1 /*****************************************************************************
2 * cabac.c: cabac bitstream writing
3 *****************************************************************************
4 * Copyright (C) 2003-2010 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 );
69 static void x264_cabac_mb_type( x264_t *h, x264_cabac_t *cb )
71 const int i_mb_type = h->mb.i_type;
74 (!(h->mb.i_mb_y & 1) || IS_SKIP(h->mb.type[h->mb.i_mb_xy - h->mb.i_mb_stride])) )
76 x264_cabac_encode_decision_noup( cb, 70 + h->mb.cache.i_neighbour_interlaced, h->mb.b_interlaced );
79 if( h->sh.i_type == SLICE_TYPE_I )
82 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.i_mb_type_left != I_4x4 )
84 if( (h->mb.i_neighbour & MB_TOP) && h->mb.i_mb_type_top != I_4x4 )
87 x264_cabac_mb_type_intra( h, cb, i_mb_type, 3+ctx, 3+3, 3+4, 3+5, 3+6, 3+7 );
89 else if( h->sh.i_type == SLICE_TYPE_P )
91 /* prefix: 14, suffix: 17 */
92 if( i_mb_type == P_L0 )
94 x264_cabac_encode_decision_noup( cb, 14, 0 );
95 x264_cabac_encode_decision_noup( cb, 15, h->mb.i_partition != D_16x16 );
96 x264_cabac_encode_decision_noup( cb, 17-(h->mb.i_partition == D_16x16), h->mb.i_partition == D_16x8 );
98 else if( i_mb_type == P_8x8 )
100 x264_cabac_encode_decision_noup( cb, 14, 0 );
101 x264_cabac_encode_decision_noup( cb, 15, 0 );
102 x264_cabac_encode_decision_noup( cb, 16, 1 );
107 x264_cabac_encode_decision_noup( cb, 14, 1 );
110 x264_cabac_mb_type_intra( h, cb, i_mb_type, 17+0, 17+1, 17+2, 17+2, 17+3, 17+3 );
113 else //if( h->sh.i_type == SLICE_TYPE_B )
116 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.i_mb_type_left != B_SKIP && h->mb.i_mb_type_left != B_DIRECT )
118 if( (h->mb.i_neighbour & MB_TOP) && h->mb.i_mb_type_top != B_SKIP && h->mb.i_mb_type_top != B_DIRECT )
121 if( i_mb_type == B_DIRECT )
123 x264_cabac_encode_decision_noup( cb, 27+ctx, 0 );
126 x264_cabac_encode_decision_noup( cb, 27+ctx, 1 );
128 if( i_mb_type == B_8x8 )
130 x264_cabac_encode_decision_noup( cb, 27+3, 1 );
131 x264_cabac_encode_decision_noup( cb, 27+4, 1 );
132 x264_cabac_encode_decision( cb, 27+5, 1 );
133 x264_cabac_encode_decision( cb, 27+5, 1 );
134 x264_cabac_encode_decision_noup( cb, 27+5, 1 );
136 else if( IS_INTRA( i_mb_type ) )
139 x264_cabac_encode_decision_noup( cb, 27+3, 1 );
140 x264_cabac_encode_decision_noup( cb, 27+4, 1 );
141 x264_cabac_encode_decision( cb, 27+5, 1 );
142 x264_cabac_encode_decision( cb, 27+5, 0 );
143 x264_cabac_encode_decision( cb, 27+5, 1 );
146 x264_cabac_mb_type_intra( h, cb, i_mb_type, 32+0, 32+1, 32+2, 32+2, 32+3, 32+3 );
150 static const uint8_t i_mb_bits[9*3] =
152 0x31, 0x29, 0x4, /* L0 L0 */
153 0x35, 0x2d, 0, /* L0 L1 */
154 0x43, 0x63, 0, /* L0 BI */
155 0x3d, 0x2f, 0, /* L1 L0 */
156 0x39, 0x25, 0x6, /* L1 L1 */
157 0x53, 0x73, 0, /* L1 BI */
158 0x4b, 0x6b, 0, /* BI L0 */
159 0x5b, 0x7b, 0, /* BI L1 */
160 0x47, 0x67, 0x21 /* BI BI */
163 const int idx = (i_mb_type - B_L0_L0) * 3 + (h->mb.i_partition - D_16x8);
164 int bits = i_mb_bits[idx];
166 x264_cabac_encode_decision_noup( cb, 27+3, bits&1 );
167 x264_cabac_encode_decision( cb, 27+5-(bits&1), (bits>>1)&1 ); bits >>= 2;
170 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
171 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
172 x264_cabac_encode_decision( cb, 27+5, bits&1 ); bits >>= 1;
174 x264_cabac_encode_decision_noup( cb, 27+5, bits&1 );
180 static void x264_cabac_mb_intra4x4_pred_mode( x264_cabac_t *cb, int i_pred, int i_mode )
