Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / snow.h
1 /*
2 * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (C) 2006 Robert Edele <yartrebo@earthlink.net>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #ifndef AVCODEC_SNOW_H
23 #define AVCODEC_SNOW_H
24
25 #include "hpeldsp.h"
26 #include "me_cmp.h"
27 #include "qpeldsp.h"
28 #include "snow_dwt.h"
29
30 #include "rangecoder.h"
31 #include "mathops.h"
32
33 #define FF_MPV_OFFSET(x) (offsetof(MpegEncContext, x) + offsetof(SnowContext, m))
34 #include "mpegvideo.h"
35 #include "h264qpel.h"
36
37 #define MID_STATE 128
38
39 #define MAX_PLANES 4
40 #define QSHIFT 5
41 #define QROOT (1<<QSHIFT)
42 #define LOSSLESS_QLOG -128
43 #define FRAC_BITS 4
44 #define MAX_REF_FRAMES 8
45
46 #define LOG2_OBMC_MAX 8
47 #define OBMC_MAX (1<<(LOG2_OBMC_MAX))
48 typedef struct BlockNode{
49 int16_t mx;
50 int16_t my;
51 uint8_t ref;
52 uint8_t color[3];
53 uint8_t type;
54 //#define TYPE_SPLIT 1
55 #define BLOCK_INTRA 1
56 #define BLOCK_OPT 2
57 //#define TYPE_NOCOLOR 4
58 uint8_t level; //FIXME merge into type?
59 }BlockNode;
60
61 static const BlockNode null_block= { //FIXME add border maybe
62 .color= {128,128,128},
63 .mx= 0,
64 .my= 0,
65 .ref= 0,
66 .type= 0,
67 .level= 0,
68 };
69
70 #define LOG2_MB_SIZE 4
71 #define MB_SIZE (1<<LOG2_MB_SIZE)
72 #define ENCODER_EXTRA_BITS 4
73 #define HTAPS_MAX 8
74
75 typedef struct x_and_coeff{
76 int16_t x;
77 uint16_t coeff;
78 } x_and_coeff;
79
80 typedef struct SubBand{
81 int level;
82 int stride;
83 int width;
84 int height;
85 int qlog; ///< log(qscale)/log[2^(1/6)]
86 DWTELEM *buf;
87 IDWTELEM *ibuf;
88 int buf_x_offset;
89 int buf_y_offset;
90 int stride_line; ///< Stride measured in lines, not pixels.
91 x_and_coeff * x_coeff;
92 struct SubBand *parent;
93 uint8_t state[/*7*2*/ 7 + 512][32];
94 }SubBand;
95
96 typedef struct Plane{
97 int width;
98 int height;
99 SubBand band[MAX_DECOMPOSITIONS][4];
100
101 int htaps;
102 int8_t hcoeff[HTAPS_MAX/2];
103 int diag_mc;
104 int fast_mc;
105
106 int last_htaps;
107 int8_t last_hcoeff[HTAPS_MAX/2];
108 int last_diag_mc;
109 }Plane;
110
111 typedef struct SnowContext{
112 AVClass *class;
113 AVCodecContext *avctx;
114 RangeCoder c;
115 MECmpContext mecc;
116 HpelDSPContext hdsp;
117 QpelDSPContext qdsp;
118 VideoDSPContext vdsp;
119 H264QpelContext h264qpel;
120 MpegvideoEncDSPContext mpvencdsp;
121 SnowDWTContext dwt;
122 const AVFrame *new_picture;
123 AVFrame *input_picture; ///< new_picture with the internal linesizes
124 AVFrame *current_picture;
125 AVFrame *last_picture[MAX_REF_FRAMES];
126 uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4];
127 AVFrame *mconly_picture;
128 // uint8_t q_context[16];
129 uint8_t header_state[32];
130 uint8_t block_state[128 + 32*128];
131 int keyframe;
132 int always_reset;
133 int version;
134 int spatial_decomposition_type;
135 int last_spatial_decomposition_type;
136 int temporal_decomposition_type;
137 int spatial_decomposition_count;
138 int last_spatial_decomposition_count;
139 int temporal_decomposition_count;
140 int max_ref_frames;
141 int ref_frames;
142 int16_t (*ref_mvs[MAX_REF_FRAMES])[2];
