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"
39 #define V2_INTRA_CBPC_VLC_BITS 3
40 #define V2_MB_TYPE_VLC_BITS 7
42 #define V2_MV_VLC_BITS 9
43 #define TEX_VLC_BITS 9
45 #define DEFAULT_INTER_INDEX 3
47 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
58 *dc_val_ptr= &s->last_dc[i];
62 /****************************************/
65 VLC ff_mb_non_intra_vlc[4];
66 static VLC v2_dc_lum_vlc;
67 static VLC v2_dc_chroma_vlc;
68 static VLC v2_intra_cbpc_vlc;
69 static VLC v2_mb_type_vlc;
71 VLC ff_inter_intra_vlc;
73 /* This is identical to h263 except that its range is multiplied by 2. */
74 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
76 int code, val, sign, shift;
78 code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
79 ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
85 sign = get_bits1(&s->gb);
89 val = (val - 1) << shift;
90 val |= get_bits(&s->gb, shift);
105 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
108 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
110 if (s->pict_type == AV_PICTURE_TYPE_P) {
111 if (s->use_skip_mb_code) {
112 if (get_bits1(&s->gb)) {
116 s->block_last_index[i] = -1;
117 s->mv_dir = MV_DIR_FORWARD;
118 s->mv_type = MV_TYPE_16X16;
122 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
127 if(s->msmpeg4_version==2)
128 code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
130 code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
131 if(code<0 || code>7){
132 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
136 s->mb_intra = code >>2;
141 if(s->msmpeg4_version==2)
142 cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
144 cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
146 av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
154 cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
156 av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
161 if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
163 ff_h263_pred_motion(s, 0, 0, &mx, &my);
164 mx= msmpeg4v2_decode_motion(s, mx, 1);
165 my= msmpeg4v2_decode_motion(s, my, 1);
167 s->mv_dir = MV_DIR_FORWARD;
168 s->mv_type = MV_TYPE_16X16;
171 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
173 if(s->msmpeg4_version==2){
174 s->ac_pred = get_bits1(&s->gb);
175 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
178 cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
179 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
181 *mb_type_ptr = MB_TYPE_INTRA;
184 s->bdsp.clear_blocks(s->block[0]);
185 for (i = 0; i < 6; i++) {
186 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
188 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
195 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
199 uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
201 if (s->pict_type == AV_PICTURE_TYPE_P) {
202 if (s->use_skip_mb_code) {
203 if (get_bits1(&s->gb)) {
207 s->block_last_index[i] = -1;
208 s->mv_dir = MV_DIR_FORWARD;
209 s->mv_type = MV_TYPE_16X16;
213 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
219 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
222 //s->mb_intra = (code & 0x40) ? 0 : 1;
223 s->mb_intra = (~code & 0x40) >> 6;
228 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
231 /* predict coded block pattern */
234 int val = ((code >> (5 - i)) & 1);
236 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
240 cbp |= val << (5 - i);
246 if(s->per_mb_rl_table && cbp){
247 s->rl_table_index = decode012(&s->gb);
248 s->rl_chroma_table_index = s->rl_table_index;
250 ff_h263_pred_motion(s, 0, 0, &mx, &my);
251 if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
253 s->mv_dir = MV_DIR_FORWARD;
254 s->mv_type = MV_TYPE_16X16;
257 *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
259 ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
260 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
261 show_bits(&s->gb, 24));
262 s->ac_pred = get_bits1(&s->gb);
263 *mb_type_ptr = MB_TYPE_INTRA;
264 if(s->inter_intra_pred){
265 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
266 ff_dlog(s, "%d%d %d %d/",
267 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
269 if(s->per_mb_rl_table && cbp){
270 s->rl_table_index = decode012(&s->gb);
271 s->rl_chroma_table_index = s->rl_table_index;
275 s->bdsp.clear_blocks(s->block[0]);
276 for (i = 0; i < 6; i++) {
277 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
279 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
287 /* init all vlc decoding tables */
288 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
290 MpegEncContext *s = avctx->priv_data;
291 static volatile int done = 0;
295 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
298 if (ff_h263_decode_init(avctx) < 0)
301 ff_msmpeg4_common_init(s);
304 for(i=0;i<NB_RL_TABLES;i++) {
305 ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
307 INIT_VLC_RL(ff_rl_table[0], 642);
308 INIT_VLC_RL(ff_rl_table[1], 1104);
309 INIT_VLC_RL(ff_rl_table[2], 554);
310 INIT_VLC_RL(ff_rl_table[3], 940);
