LCOV - code coverage report
Current view: top level - libavcodec - ituh263dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 511 756 67.6 %
Date: 2018-05-20 11:54:08 Functions: 13 16 81.2 %

          Line data    Source code
       1             : /*
       2             :  * ITU H.263 bitstream decoder
       3             :  * Copyright (c) 2000,2001 Fabrice Bellard
       4             :  * H.263+ support.
       5             :  * Copyright (c) 2001 Juan J. Sierralta P
       6             :  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
       7             :  *
       8             :  * This file is part of FFmpeg.
       9             :  *
      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.
      14             :  *
      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.
      19             :  *
      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
      23             :  */
      24             : 
      25             : /**
      26             :  * @file
      27             :  * H.263 decoder.
      28             :  */
      29             : 
      30             : #define UNCHECKED_BITSTREAM_READER 1
      31             : #include <limits.h>
      32             : 
      33             : #include "libavutil/attributes.h"
      34             : #include "libavutil/imgutils.h"
      35             : #include "libavutil/internal.h"
      36             : #include "libavutil/mathematics.h"
      37             : #include "avcodec.h"
      38             : #include "mpegvideo.h"
      39             : #include "h263.h"
      40             : #include "h263data.h"
      41             : #include "internal.h"
      42             : #include "mathops.h"
      43             : #include "mpegutils.h"
      44             : #include "unary.h"
      45             : #include "flv.h"
      46             : #include "rv10.h"
      47             : #include "mpeg4video.h"
      48             : #include "mpegvideodata.h"
      49             : 
      50             : // The defines below define the number of bits that are read at once for
      51             : // reading vlc values. Changing these may improve speed and data cache needs
      52             : // be aware though that decreasing them may need the number of stages that is
      53             : // passed to get_vlc* to be increased.
      54             : #define MV_VLC_BITS 9
      55             : #define H263_MBTYPE_B_VLC_BITS 6
      56             : #define CBPC_B_VLC_BITS 3
      57             : 
      58             : static const int h263_mb_type_b_map[15]= {
      59             :     MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
      60             :     MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
      61             :     MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
      62             :                       MB_TYPE_L0                                 | MB_TYPE_16x16,
      63             :                       MB_TYPE_L0   | MB_TYPE_CBP                 | MB_TYPE_16x16,
      64             :                       MB_TYPE_L0   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
      65             :                       MB_TYPE_L1                                 | MB_TYPE_16x16,
      66             :                       MB_TYPE_L1   | MB_TYPE_CBP                 | MB_TYPE_16x16,
      67             :                       MB_TYPE_L1   | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
      68             :                       MB_TYPE_L0L1                               | MB_TYPE_16x16,
      69             :                       MB_TYPE_L0L1 | MB_TYPE_CBP                 | MB_TYPE_16x16,
      70             :                       MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
      71             :     0, //stuffing
      72             :     MB_TYPE_INTRA4x4                | MB_TYPE_CBP,
      73             :     MB_TYPE_INTRA4x4                | MB_TYPE_CBP | MB_TYPE_QUANT,
      74             : };
      75             : 
      76         461 : void ff_h263_show_pict_info(MpegEncContext *s){
      77         461 :     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
      78           0 :     av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
      79           0 :          s->qscale, av_get_picture_type_char(s->pict_type),
      80           0 :          s->gb.size_in_bits, 1-s->no_rounding,
      81           0 :          s->obmc ? " AP" : "",
      82           0 :          s->umvplus ? " UMV" : "",
      83           0 :          s->h263_long_vectors ? " LONG" : "",
      84           0 :          s->h263_plus ? " +" : "",
      85           0 :          s->h263_aic ? " AIC" : "",
      86           0 :          s->alt_inter_vlc ? " AIV" : "",
      87           0 :          s->modified_quant ? " MQ" : "",
      88           0 :          s->loop_filter ? " LOOP" : "",
      89           0 :          s->h263_slice_structured ? " SS" : "",
      90           0 :          s->avctx->framerate.num, s->avctx->framerate.den
      91             :     );
      92             :     }
      93         461 : }
      94             : 
      95             : /***********************************************/
      96             : /* decoding */
      97             : 
      98             : VLC ff_h263_intra_MCBPC_vlc;
      99             : VLC ff_h263_inter_MCBPC_vlc;
     100             : VLC ff_h263_cbpy_vlc;
     101             : static VLC mv_vlc;
     102             : static VLC h263_mbtype_b_vlc;
     103             : static VLC cbpc_b_vlc;
     104             : 
     105             : /* init vlcs */
     106             : 
     107             : /* XXX: find a better solution to handle static init */
     108         296 : av_cold void ff_h263_decode_init_vlc(void)
     109             : {
     110             :     static volatile int done = 0;
     111             : 
     112         296 :     if (!done) {
     113         166 :         INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
     114             :                  ff_h263_intra_MCBPC_bits, 1, 1,
     115             :                  ff_h263_intra_MCBPC_code, 1, 1, 72);
     116         166 :         INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
     117             :                  ff_h263_inter_MCBPC_bits, 1, 1,
     118             :                  ff_h263_inter_MCBPC_code, 1, 1, 198);
     119         166 :         INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
     120             :                  &ff_h263_cbpy_tab[0][1], 2, 1,
     121             :                  &ff_h263_cbpy_tab[0][0], 2, 1, 64);
     122         166 :         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
     123             :                  &ff_mvtab[0][1], 2, 1,
     124             :                  &ff_mvtab[0][0], 2, 1, 538);
     125         166 :         ff_rl_init(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);
     126         166 :         ff_rl_init(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);
     127         166 :         INIT_VLC_RL(ff_h263_rl_inter, 554);
     128         166 :         INIT_VLC_RL(ff_rl_intra_aic, 554);
     129         166 :         INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
     130             :                  &ff_h263_mbtype_b_tab[0][1], 2, 1,
     131             :                  &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
     132         166 :         INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
     133             :                  &ff_cbpc_b_tab[0][1], 2, 1,
     134             :                  &ff_cbpc_b_tab[0][0], 2, 1, 8);
     135         166 :         done = 1;
     136             :     }
     137         296 : }
     138             : 
     139         742 : int ff_h263_decode_mba(MpegEncContext *s)
     140             : {
     141             :     int i, mb_pos;
     142             : 
     143        2226 :     for (i = 0; i < 6; i++)
     144        2226 :         if (s->mb_num - 1 <= ff_mba_max[i])
     145         742 :             break;
     146         742 :     mb_pos  = get_bits(&s->gb, ff_mba_length[i]);
     147         742 :     s->mb_x = mb_pos % s->mb_width;
     148         742 :     s->mb_y = mb_pos / s->mb_width;
     149             : 
     150         742 :     return mb_pos;
     151             : }
     152             : 
     153             : /**
     154             :  * Decode the group of blocks header or slice header.
