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 (get_bits_left(&s->gb) <= 0)
212 return AVERROR_INVALIDDATA;
214 if (s->pict_type == AV_PICTURE_TYPE_P) {
215 if (s->use_skip_mb_code) {
216 if (get_bits1(&s->gb)) {
220 s->block_last_index[i] = -1;
221 s->mv_dir = MV_DIR_FORWARD;
222 s->mv_type = MV_TYPE_16X16;
226 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
232 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
235 //s->mb_intra = (code & 0x40) ? 0 : 1;
236 s->mb_intra = (~code & 0x40) >> 6;
241 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
244 /* predict coded block pattern */
247 int val = ((code >> (5 - i)) & 1);
249 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
253 cbp |= val << (5 - i);
259 if(s->per_mb_rl_table && cbp){
260 s->rl_table_index = decode012(&s->gb);
261 s->rl_chroma_table_index = s->rl_table_index;
263 ff_h263_pred_motion(s, 0, 0, &mx, &my);
264 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
266 s->mv_dir = MV_DIR_FORWARD;
267 s->mv_type = MV_TYPE_16X16;
270 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
272 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
273 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
274 show_bits(&s->gb, 24));
275 s->ac_pred = get_bits1(&s->gb);
276 *mb_type_ptr = MB_TYPE_INTRA;
277 if(s->inter_intra_pred){
278 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
279 ff_dlog(s, "%d%d %d %d/",
280 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
282 if(s->per_mb_rl_table && cbp){
283 s->rl_table_index = decode012(&s->gb);
284 s->rl_chroma_table_index = s->rl_table_index;
288 s->bdsp.clear_blocks(s->block[0]);
289 for (i = 0; i < 6; i++) {
290 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
292 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
300 /* init all vlc decoding tables */
301 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
303 MpegEncContext *s = avctx->priv_data;
304 static volatile int done = 0;
308 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
311 if (ff_h263_decode_init(avctx) < 0)
314 ff_msmpeg4_common_init(s);
317 for(i=0;i<NB_RL_TABLES;i++) {
318 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
320 INIT_VLC_RL(ff_rl_table[0], 642);
321 INIT_VLC_RL(ff_rl_table[1], 1104);
322 INIT_VLC_RL(ff_rl_table[2], 554);
323 INIT_VLC_RL(ff_rl_table[3], 940);
324 INIT_VLC_RL(ff_rl_table[4], 962);
325 INIT_VLC_RL(ff_rl_table[5], 554);
327 mv = &ff_mv_tables[0];
328 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
329 mv->table_mv_bits, 1, 1,
330 mv->table_mv_code, 2, 2, 3714);
331 mv = &ff_mv_tables[1];
332 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
333 mv->table_mv_bits, 1, 1,
334 mv->table_mv_code, 2, 2, 2694);
336 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
337 &ff_table0_dc_lum[0][1], 8, 4,
338 &ff_table0_dc_lum[0][0], 8, 4, 1158);
339 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
340 &ff_table0_dc_chroma[0][1], 8, 4,
341 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
342 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
343 &ff_table1_dc_lum[0][1], 8, 4,
344 &ff_table1_dc_lum[0][0], 8, 4, 1476);
345 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
346 &ff_table1_dc_chroma[0][1], 8, 4,
347 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
349 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
350 &ff_v2_dc_lum_table[0][1], 8, 4,
351 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
352 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
353 &ff_v2_dc_chroma_table[0][1], 8, 4,
354 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
356 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
357 &ff_v2_intra_cbpc[0][1], 2, 1,
358 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
359 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
360 &ff_v2_mb_type[0][1], 2, 1,
361 &ff_v2_mb_type[0][0], 2, 1, 128);
362 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
363 &ff_mvtab[0][1], 2, 1,
364 &ff_mvtab[0][0], 2, 1, 538);
366 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
367 &ff_wmv2_inter_table[0][0][1], 8, 4,
368 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
369 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
370 &ff_wmv2_inter_table[1][0][1], 8, 4,
371 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
372 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
373 &ff_wmv2_inter_table[2][0][1], 8, 4,
374 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
375 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
376 &ff_wmv2_inter_table[3][0][1], 8, 4,
377 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
379 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
380 &ff_msmp4_mb_i_table[0][1], 4, 2,
381 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
383 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
384 &ff_table_inter_intra[0][1], 2, 1,
385 &ff_table_inter_intra[0][0], 2, 1, 8);
389 switch(s->msmpeg4_version){
392 s->decode_mb= msmpeg4v12_decode_mb;
396 s->decode_mb= msmpeg4v34_decode_mb;
399 if (CONFIG_WMV2_DECODER)
400 s->decode_mb= ff_wmv2_decode_mb;
402 //FIXME + TODO VC1 decode mb
406 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
411 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
415 // at minimum one bit per macroblock is required at least in a valid frame,
416 // we discard frames much smaller than this. Frames smaller than 1/8 of the
