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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 FFmpeg.

  6.  *

  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "libavutil/avassert.h"

  29. #include "avcodec.h"

  30. #include "get_bits.h"

  31. #include "golomb.h"

  32. #include "cavs.h"

  33. #include "internal.h"

  34. #include "mpeg12data.h"

  35. #include "mpegvideo.h"

  36. 

  37. static const uint8_t mv_scan[4] = {

  38.     MV_FWD_X0, MV_FWD_X1,

  39.     MV_FWD_X2, MV_FWD_X3

  40. };

  41. 

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

  43.   { 63,  0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, {  0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },

  44.   {  7, 14 }, {  5, 11 }, { 10, 12 }, {  8,  5 }, { 12, 10 }, { 61,  7 }, {  4, 48 }, { 55,  3 },

  45.   {  1,  2 }, {  2,  8 }, { 59,  4 }, {  3,  1 }, { 62, 61 }, {  9, 55 }, {  6, 59 }, { 29, 62 },

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

  47.   { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },

  48.   { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },

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

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

  51. };

  52. 

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

  54. 

  55. static const uint8_t cavs_chroma_qp[64] = {

  56.    0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,

  57.   16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,

  58.   32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,

  59.   45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51

  60. };

  61. 

  62. static const uint8_t dequant_shift[64] = {

  63.   14, 14, 14, 14, 14, 14, 14, 14,

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

  65.   13, 12, 12, 12, 12, 12, 12, 12,

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

  67.   11, 10, 10, 10, 10, 10, 10, 10,

  68.   10,  9,  9,  9,  9,  9,  9,  9,

  69.   9,   8,  8,  8,  8,  8,  8,  8,

  70.   7,   7,  7,  7,  7,  7,  7,  7

  71. };

  72. 

  73. static const uint16_t dequant_mul[64] = {

  74.   32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,

  75.   32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,

  76.   65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,

  77.   32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,

  78.   65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,

  79.   65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,

  80.   65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,

  81.   32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099

  82. };

  83. 

  84. #define EOB 0, 0, 0

  85. 

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

  87.     {

  88.         { //level / run / table_inc

  89.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3, 1 },

  90.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6, 1 },

  91.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9, 1 },

  92.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  2,  1,  2 }, { -2,  1, 2 },

  93.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14, 1 },

  94.             {  1, 15,  1 }, { -1, 15,  1 }, {  2,  2,  2 }, { -2,  2,  2 }, {  1, 16,  1 }, { -1, 16, 1 },

  95.             {  1, 17,  1 }, { -1, 17,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 18,  1 }, { -1, 18, 1 },

  96.             {  1, 19,  1 }, { -1, 19,  1 }, {  2,  3,  2 }, { -2,  3,  2 }, {  1, 20,  1 }, { -1, 20, 1 },

  97.             {  1, 21,  1 }, { -1, 21,  1 }, {  2,  4,  2 }, { -2,  4,  2 }, {  1, 22,  1 }, { -1, 22, 1 },

  98.             {  2,  5,  2 }, { -2,  5,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {   EOB    }

  99.         },

  100.         //level_add

  101.         { 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 },

  102.         2, //golomb_order

  103.         0, //inc_limit

  104.         23, //max_run

  105.     },

  106.     {

  107.         { //level / run

  108.             {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 }, { -2,  1,  1 },

  109.             {  1,  3,  0 }, { -1,  3,  0 }, {     EOB    }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  110.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  2,  2,  1 },

  111.             { -2,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  1,  9,  0 },

  112.             { -1,  9,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  4,  1,  2 }, { -4,  1,  2 }, {  1, 10,  0 },

  113.             { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  3,  2,  2 },

  114.             { -3,  2,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  5,  1,  3 },

  115.             { -5,  1,  3 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 14,  0 },

  116.             { -1, 14,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  2,  8,  1 }, { -2,  8,  1 }, {  3,  3,  2 },

  117.             { -3,  3,  2 }, {  6,  1,  3 }, { -6,  1,  3 }, {  1, 15,  0 }, { -1, 15,  0 }

  118.         },

  119.         //level_add

  120.         { 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 },

  121.         2, //golomb_order

  122.         1, //inc_limit

  123.         15, //max_run

  124.     },

  125.     {

  126.         { //level / run

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

  128.             {  3,  1,  1 }, { -3,  1,  1 }, {     EOB    }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  129.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  130.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  131.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  2,  4,  0 },

  132.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  133.             { -7,  1,  2 }, {  3,  3,  1 }, { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 },

  134.             { -1,  8,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  3 }, { -8,  1,  3 }, {  1,  9,  0 },

  135.             { -1,  9,  0 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 }, {  2,  7,  0 },

  136.             { -2,  7,  0 }, {  9,  1,  3 }, { -9,  1,  3 }, {  1, 10,  0 }, { -1, 10,  0 }

  137.         },

  138.         //level_add

  139.         { 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 },

  140.         2, //golomb_order

  141.         2, //inc_limit

  142.         10, //max_run

  143.     },

  144.     {

  145.         { //level / run

  146.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

  147.             {  1,  2,  0 }, { -1,  2,  0 }, {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  1 },

  148.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  1 },

  149.             { -6,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  150.             { -1,  4,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  151.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  5,  2,  1 },