     155             :  * @return <0 if an error occurred
     156             :  */
     157        2544 : static int h263_decode_gob_header(MpegEncContext *s)
     158             : {
     159             :     unsigned int val, gob_number;
     160             :     int left;
     161             : 
     162             :     /* Check for GOB Start Code */
     163        2544 :     val = show_bits(&s->gb, 16);
     164        2544 :     if(val)
     165           0 :         return -1;
     166             : 
     167             :         /* We have a GBSC probably with GSTUFF */
     168        2544 :     skip_bits(&s->gb, 16); /* Drop the zeros */
     169        2544 :     left= get_bits_left(&s->gb);
     170        2544 :     left = FFMIN(left, 32);
     171             :     //MN: we must check the bits left or we might end in an infinite loop (or segfault)
     172       11538 :     for(;left>13; left--){
     173       11538 :         if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
     174             :     }
     175        2544 :     if(left<=13)
     176           0 :         return -1;
     177             : 
     178        2544 :     if(s->h263_slice_structured){
     179           0 :         if(check_marker(s->avctx, &s->gb, "before MBA")==0)
     180           0 :             return -1;
     181             : 
     182           0 :         ff_h263_decode_mba(s);
     183             : 
     184           0 :         if(s->mb_num > 1583)
     185           0 :             if(check_marker(s->avctx, &s->gb, "after MBA")==0)
     186           0 :                 return -1;
     187             : 
     188           0 :         s->qscale = get_bits(&s->gb, 5); /* SQUANT */
     189           0 :         if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
     190           0 :             return -1;
     191           0 :         skip_bits(&s->gb, 2); /* GFID */
     192             :     }else{
     193        2544 :         gob_number = get_bits(&s->gb, 5); /* GN */
     194        2544 :         s->mb_x= 0;
     195        2544 :         s->mb_y= s->gob_index* gob_number;
     196        2544 :         skip_bits(&s->gb, 2); /* GFID */
     197        2544 :         s->qscale = get_bits(&s->gb, 5); /* GQUANT */
     198             :     }
     199             : 
     200        2544 :     if(s->mb_y >= s->mb_height)
     201           0 :         return -1;
     202             : 
     203        2544 :     if(s->qscale==0)
     204           0 :         return -1;
     205             : 
     206        2544 :     return 0;
     207             : }
     208             : 
     209             : /**
     210             :  * Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
     211             :  * @return bit position of the resync_marker, or <0 if none was found
     212             :  */
     213        6411 : int ff_h263_resync(MpegEncContext *s){
     214             :     int left, pos, ret;
     215             : 
     216             :     /* In MPEG-4 studio mode look for a new slice startcode
     217             :      * and decode slice header */
     218        6411 :     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
     219           0 :         align_get_bits(&s->gb);
     220             : 
     221           0 :         while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_START_CODE) {
     222           0 :             get_bits(&s->gb, 8);
     223             :         }
     224             : 
     225           0 :         if (show_bits_long(&s->gb, 32) == SLICE_START_CODE)
     226           0 :             return get_bits_count(&s->gb);
     227             :         else
     228           0 :             return -1;
     229             :     }
     230             : 
     231        6411 :     if(s->codec_id==AV_CODEC_ID_MPEG4){
     232        3867 :         skip_bits1(&s->gb);
     233        3867 :         align_get_bits(&s->gb);
     234             :     }
     235             : 
     236        6411 :     if(show_bits(&s->gb, 16)==0){
     237        6411 :         pos= get_bits_count(&s->gb);
     238        6411 :         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
     239        3867 :             ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
     240             :         else
     241        2544 :             ret= h263_decode_gob_header(s);
     242        6411 :         if(ret>=0)
     243        6411 :             return pos;
     244             :     }
     245             :     //OK, it's not where it is supposed to be ...
     246           0 :     s->gb= s->last_resync_gb;
     247           0 :     align_get_bits(&s->gb);
     248           0 :     left= get_bits_left(&s->gb);
     249             : 
     250           0 :     for(;left>16+1+5+5; left-=8){
     251           0 :         if(show_bits(&s->gb, 16)==0){
     252           0 :             GetBitContext bak= s->gb;
     253             : 
     254           0 :             pos= get_bits_count(&s->gb);
     255           0 :             if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
     256           0 :                 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
     257             :             else
     258           0 :                 ret= h263_decode_gob_header(s);
     259           0 :             if(ret>=0)
     260           0 :                 return pos;
     261             : 
     262           0 :             s->gb= bak;
     263             :         }
     264           0 :         skip_bits(&s->gb, 8);
     265             :     }
     266             : 
     267           0 :     return -1;
     268             : }
     269             : 
     270     3787838 : int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
     271             : {
     272             :     int code, val, sign, shift;
     273     3787838 :     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
     274             : 
     275     3787838 :     if (code == 0)
     276     1862335 :         return pred;
     277     1925503 :     if (code < 0)
     278           0 :         return 0xffff;
     279             : 
     280     1925503 :     sign = get_bits1(&s->gb);
     281     1925503 :     shift = f_code - 1;
     282     1925503 :     val = code;
     283     1925503 :     if (shift) {
     284      222315 :         val = (val - 1) << shift;
     285      222315 :         val |= get_bits(&s->gb, shift);
     286      222315 :         val++;
     287             :     }
     288     1925503 :     if (sign)
     289      807460 :         val = -val;
     290     1925503 :     val += pred;
     291             : 
     292             :     /* modulo decoding */
     293     1925503 :     if (!s->h263_long_vectors) {
     294     1925503 :         val = sign_extend(val, 5 + f_code);
     295             :     } else {
     296             :         /* horrible H.263 long vector mode */
     297           0 :         if (pred < -31 && val < -63)
     298           0 :             val += 64;
     299           0 :         if (pred > 32 && val > 63)
     300           0 :             val -= 64;
     301             : 
     302             :     }
     303     1925503 :     return val;
     304             : }
     305             : 
     306             : 
     307             : /* Decode RVLC of H.263+ UMV */
     308      103298 : static int h263p_decode_umotion(MpegEncContext * s, int pred)
     309             : {
     310      103298 :    int code = 0, sign;
     311             : 
     312      103298 :    if (get_bits1(&s->gb)) /* Motion difference = 0 */
     313       51255 :       return pred;
     314             : 
     315       52043 :    code = 2 + get_bits1(&s->gb);
     316             : 
     317      132845 :    while (get_bits1(&s->gb))
     318             :    {
     319       28759 :       code <<= 1;
     320       28759 :       code += get_bits1(&s->gb);
     321       28759 :       if (code >= 32768) {
     322           0 :           avpriv_request_sample(s->avctx, "Huge DMV");
     323           0 :           return 0xffff;
     324             :       }
     325             :    }
     326       52043 :    sign = code & 1;
     327       52043 :    code >>= 1;
     328             : 
     329       52043 :    code = (sign) ? (pred - code) : (pred + code);
     330             :    ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
     331       52043 :    return code;
     332             : 
     333             : }
     334             : 
     335             : /**
     336             :  * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
     337             :  */
     338       48550 : static void preview_obmc(MpegEncContext *s){
     339       48550 :     GetBitContext gb= s->gb;
     340             : 
     341             :     int cbpc, i, pred_x, pred_y, mx, my;
