2 * MSMPEG4 backend for encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
6 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
8 * This file is part of FFmpeg.
10 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/imgutils.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])
107 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
109 if (s->pict_type == AV_PICTURE_TYPE_P) {
110 if (s->use_skip_mb_code) {
111 if (get_bits1(&s->gb)) {
115 s->block_last_index[i] = -1;
116 s->mv_dir = MV_DIR_FORWARD;
117 s->mv_type = MV_TYPE_16X16;
121 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
126 if(s->msmpeg4_version==2)
127 code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
129 code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
130 if(code<0 || code>7){
131 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
135 s->mb_intra = code >>2;
140 if(s->msmpeg4_version==2)
141 cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
143 cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
145 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
153 cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
155 av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
160 if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
162 ff_h263_pred_motion(s, 0, 0, &mx, &my);
163 mx= msmpeg4v2_decode_motion(s, mx, 1);
164 my= msmpeg4v2_decode_motion(s, my, 1);
166 s->mv_dir = MV_DIR_FORWARD;
167 s->mv_type = MV_TYPE_16X16;
170 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
173 if(s->msmpeg4_version==2){
174 s->ac_pred = get_bits1(&s->gb);
175 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
177 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
183 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
185 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
189 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
191 *mb_type_ptr = MB_TYPE_INTRA;
194 s->bdsp.clear_blocks(s->block[0]);
195 for (i = 0; i < 6; i++) {
196 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
198 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
205 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
209 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
211 if (s->pict_type == AV_PICTURE_TYPE_P) {
212 if (s->use_skip_mb_code) {
213 if (get_bits1(&s->gb)) {
217 s->block_last_index[i] = -1;
218 s->mv_dir = MV_DIR_FORWARD;
219 s->mv_type = MV_TYPE_16X16;
223 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
229 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
232 //s->mb_intra = (code & 0x40) ? 0 : 1;
233 s->mb_intra = (~code & 0x40) >> 6;
238 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
241 /* predict coded block pattern */
244 int val = ((code >> (5 - i)) & 1);
246 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
250 cbp |= val << (5 - i);
256 if(s->per_mb_rl_table && cbp){
257 s->rl_table_index = decode012(&s->gb);
258 s->rl_chroma_table_index = s->rl_table_index;
260 ff_h263_pred_motion(s, 0, 0, &mx, &my);
261 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
263 s->mv_dir = MV_DIR_FORWARD;
264 s->mv_type = MV_TYPE_16X16;
267 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
269 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
270 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
271 show_bits(&s->gb, 24));
272 s->ac_pred = get_bits1(&s->gb);
273 *mb_type_ptr = MB_TYPE_INTRA;
274 if(s->inter_intra_pred){
275 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
276 ff_dlog(s, "%d%d %d %d/",
277 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
279 if(s->per_mb_rl_table && cbp){
280 s->rl_table_index = decode012(&s->gb);
281 s->rl_chroma_table_index = s->rl_table_index;
285 s->bdsp.clear_blocks(s->block[0]);
286 for (i = 0; i < 6; i++) {
287 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
289 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
297 /* init all vlc decoding tables */
298 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
300 MpegEncContext *s = avctx->priv_data;
301 static volatile int done = 0;
305 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
308 if (ff_h263_decode_init(avctx) < 0)
311 ff_msmpeg4_common_init(s);
314 for(i=0;i<NB_RL_TABLES;i++) {
315 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
317 INIT_VLC_RL(ff_rl_table[0], 642);
318 INIT_VLC_RL(ff_rl_table[1], 1104);
319 INIT_VLC_RL(ff_rl_table[2], 554);
320 INIT_VLC_RL(ff_rl_table[3], 940);
321 INIT_VLC_RL(ff_rl_table[4], 962);
322 INIT_VLC_RL(ff_rl_table[5], 554);
