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r1009: Move the dependencies to newer package names
[cinelerra_cv/mob.git] / quicktime / ffmpeg / libavcodec / msmpeg4.c
blob3c28b8ee4f80d6ada4a5e7205d15ae37f1691f0e
1 /*
2 * MSMPEG4 backend for ffmpeg encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
21 */
22
23 /**
24 * @file msmpeg4.c
25 * MSMPEG4 backend for ffmpeg encoder and decoder.
26 */
27
28 #include "avcodec.h"
29 #include "dsputil.h"
30 #include "mpegvideo.h"
31
32 /*
33 * You can also call this codec : MPEG4 with a twist !
34 *
35 * TODO:
36 * - (encoding) select best mv table (two choices)
37 * - (encoding) select best vlc/dc table
38 */
39 //#define DEBUG
40
41 #define DC_VLC_BITS 9
42 #define CBPY_VLC_BITS 6
43 #define INTER_INTRA_VLC_BITS 3
44 #define V1_INTRA_CBPC_VLC_BITS 6
45 #define V1_INTER_CBPC_VLC_BITS 6
46 #define V2_INTRA_CBPC_VLC_BITS 3
47 #define V2_MB_TYPE_VLC_BITS 7
48 #define MV_VLC_BITS 9
49 #define V2_MV_VLC_BITS 9
50 #define TEX_VLC_BITS 9
51 #define MB_NON_INTRA_VLC_BITS 9
52 #define MB_INTRA_VLC_BITS 9
53
54 #define II_BITRATE 128*1024
55 #define MBAC_BITRATE 50*1024
56
57 #define DEFAULT_INTER_INDEX 3
58
59 static uint32_t v2_dc_lum_table[512][2];
60 static uint32_t v2_dc_chroma_table[512][2];
61
62 static inline void msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n);
63 static inline int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
64 int n, int coded, const uint8_t *scantable);
65 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
66 static int msmpeg4_decode_motion(MpegEncContext * s,
67 int *mx_ptr, int *my_ptr);
68 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val);
69 static void init_h263_dc_for_msmpeg4(void);
70 static inline void msmpeg4_memsetw(short *tab, int val, int n);
71 #ifdef CONFIG_ENCODERS
72 static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra);
73 #endif //CONFIG_ENCODERS
74 static int msmpeg4v12_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
75 static int msmpeg4v34_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
76 static int wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
77
78 /* vc9 externs */
79 extern uint8_t wmv3_dc_scale_table[32];
80
81 #ifdef DEBUG
82 int intra_count = 0;
83 int frame_count = 0;
84 #endif
85
86 #include "msmpeg4data.h"
87
88 #ifdef CONFIG_ENCODERS //strangely gcc includes this even if its not references
89 static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
90 #endif //CONFIG_ENCODERS
91
92 #ifdef STATS
93
94 const char *st_names[ST_NB] = {
95 "unknown",
96 "dc",
97 "intra_ac",
98 "inter_ac",
99 "intra_mb",
100 "inter_mb",
101 "mv",
102 };
103
104 int st_current_index = 0;
105 unsigned int st_bit_counts[ST_NB];
106 unsigned int st_out_bit_counts[ST_NB];
107
108 #define set_stat(var) st_current_index = var;
109
110 void print_stats(void)
111 {
112 unsigned int total;
113 int i;
114
115 printf("Input:\n");
116 total = 0;
117 for(i=0;i<ST_NB;i++)
118 total += st_bit_counts[i];
119 if (total == 0)
120 total = 1;
121 for(i=0;i<ST_NB;i++) {
122 printf("%-10s : %10.1f %5.1f%%\n",
123 st_names[i],
124 (double)st_bit_counts[i] / 8.0,
125 (double)st_bit_counts[i] * 100.0 / total);
126 }
127 printf("%-10s : %10.1f %5.1f%%\n",
128 "total",
129 (double)total / 8.0,
130 100.0);
131
132 printf("Output:\n");
133 total = 0;
134 for(i=0;i<ST_NB;i++)
135 total += st_out_bit_counts[i];
136 if (total == 0)
137 total = 1;
138 for(i=0;i<ST_NB;i++) {
139 printf("%-10s : %10.1f %5.1f%%\n",
140 st_names[i],
141 (double)st_out_bit_counts[i] / 8.0,
142 (double)st_out_bit_counts[i] * 100.0 / total);
143 }
144 printf("%-10s : %10.1f %5.1f%%\n",
145 "total",
146 (double)total / 8.0,
147 100.0);
148 }
149
150 #else
151
152 #define set_stat(var)
153
154 #endif
155
156 static void common_init(MpegEncContext * s)
157 {
158 static int inited=0;
159
160 switch(s->msmpeg4_version){
161 case 1:
162 case 2:
163 s->y_dc_scale_table=
164 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
165 break;
166 case 3:
167 if(s->workaround_bugs){
168 s->y_dc_scale_table= old_ff_y_dc_scale_table;
169 s->c_dc_scale_table= old_ff_c_dc_scale_table;
170 } else{
171 s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
172 s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
173 }
174 break;
175 case 4:
176 case 5:
177 s->y_dc_scale_table= wmv1_y_dc_scale_table;
178 s->c_dc_scale_table= wmv1_c_dc_scale_table;
179 break;
180 #if defined(CONFIG_WMV3_DECODER)||defined(CONFIG_VC9_DECODER)
181 case 6:
182 s->y_dc_scale_table= wmv3_dc_scale_table;
183 s->c_dc_scale_table= wmv3_dc_scale_table;
184 break;
185 #endif
186
187 }
188
189
190 if(s->msmpeg4_version>=4){
191 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , wmv1_scantable[1]);
192 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, wmv1_scantable[2]);
193 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, wmv1_scantable[3]);
194 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , wmv1_scantable[0]);
195 }
196 //Note the default tables are set in common_init in mpegvideo.c
197
198 if(!inited){
199 inited=1;
200
201 init_h263_dc_for_msmpeg4();
202 }
203 }
204
205 #ifdef CONFIG_ENCODERS
206
207 /* build the table which associate a (x,y) motion vector to a vlc */
208 static void init_mv_table(MVTable *tab)
209 {
210 int i, x, y;
211
212 tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096);
213 /* mark all entries as not used */
214 for(i=0;i<4096;i++)
215 tab->table_mv_index[i] = tab->n;
216
217 for(i=0;i<tab->n;i++) {
218 x = tab->table_mvx[i];
219 y = tab->table_mvy[i];
220 tab->table_mv_index[(x << 6) | y] = i;
221 }
222 }
223
224 static void code012(PutBitContext *pb, int n)
225 {
226 if (n == 0) {
227 put_bits(pb, 1, 0);
228 } else {
229 put_bits(pb, 1, 1);
230 put_bits(pb, 1, (n >= 2));
231 }
232 }
233
234 void ff_msmpeg4_encode_init(MpegEncContext *s)
235 {
236 static int init_done=0;
237 int i;
238
239 common_init(s);
240 if(s->msmpeg4_version>=4){
241 s->min_qcoeff= -255;
242 s->max_qcoeff= 255;
243 }
244
245 if (!init_done) {
246 /* init various encoding tables */
247 init_done = 1;
248 init_mv_table(&mv_tables[0]);
249 init_mv_table(&mv_tables[1]);
