falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100802 Commits
32 Branches
2.4GB
Tree: 27eea249cc
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '27eea249cc'
${ noResults }
FFmpeg/libavcodec/msmpeg4dec.c

950 lines
32KB
Raw Blame History 

  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.         if (code < 0)

  232.             return -1;

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

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

  235. 

  236.         cbp = code & 0x3f;

  237.     } else {

  238.         s->mb_intra = 1;

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

  240.         if (code < 0)

  241.             return -1;

  242.         /* predict coded block pattern */

  243.         cbp = 0;

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

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

  246.             if (i < 4) {

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

  248.                 val = val ^ pred;

  249.                 *coded_val = val;

  250.             }

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

  252.         }

  253.     }

  254. 

  255.     if (!s->mb_intra) {

  256.         int mx, my;

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

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

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

  260.         }

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

  262.         if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)

  263.             return -1;

  264.         s->mv_dir = MV_DIR_FORWARD;

  265.         s->mv_type = MV_TYPE_16X16;

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

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

  268.         *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;

  269.     } else {

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

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

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

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

  274.         *mb_type_ptr = MB_TYPE_INTRA;

  275.         if(s->inter_intra_pred){

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

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

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

  279.         }

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

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

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

  283.         }

  284.     }

  285. 

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

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

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

  289.         {

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

  291.             return -1;

  292.         }

  293.     }

  294. 

  295.     return 0;

  296. }

  297. 

  298. /* init all vlc decoding tables */

  299. av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)

  300. {

  301.     MpegEncContext *s = avctx->priv_data;

  302.     static volatile int done = 0;

  303.     int i, ret;

  304.     MVTable *mv;

  305. 

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

  307.         return ret;

  308. 

  309.     if (ff_h263_decode_init(avctx) < 0)

  310.         return -1;

  311. 

  312.     ff_msmpeg4_common_init(s);

  313. 

  314.     if (!done) {

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

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

  317.         }

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

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

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

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

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

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

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

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

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

  327. 

  328.         mv = &ff_mv_tables[0];

  329.         INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,

  330.                     mv->table_mv_bits, 1, 1,

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

  332.         mv = &ff_mv_tables[1];

  333.         INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,

  334.                     mv->table_mv_bits, 1, 1,

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

  336. 

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

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

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

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

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

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

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

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

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

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

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

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

  349. 

  350.         INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,

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

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

  353.         INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,

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

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

  356. 

  357.         INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,

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

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

  360.         INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,

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

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

  363. 

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

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

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

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

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

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

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

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

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

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

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

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

  376. 

  377.         INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  380. 

  381.         INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,

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

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

  384.         done = 1;

  385.     }

  386. 

  387.     switch(s->msmpeg4_version){

  388.     case 1:

  389.     case 2:

  390.         s->decode_mb= msmpeg4v12_decode_mb;

  391.         break;

  392.     case 3:

  393.     case 4:

  394.         s->decode_mb= msmpeg4v34_decode_mb;

  395.         break;

  396.     case 5:

  397.         if (CONFIG_WMV2_DECODER)

  398.             s->decode_mb= ff_wmv2_decode_mb;

  399.     case 6:

  400.         //FIXME + TODO VC1 decode mb

  401.         break;

  402.     }

  403. 

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

  405. 

  406.     return 0;

  407. }

  408. 

  409. int ff_msmpeg4_decode_picture_header(MpegEncContext * s)

  410. {

  411.     int code;

  412. 

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

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

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

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

  417.     // per byte

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

  419.         return AVERROR_INVALIDDATA;

  420. 

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

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

  423.         if(start_code!=0x00000100){

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

  425.             return -1;

  426.         }

  427. 

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

  429.     }

  430. 

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

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

  433.         s->pict_type != AV_PICTURE_TYPE_P){

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

  435.         return -1;

  436.     }

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

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

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

  440.         return -1;

  441.     }

  442. 

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

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

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

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

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

  448.                 return -1;

  449.             }

  450. 

  451.             s->slice_height = code;

  452.         }else{

  453.             /* 0x17: one slice, 0x18: two slices, ... */

  454.             if (code < 0x17){

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

  456.                 return -1;

  457.             }

  458. 

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

  460.         }

  461. 

  462.         switch(s->msmpeg4_version){

  463.         case 1:

  464.         case 2:

  465.             s->rl_chroma_table_index = 2;

  466.             s->rl_table_index = 2;

  467. 

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

  469.             break;

  470.         case 3:

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

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

  473. 

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

  475.             break;

  476.         case 4:

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

  478. 

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

  480.             else                           s->per_mb_rl_table= 0;

  481. 

  482.             if(!s->per_mb_rl_table){

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

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

  485.             }

  486. 

