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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 dequant_shift[64] = {

  56.   14, 14, 14, 14, 14, 14, 14, 14,

  57.   13, 13, 13, 13, 13, 13, 13, 13,

  58.   13, 12, 12, 12, 12, 12, 12, 12,

  59.   11, 11, 11, 11, 11, 11, 11, 11,

  60.   11, 10, 10, 10, 10, 10, 10, 10,

  61.   10,  9,  9,  9,  9,  9,  9,  9,

  62.   9,   8,  8,  8,  8,  8,  8,  8,

  63.   7,   7,  7,  7,  7,  7,  7,  7

  64. };

  65. 

  66. static const uint16_t dequant_mul[64] = {

  67.   32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,

  68.   32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,

  69.   65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,

  70.   32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,

  71.   65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,

  72.   65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,

  73.   65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,

  74.   32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099

  75. };

  76. 

  77. #define EOB 0, 0, 0

  78. 

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

  80.     {

  81.         { //level / run / table_inc

  82.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3, 1 },

  83.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6, 1 },

  84.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9, 1 },

  85.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  2,  1,  2 }, { -2,  1, 2 },

  86.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14, 1 },

  87.             {  1, 15,  1 }, { -1, 15,  1 }, {  2,  2,  2 }, { -2,  2,  2 }, {  1, 16,  1 }, { -1, 16, 1 },

  88.             {  1, 17,  1 }, { -1, 17,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 18,  1 }, { -1, 18, 1 },

  89.             {  1, 19,  1 }, { -1, 19,  1 }, {  2,  3,  2 }, { -2,  3,  2 }, {  1, 20,  1 }, { -1, 20, 1 },

  90.             {  1, 21,  1 }, { -1, 21,  1 }, {  2,  4,  2 }, { -2,  4,  2 }, {  1, 22,  1 }, { -1, 22, 1 },

  91.             {  2,  5,  2 }, { -2,  5,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {   EOB    }

  92.         },

  93.         //level_add

  94.         { 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 },

  95.         2, //golomb_order

  96.         0, //inc_limit

  97.         23, //max_run

  98.     },

  99.     {

  100.         { //level / run

  101.             {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 }, { -2,  1,  1 },

  102.             {  1,  3,  0 }, { -1,  3,  0 }, {     EOB    }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  103.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  2,  2,  1 },

  104.             { -2,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  1,  9,  0 },

  105.             { -1,  9,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  4,  1,  2 }, { -4,  1,  2 }, {  1, 10,  0 },

  106.             { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  3,  2,  2 },

  107.             { -3,  2,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  5,  1,  3 },

  108.             { -5,  1,  3 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 14,  0 },

  109.             { -1, 14,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  2,  8,  1 }, { -2,  8,  1 }, {  3,  3,  2 },

  110.             { -3,  3,  2 }, {  6,  1,  3 }, { -6,  1,  3 }, {  1, 15,  0 }, { -1, 15,  0 }

  111.         },

  112.         //level_add

  113.         { 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 },

  114.         2, //golomb_order

  115.         1, //inc_limit

  116.         15, //max_run

  117.     },

  118.     {

  119.         { //level / run

  120.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 },

  121.             {  3,  1,  1 }, { -3,  1,  1 }, {     EOB    }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  122.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  123.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  124.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  2,  4,  0 },

  125.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  126.             { -7,  1,  2 }, {  3,  3,  1 }, { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 },

  127.             { -1,  8,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  3 }, { -8,  1,  3 }, {  1,  9,  0 },

  128.             { -1,  9,  0 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 }, {  2,  7,  0 },

  129.             { -2,  7,  0 }, {  9,  1,  3 }, { -9,  1,  3 }, {  1, 10,  0 }, { -1, 10,  0 }

  130.         },

  131.         //level_add

  132.         { 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 },

  133.         2, //golomb_order

  134.         2, //inc_limit

  135.         10, //max_run

  136.     },

  137.     {

  138.         { //level / run

  139.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

  140.             {  1,  2,  0 }, { -1,  2,  0 }, {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  1 },

  141.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  1 },

  142.             { -6,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  143.             { -1,  4,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  144.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  5,  2,  1 },

  145.             { -5,  2,  1 }, {  2,  4,  0 }, { -2,  4,  0 }, { 10,  1,  2 }, {-10,  1,  2 }, {  3,  3,  0 },

  146.             { -3,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 11,  1,  3 }, {-11,  1,  3 }, {  6,  2,  1 },

  147.             { -6,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  5,  0 }, { -2,  5,  0 }, {  3,  4,  0 },

  148.             { -3,  4,  0 }, { 12,  1,  3 }, {-12,  1,  3 }, {  4,  3,  0 }, { -4,  3,  0 }

  149.          },

  150.         //level_add

  151.         { 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 },

  152.         2, //golomb_order

  153.         4, //inc_limit

  154.         7, //max_run

  155.     },

  156.     {

  157.         { //level / run

  158.             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },

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

  160.             { -6,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  1 },

  161.             { -8,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, { 10,  1,  1 },

  162.             {-10,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 11,  1,  2 },

  163.             {-11,  1,  2 }, {  4,  2,  0 }, { -4,  2,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, { 13,  1,  2 },

  164.             {-13,  1,  2 }, {  5,  2,  0 }, { -5,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 },

  165.             { -2,  3,  0 }, { 14,  1,  2 }, {-14,  1,  2 }, {  6,  2,  0 }, { -6,  2,  0 }, { 15,  1,  2 },

