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FFmpeg/libavcodec/msmpeg4dec.c

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  1. /*

  2.  * MSMPEG4 backend for encoder and decoder

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * msmpeg4v1 & v2 stuff by 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. #include "avcodec.h"

  26. #include "internal.h"

  27. #include "mpegutils.h"

  28. #include "mpegvideo.h"

  29. #include "msmpeg4.h"

  30. #include "libavutil/imgutils.h"

  31. #include "h263.h"

  32. #include "mpeg4video.h"

  33. #include "msmpeg4data.h"

  34. #include "vc1data.h"

  35. #include "wmv2.h"

  36. 

  37. #define DC_VLC_BITS 9

  38. #define V2_INTRA_CBPC_VLC_BITS 3

  39. #define V2_MB_TYPE_VLC_BITS 7

  40. #define MV_VLC_BITS 9

  41. #define TEX_VLC_BITS 9

  42. 

  43. #define DEFAULT_INTER_INDEX 3

  44. 

  45. static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,

  46.                                     int32_t **dc_val_ptr)

  47. {

  48.     int i;

  49. 

  50.     if (n < 4) {

  51.         i= 0;

  52.     } else {

  53.         i= n-3;

  54.     }

  55. 

  56.     *dc_val_ptr= &s->last_dc[i];

  57.     return s->last_dc[i];

  58. }

  59. 

  60. /****************************************/

  61. /* decoding stuff */

  62. 

  63. VLC ff_mb_non_intra_vlc[4];

  64. static VLC v2_dc_lum_vlc;

  65. static VLC v2_dc_chroma_vlc;

  66. static VLC v2_intra_cbpc_vlc;

  67. static VLC v2_mb_type_vlc;

  68. VLC ff_inter_intra_vlc;

  69. 

  70. /* This is identical to H.263 except that its range is multiplied by 2. */

  71. static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)

  72. {

  73.     int code, val, sign, shift;

  74. 

  75.     code = get_vlc2(&s->gb, ff_h263_mv_vlc.table, H263_MV_VLC_BITS, 2);

  76.     ff_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);

  77.     if (code < 0)

  78.         return 0xffff;

  79. 

  80.     if (code == 0)

  81.         return pred;

  82.     sign = get_bits1(&s->gb);

  83.     shift = f_code - 1;

  84.     val = code;

  85.     if (shift) {

  86.         val = (val - 1) << shift;

  87.         val |= get_bits(&s->gb, shift);

  88.         val++;

  89.     }

  90.     if (sign)

  91.         val = -val;

  92. 

  93.     val += pred;

  94.     if (val <= -64)

  95.         val += 64;

  96.     else if (val >= 64)

  97.         val -= 64;

  98. 

  99.     return val;

  100. }

  101. 

  102. static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])

  103. {

  104.     int cbp, code, i;

  105.     uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];

  106. 

  107.     if (s->pict_type == AV_PICTURE_TYPE_P) {

  108.         if (s->use_skip_mb_code) {

  109.             if (get_bits1(&s->gb)) {

  110.                 /* skip mb */

  111.                 s->mb_intra = 0;

  112.                 for(i=0;i<6;i++)

  113.                     s->block_last_index[i] = -1;

  114.                 s->mv_dir = MV_DIR_FORWARD;

  115.                 s->mv_type = MV_TYPE_16X16;

  116.                 s->mv[0][0][0] = 0;

  117.                 s->mv[0][0][1] = 0;

  118.                 s->mb_skipped = 1;

  119.                 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;

  120.                 return 0;

  121.             }

  122.         }

  123. 

  124.         if(s->msmpeg4_version==2)

  125.             code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);

  126.         else

  127.             code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);

  128.         if(code<0 || code>7){

  129.             av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);

  130.             return -1;

  131.         }

  132. 

  133.         s->mb_intra = code >>2;

  134. 

  135.         cbp = code & 0x3;

  136.     } else {

  137.         s->mb_intra = 1;

  138.         if(s->msmpeg4_version==2)

  139.             cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);

  140.         else

  141.             cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);

  142.         if(cbp<0 || cbp>3){

  143.             av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);

  144.             return -1;

  145.         }

  146.     }

  147. 