  152.             { -5,  2,  1 }, {  2,  4,  0 }, { -2,  4,  0 }, { 10,  1,  2 }, {-10,  1,  2 }, {  3,  3,  0 },

  153.             { -3,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 11,  1,  3 }, {-11,  1,  3 }, {  6,  2,  1 },

  154.             { -6,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  5,  0 }, { -2,  5,  0 }, {  3,  4,  0 },

  155.             { -3,  4,  0 }, { 12,  1,  3 }, {-12,  1,  3 }, {  4,  3,  0 }, { -4,  3,  0 }

  156.          },

  157.         //level_add

  158.         { 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 },

  159.         2, //golomb_order

  160.         4, //inc_limit

  161.         7, //max_run

  162.     },

  163.     {

  164.         { //level / run

  165.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

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

  167.             { -6,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  1 },

  168.             { -8,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, { 10,  1,  1 },

  169.             {-10,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 11,  1,  2 },

  170.             {-11,  1,  2 }, {  4,  2,  0 }, { -4,  2,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, { 13,  1,  2 },

  171.             {-13,  1,  2 }, {  5,  2,  0 }, { -5,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 },

  172.             { -2,  3,  0 }, { 14,  1,  2 }, {-14,  1,  2 }, {  6,  2,  0 }, { -6,  2,  0 }, { 15,  1,  2 },

  173.             {-15,  1,  2 }, { 16,  1,  2 }, {-16,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  5,  0 },

  174.             { -1,  5,  0 }, {  7,  2,  0 }, { -7,  2,  0 }, { 17,  1,  2 }, {-17,  1,  2 }

  175.         },

  176.         //level_add

  177.         { 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 },

  178.         2, //golomb_order

  179.         7, //inc_limit

  180.         5, //max_run

  181.     },

  182.     {

  183.         { //level / run

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

  185.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  186.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  187.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 11,  1,  1 },

  188.             {-11,  1,  1 }, { 12,  1,  1 }, {-12,  1,  1 }, { 13,  1,  1 }, {-13,  1,  1 }, {  2,  2,  0 },

  189.             { -2,  2,  0 }, { 14,  1,  1 }, {-14,  1,  1 }, { 15,  1,  1 }, {-15,  1,  1 }, {  3,  2,  0 },

  190.             { -3,  2,  0 }, { 16,  1,  1 }, {-16,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, { 17,  1,  1 },

  191.             {-17,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, { 18,  1,  1 }, {-18,  1,  1 }, {  5,  2,  0 },

  192.             { -5,  2,  0 }, { 19,  1,  1 }, {-19,  1,  1 }, { 20,  1,  1 }, {-20,  1,  1 }, {  6,  2,  0 },

  193.             { -6,  2,  0 }, { 21,  1,  1 }, {-21,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }

  194.         },

  195.         //level_add

  196.         { 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 },

  197.         2, //golomb_order

  198.         10, //inc_limit

  199.         3, //max_run

  200.     },

  201.     {

  202.         { //level / run

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

  204.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  205.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  206.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, { 11,  1,  0 }, {-11,  1,  0 }, { 12,  1,  0 },

  207.             {-12,  1,  0 }, { 13,  1,  0 }, {-13,  1,  0 }, { 14,  1,  0 }, {-14,  1,  0 }, { 15,  1,  0 },

  208.             {-15,  1,  0 }, { 16,  1,  0 }, {-16,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 17,  1,  0 },

  209.             {-17,  1,  0 }, { 18,  1,  0 }, {-18,  1,  0 }, { 19,  1,  0 }, {-19,  1,  0 }, { 20,  1,  0 },

  210.             {-20,  1,  0 }, { 21,  1,  0 }, {-21,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, { 22,  1,  0 },

  211.             {-22,  1,  0 }, { 23,  1,  0 }, {-23,  1,  0 }, { 24,  1,  0 }, {-24,  1,  0 }, { 25,  1,  0 },

  212.             {-25,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 26,  1,  0 }, {-26,  1,  0 }

  213.         },

  214.         //level_add

  215.         { 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 },

  216.         2, //golomb_order

  217.         INT_MAX, //inc_limit

  218.         2, //max_run

  219.     }

  220. };

  221. 

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

  223.     {

  224.         { //level / run

  225.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  226.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  227.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9,  1 },

  228.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  1, 12,  1 }, { -1, 12,  1 },

  229.             {  1, 13,  1 }, { -1, 13,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1, 14,  1 }, { -1, 14,  1 },

  230.             {  1, 15,  1 }, { -1, 15,  1 }, {  1, 16,  1 }, { -1, 16,  1 }, {  1, 17,  1 }, { -1, 17,  1 },

  231.             {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 }, {  3,  1,  3 }, { -3,  1,  3 },

  232.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  2,  2,  2 }, { -2,  2,  2 },

  233.             {  1, 22,  1 }, { -1, 22,  1 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  234.             {  1, 25,  1 }, { -1, 25,  1 }, {  1, 26,  1 }, { -1, 26,  1 }, {   EOB    }