143 uint32_t *ref_scores[MAX_REF_FRAMES];
144 DWTELEM *spatial_dwt_buffer;
145 DWTELEM *temp_dwt_buffer;
146 IDWTELEM *spatial_idwt_buffer;
147 IDWTELEM *temp_idwt_buffer;
148 int *run_buffer;
149 int colorspace_type;
150 int chroma_h_shift;
151 int chroma_v_shift;
152 int spatial_scalability;
153 int qlog;
154 int last_qlog;
155 int lambda;
156 int lambda2;
157 int pass1_rc;
158 int mv_scale;
159 int last_mv_scale;
160 int qbias;
161 int last_qbias;
162 #define QBIAS_SHIFT 3
163 int b_width;
164 int b_height;
165 int block_max_depth;
166 int last_block_max_depth;
167 int nb_planes;
168 Plane plane[MAX_PLANES];
169 BlockNode *block;
170 #define ME_CACHE_SIZE 1024
171 unsigned me_cache[ME_CACHE_SIZE];
172 unsigned me_cache_generation;
173 slice_buffer sb;
174 int memc_only;
175 int no_bitstream;
176
177 MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to eventually make the motion estimation independent of MpegEncContext, so this will be removed then (FIXME/XXX)
178
179 uint8_t *scratchbuf;
180 uint8_t *emu_edge_buffer;
181 }SnowContext;
182
183 /* Tables */
184 extern const uint8_t * const ff_obmc_tab[4];
185 extern uint8_t ff_qexp[QROOT];
186 extern int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
187
188 /* C bits used by mmx/sse2/altivec */
189
190 static av_always_inline void snow_interleave_line_header(int * i, int width, IDWTELEM * low, IDWTELEM * high){
191 (*i) = (width) - 2;
192
193 if (width & 1){
194 low[(*i)+1] = low[((*i)+1)>>1];
195 (*i)--;
196 }
197 }
198
199 static av_always_inline void snow_interleave_line_footer(int * i, IDWTELEM * low, IDWTELEM * high){
200 for (; (*i)>=0; (*i)-=2){
201 low[(*i)+1] = high[(*i)>>1];
202 low[*i] = low[(*i)>>1];
203 }
204 }
205
206 static av_always_inline void snow_horizontal_compose_lift_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){
207 for(; i<w; i++){
208 dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift);
209 }
210
211 if((width^lift_high)&1){
212 dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift);
213 }
214 }
215
216 static av_always_inline void snow_horizontal_compose_liftS_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w){
217 for(; i<w; i++){
218 dst[i] = src[i] + ((ref[i] + ref[(i+1)]+W_BO + 4 * src[i]) >> W_BS);
219 }
220
221 if(width&1){
222 dst[w] = src[w] + ((2 * ref[w] + W_BO + 4 * src[w]) >> W_BS);
223 }
224 }
225
226 /* common code */
227
228 int ff_snow_common_init(AVCodecContext *avctx);
229 int ff_snow_common_init_after_header(AVCodecContext *avctx);
230 void ff_snow_common_end(SnowContext *s);
231 void ff_snow_release_buffer(AVCodecContext *avctx);
232 void ff_snow_reset_contexts(SnowContext *s);
233 int ff_snow_alloc_blocks(SnowContext *s);
234 int ff_snow_frame_start(SnowContext *s);
235 void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, ptrdiff_t stride,
236 int sx, int sy, int b_w, int b_h, const BlockNode *block,
237 int plane_index, int w, int h);
238 int ff_snow_get_buffer(SnowContext *s, AVFrame *frame);
239 /* common inline functions */
240 //XXX doublecheck all of them should stay inlined
241
242 static inline void snow_set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){
