1 /*****************************************************************************
2 * cabac.c: cabac bitstream writing
3 *****************************************************************************
4 * Copyright (C) 2003-2013 x264 project
6 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7 * Loren Merritt <lorenm@u.washington.edu>
8 * Fiona Glaser <fiona@x264.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
24 * This program is also available under a commercial proprietary license.
25 * For more information, contact us at licensing@x264.com.
26 *****************************************************************************/
28 #include "common/common.h"
29 #include "macroblock.h"
35 static inline void x264_cabac_mb_type_intra( x264_t *h, x264_cabac_t *cb, int i_mb_type,
36 int ctx0, int ctx1, int ctx2, int ctx3, int ctx4, int ctx5 )
38 if( i_mb_type == I_4x4 || i_mb_type == I_8x8 )
40 x264_cabac_encode_decision_noup( cb, ctx0, 0 );
43 else if( i_mb_type == I_PCM )
45 x264_cabac_encode_decision_noup( cb, ctx0, 1 );
46 x264_cabac_encode_flush( h, cb );
51 int i_pred = x264_mb_pred_mode16x16_fix[h->mb.i_intra16x16_pred_mode];
53 x264_cabac_encode_decision_noup( cb, ctx0, 1 );
54 x264_cabac_encode_terminal( cb );
56 x264_cabac_encode_decision_noup( cb, ctx1, !!h->mb.i_cbp_luma );
57 if( h->mb.i_cbp_chroma == 0 )
58 x264_cabac_encode_decision_noup( cb, ctx2, 0 );
61 x264_cabac_encode_decision( cb, ctx2, 1 );
62 x264_cabac_encode_decision_noup( cb, ctx3, h->mb.i_cbp_chroma>>1 );
64 x264_cabac_encode_decision( cb, ctx4, i_pred>>1 );
65 x264_cabac_encode_decision_noup( cb, ctx5, i_pred&1 );
70 static void x264_cabac_field_decoding_flag( x264_t *h, x264_cabac_t *cb )
73 ctx += h->mb.field_decoding_flag & !!h->mb.i_mb_x;
74 ctx += (h->mb.i_mb_top_mbpair_xy >= 0
75 && h->mb.slice_table[h->mb.i_mb_top_mbpair_xy] == h->sh.i_first_mb
76 && h->mb.field[h->mb.i_mb_top_mbpair_xy]);
78 x264_cabac_encode_decision_noup( cb, 70 + ctx, MB_INTERLACED );
79 h->mb.field_decoding_flag = MB_INTERLACED;
83 static void x264_cabac_intra4x4_pred_mode( x264_cabac_t *cb, int i_pred, int i_mode )
85 if( i_pred == i_mode )
86 x264_cabac_encode_decision( cb, 68, 1 );
89 x264_cabac_encode_decision( cb, 68, 0 );
92 x264_cabac_encode_decision( cb, 69, (i_mode )&0x01 );
93 x264_cabac_encode_decision( cb, 69, (i_mode >> 1)&0x01 );
94 x264_cabac_encode_decision( cb, 69, (i_mode >> 2) );
98 static void x264_cabac_intra_chroma_pred_mode( x264_t *h, x264_cabac_t *cb )
100 int i_mode = x264_mb_chroma_pred_mode_fix[h->mb.i_chroma_pred_mode];
103 /* No need to test for I4x4 or I_16x16 as cache_save handle that */
104 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.chroma_pred_mode[h->mb.i_mb_left_xy[0]] != 0 )
106 if( (h->mb.i_neighbour & MB_TOP) && h->mb.chroma_pred_mode[h->mb.i_mb_top_xy] != 0 )
109 x264_cabac_encode_decision_noup( cb, 64 + ctx, i_mode > 0 );
112 x264_cabac_encode_decision( cb, 64 + 3, i_mode > 1 );
114 x264_cabac_encode_decision_noup( cb, 64 + 3, i_mode > 2 );
118 static void x264_cabac_cbp_luma( x264_t *h, x264_cabac_t *cb )
120 int cbp = h->mb.i_cbp_luma;
121 int cbp_l = h->mb.cache.i_cbp_left;
122 int cbp_t = h->mb.cache.i_cbp_top;
123 x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 1) & 1) - ((cbp_t >> 1) & 2), (cbp >> 0) & 1 );
124 x264_cabac_encode_decision ( cb, 76 - ((cbp >> 0) & 1) - ((cbp_t >> 2) & 2), (cbp >> 1) & 1 );
125 x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 3) & 1) - ((cbp << 1) & 2), (cbp >> 2) & 1 );
126 x264_cabac_encode_decision_noup( cb, 76 - ((cbp >> 2) & 1) - ((cbp >> 0) & 2), (cbp >> 3) & 1 );
129 static void x264_cabac_cbp_chroma( x264_t *h, x264_cabac_t *cb )
131 int cbp_a = h->mb.cache.i_cbp_left & 0x30;
132 int cbp_b = h->mb.cache.i_cbp_top & 0x30;
135 if( cbp_a && h->mb.cache.i_cbp_left != -1 ) ctx++;
136 if( cbp_b && h->mb.cache.i_cbp_top != -1 ) ctx+=2;
137 if( h->mb.i_cbp_chroma == 0 )
138 x264_cabac_encode_decision_noup( cb, 77 + ctx, 0 );
141 x264_cabac_encode_decision_noup( cb, 77 + ctx, 1 );
144 if( cbp_a == 0x20 ) ctx++;
145 if( cbp_b == 0x20 ) ctx += 2;
146 x264_cabac_encode_decision_noup( cb, 77 + ctx, h->mb.i_cbp_chroma >> 1 );
150 static void x264_cabac_qp_delta( x264_t *h, x264_cabac_t *cb )
152 int i_dqp = h->mb.i_qp - h->mb.i_last_qp;
155 /* Avoid writing a delta quant if we have an empty i16x16 block, e.g. in a completely flat background area */
156 if( h->mb.i_type == I_16x16 && !h->mb.cbp[h->mb.i_mb_xy] )
159 h->mb.i_qp = h->mb.i_last_qp;
164 /* Since, per the above, empty-CBP I16x16 blocks never have delta quants,
165 * we don't have to check for them. */
166 ctx = h->mb.i_last_dqp && h->mb.cbp[h->mb.i_mb_prev_xy];
170 /* Faster than (i_dqp <= 0 ? (-2*i_dqp) : (2*i_dqp-1)).
