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);
233 //s->mb_intra = (code & 0x40) ? 0 : 1;
234 s->mb_intra = (~code & 0x40) >> 6;
239 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
242 /* predict coded block pattern */
245 int val = ((code >> (5 - i)) & 1);
247 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
251 cbp |= val << (5 - i);
257 if(s->per_mb_rl_table && cbp){
258 s->rl_table_index = decode012(&s->gb);
259 s->rl_chroma_table_index = s->rl_table_index;
261 ff_h263_pred_motion(s, 0, 0, &mx, &my);
262 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
264 s->mv_dir = MV_DIR_FORWARD;
265 s->mv_type = MV_TYPE_16X16;
268 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
270 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
271 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
272 show_bits(&s->gb, 24));
273 s->ac_pred = get_bits1(&s->gb);
274 *mb_type_ptr = MB_TYPE_INTRA;
275 if(s->inter_intra_pred){
276 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
277 ff_dlog(s, "%d%d %d %d/",
278 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
280 if(s->per_mb_rl_table && cbp){
281 s->rl_table_index = decode012(&s->gb);
282 s->rl_chroma_table_index = s->rl_table_index;
286 s->bdsp.clear_blocks(s->block[0]);
287 for (i = 0; i < 6; i++) {
288 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
290 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
298 /* init all vlc decoding tables */
299 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
301 MpegEncContext *s = avctx->priv_data;
302 static volatile int done = 0;
306 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
309 if (ff_h263_decode_init(avctx) < 0)
312 ff_msmpeg4_common_init(s);
315 for(i=0;i<NB_RL_TABLES;i++) {
316 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
318 INIT_FIRST_VLC_RL(ff_rl_table[0], 642);
319 INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
320 INIT_FIRST_VLC_RL(ff_rl_table[2], 554);
321 INIT_VLC_RL(ff_rl_table[3], 940);
322 INIT_VLC_RL(ff_rl_table[4], 962);
323 /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been
324 * initialized in ff_h263_decode_init() above. So just copy the VLCs. */
325 av_assert1(ff_h263_rl_inter.rl_vlc[0]);
326 memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc));
328 mv = &ff_mv_tables[0];
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, 3714);
332 mv = &ff_mv_tables[1];
333 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
334 mv->table_mv_bits, 1, 1,
335 mv->table_mv_code, 2, 2, 2694);
337 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
338 &ff_table0_dc_lum[0][1], 8, 4,
339 &ff_table0_dc_lum[0][0], 8, 4, 1158);
340 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
341 &ff_table0_dc_chroma[0][1], 8, 4,
342 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
343 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
344 &ff_table1_dc_lum[0][1], 8, 4,
345 &ff_table1_dc_lum[0][0], 8, 4, 1476);
346 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
347 &ff_table1_dc_chroma[0][1], 8, 4,
348 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
350 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
351 &ff_v2_dc_lum_table[0][1], 8, 4,
352 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
353 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
354 &ff_v2_dc_chroma_table[0][1], 8, 4,
355 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
357 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
358 &ff_v2_intra_cbpc[0][1], 2, 1,
359 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
360 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
361 &ff_v2_mb_type[0][1], 2, 1,
362 &ff_v2_mb_type[0][0], 2, 1, 128);
364 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
365 &ff_wmv2_inter_table[0][0][1], 8, 4,
366 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
367 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
368 &ff_wmv2_inter_table[1][0][1], 8, 4,
369 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
370 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
371 &ff_wmv2_inter_table[2][0][1], 8, 4,
372 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
373 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
374 &ff_wmv2_inter_table[3][0][1], 8, 4,
375 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
377 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
378 &ff_msmp4_mb_i_table[0][1], 4, 2,
379 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
381 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
382 &ff_table_inter_intra[0][1], 2, 1,
383 &ff_table_inter_intra[0][0], 2, 1, 8);
387 switch(s->msmpeg4_version){
390 s->decode_mb= msmpeg4v12_decode_mb;
394 s->decode_mb= msmpeg4v34_decode_mb;
397 if (CONFIG_WMV2_DECODER)
398 s->decode_mb= ff_wmv2_decode_mb;
400 //FIXME + TODO VC1 decode mb
404 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
409 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
413 // at minimum one bit per macroblock is required at least in a valid frame,
414 // we discard frames much smaller than this. Frames smaller than 1/8 of the
415 // smallest "black/skip" frame generally contain not much recoverable content
416 // while at the same time they have the highest computational requirements
418 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
