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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 V2_MV_VLC_BITS 9

  42. #define TEX_VLC_BITS 9

  43. 

  44. #define DEFAULT_INTER_INDEX 3

  45. 

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

  47.                                     int32_t **dc_val_ptr)

  48. {

  49.     int i;

  50. 

  51.     if (n < 4) {

  52.         i= 0;

  53.     } else {

  54.         i= n-3;

  55.     }

  56. 

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

  58.     return s->last_dc[i];

  59. }

  60. 

  61. /****************************************/

  62. /* decoding stuff */

  63. 

  64. VLC ff_mb_non_intra_vlc[4];

  65. static VLC v2_dc_lum_vlc;

  66. static VLC v2_dc_chroma_vlc;

  67. static VLC v2_intra_cbpc_vlc;

  68. static VLC v2_mb_type_vlc;

  69. static VLC v2_mv_vlc;

  70. VLC ff_inter_intra_vlc;

  71. 

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

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

  74. {

  75.     int code, val, sign, shift;

  76. 

  77.     code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);

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

  79.     if (code < 0)

  80.         return 0xffff;

  81. 

  82.     if (code == 0)

  83.         return pred;

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

  85.     shift = f_code - 1;

  86.     val = code;

  87.     if (shift) {

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

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

  90.         val++;

  91.     }

  92.     if (sign)

  93.         val = -val;

  94. 

  95.     val += pred;

  96.     if (val <= -64)

  97.         val += 64;

  98.     else if (val >= 64)

  99.         val -= 64;

  100. 

  101.     return val;

  102. }

  103. 

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

  105. {

  106.     int cbp, code, i;

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

  108. 

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

  110.         if (s->use_skip_mb_code) {

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

  112.                 /* skip mb */

  113.                 s->mb_intra = 0;

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

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

  116.                 s->mv_dir = MV_DIR_FORWARD;

  117.                 s->mv_type = MV_TYPE_16X16;

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

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

  120.                 s->mb_skipped = 1;

  121.                 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;

  122.                 return 0;

  123.             }

  124.         }

  125. 

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

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

  128.         else

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

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

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

  132.             return -1;

  133.         }

  134. 

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

  136. 

  137.         cbp = code & 0x3;

  138.     } else {

  139.         s->mb_intra = 1;

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

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

  142.         else

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

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

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

  146.             return -1;

  147.         }

  148.     }

  149. 

  150.     if (!s->mb_intra) {

  151.         int mx, my, cbpy;

  152. 

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

  154.         if(cbpy<0){

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

  156.             return -1;

  157.         }

  158. 

  159.         cbp|= cbpy<<2;

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

  161. 

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

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

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

  165. 

  166.         s->mv_dir = MV_DIR_FORWARD;

  167.         s->mv_type = MV_TYPE_16X16;

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

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

  170.         *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;

  171.     } else {

  172.         int v;

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

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

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

  176.             if (v < 0) {

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

  178.                 return -1;

  179.             }

  180.             cbp|= v<<2;

  181.         } else{

  182.             s->ac_pred = 0;

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

  184.             if (v < 0) {

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

  186.                 return -1;

  187.             }

  188.             cbp|= v<<2;

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

  190.         }

  191.         *mb_type_ptr = MB_TYPE_INTRA;

  192.     }

  193. 

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

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

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

  197.         {

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

  199.              return -1;

  200.         }

  201.     }

  202.     return 0;

  203. }

  204. 

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

  206. {

  207.     int cbp, code, i;

  208.     uint8_t *coded_val;

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

  210. 

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

  212.         return AVERROR_INVALIDDATA;

  213. 

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

  215.         if (s->use_skip_mb_code) {

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

  217.                 /* skip mb */

  218.                 s->mb_intra = 0;

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

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

  221.                 s->mv_dir = MV_DIR_FORWARD;

  222.                 s->mv_type = MV_TYPE_16X16;

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

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

  225.                 s->mb_skipped = 1;

  226.                 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;

  227. 

  228.                 return 0;

  229.             }

  230.         }

  231. 

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

  233.         if (code < 0)

  234.             return -1;

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

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

  237. 

  238.         cbp = code & 0x3f;

  239.     } else {

  240.         s->mb_intra = 1;

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

  242.         if (code < 0)

  243.             return -1;

  244.         /* predict coded block pattern */

  245.         cbp = 0;

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

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

  248.             if (i < 4) {

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

  250.                 val = val ^ pred;

  251.                 *coded_val = val;

  252.             }

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

  254.         }

  255.     }

  256. 