171 * If you so much as sneeze on these lines, gcc will compile this suboptimally. */
174 if( val < 0 ) val = i_dqp;
176 /* dqp is interpreted modulo (QP_MAX_SPEC+1) */
177 if( val >= QP_MAX_SPEC && val != QP_MAX_SPEC+1 )
178 val = 2*QP_MAX_SPEC+1 - val;
181 x264_cabac_encode_decision( cb, 60 + ctx, 1 );
185 x264_cabac_encode_decision_noup( cb, 60 + ctx, 0 );
189 void x264_cabac_mb_skip( x264_t *h, int b_skip )
191 int ctx = h->mb.cache.i_neighbour_skip + 11;
192 if( h->sh.i_type != SLICE_TYPE_P )
194 x264_cabac_encode_decision( &h->cabac, ctx, b_skip );
198 static inline void x264_cabac_subpartition_p( x264_cabac_t *cb, int i_sub )
200 if( i_sub == D_L0_8x8 )
202 x264_cabac_encode_decision( cb, 21, 1 );
205 x264_cabac_encode_decision( cb, 21, 0 );
206 if( i_sub == D_L0_8x4 )
207 x264_cabac_encode_decision( cb, 22, 0 );
210 x264_cabac_encode_decision( cb, 22, 1 );
211 x264_cabac_encode_decision( cb, 23, i_sub == D_L0_4x8 );
215 static ALWAYS_INLINE void x264_cabac_subpartition_b( x264_cabac_t *cb, int i_sub )
217 if( i_sub == D_DIRECT_8x8 )
219 x264_cabac_encode_decision( cb, 36, 0 );
222 x264_cabac_encode_decision( cb, 36, 1 );
223 if( i_sub == D_BI_8x8 )
225 x264_cabac_encode_decision( cb, 37, 1 );
226 x264_cabac_encode_decision( cb, 38, 0 );
227 x264_cabac_encode_decision( cb, 39, 0 );
228 x264_cabac_encode_decision( cb, 39, 0 );
231 x264_cabac_encode_decision( cb, 37, 0 );
232 x264_cabac_encode_decision( cb, 39, i_sub == D_L1_8x8 );
235 static ALWAYS_INLINE void x264_cabac_transform_size( x264_t *h, x264_cabac_t *cb )
237 int ctx = 399 + h->mb.cache.i_neighbour_transform_size;
238 x264_cabac_encode_decision_noup( cb, ctx, h->mb.b_transform_8x8 );
241 static ALWAYS_INLINE void x264_cabac_ref_internal( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int bframe )
243 const int i8 = x264_scan8[idx];
244 const int i_refa = h->mb.cache.ref[i_list][i8 - 1];
245 const int i_refb = h->mb.cache.ref[i_list][i8 - 8];
248 if( i_refa > 0 && (!bframe || !h->mb.cache.skip[i8 - 1]) )
250 if( i_refb > 0 && (!bframe || !h->mb.cache.skip[i8 - 8]) )
253 for( int i_ref = h->mb.cache.ref[i_list][i8]; i_ref > 0; i_ref-- )
255 x264_cabac_encode_decision( cb, 54 + ctx, 1 );
258 x264_cabac_encode_decision( cb, 54 + ctx, 0 );
261 static NOINLINE void x264_cabac_ref_p( x264_t *h, x264_cabac_t *cb, int idx )
263 x264_cabac_ref_internal( h, cb, 0, idx, 0 );
265 static NOINLINE void x264_cabac_ref_b( x264_t *h, x264_cabac_t *cb, int i_list, int idx )
267 x264_cabac_ref_internal( h, cb, i_list, idx, 1 );
270 static ALWAYS_INLINE int x264_cabac_mvd_cpn( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int l, int mvd, int ctx )
272 int ctxbase = l ? 47 : 40;
276 x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
280 int i_abs = abs( mvd );
281 x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
285 for( int i = 1; i < i_abs; i++ )
286 x264_cabac_encode_decision( cb, ctxbase + i + 2, 1 );
287 x264_cabac_encode_decision( cb, ctxbase + i_abs + 2, 0 );
288 x264_cabac_encode_bypass( cb, mvd >> 31 );
292 x264_cabac_encode_decision( cb, ctxbase + 3, 1 );
293 x264_cabac_encode_decision( cb, ctxbase + 4, 1 );
294 x264_cabac_encode_decision( cb, ctxbase + 5, 1 );
297 cb->f8_bits_encoded += x264_cabac_size_unary[i_abs - 3][cb->state[ctxbase+6]];
298 cb->state[ctxbase+6] = x264_cabac_transition_unary[i_abs - 3][cb->state[ctxbase+6]];
302 cb->f8_bits_encoded += cabac_size_5ones[cb->state[ctxbase+6]];
303 cb->state[ctxbase+6] = cabac_transition_5ones[cb->state[ctxbase+6]];
304 x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
308 static const uint8_t ctxes[8] = { 3,4,5,6,6,6,6,6 };
312 for( int i = 1; i < i_abs; i++ )
313 x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
314 x264_cabac_encode_decision( cb, ctxbase + ctxes[i_abs-1], 0 );
318 for( int i = 1; i < 9; i++ )
319 x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
320 x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
322 x264_cabac_encode_bypass( cb, mvd >> 31 );
324 /* Since we don't need to keep track of MVDs larger than 66, just cap the value.