419 return AVERROR_INVALIDDATA;
421 if(s->msmpeg4_version==1){
422 int start_code = get_bits_long(&s->gb, 32);
423 if(start_code!=0x00000100){
424 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
428 skip_bits(&s->gb, 5); // frame number */
431 s->pict_type = get_bits(&s->gb, 2) + 1;
432 if (s->pict_type != AV_PICTURE_TYPE_I &&
433 s->pict_type != AV_PICTURE_TYPE_P){
434 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
437 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
439 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
443 if (s->pict_type == AV_PICTURE_TYPE_I) {
444 code = get_bits(&s->gb, 5);
445 if(s->msmpeg4_version==1){
446 if(code==0 || code>s->mb_height){
447 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
451 s->slice_height = code;
453 /* 0x17: one slice, 0x18: two slices, ... */
455 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
459 s->slice_height = s->mb_height / (code - 0x16);
462 switch(s->msmpeg4_version){
465 s->rl_chroma_table_index = 2;
466 s->rl_table_index = 2;
468 s->dc_table_index = 0; //not used
471 s->rl_chroma_table_index = decode012(&s->gb);
472 s->rl_table_index = decode012(&s->gb);
474 s->dc_table_index = get_bits1(&s->gb);
477 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
479 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
480 else s->per_mb_rl_table= 0;
482 if(!s->per_mb_rl_table){
483 s->rl_chroma_table_index = decode012(&s->gb);
484 s->rl_table_index = decode012(&s->gb);
487 s->dc_table_index = get_bits1(&s->gb);
488 s->inter_intra_pred= 0;
492 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
493 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
495 s->rl_chroma_table_index,
501 switch(s->msmpeg4_version){
504 if(s->msmpeg4_version==1)
505 s->use_skip_mb_code = 1;
507 s->use_skip_mb_code = get_bits1(&s->gb);
508 s->rl_table_index = 2;
509 s->rl_chroma_table_index = s->rl_table_index;
510 s->dc_table_index = 0; //not used
511 s->mv_table_index = 0;
514 s->use_skip_mb_code = get_bits1(&s->gb);
515 s->rl_table_index = decode012(&s->gb);
516 s->rl_chroma_table_index = s->rl_table_index;
518 s->dc_table_index = get_bits1(&s->gb);
520 s->mv_table_index = get_bits1(&s->gb);
523 s->use_skip_mb_code = get_bits1(&s->gb);
525 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
526 else s->per_mb_rl_table= 0;
528 if(!s->per_mb_rl_table){
529 s->rl_table_index = decode012(&s->gb);
530 s->rl_chroma_table_index = s->rl_table_index;
533 s->dc_table_index = get_bits1(&s->gb);
535 s->mv_table_index = get_bits1(&s->gb);
536 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
540 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
541 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
544 s->rl_chroma_table_index,
550 if(s->flipflop_rounding){
556 ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
557 s->inter_intra_pred, s->width, s->height);
559 s->esc3_level_length= 0;
560 s->esc3_run_length= 0;
565 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
567 int left= buf_size*8 - get_bits_count(&s->gb);
568 int length= s->msmpeg4_version>=3 ? 17 : 16;
569 /* the alt_bitstream reader could read over the end so we need to check it */
570 if(left>=length && left<length+8)
572 skip_bits(&s->gb, 5); /* fps */
573 s->bit_rate= get_bits(&s->gb, 11)*1024;
574 if(s->msmpeg4_version>=3)
575 s->flipflop_rounding= get_bits1(&s->gb);
577 s->flipflop_rounding= 0;
579 else if(left<length+8)
581 s->flipflop_rounding= 0;
582 if(s->msmpeg4_version != 2)
583 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
587 av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
593 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
597 if(s->msmpeg4_version<=2){
599 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
601 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
604 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
609 }else{ //FIXME optimize use unified tables & index
611 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
613 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
616 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
621 if (level == DC_MAX) {
622 level = get_bits(&s->gb, 8);
623 if (get_bits1(&s->gb))
625 } else if (level != 0) {
626 if (get_bits1(&s->gb))
631 if(s->msmpeg4_version==1){
633 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
636 /* update predictor */
640 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
643 /* update predictor */
645 *dc_val = level * s->y_dc_scale;
647 *dc_val = level * s->c_dc_scale;
654 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
655 int n, int coded, const uint8_t *scan_table)
657 int level, i, last, run, run_diff;
658 int av_uninit(dc_pred_dir);
668 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
671 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
672 if(s->inter_intra_pred) level=0;
675 rl = &ff_rl_table[s->rl_table_index];
676 if(level > 256*s->y_dc_scale){
677 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
678 if(!s->inter_intra_pred) return -1;
681 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
682 if(level > 256*s->c_dc_scale){
683 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
684 if(!s->inter_intra_pred) return -1;
689 run_diff = s->msmpeg4_version >= 4;
695 if (dc_pred_dir == 0)
