2 * MSMPEG4 backend for encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
8 * This file is part of Libav.
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.
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.
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
27 #include "mpegutils.h"
28 #include "mpegvideo.h"
30 #include "libavutil/x86/asm.h"
32 #include "mpeg4video.h"
33 #include "msmpeg4data.h"
38 #define V2_INTRA_CBPC_VLC_BITS 3
39 #define V2_MB_TYPE_VLC_BITS 7
41 #define V2_MV_VLC_BITS 9
42 #define TEX_VLC_BITS 9
44 #define DEFAULT_INTER_INDEX 3
46 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
57 *dc_val_ptr= &s->last_dc[i];
61 /****************************************/
64 VLC ff_mb_non_intra_vlc[4];
65 static VLC v2_dc_lum_vlc;
66 static VLC v2_dc_chroma_vlc;
67 static VLC v2_intra_cbpc_vlc;
68 static VLC v2_mb_type_vlc;
70 VLC ff_inter_intra_vlc;
72 /* This is identical to H.263 except that its range is multiplied by 2. */
73 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
75 int code, val, sign, shift;
77 code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
78 ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
84 sign = get_bits1(&s->gb);
88 val = (val - 1) << shift;
89 val |= get_bits(&s->gb, shift);
104 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
108 if (s->pict_type == AV_PICTURE_TYPE_P) {
109 if (s->use_skip_mb_code) {
110 if (get_bits1(&s->gb)) {
114 s->block_last_index[i] = -1;
115 s->mv_dir = MV_DIR_FORWARD;
116 s->mv_type = MV_TYPE_16X16;
124 if(s->msmpeg4_version==2)
125 code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
127 code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
128 if(code<0 || code>7){
129 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
133 s->mb_intra = code >>2;
138 if(s->msmpeg4_version==2)
139 cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
141 cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
143 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
151 cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
153 av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
158 if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
160 ff_h263_pred_motion(s, 0, 0, &mx, &my);
161 mx= msmpeg4v2_decode_motion(s, mx, 1);
162 my= msmpeg4v2_decode_motion(s, my, 1);
164 s->mv_dir = MV_DIR_FORWARD;
165 s->mv_type = MV_TYPE_16X16;
169 if(s->msmpeg4_version==2){
170 s->ac_pred = get_bits1(&s->gb);
171 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
174 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
175 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
179 s->bdsp.clear_blocks(s->block[0]);
180 for (i = 0; i < 6; i++) {
181 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
183 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
190 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
194 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
196 if (s->pict_type == AV_PICTURE_TYPE_P) {
197 if (s->use_skip_mb_code) {
198 if (get_bits1(&s->gb)) {
202 s->block_last_index[i] = -1;
203 s->mv_dir = MV_DIR_FORWARD;
204 s->mv_type = MV_TYPE_16X16;
208 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
214 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
217 //s->mb_intra = (code & 0x40) ? 0 : 1;
218 s->mb_intra = (~code & 0x40) >> 6;
223 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
226 /* predict coded block pattern */
229 int val = ((code >> (5 - i)) & 1);
231 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
235 cbp |= val << (5 - i);
241 if(s->per_mb_rl_table && cbp){
242 s->rl_table_index = decode012(&s->gb);
243 s->rl_chroma_table_index = s->rl_table_index;
245 ff_h263_pred_motion(s, 0, 0, &mx, &my);
246 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
248 s->mv_dir = MV_DIR_FORWARD;
249 s->mv_type = MV_TYPE_16X16;
252 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
254 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
255 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
256 show_bits(&s->gb, 24));
257 s->ac_pred = get_bits1(&s->gb);
258 *mb_type_ptr = MB_TYPE_INTRA;
259 if(s->inter_intra_pred){
260 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
261 ff_dlog(s, "%d%d %d %d/",
262 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
264 if(s->per_mb_rl_table && cbp){
265 s->rl_table_index = decode012(&s->gb);
266 s->rl_chroma_table_index = s->rl_table_index;
270 s->bdsp.clear_blocks(s->block[0]);
271 for (i = 0; i < 6; i++) {
272 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
274 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
282 /* init all vlc decoding tables */
283 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
285 MpegEncContext *s = avctx->priv_data;
290 if (ff_h263_decode_init(avctx) < 0)
293 ff_msmpeg4_common_init(s);
298 for(i=0;i<NB_RL_TABLES;i++) {
299 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
301 INIT_VLC_RL(ff_rl_table[0], 642);
302 INIT_VLC_RL(ff_rl_table[1], 1104);