  148.     if (!s->mb_intra) {

  149.         int mx, my, cbpy;

  150. 

  151.         cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

  152.         if(cbpy<0){

  153.             av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);

  154.             return -1;

  155.         }

  156. 

  157.         cbp|= cbpy<<2;

  158.         if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;

  159. 

  160.         ff_h263_pred_motion(s, 0, 0, &mx, &my);

  161.         mx= msmpeg4v2_decode_motion(s, mx, 1);

  162.         my= msmpeg4v2_decode_motion(s, my, 1);

  163. 

  164.         s->mv_dir = MV_DIR_FORWARD;

  165.         s->mv_type = MV_TYPE_16X16;

  166.         s->mv[0][0][0] = mx;

  167.         s->mv[0][0][1] = my;

  168.         *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;

  169.     } else {

  170.         int v;

  171.         if(s->msmpeg4_version==2){

  172.             s->ac_pred = get_bits1(&s->gb);

  173.             v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

  174.             if (v < 0) {

  175.                 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");

  176.                 return -1;

  177.             }

  178.             cbp|= v<<2;

  179.         } else{

  180.             s->ac_pred = 0;

  181.             v = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

  182.             if (v < 0) {

  183.                 av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");

  184.                 return -1;

  185.             }

  186.             cbp|= v<<2;

  187.             if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;

  188.         }

  189.         *mb_type_ptr = MB_TYPE_INTRA;

  190.     }

  191. 

  192.     s->bdsp.clear_blocks(s->block[0]);

  193.     for (i = 0; i < 6; i++) {

  194.         if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)

  195.         {

  196.              av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);

  197.              return -1;

  198.         }

  199.     }

  200.     return 0;

  201. }

  202. 

  203. static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])

  204. {

  205.     int cbp, code, i;

  206.     uint8_t *coded_val;

  207.     uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];

  208. 

  209.     if (get_bits_left(&s->gb) <= 0)

  210.         return AVERROR_INVALIDDATA;

  211. 

  212.     if (s->pict_type == AV_PICTURE_TYPE_P) {

  213.         if (s->use_skip_mb_code) {

  214.             if (get_bits1(&s->gb)) {

  215.                 /* skip mb */

  216.                 s->mb_intra = 0;

  217.                 for(i=0;i<6;i++)

  218.                     s->block_last_index[i] = -1;

  219.                 s->mv_dir = MV_DIR_FORWARD;

  220.                 s->mv_type = MV_TYPE_16X16;

  221.                 s->mv[0][0][0] = 0;

  222.                 s->mv[0][0][1] = 0;

  223.                 s->mb_skipped = 1;

  224.                 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;

  225. 

  226.                 return 0;

  227.             }

  228.         }

  229. 

  230.         code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);

  231.         //s->mb_intra = (code & 0x40) ? 0 : 1;

  232.         s->mb_intra = (~code & 0x40) >> 6;

  233. 

  234.         cbp = code & 0x3f;

  235.     } else {

  236.         s->mb_intra = 1;

  237.         code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  238.         /* predict coded block pattern */

  239.         cbp = 0;

  240.         for(i=0;i<6;i++) {

  241.             int val = ((code >> (5 - i)) & 1);

  242.             if (i < 4) {

  243.                 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);

  244.                 val = val ^ pred;

  245.                 *coded_val = val;

  246.             }

  247.             cbp |= val << (5 - i);

  248.         }

  249.     }

  250. 

  251.     if (!s->mb_intra) {

  252.         int mx, my;

  253.         if(s->per_mb_rl_table && cbp){

  254.             s->rl_table_index = decode012(&s->gb);

  255.             s->rl_chroma_table_index = s->rl_table_index;

  256.         }

  257.         ff_h263_pred_motion(s, 0, 0, &mx, &my);

  258.         ff_msmpeg4_decode_motion(s, &mx, &my);

  259.         s->mv_dir = MV_DIR_FORWARD;

  260.         s->mv_type = MV_TYPE_16X16;

  261.         s->mv[0][0][0] = mx;