325 * This lets us store MVDs as 8-bit values instead of 16-bit. */
326 return X264_MIN( i_abs, 66 );
329 static NOINLINE uint16_t x264_cabac_mvd( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int width )
331 ALIGNED_4( int16_t mvp[2] );
335 x264_mb_predict_mv( h, i_list, idx, width, mvp );
336 mdx = h->mb.cache.mv[i_list][x264_scan8[idx]][0] - mvp[0];
337 mdy = h->mb.cache.mv[i_list][x264_scan8[idx]][1] - mvp[1];
338 uint16_t amvd = x264_cabac_mvd_sum(h->mb.cache.mvd[i_list][x264_scan8[idx] - 1],
339 h->mb.cache.mvd[i_list][x264_scan8[idx] - 8]);
342 mdx = x264_cabac_mvd_cpn( h, cb, i_list, idx, 0, mdx, amvd&0xFF );
343 mdy = x264_cabac_mvd_cpn( h, cb, i_list, idx, 1, mdy, amvd>>8 );
345 return pack8to16(mdx,mdy);
348 #define x264_cabac_mvd(h,cb,i_list,idx,width,height)\
351 uint16_t mvd = x264_cabac_mvd(h,cb,i_list,idx,width);\
352 x264_macroblock_cache_mvd( h, block_idx_x[idx], block_idx_y[idx], width, height, i_list, mvd );\
355 static inline void x264_cabac_8x8_mvd( x264_t *h, x264_cabac_t *cb, int i )
357 switch( h->mb.i_sub_partition[i] )
360 x264_cabac_mvd( h, cb, 0, 4*i, 2, 2 );
363 x264_cabac_mvd( h, cb, 0, 4*i+0, 2, 1 );
364 x264_cabac_mvd( h, cb, 0, 4*i+2, 2, 1 );
367 x264_cabac_mvd( h, cb, 0, 4*i+0, 1, 2 );
368 x264_cabac_mvd( h, cb, 0, 4*i+1, 1, 2 );
371 x264_cabac_mvd( h, cb, 0, 4*i+0, 1, 1 );
372 x264_cabac_mvd( h, cb, 0, 4*i+1, 1, 1 );
373 x264_cabac_mvd( h, cb, 0, 4*i+2, 1, 1 );
374 x264_cabac_mvd( h, cb, 0, 4*i+3, 1, 1 );
381 static ALWAYS_INLINE void x264_cabac_mb_header_i( x264_t *h, x264_cabac_t *cb, int i_mb_type, int slice_type, int chroma )
383 if( slice_type == SLICE_TYPE_I )
386 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.i_mb_type_left[0] != I_4x4 )
388 if( (h->mb.i_neighbour & MB_TOP) && h->mb.i_mb_type_top != I_4x4 )
391 x264_cabac_mb_type_intra( h, cb, i_mb_type, 3+ctx, 3+3, 3+4, 3+5, 3+6, 3+7 );
393 else if( slice_type == SLICE_TYPE_P )
396 x264_cabac_encode_decision_noup( cb, 14, 1 );
399 x264_cabac_mb_type_intra( h, cb, i_mb_type, 17+0, 17+1, 17+2, 17+2, 17+3, 17+3 );
401 else if( slice_type == SLICE_TYPE_B )
404 x264_cabac_encode_decision_noup( cb, 27+3, 1 );
405 x264_cabac_encode_decision_noup( cb, 27+4, 1 );
406 x264_cabac_encode_decision( cb, 27+5, 1 );
407 x264_cabac_encode_decision( cb, 27+5, 0 );
408 x264_cabac_encode_decision( cb, 27+5, 1 );
411 x264_cabac_mb_type_intra( h, cb, i_mb_type, 32+0, 32+1, 32+2, 32+2, 32+3, 32+3 );
414 if( i_mb_type == I_PCM )
417 if( i_mb_type != I_16x16 )
419 if( h->pps->b_transform_8x8_mode )
420 x264_cabac_transform_size( h, cb );
422 int di = h->mb.b_transform_8x8 ? 4 : 1;
423 for( int i = 0; i < 16; i += di )
425 const int i_pred = x264_mb_predict_intra4x4_mode( h, i );
426 const int i_mode = x264_mb_pred_mode4x4_fix( h->mb.cache.intra4x4_pred_mode[x264_scan8[i]] );
427 x264_cabac_intra4x4_pred_mode( cb, i_pred, i_mode );
432 x264_cabac_intra_chroma_pred_mode( h, cb );
435 static ALWAYS_INLINE void x264_cabac_mb_header_p( x264_t *h, x264_cabac_t *cb, int i_mb_type, int chroma )
437 if( i_mb_type == P_L0 )
439 x264_cabac_encode_decision_noup( cb, 14, 0 );
440 if( h->mb.i_partition == D_16x16 )
442 x264_cabac_encode_decision_noup( cb, 15, 0 );
443 x264_cabac_encode_decision_noup( cb, 16, 0 );
444 if( h->mb.pic.i_fref[0] > 1 )
445 x264_cabac_ref_p( h, cb, 0 );
446 x264_cabac_mvd( h, cb, 0, 0, 4, 4 );
448 else if( h->mb.i_partition == D_16x8 )
450 x264_cabac_encode_decision_noup( cb, 15, 1 );
451 x264_cabac_encode_decision_noup( cb, 17, 1 );
452 if( h->mb.pic.i_fref[0] > 1 )
454 x264_cabac_ref_p( h, cb, 0 );
455 x264_cabac_ref_p( h, cb, 8 );
457 x264_cabac_mvd( h, cb, 0, 0, 4, 2 );
458 x264_cabac_mvd( h, cb, 0, 8, 4, 2 );
460 else //if( h->mb.i_partition == D_8x16 )
462 x264_cabac_encode_decision_noup( cb, 15, 1 );
463 x264_cabac_encode_decision_noup( cb, 17, 0 );
464 if( h->mb.pic.i_fref[0] > 1 )
466 x264_cabac_ref_p( h, cb, 0 );
467 x264_cabac_ref_p( h, cb, 4 );
469 x264_cabac_mvd( h, cb, 0, 0, 2, 4 );
470 x264_cabac_mvd( h, cb, 0, 4, 2, 4 );
473 else if( i_mb_type == P_8x8 )
475 x264_cabac_encode_decision_noup( cb, 14, 0 );
476 x264_cabac_encode_decision_noup( cb, 15, 0 );
477 x264_cabac_encode_decision_noup( cb, 16, 1 );
480 for( int i = 0; i < 4; i++ )
481 x264_cabac_subpartition_p( cb, h->mb.i_sub_partition[i] );
484 if( h->mb.pic.i_fref[0] > 1 )
486 x264_cabac_ref_p( h, cb, 0 );
487 x264_cabac_ref_p( h, cb, 4 );
488 x264_cabac_ref_p( h, cb, 8 );
489 x264_cabac_ref_p( h, cb, 12 );
492 for( int i = 0; i < 4; i++ )
493 x264_cabac_8x8_mvd( h, cb, i );
496 x264_cabac_mb_header_i( h, cb, i_mb_type, SLICE_TYPE_P, chroma );
499 static ALWAYS_INLINE void x264_cabac_mb_header_b( x264_t *h, x264_cabac_t *cb, int i_mb_type, int chroma )
502 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.i_mb_type_left[0] != B_SKIP && h->mb.i_mb_type_left[0] != B_DIRECT )
504 if( (h->mb.i_neighbour & MB_TOP) && h->mb.i_mb_type_top != B_SKIP && h->mb.i_mb_type_top != B_DIRECT )
507 if( i_mb_type == B_DIRECT )
509 x264_cabac_encode_decision_noup( cb, 27+ctx, 0 );
512 x264_cabac_encode_decision_noup( cb, 27+ctx, 1 );
514 if( i_mb_type == B_8x8 )
516 x264_cabac_encode_decision_noup( cb, 27+3, 1 );
517 x264_cabac_encode_decision_noup( cb, 27+4, 1 );
518 x264_cabac_encode_decision( cb, 27+5, 1 );
519 x264_cabac_encode_decision( cb, 27+5, 1 );
520 x264_cabac_encode_decision_noup( cb, 27+5, 1 );
523 for( int i = 0; i < 4; i++ )
524 x264_cabac_subpartition_b( cb, h->mb.i_sub_partition[i] );
