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FFmpeg/libavcodec/cavsdec.c

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  1. /*

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

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

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

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

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "golomb.h"

  31. #include "cavs.h"

  32. 

  33. static const uint8_t mv_scan[4] = {

  34.     MV_FWD_X0,MV_FWD_X1,

  35.     MV_FWD_X2,MV_FWD_X3

  36. };

  37. 

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

  39.   {63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13},

  40.   { 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3},

  41.   { 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62},

  42.   {45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6},

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

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

  45.   {18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49},

  46.   {34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38}

  47. };

  48. 

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

  50. 

  51. static const uint8_t cavs_chroma_qp[64] = {

  52.   0,  1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,

  53.   16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,

  54.   32,33,34,35,36,37,38,39,40,41,42,42,43,43,44,44,

  55.   45,45,46,46,47,47,48,48,48,49,49,49,50,50,50,51

  56. };

  57. 

  58. static const uint8_t dequant_shift[64] = {

  59.   14,14,14,14,14,14,14,14,

  60.   13,13,13,13,13,13,13,13,

  61.   13,12,12,12,12,12,12,12,

  62.   11,11,11,11,11,11,11,11,

  63.   11,10,10,10,10,10,10,10,

  64.   10, 9, 9, 9, 9, 9, 9, 9,

  65.   9, 8, 8, 8, 8, 8, 8, 8,

  66.   7, 7, 7, 7, 7, 7, 7, 7

  67. };

  68. 

  69. static const uint16_t dequant_mul[64] = {

  70.   32768,36061,38968,42495,46341,50535,55437,60424,

  71.   32932,35734,38968,42495,46177,50535,55109,59933,

  72.   65535,35734,38968,42577,46341,50617,55027,60097,

  73.   32809,35734,38968,42454,46382,50576,55109,60056,

  74.   65535,35734,38968,42495,46320,50515,55109,60076,

  75.   65535,35744,38968,42495,46341,50535,55099,60087,

  76.   65535,35734,38973,42500,46341,50535,55109,60097,

  77.   32771,35734,38965,42497,46341,50535,55109,60099

  78. };

  79. 

  80. #define EOB 0,0,0

  81. 

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

  83.   {

  84.     { //level / run / table_inc

  85.       {  1, 1, 1},{ -1, 1, 1},{  1, 2, 1},{ -1, 2, 1},{  1, 3, 1},{ -1, 3, 1},

  86.       {  1, 4, 1},{ -1, 4, 1},{  1, 5, 1},{ -1, 5, 1},{  1, 6, 1},{ -1, 6, 1},

  87.       {  1, 7, 1},{ -1, 7, 1},{  1, 8, 1},{ -1, 8, 1},{  1, 9, 1},{ -1, 9, 1},

  88.       {  1,10, 1},{ -1,10, 1},{  1,11, 1},{ -1,11, 1},{  2, 1, 2},{ -2, 1, 2},

  89.       {  1,12, 1},{ -1,12, 1},{  1,13, 1},{ -1,13, 1},{  1,14, 1},{ -1,14, 1},

  90.       {  1,15, 1},{ -1,15, 1},{  2, 2, 2},{ -2, 2, 2},{  1,16, 1},{ -1,16, 1},

  91.       {  1,17, 1},{ -1,17, 1},{  3, 1, 3},{ -3, 1, 3},{  1,18, 1},{ -1,18, 1},

  92.       {  1,19, 1},{ -1,19, 1},{  2, 3, 2},{ -2, 3, 2},{  1,20, 1},{ -1,20, 1},

  93.       {  1,21, 1},{ -1,21, 1},{  2, 4, 2},{ -2, 4, 2},{  1,22, 1},{ -1,22, 1},

  94.       {  2, 5, 2},{ -2, 5, 2},{  1,23, 1},{ -1,23, 1},{   EOB   }

  95.     },

  96.     //level_add

  97.     { 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  98.       2, 2, 2, 2, 2, 2, 2,-1,-1,-1},