303 INIT_VLC_RL(ff_rl_table[2], 554);
304 INIT_VLC_RL(ff_rl_table[3], 940);
305 INIT_VLC_RL(ff_rl_table[4], 962);
306 INIT_VLC_RL(ff_rl_table[5], 554);
308 mv = &ff_mv_tables[0];
309 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
310 mv->table_mv_bits, 1, 1,
311 mv->table_mv_code, 2, 2, 3714);
312 mv = &ff_mv_tables[1];
313 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
314 mv->table_mv_bits, 1, 1,
315 mv->table_mv_code, 2, 2, 2694);
317 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
318 &ff_table0_dc_lum[0][1], 8, 4,
319 &ff_table0_dc_lum[0][0], 8, 4, 1158);
320 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
321 &ff_table0_dc_chroma[0][1], 8, 4,
322 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
323 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
324 &ff_table1_dc_lum[0][1], 8, 4,
325 &ff_table1_dc_lum[0][0], 8, 4, 1476);
326 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
327 &ff_table1_dc_chroma[0][1], 8, 4,
328 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
330 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
331 &ff_v2_dc_lum_table[0][1], 8, 4,
332 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
333 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
334 &ff_v2_dc_chroma_table[0][1], 8, 4,
335 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
337 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
338 &ff_v2_intra_cbpc[0][1], 2, 1,
339 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
340 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
341 &ff_v2_mb_type[0][1], 2, 1,
342 &ff_v2_mb_type[0][0], 2, 1, 128);
343 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
344 &ff_mvtab[0][1], 2, 1,
345 &ff_mvtab[0][0], 2, 1, 538);
347 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
348 &ff_wmv2_inter_table[0][0][1], 8, 4,
349 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
350 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
351 &ff_wmv2_inter_table[1][0][1], 8, 4,
352 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
353 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
354 &ff_wmv2_inter_table[2][0][1], 8, 4,
355 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
356 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
357 &ff_wmv2_inter_table[3][0][1], 8, 4,
358 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
360 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
361 &ff_msmp4_mb_i_table[0][1], 4, 2,
362 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
364 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
365 &ff_table_inter_intra[0][1], 2, 1,
366 &ff_table_inter_intra[0][0], 2, 1, 8);
369 switch(s->msmpeg4_version){
372 s->decode_mb= msmpeg4v12_decode_mb;
376 s->decode_mb= msmpeg4v34_decode_mb;
379 if (CONFIG_WMV2_DECODER)
380 s->decode_mb= ff_wmv2_decode_mb;
382 //FIXME + TODO VC1 decode mb
386 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
391 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
395 if(s->msmpeg4_version==1){
396 int start_code = get_bits_long(&s->gb, 32);
397 if(start_code!=0x00000100){
398 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
402 skip_bits(&s->gb, 5); // frame number */
405 s->pict_type = get_bits(&s->gb, 2) + 1;
406 if (s->pict_type != AV_PICTURE_TYPE_I &&
407 s->pict_type != AV_PICTURE_TYPE_P){
408 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
414 if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1;
415 if(!had_i) return -1;
418 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
420 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
424 if (s->pict_type == AV_PICTURE_TYPE_I) {
425 code = get_bits(&s->gb, 5);
426 if(s->msmpeg4_version==1){
427 if(code==0 || code>s->mb_height){
428 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
432 s->slice_height = code;
434 /* 0x17: one slice, 0x18: two slices, ... */
436 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
440 s->slice_height = s->mb_height / (code - 0x16);
443 switch(s->msmpeg4_version){
446 s->rl_chroma_table_index = 2;
447 s->rl_table_index = 2;
449 s->dc_table_index = 0; //not used
452 s->rl_chroma_table_index = decode012(&s->gb);
453 s->rl_table_index = decode012(&s->gb);
455 s->dc_table_index = get_bits1(&s->gb);
458 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
460 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
461 else s->per_mb_rl_table= 0;
463 if(!s->per_mb_rl_table){
464 s->rl_chroma_table_index = decode012(&s->gb);
465 s->rl_table_index = decode012(&s->gb);
468 s->dc_table_index = get_bits1(&s->gb);
469 s->inter_intra_pred= 0;
473 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
474 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
476 s->rl_chroma_table_index,
482 switch(s->msmpeg4_version){
485 if(s->msmpeg4_version==1)
486 s->use_skip_mb_code = 1;
488 s->use_skip_mb_code = get_bits1(&s->gb);
489 s->rl_table_index = 2;
490 s->rl_chroma_table_index = s->rl_table_index;
491 s->dc_table_index = 0; //not used
492 s->mv_table_index = 0;