527 if( h->mb.pic.i_fref[0] > 1 )
528 for( int i = 0; i < 4; i++ )
529 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i] ] )
530 x264_cabac_ref_b( h, cb, 0, 4*i );
532 if( h->mb.pic.i_fref[1] > 1 )
533 for( int i = 0; i < 4; i++ )
534 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i] ] )
535 x264_cabac_ref_b( h, cb, 1, 4*i );
537 for( int i = 0; i < 4; i++ )
538 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i] ] )
539 x264_cabac_mvd( h, cb, 0, 4*i, 2, 2 );
541 for( int i = 0; i < 4; i++ )
542 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i] ] )
543 x264_cabac_mvd( h, cb, 1, 4*i, 2, 2 );
545 else if( i_mb_type >= B_L0_L0 && i_mb_type <= B_BI_BI )
548 static const uint8_t i_mb_bits[9*3] =
550 0x31, 0x29, 0x4, /* L0 L0 */
551 0x35, 0x2d, 0, /* L0 L1 */
552 0x43, 0x63, 0, /* L0 BI */
553 0x3d, 0x2f, 0, /* L1 L0 */
554 0x39, 0x25, 0x6, /* L1 L1 */
555 0x53, 0x73, 0, /* L1 BI */
556 0x4b, 0x6b, 0, /* BI L0 */
557 0x5b, 0x7b, 0, /* BI L1 */
558 0x47, 0x67, 0x21 /* BI BI */
561 const int idx = (i_mb_type - B_L0_L0) * 3 + (h->mb.i_partition - D_16x8);
562 int bits = i_mb_bits[idx];
564 x264_cabac_encode_decision_noup( cb, 27+3, bits&1 );
565 x264_cabac_encode_decision( cb, 27+5-(bits&1), (bits>>1)&1 ); bits >>= 2;
568 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
569 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
570 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
572 x264_cabac_encode_decision_noup( cb, 27+5, bits&1 );
575 const uint8_t (*b_list)[2] = x264_mb_type_list_table[i_mb_type];
576 if( h->mb.pic.i_fref[0] > 1 )
579 x264_cabac_ref_b( h, cb, 0, 0 );
580 if( b_list[0][1] && h->mb.i_partition != D_16x16 )
581 x264_cabac_ref_b( h, cb, 0, 8 >> (h->mb.i_partition == D_8x16) );
583 if( h->mb.pic.i_fref[1] > 1 )
586 x264_cabac_ref_b( h, cb, 1, 0 );
587 if( b_list[1][1] && h->mb.i_partition != D_16x16 )
588 x264_cabac_ref_b( h, cb, 1, 8 >> (h->mb.i_partition == D_8x16) );
590 for( int i_list = 0; i_list < 2; i_list++ )
592 if( h->mb.i_partition == D_16x16 )
594 if( b_list[i_list][0] ) x264_cabac_mvd( h, cb, i_list, 0, 4, 4 );
596 else if( h->mb.i_partition == D_16x8 )
598 if( b_list[i_list][0] ) x264_cabac_mvd( h, cb, i_list, 0, 4, 2 );
599 if( b_list[i_list][1] ) x264_cabac_mvd( h, cb, i_list, 8, 4, 2 );
601 else //if( h->mb.i_partition == D_8x16 )
603 if( b_list[i_list][0] ) x264_cabac_mvd( h, cb, i_list, 0, 2, 4 );
604 if( b_list[i_list][1] ) x264_cabac_mvd( h, cb, i_list, 4, 2, 4 );
609 x264_cabac_mb_header_i( h, cb, i_mb_type, SLICE_TYPE_B, chroma );
612 static int ALWAYS_INLINE x264_cabac_cbf_ctxidxinc( x264_t *h, int i_cat, int i_idx, int b_intra, int b_dc )
614 static const uint16_t base_ctx[14] = {85,89,93,97,101,1012,460,464,468,1016,472,476,480,1020};
619 if( i_cat == DCT_CHROMA_DC )
621 int i_nza = h->mb.cache.i_cbp_left != -1 ? (h->mb.cache.i_cbp_left >> (8 + i_idx)) & 1 : b_intra;
622 int i_nzb = h->mb.cache.i_cbp_top != -1 ? (h->mb.cache.i_cbp_top >> (8 + i_idx)) & 1 : b_intra;
623 return base_ctx[i_cat] + 2*i_nzb + i_nza;
627 int i_nza = (h->mb.cache.i_cbp_left >> (8 + i_idx)) & 1;
628 int i_nzb = (h->mb.cache.i_cbp_top >> (8 + i_idx)) & 1;
629 return base_ctx[i_cat] + 2*i_nzb + i_nza;
634 int i_nza = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 1];
635 int i_nzb = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 8];
636 if( x264_constant_p(b_intra) && !b_intra )
637 return base_ctx[i_cat] + ((2*i_nzb + i_nza)&0x7f);
640 i_nza &= 0x7f + (b_intra << 7);
641 i_nzb &= 0x7f + (b_intra << 7);
642 return base_ctx[i_cat] + 2*!!i_nzb + !!i_nza;
647 static const uint16_t significant_coeff_flag_offset[2][14] =
649 { 105+0, 105+15, 105+29, 105+44, 105+47, 402, 484+0, 484+15, 484+29, 660, 528+0, 528+15, 528+29, 718 },
650 { 277+0, 277+15, 277+29, 277+44, 277+47, 436, 776+0, 776+15, 776+29, 675, 820+0, 820+15, 820+29, 733 }
652 static const uint16_t last_coeff_flag_offset[2][14] =
654 { 166+0, 166+15, 166+29, 166+44, 166+47, 417, 572+0, 572+15, 572+29, 690, 616+0, 616+15, 616+29, 748 },
655 { 338+0, 338+15, 338+29, 338+44, 338+47, 451, 864+0, 864+15, 864+29, 699, 908+0, 908+15, 908+29, 757 }
657 static const uint16_t coeff_abs_level_m1_offset[14] =
659 227+0, 227+10, 227+20, 227+30, 227+39, 426, 952+0, 952+10, 952+20, 708, 982+0, 982+10, 982+20, 766
662 extern const uint8_t x264_significant_coeff_flag_offset_8x8[2][63];
663 extern const uint8_t x264_last_coeff_flag_offset_8x8[63];
664 extern const uint8_t x264_coeff_flag_offset_chroma_422_dc[7];
666 const uint8_t x264_significant_coeff_flag_offset_8x8[2][63] =
668 0, 1, 2, 3, 4, 5, 5, 4, 4, 3, 3, 4, 4, 4, 5, 5,
669 4, 4, 4, 4, 3, 3, 6, 7, 7, 7, 8, 9,10, 9, 8, 7,
670 7, 6,11,12,13,11, 6, 7, 8, 9,14,10, 9, 8, 6,11,
671 12,13,11, 6, 9,14,10, 9,11,12,13,11,14,10,12
673 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 7, 7, 8, 4, 5,
674 6, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,11,12,11,
675 9, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,13,13, 9,
676 9,10,10, 8,13,13, 9, 9,10,10,14,14,14,14,14
678 const uint8_t x264_last_coeff_flag_offset_8x8[63] =
680 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
681 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
682 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
683 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
685 const uint8_t x264_coeff_flag_offset_chroma_422_dc[7] = { 0, 0, 1, 1, 2, 2, 2 }; /* MIN( i/2, 2 ) */
688 // node ctx: 0..3: abslevel1 (with abslevelgt1 == 0).