324 mv = &ff_mv_tables[0];
325 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
326 mv->table_mv_bits, 1, 1,
327 mv->table_mv_code, 2, 2, 3714);
328 mv = &ff_mv_tables[1];
329 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
330 mv->table_mv_bits, 1, 1,
331 mv->table_mv_code, 2, 2, 2694);
333 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
334 &ff_table0_dc_lum[0][1], 8, 4,
335 &ff_table0_dc_lum[0][0], 8, 4, 1158);
336 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
337 &ff_table0_dc_chroma[0][1], 8, 4,
338 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
339 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
340 &ff_table1_dc_lum[0][1], 8, 4,
341 &ff_table1_dc_lum[0][0], 8, 4, 1476);
342 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
343 &ff_table1_dc_chroma[0][1], 8, 4,
344 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
346 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
347 &ff_v2_dc_lum_table[0][1], 8, 4,
348 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
349 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
350 &ff_v2_dc_chroma_table[0][1], 8, 4,
351 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
353 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
354 &ff_v2_intra_cbpc[0][1], 2, 1,
355 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
356 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
357 &ff_v2_mb_type[0][1], 2, 1,
358 &ff_v2_mb_type[0][0], 2, 1, 128);
359 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
360 &ff_mvtab[0][1], 2, 1,
361 &ff_mvtab[0][0], 2, 1, 538);
363 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
364 &ff_wmv2_inter_table[0][0][1], 8, 4,
365 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
366 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
367 &ff_wmv2_inter_table[1][0][1], 8, 4,
368 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
369 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
370 &ff_wmv2_inter_table[2][0][1], 8, 4,
371 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
372 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
373 &ff_wmv2_inter_table[3][0][1], 8, 4,
374 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
376 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
377 &ff_msmp4_mb_i_table[0][1], 4, 2,
378 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
380 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
381 &ff_table_inter_intra[0][1], 2, 1,
382 &ff_table_inter_intra[0][0], 2, 1, 8);
386 switch(s->msmpeg4_version){
389 s->decode_mb= msmpeg4v12_decode_mb;
393 s->decode_mb= msmpeg4v34_decode_mb;
396 if (CONFIG_WMV2_DECODER)
397 s->decode_mb= ff_wmv2_decode_mb;
399 //FIXME + TODO VC1 decode mb
403 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
408 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
412 if(s->msmpeg4_version==1){
413 int start_code = get_bits_long(&s->gb, 32);
414 if(start_code!=0x00000100){
415 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
419 skip_bits(&s->gb, 5); // frame number */
422 s->pict_type = get_bits(&s->gb, 2) + 1;
423 if (s->pict_type != AV_PICTURE_TYPE_I &&
424 s->pict_type != AV_PICTURE_TYPE_P){
425 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
428 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
430 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
434 if (s->pict_type == AV_PICTURE_TYPE_I) {
435 code = get_bits(&s->gb, 5);
436 if(s->msmpeg4_version==1){
437 if(code==0 || code>s->mb_height){
438 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
442 s->slice_height = code;
444 /* 0x17: one slice, 0x18: two slices, ... */
446 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
450 s->slice_height = s->mb_height / (code - 0x16);
453 switch(s->msmpeg4_version){
456 s->rl_chroma_table_index = 2;
457 s->rl_table_index = 2;
459 s->dc_table_index = 0; //not used
462 s->rl_chroma_table_index = decode012(&s->gb);
463 s->rl_table_index = decode012(&s->gb);
465 s->dc_table_index = get_bits1(&s->gb);
468 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
470 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
471 else s->per_mb_rl_table= 0;
473 if(!s->per_mb_rl_table){
474 s->rl_chroma_table_index = decode012(&s->gb);
475 s->rl_table_index = decode012(&s->gb);
478 s->dc_table_index = get_bits1(&s->gb);
479 s->inter_intra_pred= 0;
483 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
484 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
486 s->rl_chroma_table_index,
492 switch(s->msmpeg4_version){