250 for(i=0;i<NB_RL_TABLES;i++)
251 init_rl(&rl_table[i], 1);
252
253 for(i=0; i<NB_RL_TABLES; i++){
254 int level;
255 for(level=0; level<=MAX_LEVEL; level++){
256 int run;
257 for(run=0; run<=MAX_RUN; run++){
258 int last;
259 for(last=0; last<2; last++){
260 rl_length[i][level][run][last]= get_size_of_code(s, &rl_table[ i], last, run, level, 0);
261 }
262 }
263 }
264 }
265 }
266 }
267
268 static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){
269 int size=0;
270 int code;
271 int run_diff= intra ? 0 : 1;
272
273 code = get_rl_index(rl, last, run, level);
274 size+= rl->table_vlc[code][1];
275 if (code == rl->n) {
276 int level1, run1;
277
278 level1 = level - rl->max_level[last][run];
279 if (level1 < 1)
280 goto esc2;
281 code = get_rl_index(rl, last, run, level1);
282 if (code == rl->n) {
283 esc2:
284 size++;
285 if (level > MAX_LEVEL)
286 goto esc3;
287 run1 = run - rl->max_run[last][level] - run_diff;
288 if (run1 < 0)
289 goto esc3;
290 code = get_rl_index(rl, last, run1, level);
291 if (code == rl->n) {
292 esc3:
293 /* third escape */
294 size+=1+1+6+8;
295 } else {
296 /* second escape */
297 size+= 1+1+ rl->table_vlc[code][1];
298 }
299 } else {
300 /* first escape */
301 size+= 1+1+ rl->table_vlc[code][1];
302 }
303 } else {
304 size++;
305 }
306 return size;
307 }
308
309 static void find_best_tables(MpegEncContext * s)
310 {
311 int i;
312 int best =-1, best_size =9999999;
313 int chroma_best=-1, best_chroma_size=9999999;
314
315 for(i=0; i<3; i++){
316 int level;
317 int chroma_size=0;
318 int size=0;
319
320 if(i>0){// ;)
321 size++;
322 chroma_size++;
323 }
324 for(level=0; level<=MAX_LEVEL; level++){
325 int run;
326 for(run=0; run<=MAX_RUN; run++){
327 int last;
328 const int last_size= size + chroma_size;
329 for(last=0; last<2; last++){
330 int inter_count = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last];
331 int intra_luma_count = s->ac_stats[1][0][level][run][last];
332 int intra_chroma_count= s->ac_stats[1][1][level][run][last];
333
334 if(s->pict_type==I_TYPE){
335 size += intra_luma_count *rl_length[i ][level][run][last];
336 chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last];
337 }else{
338 size+= intra_luma_count *rl_length[i ][level][run][last]
339 +intra_chroma_count*rl_length[i+3][level][run][last]
340 +inter_count *rl_length[i+3][level][run][last];
341 }
342 }
343 if(last_size == size+chroma_size) break;
344 }
345 }
346 if(size<best_size){
347 best_size= size;
348 best= i;
349 }
350 if(chroma_size<best_chroma_size){
351 best_chroma_size= chroma_size;
352 chroma_best= i;
353 }
354 }
355
356 // printf("type:%d, best:%d, qp:%d, var:%d, mcvar:%d, size:%d //\n",
357 // s->pict_type, best, s->qscale, s->mb_var_sum, s->mc_mb_var_sum, best_size);
358
359 if(s->pict_type==P_TYPE) chroma_best= best;
360
361 memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
362
363 s->rl_table_index = best;
364 s->rl_chroma_table_index= chroma_best;
365
366 if(s->pict_type != s->last_non_b_pict_type){
367 s->rl_table_index= 2;
368 if(s->pict_type==I_TYPE)
369 s->rl_chroma_table_index= 1;
370 else
371 s->rl_chroma_table_index= 2;
372 }
373
374 }
375
376 /* write MSMPEG4 compatible frame header */
377 void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
378 {
379 find_best_tables(s);
380
381 align_put_bits(&s->pb);
382 put_bits(&s->pb, 2, s->pict_type - 1);
383
384 put_bits(&s->pb, 5, s->qscale);
385 if(s->msmpeg4_version<=2){
386 s->rl_table_index = 2;
387 s->rl_chroma_table_index = 2;
388 }
389
390 s->dc_table_index = 1;
391 s->mv_table_index = 1; /* only if P frame */
392 s->use_skip_mb_code = 1; /* only if P frame */
393 s->per_mb_rl_table = 0;
394 if(s->msmpeg4_version==4)
395 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==P_TYPE);
396 //printf("%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height);
397
398 if (s->pict_type == I_TYPE) {
399 s->slice_height= s->mb_height/1;
400 put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
401
402 if(s->msmpeg4_version==4){
403 msmpeg4_encode_ext_header(s);
404 if(s->bit_rate>MBAC_BITRATE)
405 put_bits(&s->pb, 1, s->per_mb_rl_table);
406 }
407
408 if(s->msmpeg4_version>2){
409 if(!s->per_mb_rl_table){
410 code012(&s->pb, s->rl_chroma_table_index);
411 code012(&s->pb, s->rl_table_index);
412 }
413
414 put_bits(&s->pb, 1, s->dc_table_index);
415 }
416 } else {
417 put_bits(&s->pb, 1, s->use_skip_mb_code);
418
419 if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
420 put_bits(&s->pb, 1, s->per_mb_rl_table);
421
422 if(s->msmpeg4_version>2){
423 if(!s->per_mb_rl_table)
424 code012(&s->pb, s->rl_table_index);
425
426 put_bits(&s->pb, 1, s->dc_table_index);
427
428 put_bits(&s->pb, 1, s->mv_table_index);
429 }
430 }
431
432 s->esc3_level_length= 0;
433 s->esc3_run_length= 0;
434
435 #ifdef DEBUG
436 intra_count = 0;
437 printf("*****frame %d:\n", frame_count++);
438 #endif
439 }
440
441 void msmpeg4_encode_ext_header(MpegEncContext * s)
442 {
443 put_bits(&s->pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
444
445 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
446
447 if(s->msmpeg4_version>=3)
448 put_bits(&s->pb, 1, s->flipflop_rounding);
449 else
450 assert(s->flipflop_rounding==0);
451 }
452
453 #endif //CONFIG_ENCODERS
454
455 /* predict coded block */
456 static inline int coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)
457 {
458 int xy, wrap, pred, a, b, c;
459
460 xy = s->block_index[n];
461 wrap = s->b8_stride;
462
463 /* B C
464 * A X
465 */
466 a = s->coded_block[xy - 1 ];
467 b = s->coded_block[xy - 1 - wrap];
468 c = s->coded_block[xy - wrap];
469
470 if (b == c) {
471 pred = a;
472 } else {
473 pred = c;
474 }
475
476 /* store value */
477 *coded_block_ptr = &s->coded_block[xy];
478
479 return pred;
480 }
481
482 #ifdef CONFIG_ENCODERS
483
484 static void msmpeg4_encode_motion(MpegEncContext * s,
485 int mx, int my)
486 {
487 int code;
488 MVTable *mv;
489
490 /* modulo encoding */
491 /* WARNING : you cannot reach all the MVs even with the modulo
492 encoding. This is a somewhat strange compromise they took !!! */
493 if (mx <= -64)
494 mx += 64;
495 else if (mx >= 64)
496 mx -= 64;
497 if (my <= -64)
498 my += 64;