243 const int w= s->b_width << s->block_max_depth;
244 const int rem_depth= s->block_max_depth - level;
245 const int index= (x + y*w) << rem_depth;
246 const int block_w= 1<<rem_depth;
247 BlockNode block;
248 int i,j;
249
250 block.color[0]= l;
251 block.color[1]= cb;
252 block.color[2]= cr;
253 block.mx= mx;
254 block.my= my;
255 block.ref= ref;
256 block.type= type;
257 block.level= level;
258
259 for(j=0; j<block_w; j++){
260 for(i=0; i<block_w; i++){
261 s->block[index + i + j*w]= block;
262 }
263 }
264 }
265
266 static inline void pred_mv(SnowContext *s, int *mx, int *my, int ref,
267 const BlockNode *left, const BlockNode *top, const BlockNode *tr){
268 if(s->ref_frames == 1){
269 *mx = mid_pred(left->mx, top->mx, tr->mx);
270 *my = mid_pred(left->my, top->my, tr->my);
271 }else{
272 const int *scale = ff_scale_mv_ref[ref];
273 *mx = mid_pred((left->mx * scale[left->ref] + 128) >>8,
274 (top ->mx * scale[top ->ref] + 128) >>8,
275 (tr ->mx * scale[tr ->ref] + 128) >>8);
276 *my = mid_pred((left->my * scale[left->ref] + 128) >>8,
277 (top ->my * scale[top ->ref] + 128) >>8,
278 (tr ->my * scale[tr ->ref] + 128) >>8);
279 }
280 }
281
282 static av_always_inline int same_block(BlockNode *a, BlockNode *b){
283 if((a->type&BLOCK_INTRA) && (b->type&BLOCK_INTRA)){
284 return !((a->color[0] - b->color[0]) | (a->color[1] - b->color[1]) | (a->color[2] - b->color[2]));
285 }else{
286 return !((a->mx - b->mx) | (a->my - b->my) | (a->ref - b->ref) | ((a->type ^ b->type)&BLOCK_INTRA));
287 }
288 }
289
290 //FIXME name cleanup (b_w, block_w, b_width stuff)
291 //XXX should we really inline it?
292 static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer *sb, IDWTELEM *dst, uint8_t *dst8, const uint8_t *obmc, int src_x, int src_y, int b_w, int b_h, int w, int h, int dst_stride, int src_stride, int obmc_stride, int b_x, int b_y, int add, int offset_dst, int plane_index){
293 const int b_width = s->b_width << s->block_max_depth;
294 const int b_height= s->b_height << s->block_max_depth;
295 const int b_stride= b_width;
296 BlockNode *lt= &s->block[b_x + b_y*b_stride];
297 BlockNode *rt= lt+1;
298 BlockNode *lb= lt+b_stride;
299 BlockNode *rb= lb+1;
300 uint8_t *block[4];
301 int tmp_step= src_stride >= 7*MB_SIZE ? MB_SIZE : MB_SIZE*src_stride;
302 uint8_t *tmp = s->scratchbuf;
303 uint8_t *ptmp;
304 int x,y;
305
306 if(b_x<0){
307 lt= rt;
308 lb= rb;
309 }else if(b_x + 1 >= b_width){
310 rt= lt;
311 rb= lb;
312 }
313 if(b_y<0){
314 lt= lb;
315 rt= rb;
316 }else if(b_y + 1 >= b_height){
317 lb= lt;
318 rb= rt;
319 }
320
321 if(src_x<0){ //FIXME merge with prev & always round internal width up to *16
322 obmc -= src_x;
323 b_w += src_x;
324 if(!sliced && !offset_dst)
325 dst -= src_x;
326 src_x=0;
327 }
328 if(src_x + b_w > w){
329 b_w = w - src_x;
330 }
331 if(src_y<0){
332 obmc -= src_y*obmc_stride;
333 b_h += src_y;
334 if(!sliced && !offset_dst)
335 dst -= src_y*dst_stride;
336 src_y=0;
337 }
338 if(src_y + b_h> h){
339 b_h = h - src_y;
340 }
341
342 if(b_w<=0 || b_h<=0) return;
343
344 av_assert2(src_stride > 2*MB_SIZE + 5);
345
346 if(!sliced && offset_dst)
347 dst += src_x + src_y*dst_stride;
