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FFmpeg/libavcodec/cavsdec.c

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  1. /*

  2.  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.

  3.  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder

  25.  * @author Stefan Gehrer <stefan.gehrer@gmx.de>

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "golomb.h"

  31. #include "cavs.h"

  32. #include "internal.h"

  33. #include "mpeg12data.h"

  34. #include "mpegvideo.h"

  35. 

  36. static const uint8_t mv_scan[4] = {

  37.     MV_FWD_X0, MV_FWD_X1,

  38.     MV_FWD_X2, MV_FWD_X3

  39. };

  40. 

  41. static const uint8_t cbp_tab[64][2] = {

  42.   { 63,  0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, {  0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },

  43.   {  7, 14 }, {  5, 11 }, { 10, 12 }, {  8,  5 }, { 12, 10 }, { 61,  7 }, {  4, 48 }, { 55,  3 },

  44.   {  1,  2 }, {  2,  8 }, { 59,  4 }, {  3,  1 }, { 62, 61 }, {  9, 55 }, {  6, 59 }, { 29, 62 },

  45.   { 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53,  9 }, { 30,  6 },

  46.   { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },

  47.   { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },

  48.   { 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },

  49.   { 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }

  50. };

  51. 

  52. static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };

  53. 

  54. static const uint8_t cavs_chroma_qp[64] = {

  55.    0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  56.   16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,

  57.   32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,

  58.   45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51

  59. };

  60. 

  61. static const uint8_t dequant_shift[64] = {

  62.   14, 14, 14, 14, 14, 14, 14, 14,

  63.   13, 13, 13, 13, 13, 13, 13, 13,

  64.   13, 12, 12, 12, 12, 12, 12, 12,

  65.   11, 11, 11, 11, 11, 11, 11, 11,

  66.   11, 10, 10, 10, 10, 10, 10, 10,

  67.   10,  9,  9,  9,  9,  9,  9,  9,

  68.   9,   8,  8,  8,  8,  8,  8,  8,

  69.   7,   7,  7,  7,  7,  7,  7,  7

  70. };

  71. 

  72. static const uint16_t dequant_mul[64] = {

  73.   32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,

  74.   32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,

  75.   65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,

  76.   32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,

  77.   65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,

  78.   65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,

  79.   65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,

  80.   32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099

  81. };

  82. 

  83. #define EOB 0, 0, 0

  84. 

  85. static const struct dec_2dvlc intra_dec[7] = {

  86.     {

  87.         { //level / run / table_inc

  88.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3, 1 },

  89.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6, 1 },

  90.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9, 1 },

  91.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  2,  1,  2 }, { -2,  1, 2 },

  92.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14, 1 },

  93.             {  1, 15,  1 }, { -1, 15,  1 }, {  2,  2,  2 }, { -2,  2,  2 }, {  1, 16,  1 }, { -1, 16, 1 },

  94.             {  1, 17,  1 }, { -1, 17,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 18,  1 }, { -1, 18, 1 },

  95.             {  1, 19,  1 }, { -1, 19,  1 }, {  2,  3,  2 }, { -2,  3,  2 }, {  1, 20,  1 }, { -1, 20, 1 },

  96.             {  1, 21,  1 }, { -1, 21,  1 }, {  2,  4,  2 }, { -2,  4,  2 }, {  1, 22,  1 }, { -1, 22, 1 },

  97.             {  2,  5,  2 }, { -2,  5,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {   EOB    }

  98.         },

  99.         //level_add

  100.         { 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1 },

  101.         2, //golomb_order

  102.         0, //inc_limit

  103.         23, //max_run

  104.     },

  105.     {

  106.         { //level / run

  107.             {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 }, { -2,  1,  1 },

  108.             {  1,  3,  0 }, { -1,  3,  0 }, {     EOB    }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  109.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  2,  2,  1 },

  110.             { -2,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  1,  9,  0 },

  111.             { -1,  9,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  4,  1,  2 }, { -4,  1,  2 }, {  1, 10,  0 },

  112.             { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  3,  2,  2 },

  113.             { -3,  2,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  5,  1,  3 },

  114.             { -5,  1,  3 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 14,  0 },

  115.             { -1, 14,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  2,  8,  1 }, { -2,  8,  1 }, {  3,  3,  2 },

  116.             { -3,  3,  2 }, {  6,  1,  3 }, { -6,  1,  3 }, {  1, 15,  0 }, { -1, 15,  0 }

  117.         },

  118.         //level_add

  119.         { 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  120.         2, //golomb_order

  121.         1, //inc_limit

  122.         15, //max_run

  123.     },

  124.     {

  125.         { //level / run

  126.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 },

  127.             {  3,  1,  1 }, { -3,  1,  1 }, {     EOB    }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  128.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  129.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  130.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  2,  4,  0 },

  131.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  132.             { -7,  1,  2 }, {  3,  3,  1 }, { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 },

  133.             { -1,  8,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  3 }, { -8,  1,  3 }, {  1,  9,  0 },

  134.             { -1,  9,  0 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 }, {  2,  7,  0 },

  135.             { -2,  7,  0 }, {  9,  1,  3 }, { -9,  1,  3 }, {  1, 10,  0 }, { -1, 10,  0 }

  136.         },

  137.         //level_add

  138.         { 0, 10, 6, 4, 4, 3, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  139.         2, //golomb_order

  140.         2, //inc_limit

  141.         10, //max_run

  142.     },

  143.     {

  144.         { //level / run

  145.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

  146.             {  1,  2,  0 }, { -1,  2,  0 }, {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  1 },

  147.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  1 },

  148.             { -6,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  149.             { -1,  4,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  150.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  5,  2,  1 },

  151.             { -5,  2,  1 }, {  2,  4,  0 }, { -2,  4,  0 }, { 10,  1,  2 }, {-10,  1,  2 }, {  3,  3,  0 },

  152.             { -3,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 11,  1,  3 }, {-11,  1,  3 }, {  6,  2,  1 },

  153.             { -6,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  5,  0 }, { -2,  5,  0 }, {  3,  4,  0 },

  154.             { -3,  4,  0 }, { 12,  1,  3 }, {-12,  1,  3 }, {  4,  3,  0 }, { -4,  3,  0 }

  155.          },

  156.         //level_add

  157.         { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  158.         2, //golomb_order