  166.             {-15,  1,  2 }, { 16,  1,  2 }, {-16,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  5,  0 },

  167.             { -1,  5,  0 }, {  7,  2,  0 }, { -7,  2,  0 }, { 17,  1,  2 }, {-17,  1,  2 }

  168.         },

  169.         //level_add

  170.         { 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 },

  171.         2, //golomb_order

  172.         7, //inc_limit

  173.         5, //max_run

  174.     },

  175.     {

  176.         { //level / run

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

  178.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  179.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  180.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 11,  1,  1 },

  181.             {-11,  1,  1 }, { 12,  1,  1 }, {-12,  1,  1 }, { 13,  1,  1 }, {-13,  1,  1 }, {  2,  2,  0 },

  182.             { -2,  2,  0 }, { 14,  1,  1 }, {-14,  1,  1 }, { 15,  1,  1 }, {-15,  1,  1 }, {  3,  2,  0 },

  183.             { -3,  2,  0 }, { 16,  1,  1 }, {-16,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, { 17,  1,  1 },

  184.             {-17,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, { 18,  1,  1 }, {-18,  1,  1 }, {  5,  2,  0 },

  185.             { -5,  2,  0 }, { 19,  1,  1 }, {-19,  1,  1 }, { 20,  1,  1 }, {-20,  1,  1 }, {  6,  2,  0 },

  186.             { -6,  2,  0 }, { 21,  1,  1 }, {-21,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }

  187.         },

  188.         //level_add

  189.         { 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 },

  190.         2, //golomb_order

  191.         10, //inc_limit

  192.         3, //max_run

  193.     },

  194.     {

  195.         { //level / run

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

  197.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },

  198.             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },

  199.             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, { 11,  1,  0 }, {-11,  1,  0 }, { 12,  1,  0 },

  200.             {-12,  1,  0 }, { 13,  1,  0 }, {-13,  1,  0 }, { 14,  1,  0 }, {-14,  1,  0 }, { 15,  1,  0 },

  201.             {-15,  1,  0 }, { 16,  1,  0 }, {-16,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 17,  1,  0 },

  202.             {-17,  1,  0 }, { 18,  1,  0 }, {-18,  1,  0 }, { 19,  1,  0 }, {-19,  1,  0 }, { 20,  1,  0 },

  203.             {-20,  1,  0 }, { 21,  1,  0 }, {-21,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, { 22,  1,  0 },

  204.             {-22,  1,  0 }, { 23,  1,  0 }, {-23,  1,  0 }, { 24,  1,  0 }, {-24,  1,  0 }, { 25,  1,  0 },

  205.             {-25,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 26,  1,  0 }, {-26,  1,  0 }

  206.         },

  207.         //level_add

  208.         { 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 },

  209.         2, //golomb_order

  210.         INT_MAX, //inc_limit

  211.         2, //max_run

  212.     }

  213. };

  214. 

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

  216.     {

  217.         { //level / run

  218.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  219.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  220.             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9,  1 },

  221.             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  1, 12,  1 }, { -1, 12,  1 },

  222.             {  1, 13,  1 }, { -1, 13,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1, 14,  1 }, { -1, 14,  1 },

  223.             {  1, 15,  1 }, { -1, 15,  1 }, {  1, 16,  1 }, { -1, 16,  1 }, {  1, 17,  1 }, { -1, 17,  1 },

  224.             {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 }, {  3,  1,  3 }, { -3,  1,  3 },

  225.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  2,  2,  2 }, { -2,  2,  2 },

  226.             {  1, 22,  1 }, { -1, 22,  1 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  227.             {  1, 25,  1 }, { -1, 25,  1 }, {  1, 26,  1 }, { -1, 26,  1 }, {   EOB    }

  228.         },

  229.         //level_add

  230.         { 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 },

  231.         3, //golomb_order

  232.         0, //inc_limit

  233.         26 //max_run

  234.     },

  235.     {

  236.         { //level / run

  237.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  1,  3,  0 },

  238.             { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  239.             { -1,  6,  0 }, {  2,  1,  1 }, { -2,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 },

  240.             { -1,  8,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  2,  2,  1 },

  241.             { -2,  2,  1 }, {  1, 11,  0 }, { -1, 11,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  1,  2 },

  242.             { -3,  1,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 }, { -1, 14,  0 }, {  2,  3,  1 },

  243.             { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  1, 16,  0 },

  244.             { -1, 16,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  1, 17,  0 }, { -1, 17,  0 }, {  4,  1,  3 },

  245.             { -4,  1,  3 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 18,  0 }, { -1, 18,  0 }, {  1, 19,  0 },

  246.             { -1, 19,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  3,  2,  2 }, { -3,  2,  2 }

  247.         },

  248.         //level_add

  249.         { 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 },

  250.         2, //golomb_order

  251.         1, //inc_limit

  252.         19 //max_run

  253.     },

  254.     {

  255.         { //level / run

  256.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  0 },

  257.             { -2,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  3,  1,  1 },

  258.             { -3,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },

  259.             { -1,  6,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  1,  2 },

  260.             { -4,  1,  2 }, {  1,  8,  0 }, { -1,  8,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  4,  0 },

  261.             { -2,  4,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  5,  1,  2 },

  262.             { -5,  1,  2 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  6,  0 },

  263.             { -2,  6,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  3,  1 }, { -3,  3,  1 }, {  6,  1,  2 },

