int i_abs = abs( mvd );
- const int i_prefix = X264_MIN( i_abs, 9 );
- const int ctxbase = l ? 47 : 40;
- int ctx = (amvd>2) + (amvd>32);
- int i;
- for( i = 0; i < i_prefix; i++ )
- {
- x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
- ctx = transition[ctx];
- }
- if( i_prefix < 9 )
- x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
- else
- x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
- /* sign */
- if( mvd )
- x264_cabac_encode_bypass( cb, mvd < 0 );
- }
- static inline void x264_cabac_mb_mvd( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int width, int height )
- {
- DECLARE_ALIGNED_4( int16_t mvp[2] );
- int mdx, mdy;
- /* Calculate mvd */
- x264_mb_predict_mv( h, i_list, idx, width, mvp );
- mdx = h->mb.cache.mv[i_list][x264_scan8[idx]][0] - mvp[0];
- mdy = h->mb.cache.mv[i_list][x264_scan8[idx]][1] - mvp[1];
- /* encode */
- x264_cabac_mb_mvd_cpn( h, cb, i_list, idx, 0, mdx );
- x264_cabac_mb_mvd_cpn( h, cb, i_list, idx, 1, mdy );
- /* save value */
- x264_macroblock_cache_mvd( h, block_idx_x[idx], block_idx_y[idx], width, height, i_list, pack16to32_mask(mdx,mdy) );
- }
- static inline void x264_cabac_mb8x8_mvd( x264_t *h, x264_cabac_t *cb, int i_list, int i )
- {
- if( !x264_mb_partition_listX_table[i_list][ h->mb.i_sub_partition[i] ] )
- return;
- switch( h->mb.i_sub_partition[i] )
- {
- case D_L0_8x8:
- case D_L1_8x8:
- case D_BI_8x8:
- x264_cabac_mb_mvd( h, cb, i_list, 4*i, 2, 2 );
- break;
- case D_L0_8x4:
- case D_L1_8x4:
- case D_BI_8x4:
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+0, 2, 1 );
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+2, 2, 1 );
- break;
- case D_L0_4x8:
- case D_L1_4x8:
- case D_BI_4x8:
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+0, 1, 2 );
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+1, 1, 2 );
- break;
- case D_L0_4x4:
- case D_L1_4x4:
- case D_BI_4x4:
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+0, 1, 1 );
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+1, 1, 1 );
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+2, 1, 1 );
- x264_cabac_mb_mvd( h, cb, i_list, 4*i+3, 1, 1 );
- break;
- }
- }
- static int x264_cabac_mb_cbf_ctxidxinc( x264_t *h, int i_cat, int i_idx )
- {
- /* i_ctxBlockCat: 0-> DC 16x16 i_idx = 0
- * 1-> AC 16x16 i_idx = luma4x4idx
- * 2-> Luma4x4 i_idx = luma4x4idx
- * 3-> DC Chroma i_idx = iCbCr
- * 4-> AC Chroma i_idx = 4 * iCbCr + chroma4x4idx
- * 5-> Luma8x8 i_idx = luma8x8idx
- */
- int i_mba_xy = -1;
- int i_mbb_xy = -1;
- int i_nza = 0;
- int i_nzb = 0;
- if( i_cat == DCT_LUMA_DC )
- {
- if( h->mb.i_neighbour & MB_LEFT )
- {
- i_mba_xy = h->mb.i_mb_xy - 1;
- i_nza = h->mb.cbp[i_mba_xy] & 0x100;
- }
- if( h->mb.i_neighbour & MB_TOP )
- {
- i_mbb_xy = h->mb.i_mb_top_xy;
- i_nzb = h->mb.cbp[i_mbb_xy] & 0x100;
- }