  99.     2, //golomb_order

  100.     0, //inc_limit

  101.     23, //max_run

  102.   },{

  103.     { //level / run

  104.       {  1, 1, 0},{ -1, 1, 0},{  1, 2, 0},{ -1, 2, 0},{  2, 1, 1},{ -2, 1, 1},

  105.       {  1, 3, 0},{ -1, 3, 0},{   EOB   },{  1, 4, 0},{ -1, 4, 0},{  1, 5, 0},

  106.       { -1, 5, 0},{  1, 6, 0},{ -1, 6, 0},{  3, 1, 2},{ -3, 1, 2},{  2, 2, 1},

  107.       { -2, 2, 1},{  1, 7, 0},{ -1, 7, 0},{  1, 8, 0},{ -1, 8, 0},{  1, 9, 0},

  108.       { -1, 9, 0},{  2, 3, 1},{ -2, 3, 1},{  4, 1, 2},{ -4, 1, 2},{  1,10, 0},

  109.       { -1,10, 0},{  1,11, 0},{ -1,11, 0},{  2, 4, 1},{ -2, 4, 1},{  3, 2, 2},

  110.       { -3, 2, 2},{  1,12, 0},{ -1,12, 0},{  2, 5, 1},{ -2, 5, 1},{  5, 1, 3},

  111.       { -5, 1, 3},{  1,13, 0},{ -1,13, 0},{  2, 6, 1},{ -2, 6, 1},{  1,14, 0},

  112.       { -1,14, 0},{  2, 7, 1},{ -2, 7, 1},{  2, 8, 1},{ -2, 8, 1},{  3, 3, 2},

  113.       { -3, 3, 2},{  6, 1, 3},{ -6, 1, 3},{  1,15, 0},{ -1,15, 0}

  114.     },

  115.     //level_add

  116.     { 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2,-1,

  117.       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  118.     2, //golomb_order

  119.     1, //inc_limit

  120.     15, //max_run

  121.   },{

  122.     { //level / run

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

  124.       {  3, 1, 1},{ -3, 1, 1},{   EOB   },{  1, 3, 0},{ -1, 3, 0},{  2, 2, 0},

  125.       { -2, 2, 0},{  4, 1, 1},{ -4, 1, 1},{  1, 4, 0},{ -1, 4, 0},{  5, 1, 2},

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

  127.       { -2, 3, 0},{  1, 6, 0},{ -1, 6, 0},{  6, 1, 2},{ -6, 1, 2},{  2, 4, 0},

  128.       { -2, 4, 0},{  1, 7, 0},{ -1, 7, 0},{  4, 2, 1},{ -4, 2, 1},{  7, 1, 2},

  129.       { -7, 1, 2},{  3, 3, 1},{ -3, 3, 1},{  2, 5, 0},{ -2, 5, 0},{  1, 8, 0},

  130.       { -1, 8, 0},{  2, 6, 0},{ -2, 6, 0},{  8, 1, 3},{ -8, 1, 3},{  1, 9, 0},

  131.       { -1, 9, 0},{  5, 2, 2},{ -5, 2, 2},{  3, 4, 1},{ -3, 4, 1},{  2, 7, 0},

  132.       { -2, 7, 0},{  9, 1, 3},{ -9, 1, 3},{  1,10, 0},{ -1,10, 0}

  133.     },

  134.     //level_add

  135.     { 0,10, 6, 4, 4, 3, 3, 3, 2, 2, 2,-1,-1,-1,-1,-1,-1,

  136.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  137.     2, //golomb_order

  138.     2, //inc_limit

  139.     10, //max_run

  140.   },{

  141.     { //level / run

  142.       {  1, 1, 0},{ -1, 1, 0},{  2, 1, 0},{ -2, 1, 0},{  3, 1, 0},{ -3, 1, 0},