  264.             { -6,  1,  2 }, {  4,  2,  2 }, { -4,  2,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  7,  0 },

  265.             { -2,  7,  0 }, {  3,  4,  1 }, { -3,  4,  1 }, {  1, 14,  0 }, { -1, 14,  0 }

  266.         },

  267.         //level_add

  268.         { 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 },

  269.         2, //golomb_order

  270.         2, //inc_limit

  271.         14 //max_run

  272.     },

  273.     {

  274.         { //level / run

  275.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },

  276.             { -1,  2,  0 }, {  3,  1,  0 }, { -3,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },

  277.             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  1 },

  278.             { -5,  1,  1 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  2,  3,  0 },

  279.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  2,  4,  0 },

  280.             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },

  281.             { -7,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  5,  0 },

  282.             { -2,  5,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  4,  0 },

  283.             { -3,  4,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  1, 10,  0 },

  284.             { -1, 10,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  4,  3,  1 }, { -4,  3,  1 }

  285.         },

  286.         //level_add

  287.         { 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 },

  288.         2, //golomb_order

  289.         3, //inc_limit

  290.         10 //max_run

  291.     },

  292.     {

  293.         { //level / run

  294.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },

  295.             { -3,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 },

  296.             { -5,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  0 },

  297.             { -6,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },

  298.             { -1,  4,  0 }, {  8,  1,  1 }, { -8,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },

  299.             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, {  5,  2,  0 },

  300.             { -5,  2,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 10,  1,  2 },

  301.             {-10,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, { 11,  1,  2 }, {-11,  1,  2 }, {  1,  7,  0 },

  302.             { -1,  7,  0 }, {  6,  2,  0 }, { -6,  2,  0 }, {  3,  4,  0 }, { -3,  4,  0 }, {  2,  5,  0 },

  303.             { -2,  5,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, {  4,  3,  0 }, { -4,  3,  0 }

  304.         },

  305.         //level_add

  306.         { 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 },

  307.         2, //golomb_order

  308.         6, //inc_limit

  309.         7  //max_run

  310.     },

  311.     {

  312.         { //level / run

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

  314.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  1,  2,  0 },

  315.             {  -1,  2,  0 }, {  6,  1,  0 }, {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 },

  316.             {  -8,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, {  1,  3,  0 },

  317.             {  -1,  3,  0 }, { 10,  1,  1 }, { -10,  1,  1 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 11,  1,  1 },

  318.             { -11,  1,  1 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 12,  1,  1 }, { -12,  1,  1 }, {  1,  4,  0 },

  319.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 13,  1,  1 }, { -13,  1,  1 }, {  5,  2,  0 },

  320.             {  -5,  2,  0 }, { 14,  1,  1 }, { -14,  1,  1 }, {  6,  2,  0 }, {  -6,  2,  0 }, {  1,  5,  0 },

  321.             {  -1,  5,  0 }, { 15,  1,  1 }, { -15,  1,  1 }, {  3,  3,  0 }, {  -3,  3,  0 }, { 16,  1,  1 },

  322.             { -16,  1,  1 }, {  2,  4,  0 }, {  -2,  4,  0 }, {  7,  2,  0 }, {  -7,  2,  0 }

  323.         },

  324.         //level_add

  325.         { 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 },

  326.         2, //golomb_order

  327.         9, //inc_limit

  328.         5  //max_run

  329.     },

  330.     {

  331.         { //level / run

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

  333.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {   6,  1,  0 },

  334.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  1,  2,  0 }, {  -1,  2,  0 }, {   8,  1,  0 },

  335.             {  -8,  1,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, {  11,  1,  0 },

  336.             { -11,  1,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  13,  1,  0 },

  337.             { -13,  1,  0 }, {  1,  3,  0 }, {  -1,  3,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  15,  1,  0 },

  338.             { -15,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 16,  1,  0 }, { -16,  1,  0 }, {  17,  1,  0 },

  339.             { -17,  1,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, {  19,  1,  0 },

  340.             { -19,  1,  0 }, { 20,  1,  0 }, { -20,  1,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, {   1,  4,  0 },

  341.             {  -1,  4,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, { 21,  1,  0 }, { -21,  1,  0 }

  342.         },

  343.         //level_add

  344.         { 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 },

  345.         2, //golomb_order

  346.         INT_MAX, //inc_limit

  347.         4 //max_run

  348.     }

  349. };

  350. 

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

  352.     {

  353.         { //level / run

  354.             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },

  355.             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },

  356.             {  1,  7,  1 }, { -1,  7,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1,  8,  1 }, { -1,  8,  1 },

  357.             {  1,  9,  1 }, { -1,  9,  1 }, {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 },

  358.             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14,  1 },

  359.             {  1, 15,  1 }, { -1, 15,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 16,  1 }, { -1, 16,  1 },

  360.             {  1, 17,  1 }, { -1, 17,  1 }, {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 },

  361.             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  1, 22,  1 }, { -1, 22,  1 },

  362.             {  2,  2,  2 }, { -2,  2,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },

  363.             {  1, 25,  1 }, { -1, 25,  1 }, {  4,  1,  3 }, { -4,  1,  3 }, {   EOB    }

  364.         },

  365.         //level_add

  366.         { 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 },

  367.         2, //golomb_order

  368.         0, //inc_limit

  369.         25 //max_run

  370.     },

  371.     {

  372.         { //level / run

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

  374.             { -2,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },

  375.             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  1,  7,  0 },