  159.         4, //inc_limit

  160.         7, //max_run

  161.     },

  162.     {

  163.         { //level / run

  164.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

  165.             {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  166.             { -6,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  1 },

  167.             { -8,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, { 10,  1,  1 },

  168.             {-10,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 11,  1,  2 },

  169.             {-11,  1,  2 }, {  4,  2,  0 }, { -4,  2,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, { 13,  1,  2 },

  170.             {-13,  1,  2 }, {  5,  2,  0 }, { -5,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 },

  171.             { -2,  3,  0 }, { 14,  1,  2 }, {-14,  1,  2 }, {  6,  2,  0 }, { -6,  2,  0 }, { 15,  1,  2 },

  172.             {-15,  1,  2 }, { 16,  1,  2 }, {-16,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  5,  0 },

  173.             { -1,  5,  0 }, {  7,  2,  0 }, { -7,  2,  0 }, { 17,  1,  2 }, {-17,  1,  2 }

  174.         },

  175.         //level_add

  176.         { 0,18, 8, 4, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  177.         2, //golomb_order

  178.         7, //inc_limit

  179.         5, //max_run

  180.     },

  181.     {

  182.         { //level / run

  183.             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  184.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  185.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  186.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 11,  1,  1 },

  187.             {-11,  1,  1 }, { 12,  1,  1 }, {-12,  1,  1 }, { 13,  1,  1 }, {-13,  1,  1 }, {  2,  2,  0 },

  188.             { -2,  2,  0 }, { 14,  1,  1 }, {-14,  1,  1 }, { 15,  1,  1 }, {-15,  1,  1 }, {  3,  2,  0 },

  189.             { -3,  2,  0 }, { 16,  1,  1 }, {-16,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, { 17,  1,  1 },

  190.             {-17,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, { 18,  1,  1 }, {-18,  1,  1 }, {  5,  2,  0 },

  191.             { -5,  2,  0 }, { 19,  1,  1 }, {-19,  1,  1 }, { 20,  1,  1 }, {-20,  1,  1 }, {  6,  2,  0 },

  192.             { -6,  2,  0 }, { 21,  1,  1 }, {-21,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }

  193.         },

  194.         //level_add

  195.         { 0, 22, 7, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  196.         2, //golomb_order

  197.         10, //inc_limit

  198.         3, //max_run

  199.     },

  200.     {

  201.         { //level / run

  202.             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  203.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  204.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  205.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, { 11,  1,  0 }, {-11,  1,  0 }, { 12,  1,  0 },

  206.             {-12,  1,  0 }, { 13,  1,  0 }, {-13,  1,  0 }, { 14,  1,  0 }, {-14,  1,  0 }, { 15,  1,  0 },

  207.             {-15,  1,  0 }, { 16,  1,  0 }, {-16,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 17,  1,  0 },

  208.             {-17,  1,  0 }, { 18,  1,  0 }, {-18,  1,  0 }, { 19,  1,  0 }, {-19,  1,  0 }, { 20,  1,  0 },

  209.             {-20,  1,  0 }, { 21,  1,  0 }, {-21,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, { 22,  1,  0 },

  210.             {-22,  1,  0 }, { 23,  1,  0 }, {-23,  1,  0 }, { 24,  1,  0 }, {-24,  1,  0 }, { 25,  1,  0 },

  211.             {-25,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 26,  1,  0 }, {-26,  1,  0 }

  212.         },

  213.         //level_add

  214.         { 0, 27, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  215.         2, //golomb_order

  216.         INT_MAX, //inc_limit

  217.         2, //max_run

  218.     }

  219. };

  220. 

  221. static const struct dec_2dvlc inter_dec[7] = {

  222.     {

  223.         { //level / run

  224.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  225.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  226.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9,  1 },

  227.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  1, 12,  1 }, { -1, 12,  1 },

  228.             {  1, 13,  1 }, { -1, 13,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1, 14,  1 }, { -1, 14,  1 },

  229.             {  1, 15,  1 }, { -1, 15,  1 }, {  1, 16,  1 }, { -1, 16,  1 }, {  1, 17,  1 }, { -1, 17,  1 },

  230.             {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 }, {  3,  1,  3 }, { -3,  1,  3 },

  231.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  2,  2,  2 }, { -2,  2,  2 },

  232.             {  1, 22,  1 }, { -1, 22,  1 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  233.             {  1, 25,  1 }, { -1, 25,  1 }, {  1, 26,  1 }, { -1, 26,  1 }, {   EOB    }

  234.         },

  235.         //level_add

  236.         { 0, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 },

  237.         3, //golomb_order

  238.         0, //inc_limit

  239.         26 //max_run

  240.     },

  241.     {

  242.         { //level / run

  243.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  1,  3,  0 },

  244.             { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  245.             { -1,  6,  0 }, {  2,  1,  1 }, { -2,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 },

  246.             { -1,  8,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  2,  2,  1 },

  247.             { -2,  2,  1 }, {  1, 11,  0 }, { -1, 11,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  1,  2 },

  248.             { -3,  1,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 }, { -1, 14,  0 }, {  2,  3,  1 },

  249.             { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  1, 16,  0 },

  250.             { -1, 16,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  1, 17,  0 }, { -1, 17,  0 }, {  4,  1,  3 },

  251.             { -4,  1,  3 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 18,  0 }, { -1, 18,  0 }, {  1, 19,  0 },

  252.             { -1, 19,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  3,  2,  2 }, { -3,  2,  2 }

  253.         },

  254.         //level_add

  255.         { 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1 },

  256.         2, //golomb_order

  257.         1, //inc_limit

  258.         19 //max_run

  259.     },

  260.     {

  261.         { //level / run

  262.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  0 },

  263.             { -2,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  3,  1,  1 },

  264.             { -3,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  265.             { -1,  6,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  1,  2 },

  266.             { -4,  1,  2 }, {  1,  8,  0 }, { -1,  8,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  4,  0 },

  267.             { -2,  4,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  5,  1,  2 },

  268.             { -5,  1,  2 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  6,  0 },

  269.             { -2,  6,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  3,  1 }, { -3,  3,  1 }, {  6,  1,  2 },

  270.             { -6,  1,  2 }, {  4,  2,  2 }, { -4,  2,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  7,  0 },