  262.         s->mv[0][0][1] = my;

  263.         *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;

  264.     } else {

  265.         ff_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,

  266.                 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),

  267.                 show_bits(&s->gb, 24));

  268.         s->ac_pred = get_bits1(&s->gb);

  269.         *mb_type_ptr = MB_TYPE_INTRA;

  270.         if(s->inter_intra_pred){

  271.             s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);

  272.             ff_dlog(s, "%d%d %d %d/",

  273.                     s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);

  274.         }

  275.         if(s->per_mb_rl_table && cbp){

  276.             s->rl_table_index = decode012(&s->gb);

  277.             s->rl_chroma_table_index = s->rl_table_index;

  278.         }

  279.     }

  280. 

  281.     s->bdsp.clear_blocks(s->block[0]);

  282.     for (i = 0; i < 6; i++) {

  283.         if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)

  284.         {

  285.             av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);

  286.             return -1;

  287.         }

  288.     }

  289. 

  290.     return 0;

  291. }

  292. 

  293. /* init all vlc decoding tables */

  294. av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)

  295. {

  296.     MpegEncContext *s = avctx->priv_data;

  297.     static volatile int done = 0;

  298.     int i, ret;

  299.     MVTable *mv;

  300. 

  301.     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)

  302.         return ret;

  303. 

  304.     if (ff_h263_decode_init(avctx) < 0)

  305.         return -1;

  306. 

  307.     ff_msmpeg4_common_init(s);

  308. 

  309.     if (!done) {

  310.         for(i=0;i<NB_RL_TABLES;i++) {

  311.             ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);

  312.         }

  313.         INIT_FIRST_VLC_RL(ff_rl_table[0], 642);

  314.         INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);

  315.         INIT_FIRST_VLC_RL(ff_rl_table[2], 554);

  316.         INIT_VLC_RL(ff_rl_table[3], 940);

  317.         INIT_VLC_RL(ff_rl_table[4], 962);

  318.         /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been

  319.          * initialized in ff_h263_decode_init() above. So just copy the VLCs. */

  320.         av_assert1(ff_h263_rl_inter.rl_vlc[0]);

  321.         memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc));

  322. 

  323.         mv = &ff_mv_tables[0];

  324.         INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1,

  325.                     mv->table_mv_bits, 1, 1,

  326.                     mv->table_mv_code, 2, 2, 3714);

  327.         mv = &ff_mv_tables[1];

  328.         INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1,

  329.                     mv->table_mv_bits, 1, 1,

  330.                     mv->table_mv_code, 2, 2, 2694);

  331. 

  332.         INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,

  333.                  &ff_table0_dc_lum[0][1], 8, 4,

  334.                  &ff_table0_dc_lum[0][0], 8, 4, 1158);

  335.         INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,

  336.                  &ff_table0_dc_chroma[0][1], 8, 4,

  337.                  &ff_table0_dc_chroma[0][0], 8, 4, 1118);

  338.         INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,

  339.                  &ff_table1_dc_lum[0][1], 8, 4,

  340.                  &ff_table1_dc_lum[0][0], 8, 4, 1476);

  341.         INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,

  342.                  &ff_table1_dc_chroma[0][1], 8, 4,

  343.                  &ff_table1_dc_chroma[0][0], 8, 4, 1216);

  344. 

  345.         INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,

  346.                  &ff_v2_dc_lum_table[0][1], 8, 4,

  347.                  &ff_v2_dc_lum_table[0][0], 8, 4, 1472);

  348.         INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,

  349.                  &ff_v2_dc_chroma_table[0][1], 8, 4,

  350.                  &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);

  351. 

  352.         INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,

  353.                  &ff_v2_intra_cbpc[0][1], 2, 1,

  354.                  &ff_v2_intra_cbpc[0][0], 2, 1, 8);

  355.         INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,

  356.                  &ff_v2_mb_type[0][1], 2, 1,

  357.                  &ff_v2_mb_type[0][0], 2, 1, 128);

  358. 

