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 TEX_VLC_BITS 9
43 #define DEFAULT_INTER_INDEX 3
45 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
56 *dc_val_ptr= &s->last_dc[i];
60 /****************************************/
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 VLC ff_inter_intra_vlc;
70 /* This is identical to H.263 except that its range is multiplied by 2. */
71 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
73 int code, val, sign, shift;
75 code = get_vlc2(&s->gb, ff_h263_mv_vlc.table, H263_MV_VLC_BITS, 2);
76 ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
82 sign = get_bits1(&s->gb);
86 val = (val - 1) << shift;
87 val |= get_bits(&s->gb, shift);
102 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
105 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
107 if (s->pict_type == AV_PICTURE_TYPE_P) {
108 if (s->use_skip_mb_code) {
109 if (get_bits1(&s->gb)) {
113 s->block_last_index[i] = -1;
114 s->mv_dir = MV_DIR_FORWARD;
115 s->mv_type = MV_TYPE_16X16;
119 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_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, 2);
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;
168 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
171 if(s->msmpeg4_version==2){
172 s->ac_pred = get_bits1(&s->gb);
173 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
175 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
181 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
183 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
187 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
189 *mb_type_ptr = MB_TYPE_INTRA;
192 s->bdsp.clear_blocks(s->block[0]);
193 for (i = 0; i < 6; i++) {
194 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
196 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
203 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
207 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
209 if (get_bits_left(&s->gb) <= 0)
210 return AVERROR_INVALIDDATA;
212 if (s->pict_type == AV_PICTURE_TYPE_P) {
213 if (s->use_skip_mb_code) {
214 if (get_bits1(&s->gb)) {
218 s->block_last_index[i] = -1;
219 s->mv_dir = MV_DIR_FORWARD;
220 s->mv_type = MV_TYPE_16X16;
224 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
230 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
231 //s->mb_intra = (code & 0x40) ? 0 : 1;
232 s->mb_intra = (~code & 0x40) >> 6;
237 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
238 /* predict coded block pattern */
241 int val = ((code >> (5 - i)) & 1);
243 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
247 cbp |= val << (5 - i);
253 if(s->per_mb_rl_table && cbp){
254 s->rl_table_index = decode012(&s->gb);
255 s->rl_chroma_table_index = s->rl_table_index;
257 ff_h263_pred_motion(s, 0, 0, &mx, &my);
258 ff_msmpeg4_decode_motion(s, &mx, &my);
259 s->mv_dir = MV_DIR_FORWARD;
260 s->mv_type = MV_TYPE_16X16;
263 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
265 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
266 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
267 show_bits(&s->gb, 24));
268 s->ac_pred = get_bits1(&s->gb);
269 *mb_type_ptr = MB_TYPE_INTRA;
270 if(s->inter_intra_pred){
271 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
272 ff_dlog(s, "%d%d %d %d/",
273 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
275 if(s->per_mb_rl_table && cbp){
276 s->rl_table_index = decode012(&s->gb);
277 s->rl_chroma_table_index = s->rl_table_index;
281 s->bdsp.clear_blocks(s->block[0]);
282 for (i = 0; i < 6; i++) {
283 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
285 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
293 /* init all vlc decoding tables */
294 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
296 MpegEncContext *s = avctx->priv_data;
297 static volatile int done = 0;
301 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
304 if (ff_h263_decode_init(avctx) < 0)
307 ff_msmpeg4_common_init(s);
310 INIT_FIRST_VLC_RL(ff_rl_table[0], 642);
311 INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
312 INIT_FIRST_VLC_RL(ff_rl_table[2], 554);
313 INIT_VLC_RL(ff_rl_table[3], 940);
314 INIT_VLC_RL(ff_rl_table[4], 962);
315 /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been
316 * initialized in ff_h263_decode_init() above. So just copy the VLCs. */
317 av_assert1(ff_h263_rl_inter.rl_vlc[0]);
318 memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc));
320 mv = &ff_mv_tables[0];
321 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1,