689 // 4..7: abslevelgt1 + 3 (and abslevel1 doesn't matter).
690 /* map node ctx => cabac ctx for level=1 */
691 static const uint8_t coeff_abs_level1_ctx[8] = { 1, 2, 3, 4, 0, 0, 0, 0 };
692 /* map node ctx => cabac ctx for level>1 */
693 static const uint8_t coeff_abs_levelgt1_ctx[8] = { 5, 5, 5, 5, 6, 7, 8, 9 };
694 /* 4:2:2 chroma dc uses a slightly different state machine for some reason, also note that
695 * 4:2:0 chroma dc doesn't use the last state so it has identical output with both arrays. */
696 static const uint8_t coeff_abs_levelgt1_ctx_chroma_dc[8] = { 5, 5, 5, 5, 6, 7, 8, 8 };
697 static const uint8_t coeff_abs_level_transition[2][8] = {
698 /* update node ctx after coding a level=1 */
699 { 1, 2, 3, 3, 4, 5, 6, 7 },
700 /* update node ctx after coding a level>1 */
701 { 4, 4, 4, 4, 5, 6, 7, 7 }
703 static const uint8_t count_cat_m1[14] = {15, 14, 15, 3, 14, 63, 15, 14, 15, 63, 15, 14, 15, 63};
706 static ALWAYS_INLINE void x264_cabac_block_residual_internal( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l, int chroma422dc )
708 int ctx_sig = significant_coeff_flag_offset[MB_INTERLACED][ctx_block_cat];
709 int ctx_last = last_coeff_flag_offset[MB_INTERLACED][ctx_block_cat];
710 int ctx_level = coeff_abs_level_m1_offset[ctx_block_cat];
711 int coeff_idx = -1, node_ctx = 0;
712 int last = h->quantf.coeff_last[ctx_block_cat]( l );
713 const uint8_t *levelgt1_ctx = chroma422dc ? coeff_abs_levelgt1_ctx_chroma_dc : coeff_abs_levelgt1_ctx;
716 #define WRITE_SIGMAP( sig_off, last_off )\
723 coeffs[++coeff_idx] = l[i];\
724 x264_cabac_encode_decision( cb, ctx_sig + sig_off, 1 );\
727 x264_cabac_encode_decision( cb, ctx_last + last_off, 1 );\
731 x264_cabac_encode_decision( cb, ctx_last + last_off, 0 );\
734 x264_cabac_encode_decision( cb, ctx_sig + sig_off, 0 );\
735 if( ++i == count_m1 )\
737 coeffs[++coeff_idx] = l[i];\
746 WRITE_SIGMAP( x264_coeff_flag_offset_chroma_422_dc[i], x264_coeff_flag_offset_chroma_422_dc[i] )
750 int count_m1 = count_cat_m1[ctx_block_cat];
753 const uint8_t *sig_offset = x264_significant_coeff_flag_offset_8x8[MB_INTERLACED];
754 WRITE_SIGMAP( sig_offset[i], x264_last_coeff_flag_offset_8x8[i] )
762 /* write coeff_abs - 1 */
763 int coeff = coeffs[coeff_idx];
764 int abs_coeff = abs(coeff);
765 int coeff_sign = coeff >> 31;
766 int ctx = coeff_abs_level1_ctx[node_ctx] + ctx_level;
770 x264_cabac_encode_decision( cb, ctx, 1 );
771 ctx = levelgt1_ctx[node_ctx] + ctx_level;
772 for( int i = X264_MIN( abs_coeff, 15 ) - 2; i > 0; i-- )
773 x264_cabac_encode_decision( cb, ctx, 1 );
775 x264_cabac_encode_decision( cb, ctx, 0 );
777 x264_cabac_encode_ue_bypass( cb, 0, abs_coeff - 15 );
779 node_ctx = coeff_abs_level_transition[1][node_ctx];
783 x264_cabac_encode_decision( cb, ctx, 0 );
784 node_ctx = coeff_abs_level_transition[0][node_ctx];
787 x264_cabac_encode_bypass( cb, coeff_sign );
788 } while( --coeff_idx >= 0 );
790 static void x264_cabac_block_residual( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l )
792 x264_cabac_block_residual_internal( h, cb, ctx_block_cat, l, 0 );
794 static void x264_cabac_block_residual_422_dc( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l )
796 /* Template a version specifically for chroma 4:2:2 DC in order to avoid
797 * slowing down everything else due to the added complexity. */
798 x264_cabac_block_residual_internal( h, cb, DCT_CHROMA_DC, l, 1 );
800 #define x264_cabac_block_residual_8x8( h, cb, cat, l ) x264_cabac_block_residual( h, cb, cat, l )
803 /* Faster RDO by merging sigmap and level coding. Note that for 8x8dct and chroma 4:2:2 dc this is
804 * slightly incorrect because the sigmap is not reversible (contexts are repeated). However, there
805 * is nearly no quality penalty for this (~0.001db) and the speed boost (~30%) is worth it. */
806 static void ALWAYS_INLINE x264_cabac_block_residual_internal( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l, int b_8x8, int chroma422dc )
808 const uint8_t *sig_offset = x264_significant_coeff_flag_offset_8x8[MB_INTERLACED];
809 int ctx_sig = significant_coeff_flag_offset[MB_INTERLACED][ctx_block_cat];
810 int ctx_last = last_coeff_flag_offset[MB_INTERLACED][ctx_block_cat];
811 int ctx_level = coeff_abs_level_m1_offset[ctx_block_cat];
812 int last = h->quantf.coeff_last[ctx_block_cat]( l );
813 int coeff_abs = abs(l[last]);
814 int ctx = coeff_abs_level1_ctx[0] + ctx_level;
816 const uint8_t *levelgt1_ctx = chroma422dc ? coeff_abs_levelgt1_ctx_chroma_dc : coeff_abs_levelgt1_ctx;
818 if( last != (b_8x8 ? 63 : chroma422dc ? 7 : count_cat_m1[ctx_block_cat]) )
820 x264_cabac_encode_decision( cb, ctx_sig + (b_8x8 ? sig_offset[last] :
821 chroma422dc ? x264_coeff_flag_offset_chroma_422_dc[last] : last), 1 );
822 x264_cabac_encode_decision( cb, ctx_last + (b_8x8 ? x264_last_coeff_flag_offset_8x8[last] :