     342             :     int16_t *mot_val;
     343       48550 :     const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
     344       48550 :     const int stride= s->b8_stride*2;
     345             : 
     346      242750 :     for(i=0; i<4; i++)
     347      194200 :         s->block_index[i]+= 2;
     348      145650 :     for(i=4; i<6; i++)
     349       97100 :         s->block_index[i]+= 1;
     350       48550 :     s->mb_x++;
     351             : 
     352             :     av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
     353             : 
     354             :     do{
     355       48550 :         if (get_bits1(&s->gb)) {
     356             :             /* skip mb */
     357         654 :             mot_val = s->current_picture.motion_val[0][s->block_index[0]];
     358        1308 :             mot_val[0       ]= mot_val[2       ]=
     359        1308 :             mot_val[0+stride]= mot_val[2+stride]= 0;
     360        1308 :             mot_val[1       ]= mot_val[3       ]=
     361        1308 :             mot_val[1+stride]= mot_val[3+stride]= 0;
     362             : 
     363         654 :             s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
     364         654 :             goto end;
     365             :         }
     366       47896 :         cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
     367       47896 :     }while(cbpc == 20);
     368             : 
     369       47896 :     if(cbpc & 4){
     370         957 :         s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
     371             :     }else{
     372       46939 :         get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
     373       46939 :         if (cbpc & 8) {
     374           0 :             if(s->modified_quant){
     375           0 :                 if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
     376           0 :                 else                  skip_bits(&s->gb, 5);
     377             :             }else
     378           0 :                 skip_bits(&s->gb, 2);
     379             :         }
     380             : 
     381       46939 :         if ((cbpc & 16) == 0) {
     382       46939 :                 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
     383             :                 /* 16x16 motion prediction */
     384       46939 :                 mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
     385       46939 :                 if (s->umvplus)
     386           0 :                     mx = h263p_decode_umotion(s, pred_x);
     387             :                 else
     388       46939 :                     mx = ff_h263_decode_motion(s, pred_x, 1);
     389             : 
     390       46939 :                 if (s->umvplus)
     391           0 :                     my = h263p_decode_umotion(s, pred_y);
     392             :                 else
     393       46939 :                     my = ff_h263_decode_motion(s, pred_y, 1);
     394             : 
     395       93878 :                 mot_val[0       ]= mot_val[2       ]=
     396       93878 :                 mot_val[0+stride]= mot_val[2+stride]= mx;
     397       93878 :                 mot_val[1       ]= mot_val[3       ]=
     398       93878 :                 mot_val[1+stride]= mot_val[3+stride]= my;
     399             :         } else {
     400           0 :             s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
     401           0 :             for(i=0;i<4;i++) {
     402           0 :                 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
     403           0 :                 if (s->umvplus)
     404           0 :                     mx = h263p_decode_umotion(s, pred_x);
     405             :                 else
     406           0 :                     mx = ff_h263_decode_motion(s, pred_x, 1);
     407             : 
     408           0 :                 if (s->umvplus)
     409           0 :                     my = h263p_decode_umotion(s, pred_y);
     410             :                 else
     411           0 :                     my = ff_h263_decode_motion(s, pred_y, 1);
     412           0 :                 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
     413           0 :                     skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
     414           0 :                 mot_val[0] = mx;
     415           0 :                 mot_val[1] = my;
     416             :             }
     417             :         }
     418             :     }
     419           0 : end:
     420             : 
     421      242750 :     for(i=0; i<4; i++)
     422      194200 :         s->block_index[i]-= 2;
     423      145650 :     for(i=4; i<6; i++)
     424       97100 :         s->block_index[i]-= 1;
     425       48550 :     s->mb_x--;
     426             : 
     427       48550 :     s->gb= gb;
     428       48550 : }
     429             : 
     430           0 : static void h263_decode_dquant(MpegEncContext *s){
     431             :     static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
     432             : 
     433           0 :     if(s->modified_quant){
     434           0 :         if(get_bits1(&s->gb))
     435           0 :             s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
     436             :         else
     437           0 :             s->qscale= get_bits(&s->gb, 5);
     438             :     }else
     439           0 :         s->qscale += quant_tab[get_bits(&s->gb, 2)];
     440           0 :     ff_set_qscale(s, s->qscale);
     441           0 : }
     442             : 
     443     2828502 : static int h263_decode_block(MpegEncContext * s, int16_t * block,
     444             :                              int n, int coded)
     445             : {
     446             :     int level, i, j, run;
     447     2828502 :     RLTable *rl = &ff_h263_rl_inter;
     448             :     const uint8_t *scan_table;
     449     2828502 :     GetBitContext gb= s->gb;
     450             : 
     451     2828502 :     scan_table = s->intra_scantable.permutated;
     452     2828502 :     if (s->h263_aic && s->mb_intra) {
     453       91098 :         rl = &ff_rl_intra_aic;
     454       91098 :         i = 0;
     455      182196 :         if (s->ac_pred) {
     456        4434 :             if (s->h263_aic_dir)
     457        1596 :                 scan_table = s->intra_v_scantable.permutated; /* left */
     458             :             else
     459        2838 :                 scan_table = s->intra_h_scantable.permutated; /* top */
     460             :         }
     461     2737404 :     } else if (s->mb_intra) {
     462             :         /* DC coef */
     463      327756 :         if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
     464       46710 :           if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
     465             :             int component, diff;
     466           0 :             component = (n <= 3 ? 0 : n - 4 + 1);
     467           0 :             level = s->last_dc[component];
     468           0 :             if (s->rv10_first_dc_coded[component]) {
     469           0 :                 diff = ff_rv_decode_dc(s, n);
     470           0 :                 if (diff == 0xffff)
     471           0 :                     return -1;
     472           0 :                 level += diff;
     473           0 :                 level = level & 0xff; /* handle wrap round */
     474           0 :                 s->last_dc[component] = level;
     475             :             } else {
     476           0 :                 s->rv10_first_dc_coded[component] = 1;
     477             :             }
     478             :           } else {
     479       46710 :                 level = get_bits(&s->gb, 8);
     480       46710 :                 if (level == 255)
     481         542 :                     level = 128;
     482             :           }
     483             :         }else{
     484      281046 :             level = get_bits(&s->gb, 8);
     485      281046 :             if((level&0x7F) == 0){
     486           0 :                 av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
     487           0 :                 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
     488           0 :                     return -1;
     489             :             }
     490      281046 :             if (level == 255)
     491        3309 :                 level = 128;
     492             :         }
     493      327756 :         block[0] = level;
     494      327756 :         i = 1;
     495             :     } else {
     496     2409648 :         i = 0;
     497             :     }
     498     2828502 :     if (!coded) {
     499     1340005 :         if (s->mb_intra && s->h263_aic)