  359.         INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,

  360.                      &ff_wmv2_inter_table[0][0][1], 8, 4,

  361.                      &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);

  362.         INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,

  363.                      &ff_wmv2_inter_table[1][0][1], 8, 4,

  364.                      &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);

  365.         INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,

  366.                      &ff_wmv2_inter_table[2][0][1], 8, 4,

  367.                      &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);

  368.         INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,

  369.                      &ff_wmv2_inter_table[3][0][1], 8, 4,

  370.                      &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);

  371. 

  372.         INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

  373.                  &ff_msmp4_mb_i_table[0][1], 4, 2,

  374.                  &ff_msmp4_mb_i_table[0][0], 4, 2, 536);

  375. 

  376.         INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,

  377.                  &ff_table_inter_intra[0][1], 2, 1,

  378.                  &ff_table_inter_intra[0][0], 2, 1, 8);

  379.         done = 1;

  380.     }

  381. 

  382.     switch(s->msmpeg4_version){

  383.     case 1:

  384.     case 2:

  385.         s->decode_mb= msmpeg4v12_decode_mb;

  386.         break;

  387.     case 3:

  388.     case 4:

  389.         s->decode_mb= msmpeg4v34_decode_mb;

  390.         break;

  391.     case 5:

  392.         if (CONFIG_WMV2_DECODER)

  393.             s->decode_mb= ff_wmv2_decode_mb;

  394.     case 6:

  395.         //FIXME + TODO VC1 decode mb

  396.         break;

  397.     }

  398. 

  399.     s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe

  400. 

  401.     return 0;

  402. }

  403. 

  404. int ff_msmpeg4_decode_picture_header(MpegEncContext * s)

  405. {

  406.     int code;

  407. 

  408.     // at minimum one bit per macroblock is required at least in a valid frame,

  409.     // we discard frames much smaller than this. Frames smaller than 1/8 of the

  410.     // smallest "black/skip" frame generally contain not much recoverable content

  411.     // while at the same time they have the highest computational requirements

  412.     // per byte

  413.     if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))

  414.         return AVERROR_INVALIDDATA;

  415. 

  416.     if(s->msmpeg4_version==1){

  417.         int start_code = get_bits_long(&s->gb, 32);

  418.         if(start_code!=0x00000100){

  419.             av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");

  420.             return -1;

  421.         }

  422. 

  423.         skip_bits(&s->gb, 5); // frame number */

  424.     }

  425. 

  426.     s->pict_type = get_bits(&s->gb, 2) + 1;

  427.     if (s->pict_type != AV_PICTURE_TYPE_I &&

  428.         s->pict_type != AV_PICTURE_TYPE_P){

  429.         av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");

  430.         return -1;

  431.     }

  432.     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);

  433.     if(s->qscale==0){

  434.         av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");

  435.         return -1;

  436.     }

  437. 

  438.     if (s->pict_type == AV_PICTURE_TYPE_I) {

  439.         code = get_bits(&s->gb, 5);

  440.         if(s->msmpeg4_version==1){

  441.             if(code==0 || code>s->mb_height){

  442.                 av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);

  443.                 return -1;

  444.             }

  445. 

  446.             s->slice_height = code;

  447.         }else{

  448.             /* 0x17: one slice, 0x18: two slices, ... */

  449.             if (code < 0x17){

  450.                 av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);

  451.                 return -1;

  452.             }

  453. 

  454.             s->slice_height = s->mb_height / (code - 0x16);

  455.         }

  456. 

  457.         switch(s->msmpeg4_version){

  458.         case 1:

  459.         case 2:

  460.             s->rl_chroma_table_index = 2;

  461.             s->rl_table_index = 2;

  462. 

  463.             s->dc_table_index = 0; //not used

  464.             break;

  465.         case 3:

  466.             s->rl_chroma_table_index = decode012(&s->gb);

  467.             s->rl_table_index = decode012(&s->gb);

  468. 

  469.             s->dc_table_index = get_bits1(&s->gb);

  470.             break;

  471.         case 4:

  472.             ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);

  473. 

  474.             if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);

  475.             else                           s->per_mb_rl_table= 0;

  476. 

