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aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / libavcodec / msmpeg4dec.c
bloba2d0ad4294cac8284409deea35852783ecf80397
1 /*
2 * MSMPEG4 backend for encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of Libav.
9 *
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * Libav 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 GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "avcodec.h"
26 #include "internal.h"
27 #include "mpegutils.h"
28 #include "mpegvideo.h"
29 #include "msmpeg4.h"
30 #include "h263.h"
31 #include "mpeg4video.h"
32 #include "msmpeg4data.h"
33 #include "vc1data.h"
34 #include "wmv2.h"
35
36 #define DC_VLC_BITS 9
37 #define V2_INTRA_CBPC_VLC_BITS 3
38 #define V2_MB_TYPE_VLC_BITS 7
39 #define MV_VLC_BITS 9
40 #define V2_MV_VLC_BITS 9
41 #define TEX_VLC_BITS 9
42
43 #define DEFAULT_INTER_INDEX 3
44
45 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
46 int32_t **dc_val_ptr)
47 {
48 int i;
49
50 if (n < 4) {
51 i= 0;
52 } else {
53 i= n-3;
54 }
55
56 *dc_val_ptr= &s->last_dc[i];
57 return s->last_dc[i];
58 }
59
60 /****************************************/
61 /* decoding stuff */
62
63 VLC ff_mb_non_intra_vlc[4];
64 static VLC v2_dc_lum_vlc;
65 static VLC v2_dc_chroma_vlc;
66 static VLC v2_intra_cbpc_vlc;
67 static VLC v2_mb_type_vlc;
68 static VLC v2_mv_vlc;
69 VLC ff_inter_intra_vlc;
70
71 /* This is identical to H.263 except that its range is multiplied by 2. */
72 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
73 {
74 int code, val, sign, shift;
75
76 code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
77 ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
78 if (code < 0)
79 return 0xffff;
80
81 if (code == 0)
82 return pred;
83 sign = get_bits1(&s->gb);
84 shift = f_code - 1;
85 val = code;
86 if (shift) {
87 val = (val - 1) << shift;
88 val |= get_bits(&s->gb, shift);
89 val++;
90 }
91 if (sign)
92 val = -val;
93
94 val += pred;
95 if (val <= -64)
96 val += 64;
97 else if (val >= 64)
98 val -= 64;
99
100 return val;
101 }
102
103 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
104 {
105 int cbp, code, i;
106
107 if (s->pict_type == AV_PICTURE_TYPE_P) {
108 if (s->use_skip_mb_code) {
109 if (get_bits1(&s->gb)) {
110 /* skip mb */
111 s->mb_intra = 0;
112 for(i=0;i<6;i++)
113 s->block_last_index[i] = -1;
114 s->mv_dir = MV_DIR_FORWARD;
115 s->mv_type = MV_TYPE_16X16;
116 s->mv[0][0][0] = 0;
117 s->mv[0][0][1] = 0;
118 s->mb_skipped = 1;
119 return 0;
120 }
121 }
122
123 if(s->msmpeg4_version==2)
124 code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
125 else
126 code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
127 if(code<0 || code>7){
128 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
129 return -1;
130 }
131
132 s->mb_intra = code >>2;
133
134 cbp = code & 0x3;
135 } else {
136 s->mb_intra = 1;
137 if(s->msmpeg4_version==2)
138 cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
139 else
140 cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
141 if(cbp<0 || cbp>3){
142 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
143 return -1;
144 }
145 }
146
147 if (!s->mb_intra) {
148 int mx, my, cbpy;
149
150 cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
151 if(cbpy<0){
152 av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
153 return -1;
154 }
155
156 cbp|= cbpy<<2;
157 if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
158
159 ff_h263_pred_motion(s, 0, 0, &mx, &my);
160 mx= msmpeg4v2_decode_motion(s, mx, 1);
161 my= msmpeg4v2_decode_motion(s, my, 1);
162
163 s->mv_dir = MV_DIR_FORWARD;
164 s->mv_type = MV_TYPE_16X16;
165 s->mv[0][0][0] = mx;
166 s->mv[0][0][1] = my;
167 } else {
168 if(s->msmpeg4_version==2){
169 s->ac_pred = get_bits1(&s->gb);
170 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
171 } else{
172 s->ac_pred = 0;
173 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
174 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
175 }
176 }
177