499 else if (my >= 64)
500 my -= 64;
501
502 mx += 32;
503 my += 32;
504 #if 0
505 if ((unsigned)mx >= 64 ||
506 (unsigned)my >= 64)
507 fprintf(stderr, "error mx=%d my=%d\n", mx, my);
508 #endif
509 mv = &mv_tables[s->mv_table_index];
510
511 code = mv->table_mv_index[(mx << 6) | my];
512 set_stat(ST_MV);
513 put_bits(&s->pb,
514 mv->table_mv_bits[code],
515 mv->table_mv_code[code]);
516 if (code == mv->n) {
517 /* escape : code litterally */
518 put_bits(&s->pb, 6, mx);
519 put_bits(&s->pb, 6, my);
520 }
521 }
522
523 static inline void handle_slices(MpegEncContext *s){
524 if (s->mb_x == 0) {
525 if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
526 if(s->msmpeg4_version < 4){
527 ff_mpeg4_clean_buffers(s);
528 }
529 s->first_slice_line = 1;
530 } else {
531 s->first_slice_line = 0;
532 }
533 }
534 }
535
536 void msmpeg4_encode_mb(MpegEncContext * s,
537 DCTELEM block[6][64],
538 int motion_x, int motion_y)
539 {
540 int cbp, coded_cbp, i;
541 int pred_x, pred_y;
542 uint8_t *coded_block;
543
544 handle_slices(s);
545
546 if (!s->mb_intra) {
547 /* compute cbp */
548 set_stat(ST_INTER_MB);
549 cbp = 0;
550 for (i = 0; i < 6; i++) {
551 if (s->block_last_index[i] >= 0)
552 cbp |= 1 << (5 - i);
553 }
554 if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
555 /* skip macroblock */
556 put_bits(&s->pb, 1, 1);
557 s->last_bits++;
558 s->misc_bits++;
559 s->skip_count++;
560
561 return;
562 }
563 if (s->use_skip_mb_code)
564 put_bits(&s->pb, 1, 0); /* mb coded */
565
566 if(s->msmpeg4_version<=2){
567 put_bits(&s->pb,
568 v2_mb_type[cbp&3][1],
569 v2_mb_type[cbp&3][0]);
570 if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
571 else coded_cbp= cbp;
572
573 put_bits(&s->pb,
574 cbpy_tab[coded_cbp>>2][1],
575 cbpy_tab[coded_cbp>>2][0]);
576
577 s->misc_bits += get_bits_diff(s);
578
579 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
580 msmpeg4v2_encode_motion(s, motion_x - pred_x);
581 msmpeg4v2_encode_motion(s, motion_y - pred_y);
582 }else{
583 put_bits(&s->pb,
584 table_mb_non_intra[cbp + 64][1],
585 table_mb_non_intra[cbp + 64][0]);
586
587 s->misc_bits += get_bits_diff(s);
588
589 /* motion vector */
590 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
591 msmpeg4_encode_motion(s, motion_x - pred_x,
592 motion_y - pred_y);
593 }
594
595 s->mv_bits += get_bits_diff(s);
596
597 for (i = 0; i < 6; i++) {
598 msmpeg4_encode_block(s, block[i], i);
599 }
600 s->p_tex_bits += get_bits_diff(s);
601 } else {
602 /* compute cbp */
603 cbp = 0;
604 coded_cbp = 0;
605 for (i = 0; i < 6; i++) {
606 int val, pred;
607 val = (s->block_last_index[i] >= 1);
608 cbp |= val << (5 - i);
609 if (i < 4) {
610 /* predict value for close blocks only for luma */
611 pred = coded_block_pred(s, i, &coded_block);
612 *coded_block = val;
613 val = val ^ pred;
614 }
615 coded_cbp |= val << (5 - i);
616 }
617 #if 0
618 if (coded_cbp)
619 printf("cbp=%x %x\n", cbp, coded_cbp);
620 #endif
621
622 if(s->msmpeg4_version<=2){
623 if (s->pict_type == I_TYPE) {
624 put_bits(&s->pb,
625 v2_intra_cbpc[cbp&3][1], v2_intra_cbpc[cbp&3][0]);
626 } else {
627 if (s->use_skip_mb_code)
628 put_bits(&s->pb, 1, 0); /* mb coded */
629 put_bits(&s->pb,
630 v2_mb_type[(cbp&3) + 4][1],
631 v2_mb_type[(cbp&3) + 4][0]);
632 }
633 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
634 put_bits(&s->pb,
635 cbpy_tab[cbp>>2][1],
636 cbpy_tab[cbp>>2][0]);
637 }else{
638 if (s->pict_type == I_TYPE) {
639 set_stat(ST_INTRA_MB);
640 put_bits(&s->pb,
641 ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
642 } else {
643 if (s->use_skip_mb_code)
644 put_bits(&s->pb, 1, 0); /* mb coded */
645 put_bits(&s->pb,
646 table_mb_non_intra[cbp][1],
647 table_mb_non_intra[cbp][0]);
648 }
649 set_stat(ST_INTRA_MB);
650 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
651 if(s->inter_intra_pred){
652 s->h263_aic_dir=0;
653 put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
654 }
655 }
656 s->misc_bits += get_bits_diff(s);
657
658 for (i = 0; i < 6; i++) {
659 msmpeg4_encode_block(s, block[i], i);
660 }
661 s->i_tex_bits += get_bits_diff(s);
662 s->i_count++;
663 }
664 }
665
666 #endif //CONFIG_ENCODERS
667
668 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
669 int32_t **dc_val_ptr)
670 {
671 int i;
672
673 if (n < 4) {
674 i= 0;
675 } else {
676 i= n-3;
677 }
678
679 *dc_val_ptr= &s->last_dc[i];
680 return s->last_dc[i];
681 }
682
683 static int get_dc(uint8_t *src, int stride, int scale)
684 {
685 int y;
686 int sum=0;
687 for(y=0; y<8; y++){
688 int x;
689 for(x=0; x<8; x++){
690 sum+=src[x + y*stride];
691 }
692 }
693 return FASTDIV((sum + (scale>>1)), scale);
694 }
695
696 /* dir = 0: left, dir = 1: top prediction */
697 static inline int msmpeg4_pred_dc(MpegEncContext * s, int n,
698 uint16_t **dc_val_ptr, int *dir_ptr)
699 {
700 int a, b, c, wrap, pred, scale;
701 int16_t *dc_val;
702
703 /* find prediction */
704 if (n < 4) {
705 scale = s->y_dc_scale;
706 } else {
707 scale = s->c_dc_scale;
708 }
709
710 wrap = s->block_wrap[n];
711 dc_val= s->dc_val[0] + s->block_index[n];
712
713 /* B C
714 * A X
715 */
716 a = dc_val[ - 1];
717 b = dc_val[ - 1 - wrap];
718 c = dc_val[ - wrap];
719
720 if(s->first_slice_line && (n&2)==0 && s->msmpeg4_version<4){
721 b=c=1024;
722 }
723
724 /* XXX: the following solution consumes divisions, but it does not
725 necessitate to modify mpegvideo.c. The problem comes from the
726 fact they decided to store the quantized DC (which would lead
727 to problems if Q could vary !) */
728 #if (defined(ARCH_X86) || defined(ARCH_X86_64)) && !defined PIC
729 asm volatile(
730 "movl %3, %%eax \n\t"
731 "shrl $1, %%eax \n\t"
732 "addl %%eax, %2 \n\t"
733 "addl %%eax, %1 \n\t"
734 "addl %0, %%eax \n\t"
735 "mull %4 \n\t"
736 "movl %%edx, %0 \n\t"
737 "movl %1, %%eax \n\t"
738 "mull %4 \n\t"
739 "movl %%edx, %1 \n\t"
740 "movl %2, %%eax \n\t"
741 "mull %4 \n\t"
742 "movl %%edx, %2 \n\t"
743 : "+b" (a), "+c" (b), "+D" (c)
744 : "g" (scale), "S" (inverse[scale])
745 : "%eax", "%edx"
746 );
747 #else
748 /* #elif defined (ARCH_ALPHA) */
749 /* Divisions are extremely costly on Alpha; optimize the most
750 common case. But they are costly everywhere...