     500        3823 :             goto not_coded;
     501     1336182 :         s->block_last_index[n] = i - 1;
     502     1336182 :         return 0;
     503             :     }
     504     1488497 : retry:
     505             :     {
     506     1554956 :     OPEN_READER(re, &s->gb);
     507     1554956 :     i--; // offset by -1 to allow direct indexing of scan_table
     508             :     for(;;) {
     509    29076944 :         UPDATE_CACHE(re, &s->gb);
     510    15315950 :         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
     511    15315950 :         if (run == 66) {
     512      640501 :             if (level){
     513           0 :                 CLOSE_READER(re, &s->gb);
     514           0 :                 av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
     515           0 :                 return -1;
     516             :             }
     517             :             /* escape */
     518      640501 :             if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
     519      170446 :                 int is11 = SHOW_UBITS(re, &s->gb, 1);
     520      170446 :                 SKIP_CACHE(re, &s->gb, 1);
     521      170446 :                 run = SHOW_UBITS(re, &s->gb, 7) + 1;
     522      170446 :                 if (is11) {
     523           0 :                     SKIP_COUNTER(re, &s->gb, 1 + 7);
     524           0 :                     UPDATE_CACHE(re, &s->gb);
     525           0 :                     level = SHOW_SBITS(re, &s->gb, 11);
     526           0 :                     SKIP_COUNTER(re, &s->gb, 11);
     527             :                 } else {
     528      170446 :                     SKIP_CACHE(re, &s->gb, 7);
     529      170446 :                     level = SHOW_SBITS(re, &s->gb, 7);
     530      170446 :                     SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
     531             :                 }
     532             :             } else {
     533      470055 :                 run = SHOW_UBITS(re, &s->gb, 7) + 1;
     534      470055 :                 SKIP_CACHE(re, &s->gb, 7);
     535      470055 :                 level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
     536      470055 :                 SKIP_COUNTER(re, &s->gb, 7 + 8);
     537      470055 :                 if(level == -128){
     538        3157 :                     UPDATE_CACHE(re, &s->gb);
     539        3157 :                     if (s->codec_id == AV_CODEC_ID_RV10) {
     540             :                         /* XXX: should patch encoder too */
     541           0 :                         level = SHOW_SBITS(re, &s->gb, 12);
     542           0 :                         SKIP_COUNTER(re, &s->gb, 12);
     543             :                     }else{
     544        3157 :                         level = SHOW_UBITS(re, &s->gb, 5);
     545        3157 :                         SKIP_CACHE(re, &s->gb, 5);
     546        3157 :                         level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
     547        3157 :                         SKIP_COUNTER(re, &s->gb, 5 + 6);
     548             :                     }
     549             :                 }
     550             :             }
     551             :         } else {
     552    14675449 :             if (SHOW_UBITS(re, &s->gb, 1))
     553     7316240 :                 level = -level;
     554    14675449 :             SKIP_COUNTER(re, &s->gb, 1);
     555             :         }
     556    15315950 :         i += run;
     557    15315950 :         if (i >= 64){
     558     1554956 :             CLOSE_READER(re, &s->gb);
     559             :             // redo update without last flag, revert -1 offset
     560     1554956 :             i = i - run + ((run-1)&63) + 1;
     561     1554956 :             if (i < 64) {
     562             :                 // only last marker, no overrun
     563     1488497 :                 block[scan_table[i]] = level;
     564     1488497 :                 break;
     565             :             }
     566       66459 :             if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
     567             :                 //Looks like a hack but no, it's the way it is supposed to work ...
     568       66459 :                 rl = &ff_rl_intra_aic;
     569       66459 :                 i = 0;
     570       66459 :                 s->gb= gb;
     571       66459 :                 s->bdsp.clear_block(block);
     572       66459 :                 goto retry;
     573             :             }
     574           0 :             av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
     575           0 :             return -1;
     576             :         }
     577    13760994 :         j = scan_table[i];
     578    13760994 :         block[j] = level;
     579             :     }
     580             :     }
     581     1492320 : not_coded:
     582     1492320 :     if (s->mb_intra && s->h263_aic) {
     583       91098 :         ff_h263_pred_acdc(s, block, n);
     584       91098 :         i = 63;
     585             :     }
     586     1492320 :     s->block_last_index[n] = i;
     587     1492320 :     return 0;
     588             : }
     589             : 
     590           0 : static int h263_skip_b_part(MpegEncContext *s, int cbp)
     591             : {
     592           0 :     LOCAL_ALIGNED_32(int16_t, dblock, [64]);
     593             :     int i, mbi;
     594             :     int bli[6];
     595             : 
     596             :     /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
     597             :      * but real value should be restored in order to be used later (in OBMC condition)
     598             :      */
     599           0 :     mbi = s->mb_intra;
     600           0 :     memcpy(bli, s->block_last_index, sizeof(bli));
     601           0 :     s->mb_intra = 0;
     602           0 :     for (i = 0; i < 6; i++) {
     603           0 :         if (h263_decode_block(s, dblock, i, cbp&32) < 0)
     604           0 :             return -1;
     605           0 :         cbp+=cbp;
     606             :     }
     607           0 :     s->mb_intra = mbi;
     608           0 :     memcpy(s->block_last_index, bli, sizeof(bli));
     609           0 :     return 0;
     610             : }
     611             : 
     612           0 : static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
     613             : {
     614           0 :     int c, mv = 1;
     615             : 
     616           0 :     if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
     617           0 :         c = get_bits1(gb);
     618           0 :         if (pb_frame == 2 && c)
     619           0 :             mv = !get_bits1(gb);
     620             :     } else { // h.263 Annex M improved PB-frame
     621           0 :         mv = get_unary(gb, 0, 4) + 1;
     622           0 :         c = mv & 1;
     623           0 :         mv = !!(mv & 2);
     624             :     }
     625           0 :     if(c)
     626           0 :         *cbpb = get_bits(gb, 6);
     627           0 :     return mv;
     628             : }
     629             : 
     630             : #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
     631             : #define tab_bias (tab_size / 2)
     632       15407 : static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
     633             : {
     634       15407 :     int xy           = s->block_index[i];
     635       15407 :     uint16_t time_pp = s->pp_time;
     636       15407 :     uint16_t time_pb = s->pb_time;
     637             :     int p_mx, p_my;
     638             : 
     639       15407 :     p_mx = p->motion_val[0][xy][0];
     640       15407 :     if ((unsigned)(p_mx + tab_bias) < tab_size) {
     641       15407 :         s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
     642       15407 :         s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
     643             :     } else {
     644           0 :         s->mv[0][i][0] = p_mx * time_pb / time_pp;
     645           0 :         s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
     646             :     }
     647       15407 :     p_my = p->motion_val[0][xy][1];
     648       15407 :     if ((unsigned)(p_my + tab_bias) < tab_size) {
     649       15407 :         s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
     650       15407 :         s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
     651             :     } else {
     652           0 :         s->mv[0][i][1] = p_my * time_pb / time_pp;
     653           0 :         s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
     654             :     }
     655       15407 : }
     656             : 
     657             : /**
     658             :  * @return the mb_type