495 if(s->msmpeg4_version==1)
496 s->use_skip_mb_code = 1;
498 s->use_skip_mb_code = get_bits1(&s->gb);
499 s->rl_table_index = 2;
500 s->rl_chroma_table_index = s->rl_table_index;
501 s->dc_table_index = 0; //not used
502 s->mv_table_index = 0;
505 s->use_skip_mb_code = get_bits1(&s->gb);
506 s->rl_table_index = decode012(&s->gb);
507 s->rl_chroma_table_index = s->rl_table_index;
509 s->dc_table_index = get_bits1(&s->gb);
511 s->mv_table_index = get_bits1(&s->gb);
514 s->use_skip_mb_code = get_bits1(&s->gb);
516 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
517 else s->per_mb_rl_table= 0;
519 if(!s->per_mb_rl_table){
520 s->rl_table_index = decode012(&s->gb);
521 s->rl_chroma_table_index = s->rl_table_index;
524 s->dc_table_index = get_bits1(&s->gb);
526 s->mv_table_index = get_bits1(&s->gb);
527 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
531 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
532 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
535 s->rl_chroma_table_index,
541 if(s->flipflop_rounding){
547 ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
548 s->inter_intra_pred, s->width, s->height);
550 s->esc3_level_length= 0;
551 s->esc3_run_length= 0;
556 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
558 int left= buf_size*8 - get_bits_count(&s->gb);
559 int length= s->msmpeg4_version>=3 ? 17 : 16;
560 /* the alt_bitstream reader could read over the end so we need to check it */
561 if(left>=length && left<length+8)
563 skip_bits(&s->gb, 5); /* fps */
564 s->bit_rate= get_bits(&s->gb, 11)*1024;
565 if(s->msmpeg4_version>=3)
566 s->flipflop_rounding= get_bits1(&s->gb);
568 s->flipflop_rounding= 0;
570 else if(left<length+8)
572 s->flipflop_rounding= 0;
573 if(s->msmpeg4_version != 2)
574 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
578 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
584 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
588 if(s->msmpeg4_version<=2){
590 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
592 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
595 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
600 }else{ //FIXME optimize use unified tables & index
602 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
604 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
607 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
612 if (level == DC_MAX) {
613 level = get_bits(&s->gb, 8);
614 if (get_bits1(&s->gb))
616 } else if (level != 0) {
617 if (get_bits1(&s->gb))
622 if(s->msmpeg4_version==1){
624 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
627 /* update predictor */
631 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
634 /* update predictor */
636 *dc_val = level * s->y_dc_scale;
638 *dc_val = level * s->c_dc_scale;
645 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
646 int n, int coded, const uint8_t *scan_table)
648 int level, i, last, run, run_diff;
649 int av_uninit(dc_pred_dir);
659 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
662 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
663 if(s->inter_intra_pred) level=0;
666 rl = &ff_rl_table[s->rl_table_index];
667 if(level > 256*s->y_dc_scale){
668 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
669 if(!s->inter_intra_pred) return -1;
672 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
673 if(level > 256*s->c_dc_scale){
674 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
675 if(!s->inter_intra_pred) return -1;
680 run_diff = s->msmpeg4_version >= 4;
686 if (dc_pred_dir == 0)
687 scan_table = s->intra_v_scantable.permutated; /* left */
689 scan_table = s->intra_h_scantable.permutated; /* top */
691 scan_table = s->intra_scantable.permutated;
693 rl_vlc= rl->rl_vlc[0];
695 qmul = s->qscale << 1;
696 qadd = (s->qscale - 1) | 1;
698 rl = &ff_rl_table[3 + s->rl_table_index];
700 if(s->msmpeg4_version==2)
706 s->block_last_index[n] = i;
710 scan_table = s->inter_scantable.permutated;
711 rl_vlc= rl->rl_vlc[s->qscale];
714 OPEN_READER(re, &s->gb);
716 UPDATE_CACHE(re, &s->gb);
717 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
720 cache= GET_CACHE(re, &s->gb);
722 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
723 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
725 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
726 UPDATE_CACHE(re, &s->gb);
727 if(s->msmpeg4_version<=3){
728 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
729 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