  143.       {  1, 2, 0},{ -1, 2, 0},{   EOB   },{  4, 1, 0},{ -4, 1, 0},{  5, 1, 1},

  144.       { -5, 1, 1},{  2, 2, 0},{ -2, 2, 0},{  1, 3, 0},{ -1, 3, 0},{  6, 1, 1},

  145.       { -6, 1, 1},{  3, 2, 0},{ -3, 2, 0},{  7, 1, 1},{ -7, 1, 1},{  1, 4, 0},

  146.       { -1, 4, 0},{  8, 1, 2},{ -8, 1, 2},{  2, 3, 0},{ -2, 3, 0},{  4, 2, 0},

  147.       { -4, 2, 0},{  1, 5, 0},{ -1, 5, 0},{  9, 1, 2},{ -9, 1, 2},{  5, 2, 1},

  148.       { -5, 2, 1},{  2, 4, 0},{ -2, 4, 0},{ 10, 1, 2},{-10, 1, 2},{  3, 3, 0},

  149.       { -3, 3, 0},{  1, 6, 0},{ -1, 6, 0},{ 11, 1, 3},{-11, 1, 3},{  6, 2, 1},

  150.       { -6, 2, 1},{  1, 7, 0},{ -1, 7, 0},{  2, 5, 0},{ -2, 5, 0},{  3, 4, 0},

  151.       { -3, 4, 0},{ 12, 1, 3},{-12, 1, 3},{  4, 3, 0},{ -4, 3, 0}

  152.     },

  153.     //level_add

  154.     { 0,13, 7, 5, 4, 3, 2, 2,-1,-1,-1 -1,-1,-1,-1,-1,-1,

  155.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  156.     2, //golomb_order

  157.     4, //inc_limit

  158.     7, //max_run

  159.   },{

  160.     { //level / run

  161.       {  1, 1, 0},{ -1, 1, 0},{  2, 1, 0},{ -2, 1, 0},{  3, 1, 0},{ -3, 1, 0},

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

  163.       { -6, 1, 0},{  1, 2, 0},{ -1, 2, 0},{  7, 1, 0},{ -7, 1, 0},{  8, 1, 1},

  164.       { -8, 1, 1},{  2, 2, 0},{ -2, 2, 0},{  9, 1, 1},{ -9, 1, 1},{ 10, 1, 1},

  165.       {-10, 1, 1},{  1, 3, 0},{ -1, 3, 0},{  3, 2, 0},{ -3, 2, 0},{ 11, 1, 2},

  166.       {-11, 1, 2},{  4, 2, 0},{ -4, 2, 0},{ 12, 1, 2},{-12, 1, 2},{ 13, 1, 2},

  167.       {-13, 1, 2},{  5, 2, 0},{ -5, 2, 0},{  1, 4, 0},{ -1, 4, 0},{  2, 3, 0},

  168.       { -2, 3, 0},{ 14, 1, 2},{-14, 1, 2},{  6, 2, 0},{ -6, 2, 0},{ 15, 1, 2},

  169.       {-15, 1, 2},{ 16, 1, 2},{-16, 1, 2},{  3, 3, 0},{ -3, 3, 0},{  1, 5, 0},

  170.       { -1, 5, 0},{  7, 2, 0},{ -7, 2, 0},{ 17, 1, 2},{-17, 1, 2}

  171.     },

  172.     //level_add

  173.     { 0,18, 8, 4, 2, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  174.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  175.     2, //golomb_order

  176.     7, //inc_limit

  177.     5, //max_run

  178.   },{

  179.     { //level / run

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

  181.       { -3, 1, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},{ -5, 1, 0},{  6, 1, 0},

  182.       { -6, 1, 0},{  7, 1, 0},{ -7, 1, 0},{  8, 1, 0},{ -8, 1, 0},{  9, 1, 0},

  183.       { -9, 1, 0},{ 10, 1, 0},{-10, 1, 0},{  1, 2, 0},{ -1, 2, 0},{ 11, 1, 1},