     659             :  */
     660       15266 : static int set_direct_mv(MpegEncContext *s)
     661             : {
     662       15266 :     const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
     663       15266 :     Picture *p = &s->next_picture;
     664       15266 :     int colocated_mb_type = p->mb_type[mb_index];
     665             :     int i;
     666             : 
     667       15266 :     if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
     668           0 :         p = &s->last_picture;
     669           0 :         colocated_mb_type = p->mb_type[mb_index];
     670             :     }
     671             : 
     672       15266 :     if (IS_8X8(colocated_mb_type)) {
     673          47 :         s->mv_type = MV_TYPE_8X8;
     674         235 :         for (i = 0; i < 4; i++)
     675         188 :             set_one_direct_mv(s, p, i);
     676          47 :         return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
     677             :     } else {
     678       15219 :         set_one_direct_mv(s, p, 0);
     679       15219 :         s->mv[0][1][0] =
     680       15219 :         s->mv[0][2][0] =
     681       15219 :         s->mv[0][3][0] = s->mv[0][0][0];
     682       15219 :         s->mv[0][1][1] =
     683       15219 :         s->mv[0][2][1] =
     684       15219 :         s->mv[0][3][1] = s->mv[0][0][1];
     685       15219 :         s->mv[1][1][0] =
     686       15219 :         s->mv[1][2][0] =
     687       15219 :         s->mv[1][3][0] = s->mv[1][0][0];
     688       15219 :         s->mv[1][1][1] =
     689       15219 :         s->mv[1][2][1] =
     690       15219 :         s->mv[1][3][1] = s->mv[1][0][1];
     691       15219 :         s->mv_type = MV_TYPE_8X8;
     692             :         // Note see prev line
     693       15219 :         return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
     694             :     }
     695             : }
     696             : 
     697      480738 : int ff_h263_decode_mb(MpegEncContext *s,
     698             :                       int16_t block[6][64])
     699             : {
     700             :     int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
     701             :     int16_t *mot_val;
     702      480738 :     const int xy= s->mb_x + s->mb_y * s->mb_stride;
     703      480738 :     int cbpb = 0, pb_mv_count = 0;
     704             : 
     705             :     av_assert2(!s->h263_pred);
     706             : 
     707      480738 :     if (s->pict_type == AV_PICTURE_TYPE_P) {
     708             :         do{
     709      406113 :             if (get_bits1(&s->gb)) {
     710             :                 /* skip mb */
     711        9321 :                 s->mb_intra = 0;
     712       65247 :                 for(i=0;i<6;i++)
     713       55926 :                     s->block_last_index[i] = -1;
     714        9321 :                 s->mv_dir = MV_DIR_FORWARD;
     715        9321 :                 s->mv_type = MV_TYPE_16X16;
     716        9321 :                 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
     717        9321 :                 s->mv[0][0][0] = 0;
     718        9321 :                 s->mv[0][0][1] = 0;
     719        9321 :                 s->mb_skipped = !(s->obmc | s->loop_filter);
     720        9321 :                 goto end;
     721             :             }
     722      396792 :             cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
     723      396792 :             if (cbpc < 0){
     724           0 :                 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
     725           0 :                 return SLICE_ERROR;
     726             :             }
     727      396792 :         }while(cbpc == 20);
     728             : 
     729      396792 :         s->bdsp.clear_blocks(s->block[0]);
     730             : 
     731      396792 :         dquant = cbpc & 8;
     732      396792 :         s->mb_intra = ((cbpc & 4) != 0);
     733      396792 :         if (s->mb_intra) goto intra;
     734             : 
     735      380054 :         if(s->pb_frame && get_bits1(&s->gb))
     736           0 :             pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
     737      380054 :         cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
     738             : 
     739      380054 :         if (cbpy < 0) {
     740           0 :             av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
     741           0 :             return SLICE_ERROR;
     742             :         }
     743             : 
     744      380054 :         if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
     745      342210 :             cbpy ^= 0xF;
     746             : 
     747      380054 :         cbp = (cbpc & 3) | (cbpy << 2);
     748      380054 :         if (dquant) {
     749           0 :             h263_decode_dquant(s);
     750             :         }
     751             : 
     752      380054 :         s->mv_dir = MV_DIR_FORWARD;
     753      380054 :         if ((cbpc & 16) == 0) {
     754      379011 :             s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
     755             :             /* 16x16 motion prediction */
     756      379011 :             s->mv_type = MV_TYPE_16X16;
     757      379011 :             ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
     758      379011 :             if (s->umvplus)
     759       51649 :                mx = h263p_decode_umotion(s, pred_x);
     760             :             else
     761      327362 :                mx = ff_h263_decode_motion(s, pred_x, 1);
     762             : 
     763      379011 :             if (mx >= 0xffff)
     764           0 :                 return SLICE_ERROR;
     765             : 
     766      379011 :             if (s->umvplus)
     767       51649 :                my = h263p_decode_umotion(s, pred_y);
     768             :             else
     769      327362 :                my = ff_h263_decode_motion(s, pred_y, 1);
     770             : 
     771      379011 :             if (my >= 0xffff)
     772           0 :                 return SLICE_ERROR;
     773      379011 :             s->mv[0][0][0] = mx;
     774      379011 :             s->mv[0][0][1] = my;
     775             : 
     776      379011 :             if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
     777         340 :                skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
     778             :         } else {
     779        1043 :             s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
     780        1043 :             s->mv_type = MV_TYPE_8X8;
     781        5215 :             for(i=0;i<4;i++) {
     782        4172 :                 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
     783        4172 :                 if (s->umvplus)
     784           0 :                     mx = h263p_decode_umotion(s, pred_x);
     785             :                 else
     786        4172 :                     mx = ff_h263_decode_motion(s, pred_x, 1);
     787        4172 :                 if (mx >= 0xffff)
     788           0 :                     return SLICE_ERROR;
     789             : 
     790        4172 :                 if (s->umvplus)
     791           0 :                     my = h263p_decode_umotion(s, pred_y);
     792             :                 else
     793        4172 :                     my = ff_h263_decode_motion(s, pred_y, 1);
     794        4172 :                 if (my >= 0xffff)
     795           0 :                     return SLICE_ERROR;
     796        4172 :                 s->mv[0][i][0] = mx;
     797        4172 :                 s->mv[0][i][1] = my;
     798        4172 :                 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
     799           0 :                   skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
     800        4172 :                 mot_val[0] = mx;
     801        4172 :                 mot_val[1] = my;
     802             :             }
     803             :         }
     804       74625 :     } else if(s->pict_type==AV_PICTURE_TYPE_B) {
     805             :         int mb_type;
     806       21600 :         const int stride= s->b8_stride;
     807       21600 :         int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
     808       21600 :         int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
     809             : //        const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
     810             : 
     811             :         //FIXME ugly
     812       43200 :         mot_val0[0       ]= mot_val0[2       ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
     813       64800 :         mot_val0[1       ]= mot_val0[3       ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