  477.             if(!s->per_mb_rl_table){

  478.                 s->rl_chroma_table_index = decode012(&s->gb);

  479.                 s->rl_table_index = decode012(&s->gb);

  480.             }

  481. 

  482.             s->dc_table_index = get_bits1(&s->gb);

  483.             s->inter_intra_pred= 0;

  484.             break;

  485.         }

  486.         s->no_rounding = 1;

  487.         if(s->avctx->debug&FF_DEBUG_PICT_INFO)

  488.             av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d   \n",

  489.                 s->qscale,

  490.                 s->rl_chroma_table_index,

  491.                 s->rl_table_index,

  492.                 s->dc_table_index,

  493.                 s->per_mb_rl_table,

  494.                 s->slice_height);

  495.     } else {

  496.         switch(s->msmpeg4_version){

  497.         case 1:

  498.         case 2:

  499.             if(s->msmpeg4_version==1)

  500.                 s->use_skip_mb_code = 1;

  501.             else

  502.                 s->use_skip_mb_code = get_bits1(&s->gb);

  503.             s->rl_table_index = 2;

  504.             s->rl_chroma_table_index = s->rl_table_index;

  505.             s->dc_table_index = 0; //not used

  506.             s->mv_table_index = 0;

  507.             break;

  508.         case 3:

  509.             s->use_skip_mb_code = get_bits1(&s->gb);

  510.             s->rl_table_index = decode012(&s->gb);

  511.             s->rl_chroma_table_index = s->rl_table_index;

  512. 

  513.             s->dc_table_index = get_bits1(&s->gb);

  514. 

  515.             s->mv_table_index = get_bits1(&s->gb);

  516.             break;

  517.         case 4:

  518.             s->use_skip_mb_code = get_bits1(&s->gb);

  519. 

  520.             if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);

  521.             else                           s->per_mb_rl_table= 0;

  522. 

  523.             if(!s->per_mb_rl_table){

  524.                 s->rl_table_index = decode012(&s->gb);

  525.                 s->rl_chroma_table_index = s->rl_table_index;

  526.             }

  527. 

  528.             s->dc_table_index = get_bits1(&s->gb);

  529. 

  530.             s->mv_table_index = get_bits1(&s->gb);

  531.             s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);

  532.             break;

  533.         }

  534. 

  535.         if(s->avctx->debug&FF_DEBUG_PICT_INFO)

  536.             av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d   \n",

  537.                 s->use_skip_mb_code,

  538.                 s->rl_table_index,

  539.                 s->rl_chroma_table_index,

  540.                 s->dc_table_index,

  541.                 s->mv_table_index,

  542.                 s->per_mb_rl_table,

  543.                 s->qscale);

  544. 

  545.         if(s->flipflop_rounding){

  546.             s->no_rounding ^= 1;

  547.         }else{

  548.             s->no_rounding = 0;

  549.         }

  550.     }

  551.     ff_dlog(s->avctx, "%d %"PRId64" %d %d %d\n", s->pict_type, s->bit_rate,

  552.             s->inter_intra_pred, s->width, s->height);

  553. 

  554.     s->esc3_level_length= 0;

  555.     s->esc3_run_length= 0;

  556. 

  557.     return 0;

  558. }

  559. 

  560. int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)

  561. {

  562.     int left= buf_size*8 - get_bits_count(&s->gb);

  563.     int length= s->msmpeg4_version>=3 ? 17 : 16;

  564.     /* the alt_bitstream reader could read over the end so we need to check it */

  565.     if(left>=length && left<length+8)

  566.     {

  567.         skip_bits(&s->gb, 5); /* fps */

  568.         s->bit_rate= get_bits(&s->gb, 11)*1024;

  569.         if(s->msmpeg4_version>=3)

  570.             s->flipflop_rounding= get_bits1(&s->gb);

  571.         else

  572.             s->flipflop_rounding= 0;

  573.     }

  574.     else if(left<length+8)

  575.     {

  576.         s->flipflop_rounding= 0;

  577.         if(s->msmpeg4_version != 2)

  578.             av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);

  579.     }

  580.     else

  581.     {

  582.         av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");

  583.     }

  584. 

  585.     return 0;

  586. }

  587. 