  257.     if (!s->mb_intra) {

  258.         int mx, my;

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

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

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

  262.         }

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

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

  265.             return -1;

  266.         s->mv_dir = MV_DIR_FORWARD;

  267.         s->mv_type = MV_TYPE_16X16;

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

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

  270.         *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;

  271.     } else {

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

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

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

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

  276.         *mb_type_ptr = MB_TYPE_INTRA;

  277.         if(s->inter_intra_pred){

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

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

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

  281.         }

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

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

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

  285.         }

  286.     }

  287. 

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

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

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

  291.         {

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

  293.             return -1;

  294.         }

  295.     }

  296. 

  297.     return 0;

  298. }

  299. 

  300. /* init all vlc decoding tables */

  301. av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)

  302. {

  303.     MpegEncContext *s = avctx->priv_data;

  304.     static volatile int done = 0;

  305.     int i, ret;

  306.     MVTable *mv;

  307. 

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

  309.         return ret;

  310. 

  311.     if (ff_h263_decode_init(avctx) < 0)

  312.         return -1;

  313. 

  314.     ff_msmpeg4_common_init(s);

  315. 

  316.     if (!done) {

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

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

  319.         }

  320.         INIT_VLC_RL(ff_rl_table[0], 642);

  321.         INIT_VLC_RL(ff_rl_table[1], 1104);

  322.         INIT_VLC_RL(ff_rl_table[2], 554);

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

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

  325.         INIT_VLC_RL(ff_rl_table[5], 554);

  326. 

  327.         mv = &ff_mv_tables[0];

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

  329.                     mv->table_mv_bits, 1, 1,

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

  331.         mv = &ff_mv_tables[1];

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

  333.                     mv->table_mv_bits, 1, 1,

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

  335. 

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

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

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

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

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

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

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

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

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

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

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

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

  348. 

  349.         INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,

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

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

  352.         INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,

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

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

  355. 

  356.         INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,

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

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

  359.         INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,

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

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

  362.         INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,

  363.                  &ff_mvtab[0][1], 2, 1,

  364.                  &ff_mvtab[0][0], 2, 1, 538);

  365. 

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

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

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

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

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

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

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

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

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

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

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

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

  378. 

  379.         INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,

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

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

  382. 

  383.         INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,

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

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

  386.         done = 1;

  387.     }

  388. 

  389.     switch(s->msmpeg4_version){

  390.     case 1:

  391.     case 2:

  392.         s->decode_mb= msmpeg4v12_decode_mb;

  393.         break;

  394.     case 3:

  395.     case 4:

  396.         s->decode_mb= msmpeg4v34_decode_mb;

  397.         break;

  398.     case 5:

  399.         if (CONFIG_WMV2_DECODER)

  400.             s->decode_mb= ff_wmv2_decode_mb;

  401.     case 6:

  402.         //FIXME + TODO VC1 decode mb

  403.         break;

  404.     }

  405. 

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

  407. 

  408.     return 0;

  409. }

  410. 

  411. int ff_msmpeg4_decode_picture_header(MpegEncContext * s)

  412. {

  413.     int code;

  414. 

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

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

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

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

  419.     // per byte

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

  421.         return AVERROR_INVALIDDATA;

  422. 

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

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

  425.         if(start_code!=0x00000100){

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

  427.             return -1;

  428.         }

  429. 

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

  431.     }

  432. 

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

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

  435.         s->pict_type != AV_PICTURE_TYPE_P){

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

  437.         return -1;

  438.     }

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

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

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

  442.         return -1;

  443.     }

  444. 

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

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

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

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

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

  450.                 return -1;

  451.             }

  452. 

  453.             s->slice_height = code;

  454.         }else{

  455.             /* 0x17: one slice, 0x18: two slices, ... */

  456.             if (code < 0x17){

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

  458.                 return -1;

  459.             }

  460. 

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

  462.         }

  463. 

  464.         switch(s->msmpeg4_version){

  465.         case 1:

  466.         case 2:

  467.             s->rl_chroma_table_index = 2;

  468.             s->rl_table_index = 2;

  469. 

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

  471.             break;

  472.         case 3:

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

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

  475. 