     814       64800 :         mot_val1[0       ]= mot_val1[2       ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
     815       43200 :         mot_val1[1       ]= mot_val1[3       ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
     816             : 
     817             :         do{
     818       21600 :             mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
     819       21600 :             if (mb_type < 0){
     820           0 :                 av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
     821           0 :                 return SLICE_ERROR;
     822             :             }
     823             : 
     824       21600 :             mb_type= h263_mb_type_b_map[ mb_type ];
     825       21600 :         }while(!mb_type);
     826             : 
     827       21600 :         s->mb_intra = IS_INTRA(mb_type);
     828       21600 :         if(HAS_CBP(mb_type)){
     829       11402 :             s->bdsp.clear_blocks(s->block[0]);
     830       11402 :             cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
     831       11402 :             if(s->mb_intra){
     832          46 :                 dquant = IS_QUANT(mb_type);
     833          46 :                 goto intra;
     834             :             }
     835             : 
     836       11356 :             cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
     837             : 
     838       11356 :             if (cbpy < 0){
     839           0 :                 av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
     840           0 :                 return SLICE_ERROR;
     841             :             }
     842             : 
     843       11356 :             if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
     844       11356 :                 cbpy ^= 0xF;
     845             : 
     846       11356 :             cbp = (cbpc & 3) | (cbpy << 2);
     847             :         }else
     848       10198 :             cbp=0;
     849             : 
     850             :         av_assert2(!s->mb_intra);
     851             : 
     852       21554 :         if(IS_QUANT(mb_type)){
     853           0 :             h263_decode_dquant(s);
     854             :         }
     855             : 
     856       21554 :         if(IS_DIRECT(mb_type)){
     857       15266 :             s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
     858       15266 :             mb_type |= set_direct_mv(s);
     859             :         }else{
     860        6288 :             s->mv_dir = 0;
     861        6288 :             s->mv_type= MV_TYPE_16X16;
     862             : //FIXME UMV
     863             : 
     864        6288 :             if(USES_LIST(mb_type, 0)){
     865        2594 :                 int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
     866        2594 :                 s->mv_dir = MV_DIR_FORWARD;
     867             : 
     868        2594 :                 if (s->umvplus)
     869           0 :                     mx = h263p_decode_umotion(s, pred_x);
     870             :                 else
     871        2594 :                     mx = ff_h263_decode_motion(s, pred_x, 1);
     872        2594 :                 if (mx >= 0xffff)
     873           0 :                     return SLICE_ERROR;
     874             : 
     875        2594 :                 if (s->umvplus)
     876           0 :                     my = h263p_decode_umotion(s, pred_y);
     877             :                 else
     878        2594 :                     my = ff_h263_decode_motion(s, pred_y, 1);
     879        2594 :                 if (my >= 0xffff)
     880           0 :                     return SLICE_ERROR;
     881             : 
     882        2594 :                 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
     883           0 :                     skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
     884             : 
     885        2594 :                 s->mv[0][0][0] = mx;
     886        2594 :                 s->mv[0][0][1] = my;
     887        2594 :                 mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
     888        2594 :                 mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
     889             :             }
     890             : 
     891        6288 :             if(USES_LIST(mb_type, 1)){
     892        3694 :                 int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
     893        3694 :                 s->mv_dir |= MV_DIR_BACKWARD;
     894             : 
     895        3694 :                 if (s->umvplus)
     896           0 :                     mx = h263p_decode_umotion(s, pred_x);
     897             :                 else
     898        3694 :                     mx = ff_h263_decode_motion(s, pred_x, 1);
     899        3694 :                 if (mx >= 0xffff)
     900           0 :                     return SLICE_ERROR;
     901             : 
     902        3694 :                 if (s->umvplus)
     903           0 :                     my = h263p_decode_umotion(s, pred_y);
     904             :                 else
     905        3694 :                     my = ff_h263_decode_motion(s, pred_y, 1);
     906        3694 :                 if (my >= 0xffff)
     907           0 :                     return SLICE_ERROR;
     908             : 
     909        3694 :                 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
     910           0 :                     skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
     911             : 
     912        3694 :                 s->mv[1][0][0] = mx;
     913        3694 :                 s->mv[1][0][1] = my;
     914        3694 :                 mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
     915        3694 :                 mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
     916             :             }
     917             :         }
     918             : 
     919       21554 :         s->current_picture.mb_type[xy] = mb_type;
     920             :     } else { /* I-Frame */
     921             :         do{
     922       53025 :             cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
     923       53025 :             if (cbpc < 0){
     924           0 :                 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
     925           0 :                 return SLICE_ERROR;
     926             :             }
     927       53025 :         }while(cbpc == 8);
     928             : 
     929       53025 :         s->bdsp.clear_blocks(s->block[0]);
     930             : 
     931       53025 :         dquant = cbpc & 4;
     932       53025 :         s->mb_intra = 1;
     933       69809 : intra:
     934       69809 :         s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
     935       69809 :         if (s->h263_aic) {
     936       15183 :             s->ac_pred = get_bits1(&s->gb);
     937       15183 :             if(s->ac_pred){
     938         739 :                 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
     939             : 
     940         739 :                 s->h263_aic_dir = get_bits1(&s->gb);
     941             :             }
     942             :         }else
     943       54626 :             s->ac_pred = 0;
     944             : 
     945       69809 :         if(s->pb_frame && get_bits1(&s->gb))
     946           0 :             pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
     947       69809 :         cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
     948       69809 :         if(cbpy<0){
     949           0 :             av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
     950           0 :             return SLICE_ERROR;
     951             :         }
     952       69809 :         cbp = (cbpc & 3) | (cbpy << 2);
     953       69809 :         if (dquant) {
     954           0 :             h263_decode_dquant(s);
     955             :         }
     956             : 
     957       69809 :         pb_mv_count += !!s->pb_frame;
     958             :     }
     959             : 
     960      942834 :     while(pb_mv_count--){
     961           0 :         ff_h263_decode_motion(s, 0, 1);
     962           0 :         ff_h263_decode_motion(s, 0, 1);
     963             :     }
     964             : 
     965             :     /* decode each block */
     966     3299919 :     for (i = 0; i < 6; i++) {
     967     2828502 :         if (h263_decode_block(s, block[i], i, cbp&32) < 0)
     968           0 :             return -1;
     969     2828502 :         cbp+=cbp;
     970             :     }
     971             : 
     972      471417 :     if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
     973           0 :         return -1;
     974      530001 :     if(s->obmc && !s->mb_intra){