  376.             { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  2,  1 }, { -2,  2,  1 }, {  1,  9,  0 },

  377.             { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  4,  1,  2 },

  378.             { -4,  1,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 },

  379.             { -1, 14,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 },

  380.             { -2,  4,  1 }, {  5,  1,  3 }, { -5,  1,  3 }, {  3,  2,  2 }, { -3,  2,  2 }, {  1, 16,  0 },

  381.             { -1, 16,  0 }, {  1, 17,  0 }, { -1, 17,  0 }, {  1, 18,  0 }, { -1, 18,  0 }, {  2,  5,  1 },

  382.             { -2,  5,  1 }, {  1, 19,  0 }, { -1, 19,  0 }, {  1, 20,  0 }, { -1, 20,  0 }

  383.         },

  384.         //level_add

  385.         { 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 },

  386.         0, //golomb_order

  387.         1, //inc_limit

  388.         20 //max_run

  389.     },

  390.     {

  391.         { //level / run

  392.             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },

  393.             { -1,  2,  0 }, {  3,  1,  1 }, { -3,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  4,  1,  1 },

  394.             { -4,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },

  395.             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },

  396.             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  1,  7,  0 },

  397.             { -1,  7,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  7,  1,  2 }, { -7,  1,  2 }, {  1,  8,  0 },

  398.             { -1,  8,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  3,  1 },

  399.             { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  2 },

  400.             { -8,  1,  2 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  9,  1,  2 },

  401.             { -9,  1,  2 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 },

  402.         },

  403.         //level_add

  404.         { 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 },

  405.         1, //golomb_order

  406.         2, //inc_limit

  407.         11 //max_run

  408.     },

  409.     {

  410.         { //level / run

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

  412.             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  5,  1,  1 },

  413.             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  1,  3,  0 },

  414.             { -1,  3,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  8,  1,  1 },

  415.             { -8,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  9,  1,  1 },

  416.             { -9,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, { 10,  1,  1 },

  417.             {-10,  1,  1 }, {  3,  3,  0 }, { -3,  3,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  2,  4,  0 },

  418.             { -2,  4,  0 }, { 11,  1,  1 }, {-11,  1,  1 }, {  1,  6,  0 }, { -1,  6,  0 }, { 12,  1,  1 },

  419.             {-12,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  6,  2,  1 }, { -6,  2,  1 }, { 13,  1,  1 },

  420.             {-13,  1,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 }, { -1,  8,  0 },

  421.         },

  422.         //level_add

  423.         { 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 },

  424.         1, //golomb_order

  425.         4, //inc_limit

  426.         8  //max_run

  427.     },

  428.     {

  429.         { //level / run

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

  431.             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  6,  1,  0 },

  432.             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 }, {  -8,  1,  0 }, {  1,  2,  0 },

  433.             {  -1,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, { 11,  1,  0 },

  434.             { -11,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, { 13,  1,  0 },

  435.             { -13,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  1,  3,  0 },

  436.             {  -1,  3,  0 }, { 15,  1,  0 }, { -15,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 16,  1,  0 },

  437.             { -16,  1,  0 }, { 17,  1,  0 }, { -17,  1,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, {  1,  4,  0 },

  438.             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  6,  2,  0 },

  439.             {  -6,  2,  0 }, { 19,  1,  0 }, { -19,  1,  0 }, {  1,  5,  0 }, {  -1,  5,  0 },

  440.         },

  441.         //level_add

  442.         { 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 },

  443.         0, //golomb_order

  444.         INT_MAX, //inc_limit

  445.         5, //max_run

  446.     }

  447. };

  448. 

  449. #undef EOB

  450. 

  451. /*****************************************************************************

  452.  *

  453.  * motion vector prediction

  454.  *

  455.  ****************************************************************************/

  456. 

  457. static inline void store_mvs(AVSContext *h)

  458. {

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

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

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

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

  463. }

  464. 

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

  466.                                   cavs_vector *col_mv)

  467. {

  468.     cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

  470.     int m = FF_SIGNBIT(col_mv->x);

  471. 

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

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

  474.     pmv_fw->ref = 1;

  475.     pmv_bw->ref = 0;

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

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

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

  479.     m = FF_SIGNBIT(col_mv->y);

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

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

  482. }

  483. 

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

  485.                                enum cavs_block size)

  486. {

  487.     cavs_vector *dst = src + MV_BWD_OFFS;

  488. 

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

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

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

  492.     dst->ref = 0;

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

  494.     set_mvs(dst, size);

  495. }

  496. 

  497. /*****************************************************************************

  498.  *

  499.  * residual data decoding

  500.  *

  501.  ****************************************************************************/

  502. 

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

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

  505. {

  506.     unsigned ret = get_ue_golomb(gb);

  507.     if (ret >= ((1U<<31)>>order)) {

  508.         av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");

  509.         return AVERROR_INVALIDDATA;

  510.     }

  511.     if (order) {

  512.         return (ret<<order) + get_bits(gb, order);

  513.     }

  514.     return ret;

  515. }

  516. 

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

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

  519. {

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

  521.     int pos = -1;

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

  523. 

  524.     /* inverse scan and dequantization */

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

  526.         pos += run_buf[coeff_num];

  527.         if (pos > 63) {

  528.             av_log(h->avctx, AV_LOG_ERROR,

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

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

  531.             return AVERROR_INVALIDDATA;

  532.         }

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

  534.     }

  535.     return 0;

  536. }

  537. 