751 */
752 if (scale == 8) {
753 a = (a + (8 >> 1)) / 8;
754 b = (b + (8 >> 1)) / 8;
755 c = (c + (8 >> 1)) / 8;
756 } else {
757 a = FASTDIV((a + (scale >> 1)), scale);
758 b = FASTDIV((b + (scale >> 1)), scale);
759 c = FASTDIV((c + (scale >> 1)), scale);
760 }
761 #endif
762 /* XXX: WARNING: they did not choose the same test as MPEG4. This
763 is very important ! */
764 if(s->msmpeg4_version>3){
765 if(s->inter_intra_pred){
766 uint8_t *dest;
767 int wrap;
768
769 if(n==1){
770 pred=a;
771 *dir_ptr = 0;
772 }else if(n==2){
773 pred=c;
774 *dir_ptr = 1;
775 }else if(n==3){
776 if (abs(a - b) < abs(b - c)) {
777 pred = c;
778 *dir_ptr = 1;
779 } else {
780 pred = a;
781 *dir_ptr = 0;
782 }
783 }else{
784 if(n<4){
785 wrap= s->linesize;
786 dest= s->current_picture.data[0] + (((n>>1) + 2*s->mb_y) * 8* wrap ) + ((n&1) + 2*s->mb_x) * 8;
787 }else{
788 wrap= s->uvlinesize;
789 dest= s->current_picture.data[n-3] + (s->mb_y * 8 * wrap) + s->mb_x * 8;
790 }
791 if(s->mb_x==0) a= (1024 + (scale>>1))/scale;
792 else a= get_dc(dest-8, wrap, scale*8);
793 if(s->mb_y==0) c= (1024 + (scale>>1))/scale;
794 else c= get_dc(dest-8*wrap, wrap, scale*8);
795
796 if (s->h263_aic_dir==0) {
797 pred= a;
798 *dir_ptr = 0;
799 }else if (s->h263_aic_dir==1) {
800 if(n==0){
801 pred= c;
802 *dir_ptr = 1;
803 }else{
804 pred= a;
805 *dir_ptr = 0;
806 }
807 }else if (s->h263_aic_dir==2) {
808 if(n==0){
809 pred= a;
810 *dir_ptr = 0;
811 }else{
812 pred= c;
813 *dir_ptr = 1;
814 }
815 } else {
816 pred= c;
817 *dir_ptr = 1;
818 }
819 }
820 }else{
821 if (abs(a - b) < abs(b - c)) {
822 pred = c;
823 *dir_ptr = 1;
824 } else {
825 pred = a;
826 *dir_ptr = 0;
827 }
828 }
829 }else{
830 if (abs(a - b) <= abs(b - c)) {
831 pred = c;
832 *dir_ptr = 1;
833 } else {
834 pred = a;
835 *dir_ptr = 0;
836 }
837 }
838
839 /* update predictor */
840 *dc_val_ptr = &dc_val[0];
841 return pred;
842 }
843
844 #define DC_MAX 119
845
846 static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
847 {
848 int sign, code;
849 int pred;
850
851 if(s->msmpeg4_version==1){
852 int32_t *dc_val;
853 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
854
855 /* update predictor */
856 *dc_val= level;
857 }else{
858 uint16_t *dc_val;
859 pred = msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
860
861 /* update predictor */
862 if (n < 4) {
863 *dc_val = level * s->y_dc_scale;
864 } else {
865 *dc_val = level * s->c_dc_scale;
866 }
867 }
868
869 /* do the prediction */
870 level -= pred;
871
872 if(s->msmpeg4_version<=2){
873 if (n < 4) {
874 put_bits(&s->pb,
875 v2_dc_lum_table[level+256][1],
876 v2_dc_lum_table[level+256][0]);
877 }else{
878 put_bits(&s->pb,
879 v2_dc_chroma_table[level+256][1],
880 v2_dc_chroma_table[level+256][0]);
881 }
882 }else{
883 sign = 0;
884 if (level < 0) {
885 level = -level;
886 sign = 1;
887 }
888 code = level;
889 if (code > DC_MAX)
890 code = DC_MAX;
891
892 if (s->dc_table_index == 0) {
893 if (n < 4) {
894 put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
895 } else {
896 put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
897 }
898 } else {
899 if (n < 4) {
900 put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
901 } else {
902 put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
903 }
904 }
905
906 if (code == DC_MAX)
907 put_bits(&s->pb, 8, level);
908
909 if (level != 0) {
910 put_bits(&s->pb, 1, sign);
911 }
912 }
913 }
914
915 /* Encoding of a block. Very similar to MPEG4 except for a different
916 escape coding (same as H263) and more vlc tables.
917 */
918 static inline void msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
919 {
920 int level, run, last, i, j, last_index;
921 int last_non_zero, sign, slevel;
922 int code, run_diff, dc_pred_dir;
923 const RLTable *rl;
924 const uint8_t *scantable;
925
926 if (s->mb_intra) {
927 set_stat(ST_DC);
928 msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
929 i = 1;
930 if (n < 4) {
931 rl = &rl_table[s->rl_table_index];
932 } else {
933 rl = &rl_table[3 + s->rl_chroma_table_index];
934 }
935 run_diff = 0;
936 scantable= s->intra_scantable.permutated;
937 set_stat(ST_INTRA_AC);
938 } else {
939 i = 0;
940 rl = &rl_table[3 + s->rl_table_index];
941 if(s->msmpeg4_version<=2)
942 run_diff = 0;
943 else
944 run_diff = 1;
945 scantable= s->inter_scantable.permutated;
946 set_stat(ST_INTER_AC);
947 }
948
949 /* recalculate block_last_index for M$ wmv1 */
950 if(s->msmpeg4_version>=4 && s->block_last_index[n]>0){
951 for(last_index=63; last_index>=0; last_index--){
952 if(block[scantable[last_index]]) break;
953 }
954 s->block_last_index[n]= last_index;
955 }else
956 last_index = s->block_last_index[n];
957 /* AC coefs */
958 last_non_zero = i - 1;
959 for (; i <= last_index; i++) {
960 j = scantable[i];
961 level = block[j];
962 if (level) {
963 run = i - last_non_zero - 1;
964 last = (i == last_index);
965 sign = 0;
966 slevel = level;
967 if (level < 0) {
968 sign = 1;
969 level = -level;
970 }
971
972 if(level<=MAX_LEVEL && run<=MAX_RUN){
973 s->ac_stats[s->mb_intra][n>3][level][run][last]++;
974 }
975 #if 0
976 else
977 s->ac_stats[s->mb_intra][n>3][40][63][0]++; //esc3 like
978 #endif
979 code = get_rl_index(rl, last, run, level);
980 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
981 if (code == rl->n) {
982 int level1, run1;
983
984 level1 = level - rl->max_level[last][run];
985 if (level1 < 1)
986 goto esc2;
987 code = get_rl_index(rl, last, run, level1);
988 if (code == rl->n) {
989 esc2:
990 put_bits(&s->pb, 1, 0);
991 if (level > MAX_LEVEL)
992 goto esc3;
993 run1 = run - rl->max_run[last][level] - run_diff;
994 if (run1 < 0)
995 goto esc3;
996 code = get_rl_index(rl, last, run1, level);
997 if (code == rl->n) {
998 esc3:
999 /* third escape */
1000 put_bits(&s->pb, 1, 0);
1001 put_bits(&s->pb, 1, last);
1002 if(s->msmpeg4_version>=4){
1003 if(s->esc3_level_length==0){
1004 s->esc3_level_length=8;
1005 s->esc3_run_length= 6;
1006 if(s->qscale<8)
1007 put_bits(&s->pb, 6, 3);
1008 else
1009 put_bits(&s->pb, 8, 3);
1010 }
1011 put_bits(&s->pb, s->esc3_run_length, run);
1012 put_bits(&s->pb, 1, sign);
1013 put_bits(&s->pb, s->esc3_level_length, level);
1014 }else{
1015 put_bits(&s->pb, 6, run);
1016 put_bits(&s->pb, 8, slevel & 0xff);
1017 }
1018 } else {
1019 /* second escape */
1020 put_bits(&s->pb, 1, 1);
1021 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
1022 put_bits(&s->pb, 1, sign);
1023 }
1024 } else {
1025 /* first escape */
1026 put_bits(&s->pb, 1, 1);
1027 put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
1028 put_bits(&s->pb, 1, sign);
1029 }
1030 } else {
1031 put_bits(&s->pb, 1, sign);
1032 }
1033 last_non_zero = i;
1034 }
1035 }
1036 }
1037
1038 /****************************************/
1039 /* decoding stuff */