  235.         },

  236.         //level_add

  237.         { 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 },

  238.         3, //golomb_order

  239.         0, //inc_limit

  240.         26 //max_run

  241.     },

  242.     {

  243.         { //level / run

  244.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  1,  3,  0 },

  245.             { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  246.             { -1,  6,  0 }, {  2,  1,  1 }, { -2,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 },

  247.             { -1,  8,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  2,  2,  1 },

  248.             { -2,  2,  1 }, {  1, 11,  0 }, { -1, 11,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  1,  2 },

  249.             { -3,  1,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 }, { -1, 14,  0 }, {  2,  3,  1 },

  250.             { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  1, 16,  0 },

  251.             { -1, 16,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  1, 17,  0 }, { -1, 17,  0 }, {  4,  1,  3 },

  252.             { -4,  1,  3 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 18,  0 }, { -1, 18,  0 }, {  1, 19,  0 },

  253.             { -1, 19,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  3,  2,  2 }, { -3,  2,  2 }

  254.         },

  255.         //level_add

  256.         { 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 },

  257.         2, //golomb_order

  258.         1, //inc_limit

  259.         19 //max_run

  260.     },

  261.     {

  262.         { //level / run

  263.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  0 },

  264.             { -2,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  3,  1,  1 },

  265.             { -3,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  266.             { -1,  6,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  1,  2 },

  267.             { -4,  1,  2 }, {  1,  8,  0 }, { -1,  8,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  4,  0 },

  268.             { -2,  4,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  5,  1,  2 },

  269.             { -5,  1,  2 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  6,  0 },

  270.             { -2,  6,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  3,  1 }, { -3,  3,  1 }, {  6,  1,  2 },

  271.             { -6,  1,  2 }, {  4,  2,  2 }, { -4,  2,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  7,  0 },

  272.             { -2,  7,  0 }, {  3,  4,  1 }, { -3,  4,  1 }, {  1, 14,  0 }, { -1, 14,  0 }

  273.         },

  274.         //level_add

  275.         { 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 },

  276.         2, //golomb_order

  277.         2, //inc_limit

  278.         14 //max_run

  279.     },

  280.     {

  281.         { //level / run

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

  283.             { -1,  2,  0 }, {  3,  1,  0 }, { -3,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  284.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  1 },

  285.             { -5,  1,  1 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  2,  3,  0 },

  286.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  2,  4,  0 },

  287.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  288.             { -7,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  5,  0 },

  289.             { -2,  5,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  4,  0 },

  290.             { -3,  4,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  1, 10,  0 },

  291.             { -1, 10,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  4,  3,  1 }, { -4,  3,  1 }

  292.         },

  293.         //level_add

  294.         { 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 },

  295.         2, //golomb_order

  296.         3, //inc_limit

  297.         10 //max_run

  298.     },

  299.     {

  300.         { //level / run

  301.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  302.             { -3,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 },

  303.             { -5,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  0 },

  304.             { -6,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  305.             { -1,  4,  0 }, {  8,  1,  1 }, { -8,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  306.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, {  5,  2,  0 },

  307.             { -5,  2,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 10,  1,  2 },

  308.             {-10,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, { 11,  1,  2 }, {-11,  1,  2 }, {  1,  7,  0 },

  309.             { -1,  7,  0 }, {  6,  2,  0 }, { -6,  2,  0 }, {  3,  4,  0 }, { -3,  4,  0 }, {  2,  5,  0 },

  310.             { -2,  5,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, {  4,  3,  0 }, { -4,  3,  0 }

  311.         },

  312.         //level_add

  313.         { 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 },

  314.         2, //golomb_order

  315.         6, //inc_limit

  316.         7  //max_run

  317.     },

  318.     {

  319.         { //level / run

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

  321.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  1,  2,  0 },

  322.             {  -1,  2,  0 }, {  6,  1,  0 }, {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 },

  323.             {  -8,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, {  1,  3,  0 },

  324.             {  -1,  3,  0 }, { 10,  1,  1 }, { -10,  1,  1 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 11,  1,  1 },

  325.             { -11,  1,  1 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 12,  1,  1 }, { -12,  1,  1 }, {  1,  4,  0 },

  326.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 13,  1,  1 }, { -13,  1,  1 }, {  5,  2,  0 },

  327.             {  -5,  2,  0 }, { 14,  1,  1 }, { -14,  1,  1 }, {  6,  2,  0 }, {  -6,  2,  0 }, {  1,  5,  0 },

  328.             {  -1,  5,  0 }, { 15,  1,  1 }, { -15,  1,  1 }, {  3,  3,  0 }, {  -3,  3,  0 }, { 16,  1,  1 },

  329.             { -16,  1,  1 }, {  2,  4,  0 }, {  -2,  4,  0 }, {  7,  2,  0 }, {  -7,  2,  0 }

  330.         },

  331.         //level_add

  332.         { 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 },

  333.         2, //golomb_order

  334.         9, //inc_limit

  335.         5  //max_run

  336.     },

  337.     {

  338.         { //level / run

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

  340.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {   6,  1,  0 },

  341.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  1,  2,  0 }, {  -1,  2,  0 }, {   8,  1,  0 },

  342.             {  -8,  1,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, {  11,  1,  0 },

  343.             { -11,  1,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  13,  1,  0 },

  344.             { -13,  1,  0 }, {  1,  3,  0 }, {  -1,  3,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  15,  1,  0 },

  345.             { -15,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 16,  1,  0 }, { -16,  1,  0 }, {  17,  1,  0 },

  346.             { -17,  1,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, {  19,  1,  0 },

  347.             { -19,  1,  0 }, { 20,  1,  0 }, { -20,  1,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, {   1,  4,  0 },

  348.             {  -1,  4,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, { 21,  1,  0 }, { -21,  1,  0 }

  349.         },

  350.         //level_add

  351.         { 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 },

  352.         2, //golomb_order

  353.         INT_MAX, //inc_limit

  354.         4 //max_run

  355.     }

  356. };

  357. 