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

  477.             break;

  478.         case 4:

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

  480. 

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

  482.             else                           s->per_mb_rl_table= 0;

  483. 

  484.             if(!s->per_mb_rl_table){

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

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

  487.             }

  488. 

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

  490.             s->inter_intra_pred= 0;

  491.             break;

  492.         }

  493.         s->no_rounding = 1;

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

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

  496.                 s->qscale,

  497.                 s->rl_chroma_table_index,

  498.                 s->rl_table_index,

  499.                 s->dc_table_index,

  500.                 s->per_mb_rl_table,

  501.                 s->slice_height);

  502.     } else {

  503.         switch(s->msmpeg4_version){

  504.         case 1:

  505.         case 2:

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

  507.                 s->use_skip_mb_code = 1;

  508.             else

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

  510.             s->rl_table_index = 2;

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

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

  513.             s->mv_table_index = 0;

  514.             break;

  515.         case 3:

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

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

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

  519. 

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

  521. 

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

  523.             break;

  524.         case 4:

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

  526. 

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

  528.             else                           s->per_mb_rl_table= 0;

  529. 

  530.             if(!s->per_mb_rl_table){

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

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

  533.             }

  534. 

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

  536. 

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

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

  539.             break;

  540.         }

  541. 

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

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

  544.                 s->use_skip_mb_code,

  545.                 s->rl_table_index,

  546.                 s->rl_chroma_table_index,

  547.                 s->dc_table_index,

  548.                 s->mv_table_index,

  549.                 s->per_mb_rl_table,

  550.                 s->qscale);

  551. 

  552.         if(s->flipflop_rounding){

  553.             s->no_rounding ^= 1;

  554.         }else{

  555.             s->no_rounding = 0;

  556.         }

  557.     }

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

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

  560. 

  561.     s->esc3_level_length= 0;

  562.     s->esc3_run_length= 0;

  563. 

  564.     return 0;

  565. }

  566. 

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

  568. {

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

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

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

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

  573.     {

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

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

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

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

  578.         else

  579.             s->flipflop_rounding= 0;

  580.     }

  581.     else if(left<length+8)

  582.     {

  583.         s->flipflop_rounding= 0;

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

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

  586.     }

  587.     else

  588.     {

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

  590.     }

  591. 

  592.     return 0;

  593. }

  594. 

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

  596. {

  597.     int level, pred;

  598. 

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

  600.         if (n < 4) {

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

  602.         } else {

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

  604.         }

  605.         if (level < 0) {

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

  607.             *dir_ptr = 0;

  608.             return -1;

  609.         }

  610.         level-=256;

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

  612.         if (n < 4) {

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

  614.         } else {

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

  616.         }

  617.         if (level < 0){

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

  619.             *dir_ptr = 0;

  620.             return -1;

  621.         }

  622. 

  623.         if (level == DC_MAX) {

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

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

  626.                 level = -level;

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

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

  629.                 level = -level;

  630.         }

  631.     }

  632. 

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

  634.         int32_t *dc_val;

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

  636.         level += pred;

  637. 

  638.         /* update predictor */

  639.         *dc_val= level;

  640.     }else{

  641.         int16_t *dc_val;

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

  643.         level += pred;

  644. 

  645.         /* update predictor */

  646.         if (n < 4) {

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

  648.         } else {

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

  650.         }

  651.     }

  652. 

  653.     return level;

  654. }

  655. 

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

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

  658. {

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

  660.     int av_uninit(dc_pred_dir);

  661.     RLTable *rl;

  662.     RL_VLC_ELEM *rl_vlc;

  663.     int qmul, qadd;

  664. 

  665.     if (s->mb_intra) {

  666.         qmul=1;

  667.         qadd=0;

  668. 

  669.         /* DC coef */

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

  671. 

  672.         if (level < 0){

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

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

  675.         }

  676.         if (n < 4) {

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

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

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

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

  681.             }

  682.         } else {

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

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

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

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

  687.             }

  688.         }

  689.         block[0] = level;

  690. 

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

  692.         i = 0;

  693.         if (!coded) {

  694.             goto not_coded;

  695.         }

  696.         if (s->ac_pred) {

  697.             if (dc_pred_dir == 0)

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

  699.             else

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

  701.         } else {

  702.             scan_table = s->intra_scantable.permutated;

  703.         }

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

  705.     } else {

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

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

  708.         i = -1;

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

  710. 