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

  488.             s->inter_intra_pred= 0;

  489.             break;

  490.         }

  491.         s->no_rounding = 1;

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

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

  494.                 s->qscale,

  495.                 s->rl_chroma_table_index,

  496.                 s->rl_table_index,

  497.                 s->dc_table_index,

  498.                 s->per_mb_rl_table,

  499.                 s->slice_height);

  500.     } else {

  501.         switch(s->msmpeg4_version){

  502.         case 1:

  503.         case 2:

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

  505.                 s->use_skip_mb_code = 1;

  506.             else

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

  508.             s->rl_table_index = 2;

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

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

  511.             s->mv_table_index = 0;

  512.             break;

  513.         case 3:

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

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

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

  517. 

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

  519. 

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

  521.             break;

  522.         case 4:

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

  524. 

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

  526.             else                           s->per_mb_rl_table= 0;

  527. 

  528.             if(!s->per_mb_rl_table){

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

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

  531.             }

  532. 

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

  534. 

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

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

  537.             break;

  538.         }

  539. 

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

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

  542.                 s->use_skip_mb_code,

  543.                 s->rl_table_index,

  544.                 s->rl_chroma_table_index,

  545.                 s->dc_table_index,

  546.                 s->mv_table_index,

  547.                 s->per_mb_rl_table,

  548.                 s->qscale);

  549. 

  550.         if(s->flipflop_rounding){

  551.             s->no_rounding ^= 1;

  552.         }else{

  553.             s->no_rounding = 0;

  554.         }

  555.     }

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

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

  558. 

  559.     s->esc3_level_length= 0;

  560.     s->esc3_run_length= 0;

  561. 

  562.     return 0;

  563. }

  564. 

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

  566. {

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

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

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

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

  571.     {

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

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

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

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

  576.         else

  577.             s->flipflop_rounding= 0;

  578.     }

  579.     else if(left<length+8)

  580.     {

  581.         s->flipflop_rounding= 0;

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

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

  584.     }

  585.     else

  586.     {

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

  588.     }

  589. 

  590.     return 0;

  591. }

  592. 

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

  594. {

  595.     int level, pred;

  596. 

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

  598.         if (n < 4) {

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

  600.         } else {

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

  602.         }

  603.         if (level < 0) {

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

  605.             *dir_ptr = 0;

  606.             return -1;

  607.         }

  608.         level-=256;

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

  610.         if (n < 4) {

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

  612.         } else {

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

  614.         }

  615.         if (level < 0){

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

  617.             *dir_ptr = 0;

  618.             return -1;

  619.         }

  620. 

  621.         if (level == DC_MAX) {

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

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

  624.                 level = -level;

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

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

  627.                 level = -level;

  628.         }

  629.     }

  630. 

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

  632.         int32_t *dc_val;

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

  634.         level += pred;

  635. 

  636.         /* update predictor */

  637.         *dc_val= level;

  638.     }else{

  639.         int16_t *dc_val;

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

  641.         level += pred;

  642. 

  643.         /* update predictor */

  644.         if (n < 4) {

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

  646.         } else {

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

  648.         }

  649.     }

  650. 

  651.     return level;

  652. }

  653. 

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

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

  656. {

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

  658.     int av_uninit(dc_pred_dir);

  659.     RLTable *rl;

  660.     RL_VLC_ELEM *rl_vlc;

  661.     int qmul, qadd;

  662. 

  663.     if (s->mb_intra) {

  664.         qmul=1;

  665.         qadd=0;

  666. 

  667.         /* DC coef */

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

  669. 

  670.         if (level < 0){

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

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

  673.         }

  674.         if (n < 4) {

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

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

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

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

  679.             }

  680.         } else {

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

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

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

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

  685.             }

  686.         }

  687.         block[0] = level;

  688. 

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

  690.         i = 0;

  691.         if (!coded) {

  692.             goto not_coded;

  693.         }

  694.         if (s->ac_pred) {

  695.             if (dc_pred_dir == 0)

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

  697.             else

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

  699.         } else {

  700.             scan_table = s->intra_scantable.permutated;

  701.         }

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

  703.     } else {

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

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

  706.         i = -1;

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

  708. 

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

  710.             run_diff = 0;

  711.         else

  712.             run_diff = 1;

  713. 

  714.         if (!coded) {

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

  716.             return 0;

  717.         }

  718.         if(!scan_table)

  719.             scan_table = s->inter_scantable.permutated;

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

  721.     }

  722.   {

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

  724.     for(;;) {

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

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

  727.         if (level==0) {

  728.             int cache;

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

  730.             /* escape */

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

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

  733.                     /* third escape */

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

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

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

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

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

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

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

  741.                     }else{

  742.                         int sign;

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

  744.                         if(!s->esc3_level_length){

  745.                             int ll;

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

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

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

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

  750.                                 if(ll==0){

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

  752.                                 }

  753.                             }else{

  754.                                 ll=2;

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

  756.                                     ll++;

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

  758.                                 }

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

  760.                             }

  761. 