182 if( i_pred == i_mode )
183 x264_cabac_encode_decision( cb, 68, 1 );
186 x264_cabac_encode_decision( cb, 68, 0 );
187 if( i_mode > i_pred )
189 x264_cabac_encode_decision( cb, 69, (i_mode )&0x01 );
190 x264_cabac_encode_decision( cb, 69, (i_mode >> 1)&0x01 );
191 x264_cabac_encode_decision( cb, 69, (i_mode >> 2) );
195 static void x264_cabac_mb_intra_chroma_pred_mode( x264_t *h, x264_cabac_t *cb )
197 const int i_mode = x264_mb_pred_mode8x8c_fix[h->mb.i_chroma_pred_mode];
200 /* No need to test for I4x4 or I_16x16 as cache_save handle that */
201 if( (h->mb.i_neighbour & MB_LEFT) && h->mb.chroma_pred_mode[h->mb.i_mb_left_xy] != 0 )
203 if( (h->mb.i_neighbour & MB_TOP) && h->mb.chroma_pred_mode[h->mb.i_mb_top_xy] != 0 )
206 x264_cabac_encode_decision_noup( cb, 64 + ctx, i_mode > 0 );
209 x264_cabac_encode_decision( cb, 64 + 3, i_mode > 1 );
211 x264_cabac_encode_decision_noup( cb, 64 + 3, i_mode > 2 );
215 static void x264_cabac_mb_cbp_luma( x264_t *h, x264_cabac_t *cb )
217 int cbp = h->mb.i_cbp_luma;
218 int cbp_l = h->mb.cache.i_cbp_left;
219 int cbp_t = h->mb.cache.i_cbp_top;
220 x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 1) & 1) - ((cbp_t >> 1) & 2), (cbp >> 0) & 1 );
221 x264_cabac_encode_decision ( cb, 76 - ((cbp >> 0) & 1) - ((cbp_t >> 2) & 2), (cbp >> 1) & 1 );
222 x264_cabac_encode_decision ( cb, 76 - ((cbp_l >> 3) & 1) - ((cbp << 1) & 2), (cbp >> 2) & 1 );
223 x264_cabac_encode_decision_noup( cb, 76 - ((cbp >> 2) & 1) - ((cbp >> 0) & 2), (cbp >> 3) & 1 );
226 static void x264_cabac_mb_cbp_chroma( x264_t *h, x264_cabac_t *cb )
228 int cbp_a = h->mb.cache.i_cbp_left & 0x30;
229 int cbp_b = h->mb.cache.i_cbp_top & 0x30;
232 if( cbp_a && h->mb.cache.i_cbp_left != -1 ) ctx++;
233 if( cbp_b && h->mb.cache.i_cbp_top != -1 ) ctx+=2;
234 if( h->mb.i_cbp_chroma == 0 )
235 x264_cabac_encode_decision_noup( cb, 77 + ctx, 0 );
238 x264_cabac_encode_decision_noup( cb, 77 + ctx, 1 );
241 if( cbp_a == 0x20 ) ctx++;
242 if( cbp_b == 0x20 ) ctx += 2;
243 x264_cabac_encode_decision_noup( cb, 77 + ctx, h->mb.i_cbp_chroma >> 1 );
247 static void x264_cabac_mb_qp_delta( x264_t *h, x264_cabac_t *cb )
249 int i_dqp = h->mb.i_qp - h->mb.i_last_qp;
252 /* Avoid writing a delta quant if we have an empty i16x16 block, e.g. in a completely flat background area */
253 if( h->mb.i_type == I_16x16 && !h->mb.cbp[h->mb.i_mb_xy] )
256 h->mb.i_qp = h->mb.i_last_qp;
261 /* Since, per the above, empty-CBP I16x16 blocks never have delta quants,
262 * we don't have to check for them. */
263 ctx = h->mb.i_last_dqp && h->mb.cbp[h->mb.i_mb_prev_xy];
267 int val = i_dqp <= 0 ? (-2*i_dqp) : (2*i_dqp - 1);
268 /* dqp is interpreted modulo (QP_MAX+1) */
269 if( val >= QP_MAX && val != QP_MAX+1 )
270 val = 2*QP_MAX+1 - val;
273 x264_cabac_encode_decision( cb, 60 + ctx, 1 );
277 x264_cabac_encode_decision_noup( cb, 60 + ctx, 0 );
281 void x264_cabac_mb_skip( x264_t *h, int b_skip )
283 int ctx = ((h->mb.i_neighbour & MB_LEFT) && !IS_SKIP( h->mb.i_mb_type_left ))
284 + ((h->mb.i_neighbour & MB_TOP) && !IS_SKIP( h->mb.i_mb_type_top ))
285 + (h->sh.i_type == SLICE_TYPE_P ? 11 : 24);
286 x264_cabac_encode_decision( &h->cabac, ctx, b_skip );
290 static inline void x264_cabac_mb_sub_p_partition( x264_cabac_t *cb, int i_sub )
292 if( i_sub == D_L0_8x8 )
294 x264_cabac_encode_decision( cb, 21, 1 );
297 x264_cabac_encode_decision( cb, 21, 0 );
298 if( i_sub == D_L0_8x4 )
299 x264_cabac_encode_decision( cb, 22, 0 );
302 x264_cabac_encode_decision( cb, 22, 1 );