  271.             { -2,  7,  0 }, {  3,  4,  1 }, { -3,  4,  1 }, {  1, 14,  0 }, { -1, 14,  0 }

  272.         },

  273.         //level_add

  274.         { 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  275.         2, //golomb_order

  276.         2, //inc_limit

  277.         14 //max_run

  278.     },

  279.     {

  280.         { //level / run

  281.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },

  282.             { -1,  2,  0 }, {  3,  1,  0 }, { -3,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  283.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  1 },

  284.             { -5,  1,  1 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  2,  3,  0 },

  285.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  2,  4,  0 },

  286.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  287.             { -7,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  5,  0 },

  288.             { -2,  5,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  4,  0 },

  289.             { -3,  4,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  1, 10,  0 },

  290.             { -1, 10,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  4,  3,  1 }, { -4,  3,  1 }

  291.         },

  292.         //level_add

  293.         { 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  294.         2, //golomb_order

  295.         3, //inc_limit

  296.         10 //max_run

  297.     },

  298.     {

  299.         { //level / run

  300.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  301.             { -3,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 },

  302.             { -5,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  0 },

  303.             { -6,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  304.             { -1,  4,  0 }, {  8,  1,  1 }, { -8,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  305.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, {  5,  2,  0 },

  306.             { -5,  2,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 10,  1,  2 },

  307.             {-10,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, { 11,  1,  2 }, {-11,  1,  2 }, {  1,  7,  0 },

  308.             { -1,  7,  0 }, {  6,  2,  0 }, { -6,  2,  0 }, {  3,  4,  0 }, { -3,  4,  0 }, {  2,  5,  0 },

  309.             { -2,  5,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, {  4,  3,  0 }, { -4,  3,  0 }

  310.         },

  311.         //level_add

  312.         { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  313.         2, //golomb_order

  314.         6, //inc_limit

  315.         7  //max_run

  316.     },

  317.     {

  318.         { //level / run

  319.             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {  3,  1,  0 },

  320.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  1,  2,  0 },

  321.             {  -1,  2,  0 }, {  6,  1,  0 }, {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 },

  322.             {  -8,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, {  1,  3,  0 },

  323.             {  -1,  3,  0 }, { 10,  1,  1 }, { -10,  1,  1 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 11,  1,  1 },

  324.             { -11,  1,  1 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 12,  1,  1 }, { -12,  1,  1 }, {  1,  4,  0 },

  325.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 13,  1,  1 }, { -13,  1,  1 }, {  5,  2,  0 },

  326.             {  -5,  2,  0 }, { 14,  1,  1 }, { -14,  1,  1 }, {  6,  2,  0 }, {  -6,  2,  0 }, {  1,  5,  0 },

  327.             {  -1,  5,  0 }, { 15,  1,  1 }, { -15,  1,  1 }, {  3,  3,  0 }, {  -3,  3,  0 }, { 16,  1,  1 },

  328.             { -16,  1,  1 }, {  2,  4,  0 }, {  -2,  4,  0 }, {  7,  2,  0 }, {  -7,  2,  0 }

  329.         },

  330.         //level_add

  331.         { 0, 17, 8, 4, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  332.         2, //golomb_order

  333.         9, //inc_limit

  334.         5  //max_run

  335.     },

  336.     {

  337.         { //level / run

  338.             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {   3,  1,  0 },

  339.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {   6,  1,  0 },

  340.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  1,  2,  0 }, {  -1,  2,  0 }, {   8,  1,  0 },

  341.             {  -8,  1,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, {  11,  1,  0 },

  342.             { -11,  1,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  13,  1,  0 },

  343.             { -13,  1,  0 }, {  1,  3,  0 }, {  -1,  3,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  15,  1,  0 },

  344.             { -15,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 16,  1,  0 }, { -16,  1,  0 }, {  17,  1,  0 },

  345.             { -17,  1,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, {  19,  1,  0 },

  346.             { -19,  1,  0 }, { 20,  1,  0 }, { -20,  1,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, {   1,  4,  0 },

  347.             {  -1,  4,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, { 21,  1,  0 }, { -21,  1,  0 }

  348.         },

  349.         //level_add

  350.         { 0, 22, 6, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  351.         2, //golomb_order

  352.         INT_MAX, //inc_limit

  353.         4 //max_run

  354.     }

  355. };

  356. 

  357. static const struct dec_2dvlc chroma_dec[5] = {

  358.     {

  359.         { //level / run

  360.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  361.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  362.             {  1,  7,  1 }, { -1,  7,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1,  8,  1 }, { -1,  8,  1 },

  363.             {  1,  9,  1 }, { -1,  9,  1 }, {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 },

  364.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14,  1 },

  365.             {  1, 15,  1 }, { -1, 15,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 16,  1 }, { -1, 16,  1 },

  366.             {  1, 17,  1 }, { -1, 17,  1 }, {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 },

  367.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  1, 22,  1 }, { -1, 22,  1 },

  368.             {  2,  2,  2 }, { -2,  2,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  369.             {  1, 25,  1 }, { -1, 25,  1 }, {  4,  1,  3 }, { -4,  1,  3 }, {   EOB    }

  370.         },

  371.         //level_add

  372.         { 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1 },

  373.         2, //golomb_order

  374.         0, //inc_limit

  375.         25 //max_run

  376.     },

  377.     {

  378.         { //level / run

  379.             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 },

  380.             { -2,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  381.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  1,  7,  0 },

  382.             { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  2,  1 }, { -2,  2,  1 }, {  1,  9,  0 },

  383.             { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  4,  1,  2 },

  384.             { -4,  1,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 },

  385.             { -1, 14,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 },

  386.             { -2,  4,  1 }, {  5,  1,  3 }, { -5,  1,  3 }, {  3,  2,  2 }, { -3,  2,  2 }, {  1, 16,  0 },

  387.             { -1, 16,  0 }, {  1, 17,  0 }, { -1, 17,  0 }, {  1, 18,  0 }, { -1, 18,  0 }, {  2,  5,  1 },

  388.             { -2,  5,  1 }, {  1, 19,  0 }, { -1, 19,  0 }, {  1, 20,  0 }, { -1, 20,  0 }

  389.         },

  390.         //level_add

  391.         { 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1 },

  392.         0, //golomb_order

  393.         1, //inc_limit

  394.         20 //max_run

  395.     },

  396.     {

  397.         { //level / run

  398.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },

  399.             { -1,  2,  0 }, {  3,  1,  1 }, { -3,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  4,  1,  1 },