     975      150160 :         if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
     976       48550 :             preview_obmc(s);
     977             :     }
     978      903605 : end:
     979             : 
     980      480738 :     if (get_bits_left(&s->gb) < 0)
     981           0 :         return AVERROR_INVALIDDATA;
     982             : 
     983             :         /* per-MB end of slice check */
     984             :     {
     985      480738 :         int v= show_bits(&s->gb, 16);
     986             : 
     987      480738 :         if (get_bits_left(&s->gb) < 16) {
     988        1716 :             v >>= 16 - get_bits_left(&s->gb);
     989             :         }
     990             : 
     991      480738 :         if(v==0)
     992        3842 :             return SLICE_END;
     993             :     }
     994             : 
     995      476896 :     return SLICE_OK;
     996             : }
     997             : 
     998             : /* Most is hardcoded; should extend to handle all H.263 streams. */
     999         461 : int ff_h263_decode_picture_header(MpegEncContext *s)
    1000             : {
    1001             :     int format, width, height, i, ret;
    1002             :     uint32_t startcode;
    1003             : 
    1004         461 :     align_get_bits(&s->gb);
    1005             : 
    1006         461 :     if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
    1007           0 :          av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
    1008             :     }
    1009             : 
    1010         461 :     startcode= get_bits(&s->gb, 22-8);
    1011             : 
    1012         461 :     for(i= get_bits_left(&s->gb); i>24; i-=8) {
    1013         461 :         startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
    1014             : 
    1015         461 :         if(startcode == 0x20)
    1016         461 :             break;
    1017             :     }
    1018             : 
    1019         461 :     if (startcode != 0x20) {
    1020           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
    1021           0 :         return -1;
    1022             :     }
    1023             :     /* temporal reference */
    1024         461 :     i = get_bits(&s->gb, 8); /* picture timestamp */
    1025             : 
    1026         461 :     i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
    1027             : 
    1028         461 :     s->picture_number= (s->picture_number&~0xFF) + i;
    1029             : 
    1030             :     /* PTYPE starts here */
    1031         461 :     if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
    1032           0 :         return -1;
    1033             :     }
    1034         461 :     if (get_bits1(&s->gb) != 0) {
    1035           0 :         av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
    1036           0 :         return -1;      /* H.263 id */
    1037             :     }
    1038         461 :     skip_bits1(&s->gb);         /* split screen off */
    1039         461 :     skip_bits1(&s->gb);         /* camera  off */
    1040         461 :     skip_bits1(&s->gb);         /* freeze picture release off */
    1041             : 
    1042         461 :     format = get_bits(&s->gb, 3);
    1043             :     /*
    1044             :         0    forbidden
    1045             :         1    sub-QCIF
    1046             :         10   QCIF
    1047             :         7       extended PTYPE (PLUSPTYPE)
    1048             :     */
    1049             : 
    1050         461 :     if (format != 7 && format != 6) {
    1051         307 :         s->h263_plus = 0;
    1052             :         /* H.263v1 */
    1053         307 :         width = ff_h263_format[format][0];
    1054         307 :         height = ff_h263_format[format][1];
    1055         307 :         if (!width)
    1056           0 :             return -1;
    1057             : 
    1058         307 :         s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
    1059             : 
    1060         307 :         s->h263_long_vectors = get_bits1(&s->gb);
    1061             : 
    1062         307 :         if (get_bits1(&s->gb) != 0) {
    1063           0 :             av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
    1064           0 :             return -1; /* SAC: off */
    1065             :         }
    1066         307 :         s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
    1067         307 :         s->unrestricted_mv = s->h263_long_vectors || s->obmc;
    1068             : 
    1069         307 :         s->pb_frame = get_bits1(&s->gb);
    1070         307 :         s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
    1071         307 :         skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
    1072             : 
    1073         307 :         s->width = width;
    1074         307 :         s->height = height;
    1075         307 :         s->avctx->sample_aspect_ratio= (AVRational){12,11};
    1076         307 :         s->avctx->framerate = (AVRational){ 30000, 1001 };
    1077             :     } else {
    1078             :         int ufep;
    1079             : 
    1080             :         /* H.263v2 */
    1081         154 :         s->h263_plus = 1;
    1082         154 :         ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
    1083             : 
    1084             :         /* ufep other than 0 and 1 are reserved */
    1085         154 :         if (ufep == 1) {
    1086             :             /* OPPTYPE */
    1087         154 :             format = get_bits(&s->gb, 3);
    1088             :             ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
    1089         154 :             s->custom_pcf= get_bits1(&s->gb);
    1090         154 :             s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
    1091         154 :             if (get_bits1(&s->gb) != 0) {
    1092           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
    1093             :             }
    1094         154 :             s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
    1095         154 :             s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
    1096         154 :             s->loop_filter= get_bits1(&s->gb);
    1097         154 :             s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
    1098         154 :             if(s->avctx->lowres)
    1099           0 :                 s->loop_filter = 0;
    1100             : 
    1101         154 :             s->h263_slice_structured= get_bits1(&s->gb);
    1102         154 :             if (get_bits1(&s->gb) != 0) {
    1103           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
    1104             :             }
    1105         154 :             if (get_bits1(&s->gb) != 0) {
    1106           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
    1107             :             }
    1108         154 :             s->alt_inter_vlc= get_bits1(&s->gb);
    1109         154 :             s->modified_quant= get_bits1(&s->gb);
    1110         154 :             if(s->modified_quant)
    1111         154 :                 s->chroma_qscale_table= ff_h263_chroma_qscale_table;
    1112             : 
    1113         154 :             skip_bits(&s->gb, 1); /* Prevent start code emulation */
    1114             : 
    1115         154 :             skip_bits(&s->gb, 3); /* Reserved */
    1116           0 :         } else if (ufep != 0) {
    1117           0 :             av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
    1118           0 :             return -1;
    1119             :         }
    1120             : 
    1121             :         /* MPPTYPE */
    1122         154 :         s->pict_type = get_bits(&s->gb, 3);
    1123         154 :         switch(s->pict_type){
    1124          19 :         case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
    1125         135 :         case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
    1126           0 :         case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
    1127           0 :         case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
    1128           0 :         case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
    1129           0 :         default:
    1130           0 :             return -1;
    1131             :         }
    1132         154 :         skip_bits(&s->gb, 2);
    1133         154 :         s->no_rounding = get_bits1(&s->gb);
    1134         154 :         skip_bits(&s->gb, 4);
    1135             : 
    1136             :         /* Get the picture dimensions */
    1137         154 :         if (ufep) {
    1138         154 :             if (format == 6) {