303 x264_cabac_encode_decision( cb, 23, i_sub == D_L0_4x8 );
307 static ALWAYS_INLINE void x264_cabac_mb_sub_b_partition( x264_cabac_t *cb, int i_sub )
309 if( i_sub == D_DIRECT_8x8 )
311 x264_cabac_encode_decision( cb, 36, 0 );
314 x264_cabac_encode_decision( cb, 36, 1 );
315 if( i_sub == D_BI_8x8 )
317 x264_cabac_encode_decision( cb, 37, 1 );
318 x264_cabac_encode_decision( cb, 38, 0 );
319 x264_cabac_encode_decision( cb, 39, 0 );
320 x264_cabac_encode_decision( cb, 39, 0 );
323 x264_cabac_encode_decision( cb, 37, 0 );
324 x264_cabac_encode_decision( cb, 39, i_sub == D_L1_8x8 );
327 static ALWAYS_INLINE void x264_cabac_mb_transform_size( x264_t *h, x264_cabac_t *cb )
329 int ctx = 399 + h->mb.cache.i_neighbour_transform_size;
330 x264_cabac_encode_decision_noup( cb, ctx, h->mb.b_transform_8x8 );
333 static void x264_cabac_mb_ref( x264_t *h, x264_cabac_t *cb, int i_list, int idx )
335 const int i8 = x264_scan8[idx];
336 const int i_refa = h->mb.cache.ref[i_list][i8 - 1];
337 const int i_refb = h->mb.cache.ref[i_list][i8 - 8];
340 if( i_refa > 0 && !h->mb.cache.skip[i8 - 1] )
342 if( i_refb > 0 && !h->mb.cache.skip[i8 - 8] )
345 for( int i_ref = h->mb.cache.ref[i_list][i8]; i_ref > 0; i_ref-- )
347 x264_cabac_encode_decision( cb, 54 + ctx, 1 );
350 x264_cabac_encode_decision( cb, 54 + ctx, 0 );
353 static ALWAYS_INLINE int x264_cabac_mb_mvd_cpn( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int l, int mvd, int ctx )
355 const int i_abs = abs( mvd );
356 const int ctxbase = l ? 47 : 40;
359 x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
362 x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
365 for( int i = 1; i < i_abs; i++ )
366 x264_cabac_encode_decision( cb, ctxbase + i + 2, 1 );
367 x264_cabac_encode_decision( cb, ctxbase + i_abs + 2, 0 );
368 x264_cabac_encode_bypass( cb, mvd < 0 );
372 x264_cabac_encode_decision( cb, ctxbase + 3, 1 );
373 x264_cabac_encode_decision( cb, ctxbase + 4, 1 );
374 x264_cabac_encode_decision( cb, ctxbase + 5, 1 );
377 cb->f8_bits_encoded += cabac_size_unary[i_abs - 3][cb->state[ctxbase+6]];
378 cb->state[ctxbase+6] = cabac_transition_unary[i_abs - 3][cb->state[ctxbase+6]];
382 cb->f8_bits_encoded += cabac_size_5ones[cb->state[ctxbase+6]];
383 cb->state[ctxbase+6] = cabac_transition_5ones[cb->state[ctxbase+6]];
384 x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
389 static const uint8_t ctxes[8] = { 3,4,5,6,6,6,6,6 };
392 x264_cabac_encode_decision( cb, ctxbase + ctx, 0 );
395 x264_cabac_encode_decision( cb, ctxbase + ctx, 1 );
398 for( int i = 1; i < i_abs; i++ )
399 x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
400 x264_cabac_encode_decision( cb, ctxbase + ctxes[i_abs-1], 0 );
404 for( int i = 1; i < 9; i++ )
405 x264_cabac_encode_decision( cb, ctxbase + ctxes[i-1], 1 );
406 x264_cabac_encode_ue_bypass( cb, 3, i_abs - 9 );
408 x264_cabac_encode_bypass( cb, mvd < 0 );
411 /* Since we don't need to keep track of MVDs larger than 33, just cap the value.
412 * This lets us store MVDs as 8-bit values instead of 16-bit. */
413 return X264_MIN( i_abs, 33 );
416 static NOINLINE uint16_t x264_cabac_mb_mvd( x264_t *h, x264_cabac_t *cb, int i_list, int idx, int width )
418 ALIGNED_4( int16_t mvp[2] );
422 x264_mb_predict_mv( h, i_list, idx, width, mvp );
423 mdx = h->mb.cache.mv[i_list][x264_scan8[idx]][0] - mvp[0];
424 mdy = h->mb.cache.mv[i_list][x264_scan8[idx]][1] - mvp[1];
425 uint16_t amvd = x264_cabac_mvd_sum(h->mb.cache.mvd[i_list][x264_scan8[idx] - 1],