1040
1041 static VLC mb_non_intra_vlc[4];
1042 VLC ff_msmp4_mb_i_vlc;
1043 VLC ff_msmp4_dc_luma_vlc[2];
1044 VLC ff_msmp4_dc_chroma_vlc[2];
1045 static VLC v2_dc_lum_vlc;
1046 static VLC v2_dc_chroma_vlc;
1047 static VLC cbpy_vlc;
1048 static VLC v2_intra_cbpc_vlc;
1049 static VLC v2_mb_type_vlc;
1050 static VLC v2_mv_vlc;
1051 static VLC v1_intra_cbpc_vlc;
1052 static VLC v1_inter_cbpc_vlc;
1053 static VLC inter_intra_vlc;
1054
1055 /* this table is practically identical to the one from h263 except that its inverted */
1056 static void init_h263_dc_for_msmpeg4(void)
1057 {
1058 int level, uni_code, uni_len;
1059
1060 for(level=-256; level<256; level++){
1061 int size, v, l;
1062 /* find number of bits */
1063 size = 0;
1064 v = abs(level);
1065 while (v) {
1066 v >>= 1;
1067 size++;
1068 }
1069
1070 if (level < 0)
1071 l= (-level) ^ ((1 << size) - 1);
1072 else
1073 l= level;
1074
1075 /* luminance h263 */
1076 uni_code= DCtab_lum[size][0];
1077 uni_len = DCtab_lum[size][1];
1078 uni_code ^= (1<<uni_len)-1; //M$ doesnt like compatibility
1079
1080 if (size > 0) {
1081 uni_code<<=size; uni_code|=l;
1082 uni_len+=size;
1083 if (size > 8){
1084 uni_code<<=1; uni_code|=1;
1085 uni_len++;
1086 }
1087 }
1088 v2_dc_lum_table[level+256][0]= uni_code;
1089 v2_dc_lum_table[level+256][1]= uni_len;
1090
1091 /* chrominance h263 */
1092 uni_code= DCtab_chrom[size][0];
1093 uni_len = DCtab_chrom[size][1];
1094 uni_code ^= (1<<uni_len)-1; //M$ doesnt like compatibility
1095
1096 if (size > 0) {
1097 uni_code<<=size; uni_code|=l;
1098 uni_len+=size;
1099 if (size > 8){
1100 uni_code<<=1; uni_code|=1;
1101 uni_len++;
1102 }
1103 }
1104 v2_dc_chroma_table[level+256][0]= uni_code;
1105 v2_dc_chroma_table[level+256][1]= uni_len;
1106
1107 }
1108 }
1109
1110 /* init all vlc decoding tables */
1111 int ff_msmpeg4_decode_init(MpegEncContext *s)
1112 {
1113 static int done = 0;
1114 int i;
1115 MVTable *mv;
1116
1117 common_init(s);
1118
1119 if (!done) {
1120 done = 1;
1121
1122 for(i=0;i<NB_RL_TABLES;i++) {
1123 init_rl(&rl_table[i], 1);
1124 init_vlc_rl(&rl_table[i], 1);
1125 }
1126 for(i=0;i<2;i++) {
1127 mv = &mv_tables[i];
1128 init_vlc(&mv->vlc, MV_VLC_BITS, mv->n + 1,
1129 mv->table_mv_bits, 1, 1,
1130 mv->table_mv_code, 2, 2, 1);
1131 }
1132
1133 init_vlc(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
1134 &ff_table0_dc_lum[0][1], 8, 4,
1135 &ff_table0_dc_lum[0][0], 8, 4, 1);
1136 init_vlc(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
1137 &ff_table0_dc_chroma[0][1], 8, 4,
1138 &ff_table0_dc_chroma[0][0], 8, 4, 1);
1139 init_vlc(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
1140 &ff_table1_dc_lum[0][1], 8, 4,
1141 &ff_table1_dc_lum[0][0], 8, 4, 1);
1142 init_vlc(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
1143 &ff_table1_dc_chroma[0][1], 8, 4,
1144 &ff_table1_dc_chroma[0][0], 8, 4, 1);
1145
1146 init_vlc(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
1147 &v2_dc_lum_table[0][1], 8, 4,
1148 &v2_dc_lum_table[0][0], 8, 4, 1);
1149 init_vlc(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
1150 &v2_dc_chroma_table[0][1], 8, 4,
1151 &v2_dc_chroma_table[0][0], 8, 4, 1);
1152
1153 init_vlc(&cbpy_vlc, CBPY_VLC_BITS, 16,
1154 &cbpy_tab[0][1], 2, 1,
1155 &cbpy_tab[0][0], 2, 1, 1);
1156 init_vlc(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
1157 &v2_intra_cbpc[0][1], 2, 1,
1158 &v2_intra_cbpc[0][0], 2, 1, 1);
1159 init_vlc(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
1160 &v2_mb_type[0][1], 2, 1,
1161 &v2_mb_type[0][0], 2, 1, 1);
1162 init_vlc(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
1163 &mvtab[0][1], 2, 1,
1164 &mvtab[0][0], 2, 1, 1);
1165
1166 for(i=0; i<4; i++){
1167 init_vlc(&mb_non_intra_vlc[i], MB_NON_INTRA_VLC_BITS, 128,
1168 &wmv2_inter_table[i][0][1], 8, 4,
1169 &wmv2_inter_table[i][0][0], 8, 4, 1); //FIXME name?
1170 }
1171
1172 init_vlc(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
1173 &ff_msmp4_mb_i_table[0][1], 4, 2,
1174 &ff_msmp4_mb_i_table[0][0], 4, 2, 1);
1175
1176 init_vlc(&v1_intra_cbpc_vlc, V1_INTRA_CBPC_VLC_BITS, 8,
1177 intra_MCBPC_bits, 1, 1,
1178 intra_MCBPC_code, 1, 1, 1);
1179 init_vlc(&v1_inter_cbpc_vlc, V1_INTER_CBPC_VLC_BITS, 25,
1180 inter_MCBPC_bits, 1, 1,
1181 inter_MCBPC_code, 1, 1, 1);
1182
1183 init_vlc(&inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
1184 &table_inter_intra[0][1], 2, 1,
1185 &table_inter_intra[0][0], 2, 1, 1);
1186 }
1187
1188 switch(s->msmpeg4_version){
1189 case 1:
1190 case 2:
1191 s->decode_mb= msmpeg4v12_decode_mb;
1192 break;
1193 case 3:
1194 case 4:
1195 s->decode_mb= msmpeg4v34_decode_mb;
1196 break;
1197 case 5:
1198 s->decode_mb= wmv2_decode_mb;
1199 case 6:
1200 //FIXME + TODO VC9 decode mb
1201 break;
1202 }
1203
1204 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame isnt a keyframe
1205
1206 return 0;
1207 }
1208
1209 int msmpeg4_decode_picture_header(MpegEncContext * s)
1210 {
1211 int code;
1212
1213 #if 0
1214 {
1215 int i;
1216 for(i=0; i<s->gb.size_in_bits; i++)
1217 printf("%d", get_bits1(&s->gb));
1218 // get_bits1(&s->gb);
1219 printf("END\n");
1220 return -1;
1221 }
1222 #endif
1223
1224 if(s->msmpeg4_version==1){
1225 int start_code, num;
1226 start_code = (get_bits(&s->gb, 16)<<16) | get_bits(&s->gb, 16);
1227 if(start_code!=0x00000100){
1228 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
1229 return -1;
1230 }
1231
1232 num= get_bits(&s->gb, 5); // frame number */
1233 }
1234
1235 s->pict_type = get_bits(&s->gb, 2) + 1;
1236 if (s->pict_type != I_TYPE &&
1237 s->pict_type != P_TYPE){
1238 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
1239 return -1;
1240 }
1241 #if 0
1242 {
1243 static int had_i=0;
1244 if(s->pict_type == I_TYPE) had_i=1;
1245 if(!had_i) return -1;
1246 }
1247 #endif
1248 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1249 if(s->qscale==0){
1250 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
1251 return -1;
1252 }
1253
1254 if (s->pict_type == I_TYPE) {
1255 code = get_bits(&s->gb, 5);
1256 if(s->msmpeg4_version==1){
1257 if(code==0 || code>s->mb_height){
1258 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
1259 return -1;
1260 }
1261
1262 s->slice_height = code;
1263 }else{
1264 /* 0x17: one slice, 0x18: two slices, ... */
1265 if (code < 0x17){
1266 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
1267 return -1;
1268 }
1269
1270 s->slice_height = s->mb_height / (code - 0x16);
1271 }
1272
1273 switch(s->msmpeg4_version){
1274 case 1:
1275 case 2:
1276 s->rl_chroma_table_index = 2;
1277 s->rl_table_index = 2;
1278
1279 s->dc_table_index = 0; //not used
1280 break;
1281 case 3:
1282 s->rl_chroma_table_index = decode012(&s->gb);
1283 s->rl_table_index = decode012(&s->gb);
1284
1285 s->dc_table_index = get_bits1(&s->gb);