322 mv->table_mv_bits, 1, 1,
323 mv->table_mv_code, 2, 2, 3714);
324 mv = &ff_mv_tables[1];
325 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1,
326 mv->table_mv_bits, 1, 1,
327 mv->table_mv_code, 2, 2, 2694);
329 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
330 &ff_table0_dc_lum[0][1], 8, 4,
331 &ff_table0_dc_lum[0][0], 8, 4, 1158);
332 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
333 &ff_table0_dc_chroma[0][1], 8, 4,
334 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
335 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
336 &ff_table1_dc_lum[0][1], 8, 4,
337 &ff_table1_dc_lum[0][0], 8, 4, 1476);
338 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
339 &ff_table1_dc_chroma[0][1], 8, 4,
340 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
342 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
343 &ff_v2_dc_lum_table[0][1], 8, 4,
344 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
345 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
346 &ff_v2_dc_chroma_table[0][1], 8, 4,
347 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
349 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
350 &ff_v2_intra_cbpc[0][1], 2, 1,
351 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
352 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
353 &ff_v2_mb_type[0][1], 2, 1,
354 &ff_v2_mb_type[0][0], 2, 1, 128);
356 for (unsigned i = 0, offset = 0; i < 4; i++) {
357 static VLC_TYPE vlc_buf[1636 + 2648 + 1532 + 2488][2];
358 ff_mb_non_intra_vlc[i].table = &vlc_buf[offset];
359 ff_mb_non_intra_vlc[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
360 init_vlc(&ff_mb_non_intra_vlc[i], MB_NON_INTRA_VLC_BITS, 128,
361 &ff_wmv2_inter_table[i][0][1], 8, 4,
362 &ff_wmv2_inter_table[i][0][0], 8, 4,
363 INIT_VLC_STATIC_OVERLONG);
364 offset += ff_mb_non_intra_vlc[i].table_size;
367 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
368 &ff_msmp4_mb_i_table[0][1], 4, 2,
369 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
371 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
372 &ff_table_inter_intra[0][1], 2, 1,
373 &ff_table_inter_intra[0][0], 2, 1, 8);
377 switch(s->msmpeg4_version){
380 s->decode_mb= msmpeg4v12_decode_mb;
384 s->decode_mb= msmpeg4v34_decode_mb;
387 if (CONFIG_WMV2_DECODER)
388 s->decode_mb= ff_wmv2_decode_mb;
390 //FIXME + TODO VC1 decode mb
394 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
399 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
403 // at minimum one bit per macroblock is required at least in a valid frame,
404 // we discard frames much smaller than this. Frames smaller than 1/8 of the
405 // smallest "black/skip" frame generally contain not much recoverable content
406 // while at the same time they have the highest computational requirements
408 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
409 return AVERROR_INVALIDDATA;
411 if(s->msmpeg4_version==1){
412 int start_code = get_bits_long(&s->gb, 32);
413 if(start_code!=0x00000100){
414 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
418 skip_bits(&s->gb, 5); // frame number */
421 s->pict_type = get_bits(&s->gb, 2) + 1;
422 if (s->pict_type != AV_PICTURE_TYPE_I &&
423 s->pict_type != AV_PICTURE_TYPE_P){
424 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
427 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
429 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
433 if (s->pict_type == AV_PICTURE_TYPE_I) {
434 code = get_bits(&s->gb, 5);
435 if(s->msmpeg4_version==1){
436 if(code==0 || code>s->mb_height){
437 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
441 s->slice_height = code;
443 /* 0x17: one slice, 0x18: two slices, ... */
445 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
449 s->slice_height = s->mb_height / (code - 0x16);
452 switch(s->msmpeg4_version){
455 s->rl_chroma_table_index = 2;
456 s->rl_table_index = 2;
458 s->dc_table_index = 0; //not used
461 s->rl_chroma_table_index = decode012(&s->gb);
462 s->rl_table_index = decode012(&s->gb);
464 s->dc_table_index = get_bits1(&s->gb);
467 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
469 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
470 else s->per_mb_rl_table= 0;
472 if(!s->per_mb_rl_table){
473 s->rl_chroma_table_index = decode012(&s->gb);
474 s->rl_table_index = decode012(&s->gb);
477 s->dc_table_index = get_bits1(&s->gb);
478 s->inter_intra_pred= 0;
482 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