426 h->mb.cache.mvd[i_list][x264_scan8[idx] - 8]);
429 mdx = x264_cabac_mb_mvd_cpn( h, cb, i_list, idx, 0, mdx, amvd&0xFF );
430 mdy = x264_cabac_mb_mvd_cpn( h, cb, i_list, idx, 1, mdy, amvd>>8 );
432 return pack8to16(mdx,mdy);
435 #define x264_cabac_mb_mvd(h,cb,i_list,idx,width,height)\
438 uint16_t mvd = x264_cabac_mb_mvd(h,cb,i_list,idx,width);\
439 x264_macroblock_cache_mvd( h, block_idx_x[idx], block_idx_y[idx], width, height, i_list, mvd );\
442 static inline void x264_cabac_mb8x8_mvd( x264_t *h, x264_cabac_t *cb, int i )
444 switch( h->mb.i_sub_partition[i] )
447 x264_cabac_mb_mvd( h, cb, 0, 4*i, 2, 2 );
450 x264_cabac_mb_mvd( h, cb, 0, 4*i+0, 2, 1 );
451 x264_cabac_mb_mvd( h, cb, 0, 4*i+2, 2, 1 );
454 x264_cabac_mb_mvd( h, cb, 0, 4*i+0, 1, 2 );
455 x264_cabac_mb_mvd( h, cb, 0, 4*i+1, 1, 2 );
458 x264_cabac_mb_mvd( h, cb, 0, 4*i+0, 1, 1 );
459 x264_cabac_mb_mvd( h, cb, 0, 4*i+1, 1, 1 );
460 x264_cabac_mb_mvd( h, cb, 0, 4*i+2, 1, 1 );
461 x264_cabac_mb_mvd( h, cb, 0, 4*i+3, 1, 1 );
468 /* i_ctxBlockCat: 0-> DC 16x16 i_idx = 0
469 * 1-> AC 16x16 i_idx = luma4x4idx
470 * 2-> Luma4x4 i_idx = luma4x4idx
471 * 3-> DC Chroma i_idx = iCbCr
472 * 4-> AC Chroma i_idx = 4 * iCbCr + chroma4x4idx
473 * 5-> Luma8x8 i_idx = luma8x8idx
476 static int ALWAYS_INLINE x264_cabac_mb_cbf_ctxidxinc( x264_t *h, int i_cat, int i_idx, int b_intra )
486 /* no need to test for skip/pcm */
487 i_nza = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 1];
488 i_nzb = h->mb.cache.non_zero_count[x264_scan8[i_idx] - 8];
489 if( x264_constant_p(b_intra) && !b_intra )
490 return 85 + 4*i_cat + ((2*i_nzb + i_nza)&0x7f);
493 i_nza &= 0x7f + (b_intra << 7);
494 i_nzb &= 0x7f + (b_intra << 7);
495 return 85 + 4*i_cat + 2*!!i_nzb + !!i_nza;
498 i_nza = (h->mb.cache.i_cbp_left >> 8) & 1;
499 i_nzb = (h->mb.cache.i_cbp_top >> 8) & 1;
500 return 85 + 4*i_cat + 2*i_nzb + i_nza;
502 /* no need to test skip/pcm */
504 i_nza = h->mb.cache.i_cbp_left != -1 ? (h->mb.cache.i_cbp_left >> (9 + i_idx)) & 1 : b_intra;
505 i_nzb = h->mb.cache.i_cbp_top != -1 ? (h->mb.cache.i_cbp_top >> (9 + i_idx)) & 1 : b_intra;
506 return 85 + 4*i_cat + 2*i_nzb + i_nza;
513 static const uint16_t significant_coeff_flag_offset[2][6] = {
514 { 105, 120, 134, 149, 152, 402 },
515 { 277, 292, 306, 321, 324, 436 }
517 static const uint16_t last_coeff_flag_offset[2][6] = {
518 { 166, 181, 195, 210, 213, 417 },
519 { 338, 353, 367, 382, 385, 451 }
521 static const uint16_t coeff_abs_level_m1_offset[6] =
522 { 227, 237, 247, 257, 266, 426 };
523 static const uint8_t significant_coeff_flag_offset_8x8[2][63] =
525 0, 1, 2, 3, 4, 5, 5, 4, 4, 3, 3, 4, 4, 4, 5, 5,
526 4, 4, 4, 4, 3, 3, 6, 7, 7, 7, 8, 9,10, 9, 8, 7,
527 7, 6,11,12,13,11, 6, 7, 8, 9,14,10, 9, 8, 6,11,
528 12,13,11, 6, 9,14,10, 9,11,12,13,11,14,10,12
530 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 7, 7, 8, 4, 5,
531 6, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,11,12,11,
532 9, 9,10,10, 8,11,12,11, 9, 9,10,10, 8,13,13, 9,
533 9,10,10, 8,13,13, 9, 9,10,10,14,14,14,14,14
535 static const uint8_t last_coeff_flag_offset_8x8[63] = {
536 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
537 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
538 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
539 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8
542 // node ctx: 0..3: abslevel1 (with abslevelgt1 == 0).
543 // 4..7: abslevelgt1 + 3 (and abslevel1 doesn't matter).