  400.             { -4,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  401.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  402.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  1,  7,  0 },

  403.             { -1,  7,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  7,  1,  2 }, { -7,  1,  2 }, {  1,  8,  0 },

  404.             { -1,  8,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  3,  1 },

  405.             { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  2 },

  406.             { -8,  1,  2 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  9,  1,  2 },

  407.             { -9,  1,  2 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 },

  408.         },

  409.         //level_add

  410.         { 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  411.         1, //golomb_order

  412.         2, //inc_limit

  413.         11 //max_run

  414.     },

  415.     {

  416.         { //level / run

  417.             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  418.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  5,  1,  1 },

  419.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  1,  3,  0 },

  420.             { -1,  3,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  8,  1,  1 },

  421.             { -8,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  9,  1,  1 },

  422.             { -9,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, { 10,  1,  1 },

  423.             {-10,  1,  1 }, {  3,  3,  0 }, { -3,  3,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  2,  4,  0 },

  424.             { -2,  4,  0 }, { 11,  1,  1 }, {-11,  1,  1 }, {  1,  6,  0 }, { -1,  6,  0 }, { 12,  1,  1 },

  425.             {-12,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  6,  2,  1 }, { -6,  2,  1 }, { 13,  1,  1 },

  426.             {-13,  1,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 }, { -1,  8,  0 },

  427.         },

  428.         //level_add

  429.         { 0, 14, 7, 4, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  430.         1, //golomb_order

  431.         4, //inc_limit

  432.         8  //max_run

  433.     },

  434.     {

  435.         { //level / run

  436.             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {  3,  1,  0 },

  437.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  6,  1,  0 },

  438.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 }, {  -8,  1,  0 }, {  1,  2,  0 },

  439.             {  -1,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, { 11,  1,  0 },

  440.             { -11,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, { 13,  1,  0 },

  441.             { -13,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  1,  3,  0 },

  442.             {  -1,  3,  0 }, { 15,  1,  0 }, { -15,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 16,  1,  0 },

  443.             { -16,  1,  0 }, { 17,  1,  0 }, { -17,  1,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, {  1,  4,  0 },

  444.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  6,  2,  0 },

  445.             {  -6,  2,  0 }, { 19,  1,  0 }, { -19,  1,  0 }, {  1,  5,  0 }, {  -1,  5,  0 },

  446.         },

  447.         //level_add

  448.         { 0, 20, 7, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },

  449.         0, //golomb_order

  450.         INT_MAX, //inc_limit

  451.         5, //max_run

  452.     }

  453. };

  454. 

  455. #undef EOB

  456. 

  457. /*****************************************************************************

  458.  *

  459.  * motion vector prediction

  460.  *

  461.  ****************************************************************************/

  462. 

  463. static inline void store_mvs(AVSContext *h)

  464. {

  465.     h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];

  466.     h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];

  467.     h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];

  468.     h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];

  469. }

  470. 

  471. static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,

  472.                                   cavs_vector *col_mv)

  473. {

  474.     cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;

  475.     int den = h->direct_den[col_mv->ref];

  476.     int m = col_mv->x >> 31;

  477. 

  478.     pmv_fw->dist = h->dist[1];

  479.     pmv_bw->dist = h->dist[0];

  480.     pmv_fw->ref = 1;

  481.     pmv_bw->ref = 0;

  482.     /* scale the co-located motion vector according to its temporal span */

  483.     pmv_fw->x =     (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;

  484.     pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);

  485.     m = col_mv->y >> 31;

  486.     pmv_fw->y =     (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;

  487.     pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);

  488. }

  489. 

  490. static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,

  491.                                enum cavs_block size)

  492. {

  493.     cavs_vector *dst = src + MV_BWD_OFFS;

  494. 

  495.     /* backward mv is the scaled and negated forward mv */

  496.     dst->x = -((src->x * h->sym_factor + 256) >> 9);

  497.     dst->y = -((src->y * h->sym_factor + 256) >> 9);

  498.     dst->ref = 0;

  499.     dst->dist = h->dist[0];

  500.     set_mvs(dst, size);

  501. }

  502. 

  503. /*****************************************************************************

  504.  *

  505.  * residual data decoding

  506.  *

  507.  ****************************************************************************/

  508. 

  509. /** kth-order exponential golomb code */

  510. static inline int get_ue_code(GetBitContext *gb, int order)

  511. {

  512.     if (order) {

  513.         int ret = get_ue_golomb(gb) << order;

  514.         return ret + get_bits(gb, order);

  515.     }

  516.     return get_ue_golomb(gb);

  517. }

  518. 

  519. static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,

  520.                           int16_t *dst, int mul, int shift, int coeff_num)

  521. {

  522.     int round = 1 << (shift - 1);

  523.     int pos = -1;

  524.     const uint8_t *scantab = h->scantable.permutated;

  525. 

  526.     /* inverse scan and dequantization */

  527.     while (--coeff_num >= 0) {

  528.         pos += run_buf[coeff_num];

  529.         if (pos > 63) {

  530.             av_log(h->avctx, AV_LOG_ERROR,

  531.                    "position out of block bounds at pic %d MB(%d,%d)\n",

  532.                    h->cur.poc, h->mbx, h->mby);

  533.             return -1;

  534.         }

  535.         dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;

  536.     }

  537.     return 0;

  538. }

  539. 

  540. /**

  541.  * decode coefficients from one 8x8 block, dequantize, inverse transform

  542.  *  and add them to sample block

  543.  * @param r pointer to 2D VLC table

  544.  * @param esc_golomb_order escape codes are k-golomb with this order k

  545.  * @param qp quantizer

  546.  * @param dst location of sample block

  547.  * @param stride line stride in frame buffer

  548.  */

  549. static int decode_residual_block(AVSContext *h, GetBitContext *gb,

  550.                                  const struct dec_2dvlc *r, int esc_golomb_order,

  551.                                  int qp, uint8_t *dst, int stride)

  552. {

  553.     int i, level_code, esc_code, level, run, mask;

  554.     int16_t level_buf[65];

  555.     uint8_t run_buf[65];

  556.     int16_t *block = h->block;

  557. 