178 s->bdsp.clear_blocks(s->block[0]);
179 for (i = 0; i < 6; i++) {
180 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
181 {
182 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
183 return -1;
184 }
185 }
186 return 0;
187 }
188
189 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
190 {
191 int cbp, code, i;
192 uint8_t *coded_val;
193 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
194
195 if (s->pict_type == AV_PICTURE_TYPE_P) {
196 if (s->use_skip_mb_code) {
197 if (get_bits1(&s->gb)) {
198 /* skip mb */
199 s->mb_intra = 0;
200 for(i=0;i<6;i++)
201 s->block_last_index[i] = -1;
202 s->mv_dir = MV_DIR_FORWARD;
203 s->mv_type = MV_TYPE_16X16;
204 s->mv[0][0][0] = 0;
205 s->mv[0][0][1] = 0;
206 s->mb_skipped = 1;
207 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
208
209 return 0;
210 }
211 }
212
213 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
214 if (code < 0)
215 return -1;
216 //s->mb_intra = (code & 0x40) ? 0 : 1;
217 s->mb_intra = (~code & 0x40) >> 6;
218
219 cbp = code & 0x3f;
220 } else {
221 s->mb_intra = 1;
222 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
223 if (code < 0)
224 return -1;
225 /* predict coded block pattern */
226 cbp = 0;
227 for(i=0;i<6;i++) {
228 int val = ((code >> (5 - i)) & 1);
229 if (i < 4) {
230 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
231 val = val ^ pred;
232 *coded_val = val;
233 }
234 cbp |= val << (5 - i);
235 }
236 }
237
238 if (!s->mb_intra) {
239 int mx, my;
240 if(s->per_mb_rl_table && cbp){
241 s->rl_table_index = decode012(&s->gb);
242 s->rl_chroma_table_index = s->rl_table_index;
243 }
244 ff_h263_pred_motion(s, 0, 0, &mx, &my);
245 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
246 return -1;
247 s->mv_dir = MV_DIR_FORWARD;
248 s->mv_type = MV_TYPE_16X16;
249 s->mv[0][0][0] = mx;
250 s->mv[0][0][1] = my;
251 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
252 } else {
253 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
254 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
255 show_bits(&s->gb, 24));
256 s->ac_pred = get_bits1(&s->gb);
257 *mb_type_ptr = MB_TYPE_INTRA;
258 if(s->inter_intra_pred){
259 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
260 ff_dlog(s, "%d%d %d %d/",
261 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
262 }
263 if(s->per_mb_rl_table && cbp){
264 s->rl_table_index = decode012(&s->gb);
265 s->rl_chroma_table_index = s->rl_table_index;
266 }
267 }
268
269 s->bdsp.clear_blocks(s->block[0]);
270 for (i = 0; i < 6; i++) {
271 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
272 {
273 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
274 return -1;
275 }
276 }
277
278 return 0;
279 }
280
281 /* init all vlc decoding tables */
282 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
283 {
284 MpegEncContext *s = avctx->priv_data;
285 static int done = 0;
286 int i;
287 MVTable *mv;
288
289 if (ff_h263_decode_init(avctx) < 0)
290 return -1;
291
292 ff_msmpeg4_common_init(s);
293
294 if (!done) {
295 done = 1;
296
297 for(i=0;i<NB_RL_TABLES;i++) {
298 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
299 }
300 INIT_VLC_RL(ff_rl_table[0], 642);
301 INIT_VLC_RL(ff_rl_table[1], 1104);
302 INIT_VLC_RL(ff_rl_table[2], 554);
303 INIT_VLC_RL(ff_rl_table[3], 940);
304 INIT_VLC_RL(ff_rl_table[4], 962);
305 INIT_VLC_RL(ff_rl_table[5], 554);
306
307 mv = &ff_mv_tables[0];
308 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
309 mv->table_mv_bits, 1, 1,
310 mv->table_mv_code, 2, 2, 3714);
311 mv = &ff_mv_tables[1];
312 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
313 mv->table_mv_bits, 1, 1,
314 mv->table_mv_code, 2, 2, 2694);
315
316 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
317 &ff_table0_dc_lum[0][1], 8, 4,
318 &ff_table0_dc_lum[0][0], 8, 4, 1158);
319 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
320 &ff_table0_dc_chroma[0][1], 8, 4,
321 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
322 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