311 INIT_VLC_RL(ff_rl_table[4], 962);
312 INIT_VLC_RL(ff_rl_table[5], 554);
314 mv = &ff_mv_tables[0];
315 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
316 mv->table_mv_bits, 1, 1,
317 mv->table_mv_code, 2, 2, 3714);
318 mv = &ff_mv_tables[1];
319 INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
320 mv->table_mv_bits, 1, 1,
321 mv->table_mv_code, 2, 2, 2694);
323 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
324 &ff_table0_dc_lum[0][1], 8, 4,
325 &ff_table0_dc_lum[0][0], 8, 4, 1158);
326 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
327 &ff_table0_dc_chroma[0][1], 8, 4,
328 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
329 INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
330 &ff_table1_dc_lum[0][1], 8, 4,
331 &ff_table1_dc_lum[0][0], 8, 4, 1476);
332 INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
333 &ff_table1_dc_chroma[0][1], 8, 4,
334 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
336 INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
337 &ff_v2_dc_lum_table[0][1], 8, 4,
338 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
339 INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
340 &ff_v2_dc_chroma_table[0][1], 8, 4,
341 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
343 INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
344 &ff_v2_intra_cbpc[0][1], 2, 1,
345 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
346 INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
347 &ff_v2_mb_type[0][1], 2, 1,
348 &ff_v2_mb_type[0][0], 2, 1, 128);
349 INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
350 &ff_mvtab[0][1], 2, 1,
351 &ff_mvtab[0][0], 2, 1, 538);
353 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
354 &ff_wmv2_inter_table[0][0][1], 8, 4,
355 &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
356 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
357 &ff_wmv2_inter_table[1][0][1], 8, 4,
358 &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
359 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
360 &ff_wmv2_inter_table[2][0][1], 8, 4,
361 &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
362 INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
363 &ff_wmv2_inter_table[3][0][1], 8, 4,
364 &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
366 INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
367 &ff_msmp4_mb_i_table[0][1], 4, 2,
368 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
370 INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
371 &ff_table_inter_intra[0][1], 2, 1,
372 &ff_table_inter_intra[0][0], 2, 1, 8);
376 switch(s->msmpeg4_version){
379 s->decode_mb= msmpeg4v12_decode_mb;
383 s->decode_mb= msmpeg4v34_decode_mb;
386 if (CONFIG_WMV2_DECODER)
387 s->decode_mb= ff_wmv2_decode_mb;
389 //FIXME + TODO VC1 decode mb
393 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
398 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
402 if(s->msmpeg4_version==1){
403 int start_code = get_bits_long(&s->gb, 32);
404 if(start_code!=0x00000100){
405 av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
409 skip_bits(&s->gb, 5); // frame number */
412 s->pict_type = get_bits(&s->gb, 2) + 1;
413 if (s->pict_type != AV_PICTURE_TYPE_I &&
414 s->pict_type != AV_PICTURE_TYPE_P){
415 av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
421 if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1;
422 if(!had_i) return -1;
425 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
427 av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
431 if (s->pict_type == AV_PICTURE_TYPE_I) {
432 code = get_bits(&s->gb, 5);
433 if(s->msmpeg4_version==1){
434 if(code==0 || code>s->mb_height){
435 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
439 s->slice_height = code;
441 /* 0x17: one slice, 0x18: two slices, ... */
443 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
447 s->slice_height = s->mb_height / (code - 0x16);
450 switch(s->msmpeg4_version){
453 s->rl_chroma_table_index = 2;
454 s->rl_table_index = 2;
456 s->dc_table_index = 0; //not used
459 s->rl_chroma_table_index = decode012(&s->gb);
460 s->rl_table_index = decode012(&s->gb);
462 s->dc_table_index = get_bits1(&s->gb);
465 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
467 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
468 else s->per_mb_rl_table= 0;
470 if(!s->per_mb_rl_table){
471 s->rl_chroma_table_index = decode012(&s->gb);
472 s->rl_table_index = decode012(&s->gb);
475 s->dc_table_index = get_bits1(&s->gb);
476 s->inter_intra_pred= 0;
480 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
481 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
483 s->rl_chroma_table_index,
489 switch(s->msmpeg4_version){
492 if(s->msmpeg4_version==1)
493 s->use_skip_mb_code = 1;
495 s->use_skip_mb_code = get_bits1(&s->gb);
496 s->rl_table_index = 2;
497 s->rl_chroma_table_index = s->rl_table_index;
498 s->dc_table_index = 0; //not used
499 s->mv_table_index = 0;