- }
- else if( i_cat == DCT_LUMA_AC || i_cat == DCT_LUMA_4x4 )
- {
- if( i_idx & ~10 ) // block_idx_x > 0
- i_mba_xy = h->mb.i_mb_xy;
- else if( h->mb.i_neighbour & MB_LEFT )
- i_mba_xy = h->mb.i_mb_xy - 1;
- if( i_idx & ~5 ) // block_idx_y > 0
- i_mbb_xy = h->mb.i_mb_xy;
- else if( h->mb.i_neighbour & MB_TOP )
- i_mbb_xy = h->mb.i_mb_top_xy;
- /* no need to test for skip/pcm */
- if( i_mba_xy >= 0 )
- i_nza = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 1];
- if( i_mbb_xy >= 0 )
- i_nzb = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 8];
- }
- else if( i_cat == DCT_CHROMA_DC )
- {
- /* no need to test skip/pcm */
- if( h->mb.i_neighbour & MB_LEFT )
- {
- i_mba_xy = h->mb.i_mb_xy - 1;
- i_nza = h->mb.cbp[i_mba_xy] & (0x200 << i_idx);
- }
- if( h->mb.i_neighbour & MB_TOP )
- {
- i_mbb_xy = h->mb.i_mb_top_xy;
- i_nzb = h->mb.cbp[i_mbb_xy] & (0x200 << i_idx);
- }
- }
- else if( i_cat == DCT_CHROMA_AC )
- {
- if( i_idx & 1 )
- i_mba_xy = h->mb.i_mb_xy;
- else if( h->mb.i_neighbour & MB_LEFT )
- i_mba_xy = h->mb.i_mb_xy - 1;
- if( i_idx & 2 )
- i_mbb_xy = h->mb.i_mb_xy;
- else if( h->mb.i_neighbour & MB_TOP )
- i_mbb_xy = h->mb.i_mb_top_xy;
- /* no need to test skip/pcm */
- if( i_mba_xy >= 0 )
- i_nza = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 1];
- if( i_mbb_xy >= 0 )
- i_nzb = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 8];
- }
- if( IS_INTRA( h->mb.i_type ) )
- {
- i_nza |= i_mba_xy < 0;
- i_nzb |= i_mbb_xy < 0;
- }
- return 4*i_cat + 2*!!i_nzb + !!i_nza;
- }
- static const uint16_t significant_coeff_flag_offset[2][6] = {
- { 105, 120, 134, 149, 152, 402 },
- { 277, 292, 306, 321, 324, 436 }
- };
- static const uint16_t last_coeff_flag_offset[2][6] = {
- { 166, 181, 195, 210, 213, 417 },
- { 338, 353, 367, 382, 385, 451 }
- };
- static const uint16_t coeff_abs_level_m1_offset[6] =
- { 227, 237, 247, 257, 266, 426 };
- static const uint8_t significant_coeff_flag_offset_8x8[2][63] =
- {{
- 0, 1, 2, 3, 4, 5, 5, 4, 4, 3, 3, 4, 4, 4, 5, 5,
- 4, 4, 4, 4, 3, 3, 6, 7, 7, 7, 8, 9,10, 9, 8, 7,
- 7, 6,11,12,13,11, 6, 7, 8, 9,14,10, 9, 8, 6,11,
- 12,13,11, 6, 9,14,10, 9,11,12,13,11,14,10,12
- },{
- 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 7, 7, 8, 4, 5,
- 6, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,11,12,11,
- 9, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,13,13, 9,
- 9,10,10, 8,13,13, 9, 9,10,10,14,14,14,14,14
- }};
- static const uint8_t last_coeff_flag_offset_8x8[63] = {
- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
- 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
- };
- static const uint8_t identity[16] =
- { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
- // node ctx: 0..3: abslevel1 (with abslevelgt1 == 0).
- // 4..7: abslevelgt1 + 3 (and abslevel1 doesn't matter).