  588. static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)

  589. {

  590.     int level, pred;

  591. 

  592.     if(s->msmpeg4_version<=2){

  593.         if (n < 4) {

  594.             level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);

  595.         } else {

  596.             level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);

  597.         }

  598.         if (level < 0) {

  599.             av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");

  600.             *dir_ptr = 0;

  601.             return -1;

  602.         }

  603.         level-=256;

  604.     }else{  //FIXME optimize use unified tables & index

  605.         if (n < 4) {

  606.             level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  607.         } else {

  608.             level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  609.         }

  610. 

  611.         if (level == DC_MAX) {

  612.             level = get_bits(&s->gb, 8);

  613.             if (get_bits1(&s->gb))

  614.                 level = -level;

  615.         } else if (level != 0) {

  616.             if (get_bits1(&s->gb))

  617.                 level = -level;

  618.         }

  619.     }

  620. 

  621.     if(s->msmpeg4_version==1){

  622.         int32_t *dc_val;

  623.         pred = msmpeg4v1_pred_dc(s, n, &dc_val);

  624.         level += pred;

  625. 

  626.         /* update predictor */

  627.         *dc_val= level;

  628.     }else{

  629.         int16_t *dc_val;

  630.         pred   = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);

  631.         level += pred;

  632. 

  633.         /* update predictor */

  634.         if (n < 4) {

  635.             *dc_val = level * s->y_dc_scale;

  636.         } else {

  637.             *dc_val = level * s->c_dc_scale;

  638.         }

  639.     }

  640. 

  641.     return level;

  642. }

  643. 

  644. int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,

  645.                               int n, int coded, const uint8_t *scan_table)

  646. {

  647.     int level, i, last, run, run_diff;

  648.     int av_uninit(dc_pred_dir);

  649.     RLTable *rl;

  650.     RL_VLC_ELEM *rl_vlc;

  651.     int qmul, qadd;

  652. 

  653.     if (s->mb_intra) {

  654.         qmul=1;

  655.         qadd=0;

  656. 

  657.         /* DC coef */

  658.         level = msmpeg4_decode_dc(s, n, &dc_pred_dir);

  659. 

  660.         if (level < 0){

  661.             av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);

  662.             if(s->inter_intra_pred) level=0;

  663.         }

  664.         if (n < 4) {

  665.             rl = &ff_rl_table[s->rl_table_index];

  666.             if(level > 256*s->y_dc_scale){

  667.                 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);

  668.                 if(!s->inter_intra_pred) return -1;

  669.             }

  670.         } else {

  671.             rl = &ff_rl_table[3 + s->rl_chroma_table_index];

  672.             if(level > 256*s->c_dc_scale){

  673.                 av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);

  674.                 if(!s->inter_intra_pred) return -1;

  675.             }

  676.         }

  677.         block[0] = level;

  678. 

  679.         run_diff = s->msmpeg4_version >= 4;

  680.         i = 0;

  681.         if (!coded) {

  682.             goto not_coded;

  683.         }

  684.         if (s->ac_pred) {

  685.             if (dc_pred_dir == 0)

  686.                 scan_table = s->intra_v_scantable.permutated; /* left */

  687.             else

  688.                 scan_table = s->intra_h_scantable.permutated; /* top */

  689.         } else {

  690.             scan_table = s->intra_scantable.permutated;

  691.         }

  692.         rl_vlc= rl->rl_vlc[0];

  693.     } else {

  694.         qmul = s->qscale << 1;

  695.         qadd = (s->qscale - 1) | 1;

  696.         i = -1;

  697.         rl = &ff_rl_table[3 + s->rl_table_index];

  698. 

  699.         if(s->msmpeg4_version==2)

  700.             run_diff = 0;

  701.         else

  702.             run_diff = 1;

  703. 