1286 break;
1287 case 4:
1288 msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
1289
1290 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
1291 else s->per_mb_rl_table= 0;
1292
1293 if(!s->per_mb_rl_table){
1294 s->rl_chroma_table_index = decode012(&s->gb);
1295 s->rl_table_index = decode012(&s->gb);
1296 }
1297
1298 s->dc_table_index = get_bits1(&s->gb);
1299 s->inter_intra_pred= 0;
1300 break;
1301 }
1302 s->no_rounding = 1;
1303 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1304 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
1305 s->qscale,
1306 s->rl_chroma_table_index,
1307 s->rl_table_index,
1308 s->dc_table_index,
1309 s->per_mb_rl_table,
1310 s->slice_height);
1311 } else {
1312 switch(s->msmpeg4_version){
1313 case 1:
1314 case 2:
1315 if(s->msmpeg4_version==1)
1316 s->use_skip_mb_code = 1;
1317 else
1318 s->use_skip_mb_code = get_bits1(&s->gb);
1319 s->rl_table_index = 2;
1320 s->rl_chroma_table_index = s->rl_table_index;
1321 s->dc_table_index = 0; //not used
1322 s->mv_table_index = 0;
1323 break;
1324 case 3:
1325 s->use_skip_mb_code = get_bits1(&s->gb);
1326 s->rl_table_index = decode012(&s->gb);
1327 s->rl_chroma_table_index = s->rl_table_index;
1328
1329 s->dc_table_index = get_bits1(&s->gb);
1330
1331 s->mv_table_index = get_bits1(&s->gb);
1332 break;
1333 case 4:
1334 s->use_skip_mb_code = get_bits1(&s->gb);
1335
1336 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
1337 else s->per_mb_rl_table= 0;
1338
1339 if(!s->per_mb_rl_table){
1340 s->rl_table_index = decode012(&s->gb);
1341 s->rl_chroma_table_index = s->rl_table_index;
1342 }
1343
1344 s->dc_table_index = get_bits1(&s->gb);
1345
1346 s->mv_table_index = get_bits1(&s->gb);
1347 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
1348 break;
1349 }
1350
1351 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
1352 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
1353 s->use_skip_mb_code,
1354 s->rl_table_index,
1355 s->rl_chroma_table_index,
1356 s->dc_table_index,
1357 s->mv_table_index,
1358 s->per_mb_rl_table,
1359 s->qscale);
1360
1361 if(s->flipflop_rounding){
1362 s->no_rounding ^= 1;
1363 }else{
1364 s->no_rounding = 0;
1365 }
1366 }
1367 //printf("%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height);
1368
1369 s->esc3_level_length= 0;
1370 s->esc3_run_length= 0;
1371
1372 #ifdef DEBUG
1373 printf("*****frame %d:\n", frame_count++);
1374 #endif
1375 return 0;
1376 }
1377
1378 int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
1379 {
1380 int left= buf_size*8 - get_bits_count(&s->gb);
1381 int length= s->msmpeg4_version>=3 ? 17 : 16;
1382 /* the alt_bitstream reader could read over the end so we need to check it */
1383 if(left>=length && left<length+8)
1384 {
1385 int fps;
1386
1387 fps= get_bits(&s->gb, 5);
1388 s->bit_rate= get_bits(&s->gb, 11)*1024;
1389 if(s->msmpeg4_version>=3)
1390 s->flipflop_rounding= get_bits1(&s->gb);
1391 else
1392 s->flipflop_rounding= 0;
1393
1394 // printf("fps:%2d bps:%2d roundingType:%1d\n", fps, s->bit_rate/1024, s->flipflop_rounding);
1395 }
1396 else if(left<length+8)
1397 {
1398 s->flipflop_rounding= 0;
1399 if(s->msmpeg4_version != 2)
1400 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
1401 }
1402 else
1403 {
1404 av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
1405 }
1406
1407 return 0;
1408 }
1409
1410 static inline void msmpeg4_memsetw(short *tab, int val, int n)
1411 {
1412 int i;
1413 for(i=0;i<n;i++)
1414 tab[i] = val;
1415 }
1416
1417 static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
1418 {
1419 int range, bit_size, sign, code, bits;
1420
1421 if (val == 0) {
1422 /* zero vector */
1423 code = 0;
1424 put_bits(&s->pb, mvtab[code][1], mvtab[code][0]);
1425 } else {
1426 bit_size = s->f_code - 1;
1427 range = 1 << bit_size;
1428 if (val <= -64)
1429 val += 64;
1430 else if (val >= 64)
1431 val -= 64;
1432
1433 if (val >= 0) {
1434 sign = 0;
1435 } else {
1436 val = -val;
1437 sign = 1;
1438 }
1439 val--;
1440 code = (val >> bit_size) + 1;
1441 bits = val & (range - 1);
1442
1443 put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign);
1444 if (bit_size > 0) {
1445 put_bits(&s->pb, bit_size, bits);
1446 }
1447 }
1448 }
1449
1450 /* this is identical to h263 except that its range is multiplied by 2 */
1451 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
1452 {
1453 int code, val, sign, shift;
1454
1455 code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
1456 // printf("MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
1457 if (code < 0)
1458 return 0xffff;
1459
1460 if (code == 0)
1461 return pred;
1462 sign = get_bits1(&s->gb);
1463 shift = f_code - 1;
1464 val = code;
1465 if (shift) {
1466 val = (val - 1) << shift;
1467 val |= get_bits(&s->gb, shift);
1468 val++;
1469 }
1470 if (sign)
1471 val = -val;
1472
1473 val += pred;
1474 if (val <= -64)
1475 val += 64;
1476 else if (val >= 64)
1477 val -= 64;
1478
1479 return val;
1480 }
1481
1482 static int msmpeg4v12_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
1483 {
1484 int cbp, code, i;
1485
1486 if (s->pict_type == P_TYPE) {
1487 if (s->use_skip_mb_code) {
1488 if (get_bits1(&s->gb)) {
1489 /* skip mb */
1490 s->mb_intra = 0;
1491 for(i=0;i<6;i++)
1492 s->block_last_index[i] = -1;
1493 s->mv_dir = MV_DIR_FORWARD;
1494 s->mv_type = MV_TYPE_16X16;
1495 s->mv[0][0][0] = 0;
1496 s->mv[0][0][1] = 0;
1497 s->mb_skipped = 1;
1498 return 0;
1499 }
1500 }
1501
1502 if(s->msmpeg4_version==2)
1503 code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
1504 else
1505 code = get_vlc2(&s->gb, v1_inter_cbpc_vlc.table, V1_INTER_CBPC_VLC_BITS, 3);
1506 if(code<0 || code>7){
1507 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
1508 return -1;
1509 }
1510
1511 s->mb_intra = code >>2;
1512
1513 cbp = code & 0x3;
1514 } else {
1515 s->mb_intra = 1;
1516 if(s->msmpeg4_version==2)
1517 cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
1518 else
1519 cbp= get_vlc2(&s->gb, v1_intra_cbpc_vlc.table, V1_INTRA_CBPC_VLC_BITS, 1);
1520 if(cbp<0 || cbp>3){
1521 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
1522 return -1;
1523 }
1524 }
1525
1526 if (!s->mb_intra) {
1527 int mx, my, cbpy;
1528
1529 cbpy= get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
1530 if(cbpy<0){
1531 av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
1532 return -1;
1533 }
1534
1535 cbp|= cbpy<<2;
1536 if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
1537
1538 h263_pred_motion(s, 0, 0, &mx, &my);
1539 mx= msmpeg4v2_decode_motion(s, mx, 1);
1540 my= msmpeg4v2_decode_motion(s, my, 1);
1541
1542 s->mv_dir = MV_DIR_FORWARD;
1543 s->mv_type = MV_TYPE_16X16;
1544 s->mv[0][0][0] = mx;
1545 s->mv[0][0][1] = my;
1546 } else {