544 /* map node ctx => cabac ctx for level=1 */
545 static const uint8_t coeff_abs_level1_ctx[8] = { 1, 2, 3, 4, 0, 0, 0, 0 };
546 /* map node ctx => cabac ctx for level>1 */
547 static const uint8_t coeff_abs_levelgt1_ctx[8] = { 5, 5, 5, 5, 6, 7, 8, 9 };
548 static const uint8_t coeff_abs_level_transition[2][8] = {
549 /* update node ctx after coding a level=1 */
550 { 1, 2, 3, 3, 4, 5, 6, 7 },
551 /* update node ctx after coding a level>1 */
552 { 4, 4, 4, 4, 5, 6, 7, 7 }
554 static const uint8_t count_cat_m1[5] = {15, 14, 15, 3, 14};
557 static void block_residual_write_cabac( x264_t *h, x264_cabac_t *cb, int i_ctxBlockCat, dctcoef *l )
559 const int i_ctx_sig = significant_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
560 const int i_ctx_last = last_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
561 const int i_ctx_level = coeff_abs_level_m1_offset[i_ctxBlockCat];
562 const uint8_t *sig_offset = significant_coeff_flag_offset_8x8[h->mb.b_interlaced];
563 int i_coeff_abs_m1[64];
564 int i_coeff_sign[64];
570 i_last = h->quantf.coeff_last[i_ctxBlockCat](l);
572 #define WRITE_SIGMAP( l8x8 )\
577 i_coeff_abs_m1[i_coeff] = abs(l[i]) - 1;\
578 i_coeff_sign[i_coeff] = l[i] < 0;\
580 x264_cabac_encode_decision( cb, i_ctx_sig + (l8x8 ? sig_offset[i] : i), 1 );\
583 x264_cabac_encode_decision( cb, i_ctx_last + (l8x8 ? last_coeff_flag_offset_8x8[i] : i), 1 );\
587 x264_cabac_encode_decision( cb, i_ctx_last + (l8x8 ? last_coeff_flag_offset_8x8[i] : i), 0 );\
590 x264_cabac_encode_decision( cb, i_ctx_sig + (l8x8 ? sig_offset[i] : i), 0 );\
592 if( i == i_count_m1 )\
594 i_coeff_abs_m1[i_coeff] = abs(l[i]) - 1;\
595 i_coeff_sign[i_coeff] = l[i] < 0;\
601 if( i_ctxBlockCat == DCT_LUMA_8x8 )
603 const int i_count_m1 = 63;
608 const int i_count_m1 = count_cat_m1[i_ctxBlockCat];
617 /* write coeff_abs - 1 */
618 i_prefix = X264_MIN( i_coeff_abs_m1[i_coeff], 14 );
619 ctx = coeff_abs_level1_ctx[node_ctx] + i_ctx_level;
623 x264_cabac_encode_decision( cb, ctx, 1 );
624 ctx = coeff_abs_levelgt1_ctx[node_ctx] + i_ctx_level;
625 for( i = 0; i < i_prefix - 1; i++ )
626 x264_cabac_encode_decision( cb, ctx, 1 );
628 x264_cabac_encode_decision( cb, ctx, 0 );
630 x264_cabac_encode_ue_bypass( cb, 0, i_coeff_abs_m1[i_coeff] - 14 );
632 node_ctx = coeff_abs_level_transition[1][node_ctx];
636 x264_cabac_encode_decision( cb, ctx, 0 );
637 node_ctx = coeff_abs_level_transition[0][node_ctx];
640 x264_cabac_encode_bypass( cb, i_coeff_sign[i_coeff] );
641 } while( i_coeff > 0 );
643 #define block_residual_write_cabac_8x8( h, cb, l ) block_residual_write_cabac( h, cb, DCT_LUMA_8x8, l )
647 /* Faster RDO by merging sigmap and level coding. Note that for 8x8dct
648 * this is slightly incorrect because the sigmap is not reversible
649 * (contexts are repeated). However, there is nearly no quality penalty
650 * for this (~0.001db) and the speed boost (~30%) is worth it. */
651 static void ALWAYS_INLINE block_residual_write_cabac_internal( x264_t *h, x264_cabac_t *cb, int i_ctxBlockCat, dctcoef *l, int b_8x8 )
653 const int i_ctx_sig = significant_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
654 const int i_ctx_last = last_coeff_flag_offset[h->mb.b_interlaced][i_ctxBlockCat];
655 const int i_ctx_level = coeff_abs_level_m1_offset[i_ctxBlockCat];
656 const uint8_t *sig_offset = significant_coeff_flag_offset_8x8[h->mb.b_interlaced];
657 int i_last, i_coeff_abs, ctx, node_ctx;
659 i_last = h->quantf.coeff_last[i_ctxBlockCat](l);
661 i_coeff_abs = abs(l[i_last]);
662 ctx = coeff_abs_level1_ctx[0] + i_ctx_level;
664 if( i_last != (b_8x8 ? 63 : count_cat_m1[i_ctxBlockCat]) )
666 x264_cabac_encode_decision( cb, i_ctx_sig + (b_8x8?sig_offset[i_last]:i_last), 1 );
667 x264_cabac_encode_decision( cb, i_ctx_last + (b_8x8?last_coeff_flag_offset_8x8[i_last]:i_last), 1 );
670 if( i_coeff_abs > 1 )
672 x264_cabac_encode_decision( cb, ctx, 1 );
673 ctx = coeff_abs_levelgt1_ctx[0] + i_ctx_level;
674 if( i_coeff_abs < 15 )