348 dst8+= src_x + src_y*src_stride;
349 // src += src_x + src_y*src_stride;
350
351 ptmp= tmp + 3*tmp_step;
352 block[0]= ptmp;
353 ptmp+=tmp_step;
354 ff_snow_pred_block(s, block[0], tmp, src_stride, src_x, src_y, b_w, b_h, lt, plane_index, w, h);
355
356 if(same_block(lt, rt)){
357 block[1]= block[0];
358 }else{
359 block[1]= ptmp;
360 ptmp+=tmp_step;
361 ff_snow_pred_block(s, block[1], tmp, src_stride, src_x, src_y, b_w, b_h, rt, plane_index, w, h);
362 }
363
364 if(same_block(lt, lb)){
365 block[2]= block[0];
366 }else if(same_block(rt, lb)){
367 block[2]= block[1];
368 }else{
369 block[2]= ptmp;
370 ptmp+=tmp_step;
371 ff_snow_pred_block(s, block[2], tmp, src_stride, src_x, src_y, b_w, b_h, lb, plane_index, w, h);
372 }
373
374 if(same_block(lt, rb) ){
375 block[3]= block[0];
376 }else if(same_block(rt, rb)){
377 block[3]= block[1];
378 }else if(same_block(lb, rb)){
379 block[3]= block[2];
380 }else{
381 block[3]= ptmp;
382 ff_snow_pred_block(s, block[3], tmp, src_stride, src_x, src_y, b_w, b_h, rb, plane_index, w, h);
383 }
384 if(sliced){
385 s->dwt.inner_add_yblock(obmc, obmc_stride, block, b_w, b_h, src_x,src_y, src_stride, sb, add, dst8);
386 }else{
387 for(y=0; y<b_h; y++){
388 //FIXME ugly misuse of obmc_stride
389 const uint8_t *obmc1= obmc + y*obmc_stride;
390 const uint8_t *obmc2= obmc1+ (obmc_stride>>1);
391 const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);
392 const uint8_t *obmc4= obmc3+ (obmc_stride>>1);
393 for(x=0; x<b_w; x++){
394 int v= obmc1[x] * block[3][x + y*src_stride]
395 +obmc2[x] * block[2][x + y*src_stride]
396 +obmc3[x] * block[1][x + y*src_stride]
397 +obmc4[x] * block[0][x + y*src_stride];
398
399 v <<= 8 - LOG2_OBMC_MAX;
400 if(FRAC_BITS != 8){
401 v >>= 8 - FRAC_BITS;
402 }
403 if(add){
404 v += dst[x + y*dst_stride];
405 v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;
406 if(v&(~255)) v= ~(v>>31);
407 dst8[x + y*src_stride] = v;
408 }else{
409 dst[x + y*dst_stride] -= v;
410 }
411 }
412 }
413 }
414 }
415
416 static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int plane_index, int add, int mb_y){
417 Plane *p= &s->plane[plane_index];
418 const int mb_w= s->b_width << s->block_max_depth;
419 const int mb_h= s->b_height << s->block_max_depth;
420 int x, y, mb_x;
421 int block_size = MB_SIZE >> s->block_max_depth;
422 int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;
423 int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
424 const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
425 const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
426 int ref_stride= s->current_picture->linesize[plane_index];
427 uint8_t *dst8= s->current_picture->data[plane_index];
428 int w= p->width;
429 int h= p->height;
430 av_assert2(s->chroma_h_shift == s->chroma_v_shift); // obmc params assume squares
431 if(s->keyframe || (s->avctx->debug&512)){
432 if(mb_y==mb_h)
433 return;
434
435 if(add){
436 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
437 for(x=0; x<w; x++){
438 int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
439 v >>= FRAC_BITS;
440 if(v&(~255)) v= ~(v>>31);
441 dst8[x + y*ref_stride]= v;
442 }
443 }
444 }else{