417 // smallest "black/skip" frame generally contain not much recoverable content
418 // while at the same time they have the highest computational requirements
420 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
421 return AVERROR_INVALIDDATA;
423 if(s->msmpeg4_version==1){
424 int start_code = get_bits_long(&s->gb, 32);
425 if(start_code!=0x00000100){
426 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
430 skip_bits(&s->gb, 5); // frame number */
433 s->pict_type = get_bits(&s->gb, 2) + 1;
434 if (s->pict_type != AV_PICTURE_TYPE_I &&
435 s->pict_type != AV_PICTURE_TYPE_P){
436 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
439 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
441 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
445 if (s->pict_type == AV_PICTURE_TYPE_I) {
446 code = get_bits(&s->gb, 5);
447 if(s->msmpeg4_version==1){
448 if(code==0 || code>s->mb_height){
449 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
453 s->slice_height = code;
455 /* 0x17: one slice, 0x18: two slices, ... */
457 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
461 s->slice_height = s->mb_height / (code - 0x16);
464 switch(s->msmpeg4_version){
467 s->rl_chroma_table_index = 2;
468 s->rl_table_index = 2;
470 s->dc_table_index = 0; //not used
473 s->rl_chroma_table_index = decode012(&s->gb);
474 s->rl_table_index = decode012(&s->gb);
476 s->dc_table_index = get_bits1(&s->gb);
479 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
481 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
482 else s->per_mb_rl_table= 0;
484 if(!s->per_mb_rl_table){
485 s->rl_chroma_table_index = decode012(&s->gb);
486 s->rl_table_index = decode012(&s->gb);
489 s->dc_table_index = get_bits1(&s->gb);
490 s->inter_intra_pred= 0;
494 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
495 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
497 s->rl_chroma_table_index,
503 switch(s->msmpeg4_version){
506 if(s->msmpeg4_version==1)
507 s->use_skip_mb_code = 1;
509 s->use_skip_mb_code = get_bits1(&s->gb);
510 s->rl_table_index = 2;
511 s->rl_chroma_table_index = s->rl_table_index;
512 s->dc_table_index = 0; //not used
513 s->mv_table_index = 0;
516 s->use_skip_mb_code = get_bits1(&s->gb);
517 s->rl_table_index = decode012(&s->gb);
518 s->rl_chroma_table_index = s->rl_table_index;
520 s->dc_table_index = get_bits1(&s->gb);
522 s->mv_table_index = get_bits1(&s->gb);
525 s->use_skip_mb_code = get_bits1(&s->gb);
527 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
528 else s->per_mb_rl_table= 0;
530 if(!s->per_mb_rl_table){
531 s->rl_table_index = decode012(&s->gb);
532 s->rl_chroma_table_index = s->rl_table_index;
535 s->dc_table_index = get_bits1(&s->gb);
537 s->mv_table_index = get_bits1(&s->gb);
538 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
542 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
543 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
546 s->rl_chroma_table_index,
552 if(s->flipflop_rounding){
558 ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
559 s->inter_intra_pred, s->width, s->height);
561 s->esc3_level_length= 0;
562 s->esc3_run_length= 0;
567 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
569 int left= buf_size*8 - get_bits_count(&s->gb);
570 int length= s->msmpeg4_version>=3 ? 17 : 16;
571 /* the alt_bitstream reader could read over the end so we need to check it */
572 if(left>=length && left<length+8)
574 skip_bits(&s->gb, 5); /* fps */
575 s->bit_rate= get_bits(&s->gb, 11)*1024;
576 if(s->msmpeg4_version>=3)
577 s->flipflop_rounding= get_bits1(&s->gb);
579 s->flipflop_rounding= 0;
581 else if(left<length+8)
583 s->flipflop_rounding= 0;
584 if(s->msmpeg4_version != 2)
585 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
589 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
595 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
599 if(s->msmpeg4_version<=2){
601 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
603 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
606 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
611 }else{ //FIXME optimize use unified tables & index
613 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
615 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
618 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
623 if (level == DC_MAX) {
624 level = get_bits(&s->gb, 8);
625 if (get_bits1(&s->gb))
627 } else if (level != 0) {
628 if (get_bits1(&s->gb))
633 if(s->msmpeg4_version==1){
635 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
638 /* update predictor */
642 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
645 /* update predictor */
647 *dc_val = level * s->y_dc_scale;
649 *dc_val = level * s->c_dc_scale;
656 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
657 int n, int coded, const uint8_t *scan_table)
659 int level, i, last, run, run_diff;
660 int av_uninit(dc_pred_dir);
670 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
673 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
674 if(s->inter_intra_pred) level=0;
677 rl = &ff_rl_table[s->rl_table_index];
678 if(level > 256*s->y_dc_scale){
679 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
680 if(!s->inter_intra_pred) return -1;
683 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
684 if(level > 256*s->c_dc_scale){
685 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
686 if(!s->inter_intra_pred) return -1;
691 run_diff = s->msmpeg4_version >= 4;