502 s->use_skip_mb_code = get_bits1(&s->gb);
503 s->rl_table_index = decode012(&s->gb);
504 s->rl_chroma_table_index = s->rl_table_index;
506 s->dc_table_index = get_bits1(&s->gb);
508 s->mv_table_index = get_bits1(&s->gb);
511 s->use_skip_mb_code = get_bits1(&s->gb);
513 if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
514 else s->per_mb_rl_table= 0;
516 if(!s->per_mb_rl_table){
517 s->rl_table_index = decode012(&s->gb);
518 s->rl_chroma_table_index = s->rl_table_index;
521 s->dc_table_index = get_bits1(&s->gb);
523 s->mv_table_index = get_bits1(&s->gb);
524 s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
528 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
529 av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
532 s->rl_chroma_table_index,
538 if(s->flipflop_rounding){
544 ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,
545 s->inter_intra_pred, s->width, s->height);
547 s->esc3_level_length= 0;
548 s->esc3_run_length= 0;
553 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
555 int left= buf_size*8 - get_bits_count(&s->gb);
556 int length= s->msmpeg4_version>=3 ? 17 : 16;
557 /* the alt_bitstream reader could read over the end so we need to check it */
558 if(left>=length && left<length+8)
560 skip_bits(&s->gb, 5); /* fps */
561 s->bit_rate= get_bits(&s->gb, 11)*1024;
562 if(s->msmpeg4_version>=3)
563 s->flipflop_rounding= get_bits1(&s->gb);
565 s->flipflop_rounding= 0;
567 else if(left<length+8)
569 s->flipflop_rounding= 0;
570 if(s->msmpeg4_version != 2)
571 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
575 av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
581 static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
585 if(s->msmpeg4_version<=2){
587 level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
589 level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
592 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
597 }else{ //FIXME optimize use unified tables & index
599 level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
601 level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
604 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
609 if (level == DC_MAX) {
610 level = get_bits(&s->gb, 8);
611 if (get_bits1(&s->gb))
613 } else if (level != 0) {
614 if (get_bits1(&s->gb))
619 if(s->msmpeg4_version==1){
621 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
624 /* update predictor */
628 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
631 /* update predictor */
633 *dc_val = level * s->y_dc_scale;
635 *dc_val = level * s->c_dc_scale;
642 //#define ERROR_DETAILS
643 int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
644 int n, int coded, const uint8_t *scan_table)
646 int level, i, last, run, run_diff;
647 int av_uninit(dc_pred_dir);
657 level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
660 av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
661 if(s->inter_intra_pred) level=0;
664 rl = &ff_rl_table[s->rl_table_index];
665 if(level > 256*s->y_dc_scale){
666 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
667 if(!s->inter_intra_pred) return -1;
670 rl = &ff_rl_table[3 + s->rl_chroma_table_index];
671 if(level > 256*s->c_dc_scale){
672 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
673 if(!s->inter_intra_pred) return -1;
678 run_diff = s->msmpeg4_version >= 4;
684 if (dc_pred_dir == 0)
685 scan_table = s->intra_v_scantable.permutated; /* left */
687 scan_table = s->intra_h_scantable.permutated; /* top */
689 scan_table = s->intra_scantable.permutated;
691 rl_vlc= rl->rl_vlc[0];
693 qmul = s->qscale << 1;
694 qadd = (s->qscale - 1) | 1;
696 rl = &ff_rl_table[3 + s->rl_table_index];
698 if(s->msmpeg4_version==2)
704 s->block_last_index[n] = i;
708 scan_table = s->inter_scantable.permutated;
709 rl_vlc= rl->rl_vlc[s->qscale];
712 OPEN_READER(re, &s->gb);
714 UPDATE_CACHE(re, &s->gb);
715 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
718 cache= GET_CACHE(re, &s->gb);
720 if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
721 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
723 if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
724 UPDATE_CACHE(re, &s->gb);
725 if(s->msmpeg4_version<=3){
726 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
727 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
728 level= SHOW_SBITS(re, &s->gb, 8);
729 SKIP_COUNTER(re, &s->gb, 1+6+8);
732 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
733 if(!s->esc3_level_length){
735 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
736 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
738 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
740 ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
744 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
746 SKIP_BITS(re, &s->gb, 1);
748 if(ll<8) SKIP_BITS(re, &s->gb, 1);
751 s->esc3_level_length= ll;
752 s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
753 UPDATE_CACHE(re, &s->gb);