  762.                             s->esc3_level_length= ll;

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

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

  765.                         }

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

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

  768. 

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

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

  771. 

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

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

  774.                         if(sign) level= -level;

  775.                     }

  776. 

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

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

  779.                     else         level= level * qmul - qadd;

  780.                     i+= run + 1;

  781.                     if(last) i+=192;

  782.                 } else {

  783.                     /* second escape */

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

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

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

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

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

  789.                 }

  790.             } else {

  791.                 /* first escape */

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

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

  794.                 i+= run;

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

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

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

  798.             }

  799.         } else {

  800.             i+= run;

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

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

  803.         }

  804.         if (i > 62){

  805.             i-= 192;

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

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

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

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

  810.                     left >= 0) {

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

  812.                     i = 63;

  813.                     break;

  814.                 }else{

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

  816.                     return -1;

  817.                 }

  818.             }

  819. 

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

  821.             break;

  822.         }

  823. 

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

  825.     }

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

  827.   }

  828.  not_coded:

  829.     if (s->mb_intra) {

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

  831.         if (s->ac_pred) {

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

  833.         }

  834.     }

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

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

  837. 

  838.     return 0;

  839. }

  840. 

  841. int ff_msmpeg4_decode_motion(MpegEncContext * s,

  842.                                  int *mx_ptr, int *my_ptr)

  843. {

  844.     MVTable *mv;

  845.     int code, mx, my;

  846. 

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

  848. 

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

  850.     if (code < 0){

  851.         av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);

  852.         return -1;

  853.     }

  854.     if (code == mv->n) {

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

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

  857.     } else {

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

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

  860.     }

  861. 

  862.     mx += *mx_ptr - 32;

  863.     my += *my_ptr - 32;

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

  865.     if (mx <= -64)

  866.         mx += 64;

  867.     else if (mx >= 64)

  868.         mx -= 64;

  869. 

  870.     if (my <= -64)

  871.         my += 64;

  872.     else if (my >= 64)

  873.         my -= 64;

  874.     *mx_ptr = mx;

  875.     *my_ptr = my;

  876.     return 0;

  877. }

  878. 

  879. AVCodec ff_msmpeg4v1_decoder = {

  880.     .name           = "msmpeg4v1",

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

  882.     .type           = AVMEDIA_TYPE_VIDEO,

  883.     .id             = AV_CODEC_ID_MSMPEG4V1,

  884.     .priv_data_size = sizeof(MpegEncContext),

  885.     .init           = ff_msmpeg4_decode_init,

  886.     .close          = ff_h263_decode_end,

  887.     .decode         = ff_h263_decode_frame,

  888.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  889.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,

  890.     .max_lowres     = 3,

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

  892.         AV_PIX_FMT_YUV420P,

  893.         AV_PIX_FMT_NONE

  894.     },

  895. };

  896. 

  897. AVCodec ff_msmpeg4v2_decoder = {

  898.     .name           = "msmpeg4v2",

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

  900.     .type           = AVMEDIA_TYPE_VIDEO,

  901.     .id             = AV_CODEC_ID_MSMPEG4V2,

  902.     .priv_data_size = sizeof(MpegEncContext),

  903.     .init           = ff_msmpeg4_decode_init,

  904.     .close          = ff_h263_decode_end,

  905.     .decode         = ff_h263_decode_frame,

  906.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  907.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,

  908.     .max_lowres     = 3,

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

  910.         AV_PIX_FMT_YUV420P,

  911.         AV_PIX_FMT_NONE

  912.     },

  913. };

  914. 

  915. AVCodec ff_msmpeg4v3_decoder = {

  916.     .name           = "msmpeg4",

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

  918.     .type           = AVMEDIA_TYPE_VIDEO,

  919.     .id             = AV_CODEC_ID_MSMPEG4V3,

  920.     .priv_data_size = sizeof(MpegEncContext),

  921.     .init           = ff_msmpeg4_decode_init,

  922.     .close          = ff_h263_decode_end,

  923.     .decode         = ff_h263_decode_frame,

  924.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  925.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,

  926.     .max_lowres     = 3,

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

  928.         AV_PIX_FMT_YUV420P,

  929.         AV_PIX_FMT_NONE

  930.     },

  931. };

  932. 

  933. AVCodec ff_wmv1_decoder = {

  934.     .name           = "wmv1",

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

  936.     .type           = AVMEDIA_TYPE_VIDEO,

  937.     .id             = AV_CODEC_ID_WMV1,

  938.     .priv_data_size = sizeof(MpegEncContext),

  939.     .init           = ff_msmpeg4_decode_init,

  940.     .close          = ff_h263_decode_end,

  941.     .decode         = ff_h263_decode_frame,

  942.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  943.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,

  944.     .max_lowres     = 3,

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

  946.         AV_PIX_FMT_YUV420P,

  947.         AV_PIX_FMT_NONE

  948.     },

  949. };