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

  359.     {

  360.         { //level / run

  361.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  362.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  363.             {  1,  7,  1 }, { -1,  7,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1,  8,  1 }, { -1,  8,  1 },

  364.             {  1,  9,  1 }, { -1,  9,  1 }, {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 },

  365.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14,  1 },

  366.             {  1, 15,  1 }, { -1, 15,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 16,  1 }, { -1, 16,  1 },

  367.             {  1, 17,  1 }, { -1, 17,  1 }, {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 },

  368.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  1, 22,  1 }, { -1, 22,  1 },

  369.             {  2,  2,  2 }, { -2,  2,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  370.             {  1, 25,  1 }, { -1, 25,  1 }, {  4,  1,  3 }, { -4,  1,  3 }, {   EOB    }

  371.         },

  372.         //level_add

  373.         { 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 },

  374.         2, //golomb_order

  375.         0, //inc_limit

  376.         25 //max_run

  377.     },

  378.     {

  379.         { //level / run

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

  381.             { -2,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  382.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  1,  7,  0 },

  383.             { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  2,  1 }, { -2,  2,  1 }, {  1,  9,  0 },

  384.             { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  4,  1,  2 },

  385.             { -4,  1,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 },

  386.             { -1, 14,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 },

  387.             { -2,  4,  1 }, {  5,  1,  3 }, { -5,  1,  3 }, {  3,  2,  2 }, { -3,  2,  2 }, {  1, 16,  0 },

  388.             { -1, 16,  0 }, {  1, 17,  0 }, { -1, 17,  0 }, {  1, 18,  0 }, { -1, 18,  0 }, {  2,  5,  1 },

  389.             { -2,  5,  1 }, {  1, 19,  0 }, { -1, 19,  0 }, {  1, 20,  0 }, { -1, 20,  0 }

  390.         },

  391.         //level_add

  392.         { 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 },

  393.         0, //golomb_order

  394.         1, //inc_limit

  395.         20 //max_run

  396.     },

  397.     {

  398.         { //level / run

  399.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },

  400.             { -1,  2,  0 }, {  3,  1,  1 }, { -3,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  4,  1,  1 },

  401.             { -4,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  402.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  403.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  1,  7,  0 },

  404.             { -1,  7,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  7,  1,  2 }, { -7,  1,  2 }, {  1,  8,  0 },

  405.             { -1,  8,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  3,  1 },

  406.             { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  2 },

  407.             { -8,  1,  2 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  9,  1,  2 },

  408.             { -9,  1,  2 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 },

  409.         },

  410.         //level_add

  411.         { 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 },

  412.         1, //golomb_order

  413.         2, //inc_limit

  414.         11 //max_run

  415.     },

  416.     {

  417.         { //level / run

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

  419.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  5,  1,  1 },

  420.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  1,  3,  0 },

  421.             { -1,  3,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  8,  1,  1 },

  422.             { -8,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  9,  1,  1 },

  423.             { -9,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, { 10,  1,  1 },

  424.             {-10,  1,  1 }, {  3,  3,  0 }, { -3,  3,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  2,  4,  0 },

  425.             { -2,  4,  0 }, { 11,  1,  1 }, {-11,  1,  1 }, {  1,  6,  0 }, { -1,  6,  0 }, { 12,  1,  1 },

  426.             {-12,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  6,  2,  1 }, { -6,  2,  1 }, { 13,  1,  1 },

  427.             {-13,  1,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 }, { -1,  8,  0 },

  428.         },

  429.         //level_add

  430.         { 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 },

  431.         1, //golomb_order

  432.         4, //inc_limit

  433.         8  //max_run

  434.     },

  435.     {

  436.         { //level / run

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

  438.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  6,  1,  0 },

  439.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 }, {  -8,  1,  0 }, {  1,  2,  0 },

  440.             {  -1,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, { 11,  1,  0 },

  441.             { -11,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, { 13,  1,  0 },

  442.             { -13,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  1,  3,  0 },

  443.             {  -1,  3,  0 }, { 15,  1,  0 }, { -15,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 16,  1,  0 },

  444.             { -16,  1,  0 }, { 17,  1,  0 }, { -17,  1,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, {  1,  4,  0 },

  445.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  6,  2,  0 },

  446.             {  -6,  2,  0 }, { 19,  1,  0 }, { -19,  1,  0 }, {  1,  5,  0 }, {  -1,  5,  0 },

  447.         },

  448.         //level_add

  449.         { 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 },

  450.         0, //golomb_order

  451.         INT_MAX, //inc_limit

  452.         5, //max_run

  453.     }

  454. };

  455. 