323 &ff_table1_dc_lum[0][1], 8, 4,
324 &ff_table1_dc_lum[0][0], 8, 4, 1476);
325 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
326 &ff_table1_dc_chroma[0][1], 8, 4,
327 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
328
329 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
330 &ff_v2_dc_lum_table[0][1], 8, 4,
331 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
332 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
333 &ff_v2_dc_chroma_table[0][1], 8, 4,
334 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
335
336 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
337 &ff_v2_intra_cbpc[0][1], 2, 1,
338 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
339 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
340 &ff_v2_mb_type[0][1], 2, 1,
341 &ff_v2_mb_type[0][0], 2, 1, 128);
342 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
343 &ff_mvtab[0][1], 2, 1,
344 &ff_mvtab[0][0], 2, 1, 538);
345
346 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
347 &ff_wmv2_inter_table[0][0][1], 8, 4,
348 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
349 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
350 &ff_wmv2_inter_table[1][0][1], 8, 4,
351 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
352 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
353 &ff_wmv2_inter_table[2][0][1], 8, 4,
354 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
355 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
356 &ff_wmv2_inter_table[3][0][1], 8, 4,
357 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
358
359 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
360 &ff_msmp4_mb_i_table[0][1], 4, 2,
361 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
362
363 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
364 &ff_table_inter_intra[0][1], 2, 1,
365 &ff_table_inter_intra[0][0], 2, 1, 8);
366 }
367
368 switch(s->msmpeg4_version){
369 case 1:
370 case 2:
371 s->decode_mb= msmpeg4v12_decode_mb;
372 break;
373 case 3:
374 case 4:
375 s->decode_mb= msmpeg4v34_decode_mb;
376 break;
377 case 5:
378 if (CONFIG_WMV2_DECODER)
379 s->decode_mb= ff_wmv2_decode_mb;
380 case 6:
381 //FIXME + TODO VC1 decode mb
382 break;
383 }
384
385 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
386
387 return 0;
388 }
389
390 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
391 {
392 int code;
393
394 if(s->msmpeg4_version==1){
395 int start_code = get_bits_long(&s->gb, 32);
396 if(start_code!=0x00000100){
397 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
398 return -1;
399 }
400
401 skip_bits(&s->gb, 5); // frame number */
402 }
403
404 s->pict_type = get_bits(&s->gb, 2) + 1;
405 if (s->pict_type != AV_PICTURE_TYPE_I &&
406 s->pict_type != AV_PICTURE_TYPE_P){
407 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
408 return -1;
409 }
410 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
411 if(s->qscale==0){
412 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
413 return -1;
414 }
415
416 if (s->pict_type == AV_PICTURE_TYPE_I) {
417 code = get_bits(&s->gb, 5);
418 if(s->msmpeg4_version==1){
419 if(code==0 || code>s->mb_height){
420 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
421 return -1;
422 }
423
424 s->slice_height = code;
425 }else{
426 /* 0x17: one slice, 0x18: two slices, ... */
427 if (code < 0x17){
428 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
429 return -1;
430 }
431
432 s->slice_height = s->mb_height / (code - 0x16);
433 }
434
435 switch(s->msmpeg4_version){
436 case 1:
437 case 2:
438 s->rl_chroma_table_index = 2;
439 s->rl_table_index = 2;
440
441 s->dc_table_index = 0; //not used
442 break;
443 case 3:
444 s->rl_chroma_table_index = decode012(&s->gb);
445 s->rl_table_index = decode012(&s->gb);
446
447 s->dc_table_index = get_bits1(&s->gb);
448 break;
449 case 4:
450 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
451
452 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
453 else s->per_mb_rl_table= 0;
454
455 if(!s->per_mb_rl_table){