    1139             :                 /* Custom Picture Format (CPFMT) */
    1140           0 :                 s->aspect_ratio_info = get_bits(&s->gb, 4);
    1141             :                 ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
    1142             :                 /* aspect ratios:
    1143             :                 0 - forbidden
    1144             :                 1 - 1:1
    1145             :                 2 - 12:11 (CIF 4:3)
    1146             :                 3 - 10:11 (525-type 4:3)
    1147             :                 4 - 16:11 (CIF 16:9)
    1148             :                 5 - 40:33 (525-type 16:9)
    1149             :                 6-14 - reserved
    1150             :                 */
    1151           0 :                 width = (get_bits(&s->gb, 9) + 1) * 4;
    1152           0 :                 check_marker(s->avctx, &s->gb, "in dimensions");
    1153           0 :                 height = get_bits(&s->gb, 9) * 4;
    1154             :                 ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
    1155           0 :                 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
    1156             :                     /* expected dimensions */
    1157           0 :                     s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
    1158           0 :                     s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
    1159             :                 }else{
    1160           0 :                     s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
    1161             :                 }
    1162             :             } else {
    1163         154 :                 width = ff_h263_format[format][0];
    1164         154 :                 height = ff_h263_format[format][1];
    1165         154 :                 s->avctx->sample_aspect_ratio= (AVRational){12,11};
    1166             :             }
    1167         154 :             s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
    1168         154 :             if ((width == 0) || (height == 0))
    1169           0 :                 return -1;
    1170         154 :             s->width = width;
    1171         154 :             s->height = height;
    1172             : 
    1173         154 :             if(s->custom_pcf){
    1174             :                 int gcd;
    1175         154 :                 s->avctx->framerate.num  = 1800000;
    1176         154 :                 s->avctx->framerate.den  = 1000 + get_bits1(&s->gb);
    1177         154 :                 s->avctx->framerate.den *= get_bits(&s->gb, 7);
    1178         154 :                 if(s->avctx->framerate.den == 0){
    1179           0 :                     av_log(s, AV_LOG_ERROR, "zero framerate\n");
    1180           0 :                     return -1;
    1181             :                 }
    1182         154 :                 gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
    1183         154 :                 s->avctx->framerate.den /= gcd;
    1184         154 :                 s->avctx->framerate.num /= gcd;
    1185             :             }else{
    1186           0 :                 s->avctx->framerate = (AVRational){ 30000, 1001 };
    1187             :             }
    1188             :         }
    1189             : 
    1190         154 :         if(s->custom_pcf){
    1191         154 :             skip_bits(&s->gb, 2); //extended Temporal reference
    1192             :         }
    1193             : 
    1194         154 :         if (ufep) {
    1195         154 :             if (s->umvplus) {
    1196         154 :                 if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
    1197         154 :                     skip_bits1(&s->gb);
    1198             :             }
    1199         154 :             if(s->h263_slice_structured){
    1200           0 :                 if (get_bits1(&s->gb) != 0) {
    1201           0 :                     av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
    1202             :                 }
    1203           0 :                 if (get_bits1(&s->gb) != 0) {
    1204           0 :                     av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
    1205             :                 }
    1206             :             }
    1207         154 :             if (s->pict_type == AV_PICTURE_TYPE_B) {
    1208           0 :                 skip_bits(&s->gb, 4); //ELNUM
    1209           0 :                 if (ufep == 1) {
    1210           0 :                     skip_bits(&s->gb, 4); // RLNUM
    1211             :                 }
    1212             :             }
    1213             :         }
    1214             : 
    1215         154 :         s->qscale = get_bits(&s->gb, 5);
    1216             :     }
    1217             : 
    1218         461 :     if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
    1219           0 :         return ret;
    1220             : 
    1221         461 :     s->mb_width = (s->width  + 15) / 16;
    1222         461 :     s->mb_height = (s->height  + 15) / 16;
    1223         461 :     s->mb_num = s->mb_width * s->mb_height;
    1224             : 
    1225         461 :     if (s->pb_frame) {
    1226           0 :         skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
    1227           0 :         if (s->custom_pcf)
    1228           0 :             skip_bits(&s->gb, 2); //extended Temporal reference
    1229           0 :         skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
    1230             :     }
    1231             : 
    1232         461 :     if (s->pict_type!=AV_PICTURE_TYPE_B) {
    1233         461 :         s->time            = s->picture_number;
    1234         461 :         s->pp_time         = s->time - s->last_non_b_time;
    1235         461 :         s->last_non_b_time = s->time;
    1236             :     }else{
    1237           0 :         s->time    = s->picture_number;
    1238           0 :         s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
    1239           0 :         if (s->pp_time <=s->pb_time ||
    1240           0 :             s->pp_time <= s->pp_time - s->pb_time ||
    1241           0 :             s->pp_time <= 0){
    1242           0 :             s->pp_time = 2;
    1243           0 :             s->pb_time = 1;
    1244             :         }
    1245           0 :         ff_mpeg4_init_direct_mv(s);
    1246             :     }
    1247             : 
    1248             :     /* PEI */
    1249         461 :     if (skip_1stop_8data_bits(&s->gb) < 0)
    1250           0 :         return AVERROR_INVALIDDATA;
    1251             : 
    1252         461 :     if(s->h263_slice_structured){
    1253           0 :         if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
    1254           0 :             return -1;
    1255             :         }
    1256             : 
    1257           0 :         ff_h263_decode_mba(s);
    1258             : 
    1259           0 :         if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
    1260           0 :             return -1;
    1261             :         }
    1262             :     }
    1263         461 :     s->f_code = 1;
    1264             : 
    1265         461 :     if (s->pict_type == AV_PICTURE_TYPE_B)
    1266           0 :         s->low_delay = 0;
    1267             : 
    1268         461 :     if(s->h263_aic){
    1269         154 :          s->y_dc_scale_table=
    1270         154 :          s->c_dc_scale_table= ff_aic_dc_scale_table;
    1271             :     }else{
    1272         307 :         s->y_dc_scale_table=
    1273         307 :         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
    1274             :     }
    1275             : 
    1276         461 :         ff_h263_show_pict_info(s);
    1277         461 :     if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
    1278             :         int i,j;
    1279           0 :         for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
    1280           0 :         av_log(s->avctx, AV_LOG_DEBUG, "\n");
    1281           0 :         for(i=0; i<13; i++){
    1282           0 :             for(j=0; j<3; j++){
    1283           0 :                 int v= get_bits(&s->gb, 8);
    1284           0 :                 v |= get_sbits(&s->gb, 8)<<8;
    1285           0 :                 av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
    1286             :             }
    1287           0 :             av_log(s->avctx, AV_LOG_DEBUG, "\n");
    1288             :         }
    1289           0 :         for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
    1290             :     }
    1291             : 
    1292         461 :     return 0;
    1293             : }

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