- /* map node ctx => cabac ctx for level=1 */
- static const int coeff_abs_level1_ctx[8] = { 1, 2, 3, 4, 0, 0, 0, 0 };
- /* map node ctx => cabac ctx for level>1 */
- static const int coeff_abs_levelgt1_ctx[8] = { 5, 5, 5, 5, 6, 7, 8, 9 };
- static const uint8_t coeff_abs_level_transition[2][8] = {
- /* update node ctx after coding a level=1 */
- { 1, 2, 3, 3, 4, 5, 6, 7 },
- /* update node ctx after coding a level>1 */
- { 4, 4, 4, 4, 5, 6, 7, 7 }
- };
- static void block_residual_write_cabac( x264_t *h, x264_cabac_t *cb, int i_ctxBlockCat, int i_idx, int16_t *l, int i_count )
- {
- const int i_ctx_sig = significant_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
- const int i_ctx_last = last_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
- const int i_ctx_level = coeff_abs_level_m1_offset[i_ctxBlockCat];
- int i_coeff_abs_m1[64];
- int UNUSED i_coeff_sign[64];
- int i_coeff = 0;
- int i_last = 0;
- int i_sigmap_size;
- int node_ctx = 0;
- int i, j;
- const uint8_t *significant_coeff_flag_offset;
- const uint8_t *last_coeff_flag_offset;
- /* yes this is always aligned, and l[-1] exists in the cases where it's used (ac) */
- for( j = i_count - 4; j >= -1; j -= 4 )
- if( *(uint64_t*)(l+j) )
- break;
- if( i_count != 64 )
- {
- /* coded block flag */
- int ctx = 85 + x264_cabac_mb_cbf_ctxidxinc( h, i_ctxBlockCat, i_idx );
- if( j >= -1 )
- x264_cabac_encode_decision( cb, ctx, 1 );
- else
- {
- x264_cabac_encode_decision( cb, ctx, 0 );
- return;
- }
- }
- significant_coeff_flag_offset = (i_ctxBlockCat == DCT_LUMA_8x8)
- ? significant_coeff_flag_offset_8x8[h->mb.b_interlaced]
- : identity;
- last_coeff_flag_offset = (i_ctxBlockCat == DCT_LUMA_8x8)
- ? last_coeff_flag_offset_8x8 : identity;
- for( i = j; i < j+4; i++)
- if( l[i] )
- i_last = i;
- i_sigmap_size = X264_MIN( i_last+1, i_count-1 );
- for( i = 0; i < i_sigmap_size; i++ )
- {
- if( l[i] )
- {
- i_coeff_abs_m1[i_coeff] = abs(l[i]) - 1;
- #ifndef RDO_SKIP_BS
- i_coeff_sign[i_coeff] = l[i] < 0;
- #endif
- i_coeff++;
- x264_cabac_encode_decision( cb, i_ctx_sig + significant_coeff_flag_offset[i], 1 );
- x264_cabac_encode_decision( cb, i_ctx_last + last_coeff_flag_offset[i], i == i_last );
- }
- else
- x264_cabac_encode_decision( cb, i_ctx_sig + significant_coeff_flag_offset[i], 0 );
- }
- if( i == i_last )
- {
- i_coeff_abs_m1[i_coeff] = abs(l[i]) - 1;
- #ifndef RDO_SKIP_BS
- i_coeff_sign[i_coeff] = l[i] < 0;
- #endif
- i_coeff++;
- }
- do
- {
- int i_prefix, ctx;
- i_coeff--;
- /* write coeff_abs - 1 */
- i_prefix = X264_MIN( i_coeff_abs_m1[i_coeff], 14 );
- ctx = coeff_abs_level1_ctx[node_ctx] + i_ctx_level;
- if( i_prefix )
- {
- x264_cabac_encode_decision( cb, ctx, 1 );
- ctx = coeff_abs_levelgt1_ctx[node_ctx] + i_ctx_level;
- #ifdef RDO_SKIP_BS
- cb->f8_bits_encoded += cabac_prefix_size[i_prefix][cb->state[ctx]];