  538. /**

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

  540.  *  and add them to sample block

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

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

  543.  * @param qp quantizer

  544.  * @param dst location of sample block

  545.  * @param stride line stride in frame buffer

  546.  */

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

  548.                                  const struct dec_2dvlc *r, int esc_golomb_order,

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

  550. {

  551.     int i, esc_code, level, mask, ret;

  552.     unsigned int level_code, run;

  553.     int16_t level_buf[65];

  554.     uint8_t run_buf[65];

  555.     int16_t *block = h->block;

  556. 

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

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

  559.         if (level_code >= ESCAPE_CODE) {

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

  561.             if(run > 64) {

  562.                 av_log(h->avctx, AV_LOG_ERROR, "run %d is too large\n", run);

  563.                 return AVERROR_INVALIDDATA;

  564.             }

  565.             esc_code = get_ue_code(gb, esc_golomb_order);

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

  567.             while (level > r->inc_limit)

  568.                 r++;

  569.             mask  = -(level_code & 1);

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

  571.         } else {

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

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

  574.                 break;

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

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

  577.         }

  578.         level_buf[i] = level;

  579.         run_buf[i]   = run;

  580.     }

  581.     if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],

  582.                       dequant_shift[qp], i)) < 0)

  583.         return ret;

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

  585.     h->bdsp.clear_block(block);

  586.     return 0;

  587. }

  588. 

  589. 

  590. static inline void decode_residual_chroma(AVSContext *h)

  591. {

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

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

  594.                               ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);

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

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

  597.                               ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);

  598. }

  599. 

  600. static inline int decode_residual_inter(AVSContext *h)

  601. {

  602.     int block;

  603. 

  604.     /* get coded block pattern */

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

  606.     if (cbp > 63U) {

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

  608.         return AVERROR_INVALIDDATA;

  609.     }

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

  611. 

  612.     /* get quantizer */

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

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

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

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

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

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

  619.     decode_residual_chroma(h);

  620. 

  621.     return 0;

  622. }

  623. 

  624. /*****************************************************************************

  625.  *

  626.  * macroblock level

  627.  *

  628.  ****************************************************************************/

  629. 

  630. static inline void set_mv_intra(AVSContext *h)

  631. {

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

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

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

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

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

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

  638. }

  639. 

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

  641. {

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

  643.     unsigned pred_mode_uv;

  644.     int block;

  645.     uint8_t top[18];

  646.     uint8_t *left = NULL;

  647.     uint8_t *d;

  648. 

  649.     ff_cavs_init_mb(h);

  650. 

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

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

  653.         int nA, nB, predpred;

  654.         int pos = scan3x3[block];

  655. 

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

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

  658.         predpred = FFMIN(nA, nB);

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

  660.             predpred = INTRA_L_LP;

  661.         if (!get_bits1(gb)) {

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

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

  664.         }

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

  666.     }

  667.     pred_mode_uv = get_ue_golomb(gb);

  668.     if (pred_mode_uv > 6) {

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

  670.         return AVERROR_INVALIDDATA;

  671.     }

  672.     ff_cavs_modify_mb_i(h, &pred_mode_uv);

  673. 

  674.     /* get coded block pattern */

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

  676.         cbp_code = get_ue_golomb(gb);

  677.     if (cbp_code > 63U) {

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

  679.         return AVERROR_INVALIDDATA;

  680.     }

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

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

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

  684. 

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

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

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

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

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

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

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

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

  693.     }

  694. 

  695.     /* chroma intra prediction */

  696.     ff_cavs_load_intra_pred_chroma(h);

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

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

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

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

  701. 

  702.     decode_residual_chroma(h);

  703.     ff_cavs_filter(h, I_8X8);

  704.     set_mv_intra(h);

  705.     return 0;

  706. }

  707. 

  708. static inline void set_intra_mode_default(AVSContext *h)

  709. {

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

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

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

  713.     } else {

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

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

  716.     }

  717. }

  718. 

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

  720. {

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

  722.     int ref[4];

  723. 

  724.     ff_cavs_init_mb(h);

  725.     switch (mb_type) {

  726.     case P_SKIP:

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

  728.         break;

  729.     case P_16X16:

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

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

  732.         break;

  733.     case P_16X8:

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

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

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

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

  738.         break;

  739.     case P_8X16:

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

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

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

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

  744.         break;

  745.     case P_8X8:

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

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

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

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

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

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

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

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

  754.     }

  755.     ff_cavs_inter(h, mb_type);

  756.     set_intra_mode_default(h);

  757.     store_mvs(h);

  758.     if (mb_type != P_SKIP)

  759.         decode_residual_inter(h);

  760.     ff_cavs_filter(h, mb_type);

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

  762. }

  763. 

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

  765. {

  766.     int block;

  767.     enum cavs_sub_mb sub_type[4];

  768.     int flags;

  769. 

  770.     ff_cavs_init_mb(h);

  771. 

  772.     /* reset all MVs */

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

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

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

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

  777.     switch (mb_type) {

  778.     case B_SKIP:

  779.     case B_DIRECT:

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

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

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

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

  784.         } else

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

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

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

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

  789.         break;

  790.     case B_FWD_16X16:

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

  792.         break;

  793.     case B_SYM_16X16:

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

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

  796.         break;

  797.     case B_BWD_16X16:

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

  799.         break;

  800.     case B_8X8:

  801. #define TMP_UNUSED_INX  7

  802.         flags = 0;

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

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

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

  806.             switch (sub_type[block]) {

  807.             case B_SUB_DIRECT:

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

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

  810.                     if(flags==0) {

  811.                         // if col-MB is a Intra MB, current Block size is 16x16.