456 s->rl_chroma_table_index = decode012(&s->gb);
457 s->rl_table_index = decode012(&s->gb);
458 }
459
460 s->dc_table_index = get_bits1(&s->gb);
461 s->inter_intra_pred= 0;
462 break;
463 }
464 s->no_rounding = 1;
465 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
466 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
467 s->qscale,
468 s->rl_chroma_table_index,
469 s->rl_table_index,
470 s->dc_table_index,
471 s->per_mb_rl_table,
472 s->slice_height);
473 } else {
474 switch(s->msmpeg4_version){
475 case 1:
476 case 2:
477 if(s->msmpeg4_version==1)
478 s->use_skip_mb_code = 1;
479 else
480 s->use_skip_mb_code = get_bits1(&s->gb);
481 s->rl_table_index = 2;
482 s->rl_chroma_table_index = s->rl_table_index;
483 s->dc_table_index = 0; //not used
484 s->mv_table_index = 0;
485 break;
486 case 3:
487 s->use_skip_mb_code = get_bits1(&s->gb);
488 s->rl_table_index = decode012(&s->gb);
489 s->rl_chroma_table_index = s->rl_table_index;
490
491 s->dc_table_index = get_bits1(&s->gb);
492
493 s->mv_table_index = get_bits1(&s->gb);
494 break;
495 case 4:
496 s->use_skip_mb_code = get_bits1(&s->gb);
497
498 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
499 else s->per_mb_rl_table= 0;
500
501 if(!s->per_mb_rl_table){
502 s->rl_table_index = decode012(&s->gb);
503 s->rl_chroma_table_index = s->rl_table_index;
504 }
505
506 s->dc_table_index = get_bits1(&s->gb);
507
508 s->mv_table_index = get_bits1(&s->gb);
509 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
510 break;
511 }
512
513 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
514 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
515 s->use_skip_mb_code,
516 s->rl_table_index,
517 s->rl_chroma_table_index,
518 s->dc_table_index,
519 s->mv_table_index,
520 s->per_mb_rl_table,
521 s->qscale);
522
523 if(s->flipflop_rounding){
524 s->no_rounding ^= 1;
525 }else{
526 s->no_rounding = 0;
527 }
528 }
529 ff_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
530 s->inter_intra_pred, s->width, s->height);
531
532 s->esc3_level_length= 0;
533 s->esc3_run_length= 0;
534
535 return 0;
536 }
537
538 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
539 {
540 int left= buf_size*8 - get_bits_count(&s->gb);
541 int length= s->msmpeg4_version>=3 ? 17 : 16;
542 /* the alt_bitstream reader could read over the end so we need to check it */
543 if(left>=length && left<length+8)
544 {
545 skip_bits(&s->gb, 5); /* fps */
546 s->bit_rate= get_bits(&s->gb, 11)*1024;
547 if(s->msmpeg4_version>=3)
548 s->flipflop_rounding= get_bits1(&s->gb);
549 else
550 s->flipflop_rounding= 0;
551 }
552 else if(left<length+8)
553 {
554 s->flipflop_rounding= 0;
555 if(s->msmpeg4_version != 2)
556 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
557 }
558 else
559 {
560 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
561 }
562
563 return 0;
564 }
565
566 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
567 {
568 int level, pred;
569
570 if(s->msmpeg4_version<=2){
571 if (n < 4) {
572 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
573 } else {
574 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
575 }
576 if (level < 0)
577 return -1;
578 level-=256;
579 }else{ //FIXME optimize use unified tables & index
580 if (n < 4) {
581 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
582 } else {
583 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
584 }
585 if (level < 0){
586 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
587 return -1;
588 }
589
590 if (level == DC_MAX) {
591 level = get_bits(&s->gb, 8);
592 if (get_bits1(&s->gb))
593 level = -level;
594 } else if (level != 0) {
595 if (get_bits1(&s->gb))
596 level = -level;
597 }
598 }
599
600 if(s->msmpeg4_version==1){
601 int32_t *dc_val;
602 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
603 level += pred;
604
605 /* update predictor */
606 *dc_val= level;
607 }else{
608 int16_t *dc_val;
609 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
610 level += pred;
611
612 /* update predictor */
613 if (n < 4) {