  456. #undef EOB

  457. 

  458. /*****************************************************************************

  459.  *

  460.  * motion vector prediction

  461.  *

  462.  ****************************************************************************/

  463. 

  464. static inline void store_mvs(AVSContext *h)

  465. {

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

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

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

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

  470. }

  471. 

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

  473.                                   cavs_vector *col_mv)

  474. {

  475.     cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  478. 

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

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

  481.     pmv_fw->ref = 1;

  482.     pmv_bw->ref = 0;

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

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

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

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

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

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

  489. }

  490. 

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

  492.                                enum cavs_block size)

  493. {

  494.     cavs_vector *dst = src + MV_BWD_OFFS;

  495. 

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

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

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

  499.     dst->ref = 0;

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

  501.     set_mvs(dst, size);

  502. }

  503. 

  504. /*****************************************************************************

  505.  *

  506.  * residual data decoding

  507.  *

  508.  ****************************************************************************/

  509. 

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

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

  512. {

  513.     if (order) {

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

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

  516.     }

  517.     return get_ue_golomb(gb);

  518. }

  519. 

  520. static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,

  521.                           DCTELEM *dst, int mul, int shift, int coeff_num)

  522. {

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

  524.     int pos = -1;

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

  526. 

  527.     /* inverse scan and dequantization */

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

  529.         pos += run_buf[coeff_num];

  530.         if (pos > 63) {

  531.             av_log(h->avctx, AV_LOG_ERROR,

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

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

  534.             return -1;

  535.         }

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

  537.     }

  538.     return 0;

  539. }

  540. 

  541. /**

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

  543.  *  and add them to sample block

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

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

  546.  * @param qp quantizer

  547.  * @param dst location of sample block

  548.  * @param stride line stride in frame buffer

  549.  */

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

  551.                                  const struct dec_2dvlc *r, int esc_golomb_order,

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

  553. {

  554.     int i, esc_code, level, mask;

  555.     unsigned int level_code, run;

  556.     DCTELEM level_buf[65];

  557.     uint8_t run_buf[65];

  558.     DCTELEM *block = h->block;

  559. 

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

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

  562.         if (level_code >= ESCAPE_CODE) {

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

  564.             if(run > 64)

  565.                 return -1;

  566.             esc_code = get_ue_code(gb, esc_golomb_order);

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

  568.             while (level > r->inc_limit)

  569.                 r++;

  570.             mask  = -(level_code & 1);

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

  572.         } else {

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

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

  575.                 break;

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

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

  578.         }

  579.         level_buf[i] = level;

  580.         run_buf[i]   = run;

  581.     }

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

  583.                 dequant_shift[qp], i))

  584.         return -1;

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

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

  587.     return 0;

  588. }

  589. 

  590. 

  591. static inline void decode_residual_chroma(AVSContext *h)

  592. {

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

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

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

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

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

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

  599. }

  600. 

  601. static inline int decode_residual_inter(AVSContext *h)

  602. {

  603.     int block;

  604. 

  605.     /* get coded block pattern */

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

  607.     if (cbp > 63U) {

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

  609.         return -1;

  610.     }

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

  612. 

  613.     /* get quantizer */

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

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

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

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

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

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

  620.     decode_residual_chroma(h);

  621. 

  622.     return 0;

  623. }

  624. 

  625. /*****************************************************************************

  626.  *

  627.  * macroblock level

  628.  *

  629.  ****************************************************************************/

  630. 

  631. static inline void set_mv_intra(AVSContext *h)

  632. {

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

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

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

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

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

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

  639. }

  640. 

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

  642. {

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

  644.     unsigned pred_mode_uv;

  645.     int block;

  646.     uint8_t top[18];

  647.     uint8_t *left = NULL;

  648.     uint8_t *d;

  649. 

  650.     ff_cavs_init_mb(h);

  651. 

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

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

  654.         int nA, nB, predpred;

  655.         int pos = scan3x3[block];

  656. 

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

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

  659.         predpred = FFMIN(nA, nB);

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

  661.             predpred = INTRA_L_LP;

  662.         if (!get_bits1(gb)) {

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

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

  665.         }

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

  667.     }

  668.     pred_mode_uv = get_ue_golomb(gb);

  669.     if (pred_mode_uv > 6) {

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

  671.         return -1;

  672.     }

  673.     ff_cavs_modify_mb_i(h, &pred_mode_uv);

  674. 

  675.     /* get coded block pattern */

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

  677.         cbp_code = get_ue_golomb(gb);

  678.     if (cbp_code > 63U) {

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

  680.         return -1;

  681.     }

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

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

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

  685. 

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

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

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

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

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

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

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

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

  694.     }

  695. 

  696.     /* chroma intra prediction */

  697.     ff_cavs_load_intra_pred_chroma(h);

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

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

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

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

  702. 

  703.     decode_residual_chroma(h);

  704.     ff_cavs_filter(h, I_8X8);

  705.     set_mv_intra(h);

  706.     return 0;

  707. }

  708. 

  709. static inline void set_intra_mode_default(AVSContext *h)

  710. {

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

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

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

  714.     } else {

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

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

  717.     }

  718. }

  719. 

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

  721. {

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

  723.     int ref[4];

  724. 