  558.     for (i = 0;i < 65; i++) {

  559.         level_code = get_ue_code(gb, r->golomb_order);

  560.         if (level_code >= ESCAPE_CODE) {

  561.             run      = ((level_code - ESCAPE_CODE) >> 1) + 1;

  562.             esc_code = get_ue_code(gb, esc_golomb_order);

  563.             level    = esc_code + (run > r->max_run ? 1 : r->level_add[run]);

  564.             while (level > r->inc_limit)

  565.                 r++;

  566.             mask  = -(level_code & 1);

  567.             level = (level ^ mask) - mask;

  568.         } else if (level_code >= 0) {

  569.             level = r->rltab[level_code][0];

  570.             if (!level) //end of block signal

  571.                 break;

  572.             run = r->rltab[level_code][1];

  573.             r  += r->rltab[level_code][2];

  574.         } else {

  575.             break;

  576.         }

  577.         level_buf[i] = level;

  578.         run_buf[i]   = run;

  579.     }

  580.     if (dequant(h, level_buf, run_buf, block, dequant_mul[qp],

  581.                 dequant_shift[qp], i))

  582.         return -1;

  583.     h->cdsp.cavs_idct8_add(dst, block, stride);

  584.     h->dsp.clear_block(block);

  585.     return 0;

  586. }

  587. 

  588. 

  589. static inline void decode_residual_chroma(AVSContext *h)

  590. {

  591.     if (h->cbp & (1 << 4))

  592.         decode_residual_block(h, &h->gb, chroma_dec, 0,

  593.                               cavs_chroma_qp[h->qp], h->cu, h->c_stride);

  594.     if (h->cbp & (1 << 5))

  595.         decode_residual_block(h, &h->gb, chroma_dec, 0,

  596.                               cavs_chroma_qp[h->qp], h->cv, h->c_stride);

  597. }

  598. 

  599. static inline int decode_residual_inter(AVSContext *h)

  600. {

  601.     int block;

  602. 

  603.     /* get coded block pattern */

  604.     int cbp = get_ue_golomb(&h->gb);

  605.     if (cbp > 63) {

  606.         av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp\n");

  607.         return -1;

  608.     }

  609.     h->cbp = cbp_tab[cbp][1];

  610. 

  611.     /* get quantizer */

  612.     if (h->cbp && !h->qp_fixed)

  613.         h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;

  614.     for (block = 0; block < 4; block++)

  615.         if (h->cbp & (1 << block))

  616.             decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,

  617.                                   h->cy + h->luma_scan[block], h->l_stride);

  618.     decode_residual_chroma(h);

  619. 

  620.     return 0;

  621. }

  622. 

  623. /*****************************************************************************

  624.  *

  625.  * macroblock level

  626.  *

  627.  ****************************************************************************/

  628. 

  629. static inline void set_mv_intra(AVSContext *h)

  630. {

  631.     h->mv[MV_FWD_X0] = ff_cavs_intra_mv;

  632.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  633.     h->mv[MV_BWD_X0] = ff_cavs_intra_mv;

  634.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  635.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)

  636.         h->col_type_base[h->mbidx] = I_8X8;

  637. }

  638. 

  639. static int decode_mb_i(AVSContext *h, int cbp_code)

  640. {

  641.     GetBitContext *gb = &h->gb;

  642.     unsigned pred_mode_uv;

  643.     int block;

  644.     uint8_t top[18];

  645.     uint8_t *left = NULL;

  646.     uint8_t *d;

  647. 

  648.     ff_cavs_init_mb(h);

  649. 

  650.     /* get intra prediction modes from stream */

  651.     for (block = 0; block < 4; block++) {

  652.         int nA, nB, predpred;

  653.         int pos = scan3x3[block];

  654. 

  655.         nA = h->pred_mode_Y[pos - 1];

  656.         nB = h->pred_mode_Y[pos - 3];

  657.         predpred = FFMIN(nA, nB);

  658.         if (predpred == NOT_AVAIL) // if either is not available

  659.             predpred = INTRA_L_LP;

  660.         if (!get_bits1(gb)) {

  661.             int rem_mode = get_bits(gb, 2);

  662.             predpred     = rem_mode + (rem_mode >= predpred);

  663.         }

  664.         h->pred_mode_Y[pos] = predpred;

  665.     }

  666.     pred_mode_uv = get_ue_golomb(gb);

  667.     if (pred_mode_uv > 6) {

  668.         av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");

  669.         return -1;

  670.     }

  671.     ff_cavs_modify_mb_i(h, &pred_mode_uv);

  672. 

  673.     /* get coded block pattern */

  674.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)

  675.         cbp_code = get_ue_golomb(gb);

  676.     if (cbp_code > 63) {

  677.         av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");

  678.         return -1;

  679.     }

  680.     h->cbp = cbp_tab[cbp_code][0];

  681.     if (h->cbp && !h->qp_fixed)

  682.         h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta

  683. 

  684.     /* luma intra prediction interleaved with residual decode/transform/add */

  685.     for (block = 0; block < 4; block++) {

  686.         d = h->cy + h->luma_scan[block];

  687.         ff_cavs_load_intra_pred_luma(h, top, &left, block);

  688.         h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]

  689.             (d, top, left, h->l_stride);

  690.         if (h->cbp & (1<<block))

  691.             decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);

  692.     }

  693. 

  694.     /* chroma intra prediction */

  695.     ff_cavs_load_intra_pred_chroma(h);

  696.     h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],

  697.                                   h->left_border_u, h->c_stride);

  698.     h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],

  699.                                   h->left_border_v, h->c_stride);

  700. 

  701.     decode_residual_chroma(h);

  702.     ff_cavs_filter(h, I_8X8);

  703.     set_mv_intra(h);

  704.     return 0;

  705. }

  706. 

  707. static inline void set_intra_mode_default(AVSContext *h)

  708. {

  709.     if (h->stream_revision > 0) {

  710.         h->pred_mode_Y[3] =  h->pred_mode_Y[6] = NOT_AVAIL;

  711.         h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;

  712.     } else {

  713.         h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;

  714.         h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;

  715.     }

  716. }

  717. 

  718. static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)

  719. {

  720.     GetBitContext *gb = &h->gb;

  721.     int ref[4];

  722. 