- cb->state[ctx] = cabac_prefix_transition[i_prefix][cb->state[ctx]];
- #else
- for( j = 0; j < i_prefix - 1; j++ )
- x264_cabac_encode_decision( cb, ctx, 1 );
- if( i_prefix < 14 )
- x264_cabac_encode_decision( cb, ctx, 0 );
- #endif
- if( i_prefix >= 14 )
- x264_cabac_encode_ue_bypass( cb, 0, i_coeff_abs_m1[i_coeff] - 14 );
- node_ctx = coeff_abs_level_transition[1][node_ctx];
- }
- else
- {
- x264_cabac_encode_decision( cb, ctx, 0 );
- node_ctx = coeff_abs_level_transition[0][node_ctx];
- #ifdef RDO_SKIP_BS
- x264_cabac_encode_bypass( cb, 0 ); // sign
- #endif
- }
- #ifndef RDO_SKIP_BS
- x264_cabac_encode_bypass( cb, i_coeff_sign[i_coeff] );
- #endif
- } while( i_coeff > 0 );
- }
- void x264_macroblock_write_cabac( x264_t *h, x264_cabac_t *cb )
- {
- const int i_mb_type = h->mb.i_type;
- int i_list;
- int i;
- #ifndef RDO_SKIP_BS
- const int i_mb_pos_start = x264_cabac_pos( cb );
- int i_mb_pos_tex;
- #endif
- /* Write the MB type */
- x264_cabac_mb_type( h, cb );
- #ifndef RDO_SKIP_BS
- if( i_mb_type == I_PCM )
- {
- i_mb_pos_tex = x264_cabac_pos( cb );
- h->stat.frame.i_mv_bits += i_mb_pos_tex - i_mb_pos_start;
- memcpy( cb->p, h->mb.pic.p_fenc[0], 256 );
- cb->p += 256;
- for( i = 0; i < 8; i++ )
- memcpy( cb->p + i*8, h->mb.pic.p_fenc[1] + i*FENC_STRIDE, 8 );
- cb->p += 64;
- for( i = 0; i < 8; i++ )
- memcpy( cb->p + i*8, h->mb.pic.p_fenc[2] + i*FENC_STRIDE, 8 );
- cb->p += 64;
- cb->i_low = 0;
- cb->i_range = 0x01FE;
- cb->i_queue = -1;
- cb->i_bytes_outstanding = 0;
- /* if PCM is chosen, we need to store reconstructed frame data */
- h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[0], FDEC_STRIDE, h->mb.pic.p_fenc[0], FENC_STRIDE, 16 );
- h->mc.copy[PIXEL_8x8] ( h->mb.pic.p_fdec[1], FDEC_STRIDE, h->mb.pic.p_fenc[1], FENC_STRIDE, 8 );
- h->mc.copy[PIXEL_8x8] ( h->mb.pic.p_fdec[2], FDEC_STRIDE, h->mb.pic.p_fenc[2], FENC_STRIDE, 8 );
- h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
- return;
- }
- #endif
- if( IS_INTRA( i_mb_type ) )
- {
- if( h->pps->b_transform_8x8_mode && i_mb_type != I_16x16 )
- x264_cabac_mb_transform_size( h, cb );
- if( i_mb_type != I_16x16 )
- {
- int di = (i_mb_type == I_8x8) ? 4 : 1;
- for( i = 0; i < 16; i += di )
- {
- const int i_pred = x264_mb_predict_intra4x4_mode( h, i );
- const int i_mode = x264_mb_pred_mode4x4_fix( h->mb.cache.intra4x4_pred_mode[x264_scan8[i]] );
- x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
- }
- }
- x264_cabac_mb_intra_chroma_pred_mode( h, cb );
- }
- else if( i_mb_type == P_L0 )
- {
- if( h->mb.i_partition == D_16x16 )
- {
- if( h->mb.pic.i_fref[0] > 1 )
- {
- x264_cabac_mb_ref( h, cb, 0, 0 );
- }
- x264_cabac_mb_mvd( h, cb, 0, 0, 4, 4 );
- }
- else if( h->mb.i_partition == D_16x8 )
- {
- if( h->mb.pic.i_fref[0] > 1 )
- {
- x264_cabac_mb_ref( h, cb, 0, 0 );
- x264_cabac_mb_ref( h, cb, 0, 8 );
- }