483 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
485 s->rl_chroma_table_index,
491 switch(s->msmpeg4_version){
494 if(s->msmpeg4_version==1)
495 s->use_skip_mb_code = 1;
497 s->use_skip_mb_code = get_bits1(&s->gb);
498 s->rl_table_index = 2;
499 s->rl_chroma_table_index = s->rl_table_index;
500 s->dc_table_index = 0; //not used
501 s->mv_table_index = 0;
504 s->use_skip_mb_code = get_bits1(&s->gb);
505 s->rl_table_index = decode012(&s->gb);
506 s->rl_chroma_table_index = s->rl_table_index;
508 s->dc_table_index = get_bits1(&s->gb);
510 s->mv_table_index = get_bits1(&s->gb);
513 s->use_skip_mb_code = get_bits1(&s->gb);
515 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
516 else s->per_mb_rl_table= 0;
518 if(!s->per_mb_rl_table){
519 s->rl_table_index = decode012(&s->gb);
520 s->rl_chroma_table_index = s->rl_table_index;
523 s->dc_table_index = get_bits1(&s->gb);
525 s->mv_table_index = get_bits1(&s->gb);
526 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
530 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
531 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
534 s->rl_chroma_table_index,
540 if(s->flipflop_rounding){
546 ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
547 s->inter_intra_pred, s->width, s->height);
549 s->esc3_level_length= 0;
550 s->esc3_run_length= 0;
555 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
557 int left= buf_size*8 - get_bits_count(&s->gb);
558 int length= s->msmpeg4_version>=3 ? 17 : 16;
559 /* the alt_bitstream reader could read over the end so we need to check it */
560 if(left>=length && left<length+8)
562 skip_bits(&s->gb, 5); /* fps */
563 s->bit_rate= get_bits(&s->gb, 11)*1024;
564 if(s->msmpeg4_version>=3)
565 s->flipflop_rounding= get_bits1(&s->gb);
567 s->flipflop_rounding= 0;
569 else if(left<length+8)
571 s->flipflop_rounding= 0;
572 if(s->msmpeg4_version != 2)
573 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
577 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
583 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
587 if(s->msmpeg4_version<=2){
589 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
591 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
594 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
599 }else{ //FIXME optimize use unified tables & index
601 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
603 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
606 if (level == DC_MAX) {
607 level = get_bits(&s->gb, 8);
608 if (get_bits1(&s->gb))
610 } else if (level != 0) {
611 if (get_bits1(&s->gb))
616 if(s->msmpeg4_version==1){
618 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
621 /* update predictor */
625 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
628 /* update predictor */
630 *dc_val = level * s->y_dc_scale;
632 *dc_val = level * s->c_dc_scale;
639 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
640 int n, int coded, const uint8_t *scan_table)
642 int level, i, last, run, run_diff;
643 int av_uninit(dc_pred_dir);
653 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
656 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
657 if(s->inter_intra_pred) level=0;
660 rl = &ff_rl_table[s->rl_table_index];
661 if(level > 256*s->y_dc_scale){
662 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
663 if(!s->inter_intra_pred) return -1;
666 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
667 if(level > 256*s->c_dc_scale){
668 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
669 if(!s->inter_intra_pred) return -1;
674 run_diff = s->msmpeg4_version >= 4;
680 if (dc_pred_dir == 0)
681 scan_table = s->intra_v_scantable.permutated; /* left */
683 scan_table = s->intra_h_scantable.permutated; /* top */
685 scan_table = s->intra_scantable.permutated;
687 rl_vlc= rl->rl_vlc[0];
689 qmul = s->qscale << 1;
690 qadd = (s->qscale - 1) | 1;
692 rl = &ff_rl_table[3 + s->rl_table_index];
694 if(s->msmpeg4_version==2)
700 s->block_last_index[n] = i;
704 scan_table = s->inter_scantable.permutated;
705 rl_vlc= rl->rl_vlc[s->qscale];
708 OPEN_READER(re, &s->gb);
710 UPDATE_CACHE(re, &s->gb);
711 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
714 cache= GET_CACHE(re, &s->gb);
716 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
717 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
719 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
720 UPDATE_CACHE(re, &s->gb);
721 if(s->msmpeg4_version<=3){
722 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
723 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