  723.     ff_cavs_init_mb(h);

  724.     switch (mb_type) {

  725.     case P_SKIP:

  726.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP,  BLK_16X16, 0);

  727.         break;

  728.     case P_16X16:

  729.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  730.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);

  731.         break;

  732.     case P_16X8:

  733.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  734.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  735.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,    BLK_16X8, ref[0]);

  736.         ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT,   BLK_16X8, ref[2]);

  737.         break;

  738.     case P_8X16:

  739.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  740.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  741.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT,     BLK_8X16, ref[0]);

  742.         ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);

  743.         break;

  744.     case P_8X8:

  745.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  746.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  747.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  748.         ref[3] = h->ref_flag ? 0 : get_bits1(gb);

  749.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN,   BLK_8X8, ref[0]);

  750.         ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_8X8, ref[1]);

  751.         ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN,   BLK_8X8, ref[2]);

  752.         ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN,   BLK_8X8, ref[3]);

  753.     }

  754.     ff_cavs_inter(h, mb_type);

  755.     set_intra_mode_default(h);

  756.     store_mvs(h);

  757.     if (mb_type != P_SKIP)

  758.         decode_residual_inter(h);

  759.     ff_cavs_filter(h, mb_type);

  760.     h->col_type_base[h->mbidx] = mb_type;

  761. }

  762. 

  763. static void decode_mb_b(AVSContext *h, enum cavs_mb mb_type)

  764. {

  765.     int block;

  766.     enum cavs_sub_mb sub_type[4];

  767.     int flags;

  768. 

  769.     ff_cavs_init_mb(h);

  770. 

  771.     /* reset all MVs */

  772.     h->mv[MV_FWD_X0] = ff_cavs_dir_mv;

  773.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  774.     h->mv[MV_BWD_X0] = ff_cavs_dir_mv;

  775.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  776.     switch (mb_type) {

  777.     case B_SKIP:

  778.     case B_DIRECT:

  779.         if (!h->col_type_base[h->mbidx]) {

  780.             /* intra MB at co-location, do in-plane prediction */

  781.             ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);

  782.             ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);

  783.         } else

  784.             /* direct prediction from co-located P MB, block-wise */

  785.             for (block = 0; block < 4; block++)

  786.                 mv_pred_direct(h, &h->mv[mv_scan[block]],

  787.                                &h->col_mv[h->mbidx * 4 + block]);

  788.         break;

  789.     case B_FWD_16X16:

  790.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  791.         break;

  792.     case B_SYM_16X16:

  793.         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  794.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  795.         break;

  796.     case B_BWD_16X16:

  797.         ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  798.         break;

  799.     case B_8X8:

  800.         for (block = 0; block < 4; block++)

  801.             sub_type[block] = get_bits(&h->gb, 2);

  802.         for (block = 0; block < 4; block++) {

  803.             switch (sub_type[block]) {

  804.             case B_SUB_DIRECT:

  805.                 if (!h->col_type_base[h->mbidx]) {

  806.                     /* intra MB at co-location, do in-plane prediction */

  807.                     ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,

  808.                                MV_PRED_BSKIP, BLK_8X8, 1);

  809.                     ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,

  810.                                mv_scan[block] - 3 + MV_BWD_OFFS,

  811.                                MV_PRED_BSKIP, BLK_8X8, 0);

  812.                 } else

  813.                     mv_pred_direct(h, &h->mv[mv_scan[block]],

  814.                                    &h->col_mv[h->mbidx * 4 + block]);

  815.                 break;

  816.             case B_SUB_FWD:

  817.                 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,

  818.                            MV_PRED_MEDIAN, BLK_8X8, 1);

  819.                 break;

  820.             case B_SUB_SYM:

  821.                 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,

  822.                            MV_PRED_MEDIAN, BLK_8X8, 1);

  823.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  824.                 break;

  825.             }

  826.         }

  827.         for (block = 0; block < 4; block++) {

  828.             if (sub_type[block] == B_SUB_BWD)

  829.                 ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,

  830.                            mv_scan[block] + MV_BWD_OFFS - 3,

  831.                            MV_PRED_MEDIAN, BLK_8X8, 0);

  832.         }

  833.         break;

  834.     default:

  835.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  836.         flags = ff_cavs_partition_flags[mb_type];

  837.         if (mb_type & 1) { /* 16x8 macroblock types */

  838.             if (flags & FWD0)

  839.                 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  840.             if (flags & SYM0)

  841.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  842.             if (flags & FWD1)

  843.                 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  844.             if (flags & SYM1)

  845.                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);

  846.             if (flags & BWD0)

  847.                 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  848.             if (flags & BWD1)

  849.                 ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  850.         } else {          /* 8x16 macroblock types */

  851.             if (flags & FWD0)

  852.                 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  853.             if (flags & SYM0)

  854.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  855.             if (flags & FWD1)

  856.                 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);

  857.             if (flags & SYM1)

  858.                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);

  859.             if (flags & BWD0)

  860.                 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  861.             if (flags & BWD1)

  862.                 ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);

  863.         }

  864.     }

  865.     ff_cavs_inter(h, mb_type);

  866.     set_intra_mode_default(h);

  867.     if (mb_type != B_SKIP)

  868.         decode_residual_inter(h);

  869.     ff_cavs_filter(h, mb_type);

  870. }

  871. 

  872. /*****************************************************************************

  873.  *

  874.  * slice level

  875.  *

  876.  ****************************************************************************/

  877. 

  878. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)

  879. {

  880.     if (h->stc > 0xAF)

  881.         av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  882.     h->mby   = h->stc;

  883.     h->mbidx = h->mby * h->mb_width;

  884. 

  885.     /* mark top macroblocks as unavailable */

  886.     h->flags &= ~(B_AVAIL | C_AVAIL);

  887.     if ((h->mby == 0) && (!h->qp_fixed)) {

  888.         h->qp_fixed = get_bits1(gb);

  889.         h->qp       = get_bits(gb, 6);

  890.     }

  891.     /* inter frame or second slice can have weighting params */

  892.     if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||

  893.         (!h->pic_structure && h->mby >= h->mb_width / 2))

  894.         if (get_bits1(gb)) { //slice_weighting_flag

  895.             av_log(h->avctx, AV_LOG_ERROR,

  896.                    "weighted prediction not yet supported\n");

  897.         }

  898.     return 0;

  899. }

  900. 