823 chroma422dc ? x264_coeff_flag_offset_chroma_422_dc[last] : last), 1 );
828 x264_cabac_encode_decision( cb, ctx, 1 );
829 ctx = levelgt1_ctx[0] + ctx_level;
832 cb->f8_bits_encoded += x264_cabac_size_unary[coeff_abs-1][cb->state[ctx]];
833 cb->state[ctx] = x264_cabac_transition_unary[coeff_abs-1][cb->state[ctx]];
837 cb->f8_bits_encoded += x264_cabac_size_unary[14][cb->state[ctx]];
838 cb->state[ctx] = x264_cabac_transition_unary[14][cb->state[ctx]];
839 x264_cabac_encode_ue_bypass( cb, 0, coeff_abs - 15 );
841 node_ctx = coeff_abs_level_transition[1][0];
845 x264_cabac_encode_decision( cb, ctx, 0 );
846 node_ctx = coeff_abs_level_transition[0][0];
847 x264_cabac_encode_bypass( cb, 0 ); // sign
850 for( int i = last-1 ; i >= 0; i-- )
854 coeff_abs = abs(l[i]);
855 x264_cabac_encode_decision( cb, ctx_sig + (b_8x8 ? sig_offset[i] :
856 chroma422dc ? x264_coeff_flag_offset_chroma_422_dc[i] : i), 1 );
857 x264_cabac_encode_decision( cb, ctx_last + (b_8x8 ? x264_last_coeff_flag_offset_8x8[i] :
858 chroma422dc ? x264_coeff_flag_offset_chroma_422_dc[i] : i), 0 );
859 ctx = coeff_abs_level1_ctx[node_ctx] + ctx_level;
863 x264_cabac_encode_decision( cb, ctx, 1 );
864 ctx = levelgt1_ctx[node_ctx] + ctx_level;
867 cb->f8_bits_encoded += x264_cabac_size_unary[coeff_abs-1][cb->state[ctx]];
868 cb->state[ctx] = x264_cabac_transition_unary[coeff_abs-1][cb->state[ctx]];
872 cb->f8_bits_encoded += x264_cabac_size_unary[14][cb->state[ctx]];
873 cb->state[ctx] = x264_cabac_transition_unary[14][cb->state[ctx]];
874 x264_cabac_encode_ue_bypass( cb, 0, coeff_abs - 15 );
876 node_ctx = coeff_abs_level_transition[1][node_ctx];
880 x264_cabac_encode_decision( cb, ctx, 0 );
881 node_ctx = coeff_abs_level_transition[0][node_ctx];
882 x264_cabac_encode_bypass( cb, 0 );
886 x264_cabac_encode_decision( cb, ctx_sig + (b_8x8 ? sig_offset[i] :
887 chroma422dc ? x264_coeff_flag_offset_chroma_422_dc[i] : i), 0 );
891 static void x264_cabac_block_residual_8x8( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l )
893 x264_cabac_block_residual_internal( h, cb, ctx_block_cat, l, 1, 0 );
895 static void x264_cabac_block_residual_422_dc( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l )
897 x264_cabac_block_residual_internal( h, cb, DCT_CHROMA_DC, l, 0, 1 );
899 static void x264_cabac_block_residual( x264_t *h, x264_cabac_t *cb, int ctx_block_cat, dctcoef *l )
901 x264_cabac_block_residual_internal( h, cb, ctx_block_cat, l, 0, 0 );
905 #define x264_cabac_block_residual_cbf_internal( h, cb, ctx_block_cat, i_idx, l, b_intra, b_dc, name )\
908 int ctxidxinc = x264_cabac_cbf_ctxidxinc( h, ctx_block_cat, i_idx, b_intra, b_dc );\
909 if( h->mb.cache.non_zero_count[x264_scan8[i_idx]] )\
911 x264_cabac_encode_decision( cb, ctxidxinc, 1 );\
912 x264_cabac_block_residual##name( h, cb, ctx_block_cat, l );\
915 x264_cabac_encode_decision( cb, ctxidxinc, 0 );\
918 #define x264_cabac_block_residual_dc_cbf( h, cb, ctx_block_cat, i_idx, l, b_intra )\
919 x264_cabac_block_residual_cbf_internal( h, cb, ctx_block_cat, i_idx, l, b_intra, 1, )
921 #define x264_cabac_block_residual_cbf( h, cb, ctx_block_cat, i_idx, l, b_intra )\
922 x264_cabac_block_residual_cbf_internal( h, cb, ctx_block_cat, i_idx, l, b_intra, 0, )
924 #define x264_cabac_block_residual_8x8_cbf( h, cb, ctx_block_cat, i_idx, l, b_intra )\
925 x264_cabac_block_residual_cbf_internal( h, cb, ctx_block_cat, i_idx, l, b_intra, 0, _8x8 )
927 #define x264_cabac_block_residual_422_dc_cbf( h, cb, ch, b_intra )\
928 x264_cabac_block_residual_cbf_internal( h, cb, DCT_CHROMA_DC, CHROMA_DC+(ch), h->dct.chroma_dc[ch], b_intra, 1, _422_dc )
930 static ALWAYS_INLINE void x264_macroblock_write_cabac_internal( x264_t *h, x264_cabac_t *cb, int plane_count, int chroma )
932 const int i_mb_type = h->mb.i_type;
935 const int i_mb_pos_start = x264_cabac_pos( cb );
939 (!(h->mb.i_mb_y & 1) || IS_SKIP(h->mb.type[h->mb.i_mb_xy - h->mb.i_mb_stride])) )
941 x264_cabac_field_decoding_flag( h, cb );
945 if( h->sh.i_type == SLICE_TYPE_P )
946 x264_cabac_mb_header_p( h, cb, i_mb_type, chroma );
947 else if( h->sh.i_type == SLICE_TYPE_B )
948 x264_cabac_mb_header_b( h, cb, i_mb_type, chroma );
949 else //if( h->sh.i_type == SLICE_TYPE_I )
950 x264_cabac_mb_header_i( h, cb, i_mb_type, SLICE_TYPE_I, chroma );
953 i_mb_pos_tex = x264_cabac_pos( cb );
954 h->stat.frame.i_mv_bits += i_mb_pos_tex - i_mb_pos_start;
956 if( i_mb_type == I_PCM )
959 bs_init( &s, cb->p, cb->p_end - cb->p );
961 for( int p = 0; p < plane_count; p++ )
962 for( int i = 0; i < 256; i++ )
963 bs_write( &s, BIT_DEPTH, h->mb.pic.p_fenc[p][i] );
965 for( int ch = 1; ch < 3; ch++ )
966 for( int i = 0; i < 16>>CHROMA_V_SHIFT; i++ )
967 for( int j = 0; j < 8; j++ )
968 bs_write( &s, BIT_DEPTH, h->mb.pic.p_fenc[ch][i*FENC_STRIDE+j] );
972 x264_cabac_encode_init_core( cb );
974 h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