495 s->use_skip_mb_code = get_bits1(&s->gb);
496 s->rl_table_index = decode012(&s->gb);
497 s->rl_chroma_table_index = s->rl_table_index;
499 s->dc_table_index = get_bits1(&s->gb);
501 s->mv_table_index = get_bits1(&s->gb);
504 s->use_skip_mb_code = get_bits1(&s->gb);
506 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
507 else s->per_mb_rl_table= 0;
509 if(!s->per_mb_rl_table){
510 s->rl_table_index = decode012(&s->gb);
511 s->rl_chroma_table_index = s->rl_table_index;
514 s->dc_table_index = get_bits1(&s->gb);
516 s->mv_table_index = get_bits1(&s->gb);
517 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
521 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
522 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
525 s->rl_chroma_table_index,
531 if(s->flipflop_rounding){
537 ff_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
538 s->inter_intra_pred, s->width, s->height);
540 s->esc3_level_length= 0;
541 s->esc3_run_length= 0;
546 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
548 int left= buf_size*8 - get_bits_count(&s->gb);
549 int length= s->msmpeg4_version>=3 ? 17 : 16;
550 /* the alt_bitstream reader could read over the end so we need to check it */
551 if(left>=length && left<length+8)
553 skip_bits(&s->gb, 5); /* fps */
554 s->bit_rate= get_bits(&s->gb, 11)*1024;
555 if(s->msmpeg4_version>=3)
556 s->flipflop_rounding= get_bits1(&s->gb);
558 s->flipflop_rounding= 0;
560 else if(left<length+8)
562 s->flipflop_rounding= 0;
563 if(s->msmpeg4_version != 2)
564 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
568 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
574 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
578 if(s->msmpeg4_version<=2){
580 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
582 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
587 }else{ //FIXME optimize use unified tables & index
589 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
591 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
594 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
598 if (level == DC_MAX) {
599 level = get_bits(&s->gb, 8);
600 if (get_bits1(&s->gb))
602 } else if (level != 0) {
603 if (get_bits1(&s->gb))
608 if(s->msmpeg4_version==1){
610 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
613 /* update predictor */
617 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
620 /* update predictor */
622 *dc_val = level * s->y_dc_scale;
624 *dc_val = level * s->c_dc_scale;
631 //#define ERROR_DETAILS
632 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
633 int n, int coded, const uint8_t *scan_table)
635 int level, i, last, run, run_diff;
636 int av_uninit(dc_pred_dir);
646 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
649 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
650 if(s->inter_intra_pred) level=0;
654 rl = &ff_rl_table[s->rl_table_index];
655 if(level > 256*s->y_dc_scale){
656 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
657 if(!s->inter_intra_pred) return -1;
660 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
661 if(level > 256*s->c_dc_scale){
662 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
663 if(!s->inter_intra_pred) return -1;
668 run_diff = s->msmpeg4_version >= 4;
674 if (dc_pred_dir == 0)
675 scan_table = s->intra_v_scantable.permutated; /* left */
677 scan_table = s->intra_h_scantable.permutated; /* top */
679 scan_table = s->intra_scantable.permutated;
681 rl_vlc= rl->rl_vlc[0];
683 qmul = s->qscale << 1;
684 qadd = (s->qscale - 1) | 1;
686 rl = &ff_rl_table[3 + s->rl_table_index];
688 if(s->msmpeg4_version==2)
694 s->block_last_index[n] = i;
698 scan_table = s->inter_scantable.permutated;
699 rl_vlc= rl->rl_vlc[s->qscale];
702 OPEN_READER(re, &s->gb);
704 UPDATE_CACHE(re, &s->gb);
705 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
708 cache= GET_CACHE(re, &s->gb);
710 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
711 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
713 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
714 UPDATE_CACHE(re, &s->gb);
715 if(s->msmpeg4_version<=3){
716 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
717 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
718 level= SHOW_SBITS(re, &s->gb, 8);
719 SKIP_COUNTER(re, &s->gb, 1+6+8);
722 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
723 if(!s->esc3_level_length){
725 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
726 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
728 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
730 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
734 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
736 SKIP_BITS(re, &s->gb, 1);
738 if(ll<8) SKIP_BITS(re, &s->gb, 1);
741 s->esc3_level_length= ll;
742 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
743 UPDATE_CACHE(re, &s->gb);
745 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
746 SKIP_BITS(re, &s->gb, s->esc3_run_length);