  901. static inline int check_for_slice(AVSContext *h)

  902. {

  903.     GetBitContext *gb = &h->gb;

  904.     int align;

  905. 

  906.     if (h->mbx)

  907.         return 0;

  908.     align = (-get_bits_count(gb)) & 7;

  909.     /* check for stuffing byte */

  910.     if (!align && (show_bits(gb, 8) == 0x80))

  911.         align = 8;

  912.     if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {

  913.         skip_bits_long(gb, 24 + align);

  914.         h->stc = get_bits(gb, 8);

  915.         if (h->stc >= h->mb_height)

  916.             return 0;

  917.         decode_slice_header(h, gb);

  918.         return 1;

  919.     }

  920.     return 0;

  921. }

  922. 

  923. /*****************************************************************************

  924.  *

  925.  * frame level

  926.  *

  927.  ****************************************************************************/

  928. 

  929. static int decode_pic(AVSContext *h)

  930. {

  931.     int skip_count    = -1;

  932.     enum cavs_mb mb_type;

  933. 

  934.     if (!h->top_qp) {

  935.         av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");

  936.         return AVERROR_INVALIDDATA;

  937.     }

  938. 

  939.     av_frame_unref(h->cur.f);

  940. 

  941.     skip_bits(&h->gb, 16);//bbv_dwlay

  942.     if (h->stc == PIC_PB_START_CODE) {

  943.         h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;

  944.         if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {

  945.             av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");

  946.             return -1;

  947.         }

  948.         /* make sure we have the reference frames we need */

  949.         if (!h->DPB[0].f->data[0] ||

  950.            (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))

  951.             return -1;

  952.     } else {

  953.         h->cur.f->pict_type = AV_PICTURE_TYPE_I;

  954.         if (get_bits1(&h->gb))

  955.             skip_bits(&h->gb, 24);//time_code

  956.         /* old sample clips were all progressive and no low_delay,

  957.            bump stream revision if detected otherwise */

  958.         if (h->low_delay || !(show_bits(&h->gb, 9) & 1))

  959.             h->stream_revision = 1;

  960.         /* similarly test top_field_first and repeat_first_field */

  961.         else if (show_bits(&h->gb, 11) & 3)

  962.             h->stream_revision = 1;

  963.         if (h->stream_revision > 0)

  964.             skip_bits(&h->gb, 1); //marker_bit

  965.     }

  966. 

  967.     ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?

  968.                   0 : AV_GET_BUFFER_FLAG_REF);

  969. 

  970.     if (!h->edge_emu_buffer) {

  971.         int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);

  972.         h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);

  973.         if (!h->edge_emu_buffer)

  974.             return AVERROR(ENOMEM);

  975.     }

  976. 

  977.     ff_cavs_init_pic(h);

  978.     h->cur.poc = get_bits(&h->gb, 8) * 2;

  979. 

  980.     /* get temporal distances and MV scaling factors */

  981.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  982.         h->dist[0] = (h->cur.poc - h->DPB[0].poc  + 512) % 512;

  983.     } else {

  984.         h->dist[0] = (h->DPB[0].poc  - h->cur.poc + 512) % 512;

  985.     }

  986.     h->dist[1] = (h->cur.poc - h->DPB[1].poc  + 512) % 512;

  987.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  988.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  989.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {

  990.         h->sym_factor = h->dist[0] * h->scale_den[1];

  991.     } else {

  992.         h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;

  993.         h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;

  994.     }

  995. 

  996.     if (h->low_delay)

  997.         get_ue_golomb(&h->gb); //bbv_check_times

  998.     h->progressive   = get_bits1(&h->gb);

  999.     h->pic_structure = 1;

  1000.     if (!h->progressive)

  1001.         h->pic_structure = get_bits1(&h->gb);

  1002.     if (!h->pic_structure && h->stc == PIC_PB_START_CODE)

  1003.         skip_bits1(&h->gb);     //advanced_pred_mode_disable

  1004.     skip_bits1(&h->gb);        //top_field_first

  1005.     skip_bits1(&h->gb);        //repeat_first_field

  1006.     h->qp_fixed = get_bits1(&h->gb);

  1007.     h->qp       = get_bits(&h->gb, 6);

  1008.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1009.         if (!h->progressive && !h->pic_structure)

  1010.             skip_bits1(&h->gb);//what is this?

  1011.         skip_bits(&h->gb, 4);   //reserved bits

  1012.     } else {

  1013.         if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))

  1014.             h->ref_flag        = get_bits1(&h->gb);

  1015.         skip_bits(&h->gb, 4);   //reserved bits

  1016.         h->skip_mode_flag      = get_bits1(&h->gb);

  1017.     }

  1018.     h->loop_filter_disable     = get_bits1(&h->gb);

  1019.     if (!h->loop_filter_disable && get_bits1(&h->gb)) {

  1020.         h->alpha_offset        = get_se_golomb(&h->gb);

  1021.         h->beta_offset         = get_se_golomb(&h->gb);

  1022.     } else {

  1023.         h->alpha_offset = h->beta_offset  = 0;

  1024.     }

  1025.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1026.         do {

  1027.             check_for_slice(h);

  1028.             decode_mb_i(h, 0);

  1029.         } while (ff_cavs_next_mb(h));

  1030.     } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {

  1031.         do {

  1032.             if (check_for_slice(h))

  1033.                 skip_count = -1;

  1034.             if (h->skip_mode_flag && (skip_count < 0))

  1035.                 skip_count = get_ue_golomb(&h->gb);

  1036.             if (h->skip_mode_flag && skip_count--) {

  1037.                 decode_mb_p(h, P_SKIP);

  1038.             } else {

  1039.                 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;

  1040.                 if (mb_type > P_8X8)

  1041.                     decode_mb_i(h, mb_type - P_8X8 - 1);

  1042.                 else

  1043.                     decode_mb_p(h, mb_type);

  1044.             }

  1045.         } while (ff_cavs_next_mb(h));

  1046.     } else { /* AV_PICTURE_TYPE_B */

  1047.         do {

  1048.             if (check_for_slice(h))

  1049.                 skip_count = -1;

  1050.             if (h->skip_mode_flag && (skip_count < 0))

  1051.                 skip_count = get_ue_golomb(&h->gb);

  1052.             if (h->skip_mode_flag && skip_count--) {

  1053.                 decode_mb_b(h, B_SKIP);

  1054.             } else {

  1055.                 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;

  1056.                 if (mb_type > B_8X8)

  1057.                     decode_mb_i(h, mb_type - B_8X8 - 1);

  1058.                 else

  1059.                     decode_mb_b(h, mb_type);

  1060.             }

  1061.         } while (ff_cavs_next_mb(h));

  1062.     }

  1063.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1064.         av_frame_unref(h->DPB[1].f);

  1065.         FFSWAP(AVSFrame, h->cur, h->DPB[1]);

  1066.         FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);

  1067.     }

  1068.     return 0;

  1069. }

  1070. 