724 level= SHOW_SBITS(re, &s->gb, 8);
725 SKIP_COUNTER(re, &s->gb, 1+6+8);
728 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
729 if(!s->esc3_level_length){
731 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
732 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
734 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
736 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
740 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
742 SKIP_BITS(re, &s->gb, 1);
744 if(ll<8) SKIP_BITS(re, &s->gb, 1);
747 s->esc3_level_length= ll;
748 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
749 UPDATE_CACHE(re, &s->gb);
751 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
752 SKIP_BITS(re, &s->gb, s->esc3_run_length);
754 sign= SHOW_UBITS(re, &s->gb, 1);
755 SKIP_BITS(re, &s->gb, 1);
757 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
758 SKIP_BITS(re, &s->gb, s->esc3_level_length);
759 if(sign) level= -level;
762 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
763 if (level>0) level= level * qmul + qadd;
764 else level= level * qmul - qadd;
769 SKIP_BITS(re, &s->gb, 2);
770 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
771 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
772 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
773 LAST_SKIP_BITS(re, &s->gb, 1);
777 SKIP_BITS(re, &s->gb, 1);
778 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
780 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
781 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
782 LAST_SKIP_BITS(re, &s->gb, 1);
786 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
787 LAST_SKIP_BITS(re, &s->gb, 1);
792 const int left= get_bits_left(&s->gb);
793 if (((i + 192 == 64 && level / qmul == -1) ||
794 !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
796 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
800 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
805 block[scan_table[i]] = level;
809 block[scan_table[i]] = level;
811 CLOSE_READER(re, &s->gb);
815 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
817 i = 63; /* XXX: not optimal */
820 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
821 s->block_last_index[n] = i;
826 void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
831 mv = &ff_mv_tables[s->mv_table_index];
833 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
834 if (code == MSMPEG4_MV_TABLES_NB_ELEMS) {
835 mx = get_bits(&s->gb, 6);
836 my = get_bits(&s->gb, 6);
838 mx = mv->table_mvx[code];
839 my = mv->table_mvy[code];
844 /* WARNING : they do not do exactly modulo encoding */
858 AVCodec ff_msmpeg4v1_decoder = {
860 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
861 .type = AVMEDIA_TYPE_VIDEO,
862 .id = AV_CODEC_ID_MSMPEG4V1,
863 .priv_data_size = sizeof(MpegEncContext),
864 .init = ff_msmpeg4_decode_init,
865 .close = ff_h263_decode_end,
866 .decode = ff_h263_decode_frame,
867 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
868 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
870 .pix_fmts = (const enum AVPixelFormat[]) {
876 AVCodec ff_msmpeg4v2_decoder = {
878 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
879 .type = AVMEDIA_TYPE_VIDEO,
880 .id = AV_CODEC_ID_MSMPEG4V2,
881 .priv_data_size = sizeof(MpegEncContext),
882 .init = ff_msmpeg4_decode_init,
883 .close = ff_h263_decode_end,
884 .decode = ff_h263_decode_frame,
885 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
886 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
888 .pix_fmts = (const enum AVPixelFormat[]) {
894 AVCodec ff_msmpeg4v3_decoder = {
896 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
897 .type = AVMEDIA_TYPE_VIDEO,
898 .id = AV_CODEC_ID_MSMPEG4V3,
899 .priv_data_size = sizeof(MpegEncContext),
900 .init = ff_msmpeg4_decode_init,
901 .close = ff_h263_decode_end,
902 .decode = ff_h263_decode_frame,
903 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
904 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
906 .pix_fmts = (const enum AVPixelFormat[]) {
912 AVCodec ff_wmv1_decoder = {
914 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
915 .type = AVMEDIA_TYPE_VIDEO,
916 .id = AV_CODEC_ID_WMV1,
917 .priv_data_size = sizeof(MpegEncContext),
918 .init = ff_msmpeg4_decode_init,
919 .close = ff_h263_decode_end,
920 .decode = ff_h263_decode_frame,
921 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
922 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
924 .pix_fmts = (const enum AVPixelFormat[]) {