730 level= SHOW_SBITS(re, &s->gb, 8);
731 SKIP_COUNTER(re, &s->gb, 1+6+8);
734 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
735 if(!s->esc3_level_length){
737 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
738 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
740 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
742 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
746 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
748 SKIP_BITS(re, &s->gb, 1);
750 if(ll<8) SKIP_BITS(re, &s->gb, 1);
753 s->esc3_level_length= ll;
754 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
755 UPDATE_CACHE(re, &s->gb);
757 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
758 SKIP_BITS(re, &s->gb, s->esc3_run_length);
760 sign= SHOW_UBITS(re, &s->gb, 1);
761 SKIP_BITS(re, &s->gb, 1);
763 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
764 SKIP_BITS(re, &s->gb, s->esc3_level_length);
765 if(sign) level= -level;
768 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
769 if (level>0) level= level * qmul + qadd;
770 else level= level * qmul - qadd;
775 SKIP_BITS(re, &s->gb, 2);
776 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
777 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
778 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
779 LAST_SKIP_BITS(re, &s->gb, 1);
783 SKIP_BITS(re, &s->gb, 1);
784 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
786 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
787 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
788 LAST_SKIP_BITS(re, &s->gb, 1);
792 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
793 LAST_SKIP_BITS(re, &s->gb, 1);
798 const int left= get_bits_left(&s->gb);
799 if (((i + 192 == 64 && level / qmul == -1) ||
800 !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
802 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
806 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
811 block[scan_table[i]] = level;
815 block[scan_table[i]] = level;
817 CLOSE_READER(re, &s->gb);
821 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
823 i = 63; /* XXX: not optimal */
826 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
827 s->block_last_index[n] = i;
832 int ff_msmpeg4_decode_motion(MpegEncContext * s,
833 int *mx_ptr, int *my_ptr)
838 mv = &ff_mv_tables[s->mv_table_index];
840 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
842 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
846 mx = get_bits(&s->gb, 6);
847 my = get_bits(&s->gb, 6);
849 mx = mv->table_mvx[code];
850 my = mv->table_mvy[code];
855 /* WARNING : they do not do exactly modulo encoding */
870 AVCodec ff_msmpeg4v1_decoder = {
872 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
873 .type = AVMEDIA_TYPE_VIDEO,
874 .id = AV_CODEC_ID_MSMPEG4V1,
875 .priv_data_size = sizeof(MpegEncContext),
876 .init = ff_msmpeg4_decode_init,
877 .close = ff_h263_decode_end,
878 .decode = ff_h263_decode_frame,
879 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
880 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
882 .pix_fmts = (const enum AVPixelFormat[]) {
888 AVCodec ff_msmpeg4v2_decoder = {
890 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
891 .type = AVMEDIA_TYPE_VIDEO,
892 .id = AV_CODEC_ID_MSMPEG4V2,
893 .priv_data_size = sizeof(MpegEncContext),
894 .init = ff_msmpeg4_decode_init,
895 .close = ff_h263_decode_end,
896 .decode = ff_h263_decode_frame,
897 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
898 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
900 .pix_fmts = (const enum AVPixelFormat[]) {
906 AVCodec ff_msmpeg4v3_decoder = {
908 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
909 .type = AVMEDIA_TYPE_VIDEO,
910 .id = AV_CODEC_ID_MSMPEG4V3,
911 .priv_data_size = sizeof(MpegEncContext),
912 .init = ff_msmpeg4_decode_init,
913 .close = ff_h263_decode_end,
914 .decode = ff_h263_decode_frame,
915 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
916 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
918 .pix_fmts = (const enum AVPixelFormat[]) {
924 AVCodec ff_wmv1_decoder = {
926 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
927 .type = AVMEDIA_TYPE_VIDEO,
928 .id = AV_CODEC_ID_WMV1,
929 .priv_data_size = sizeof(MpegEncContext),
930 .init = ff_msmpeg4_decode_init,
931 .close = ff_h263_decode_end,
932 .decode = ff_h263_decode_frame,
933 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
934 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
936 .pix_fmts = (const enum AVPixelFormat[]) {