  812.                         // AVS standard section 9.9.1

  813.                         if(block>0){

  814.                             h->mv[TMP_UNUSED_INX              ] = h->mv[MV_FWD_X0              ];

  815.                             h->mv[TMP_UNUSED_INX + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];

  816.                         }

  817.                         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2,

  818.                                    MV_PRED_BSKIP, BLK_8X8, 1);

  819.                         ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,

  820.                                    MV_FWD_C2+MV_BWD_OFFS,

  821.                                    MV_PRED_BSKIP, BLK_8X8, 0);

  822.                         if(block>0) {

  823.                             flags = mv_scan[block];

  824.                             h->mv[flags              ] = h->mv[MV_FWD_X0              ];

  825.                             h->mv[flags + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];

  826.                             h->mv[MV_FWD_X0              ] = h->mv[TMP_UNUSED_INX              ];

  827.                             h->mv[MV_FWD_X0 + MV_BWD_OFFS] = h->mv[TMP_UNUSED_INX + MV_BWD_OFFS];

  828.                         } else

  829.                             flags = MV_FWD_X0;

  830.                     } else {

  831.                         h->mv[mv_scan[block]              ] = h->mv[flags              ];

  832.                         h->mv[mv_scan[block] + MV_BWD_OFFS] = h->mv[flags + MV_BWD_OFFS];

  833.                     }

  834.                 } else

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

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

  837.                 break;

  838.             case B_SUB_FWD:

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

  840.                            MV_PRED_MEDIAN, BLK_8X8, 1);

  841.                 break;

  842.             case B_SUB_SYM:

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

  844.                            MV_PRED_MEDIAN, BLK_8X8, 1);

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

  846.                 break;

  847.             }

  848.         }

  849. #undef TMP_UNUSED_INX

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

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

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

  853.                            mv_scan[block] + MV_BWD_OFFS - 3,

  854.                            MV_PRED_MEDIAN, BLK_8X8, 0);

  855.         }

  856.         break;

  857.     default:

  858.         if (mb_type <= B_SYM_16X16) {

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

  860.             return AVERROR_INVALIDDATA;

  861.         }

  862.         av_assert2(mb_type < B_8X8);

  863.         flags = ff_cavs_partition_flags[mb_type];

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

  865.             if (flags & FWD0)

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

  867.             if (flags & SYM0)

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

  869.             if (flags & FWD1)

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

  871.             if (flags & SYM1)

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

  873.             if (flags & BWD0)

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

  875.             if (flags & BWD1)

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

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

  878.             if (flags & FWD0)

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

  880.             if (flags & SYM0)

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

  882.             if (flags & FWD1)

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

  884.             if (flags & SYM1)

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

  886.             if (flags & BWD0)

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

  888.             if (flags & BWD1)

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

  890.         }

  891.     }

  892.     ff_cavs_inter(h, mb_type);

  893.     set_intra_mode_default(h);

  894.     if (mb_type != B_SKIP)

  895.         decode_residual_inter(h);

  896.     ff_cavs_filter(h, mb_type);

  897. 

  898.     return 0;

  899. }

  900. 

  901. /*****************************************************************************

  902.  *

  903.  * slice level

  904.  *

  905.  ****************************************************************************/

  906. 

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

  908. {

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

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

  911. 

  912.     if (h->stc >= h->mb_height) {

  913.         av_log(h->avctx, AV_LOG_ERROR, "stc 0x%02x is too large\n", h->stc);

  914.         return AVERROR_INVALIDDATA;

  915.     }

  916. 

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

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

  919. 

  920.     /* mark top macroblocks as unavailable */

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

  922.     if (!h->pic_qp_fixed) {

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

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

  925.     }

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

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

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

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

  930.             av_log(h->avctx, AV_LOG_ERROR,

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

  932.         }

  933.     return 0;

  934. }

  935. 

  936. static inline int check_for_slice(AVSContext *h)

  937. {

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

  939.     int align;

  940. 

  941.     if (h->mbx)

  942.         return 0;

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

  944.     /* check for stuffing byte */

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

  946.         align = 8;

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

  948.         skip_bits_long(gb, 24 + align);

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

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

  951.             return 0;

  952.         decode_slice_header(h, gb);

  953.         return 1;

  954.     }

  955.     return 0;

  956. }

  957. 

  958. /*****************************************************************************

  959.  *

  960.  * frame level

  961.  *

  962.  ****************************************************************************/

  963. 

  964. static int decode_pic(AVSContext *h)

  965. {

  966.     int ret;

  967.     int skip_count    = -1;

  968.     enum cavs_mb mb_type;

  969. 

  970.     if (!h->top_qp) {

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

  972.         return AVERROR_INVALIDDATA;

  973.     }

  974. 

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

  976. 

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

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

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

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

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

  982.             return AVERROR_INVALIDDATA;

  983.         }

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

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

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

  987.             return AVERROR_INVALIDDATA;

  988.     } else {

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

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

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

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

  993.            bump stream revision if detected otherwise */

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

  995.             h->stream_revision = 1;

  996.         /* similarly test top_field_first and repeat_first_field */

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

  998.             h->stream_revision = 1;

  999.         if (h->stream_revision > 0)

  1000.             skip_bits(&h->gb, 1); //marker_bit

  1001.     }

  1002. 