1547 if(s->msmpeg4_version==2){
1548 s->ac_pred = get_bits1(&s->gb);
1549 cbp|= get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
1550 } else{
1551 s->ac_pred = 0;
1552 cbp|= get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
1553 if(s->pict_type==P_TYPE) cbp^=0x3C;
1554 }
1555 }
1556
1557 s->dsp.clear_blocks(s->block[0]);
1558 for (i = 0; i < 6; i++) {
1559 if (msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
1560 {
1561 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
1562 return -1;
1563 }
1564 }
1565 return 0;
1566 }
1567
1568 static int msmpeg4v34_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
1569 {
1570 int cbp, code, i;
1571 uint8_t *coded_val;
1572 uint32_t * const mb_type_ptr= &s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ];
1573
1574 if (s->pict_type == P_TYPE) {
1575 set_stat(ST_INTER_MB);
1576 if (s->use_skip_mb_code) {
1577 if (get_bits1(&s->gb)) {
1578 /* skip mb */
1579 s->mb_intra = 0;
1580 for(i=0;i<6;i++)
1581 s->block_last_index[i] = -1;
1582 s->mv_dir = MV_DIR_FORWARD;
1583 s->mv_type = MV_TYPE_16X16;
1584 s->mv[0][0][0] = 0;
1585 s->mv[0][0][1] = 0;
1586 s->mb_skipped = 1;
1587 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
1588
1589 return 0;
1590 }
1591 }
1592
1593 code = get_vlc2(&s->gb, mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
1594 if (code < 0)
1595 return -1;
1596 //s->mb_intra = (code & 0x40) ? 0 : 1;
1597 s->mb_intra = (~code & 0x40) >> 6;
1598
1599 cbp = code & 0x3f;
1600 } else {
1601 set_stat(ST_INTRA_MB);
1602 s->mb_intra = 1;
1603 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
1604 if (code < 0)
1605 return -1;
1606 /* predict coded block pattern */
1607 cbp = 0;
1608 for(i=0;i<6;i++) {
1609 int val = ((code >> (5 - i)) & 1);
1610 if (i < 4) {
1611 int pred = coded_block_pred(s, i, &coded_val);
1612 val = val ^ pred;
1613 *coded_val = val;
1614 }
1615 cbp |= val << (5 - i);
1616 }
1617 }
1618
1619 if (!s->mb_intra) {
1620 int mx, my;
1621 //printf("P at %d %d\n", s->mb_x, s->mb_y);
1622 if(s->per_mb_rl_table && cbp){
1623 s->rl_table_index = decode012(&s->gb);
1624 s->rl_chroma_table_index = s->rl_table_index;
1625 }
1626 set_stat(ST_MV);
1627 h263_pred_motion(s, 0, 0, &mx, &my);
1628 if (msmpeg4_decode_motion(s, &mx, &my) < 0)
1629 return -1;
1630 s->mv_dir = MV_DIR_FORWARD;
1631 s->mv_type = MV_TYPE_16X16;
1632 s->mv[0][0][0] = mx;
1633 s->mv[0][0][1] = my;
1634 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
1635 } else {
1636 //printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));
1637 set_stat(ST_INTRA_MB);
1638 s->ac_pred = get_bits1(&s->gb);
1639 *mb_type_ptr = MB_TYPE_INTRA;
1640 if(s->inter_intra_pred){
1641 s->h263_aic_dir= get_vlc2(&s->gb, inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
1642 // printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
1643 }
1644 if(s->per_mb_rl_table && cbp){
1645 s->rl_table_index = decode012(&s->gb);
1646 s->rl_chroma_table_index = s->rl_table_index;
1647 }
1648 }
1649
1650 s->dsp.clear_blocks(s->block[0]);
1651 for (i = 0; i < 6; i++) {
1652 if (msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
1653 {
1654 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
1655 return -1;
1656 }
1657 }
1658
1659 return 0;
1660 }
1661 //#define ERROR_DETAILS
1662 static inline int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
1663 int n, int coded, const uint8_t *scan_table)
1664 {
1665 int level, i, last, run, run_diff;
1666 int dc_pred_dir;
1667 RLTable *rl;
1668 RL_VLC_ELEM *rl_vlc;
1669 int qmul, qadd;
1670
1671 if (s->mb_intra) {
1672 qmul=1;
1673 qadd=0;
1674
1675 /* DC coef */
1676 set_stat(ST_DC);
1677 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
1678
1679 if (level < 0){
1680 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
1681 if(s->inter_intra_pred) level=0;
1682 else return -1;
1683 }
1684 if (n < 4) {
1685 rl = &rl_table[s->rl_table_index];
1686 if(level > 256*s->y_dc_scale){
1687 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
1688 if(!s->inter_intra_pred) return -1;
1689 }
1690 } else {
1691 rl = &rl_table[3 + s->rl_chroma_table_index];
1692 if(level > 256*s->c_dc_scale){
1693 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
1694 if(!s->inter_intra_pred) return -1;
1695 }
1696 }
1697 block[0] = level;
1698
1699 run_diff = 0;
1700 i = 0;
1701 if (!coded) {
1702 goto not_coded;
1703 }
1704 if (s->ac_pred) {
1705 if (dc_pred_dir == 0)
1706 scan_table = s->intra_v_scantable.permutated; /* left */
1707 else
1708 scan_table = s->intra_h_scantable.permutated; /* top */
1709 } else {
1710 scan_table = s->intra_scantable.permutated;
1711 }
1712 set_stat(ST_INTRA_AC);
1713 rl_vlc= rl->rl_vlc[0];
1714 } else {
1715 qmul = s->qscale << 1;
1716 qadd = (s->qscale - 1) | 1;
1717 i = -1;
1718 rl = &rl_table[3 + s->rl_table_index];
1719
1720 if(s->msmpeg4_version==2)
1721 run_diff = 0;
1722 else
1723 run_diff = 1;
1724
1725 if (!coded) {
1726 s->block_last_index[n] = i;
1727 return 0;
1728 }
1729 if(!scan_table)
1730 scan_table = s->inter_scantable.permutated;
1731 set_stat(ST_INTER_AC);
1732 rl_vlc= rl->rl_vlc[s->qscale];
1733 }
1734 {
1735 OPEN_READER(re, &s->gb);
1736 for(;;) {
1737 UPDATE_CACHE(re, &s->gb);
1738 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1739 if (level==0) {
1740 int cache;
1741 cache= GET_CACHE(re, &s->gb);
1742 /* escape */
1743 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
1744 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
1745 /* third escape */
1746 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
1747 UPDATE_CACHE(re, &s->gb);
1748 if(s->msmpeg4_version<=3){
1749 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
1750 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
1751 level= SHOW_SBITS(re, &s->gb, 8); LAST_SKIP_CACHE(re, &s->gb, 8);
1752 SKIP_COUNTER(re, &s->gb, 1+6+8);
1753 }else{
1754 int sign;
1755 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
1756 if(!s->esc3_level_length){
1757 int ll;
1758 //printf("ESC-3 %X at %d %d\n", show_bits(&s->gb, 24), s->mb_x, s->mb_y);
1759 if(s->qscale<8){
1760 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
1761 if(ll==0){
1762 if(SHOW_UBITS(re, &s->gb, 1)) av_log(s->avctx, AV_LOG_ERROR, "cool a new vlc code ,contact the ffmpeg developers and upload the file\n");
1763 SKIP_BITS(re, &s->gb, 1);
1764 ll=8;
1765 }
1766 }else{
1767 ll=2;
1768 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
1769 ll++;
1770 SKIP_BITS(re, &s->gb, 1);
1771 }
1772 if(ll<8) SKIP_BITS(re, &s->gb, 1);
1773 }
1774
1775 s->esc3_level_length= ll;
1776 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
1777 //printf("level length:%d, run length: %d\n", ll, s->esc3_run_length);
1778 UPDATE_CACHE(re, &s->gb);
1779 }
1780 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