614 *dc_val = level * s->y_dc_scale;
615 } else {
616 *dc_val = level * s->c_dc_scale;
617 }
618 }
619
620 return level;
621 }
622
623 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
624 int n, int coded, const uint8_t *scan_table)
625 {
626 int level, i, last, run, run_diff;
627 int av_uninit(dc_pred_dir);
628 RLTable *rl;
629 RL_VLC_ELEM *rl_vlc;
630 int qmul, qadd;
631
632 if (s->mb_intra) {
633 qmul=1;
634 qadd=0;
635
636 /* DC coef */
637 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
638
639 if (level < 0){
640 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
641 if(s->inter_intra_pred) level=0;
642 else return -1;
643 }
644 if (n < 4) {
645 rl = &ff_rl_table[s->rl_table_index];
646 if(level > 256*s->y_dc_scale){
647 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
648 if(!s->inter_intra_pred) return -1;
649 }
650 } else {
651 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
652 if(level > 256*s->c_dc_scale){
653 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
654 if(!s->inter_intra_pred) return -1;
655 }
656 }
657 block[0] = level;
658
659 run_diff = s->msmpeg4_version >= 4;
660 i = 0;
661 if (!coded) {
662 goto not_coded;
663 }
664 if (s->ac_pred) {
665 if (dc_pred_dir == 0)
666 scan_table = s->intra_v_scantable.permutated; /* left */
667 else
668 scan_table = s->intra_h_scantable.permutated; /* top */
669 } else {
670 scan_table = s->intra_scantable.permutated;
671 }
672 rl_vlc= rl->rl_vlc[0];
673 } else {
674 qmul = s->qscale << 1;
675 qadd = (s->qscale - 1) | 1;
676 i = -1;
677 rl = &ff_rl_table[3 + s->rl_table_index];
678
679 if(s->msmpeg4_version==2)
680 run_diff = 0;
681 else
682 run_diff = 1;
683
684 if (!coded) {
685 s->block_last_index[n] = i;
686 return 0;
687 }
688 if(!scan_table)
689 scan_table = s->inter_scantable.permutated;
690 rl_vlc= rl->rl_vlc[s->qscale];
691 }
692 {
693 OPEN_READER(re, &s->gb);
694 for(;;) {
695 UPDATE_CACHE(re, &s->gb);
696 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
697 if (level==0) {
698 int cache;
699 cache= GET_CACHE(re, &s->gb);
700 /* escape */
701 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
702 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
703 /* third escape */
704 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
705 UPDATE_CACHE(re, &s->gb);
706 if(s->msmpeg4_version<=3){
707 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
708 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
709 level= SHOW_SBITS(re, &s->gb, 8);
710 SKIP_COUNTER(re, &s->gb, 1+6+8);
711 }else{
712 int sign;
713 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
714 if(!s->esc3_level_length){
715 int ll;
716 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
717 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
718 if(s->qscale<8){
719 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
720 if(ll==0){
721 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
722 }
723 }else{
724 ll=2;
725 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
726 ll++;
727 SKIP_BITS(re, &s->gb, 1);
728 }
729 if(ll<8) SKIP_BITS(re, &s->gb, 1);
730 }
731
732 s->esc3_level_length= ll;
733 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
734 UPDATE_CACHE(re, &s->gb);
735 }
736 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
737 SKIP_BITS(re, &s->gb, s->esc3_run_length);
738
739 sign= SHOW_UBITS(re, &s->gb, 1);
740 SKIP_BITS(re, &s->gb, 1);
741
742 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
743 SKIP_BITS(re, &s->gb, s->esc3_level_length);
744 if(sign) level= -level;
745 }
746
747 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
748 if (level>0) level= level * qmul + qadd;
749 else level= level * qmul - qadd;
750 i+= run + 1;
751 if(last) i+=192;
752 } else {
753 /* second escape */
754 SKIP_BITS(re, &s->gb, 2);
755 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
756 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
757 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
758 LAST_SKIP_BITS(re, &s->gb, 1);
759 }
760 } else {
