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"
31 #include "libavutil/x86/asm.h"
33 #include "mpeg4video.h"
34 #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 h263 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 av_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, 1);
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;
172 if(s->msmpeg4_version==2){
173 s->ac_pred = get_bits1(&s->gb);
174 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
177 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
178 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
180 *mb_type_ptr = MB_TYPE_INTRA;
183 s->dsp.clear_blocks(s->block[0]);
184 for (i = 0; i < 6; i++) {
185 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
187 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
194 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
198 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
200 if (s->pict_type == AV_PICTURE_TYPE_P) {
201 if (s->use_skip_mb_code) {
202 if (get_bits1(&s->gb)) {
206 s->block_last_index[i] = -1;
207 s->mv_dir = MV_DIR_FORWARD;
208 s->mv_type = MV_TYPE_16X16;
212 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
218 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
221 //s->mb_intra = (code & 0x40) ? 0 : 1;
222 s->mb_intra = (~code & 0x40) >> 6;
227 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
230 /* predict coded block pattern */
233 int val = ((code >> (5 - i)) & 1);
235 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
239 cbp |= val << (5 - i);
245 if(s->per_mb_rl_table && cbp){
246 s->rl_table_index = decode012(&s->gb);
247 s->rl_chroma_table_index = s->rl_table_index;
249 ff_h263_pred_motion(s, 0, 0, &mx, &my);
250 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
252 s->mv_dir = MV_DIR_FORWARD;
253 s->mv_type = MV_TYPE_16X16;
256 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
258 av_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
259 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
260 show_bits(&s->gb, 24));
261 s->ac_pred = get_bits1(&s->gb);
262 *mb_type_ptr = MB_TYPE_INTRA;
263 if(s->inter_intra_pred){
264 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
265 av_dlog(s, "%d%d %d %d/",
266 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
268 if(s->per_mb_rl_table && cbp){
269 s->rl_table_index = decode012(&s->gb);
270 s->rl_chroma_table_index = s->rl_table_index;
274 s->dsp.clear_blocks(s->block[0]);
275 for (i = 0; i < 6; i++) {
276 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
278 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
286 /* init all vlc decoding tables */
287 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
289 MpegEncContext *s = avctx->priv_data;
290 static volatile int done = 0;
294 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
297 if (ff_h263_decode_init(avctx) < 0)
300 ff_msmpeg4_common_init(s);
303 for(i=0;i<NB_RL_TABLES;i++) {
304 ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]);
306 INIT_VLC_RL(ff_rl_table[0], 642);
307 INIT_VLC_RL(ff_rl_table[1], 1104);
308 INIT_VLC_RL(ff_rl_table[2], 554);
309 INIT_VLC_RL(ff_rl_table[3], 940);
310 INIT_VLC_RL(ff_rl_table[4], 962);
311 INIT_VLC_RL(ff_rl_table[5], 554);
313 mv = &ff_mv_tables[0];
314 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
315 mv->table_mv_bits, 1, 1,
316 mv->table_mv_code, 2, 2, 3714);
317 mv = &ff_mv_tables[1];
318 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
319 mv->table_mv_bits, 1, 1,
320 mv->table_mv_code, 2, 2, 2694);
322 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
323 &ff_table0_dc_lum[0][1], 8, 4,
324 &ff_table0_dc_lum[0][0], 8, 4, 1158);
325 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
326 &ff_table0_dc_chroma[0][1], 8, 4,
327 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
328 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
329 &ff_table1_dc_lum[0][1], 8, 4,
330 &ff_table1_dc_lum[0][0], 8, 4, 1476);
331 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
332 &ff_table1_dc_chroma[0][1], 8, 4,
333 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
335 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
336 &ff_v2_dc_lum_table[0][1], 8, 4,
337 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
338 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
339 &ff_v2_dc_chroma_table[0][1], 8, 4,
340 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
342 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
343 &ff_v2_intra_cbpc[0][1], 2, 1,