1781 SKIP_BITS(re, &s->gb, s->esc3_run_length);
1782
1783 sign= SHOW_UBITS(re, &s->gb, 1);
1784 SKIP_BITS(re, &s->gb, 1);
1785
1786 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
1787 SKIP_BITS(re, &s->gb, s->esc3_level_length);
1788 if(sign) level= -level;
1789 }
1790 //printf("level: %d, run: %d at %d %d\n", level, run, s->mb_x, s->mb_y);
1791 #if 0 // waste of time / this will detect very few errors
1792 {
1793 const int abs_level= ABS(level);
1794 const int run1= run - rl->max_run[last][abs_level] - run_diff;
1795 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
1796 if(abs_level <= rl->max_level[last][run]){
1797 fprintf(stderr, "illegal 3. esc, vlc encoding possible\n");
1798 return DECODING_AC_LOST;
1799 }
1800 if(abs_level <= rl->max_level[last][run]*2){
1801 fprintf(stderr, "illegal 3. esc, esc 1 encoding possible\n");
1802 return DECODING_AC_LOST;
1803 }
1804 if(run1>=0 && abs_level <= rl->max_level[last][run1]){
1805 fprintf(stderr, "illegal 3. esc, esc 2 encoding possible\n");
1806 return DECODING_AC_LOST;
1807 }
1808 }
1809 }
1810 #endif
1811 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
1812 if (level>0) level= level * qmul + qadd;
1813 else level= level * qmul - qadd;
1814 #if 0 // waste of time too :(
1815 if(level>2048 || level<-2048){
1816 fprintf(stderr, "|level| overflow in 3. esc\n");
1817 return DECODING_AC_LOST;
1818 }
1819 #endif
1820 i+= run + 1;
1821 if(last) i+=192;
1822 #ifdef ERROR_DETAILS
1823 if(run==66)
1824 fprintf(stderr, "illegal vlc code in ESC3 level=%d\n", level);
1825 else if((i>62 && i<192) || i>192+63)
1826 fprintf(stderr, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
1827 #endif
1828 } else {
1829 /* second escape */
1830 #if MIN_CACHE_BITS < 23
1831 LAST_SKIP_BITS(re, &s->gb, 2);
1832 UPDATE_CACHE(re, &s->gb);
1833 #else
1834 SKIP_BITS(re, &s->gb, 2);
1835 #endif
1836 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1837 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
1838 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1839 LAST_SKIP_BITS(re, &s->gb, 1);
1840 #ifdef ERROR_DETAILS
1841 if(run==66)
1842 fprintf(stderr, "illegal vlc code in ESC2 level=%d\n", level);
1843 else if((i>62 && i<192) || i>192+63)
1844 fprintf(stderr, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
1845 #endif
1846 }
1847 } else {
1848 /* first escape */
1849 #if MIN_CACHE_BITS < 22
1850 LAST_SKIP_BITS(re, &s->gb, 1);
1851 UPDATE_CACHE(re, &s->gb);
1852 #else
1853 SKIP_BITS(re, &s->gb, 1);
1854 #endif
1855 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1856 i+= run;
1857 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
1858 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1859 LAST_SKIP_BITS(re, &s->gb, 1);
1860 #ifdef ERROR_DETAILS
1861 if(run==66)
1862 fprintf(stderr, "illegal vlc code in ESC1 level=%d\n", level);
1863 else if((i>62 && i<192) || i>192+63)
1864 fprintf(stderr, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
1865 #endif
1866 }
1867 } else {
1868 i+= run;
1869 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1870 LAST_SKIP_BITS(re, &s->gb, 1);
1871 #ifdef ERROR_DETAILS
1872 if(run==66)
1873 fprintf(stderr, "illegal vlc code level=%d\n", level);
1874 else if((i>62 && i<192) || i>192+63)
1875 fprintf(stderr, "run overflow i=%d run=%d level=%d\n", i, run, level);
1876 #endif
1877 }
1878 if (i > 62){
1879 i-= 192;
1880 if(i&(~63)){
1881 const int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1882 if(((i+192 == 64 && level/qmul==-1) || s->error_resilience<=1) && left>=0){
1883 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
1884 break;
1885 }else{
1886 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1887 return -1;
1888 }
1889 }
1890
1891 block[scan_table[i]] = level;
1892 break;
1893 }
1894
1895 block[scan_table[i]] = level;
1896 }
1897 CLOSE_READER(re, &s->gb);
1898 }
1899 not_coded:
1900 if (s->mb_intra) {
1901 mpeg4_pred_ac(s, block, n, dc_pred_dir);
1902 if (s->ac_pred) {
1903 i = 63; /* XXX: not optimal */
1904 }
1905 }
1906 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
1907 s->block_last_index[n] = i;
1908
1909 return 0;
1910 }
1911
1912 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
1913 {
1914 int level, pred;
1915
1916 if(s->msmpeg4_version<=2){
1917 if (n < 4) {
1918 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
1919 } else {
1920 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
1921 }
1922 if (level < 0)
1923 return -1;
1924 level-=256;
1925 }else{ //FIXME optimize use unified tables & index
1926 if (n < 4) {
1927 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
1928 } else {
1929 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
1930 }
1931 if (level < 0){
1932 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
1933 return -1;
1934 }
1935
1936 if (level == DC_MAX) {
1937 level = get_bits(&s->gb, 8);
1938 if (get_bits1(&s->gb))
1939 level = -level;
1940 } else if (level != 0) {
1941 if (get_bits1(&s->gb))
1942 level = -level;
1943 }
1944 }
1945
1946 if(s->msmpeg4_version==1){
1947 int32_t *dc_val;
1948 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
1949 level += pred;
1950
1951 /* update predictor */
1952 *dc_val= level;
1953 }else{
1954 uint16_t *dc_val;
1955 pred = msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
1956 level += pred;
1957
1958 /* update predictor */
1959 if (n < 4) {
1960 *dc_val = level * s->y_dc_scale;
1961 } else {
1962 *dc_val = level * s->c_dc_scale;
1963 }
1964 }
1965
1966 return level;
1967 }
1968
1969 static int msmpeg4_decode_motion(MpegEncContext * s,
1970 int *mx_ptr, int *my_ptr)
1971 {
1972 MVTable *mv;
1973 int code, mx, my;
1974
1975 mv = &mv_tables[s->mv_table_index];
1976
1977 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
1978 if (code < 0){
1979 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
1980 return -1;
1981 }
1982 if (code == mv->n) {
1983 //printf("MV ESC %X at %d %d\n", show_bits(&s->gb, 24), s->mb_x, s->mb_y);
1984 mx = get_bits(&s->gb, 6);
1985 my = get_bits(&s->gb, 6);
1986 } else {
1987 mx = mv->table_mvx[code];
1988 my = mv->table_mvy[code];
1989 }
1990
1991 mx += *mx_ptr - 32;
1992 my += *my_ptr - 32;
1993 /* WARNING : they do not do exactly modulo encoding */
1994 if (mx <= -64)
1995 mx += 64;
1996 else if (mx >= 64)
1997 mx -= 64;
1998
1999 if (my <= -64)
2000 my += 64;
2001 else if (my >= 64)
2002 my -= 64;
2003 *mx_ptr = mx;
2004 *my_ptr = my;
2005 return 0;
2006 }
2007
2008 /* cleanest way to support it
2009 * there is too much shared between versions so that we cant have 1 file per version & 1 common
2010 * as allmost everything would be in the common file
2011 */
2012 #include "wmv2.c"
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