  1003.     ret = ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?

  1004.                         0 : AV_GET_BUFFER_FLAG_REF);

  1005.     if (ret < 0)

  1006.         return ret;

  1007. 

  1008.     if (!h->edge_emu_buffer) {

  1009.         int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);

  1010.         h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);

  1011.         if (!h->edge_emu_buffer)

  1012.             return AVERROR(ENOMEM);

  1013.     }

  1014. 

  1015.     if ((ret = ff_cavs_init_pic(h)) < 0)

  1016.         return ret;

  1017.     h->cur.poc = get_bits(&h->gb, 8) * 2;

  1018. 

  1019.     /* get temporal distances and MV scaling factors */

  1020.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1021.         h->dist[0] = (h->cur.poc - h->DPB[0].poc) & 511;

  1022.     } else {

  1023.         h->dist[0] = (h->DPB[0].poc  - h->cur.poc) & 511;

  1024.     }

  1025.     h->dist[1] = (h->cur.poc - h->DPB[1].poc) & 511;

  1026.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1027.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1028.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {

  1029.         h->sym_factor = h->dist[0] * h->scale_den[1];

  1030.     } else {

  1031.         h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;

  1032.         h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;

  1033.     }

  1034. 

  1035.     if (h->low_delay)

  1036.         get_ue_golomb(&h->gb); //bbv_check_times

  1037.     h->progressive   = get_bits1(&h->gb);

  1038.     h->pic_structure = 1;

  1039.     if (!h->progressive)

  1040.         h->pic_structure = get_bits1(&h->gb);

  1041.     if (!h->pic_structure && h->stc == PIC_PB_START_CODE)

  1042.         skip_bits1(&h->gb);     //advanced_pred_mode_disable

  1043.     skip_bits1(&h->gb);        //top_field_first

  1044.     skip_bits1(&h->gb);        //repeat_first_field

  1045.     h->pic_qp_fixed =

  1046.     h->qp_fixed = get_bits1(&h->gb);

  1047.     h->qp       = get_bits(&h->gb, 6);

  1048.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1049.         if (!h->progressive && !h->pic_structure)

  1050.             skip_bits1(&h->gb);//what is this?

  1051.         skip_bits(&h->gb, 4);   //reserved bits

  1052.     } else {

  1053.         if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))

  1054.             h->ref_flag        = get_bits1(&h->gb);

  1055.         skip_bits(&h->gb, 4);   //reserved bits

  1056.         h->skip_mode_flag      = get_bits1(&h->gb);

  1057.     }

  1058.     h->loop_filter_disable     = get_bits1(&h->gb);

  1059.     if (!h->loop_filter_disable && get_bits1(&h->gb)) {

  1060.         h->alpha_offset        = get_se_golomb(&h->gb);

  1061.         h->beta_offset         = get_se_golomb(&h->gb);

  1062.     } else {

  1063.         h->alpha_offset = h->beta_offset  = 0;

  1064.     }

  1065.     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {

  1066.         do {

  1067.             check_for_slice(h);

  1068.             decode_mb_i(h, 0);

  1069.         } while (ff_cavs_next_mb(h));

  1070.     } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {

  1071.         do {

  1072.             if (check_for_slice(h))

  1073.                 skip_count = -1;

  1074.             if (h->skip_mode_flag && (skip_count < 0))

  1075.                 skip_count = get_ue_golomb(&h->gb);

  1076.             if (h->skip_mode_flag && skip_count--) {

  1077.                 decode_mb_p(h, P_SKIP);

  1078.             } else {

  1079.                 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;

  1080.                 if (mb_type > P_8X8)

  1081.                     decode_mb_i(h, mb_type - P_8X8 - 1);

  1082.                 else

  1083.                     decode_mb_p(h, mb_type);

  1084.             }

  1085.         } while (ff_cavs_next_mb(h));

  1086.     } else { /* AV_PICTURE_TYPE_B */

  1087.         do {

  1088.             if (check_for_slice(h))

  1089.                 skip_count = -1;

  1090.             if (h->skip_mode_flag && (skip_count < 0))

  1091.                 skip_count = get_ue_golomb(&h->gb);

  1092.             if (h->skip_mode_flag && skip_count--) {

  1093.                 decode_mb_b(h, B_SKIP);

  1094.             } else {

  1095.                 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;

  1096.                 if (mb_type > B_8X8)

  1097.                     decode_mb_i(h, mb_type - B_8X8 - 1);

  1098.                 else

  1099.                     decode_mb_b(h, mb_type);

  1100.             }

  1101.         } while (ff_cavs_next_mb(h));

  1102.     }

  1103.     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1104.         av_frame_unref(h->DPB[1].f);

  1105.         FFSWAP(AVSFrame, h->cur, h->DPB[1]);

  1106.         FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);

  1107.     }

  1108.     return 0;

  1109. }

  1110. 

  1111. /*****************************************************************************

  1112.  *

  1113.  * headers and interface

  1114.  *

  1115.  ****************************************************************************/

  1116. 

  1117. static int decode_seq_header(AVSContext *h)

  1118. {

  1119.     int frame_rate_code;

  1120.     int width, height;

  1121. 

  1122.     h->profile = get_bits(&h->gb, 8);

  1123.     h->level   = get_bits(&h->gb, 8);

  1124.     skip_bits1(&h->gb); //progressive sequence

  1125. 