  704.         if (!coded) {

  705.             s->block_last_index[n] = i;

  706.             return 0;

  707.         }

  708.         if(!scan_table)

  709.             scan_table = s->inter_scantable.permutated;

  710.         rl_vlc= rl->rl_vlc[s->qscale];

  711.     }

  712.   {

  713.     OPEN_READER(re, &s->gb);

  714.     for(;;) {

  715.         UPDATE_CACHE(re, &s->gb);

  716.         GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);

  717.         if (level==0) {

  718.             int cache;

  719.             cache= GET_CACHE(re, &s->gb);

  720.             /* escape */

  721.             if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {

  722.                 if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {

  723.                     /* third escape */

  724.                     if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);

  725.                     UPDATE_CACHE(re, &s->gb);

  726.                     if(s->msmpeg4_version<=3){

  727.                         last=  SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);

  728.                         run=   SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);

  729.                         level= SHOW_SBITS(re, &s->gb, 8);

  730.                         SKIP_COUNTER(re, &s->gb, 1+6+8);

  731.                     }else{

  732.                         int sign;

  733.                         last=  SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);

  734.                         if(!s->esc3_level_length){

  735.                             int ll;

  736.                             ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",

  737.                                     show_bits(&s->gb, 24), s->mb_x, s->mb_y);

  738.                             if(s->qscale<8){

  739.                                 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);

  740.                                 if(ll==0){

  741.                                     ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);

  742.                                 }

  743.                             }else{

  744.                                 ll=2;

  745.                                 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){

  746.                                     ll++;

  747.                                     SKIP_BITS(re, &s->gb, 1);

  748.                                 }

  749.                                 if(ll<8) SKIP_BITS(re, &s->gb, 1);

  750.                             }

  751. 

  752.                             s->esc3_level_length= ll;

  753.                             s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);

  754.                             UPDATE_CACHE(re, &s->gb);

  755.                         }

  756.                         run=   SHOW_UBITS(re, &s->gb, s->esc3_run_length);

  757.                         SKIP_BITS(re, &s->gb, s->esc3_run_length);

  758. 

  759.                         sign=  SHOW_UBITS(re, &s->gb, 1);

  760.                         SKIP_BITS(re, &s->gb, 1);

  761. 

  762.                         level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);

  763.                         SKIP_BITS(re, &s->gb, s->esc3_level_length);

  764.                         if(sign) level= -level;

  765.                     }

  766. 

  767.                     //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;

  768.                     if (level>0) level= level * qmul + qadd;

  769.                     else         level= level * qmul - qadd;

  770.                     i+= run + 1;

  771.                     if(last) i+=192;

  772.                 } else {

  773.                     /* second escape */

  774.                     SKIP_BITS(re, &s->gb, 2);

  775.                     GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);

  776.                     i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing

  777.                     level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

  778.                     LAST_SKIP_BITS(re, &s->gb, 1);

  779.                 }

  780.             } else {

  781.                 /* first escape */

  782.                 SKIP_BITS(re, &s->gb, 1);

  783.                 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);

  784.                 i+= run;

  785.                 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing

  786.                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

  787.                 LAST_SKIP_BITS(re, &s->gb, 1);

  788.             }

  789.         } else {

  790.             i+= run;

  791.             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

  792.             LAST_SKIP_BITS(re, &s->gb, 1);

  793.         }

  794.         if (i > 62){

  795.             i-= 192;

  796.             if(i&(~63)){

  797.                 const int left= get_bits_left(&s->gb);

  798.                 if (((i + 192 == 64 && level / qmul == -1) ||

  799.                      !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&

  800.                     left >= 0) {

  801.                     av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);

  802.                     i = 63;

  803.                     break;

  804.                 }else{

  805.                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);

  806.                     return -1;

  807.                 }

  808.             }

  809. 

  810.             block[scan_table[i]] = level;

  811.             break;

  812.         }

  813. 

  814.         block[scan_table[i]] = level;

  815.     }

  816.     CLOSE_READER(re, &s->gb);

  817.   }

  818.  not_coded:

  819.     if (s->mb_intra) {

  820.         ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);

  821.         if (s->ac_pred) {

  822.             i = 63; /* XXX: not optimal */

  823.         }

  824.     }

  825.     if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize

  826.     s->block_last_index[n] = i;

  827. 

  828.     return 0;

  829. }

  830. 

  831. void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)

  832. {

  833.     MVTable *mv;

  834.     int code, mx, my;

  835. 