676 cb->f8_bits_encoded += cabac_size_unary[i_coeff_abs-1][cb->state[ctx]];
677 cb->state[ctx] = cabac_transition_unary[i_coeff_abs-1][cb->state[ctx]];
681 cb->f8_bits_encoded += cabac_size_unary[14][cb->state[ctx]];
682 cb->state[ctx] = cabac_transition_unary[14][cb->state[ctx]];
683 x264_cabac_encode_ue_bypass( cb, 0, i_coeff_abs - 15 );
685 node_ctx = coeff_abs_level_transition[1][0];
689 x264_cabac_encode_decision( cb, ctx, 0 );
690 node_ctx = coeff_abs_level_transition[0][0];
691 x264_cabac_encode_bypass( cb, 0 ); // sign
694 for( int i = i_last-1 ; i >= 0; i-- )
698 i_coeff_abs = abs(l[i]);
699 x264_cabac_encode_decision( cb, i_ctx_sig + (b_8x8?sig_offset[i]:i), 1 );
700 x264_cabac_encode_decision( cb, i_ctx_last + (b_8x8?last_coeff_flag_offset_8x8[i]:i), 0 );
701 ctx = coeff_abs_level1_ctx[node_ctx] + i_ctx_level;
703 if( i_coeff_abs > 1 )
705 x264_cabac_encode_decision( cb, ctx, 1 );
706 ctx = coeff_abs_levelgt1_ctx[node_ctx] + i_ctx_level;
707 if( i_coeff_abs < 15 )
709 cb->f8_bits_encoded += cabac_size_unary[i_coeff_abs-1][cb->state[ctx]];
710 cb->state[ctx] = cabac_transition_unary[i_coeff_abs-1][cb->state[ctx]];
714 cb->f8_bits_encoded += cabac_size_unary[14][cb->state[ctx]];
715 cb->state[ctx] = cabac_transition_unary[14][cb->state[ctx]];
716 x264_cabac_encode_ue_bypass( cb, 0, i_coeff_abs - 15 );
718 node_ctx = coeff_abs_level_transition[1][node_ctx];
722 x264_cabac_encode_decision( cb, ctx, 0 );
723 node_ctx = coeff_abs_level_transition[0][node_ctx];
724 x264_cabac_encode_bypass( cb, 0 );
728 x264_cabac_encode_decision( cb, i_ctx_sig + (b_8x8?sig_offset[i]:i), 0 );
732 static void block_residual_write_cabac_8x8( x264_t *h, x264_cabac_t *cb, dctcoef *l )
734 block_residual_write_cabac_internal( h, cb, DCT_LUMA_8x8, l, 1 );
736 static void block_residual_write_cabac( x264_t *h, x264_cabac_t *cb, int i_ctxBlockCat, dctcoef *l )
738 block_residual_write_cabac_internal( h, cb, i_ctxBlockCat, l, 0 );
742 #define block_residual_write_cabac_cbf( h, cb, i_ctxBlockCat, i_idx, l, b_intra )\
744 int ctxidxinc = x264_cabac_mb_cbf_ctxidxinc( h, i_ctxBlockCat, i_idx, b_intra );\
745 if( h->mb.cache.non_zero_count[x264_scan8[i_idx]] )\
747 x264_cabac_encode_decision( cb, ctxidxinc, 1 );\
748 block_residual_write_cabac( h, cb, i_ctxBlockCat, l );\
751 x264_cabac_encode_decision( cb, ctxidxinc, 0 );\
754 void x264_macroblock_write_cabac( x264_t *h, x264_cabac_t *cb )
756 const int i_mb_type = h->mb.i_type;
760 const int i_mb_pos_start = x264_cabac_pos( cb );
764 /* Write the MB type */
765 x264_cabac_mb_type( h, cb );
768 if( i_mb_type == I_PCM )
770 i_mb_pos_tex = x264_cabac_pos( cb );
771 h->stat.frame.i_mv_bits += i_mb_pos_tex - i_mb_pos_start;
774 bs_init( &s, cb->p, cb->p_end - cb->p );
776 for( int i = 0; i < 256; i++ )
777 bs_write( &s, BIT_DEPTH, h->mb.pic.p_fenc[0][i] );
778 for( int ch = 1; ch < 3; ch++ )
779 for( int i = 0; i < 8; i++ )
780 for( int j = 0; j < 8; j++ )
781 bs_write( &s, BIT_DEPTH, h->mb.pic.p_fenc[ch][i*FENC_STRIDE+j] );
785 x264_cabac_encode_init_core( cb );
787 h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
792 if( IS_INTRA( i_mb_type ) )
794 if( h->pps->b_transform_8x8_mode && i_mb_type != I_16x16 )
795 x264_cabac_mb_transform_size( h, cb );
797 if( i_mb_type != I_16x16 )
799 int di = h->mb.b_transform_8x8 ? 4 : 1;
800 for( int i = 0; i < 16; i += di )
802 const int i_pred = x264_mb_predict_intra4x4_mode( h, i );
803 const int i_mode = x264_mb_pred_mode4x4_fix( h->mb.cache.intra4x4_pred_mode[x264_scan8[i]] );
804 x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
808 x264_cabac_mb_intra_chroma_pred_mode( h, cb );
810 else if( i_mb_type == P_L0 )
812 if( h->mb.i_partition == D_16x16 )
814 if( h->mb.pic.i_fref[0] > 1 )
816 x264_cabac_mb_ref( h, cb, 0, 0 );
818 x264_cabac_mb_mvd( h, cb, 0, 0, 4, 4 );
820 else if( h->mb.i_partition == D_16x8 )
822 if( h->mb.pic.i_fref[0] > 1 )
824 x264_cabac_mb_ref( h, cb, 0, 0 );
825 x264_cabac_mb_ref( h, cb, 0, 8 );
827 x264_cabac_mb_mvd( h, cb, 0, 0, 4, 2 );