- x264_cabac_mb_mvd( h, cb, 0, 0, 4, 2 );
- x264_cabac_mb_mvd( h, cb, 0, 8, 4, 2 );
- }
- else if( h->mb.i_partition == D_8x16 )
- {
- if( h->mb.pic.i_fref[0] > 1 )
- {
- x264_cabac_mb_ref( h, cb, 0, 0 );
- x264_cabac_mb_ref( h, cb, 0, 4 );
- }
- x264_cabac_mb_mvd( h, cb, 0, 0, 2, 4 );
- x264_cabac_mb_mvd( h, cb, 0, 4, 2, 4 );
- }
- }
- else if( i_mb_type == P_8x8 )
- {
- /* sub mb type */
- x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[0] );
- x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[1] );
- x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[2] );
- x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[3] );
- /* ref 0 */
- if( h->mb.pic.i_fref[0] > 1 )
- {
- x264_cabac_mb_ref( h, cb, 0, 0 );
- x264_cabac_mb_ref( h, cb, 0, 4 );
- x264_cabac_mb_ref( h, cb, 0, 8 );
- x264_cabac_mb_ref( h, cb, 0, 12 );
- }
- for( i = 0; i < 4; i++ )
- x264_cabac_mb8x8_mvd( h, cb, 0, i );
- }
- else if( i_mb_type == B_8x8 )
- {
- /* sub mb type */
- x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[0] );
- x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[1] );
- x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[2] );
- x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[3] );
- /* ref */
- for( i_list = 0; i_list < 2; i_list++ )
- {
- if( ( i_list ? h->mb.pic.i_fref[1] : h->mb.pic.i_fref[0] ) == 1 )
- continue;
- for( i = 0; i < 4; i++ )
- if( x264_mb_partition_listX_table[i_list][ h->mb.i_sub_partition[i] ] )
- x264_cabac_mb_ref( h, cb, i_list, 4*i );
- }
- for( i = 0; i < 4; i++ )
- x264_cabac_mb8x8_mvd( h, cb, 0, i );
- for( i = 0; i < 4; i++ )
- x264_cabac_mb8x8_mvd( h, cb, 1, i );
- }
- else if( i_mb_type != B_DIRECT )
- {
- /* All B mode */
- int b_list[2][2];
- /* init ref list utilisations */
- for( i = 0; i < 2; i++ )
- {
- b_list[0][i] = x264_mb_type_list0_table[i_mb_type][i];
- b_list[1][i] = x264_mb_type_list1_table[i_mb_type][i];
- }
- for( i_list = 0; i_list < 2; i_list++ )
- {
- const int i_ref_max = i_list == 0 ? h->mb.pic.i_fref[0] : h->mb.pic.i_fref[1];
- if( i_ref_max > 1 )
- {
- if( h->mb.i_partition == D_16x16 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_ref( h, cb, i_list, 0 );
- }
- else if( h->mb.i_partition == D_16x8 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_ref( h, cb, i_list, 0 );
- if( b_list[i_list][1] ) x264_cabac_mb_ref( h, cb, i_list, 8 );
- }
- else if( h->mb.i_partition == D_8x16 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_ref( h, cb, i_list, 0 );
- if( b_list[i_list][1] ) x264_cabac_mb_ref( h, cb, i_list, 4 );
- }
- }
- }
- for( i_list = 0; i_list < 2; i_list++ )
- {
- if( h->mb.i_partition == D_16x16 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 4, 4 );
- }
- else if( h->mb.i_partition == D_16x8 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 4, 2 );
- if( b_list[i_list][1] ) x264_cabac_mb_mvd( h, cb, i_list, 8, 4, 2 );