344 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
345 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
346 &ff_v2_mb_type[0][1], 2, 1,
347 &ff_v2_mb_type[0][0], 2, 1, 128);
348 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
349 &ff_mvtab[0][1], 2, 1,
350 &ff_mvtab[0][0], 2, 1, 538);
352 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
353 &ff_wmv2_inter_table[0][0][1], 8, 4,
354 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
355 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
356 &ff_wmv2_inter_table[1][0][1], 8, 4,
357 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
358 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
359 &ff_wmv2_inter_table[2][0][1], 8, 4,
360 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
361 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
362 &ff_wmv2_inter_table[3][0][1], 8, 4,
363 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
365 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
366 &ff_msmp4_mb_i_table[0][1], 4, 2,
367 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
369 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
370 &ff_table_inter_intra[0][1], 2, 1,
371 &ff_table_inter_intra[0][0], 2, 1, 8);
375 switch(s->msmpeg4_version){
378 s->decode_mb= msmpeg4v12_decode_mb;
382 s->decode_mb= msmpeg4v34_decode_mb;
385 if (CONFIG_WMV2_DECODER)
386 s->decode_mb= ff_wmv2_decode_mb;
388 //FIXME + TODO VC1 decode mb
392 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
397 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
401 if(s->msmpeg4_version==1){
402 int start_code = get_bits_long(&s->gb, 32);
403 if(start_code!=0x00000100){
404 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
408 skip_bits(&s->gb, 5); // frame number */
411 s->pict_type = get_bits(&s->gb, 2) + 1;
412 if (s->pict_type != AV_PICTURE_TYPE_I &&
413 s->pict_type != AV_PICTURE_TYPE_P){
414 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
420 if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1;
421 if(!had_i) return -1;
424 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
426 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
430 if (s->pict_type == AV_PICTURE_TYPE_I) {
431 code = get_bits(&s->gb, 5);
432 if(s->msmpeg4_version==1){
433 if(code==0 || code>s->mb_height){
434 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
438 s->slice_height = code;
440 /* 0x17: one slice, 0x18: two slices, ... */
442 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
446 s->slice_height = s->mb_height / (code - 0x16);
449 switch(s->msmpeg4_version){
452 s->rl_chroma_table_index = 2;
453 s->rl_table_index = 2;
455 s->dc_table_index = 0; //not used
458 s->rl_chroma_table_index = decode012(&s->gb);
459 s->rl_table_index = decode012(&s->gb);
461 s->dc_table_index = get_bits1(&s->gb);
464 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
466 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
467 else s->per_mb_rl_table= 0;
469 if(!s->per_mb_rl_table){
470 s->rl_chroma_table_index = decode012(&s->gb);
471 s->rl_table_index = decode012(&s->gb);
474 s->dc_table_index = get_bits1(&s->gb);
475 s->inter_intra_pred= 0;
479 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
480 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
482 s->rl_chroma_table_index,
488 switch(s->msmpeg4_version){
491 if(s->msmpeg4_version==1)
492 s->use_skip_mb_code = 1;
494 s->use_skip_mb_code = get_bits1(&s->gb);
495 s->rl_table_index = 2;
496 s->rl_chroma_table_index = s->rl_table_index;
497 s->dc_table_index = 0; //not used
498 s->mv_table_index = 0;
501 s->use_skip_mb_code = get_bits1(&s->gb);
502 s->rl_table_index = decode012(&s->gb);
503 s->rl_chroma_table_index = s->rl_table_index;
505 s->dc_table_index = get_bits1(&s->gb);
507 s->mv_table_index = get_bits1(&s->gb);
510 s->use_skip_mb_code = get_bits1(&s->gb);
512 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
513 else s->per_mb_rl_table= 0;
515 if(!s->per_mb_rl_table){
516 s->rl_table_index = decode012(&s->gb);
517 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);
523 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
527 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
528 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
531 s->rl_chroma_table_index,
537 if(s->flipflop_rounding){
543 av_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
544 s->inter_intra_pred, s->width, s->height);
546 s->esc3_level_length= 0;
547 s->esc3_run_length= 0;