697 if (dc_pred_dir == 0)
698 scan_table = s->intra_v_scantable.permutated; /* left */
700 scan_table = s->intra_h_scantable.permutated; /* top */
702 scan_table = s->intra_scantable.permutated;
704 rl_vlc= rl->rl_vlc[0];
706 qmul = s->qscale << 1;
707 qadd = (s->qscale - 1) | 1;
709 rl = &ff_rl_table[3 + s->rl_table_index];
711 if(s->msmpeg4_version==2)
717 s->block_last_index[n] = i;
721 scan_table = s->inter_scantable.permutated;
722 rl_vlc= rl->rl_vlc[s->qscale];
725 OPEN_READER(re, &s->gb);
727 UPDATE_CACHE(re, &s->gb);
728 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
731 cache= GET_CACHE(re, &s->gb);
733 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
734 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
736 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
737 UPDATE_CACHE(re, &s->gb);
738 if(s->msmpeg4_version<=3){
739 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
740 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
741 level= SHOW_SBITS(re, &s->gb, 8);
742 SKIP_COUNTER(re, &s->gb, 1+6+8);
745 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
746 if(!s->esc3_level_length){
748 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
749 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
751 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
753 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
757 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
759 SKIP_BITS(re, &s->gb, 1);
761 if(ll<8) SKIP_BITS(re, &s->gb, 1);
764 s->esc3_level_length= ll;
765 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
766 UPDATE_CACHE(re, &s->gb);
768 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
769 SKIP_BITS(re, &s->gb, s->esc3_run_length);
771 sign= SHOW_UBITS(re, &s->gb, 1);
772 SKIP_BITS(re, &s->gb, 1);
774 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
775 SKIP_BITS(re, &s->gb, s->esc3_level_length);
776 if(sign) level= -level;
779 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
780 if (level>0) level= level * qmul + qadd;
781 else level= level * qmul - qadd;
786 SKIP_BITS(re, &s->gb, 2);
787 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
788 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
789 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
790 LAST_SKIP_BITS(re, &s->gb, 1);
794 SKIP_BITS(re, &s->gb, 1);
795 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
797 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//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);
803 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
804 LAST_SKIP_BITS(re, &s->gb, 1);
809 const int left= get_bits_left(&s->gb);
810 if (((i + 192 == 64 && level / qmul == -1) ||
811 !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
813 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
817 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
822 block[scan_table[i]] = level;
826 block[scan_table[i]] = level;
828 CLOSE_READER(re, &s->gb);
832 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
834 i = 63; /* XXX: not optimal */
837 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
838 s->block_last_index[n] = i;
843 int ff_msmpeg4_decode_motion(MpegEncContext * s,
844 int *mx_ptr, int *my_ptr)
849 mv = &ff_mv_tables[s->mv_table_index];
851 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
853 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
857 mx = get_bits(&s->gb, 6);
858 my = get_bits(&s->gb, 6);
860 mx = mv->table_mvx[code];
861 my = mv->table_mvy[code];
866 /* WARNING : they do not do exactly modulo encoding */
881 AVCodec ff_msmpeg4v1_decoder = {
883 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
884 .type = AVMEDIA_TYPE_VIDEO,
885 .id = AV_CODEC_ID_MSMPEG4V1,
886 .priv_data_size = sizeof(MpegEncContext),
887 .init = ff_msmpeg4_decode_init,
888 .close = ff_h263_decode_end,
889 .decode = ff_h263_decode_frame,
890 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
891 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
893 .pix_fmts = (const enum AVPixelFormat[]) {
899 AVCodec ff_msmpeg4v2_decoder = {
901 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
902 .type = AVMEDIA_TYPE_VIDEO,
903 .id = AV_CODEC_ID_MSMPEG4V2,
904 .priv_data_size = sizeof(MpegEncContext),
905 .init = ff_msmpeg4_decode_init,
906 .close = ff_h263_decode_end,
907 .decode = ff_h263_decode_frame,
908 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
909 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
911 .pix_fmts = (const enum AVPixelFormat[]) {
917 AVCodec ff_msmpeg4v3_decoder = {
919 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
920 .type = AVMEDIA_TYPE_VIDEO,
921 .id = AV_CODEC_ID_MSMPEG4V3,
922 .priv_data_size = sizeof(MpegEncContext),
923 .init = ff_msmpeg4_decode_init,
924 .close = ff_h263_decode_end,
925 .decode = ff_h263_decode_frame,
926 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
927 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
929 .pix_fmts = (const enum AVPixelFormat[]) {
935 AVCodec ff_wmv1_decoder = {
937 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
938 .type = AVMEDIA_TYPE_VIDEO,
939 .id = AV_CODEC_ID_WMV1,
940 .priv_data_size = sizeof(MpegEncContext),
941 .init = ff_msmpeg4_decode_init,
942 .close = ff_h263_decode_end,
943 .decode = ff_h263_decode_frame,
944 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
945 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
947 .pix_fmts = (const enum AVPixelFormat[]) {