828 x264_cabac_mb_mvd( h, cb, 0, 8, 4, 2 );
830 else //if( h->mb.i_partition == D_8x16 )
832 if( h->mb.pic.i_fref[0] > 1 )
834 x264_cabac_mb_ref( h, cb, 0, 0 );
835 x264_cabac_mb_ref( h, cb, 0, 4 );
837 x264_cabac_mb_mvd( h, cb, 0, 0, 2, 4 );
838 x264_cabac_mb_mvd( h, cb, 0, 4, 2, 4 );
841 else if( i_mb_type == P_8x8 )
844 for( int i = 0; i < 4; i++ )
845 x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[i] );
848 if( h->mb.pic.i_fref[0] > 1 )
850 x264_cabac_mb_ref( h, cb, 0, 0 );
851 x264_cabac_mb_ref( h, cb, 0, 4 );
852 x264_cabac_mb_ref( h, cb, 0, 8 );
853 x264_cabac_mb_ref( h, cb, 0, 12 );
856 for( int i = 0; i < 4; i++ )
857 x264_cabac_mb8x8_mvd( h, cb, i );
859 else if( i_mb_type == B_8x8 )
862 for( int i = 0; i < 4; i++ )
863 x264_cabac_mb_sub_b_partition( cb, h->mb.i_sub_partition[i] );
866 if( h->mb.pic.i_fref[0] > 1 )
867 for( int i = 0; i < 4; i++ )
868 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i] ] )
869 x264_cabac_mb_ref( h, cb, 0, 4*i );
871 if( h->mb.pic.i_fref[1] > 1 )
872 for( int i = 0; i < 4; i++ )
873 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i] ] )
874 x264_cabac_mb_ref( h, cb, 1, 4*i );
876 for( int i = 0; i < 4; i++ )
877 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i] ] )
878 x264_cabac_mb_mvd( h, cb, 0, 4*i, 2, 2 );
880 for( int i = 0; i < 4; i++ )
881 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i] ] )
882 x264_cabac_mb_mvd( h, cb, 1, 4*i, 2, 2 );
884 else if( i_mb_type != B_DIRECT )
887 const uint8_t (*b_list)[2] = x264_mb_type_list_table[i_mb_type];
888 if( h->mb.pic.i_fref[0] > 1 )
891 x264_cabac_mb_ref( h, cb, 0, 0 );
892 if( b_list[0][1] && h->mb.i_partition != D_16x16 )
893 x264_cabac_mb_ref( h, cb, 0, 8 >> (h->mb.i_partition == D_8x16) );
895 if( h->mb.pic.i_fref[1] > 1 )
898 x264_cabac_mb_ref( h, cb, 1, 0 );
899 if( b_list[1][1] && h->mb.i_partition != D_16x16 )
900 x264_cabac_mb_ref( h, cb, 1, 8 >> (h->mb.i_partition == D_8x16) );
902 for( i_list = 0; i_list < 2; i_list++ )
904 if( h->mb.i_partition == D_16x16 )
906 if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 4, 4 );
908 else if( h->mb.i_partition == D_16x8 )
910 if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 4, 2 );
911 if( b_list[i_list][1] ) x264_cabac_mb_mvd( h, cb, i_list, 8, 4, 2 );
913 else //if( h->mb.i_partition == D_8x16 )
915 if( b_list[i_list][0] ) x264_cabac_mb_mvd( h, cb, i_list, 0, 2, 4 );
916 if( b_list[i_list][1] ) x264_cabac_mb_mvd( h, cb, i_list, 4, 2, 4 );
922 i_mb_pos_tex = x264_cabac_pos( cb );
923 h->stat.frame.i_mv_bits += i_mb_pos_tex - i_mb_pos_start;
926 if( i_mb_type != I_16x16 )
928 x264_cabac_mb_cbp_luma( h, cb );
929 x264_cabac_mb_cbp_chroma( h, cb );
932 if( x264_mb_transform_8x8_allowed( h ) && h->mb.i_cbp_luma )
934 x264_cabac_mb_transform_size( h, cb );
937 if( h->mb.i_cbp_luma > 0 || h->mb.i_cbp_chroma > 0 || i_mb_type == I_16x16 )
939 const int b_intra = IS_INTRA( i_mb_type );
940 x264_cabac_mb_qp_delta( h, cb );
943 if( i_mb_type == I_16x16 )
946 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_DC, 24, h->dct.luma16x16_dc, 1 );
949 if( h->mb.i_cbp_luma != 0 )
950 for( int i = 0; i < 16; i++ )
951 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_AC, i, h->dct.luma4x4[i]+1, 1 );
953 else if( h->mb.b_transform_8x8 )
955 for( int i = 0; i < 4; i++ )
956 if( h->mb.i_cbp_luma & ( 1 << i ) )
957 block_residual_write_cabac_8x8( h, cb, h->dct.luma8x8[i] );
961 for( int i = 0; i < 16; i++ )
962 if( h->mb.i_cbp_luma & ( 1 << ( i >> 2 ) ) )
963 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_4x4, i, h->dct.luma4x4[i], b_intra );
966 if( h->mb.i_cbp_chroma ) /* Chroma DC residual present */
968 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_DC, 25, h->dct.chroma_dc[0], b_intra );
969 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_DC, 26, h->dct.chroma_dc[1], b_intra );
970 if( h->mb.i_cbp_chroma&0x02 ) /* Chroma AC residual present */
971 for( int i = 16; i < 24; i++ )
972 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_AC, i, h->dct.luma4x4[i]+1, b_intra );