696 scan_table = s->intra_v_scantable.permutated; /* left */
698 scan_table = s->intra_h_scantable.permutated; /* top */
700 scan_table = s->intra_scantable.permutated;
702 rl_vlc= rl->rl_vlc[0];
704 qmul = s->qscale << 1;
705 qadd = (s->qscale - 1) | 1;
707 rl = &ff_rl_table[3 + s->rl_table_index];
709 if(s->msmpeg4_version==2)
715 s->block_last_index[n] = i;
719 scan_table = s->inter_scantable.permutated;
720 rl_vlc= rl->rl_vlc[s->qscale];
723 OPEN_READER(re, &s->gb);
725 UPDATE_CACHE(re, &s->gb);
726 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
729 cache= GET_CACHE(re, &s->gb);
731 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
732 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
734 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
735 UPDATE_CACHE(re, &s->gb);
736 if(s->msmpeg4_version<=3){
737 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
738 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
739 level= SHOW_SBITS(re, &s->gb, 8);
740 SKIP_COUNTER(re, &s->gb, 1+6+8);
743 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
744 if(!s->esc3_level_length){
746 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
747 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
749 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
751 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
755 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
757 SKIP_BITS(re, &s->gb, 1);
759 if(ll<8) SKIP_BITS(re, &s->gb, 1);
762 s->esc3_level_length= ll;
763 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
764 UPDATE_CACHE(re, &s->gb);
766 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
767 SKIP_BITS(re, &s->gb, s->esc3_run_length);
769 sign= SHOW_UBITS(re, &s->gb, 1);
770 SKIP_BITS(re, &s->gb, 1);
772 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
773 SKIP_BITS(re, &s->gb, s->esc3_level_length);
774 if(sign) level= -level;
777 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
778 if (level>0) level= level * qmul + qadd;
779 else level= level * qmul - qadd;
784 SKIP_BITS(re, &s->gb, 2);
785 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
786 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //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 SKIP_BITS(re, &s->gb, 1);
793 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
795 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
796 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
797 LAST_SKIP_BITS(re, &s->gb, 1);
801 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
802 LAST_SKIP_BITS(re, &s->gb, 1);
807 const int left= get_bits_left(&s->gb);
808 if (((i + 192 == 64 && level / qmul == -1) ||
809 !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
811 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
815 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
820 block[scan_table[i]] = level;
824 block[scan_table[i]] = level;
826 CLOSE_READER(re, &s->gb);
830 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
832 i = 63; /* XXX: not optimal */
835 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
836 s->block_last_index[n] = i;
841 int ff_msmpeg4_decode_motion(MpegEncContext * s,
842 int *mx_ptr, int *my_ptr)
847 mv = &ff_mv_tables[s->mv_table_index];
849 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
851 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
855 mx = get_bits(&s->gb, 6);
856 my = get_bits(&s->gb, 6);
858 mx = mv->table_mvx[code];
859 my = mv->table_mvy[code];
864 /* WARNING : they do not do exactly modulo encoding */
879 AVCodec ff_msmpeg4v1_decoder = {
881 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
882 .type = AVMEDIA_TYPE_VIDEO,
883 .id = AV_CODEC_ID_MSMPEG4V1,
884 .priv_data_size = sizeof(MpegEncContext),
885 .init = ff_msmpeg4_decode_init,
886 .close = ff_h263_decode_end,
887 .decode = ff_h263_decode_frame,
888 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
889 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
891 .pix_fmts = (const enum AVPixelFormat[]) {
897 AVCodec ff_msmpeg4v2_decoder = {
899 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
900 .type = AVMEDIA_TYPE_VIDEO,
901 .id = AV_CODEC_ID_MSMPEG4V2,
902 .priv_data_size = sizeof(MpegEncContext),
903 .init = ff_msmpeg4_decode_init,
904 .close = ff_h263_decode_end,
905 .decode = ff_h263_decode_frame,
906 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
907 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
909 .pix_fmts = (const enum AVPixelFormat[]) {
915 AVCodec ff_msmpeg4v3_decoder = {
917 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
918 .type = AVMEDIA_TYPE_VIDEO,
919 .id = AV_CODEC_ID_MSMPEG4V3,
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 = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
925 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
927 .pix_fmts = (const enum AVPixelFormat[]) {
933 AVCodec ff_wmv1_decoder = {
935 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
936 .type = AVMEDIA_TYPE_VIDEO,
937 .id = AV_CODEC_ID_WMV1,
938 .priv_data_size = sizeof(MpegEncContext),
939 .init = ff_msmpeg4_decode_init,
940 .close = ff_h263_decode_end,
941 .decode = ff_h263_decode_frame,
942 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
943 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
945 .pix_fmts = (const enum AVPixelFormat[]) {