761 /* first escape */
762 SKIP_BITS(re, &s->gb, 1);
763 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
764 i+= run;
765 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
766 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
767 LAST_SKIP_BITS(re, &s->gb, 1);
768 }
769 } else {
770 i+= run;
771 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
772 LAST_SKIP_BITS(re, &s->gb, 1);
773 }
774 if (i > 62){
775 i-= 192;
776 if(i&(~63)){
777 const int left= get_bits_left(&s->gb);
778 if (((i + 192 == 64 && level / qmul == -1) ||
779 !(s->avctx->err_recognition & AV_EF_BITSTREAM)) &&
780 left >= 0) {
781 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
782 break;
783 }else{
784 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
785 return -1;
786 }
787 }
788
789 block[scan_table[i]] = level;
790 break;
791 }
792
793 block[scan_table[i]] = level;
794 }
795 CLOSE_READER(re, &s->gb);
796 }
797 not_coded:
798 if (s->mb_intra) {
799 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
800 if (s->ac_pred) {
801 i = 63; /* XXX: not optimal */
802 }
803 }
804 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
805 s->block_last_index[n] = i;
806
807 return 0;
808 }
809
810 int ff_msmpeg4_decode_motion(MpegEncContext * s,
811 int *mx_ptr, int *my_ptr)
812 {
813 MVTable *mv;
814 int code, mx, my;
815
816 mv = &ff_mv_tables[s->mv_table_index];
817
818 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
819 if (code < 0){
820 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
821 return -1;
822 }
823 if (code == mv->n) {
824 mx = get_bits(&s->gb, 6);
825 my = get_bits(&s->gb, 6);
826 } else {
827 mx = mv->table_mvx[code];
828 my = mv->table_mvy[code];
829 }
830
831 mx += *mx_ptr - 32;
832 my += *my_ptr - 32;
833 /* WARNING : they do not do exactly modulo encoding */
834 if (mx <= -64)
835 mx += 64;
836 else if (mx >= 64)
837 mx -= 64;
838
839 if (my <= -64)
840 my += 64;
841 else if (my >= 64)
842 my -= 64;
843 *mx_ptr = mx;
844 *my_ptr = my;
845 return 0;
846 }
847
848 AVCodec ff_msmpeg4v1_decoder = {
849 .name = "msmpeg4v1",
850 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
851 .type = AVMEDIA_TYPE_VIDEO,
852 .id = AV_CODEC_ID_MSMPEG4V1,
853 .priv_data_size = sizeof(MpegEncContext),
854 .init = ff_msmpeg4_decode_init,
855 .close = ff_h263_decode_end,
856 .decode = ff_h263_decode_frame,
857 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
858 .pix_fmts = (const enum AVPixelFormat[]) {
859 AV_PIX_FMT_YUV420P,
860 AV_PIX_FMT_NONE
861 },
862 };
863
864 AVCodec ff_msmpeg4v2_decoder = {
865 .name = "msmpeg4v2",
866 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
867 .type = AVMEDIA_TYPE_VIDEO,
868 .id = AV_CODEC_ID_MSMPEG4V2,
869 .priv_data_size = sizeof(MpegEncContext),
870 .init = ff_msmpeg4_decode_init,
871 .close = ff_h263_decode_end,
872 .decode = ff_h263_decode_frame,
873 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
874 .pix_fmts = (const enum AVPixelFormat[]) {
875 AV_PIX_FMT_YUV420P,
876 AV_PIX_FMT_NONE
877 },
878 };
879
880 AVCodec ff_msmpeg4v3_decoder = {
881 .name = "msmpeg4",
882 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
883 .type = AVMEDIA_TYPE_VIDEO,
884 .id = AV_CODEC_ID_MSMPEG4V3,
885 .priv_data_size = sizeof(MpegEncContext),
886 .init = ff_msmpeg4_decode_init,
887 .close = ff_h263_decode_end,
888 .decode = ff_h263_decode_frame,
889 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
890 .pix_fmts = (const enum AVPixelFormat[]) {
891 AV_PIX_FMT_YUV420P,
892 AV_PIX_FMT_NONE
893 },
894 };
895
896 AVCodec ff_wmv1_decoder = {
897 .name = "wmv1",
898 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
899 .type = AVMEDIA_TYPE_VIDEO,
900 .id = AV_CODEC_ID_WMV1,
901 .priv_data_size = sizeof(MpegEncContext),
902 .init = ff_msmpeg4_decode_init,
903 .close = ff_h263_decode_end,
904 .decode = ff_h263_decode_frame,
905 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
906 .pix_fmts = (const enum AVPixelFormat[]) {
907 AV_PIX_FMT_YUV420P,
908 AV_PIX_FMT_NONE
909 },
910 };
Modern FFMPEG