979 if( i_mb_type != I_16x16 )
981 x264_cabac_cbp_luma( h, cb );
983 x264_cabac_cbp_chroma( h, cb );
986 if( x264_mb_transform_8x8_allowed( h ) && h->mb.i_cbp_luma )
988 x264_cabac_transform_size( h, cb );
991 if( h->mb.i_cbp_luma || (chroma && h->mb.i_cbp_chroma) || i_mb_type == I_16x16 )
993 const int b_intra = IS_INTRA( i_mb_type );
994 x264_cabac_qp_delta( h, cb );
997 if( i_mb_type == I_16x16 )
1000 for( int p = 0; p < plane_count; p++ )
1002 x264_cabac_block_residual_dc_cbf( h, cb, ctx_cat_plane[DCT_LUMA_DC][p], LUMA_DC+p, h->dct.luma16x16_dc[p], 1 );
1005 if( h->mb.i_cbp_luma )
1006 for( int i = p*16; i < p*16+16; i++ )
1007 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_AC][p], i, h->dct.luma4x4[i]+1, 1 );
1010 else if( h->mb.b_transform_8x8 )
1012 if( plane_count == 3 )
1014 ALIGNED_4( uint8_t nnzbak[3][8] );
1016 /* Stupid nnz munging in the case that neighbors don't have
1017 * 8x8 transform enabled. */
1018 #define BACKUP( dst, src, res )\
1022 #define RESTORE( dst, src, res )\
1025 #define MUNGE_8x8_NNZ( MUNGE )\
1026 if( (h->mb.i_neighbour & MB_LEFT) && !h->mb.mb_transform_size[h->mb.i_mb_left_xy[0]] )\
1028 MUNGE( nnzbak[0][0], h->mb.cache.non_zero_count[x264_scan8[16*0+ 0] - 1], 0x80 )\
1029 MUNGE( nnzbak[0][1], h->mb.cache.non_zero_count[x264_scan8[16*0+ 2] - 1], 0x80 )\
1030 MUNGE( nnzbak[1][0], h->mb.cache.non_zero_count[x264_scan8[16*1+ 0] - 1], 0x80 )\
1031 MUNGE( nnzbak[1][1], h->mb.cache.non_zero_count[x264_scan8[16*1+ 2] - 1], 0x80 )\
1032 MUNGE( nnzbak[2][0], h->mb.cache.non_zero_count[x264_scan8[16*2+ 0] - 1], 0x80 )\
1033 MUNGE( nnzbak[2][1], h->mb.cache.non_zero_count[x264_scan8[16*2+ 2] - 1], 0x80 )\
1035 if( (h->mb.i_neighbour & MB_LEFT) && !h->mb.mb_transform_size[h->mb.i_mb_left_xy[1]] )\
1037 MUNGE( nnzbak[0][2], h->mb.cache.non_zero_count[x264_scan8[16*0+ 8] - 1], 0x80 )\
1038 MUNGE( nnzbak[0][3], h->mb.cache.non_zero_count[x264_scan8[16*0+10] - 1], 0x80 )\
1039 MUNGE( nnzbak[1][2], h->mb.cache.non_zero_count[x264_scan8[16*1+ 8] - 1], 0x80 )\
1040 MUNGE( nnzbak[1][3], h->mb.cache.non_zero_count[x264_scan8[16*1+10] - 1], 0x80 )\
1041 MUNGE( nnzbak[2][2], h->mb.cache.non_zero_count[x264_scan8[16*2+ 8] - 1], 0x80 )\
1042 MUNGE( nnzbak[2][3], h->mb.cache.non_zero_count[x264_scan8[16*2+10] - 1], 0x80 )\
1044 if( (h->mb.i_neighbour & MB_TOP) && !h->mb.mb_transform_size[h->mb.i_mb_top_xy] )\
1046 MUNGE( M32( &nnzbak[0][4] ), M32( &h->mb.cache.non_zero_count[x264_scan8[16*0] - 8] ), 0x80808080U )\
1047 MUNGE( M32( &nnzbak[1][4] ), M32( &h->mb.cache.non_zero_count[x264_scan8[16*1] - 8] ), 0x80808080U )\
1048 MUNGE( M32( &nnzbak[2][4] ), M32( &h->mb.cache.non_zero_count[x264_scan8[16*2] - 8] ), 0x80808080U )\
1051 MUNGE_8x8_NNZ( BACKUP )
1053 for( int p = 0; p < 3; p++ )
1054 for( int i = 0; i < 4; i++ )
1055 if( h->mb.i_cbp_luma & ( 1 << i ) )
1056 x264_cabac_block_residual_8x8_cbf( h, cb, ctx_cat_plane[DCT_LUMA_8x8][p], i*4+p*16, h->dct.luma8x8[i+p*4], b_intra );
1058 MUNGE_8x8_NNZ( RESTORE )
1062 for( int i = 0; i < 4; i++ )
1063 if( h->mb.i_cbp_luma & ( 1 << i ) )
1064 x264_cabac_block_residual_8x8( h, cb, DCT_LUMA_8x8, h->dct.luma8x8[i] );
1069 for( int p = 0; p < plane_count; p++ )
1070 for( int i = 0; i < 16; i++ )
1071 if( h->mb.i_cbp_luma & ( 1 << ( i >> 2 ) ) )
1072 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_4x4][p], i+p*16, h->dct.luma4x4[i+p*16], b_intra );
1075 if( chroma && h->mb.i_cbp_chroma ) /* Chroma DC residual present */
1077 if( CHROMA_FORMAT == CHROMA_422 )
1079 x264_cabac_block_residual_422_dc_cbf( h, cb, 0, b_intra );
1080 x264_cabac_block_residual_422_dc_cbf( h, cb, 1, b_intra );
1084 x264_cabac_block_residual_dc_cbf( h, cb, DCT_CHROMA_DC, CHROMA_DC+0, h->dct.chroma_dc[0], b_intra );
1085 x264_cabac_block_residual_dc_cbf( h, cb, DCT_CHROMA_DC, CHROMA_DC+1, h->dct.chroma_dc[1], b_intra );
1088 if( h->mb.i_cbp_chroma == 2 ) /* Chroma AC residual present */
1090 int step = 8 << CHROMA_V_SHIFT;
1091 for( int i = 16; i < 3*16; i += step )
1092 for( int j = i; j < i+4; j++ )
1093 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, j, h->dct.luma4x4[j]+1, b_intra );
1099 h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
1103 void x264_macroblock_write_cabac( x264_t *h, x264_cabac_t *cb )
1106 x264_macroblock_write_cabac_internal( h, cb, 3, 0 );
1108 x264_macroblock_write_cabac_internal( h, cb, 1, 1 );
1112 /*****************************************************************************
1113 * RD only; doesn't generate a valid bitstream
1114 * doesn't write cbp or chroma dc (I don't know how much this matters)
1115 * doesn't write ref (never varies between calls, so no point in doing so)
1116 * only writes subpartition for p8x8, needed for sub-8x8 mode decision RDO
1117 * works on all partition sizes except 16x16
1118 *****************************************************************************/