755 run= SHOW_UBITS(re, &s->gb, s->esc3_run_length);
756 SKIP_BITS(re, &s->gb, s->esc3_run_length);
758 sign= SHOW_UBITS(re, &s->gb, 1);
759 SKIP_BITS(re, &s->gb, 1);
761 level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
762 SKIP_BITS(re, &s->gb, s->esc3_level_length);
763 if(sign) level= -level;
766 #if 0 // waste of time / this will detect very few errors
768 const int abs_level= FFABS(level);
769 const int run1= run - rl->max_run[last][abs_level] - run_diff;
770 if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
771 if(abs_level <= rl->max_level[last][run]){
772 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
773 return DECODING_AC_LOST;
775 if(abs_level <= rl->max_level[last][run]*2){
776 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
777 return DECODING_AC_LOST;
779 if(run1>=0 && abs_level <= rl->max_level[last][run1]){
780 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
781 return DECODING_AC_LOST;
786 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
787 if (level>0) level= level * qmul + qadd;
788 else level= level * qmul - qadd;
789 #if 0 // waste of time too :(
790 if(level>2048 || level<-2048){
791 av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n");
792 return DECODING_AC_LOST;
799 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level);
800 else if((i>62 && i<192) || i>192+63)
801 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
805 SKIP_BITS(re, &s->gb, 2);
806 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
807 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
808 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
809 LAST_SKIP_BITS(re, &s->gb, 1);
812 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level);
813 else if((i>62 && i<192) || i>192+63)
814 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
819 SKIP_BITS(re, &s->gb, 1);
820 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
822 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
823 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
824 LAST_SKIP_BITS(re, &s->gb, 1);
827 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level);
828 else if((i>62 && i<192) || i>192+63)
829 av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
834 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
835 LAST_SKIP_BITS(re, &s->gb, 1);
838 av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level);
839 else if((i>62 && i<192) || i>192+63)
840 av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level);
846 const int left= get_bits_left(&s->gb);
847 if (((i + 192 == 64 && level / qmul == -1) ||
848 !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
850 av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
854 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
859 block[scan_table[i]] = level;
863 block[scan_table[i]] = level;
865 CLOSE_READER(re, &s->gb);
869 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
871 i = 63; /* XXX: not optimal */
874 if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
875 s->block_last_index[n] = i;
880 int ff_msmpeg4_decode_motion(MpegEncContext * s,
881 int *mx_ptr, int *my_ptr)
886 mv = &ff_mv_tables[s->mv_table_index];
888 code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
890 av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
894 mx = get_bits(&s->gb, 6);
895 my = get_bits(&s->gb, 6);
897 mx = mv->table_mvx[code];
898 my = mv->table_mvy[code];
903 /* WARNING : they do not do exactly modulo encoding */
918 AVCodec ff_msmpeg4v1_decoder = {
920 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
921 .type = AVMEDIA_TYPE_VIDEO,
922 .id = AV_CODEC_ID_MSMPEG4V1,
923 .priv_data_size = sizeof(MpegEncContext),
924 .init = ff_msmpeg4_decode_init,
925 .close = ff_h263_decode_end,
926 .decode = ff_h263_decode_frame,
927 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
929 .pix_fmts = (const enum AVPixelFormat[]) {
935 AVCodec ff_msmpeg4v2_decoder = {
937 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
938 .type = AVMEDIA_TYPE_VIDEO,
939 .id = AV_CODEC_ID_MSMPEG4V2,
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,
946 .pix_fmts = (const enum AVPixelFormat[]) {
952 AVCodec ff_msmpeg4v3_decoder = {
954 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
955 .type = AVMEDIA_TYPE_VIDEO,
956 .id = AV_CODEC_ID_MSMPEG4V3,
957 .priv_data_size = sizeof(MpegEncContext),
958 .init = ff_msmpeg4_decode_init,
959 .close = ff_h263_decode_end,
960 .decode = ff_h263_decode_frame,
961 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
963 .pix_fmts = (const enum AVPixelFormat[]) {
969 AVCodec ff_wmv1_decoder = {
971 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
972 .type = AVMEDIA_TYPE_VIDEO,
973 .id = AV_CODEC_ID_WMV1,
974 .priv_data_size = sizeof(MpegEncContext),
975 .init = ff_msmpeg4_decode_init,
976 .close = ff_h263_decode_end,
977 .decode = ff_h263_decode_frame,
978 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
980 .pix_fmts = (const enum AVPixelFormat[]) {