  725.     ff_cavs_init_mb(h);

  726.     switch (mb_type) {

  727.     case P_SKIP:

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

  729.         break;

  730.     case P_16X16:

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

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

  733.         break;

  734.     case P_16X8:

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

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

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

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

  739.         break;

  740.     case P_8X16:

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

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

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

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

  745.         break;

  746.     case P_8X8:

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

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

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

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

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

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

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

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

  755.     }

  756.     ff_cavs_inter(h, mb_type);

  757.     set_intra_mode_default(h);

  758.     store_mvs(h);

  759.     if (mb_type != P_SKIP)

  760.         decode_residual_inter(h);

  761.     ff_cavs_filter(h, mb_type);

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

  763. }

  764. 

  765. static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)

  766. {

  767.     int block;

  768.     enum cavs_sub_mb sub_type[4];

  769.     int flags;

  770. 

  771.     ff_cavs_init_mb(h);

  772. 

  773.     /* reset all MVs */

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

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

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

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

  778.     switch (mb_type) {

  779.     case B_SKIP:

  780.     case B_DIRECT:

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

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

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

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

  785.         } else

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

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

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

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

  790.         break;

  791.     case B_FWD_16X16:

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

  793.         break;

  794.     case B_SYM_16X16:

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

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

  797.         break;

  798.     case B_BWD_16X16:

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

  800.         break;

  801.     case B_8X8:

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

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

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

  805.             switch (sub_type[block]) {

  806.             case B_SUB_DIRECT:

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

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

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

  810.                                MV_PRED_BSKIP, BLK_8X8, 1);

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

  812.                                mv_scan[block] - 3 + MV_BWD_OFFS,

  813.                                MV_PRED_BSKIP, BLK_8X8, 0);

  814.                 } else

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

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

  817.                 break;

  818.             case B_SUB_FWD:

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

  820.                            MV_PRED_MEDIAN, BLK_8X8, 1);

  821.                 break;

  822.             case B_SUB_SYM:

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

  824.                            MV_PRED_MEDIAN, BLK_8X8, 1);

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

  826.                 break;

  827.             }

  828.         }

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

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

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

  832.                            mv_scan[block] + MV_BWD_OFFS - 3,

  833.                            MV_PRED_MEDIAN, BLK_8X8, 0);

  834.         }

  835.         break;

  836.     default:

  837.         if (mb_type <= B_SYM_16X16) {

  838.             av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);

  839.             return AVERROR_INVALIDDATA;

  840.         }

  841.         av_assert2(mb_type < B_8X8);

  842.         flags = ff_cavs_partition_flags[mb_type];

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

  844.             if (flags & FWD0)

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

  846.             if (flags & SYM0)

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

  848.             if (flags & FWD1)

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

  850.             if (flags & SYM1)

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

  852.             if (flags & BWD0)

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

  854.             if (flags & BWD1)

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

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

  857.             if (flags & FWD0)

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

  859.             if (flags & SYM0)

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

  861.             if (flags & FWD1)

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

  863.             if (flags & SYM1)

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

  865.             if (flags & BWD0)

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

  867.             if (flags & BWD1)

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

  869.         }

  870.     }

  871.     ff_cavs_inter(h, mb_type);

  872.     set_intra_mode_default(h);

  873.     if (mb_type != B_SKIP)

  874.         decode_residual_inter(h);

  875.     ff_cavs_filter(h, mb_type);

  876. 

  877.     return 0;

  878. }

  879. 

  880. /*****************************************************************************

  881.  *

  882.  * slice level

  883.  *

  884.  ****************************************************************************/

  885. 

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

  887. {

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

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

  890. 

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

  892.         return -1;

  893. 

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

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

  896. 

  897.     /* mark top macroblocks as unavailable */

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

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

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

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

  902.     }

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

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

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

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

  907.             av_log(h->avctx, AV_LOG_ERROR,

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

  909.         }

  910.     return 0;

  911. }

  912. 

  913. static inline int check_for_slice(AVSContext *h)

  914. {

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

  916.     int align;

  917. 

  918.     if (h->mbx)

  919.         return 0;

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

  921.     /* check for stuffing byte */

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

  923.         align = 8;

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

  925.         skip_bits_long(gb, 24 + align);

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

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

  928.             return 0;

  929.         decode_slice_header(h, gb);

  930.         return 1;

  931.     }

  932.     return 0;

  933. }

  934. 

  935. /*****************************************************************************

  936.  *

  937.  * frame level

  938.  *

  939.  ****************************************************************************/

  940. 

  941. static int decode_pic(AVSContext *h)

  942. {

  943.     int skip_count    = -1;

  944.     int ret;

  945.     enum cavs_mb mb_type;

  946. 

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

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

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

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

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

  952.             return -1;

  953.         }

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

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

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

  957.             return -1;

  958.     } else {

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

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

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

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

  963.            bump stream revision if detected otherwise */

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

  965.             h->stream_revision = 1;

  966.         /* similarly test top_field_first and repeat_first_field */

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

  968.             h->stream_revision = 1;

  969.         if (h->stream_revision > 0)

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

  971.     }

  972.     /* release last B frame */

  973.     if (h->cur.f->data[0])

  974.         h->avctx->release_buffer(h->avctx, h->cur.f);

  975. 