445 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
446 for(x=0; x<w; x++){
447 buf[x + y*w]-= 128<<FRAC_BITS;
448 }
449 }
450 }
451
452 return;
453 }
454
455 for(mb_x=0; mb_x<=mb_w; mb_x++){
456 add_yblock(s, 0, NULL, buf, dst8, obmc,
457 block_w*mb_x - block_w/2,
458 block_h*mb_y - block_h/2,
459 block_w, block_h,
460 w, h,
461 w, ref_stride, obmc_stride,
462 mb_x - 1, mb_y - 1,
463 add, 1, plane_index);
464 }
465 }
466
467 static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add){
468 const int mb_h= s->b_height << s->block_max_depth;
469 int mb_y;
470 for(mb_y=0; mb_y<=mb_h; mb_y++)
471 predict_slice(s, buf, plane_index, add, mb_y);
472 }
473
474 static inline void set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){
475 const int w= s->b_width << s->block_max_depth;
476 const int rem_depth= s->block_max_depth - level;
477 const int index= (x + y*w) << rem_depth;
478 const int block_w= 1<<rem_depth;
479 const int block_h= 1<<rem_depth; //FIXME "w!=h"
480 BlockNode block;
481 int i,j;
482
483 block.color[0]= l;
484 block.color[1]= cb;
485 block.color[2]= cr;
486 block.mx= mx;
487 block.my= my;
488 block.ref= ref;
489 block.type= type;
490 block.level= level;
491
492 for(j=0; j<block_h; j++){
493 for(i=0; i<block_w; i++){
494 s->block[index + i + j*w]= block;
495 }
496 }
497 }
498
499 static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3], uint8_t *ref2[3], int x, int y, int ref_index){
500 SnowContext *s = c->avctx->priv_data;
501 const int offset[3]= {
502 y*c-> stride + x,
503 ((y*c->uvstride + x)>>s->chroma_h_shift),
504 ((y*c->uvstride + x)>>s->chroma_h_shift),
505 };
506 int i;
507 for(i=0; i<3; i++){
508 c->src[0][i]= src [i];
509 c->ref[0][i]= ref [i] + offset[i];
510 }
511 av_assert2(!ref_index);
512 }
513
514
515 /* bitstream functions */
516
517 extern const int8_t ff_quant3bA[256];
518
519 #define QEXPSHIFT (7-FRAC_BITS+8) //FIXME try to change this to 0
520
521 static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){
522 int i;
523
524 if(v){
525 const int a= FFABS(v);
526 const int e= av_log2(a);
527 const int el= FFMIN(e, 10);
528 put_rac(c, state+0, 0);
529
530 for(i=0; i<el; i++){
531 put_rac(c, state+1+i, 1); //1..10
532 }
533 for(; i<e; i++){
534 put_rac(c, state+1+9, 1); //1..10
535 }
536 put_rac(c, state+1+FFMIN(i,9), 0);
537
538 for(i=e-1; i>=el; i--){
539 put_rac(c, state+22+9, (a>>i)&1); //22..31
540 }
541 for(; i>=0; i--){
542 put_rac(c, state+22+i, (a>>i)&1); //22..31
543 }
544
545 if(is_signed)
546 put_rac(c, state+11 + el, v < 0); //11..21
547 }else{
548 put_rac(c, state+0, 1);
549 }
550 }
551
552 static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
553 if(get_rac(c, state+0))
554 return 0;
555 else{
556 int i, e, a;
557 e= 0;
558 while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
559 e++;
560 }
561
562 a= 1;
563 for(i=e-1; i>=0; i--){
564 a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31
565 }
566
567 e= -(is_signed && get_rac(c, state+11 + FFMIN(e,10))); //11..21
568 return (a^e)-e;
569 }
570 }
571
572 static inline void put_symbol2(RangeCoder *c, uint8_t *state, int v, int log2){
573 int i;
574 int r= log2>=0 ? 1<<log2 : 1;
575