- }
- else if( h->mb.i_partition == D_8x16 )
- {
- if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 2, 4 );
- if( b_list[i_list][1] ) x264_cabac_mb_mvd( h, cb, i_list, 4, 2, 4 );
- }
- }
- }
- #ifndef RDO_SKIP_BS
- i_mb_pos_tex = x264_cabac_pos( cb );
- h->stat.frame.i_mv_bits += i_mb_pos_tex - i_mb_pos_start;
- #endif
- if( i_mb_type != I_16x16 )
- {
- x264_cabac_mb_cbp_luma( h, cb );
- x264_cabac_mb_cbp_chroma( h, cb );
- }
- if( x264_mb_transform_8x8_allowed( h ) && h->mb.i_cbp_luma )
- {
- x264_cabac_mb_transform_size( h, cb );
- }
- if( h->mb.i_cbp_luma > 0 || h->mb.i_cbp_chroma > 0 || i_mb_type == I_16x16 )
- {
- x264_cabac_mb_qp_delta( h, cb );
- /* write residual */
- if( i_mb_type == I_16x16 )
- {
- /* DC Luma */
- block_residual_write_cabac( h, cb, DCT_LUMA_DC, 0, h->dct.luma16x16_dc, 16 );
- /* AC Luma */
- if( h->mb.i_cbp_luma != 0 )
- for( i = 0; i < 16; i++ )
- block_residual_write_cabac( h, cb, DCT_LUMA_AC, i, h->dct.luma4x4[i]+1, 15 );
- }
- else if( h->mb.b_transform_8x8 )
- {
- for( i = 0; i < 4; i++ )
- if( h->mb.i_cbp_luma & ( 1 << i ) )
- block_residual_write_cabac( h, cb, DCT_LUMA_8x8, i, h->dct.luma8x8[i], 64 );
- }
- else
- {
- for( i = 0; i < 16; i++ )
- if( h->mb.i_cbp_luma & ( 1 << ( i / 4 ) ) )
- block_residual_write_cabac( h, cb, DCT_LUMA_4x4, i, h->dct.luma4x4[i], 16 );
- }
- if( h->mb.i_cbp_chroma &0x03 ) /* Chroma DC residual present */
- {
- block_residual_write_cabac( h, cb, DCT_CHROMA_DC, 0, h->dct.chroma_dc[0], 4 );
- block_residual_write_cabac( h, cb, DCT_CHROMA_DC, 1, h->dct.chroma_dc[1], 4 );
- }
- if( h->mb.i_cbp_chroma&0x02 ) /* Chroma AC residual present */
- {
- for( i = 16; i < 24; i++ )
- block_residual_write_cabac( h, cb, DCT_CHROMA_AC, i, h->dct.luma4x4[i]+1, 15 );
- }
- }
- #ifndef RDO_SKIP_BS
- h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
- #endif
- }
- #ifdef RDO_SKIP_BS
- /*****************************************************************************
- * RD only; doesn't generate a valid bitstream
- * doesn't write cbp or chroma dc (I don't know how much this matters)
- * works on all partition sizes except 16x16
- * for sub8x8, call once per 8x8 block
- *****************************************************************************/
- static void x264_partition_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_pixel )
- {
- const int i_mb_type = h->mb.i_type;
- int j;
- if( i_mb_type == P_8x8 )
- {
- x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[i8] );
- if( h->mb.pic.i_fref[0] > 1 )
- x264_cabac_mb_ref( h, cb, 0, 4*i8 );
- x264_cabac_mb8x8_mvd( h, cb, 0, i8 );
- }
- else if( i_mb_type == P_L0 )
- {
- if( h->mb.pic.i_fref[0] > 1 )
- x264_cabac_mb_ref( h, cb, 0, 4*i8 );
- if( h->mb.i_partition == D_16x8 )
- x264_cabac_mb_mvd( h, cb, 0, 4*i8, 4, 2 );
- else //8x16
- x264_cabac_mb_mvd( h, cb, 0, 4*i8, 2, 4 );