748 sign= SHOW_UBITS(re, &s->gb, 1);
749 SKIP_BITS(re, &s->gb, 1);
751 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
752 SKIP_BITS(re, &s->gb, s->esc3_level_length);
753 if(sign) level= -level;
756 #if 0 // waste of time / this will detect very few errors
758 const int abs_level= FFABS(level);
759 const int run1= run - rl->max_run[last][abs_level] - run_diff;
760 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
761 if(abs_level <= rl->max_level[last][run]){
762 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
763 return DECODING_AC_LOST;
765 if(abs_level <= rl->max_level[last][run]*2){
766 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
767 return DECODING_AC_LOST;
769 if(run1>=0 && abs_level <= rl->max_level[last][run1]){
770 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
771 return DECODING_AC_LOST;
776 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
777 if (level>0) level= level * qmul + qadd;
778 else level= level * qmul - qadd;
779 #if 0 // waste of time too :(
780 if(level>2048 || level<-2048){
781 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n");
782 return DECODING_AC_LOST;
789 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level);
790 else if((i>62 && i<192) || i>192+63)
791 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
795 SKIP_BITS(re, &s->gb, 2);
796 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
797 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
798 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
799 LAST_SKIP_BITS(re, &s->gb, 1);
802 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level);
803 else if((i>62 && i<192) || i>192+63)
804 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
809 SKIP_BITS(re, &s->gb, 1);
810 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
812 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
813 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
814 LAST_SKIP_BITS(re, &s->gb, 1);
817 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level);
818 else if((i>62 && i<192) || i>192+63)
819 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
824 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
825 LAST_SKIP_BITS(re, &s->gb, 1);
828 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level);
829 else if((i>62 && i<192) || i>192+63)
830 av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level);
836 const int left= get_bits_left(&s->gb);
837 if (((i + 192 == 64 && level / qmul == -1) ||
838 !(s->avctx->err_recognition & AV_EF_BITSTREAM)) &&
840 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
843 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
848 block[scan_table[i]] = level;
852 block[scan_table[i]] = level;
854 CLOSE_READER(re, &s->gb);
858 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
860 i = 63; /* XXX: not optimal */
863 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
864 s->block_last_index[n] = i;
869 int ff_msmpeg4_decode_motion(MpegEncContext * s,
870 int *mx_ptr, int *my_ptr)
875 mv = &ff_mv_tables[s->mv_table_index];
877 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
879 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
883 mx = get_bits(&s->gb, 6);
884 my = get_bits(&s->gb, 6);
886 mx = mv->table_mvx[code];
887 my = mv->table_mvy[code];
892 /* WARNING : they do not do exactly modulo encoding */
907 AVCodec ff_msmpeg4v1_decoder = {
909 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
910 .type = AVMEDIA_TYPE_VIDEO,
911 .id = AV_CODEC_ID_MSMPEG4V1,
912 .priv_data_size = sizeof(MpegEncContext),
913 .init = ff_msmpeg4_decode_init,
914 .close = ff_h263_decode_end,
915 .decode = ff_h263_decode_frame,
916 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
917 .pix_fmts = (const enum AVPixelFormat[]) {
923 AVCodec ff_msmpeg4v2_decoder = {
925 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
926 .type = AVMEDIA_TYPE_VIDEO,
927 .id = AV_CODEC_ID_MSMPEG4V2,
928 .priv_data_size = sizeof(MpegEncContext),
929 .init = ff_msmpeg4_decode_init,
930 .close = ff_h263_decode_end,
931 .decode = ff_h263_decode_frame,
932 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
933 .pix_fmts = (const enum AVPixelFormat[]) {
939 AVCodec ff_msmpeg4v3_decoder = {
941 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
942 .type = AVMEDIA_TYPE_VIDEO,
943 .id = AV_CODEC_ID_MSMPEG4V3,
944 .priv_data_size = sizeof(MpegEncContext),
945 .init = ff_msmpeg4_decode_init,
946 .close = ff_h263_decode_end,
947 .decode = ff_h263_decode_frame,
948 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
949 .pix_fmts = (const enum AVPixelFormat[]) {
955 AVCodec ff_wmv1_decoder = {
957 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
958 .type = AVMEDIA_TYPE_VIDEO,
959 .id = AV_CODEC_ID_WMV1,
960 .priv_data_size = sizeof(MpegEncContext),
961 .init = ff_msmpeg4_decode_init,
962 .close = ff_h263_decode_end,
963 .decode = ff_h263_decode_frame,
964 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
965 .pix_fmts = (const enum AVPixelFormat[]) {