977 h->stat.frame.i_tex_bits += x264_cabac_pos( cb ) - i_mb_pos_tex;
982 /*****************************************************************************
983 * RD only; doesn't generate a valid bitstream
984 * doesn't write cbp or chroma dc (I don't know how much this matters)
985 * doesn't write ref (never varies between calls, so no point in doing so)
986 * only writes subpartition for p8x8, needed for sub-8x8 mode decision RDO
987 * works on all partition sizes except 16x16
988 *****************************************************************************/
989 static void x264_partition_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_pixel )
991 const int i_mb_type = h->mb.i_type;
992 int b_8x16 = h->mb.i_partition == D_8x16;
994 if( i_mb_type == P_8x8 )
996 x264_cabac_mb8x8_mvd( h, cb, i8 );
997 x264_cabac_mb_sub_p_partition( cb, h->mb.i_sub_partition[i8] );
999 else if( i_mb_type == P_L0 )
1000 x264_cabac_mb_mvd( h, cb, 0, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1001 else if( i_mb_type > B_DIRECT && i_mb_type < B_8x8 )
1003 if( x264_mb_type_list_table[ i_mb_type ][0][!!i8] ) x264_cabac_mb_mvd( h, cb, 0, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1004 if( x264_mb_type_list_table[ i_mb_type ][1][!!i8] ) x264_cabac_mb_mvd( h, cb, 1, 4*i8, 4>>b_8x16, 2<<b_8x16 );
1006 else //if( i_mb_type == B_8x8 )
1008 if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i8] ] )
1009 x264_cabac_mb_mvd( h, cb, 0, 4*i8, 2, 2 );
1010 if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i8] ] )
1011 x264_cabac_mb_mvd( h, cb, 1, 4*i8, 2, 2 );
1014 for( int j = (i_pixel < PIXEL_8x8); j >= 0; j-- )
1016 if( h->mb.i_cbp_luma & (1 << i8) )
1018 if( h->mb.b_transform_8x8 )
1019 block_residual_write_cabac_8x8( h, cb, h->dct.luma8x8[i8] );
1021 for( int i4 = 0; i4 < 4; i4++ )
1022 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_4x4, i4+i8*4, h->dct.luma4x4[i4+i8*4], 0 );
1025 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_AC, 16+i8, h->dct.luma4x4[16+i8]+1, 0 );
1026 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_AC, 20+i8, h->dct.luma4x4[20+i8]+1, 0 );
1028 i8 += x264_pixel_size[i_pixel].h >> 3;
1032 static void x264_subpartition_size_cabac( x264_t *h, x264_cabac_t *cb, int i4, int i_pixel )
1034 int b_8x4 = i_pixel == PIXEL_8x4;
1035 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_4x4, i4, h->dct.luma4x4[i4], 0 );
1036 if( i_pixel == PIXEL_4x4 )
1038 x264_cabac_mb_mvd( h, cb, 0, i4, 1, 1 );
1042 x264_cabac_mb_mvd( h, cb, 0, i4, 1+b_8x4, 2-b_8x4 );
1043 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_4x4, i4+2-b_8x4, h->dct.luma4x4[i4+2-b_8x4], 0 );
1047 static void x264_partition_i8x8_size_cabac( x264_t *h, x264_cabac_t *cb, int i8, int i_mode )
1049 const int i_pred = x264_mb_predict_intra4x4_mode( h, 4*i8 );
1050 i_mode = x264_mb_pred_mode4x4_fix( i_mode );
1051 x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
1052 x264_cabac_mb_cbp_luma( h, cb );
1053 if( h->mb.i_cbp_luma & (1 << i8) )
1054 block_residual_write_cabac_8x8( h, cb, h->dct.luma8x8[i8] );
1057 static void x264_partition_i4x4_size_cabac( x264_t *h, x264_cabac_t *cb, int i4, int i_mode )
1059 const int i_pred = x264_mb_predict_intra4x4_mode( h, i4 );
1060 i_mode = x264_mb_pred_mode4x4_fix( i_mode );
1061 x264_cabac_mb_intra4x4_pred_mode( cb, i_pred, i_mode );
1062 block_residual_write_cabac_cbf( h, cb, DCT_LUMA_4x4, i4, h->dct.luma4x4[i4], 1 );
1065 static void x264_i8x8_chroma_size_cabac( x264_t *h, x264_cabac_t *cb )
1067 x264_cabac_mb_intra_chroma_pred_mode( h, cb );
1068 x264_cabac_mb_cbp_chroma( h, cb );
1069 if( h->mb.i_cbp_chroma > 0 )
1071 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_DC, 25, h->dct.chroma_dc[0], 1 );
1072 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_DC, 26, h->dct.chroma_dc[1], 1 );
1074 if( h->mb.i_cbp_chroma == 2 )
1075 for( int i = 16; i < 24; i++ )
1076 block_residual_write_cabac_cbf( h, cb, DCT_CHROMA_AC, i, h->dct.luma4x4[i]+1, 1 );