  976.     if ((ret = ff_get_buffer(h->avctx, h->cur.f)) < 0)

  977.         return ret;

  978. 

  979.     if (!h->edge_emu_buffer) {

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

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

  982.         if (!h->edge_emu_buffer)

  983.             return AVERROR(ENOMEM);

  984.     }

  985. 

  986.     if ((ret = ff_cavs_init_pic(h)) < 0)

  987.         return ret;

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

  989. 

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

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

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

  993.     } else {

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

  995.     }

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

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

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

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

  1000.         h->sym_factor = h->dist[0] * h->scale_den[1];

  1001.     } else {

  1002.         h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;

  1003.         h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;

  1004.     }

  1005. 

  1006.     if (h->low_delay)

  1007.         get_ue_golomb(&h->gb); //bbv_check_times

  1008.     h->progressive   = get_bits1(&h->gb);

  1009.     h->pic_structure = 1;

  1010.     if (!h->progressive)

  1011.         h->pic_structure = get_bits1(&h->gb);

  1012.     if (!h->pic_structure && h->stc == PIC_PB_START_CODE)

  1013.         skip_bits1(&h->gb);     //advanced_pred_mode_disable

  1014.     skip_bits1(&h->gb);        //top_field_first

  1015.     skip_bits1(&h->gb);        //repeat_first_field

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

  1017.     h->qp       = get_bits(&h->gb, 6);

  1018.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1019.         if (!h->progressive && !h->pic_structure)

  1020.             skip_bits1(&h->gb);//what is this?

  1021.         skip_bits(&h->gb, 4);   //reserved bits

  1022.     } else {

  1023.         if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))

  1024.             h->ref_flag        = get_bits1(&h->gb);

  1025.         skip_bits(&h->gb, 4);   //reserved bits

  1026.         h->skip_mode_flag      = get_bits1(&h->gb);

  1027.     }

  1028.     h->loop_filter_disable     = get_bits1(&h->gb);

  1029.     if (!h->loop_filter_disable && get_bits1(&h->gb)) {

  1030.         h->alpha_offset        = get_se_golomb(&h->gb);

  1031.         h->beta_offset         = get_se_golomb(&h->gb);

  1032.     } else {

  1033.         h->alpha_offset = h->beta_offset  = 0;

  1034.     }

  1035.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1036.         do {

  1037.             check_for_slice(h);

  1038.             decode_mb_i(h, 0);

  1039.         } while (ff_cavs_next_mb(h));

  1040.     } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {

  1041.         do {

  1042.             if (check_for_slice(h))

  1043.                 skip_count = -1;

  1044.             if (h->skip_mode_flag && (skip_count < 0))

  1045.                 skip_count = get_ue_golomb(&h->gb);

  1046.             if (h->skip_mode_flag && skip_count--) {

  1047.                 decode_mb_p(h, P_SKIP);

  1048.             } else {

  1049.                 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;

  1050.                 if (mb_type > P_8X8)

  1051.                     decode_mb_i(h, mb_type - P_8X8 - 1);

  1052.                 else

  1053.                     decode_mb_p(h, mb_type);

  1054.             }

  1055.         } while (ff_cavs_next_mb(h));

  1056.     } else { /* AV_PICTURE_TYPE_B */

  1057.         do {

  1058.             if (check_for_slice(h))

  1059.                 skip_count = -1;

  1060.             if (h->skip_mode_flag && (skip_count < 0))

  1061.                 skip_count = get_ue_golomb(&h->gb);

  1062.             if (h->skip_mode_flag && skip_count--) {

  1063.                 decode_mb_b(h, B_SKIP);

  1064.             } else {

  1065.                 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;

  1066.                 if (mb_type > B_8X8)

  1067.                     decode_mb_i(h, mb_type - B_8X8 - 1);

  1068.                 else

  1069.                     decode_mb_b(h, mb_type);

  1070.             }

  1071.         } while (ff_cavs_next_mb(h));

  1072.     }

  1073.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1074.         if (h->DPB[1].f->data[0])

  1075.             h->avctx->release_buffer(h->avctx, h->DPB[1].f);

  1076.         FFSWAP(AVSFrame, h->cur, h->DPB[1]);

  1077.         FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);

  1078.     }

  1079.     return 0;

  1080. }

  1081. 

  1082. /*****************************************************************************

  1083.  *

  1084.  * headers and interface

  1085.  *

  1086.  ****************************************************************************/

  1087. 

  1088. static int decode_seq_header(AVSContext *h)

  1089. {

  1090.     int frame_rate_code;

  1091.     int width, height;

  1092. 

  1093.     h->profile = get_bits(&h->gb, 8);

  1094.     h->level   = get_bits(&h->gb, 8);

  1095.     skip_bits1(&h->gb); //progressive sequence

  1096. 

  1097.     width  = get_bits(&h->gb, 14);

  1098.     height = get_bits(&h->gb, 14);

  1099.     if ((h->width || h->height) && (h->width != width || h->height != height)) {

  1100.         av_log_missing_feature(h->avctx, "Width/height changing in CAVS", 0);

  1101.         return AVERROR_PATCHWELCOME;

  1102.     }

  1103.     if (width <= 0 || height <= 0) {

  1104.         av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");

  1105.         return AVERROR_INVALIDDATA;

  1106.     }

  1107.     h->width  = width;

  1108.     h->height = height;

  1109. 