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

  712.             run_diff = 0;

  713.         else

  714.             run_diff = 1;

  715. 

  716.         if (!coded) {

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

  718.             return 0;

  719.         }

  720.         if(!scan_table)

  721.             scan_table = s->inter_scantable.permutated;

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

  723.     }

  724.   {

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

  726.     for(;;) {

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

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

  729.         if (level==0) {

  730.             int cache;

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

  732.             /* escape */

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

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

  735.                     /* third escape */

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

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

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

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

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

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

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

  743.                     }else{

  744.                         int sign;

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

  746.                         if(!s->esc3_level_length){

  747.                             int ll;

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

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

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

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

  752.                                 if(ll==0){

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

  754.                                 }

  755.                             }else{

  756.                                 ll=2;

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

  758.                                     ll++;

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

  760.                                 }

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

  762.                             }

  763. 

  764.                             s->esc3_level_length= ll;

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

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

  767.                         }

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

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

  770. 

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

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

  773. 

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

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

  776.                         if(sign) level= -level;

  777.                     }

  778. 

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

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

  781.                     else         level= level * qmul - qadd;

  782.                     i+= run + 1;

  783.                     if(last) i+=192;

  784.                 } else {

  785.                     /* second escape */

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

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

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

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

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

  791.                 }

  792.             } else {

  793.                 /* first escape */

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

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

  796.                 i+= run;

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

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

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

  800.             }

  801.         } else {

  802.             i+= run;

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

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

  805.         }

  806.         if (i > 62){

  807.             i-= 192;

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

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

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

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

  812.                     left >= 0) {

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

  814.                     i = 63;

  815.                     break;

  816.                 }else{

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

  818.                     return -1;

  819.                 }

  820.             }

  821. 

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

  823.             break;

  824.         }

  825. 

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

  827.     }

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

  829.   }

  830.  not_coded:

  831.     if (s->mb_intra) {

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

  833.         if (s->ac_pred) {

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

  835.         }

  836.     }

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

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

  839. 

  840.     return 0;

  841. }

  842. 

  843. int ff_msmpeg4_decode_motion(MpegEncContext * s,

  844.                                  int *mx_ptr, int *my_ptr)

  845. {

  846.     MVTable *mv;

  847.     int code, mx, my;

  848. 

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

  850. 

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

  852.     if (code < 0){

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

  854.         return -1;

  855.     }

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

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

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

  859.     } else {

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

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

  862.     }

  863. 

  864.     mx += *mx_ptr - 32;

  865.     my += *my_ptr - 32;

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

  867.     if (mx <= -64)

  868.         mx += 64;

  869.     else if (mx >= 64)

  870.         mx -= 64;

  871. 

  872.     if (my <= -64)

  873.         my += 64;

  874.     else if (my >= 64)

  875.         my -= 64;

  876.     *mx_ptr = mx;

  877.     *my_ptr = my;

  878.     return 0;

  879. }

  880. 

  881. AVCodec ff_msmpeg4v1_decoder = {

  882.     .name           = "msmpeg4v1",

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

  884.     .type           = AVMEDIA_TYPE_VIDEO,

  885.     .id             = AV_CODEC_ID_MSMPEG4V1,

  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_msmpeg4v2_decoder = {

  900.     .name           = "msmpeg4v2",

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

  902.     .type           = AVMEDIA_TYPE_VIDEO,

  903.     .id             = AV_CODEC_ID_MSMPEG4V2,

  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_msmpeg4v3_decoder = {

  918.     .name           = "msmpeg4",

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

  920.     .type           = AVMEDIA_TYPE_VIDEO,

  921.     .id             = AV_CODEC_ID_MSMPEG4V3,

  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. };

  934. 

  935. AVCodec ff_wmv1_decoder = {

  936.     .name           = "wmv1",

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

  938.     .type           = AVMEDIA_TYPE_VIDEO,

  939.     .id             = AV_CODEC_ID_WMV1,

  940.     .priv_data_size = sizeof(MpegEncContext),

  941.     .init           = ff_msmpeg4_decode_init,

  942.     .close          = ff_h263_decode_end,

  943.     .decode         = ff_h263_decode_frame,

  944.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,

  945.     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,

  946.     .max_lowres     = 3,

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

  948.         AV_PIX_FMT_YUV420P,

  949.         AV_PIX_FMT_NONE

  950.     },

  951. };