  1071. /*****************************************************************************

  1072.  *

  1073.  * headers and interface

  1074.  *

  1075.  ****************************************************************************/

  1076. 

  1077. static int decode_seq_header(AVSContext *h)

  1078. {

  1079.     int frame_rate_code;

  1080.     int width, height;

  1081. 

  1082.     h->profile = get_bits(&h->gb, 8);

  1083.     h->level   = get_bits(&h->gb, 8);

  1084.     skip_bits1(&h->gb); //progressive sequence

  1085. 

  1086.     width  = get_bits(&h->gb, 14);

  1087.     height = get_bits(&h->gb, 14);

  1088.     if ((h->width || h->height) && (h->width != width || h->height != height)) {

  1089.         avpriv_report_missing_feature(h->avctx,

  1090.                                       "Width/height changing in CAVS");

  1091.         return AVERROR_PATCHWELCOME;

  1092.     }

  1093.     h->width  = width;

  1094.     h->height = height;

  1095. 

  1096.     skip_bits(&h->gb, 2); //chroma format

  1097.     skip_bits(&h->gb, 3); //sample_precision

  1098.     h->aspect_ratio = get_bits(&h->gb, 4);

  1099.     frame_rate_code = get_bits(&h->gb, 4);

  1100.     skip_bits(&h->gb, 18); //bit_rate_lower

  1101.     skip_bits1(&h->gb);    //marker_bit

  1102.     skip_bits(&h->gb, 12); //bit_rate_upper

  1103.     h->low_delay =  get_bits1(&h->gb);

  1104.     h->mb_width  = (h->width  + 15) >> 4;

  1105.     h->mb_height = (h->height + 15) >> 4;

  1106.     h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;

  1107.     h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;

  1108.     h->avctx->width  = h->width;

  1109.     h->avctx->height = h->height;

  1110.     if (!h->top_qp)

  1111.         ff_cavs_init_top_lines(h);

  1112.     return 0;

  1113. }

  1114. 

  1115. static void cavs_flush(AVCodecContext * avctx)

  1116. {

  1117.     AVSContext *h = avctx->priv_data;

  1118.     h->got_keyframe = 0;

  1119. }

  1120. 

  1121. static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1122.                              AVPacket *avpkt)

  1123. {

  1124.     AVSContext *h      = avctx->priv_data;

  1125.     const uint8_t *buf = avpkt->data;

  1126.     int buf_size       = avpkt->size;

  1127.     uint32_t stc       = -1;

  1128.     int input_size, ret;

  1129.     const uint8_t *buf_end;

  1130.     const uint8_t *buf_ptr;

  1131. 

  1132.     if (buf_size == 0) {

  1133.         if (!h->low_delay && h->DPB[0].f->data[0]) {

  1134.             *got_frame = 1;

  1135.             av_frame_move_ref(data, h->DPB[0].f);

  1136.         }

  1137.         return 0;

  1138.     }

  1139. 

  1140.     buf_ptr = buf;

  1141.     buf_end = buf + buf_size;

  1142.     for(;;) {

  1143.         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);

  1144.         if ((stc & 0xFFFFFE00) || buf_ptr == buf_end)

  1145.             return FFMAX(0, buf_ptr - buf);

  1146.         input_size = (buf_end - buf_ptr) * 8;

  1147.         switch (stc) {

  1148.         case CAVS_START_CODE:

  1149.             init_get_bits(&h->gb, buf_ptr, input_size);

  1150.             decode_seq_header(h);

  1151.             break;

  1152.         case PIC_I_START_CODE:

  1153.             if (!h->got_keyframe) {

  1154.                 av_frame_unref(h->DPB[0].f);

  1155.                 av_frame_unref(h->DPB[1].f);

  1156.                 h->got_keyframe = 1;

  1157.             }

  1158.         case PIC_PB_START_CODE:

  1159.             *got_frame = 0;

  1160.             if (!h->got_keyframe)

  1161.                 break;

  1162.             init_get_bits(&h->gb, buf_ptr, input_size);

  1163.             h->stc = stc;

  1164.             if (decode_pic(h))

  1165.                 break;

  1166.             *got_frame = 1;

  1167.             if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1168.                 if (h->DPB[1].f->data[0]) {

  1169.                     if ((ret = av_frame_ref(data, h->DPB[1].f)) < 0)

  1170.                         return ret;

  1171.                 } else {

  1172.                     *got_frame = 0;

  1173.                 }

  1174.             } else {

  1175.                 av_frame_move_ref(data, h->cur.f);

  1176.             }

  1177.             break;

  1178.         case EXT_START_CODE:

  1179.             //mpeg_decode_extension(avctx, buf_ptr, input_size);

  1180.             break;

  1181.         case USER_START_CODE:

  1182.             //mpeg_decode_user_data(avctx, buf_ptr, input_size);

  1183.             break;

  1184.         default:

  1185.             if (stc <= SLICE_MAX_START_CODE) {

  1186.                 init_get_bits(&h->gb, buf_ptr, input_size);

  1187.                 decode_slice_header(h, &h->gb);

  1188.             }

  1189.             break;

  1190.         }

  1191.     }

  1192. }

  1193. 

  1194. AVCodec ff_cavs_decoder = {

  1195.     .name           = "cavs",

  1196.     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),

  1197.     .type           = AVMEDIA_TYPE_VIDEO,

  1198.     .id             = AV_CODEC_ID_CAVS,

  1199.     .priv_data_size = sizeof(AVSContext),

  1200.     .init           = ff_cavs_init,

  1201.     .close          = ff_cavs_end,

  1202.     .decode         = cavs_decode_frame,

  1203.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1204.     .flush          = cavs_flush,

  1205. };