  1110.     skip_bits(&h->gb, 2); //chroma format

  1111.     skip_bits(&h->gb, 3); //sample_precision

  1112.     h->aspect_ratio = get_bits(&h->gb, 4);

  1113.     frame_rate_code = get_bits(&h->gb, 4);

  1114.     skip_bits(&h->gb, 18); //bit_rate_lower

  1115.     skip_bits1(&h->gb);    //marker_bit

  1116.     skip_bits(&h->gb, 12); //bit_rate_upper

  1117.     h->low_delay =  get_bits1(&h->gb);

  1118.     h->mb_width  = (h->width  + 15) >> 4;

  1119.     h->mb_height = (h->height + 15) >> 4;

  1120.     h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;

  1121.     h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;

  1122.     h->avctx->width  = h->width;

  1123.     h->avctx->height = h->height;

  1124.     if (!h->top_qp)

  1125.         ff_cavs_init_top_lines(h);

  1126.     return 0;

  1127. }

  1128. 

  1129. static void cavs_flush(AVCodecContext * avctx)

  1130. {

  1131.     AVSContext *h = avctx->priv_data;

  1132.     h->got_keyframe = 0;

  1133. }

  1134. 

  1135. static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1136.                              AVPacket *avpkt)

  1137. {

  1138.     AVSContext *h      = avctx->priv_data;

  1139.     const uint8_t *buf = avpkt->data;

  1140.     int buf_size       = avpkt->size;

  1141.     AVFrame *picture   = data;

  1142.     uint32_t stc       = -1;

  1143.     int input_size;

  1144.     const uint8_t *buf_end;

  1145.     const uint8_t *buf_ptr;

  1146. 

  1147.     if (buf_size == 0) {

  1148.         if (!h->low_delay && h->DPB[0].f->data[0]) {

  1149.             *got_frame = 1;

  1150.             *picture = *h->DPB[0].f;

  1151.             if (h->cur.f->data[0])

  1152.                 avctx->release_buffer(avctx, h->cur.f);

  1153.             FFSWAP(AVSFrame, h->cur, h->DPB[0]);

  1154.         }

  1155.         return 0;

  1156.     }

  1157. 

  1158.     buf_ptr = buf;

  1159.     buf_end = buf + buf_size;

  1160.     for(;;) {

  1161.         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &stc);

  1162.         if ((stc & 0xFFFFFE00) || buf_ptr == buf_end)

  1163.             return FFMAX(0, buf_ptr - buf);

  1164.         input_size = (buf_end - buf_ptr) * 8;

  1165.         switch (stc) {

  1166.         case CAVS_START_CODE:

  1167.             init_get_bits(&h->gb, buf_ptr, input_size);

  1168.             decode_seq_header(h);

  1169.             break;

  1170.         case PIC_I_START_CODE:

  1171.             if (!h->got_keyframe) {

  1172.                 if(h->DPB[0].f->data[0])

  1173.                     avctx->release_buffer(avctx, h->DPB[0].f);

  1174.                 if(h->DPB[1].f->data[0])

  1175.                     avctx->release_buffer(avctx, h->DPB[1].f);

  1176.                 h->got_keyframe = 1;

  1177.             }

  1178.         case PIC_PB_START_CODE:

  1179.             *got_frame = 0;

  1180.             if (!h->got_keyframe)

  1181.                 break;

  1182.             if(!h->top_qp)

  1183.                 break;

  1184.             init_get_bits(&h->gb, buf_ptr, input_size);

  1185.             h->stc = stc;

  1186.             if (decode_pic(h))

  1187.                 break;

  1188.             *got_frame = 1;

  1189.             if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1190.                 if (h->DPB[1].f->data[0]) {

  1191.                     *picture = *h->DPB[1].f;

  1192.                 } else {

  1193.                     *got_frame = 0;

  1194.                 }

  1195.             } else

  1196.                 *picture = *h->cur.f;

  1197.             break;

  1198.         case EXT_START_CODE:

  1199.             //mpeg_decode_extension(avctx, buf_ptr, input_size);

  1200.             break;

  1201.         case USER_START_CODE:

  1202.             //mpeg_decode_user_data(avctx, buf_ptr, input_size);

  1203.             break;

  1204.         default:

  1205.             if (stc <= SLICE_MAX_START_CODE) {

  1206.                 init_get_bits(&h->gb, buf_ptr, input_size);

  1207.                 decode_slice_header(h, &h->gb);

  1208.             }

  1209.             break;

  1210.         }

  1211.     }

  1212. }

  1213. 

  1214. AVCodec ff_cavs_decoder = {

  1215.     .name           = "cavs",

  1216.     .type           = AVMEDIA_TYPE_VIDEO,

  1217.     .id             = AV_CODEC_ID_CAVS,

  1218.     .priv_data_size = sizeof(AVSContext),

  1219.     .init           = ff_cavs_init,

  1220.     .close          = ff_cavs_end,

  1221.     .decode         = cavs_decode_frame,

  1222.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1223.     .flush          = cavs_flush,

  1224.     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),

  1225. };