552 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
554 int left= buf_size*8 - get_bits_count(&s->gb);
555 int length= s->msmpeg4_version>=3 ? 17 : 16;
556 /* the alt_bitstream reader could read over the end so we need to check it */
557 if(left>=length && left<length+8)
559 skip_bits(&s->gb, 5); /* fps */
560 s->bit_rate= get_bits(&s->gb, 11)*1024;
561 if(s->msmpeg4_version>=3)
562 s->flipflop_rounding= get_bits1(&s->gb);
564 s->flipflop_rounding= 0;
566 else if(left<length+8)
568 s->flipflop_rounding= 0;
569 if(s->msmpeg4_version != 2)
570 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
574 av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
580 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
584 if(s->msmpeg4_version<=2){
586 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
588 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
591 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
596 }else{ //FIXME optimize use unified tables & index
598 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
600 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
603 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
608 if (level == DC_MAX) {
609 level = get_bits(&s->gb, 8);
610 if (get_bits1(&s->gb))
612 } else if (level != 0) {
613 if (get_bits1(&s->gb))
618 if(s->msmpeg4_version==1){
620 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
623 /* update predictor */
627 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
630 /* update predictor */
632 *dc_val = level * s->y_dc_scale;
634 *dc_val = level * s->c_dc_scale;
641 //#define ERROR_DETAILS
642 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
643 int n, int coded, const uint8_t *scan_table)
645 int level, i, last, run, run_diff;
646 int av_uninit(dc_pred_dir);
656 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
659 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
660 if(s->inter_intra_pred) level=0;
663 rl = &ff_rl_table[s->rl_table_index];
664 if(level > 256*s->y_dc_scale){
665 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
666 if(!s->inter_intra_pred) return -1;
669 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
670 if(level > 256*s->c_dc_scale){
671 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
672 if(!s->inter_intra_pred) return -1;
677 run_diff = s->msmpeg4_version >= 4;
683 if (dc_pred_dir == 0)
684 scan_table = s->intra_v_scantable.permutated; /* left */
686 scan_table = s->intra_h_scantable.permutated; /* top */
688 scan_table = s->intra_scantable.permutated;
690 rl_vlc= rl->rl_vlc[0];
692 qmul = s->qscale << 1;
693 qadd = (s->qscale - 1) | 1;
695 rl = &ff_rl_table[3 + s->rl_table_index];
697 if(s->msmpeg4_version==2)
703 s->block_last_index[n] = i;
707 scan_table = s->inter_scantable.permutated;
708 rl_vlc= rl->rl_vlc[s->qscale];
711 OPEN_READER(re, &s->gb);
713 UPDATE_CACHE(re, &s->gb);
714 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
717 cache= GET_CACHE(re, &s->gb);
719 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
720 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
722 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
723 UPDATE_CACHE(re, &s->gb);
724 if(s->msmpeg4_version<=3){
725 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
726 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
727 level= SHOW_SBITS(re, &s->gb, 8);
728 SKIP_COUNTER(re, &s->gb, 1+6+8);
731 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
732 if(!s->esc3_level_length){
734 av_dlog(s->avctx, "ESC-3 %X at %d %d\n",
735 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
737 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
739 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
743 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
745 SKIP_BITS(re, &s->gb, 1);
747 if(ll<8) SKIP_BITS(re, &s->gb, 1);
750 s->esc3_level_length= ll;
751 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
752 UPDATE_CACHE(re, &s->gb);
754 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
755 SKIP_BITS(re, &s->gb, s->esc3_run_length);
757 sign= SHOW_UBITS(re, &s->gb, 1);
758 SKIP_BITS(re, &s->gb, 1);
760 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
761 SKIP_BITS(re, &s->gb, s->esc3_level_length);
762 if(sign) level= -level;
765 #if 0 // waste of time / this will detect very few errors
767 const int abs_level= FFABS(level);
768 const int run1= run - rl->max_run[last][abs_level] - run_diff;
769 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
770 if(abs_level <= rl->max_level[last][run]){