576 av_assert2(v>=0);
577 av_assert2(log2>=-4);
578
579 while(v >= r){
580 put_rac(c, state+4+log2, 1);
581 v -= r;
582 log2++;
583 if(log2>0) r+=r;
584 }
585 put_rac(c, state+4+log2, 0);
586
587 for(i=log2-1; i>=0; i--){
588 put_rac(c, state+31-i, (v>>i)&1);
589 }
590 }
591
592 static inline int get_symbol2(RangeCoder *c, uint8_t *state, int log2){
593 int i;
594 int r= log2>=0 ? 1<<log2 : 1;
595 int v=0;
596
597 av_assert2(log2>=-4);
598
599 while(log2<28 && get_rac(c, state+4+log2)){
600 v+= r;
601 log2++;
602 if(log2>0) r+=r;
603 }
604
605 for(i=log2-1; i>=0; i--){
606 v+= get_rac(c, state+31-i)<<i;
607 }
608
609 return v;
610 }
611
612 static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, int orientation){
613 const int w= b->width;
614 const int h= b->height;
615 int x,y;
616
617 int run, runs;
618 x_and_coeff *xc= b->x_coeff;
619 x_and_coeff *prev_xc= NULL;
620 x_and_coeff *prev2_xc= xc;
621 x_and_coeff *parent_xc= parent ? parent->x_coeff : NULL;
622 x_and_coeff *prev_parent_xc= parent_xc;
623
624 runs= get_symbol2(&s->c, b->state[30], 0);
625 if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);
626 else run= INT_MAX;
627
628 for(y=0; y<h; y++){
629 int v=0;
630 int lt=0, t=0, rt=0;
631
632 if(y && prev_xc->x == 0){
633 rt= prev_xc->coeff;
634 }
635 for(x=0; x<w; x++){
636 int p=0;
637 const int l= v;
638
639 lt= t; t= rt;
640
641 if(y){
642 if(prev_xc->x <= x)
643 prev_xc++;
644 if(prev_xc->x == x + 1)
645 rt= prev_xc->coeff;
646 else
647 rt=0;
648 }
649 if(parent_xc){
650 if(x>>1 > parent_xc->x){
651 parent_xc++;
652 }
653 if(x>>1 == parent_xc->x){
654 p= parent_xc->coeff;
655 }
656 }
657 if(/*ll|*/l|lt|t|rt|p){
658 int context= av_log2(/*FFABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1));
659
660 v=get_rac(&s->c, &b->state[0][context]);
661 if(v){
662 v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);
663 v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l&0xFF] + 3*ff_quant3bA[t&0xFF]]);
664 if ((uint16_t)v != v) {
665 av_log(s->avctx, AV_LOG_ERROR, "Coefficient damaged\n");
666 v = 1;
667 }
668 xc->x=x;
669 (xc++)->coeff= v;
670 }
671 }else{
672 if(!run){
673 if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);
674 else run= INT_MAX;
675 v= 2*(get_symbol2(&s->c, b->state[0 + 2], 0-4) + 1);
676 v+=get_rac(&s->c, &b->state[0][16 + 1 + 3]);
677 if ((uint16_t)v != v) {
678 av_log(s->avctx, AV_LOG_ERROR, "Coefficient damaged\n");
679 v = 1;
680 }
681
682 xc->x=x;
683 (xc++)->coeff= v;
684 }else{
685 int max_run;
686 run--;
687 v=0;
688 av_assert2(run >= 0);
689 if(y) max_run= FFMIN(run, prev_xc->x - x - 2);
690 else max_run= FFMIN(run, w-x-1);
691 if(parent_xc)
692 max_run= FFMIN(max_run, 2*parent_xc->x - x - 1);
693 av_assert2(max_run >= 0 && max_run <= run);
694
695 x+= max_run;
696 run-= max_run;
697 }
698 }
699 }
700 (xc++)->x= w+1; //end marker
701 prev_xc= prev2_xc;
702 prev2_xc= xc;
703
704 if(parent_xc){
705 if(y&1){
706 while(parent_xc->x != parent->width+1)
707 parent_xc++;
708 parent_xc++;
709 prev_parent_xc= parent_xc;
710 }else{
711 parent_xc= prev_parent_xc;
712 }
713 }
714 }
715
716 (xc++)->x= w+1; //end marker
717 }
718
719 #endif /* AVCODEC_SNOW_H */