  1126.     width  = get_bits(&h->gb, 14);

  1127.     height = get_bits(&h->gb, 14);

  1128.     if ((h->width || h->height) && (h->width != width || h->height != height)) {

  1129.         avpriv_report_missing_feature(h->avctx,

  1130.                                       "Width/height changing in CAVS");

  1131.         return AVERROR_PATCHWELCOME;

  1132.     }

  1133.     if (width <= 0 || height <= 0) {

  1134.         av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");

  1135.         return AVERROR_INVALIDDATA;

  1136.     }

  1137.     h->width  = width;

  1138.     h->height = height;

  1139. 

  1140.     skip_bits(&h->gb, 2); //chroma format

  1141.     skip_bits(&h->gb, 3); //sample_precision

  1142.     h->aspect_ratio = get_bits(&h->gb, 4);

  1143.     frame_rate_code = get_bits(&h->gb, 4);

  1144.     skip_bits(&h->gb, 18); //bit_rate_lower

  1145.     skip_bits1(&h->gb);    //marker_bit

  1146.     skip_bits(&h->gb, 12); //bit_rate_upper

  1147.     h->low_delay =  get_bits1(&h->gb);

  1148.     h->mb_width  = (h->width  + 15) >> 4;

  1149.     h->mb_height = (h->height + 15) >> 4;

  1150.     h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];

  1151.     h->avctx->width  = h->width;

  1152.     h->avctx->height = h->height;

  1153.     if (!h->top_qp)

  1154.         ff_cavs_init_top_lines(h);

  1155.     return 0;

  1156. }

  1157. 

  1158. static void cavs_flush(AVCodecContext * avctx)

  1159. {

  1160.     AVSContext *h = avctx->priv_data;

  1161.     h->got_keyframe = 0;

  1162. }

  1163. 

  1164. static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1165.                              AVPacket *avpkt)

  1166. {

  1167.     AVSContext *h      = avctx->priv_data;

  1168.     const uint8_t *buf = avpkt->data;

  1169.     int buf_size       = avpkt->size;

  1170.     uint32_t stc       = -1;

  1171.     int input_size, ret;

  1172.     const uint8_t *buf_end;

  1173.     const uint8_t *buf_ptr;

  1174. 

  1175.     if (buf_size == 0) {

  1176.         if (!h->low_delay && h->DPB[0].f->data[0]) {

  1177.             *got_frame = 1;

  1178.             av_frame_move_ref(data, h->DPB[0].f);

  1179.         }

  1180.         return 0;

  1181.     }

  1182. 

  1183.     h->stc = 0;

  1184. 

  1185.     buf_ptr = buf;

  1186.     buf_end = buf + buf_size;

  1187.     for(;;) {

  1188.         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);

  1189.         if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) {

  1190.             if (!h->stc)

  1191.                 av_log(h->avctx, AV_LOG_WARNING, "no frame decoded\n");

  1192.             return FFMAX(0, buf_ptr - buf);

  1193.         }

  1194.         input_size = (buf_end - buf_ptr) * 8;

  1195.         switch (stc) {

  1196.         case CAVS_START_CODE:

  1197.             init_get_bits(&h->gb, buf_ptr, input_size);

  1198.             decode_seq_header(h);

  1199.             break;

  1200.         case PIC_I_START_CODE:

  1201.             if (!h->got_keyframe) {

  1202.                 av_frame_unref(h->DPB[0].f);

  1203.                 av_frame_unref(h->DPB[1].f);

  1204.                 h->got_keyframe = 1;

  1205.             }

  1206.         case PIC_PB_START_CODE:

  1207.             *got_frame = 0;

  1208.             if (!h->got_keyframe)

  1209.                 break;

  1210.             init_get_bits(&h->gb, buf_ptr, input_size);

  1211.             h->stc = stc;

  1212.             if (decode_pic(h))

  1213.                 break;

  1214.             *got_frame = 1;

  1215.             if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {

  1216.                 if (h->DPB[!h->low_delay].f->data[0]) {

  1217.                     if ((ret = av_frame_ref(data, h->DPB[!h->low_delay].f)) < 0)

  1218.                         return ret;

  1219.                 } else {

  1220.                     *got_frame = 0;

  1221.                 }

  1222.             } else {

  1223.                 av_frame_move_ref(data, h->cur.f);

  1224.             }

  1225.             break;

  1226.         case EXT_START_CODE:

  1227.             //mpeg_decode_extension(avctx, buf_ptr, input_size);

  1228.             break;

  1229.         case USER_START_CODE:

  1230.             //mpeg_decode_user_data(avctx, buf_ptr, input_size);

  1231.             break;

  1232.         default:

  1233.             if (stc <= SLICE_MAX_START_CODE) {

  1234.                 init_get_bits(&h->gb, buf_ptr, input_size);

  1235.                 decode_slice_header(h, &h->gb);

  1236.             }

  1237.             break;

  1238.         }

  1239.     }

  1240. }

  1241. 

  1242. AVCodec ff_cavs_decoder = {

  1243.     .name           = "cavs",

  1244.     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),

  1245.     .type           = AVMEDIA_TYPE_VIDEO,

  1246.     .id             = AV_CODEC_ID_CAVS,

  1247.     .priv_data_size = sizeof(AVSContext),

  1248.     .init           = ff_cavs_init,

  1249.     .close          = ff_cavs_end,

  1250.     .decode         = cavs_decode_frame,

  1251.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1252.     .flush          = cavs_flush,

  1253. };