  836.     mv = &ff_mv_tables[s->mv_table_index];

  837. 

  838.     code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);

  839.     if (code == MSMPEG4_MV_TABLES_NB_ELEMS) {

  840.         mx = get_bits(&s->gb, 6);

  841.         my = get_bits(&s->gb, 6);

  842.     } else {

  843.         mx = mv->table_mvx[code];

  844.         my = mv->table_mvy[code];

  845.     }

  846. 

  847.     mx += *mx_ptr - 32;

  848.     my += *my_ptr - 32;

  849.     /* WARNING : they do not do exactly modulo encoding */

  850.     if (mx <= -64)

  851.         mx += 64;

  852.     else if (mx >= 64)

  853.         mx -= 64;

  854. 

  855.     if (my <= -64)

  856.         my += 64;

  857.     else if (my >= 64)

  858.         my -= 64;

  859.     *mx_ptr = mx;

  860.     *my_ptr = my;

  861. }

  862. 

  863. AVCodec ff_msmpeg4v1_decoder = {

  864.     .name           = "msmpeg4v1",

  865.     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),

  866.     .type           = AVMEDIA_TYPE_VIDEO,

  867.     .id             = AV_CODEC_ID_MSMPEG4V1,

  868.     .priv_data_size = sizeof(MpegEncContext),

  869.     .init           = ff_msmpeg4_decode_init,

  870.     .close          = ff_h263_decode_end,

  871.     .decode         = ff_h263_decode_frame,

  872.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  873.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,

  874.     .max_lowres     = 3,

  875.     .pix_fmts       = (const enum AVPixelFormat[]) {

  876.         AV_PIX_FMT_YUV420P,

  877.         AV_PIX_FMT_NONE

  878.     },

  879. };

  880. 

  881. AVCodec ff_msmpeg4v2_decoder = {

  882.     .name           = "msmpeg4v2",

  883.     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),

  884.     .type           = AVMEDIA_TYPE_VIDEO,

  885.     .id             = AV_CODEC_ID_MSMPEG4V2,

  886.     .priv_data_size = sizeof(MpegEncContext),

  887.     .init           = ff_msmpeg4_decode_init,

  888.     .close          = ff_h263_decode_end,

  889.     .decode         = ff_h263_decode_frame,

  890.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  891.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,

  892.     .max_lowres     = 3,

  893.     .pix_fmts       = (const enum AVPixelFormat[]) {

  894.         AV_PIX_FMT_YUV420P,

  895.         AV_PIX_FMT_NONE

  896.     },

  897. };

  898. 

  899. AVCodec ff_msmpeg4v3_decoder = {

  900.     .name           = "msmpeg4",

  901.     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),

  902.     .type           = AVMEDIA_TYPE_VIDEO,

  903.     .id             = AV_CODEC_ID_MSMPEG4V3,

  904.     .priv_data_size = sizeof(MpegEncContext),

  905.     .init           = ff_msmpeg4_decode_init,

  906.     .close          = ff_h263_decode_end,

  907.     .decode         = ff_h263_decode_frame,

  908.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  909.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,

  910.     .max_lowres     = 3,

  911.     .pix_fmts       = (const enum AVPixelFormat[]) {

  912.         AV_PIX_FMT_YUV420P,

  913.         AV_PIX_FMT_NONE

  914.     },

  915. };

  916. 

  917. AVCodec ff_wmv1_decoder = {

  918.     .name           = "wmv1",

  919.     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),

  920.     .type           = AVMEDIA_TYPE_VIDEO,

  921.     .id             = AV_CODEC_ID_WMV1,

  922.     .priv_data_size = sizeof(MpegEncContext),

  923.     .init           = ff_msmpeg4_decode_init,

  924.     .close          = ff_h263_decode_end,

  925.     .decode         = ff_h263_decode_frame,

  926.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  927.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,

  928.     .max_lowres     = 3,

  929.     .pix_fmts       = (const enum AVPixelFormat[]) {

  930.         AV_PIX_FMT_YUV420P,

  931.         AV_PIX_FMT_NONE

  932.     },

  933. };