1119 static void x264_partition_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_pixel )
1121 const int i_mb_type = h->mb.i_type;
1122 int b_8x16 = h->mb.i_partition == D_8x16;
1123 int plane_count = CHROMA444 ? 3 : 1;
1125 if( i_mb_type == P_8x8 )
1127 x264_cabac_8x8_mvd( h, cb, i8 );
1128 x264_cabac_subpartition_p( cb, h->mb.i_sub_partition[i8] );
1130 else if( i_mb_type == P_L0 )
1131 x264_cabac_mvd( h, cb, 0, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1132 else if( i_mb_type > B_DIRECT && i_mb_type < B_8x8 )
1134 if( x264_mb_type_list_table[ i_mb_type ][0][!!i8] ) x264_cabac_mvd( h, cb, 0, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1135 if( x264_mb_type_list_table[ i_mb_type ][1][!!i8] ) x264_cabac_mvd( h, cb, 1, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1137 else //if( i_mb_type == B_8x8 )
1139 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i8] ] )
1140 x264_cabac_mvd( h, cb, 0, 4*i8, 2, 2 );
1141 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i8] ] )
1142 x264_cabac_mvd( h, cb, 1, 4*i8, 2, 2 );
1145 for( int j = (i_pixel < PIXEL_8x8); j >= 0; j-- )
1147 if( h->mb.i_cbp_luma & (1 << i8) )
1149 if( h->mb.b_transform_8x8 )
1152 for( int p = 0; p < 3; p++ )
1153 x264_cabac_block_residual_8x8_cbf( h, cb, ctx_cat_plane[DCT_LUMA_8x8][p], i8*4+p*16, h->dct.luma8x8[i8+p*4], 0 );
1155 x264_cabac_block_residual_8x8( h, cb, DCT_LUMA_8x8, h->dct.luma8x8[i8] );
1158 for( int p = 0; p < plane_count; p++ )
1159 for( int i4 = 0; i4 < 4; i4++ )
1160 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_4x4][p], i4+i8*4+p*16, h->dct.luma4x4[i4+i8*4+p*16], 0 );
1163 if( h->mb.i_cbp_chroma )
1165 if( CHROMA_FORMAT == CHROMA_422 )
1167 int offset = (5*i8) & 0x09;
1168 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 16+offset, h->dct.luma4x4[16+offset]+1, 0 );
1169 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 18+offset, h->dct.luma4x4[18+offset]+1, 0 );
1170 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 32+offset, h->dct.luma4x4[32+offset]+1, 0 );
1171 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 34+offset, h->dct.luma4x4[34+offset]+1, 0 );
1175 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 16+i8, h->dct.luma4x4[16+i8]+1, 0 );
1176 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, 32+i8, h->dct.luma4x4[32+i8]+1, 0 );
1180 i8 += x264_pixel_size[i_pixel].h >> 3;
1184 static void x264_subpartition_size_cabac( x264_t *h, x264_cabac_t *cb, int i4, int i_pixel )
1186 int b_8x4 = i_pixel == PIXEL_8x4;
1187 int plane_count = CHROMA444 ? 3 : 1;
1188 if( i_pixel == PIXEL_4x4 )
1189 x264_cabac_mvd( h, cb, 0, i4, 1, 1 );
1191 x264_cabac_mvd( h, cb, 0, i4, 1+b_8x4, 2-b_8x4 );
1192 for( int p = 0; p < plane_count; p++ )
1194 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_4x4][p], p*16+i4, h->dct.luma4x4[p*16+i4], 0 );
1195 if( i_pixel != PIXEL_4x4 )
1196 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_4x4][p], p*16+i4+2-b_8x4, h->dct.luma4x4[p*16+i4+2-b_8x4], 0 );
1200 static void x264_partition_i8x8_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_mode )
1202 const int i_pred = x264_mb_predict_intra4x4_mode( h, 4*i8 );
1203 i_mode = x264_mb_pred_mode4x4_fix( i_mode );
1204 x264_cabac_intra4x4_pred_mode( cb, i_pred, i_mode );
1205 x264_cabac_cbp_luma( h, cb );
1206 if( h->mb.i_cbp_luma & (1 << i8) )
1209 for( int p = 0; p < 3; p++ )
1210 x264_cabac_block_residual_8x8_cbf( h, cb, ctx_cat_plane[DCT_LUMA_8x8][p], i8*4+p*16, h->dct.luma8x8[i8+p*4], 1 );
1212 x264_cabac_block_residual_8x8( h, cb, DCT_LUMA_8x8, h->dct.luma8x8[i8] );
1216 static void x264_partition_i4x4_size_cabac( x264_t *h, x264_cabac_t *cb, int i4, int i_mode )
1218 const int i_pred = x264_mb_predict_intra4x4_mode( h, i4 );
1219 int plane_count = CHROMA444 ? 3 : 1;
1220 i_mode = x264_mb_pred_mode4x4_fix( i_mode );
1221 x264_cabac_intra4x4_pred_mode( cb, i_pred, i_mode );
1222 for( int p = 0; p < plane_count; p++ )
1223 x264_cabac_block_residual_cbf( h, cb, ctx_cat_plane[DCT_LUMA_4x4][p], i4+p*16, h->dct.luma4x4[i4+p*16], 1 );
1226 static void x264_chroma_size_cabac( x264_t *h, x264_cabac_t *cb )
1228 x264_cabac_intra_chroma_pred_mode( h, cb );
1229 x264_cabac_cbp_chroma( h, cb );
1230 if( h->mb.i_cbp_chroma )
1232 if( CHROMA_FORMAT == CHROMA_422 )
1234 x264_cabac_block_residual_422_dc_cbf( h, cb, 0, 1 );
1235 x264_cabac_block_residual_422_dc_cbf( h, cb, 1, 1 );
1239 x264_cabac_block_residual_dc_cbf( h, cb, DCT_CHROMA_DC, CHROMA_DC+0, h->dct.chroma_dc[0], 1 );
1240 x264_cabac_block_residual_dc_cbf( h, cb, DCT_CHROMA_DC, CHROMA_DC+1, h->dct.chroma_dc[1], 1 );
1243 if( h->mb.i_cbp_chroma == 2 )
1245 int step = 8 << CHROMA_V_SHIFT;
1246 for( int i = 16; i < 3*16; i += step )
1247 for( int j = i; j < i+4; j++ )
1248 x264_cabac_block_residual_cbf( h, cb, DCT_CHROMA_AC, j, h->dct.luma4x4[j]+1, 1 );