- }
- else if( i_mb_type == B_8x8 )
- {
- x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[i8] );
- if( h->mb.pic.i_fref[0] > 1
- && x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i8] ] )
- x264_cabac_mb_ref( h, cb, 0, 4*i8 );
- if( h->mb.pic.i_fref[1] > 1
- && x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i8] ] )
- x264_cabac_mb_ref( h, cb, 1, 4*i8 );
- x264_cabac_mb8x8_mvd( h, cb, 0, i8 );
- x264_cabac_mb8x8_mvd( h, cb, 1, i8 );
- }
- else
- {
- x264_log(h, X264_LOG_ERROR, "invalid/unhandled mb_typen" );
- return;
- }
- for( j = (i_pixel < PIXEL_8x8); j >= 0; j-- )
- {
- if( h->mb.i_cbp_luma & (1 << i8) )
- {
- if( h->mb.b_transform_8x8 )
- block_residual_write_cabac( h, cb, DCT_LUMA_8x8, i8, h->dct.luma8x8[i8], 64 );
- else
- {
- int i4;
- for( i4 = 0; i4 < 4; i4++ )
- block_residual_write_cabac( h, cb, DCT_LUMA_4x4, i4+i8*4, h->dct.luma4x4[i4+i8*4], 16 );
- }
- }
- block_residual_write_cabac( h, cb, DCT_CHROMA_AC, 16+i8, h->dct.luma4x4[16+i8]+1, 15 );
- block_residual_write_cabac( h, cb, DCT_CHROMA_AC, 20+i8, h->dct.luma4x4[20+i8]+1, 15 );
- i8 += x264_pixel_size[i_pixel].h >> 3;
- }
- }
- static void x264_partition_i8x8_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_mode )
- {
- const int i_pred = x264_mb_predict_intra4x4_mode( h, 4*i8 );
- const int nnz = array_non_zero(h->dct.luma8x8[i8]);
- i_mode = x264_mb_pred_mode4x4_fix( i_mode );
- x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
- if( nnz )
- {
- block_residual_write_cabac( h, cb, DCT_LUMA_8x8, 4*i8, h->dct.luma8x8[i8], 64 );
- *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[i8*4]] = 0x0101;
- *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[i8*4+2]] = 0x0101;
- }
- else
- {
- *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[i8*4]] = 0;
- *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[i8*4+2]] = 0;
- }
- }
- static void x264_partition_i4x4_size_cabac( x264_t *h, x264_cabac_t *cb, int i4, int i_mode )
- {
- const int i_pred = x264_mb_predict_intra4x4_mode( h, i4 );
- i_mode = x264_mb_pred_mode4x4_fix( i_mode );
- x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
- block_residual_write_cabac( h, cb, DCT_LUMA_4x4, i4, h->dct.luma4x4[i4], 16 );
- h->mb.cache.non_zero_count[x264_scan8[i4]] = array_non_zero( h->dct.luma4x4[i4] );
- }
- static void x264_i8x8_chroma_size_cabac( x264_t *h, x264_cabac_t *cb )
- {
- x264_cabac_mb_intra_chroma_pred_mode( h, cb );
- x264_cabac_mb_cbp_chroma( h, cb );
- if( h->mb.i_cbp_chroma > 0 )
- {
- block_residual_write_cabac( h, cb, DCT_CHROMA_DC, 0, h->dct.chroma_dc[0], 4 );
- block_residual_write_cabac( h, cb, DCT_CHROMA_DC, 1, h->dct.chroma_dc[1], 4 );
- if( h->mb.i_cbp_chroma == 2 )
- {
- int i;
- for( i = 16; i < 24; i++ )
- block_residual_write_cabac( h, cb, DCT_CHROMA_AC, i, h->dct.luma4x4[i]+1, 15 );
- }
- }
- }
- #endif