771 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
772 return DECODING_AC_LOST;
774 if(abs_level <= rl->max_level[last][run]*2){
775 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
776 return DECODING_AC_LOST;
778 if(run1>=0 && abs_level <= rl->max_level[last][run1]){
779 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
780 return DECODING_AC_LOST;
785 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
786 if (level>0) level= level * qmul + qadd;
787 else level= level * qmul - qadd;
788 #if 0 // waste of time too :(
789 if(level>2048 || level<-2048){
790 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n");
791 return DECODING_AC_LOST;
798 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level);
799 else if((i>62 && i<192) || i>192+63)
800 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
804 SKIP_BITS(re, &s->gb, 2);
805 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
806 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
807 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
808 LAST_SKIP_BITS(re, &s->gb, 1);
811 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level);
812 else if((i>62 && i<192) || i>192+63)
813 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
818 SKIP_BITS(re, &s->gb, 1);
819 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
821 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
822 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
823 LAST_SKIP_BITS(re, &s->gb, 1);
826 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level);
827 else if((i>62 && i<192) || i>192+63)
828 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
833 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
834 LAST_SKIP_BITS(re, &s->gb, 1);
837 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level);
838 else if((i>62 && i<192) || i>192+63)
839 av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level);
845 const int left= get_bits_left(&s->gb);
846 if(((i+192 == 64 && level/qmul==-1) || !(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT))) && left>=0){
847 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
851 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
856 block[scan_table[i]] = level;
860 block[scan_table[i]] = level;
862 CLOSE_READER(re, &s->gb);
866 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
868 i = 63; /* XXX: not optimal */
871 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
872 s->block_last_index[n] = i;
877 int ff_msmpeg4_decode_motion(MpegEncContext * s,
878 int *mx_ptr, int *my_ptr)
883 mv = &ff_mv_tables[s->mv_table_index];
885 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
887 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
891 mx = get_bits(&s->gb, 6);
892 my = get_bits(&s->gb, 6);
894 mx = mv->table_mvx[code];
895 my = mv->table_mvy[code];
900 /* WARNING : they do not do exactly modulo encoding */
915 AVCodec ff_msmpeg4v1_decoder = {
917 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
918 .type = AVMEDIA_TYPE_VIDEO,
919 .id = AV_CODEC_ID_MSMPEG4V1,
920 .priv_data_size = sizeof(MpegEncContext),
921 .init = ff_msmpeg4_decode_init,
922 .close = ff_h263_decode_end,
923 .decode = ff_h263_decode_frame,
924 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
926 .pix_fmts = ff_pixfmt_list_420,
929 AVCodec ff_msmpeg4v2_decoder = {
931 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
932 .type = AVMEDIA_TYPE_VIDEO,
933 .id = AV_CODEC_ID_MSMPEG4V2,
934 .priv_data_size = sizeof(MpegEncContext),
935 .init = ff_msmpeg4_decode_init,
936 .close = ff_h263_decode_end,
937 .decode = ff_h263_decode_frame,
938 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
940 .pix_fmts = ff_pixfmt_list_420,
943 AVCodec ff_msmpeg4v3_decoder = {
945 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
946 .type = AVMEDIA_TYPE_VIDEO,
947 .id = AV_CODEC_ID_MSMPEG4V3,
948 .priv_data_size = sizeof(MpegEncContext),
949 .init = ff_msmpeg4_decode_init,
950 .close = ff_h263_decode_end,
951 .decode = ff_h263_decode_frame,
952 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
954 .pix_fmts = ff_pixfmt_list_420,
957 AVCodec ff_wmv1_decoder = {
959 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
960 .type = AVMEDIA_TYPE_VIDEO,
961 .id = AV_CODEC_ID_WMV1,
962 .priv_data_size = sizeof(MpegEncContext),
963 .init = ff_msmpeg4_decode_init,
964 .close = ff_h263_decode_end,
965 .decode = ff_h263_decode_frame,
966 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
968 .pix_fmts = ff_pixfmt_list_420,