  184.       {-11, 1, 1},{ 12, 1, 1},{-12, 1, 1},{ 13, 1, 1},{-13, 1, 1},{  2, 2, 0},

  185.       { -2, 2, 0},{ 14, 1, 1},{-14, 1, 1},{ 15, 1, 1},{-15, 1, 1},{  3, 2, 0},

  186.       { -3, 2, 0},{ 16, 1, 1},{-16, 1, 1},{  1, 3, 0},{ -1, 3, 0},{ 17, 1, 1},

  187.       {-17, 1, 1},{  4, 2, 0},{ -4, 2, 0},{ 18, 1, 1},{-18, 1, 1},{  5, 2, 0},

  188.       { -5, 2, 0},{ 19, 1, 1},{-19, 1, 1},{ 20, 1, 1},{-20, 1, 1},{  6, 2, 0},

  189.       { -6, 2, 0},{ 21, 1, 1},{-21, 1, 1},{  2, 3, 0},{ -2, 3, 0}

  190.     },

  191.     //level_add

  192.     { 0,22, 7, 3,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  193.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  194.     2, //golomb_order

  195.     10, //inc_limit

  196.     3, //max_run

  197.   },{

  198.     { //level / run

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

  200.       { -3, 1, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},{ -5, 1, 0},{  6, 1, 0},

  201.       { -6, 1, 0},{  7, 1, 0},{ -7, 1, 0},{  8, 1, 0},{ -8, 1, 0},{  9, 1, 0},

  202.       { -9, 1, 0},{ 10, 1, 0},{-10, 1, 0},{ 11, 1, 0},{-11, 1, 0},{ 12, 1, 0},

  203.       {-12, 1, 0},{ 13, 1, 0},{-13, 1, 0},{ 14, 1, 0},{-14, 1, 0},{ 15, 1, 0},

  204.       {-15, 1, 0},{ 16, 1, 0},{-16, 1, 0},{  1, 2, 0},{ -1, 2, 0},{ 17, 1, 0},

  205.       {-17, 1, 0},{ 18, 1, 0},{-18, 1, 0},{ 19, 1, 0},{-19, 1, 0},{ 20, 1, 0},

  206.       {-20, 1, 0},{ 21, 1, 0},{-21, 1, 0},{  2, 2, 0},{ -2, 2, 0},{ 22, 1, 0},

  207.       {-22, 1, 0},{ 23, 1, 0},{-23, 1, 0},{ 24, 1, 0},{-24, 1, 0},{ 25, 1, 0},

  208.       {-25, 1, 0},{  3, 2, 0},{ -3, 2, 0},{ 26, 1, 0},{-26, 1, 0}

  209.     },

  210.     //level_add

  211.     { 0,27, 4,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  212.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  213.     2, //golomb_order

  214.     INT_MAX, //inc_limit

  215.     2, //max_run

  216.   }

  217. };

  218. 

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

  220.   {

  221.     { //level / run

  222.       {  1, 1, 1},{ -1, 1, 1},{  1, 2, 1},{ -1, 2, 1},{  1, 3, 1},{ -1, 3, 1},

  223.       {  1, 4, 1},{ -1, 4, 1},{  1, 5, 1},{ -1, 5, 1},{  1, 6, 1},{ -1, 6, 1},

  224.       {  1, 7, 1},{ -1, 7, 1},{  1, 8, 1},{ -1, 8, 1},{  1, 9, 1},{ -1, 9, 1},

  225.       {  1,10, 1},{ -1,10, 1},{  1,11, 1},{ -1,11, 1},{  1,12, 1},{ -1,12, 1},

  226.       {  1,13, 1},{ -1,13, 1},{  2, 1, 2},{ -2, 1, 2},{  1,14, 1},{ -1,14, 1},

  227.       {  1,15, 1},{ -1,15, 1},{  1,16, 1},{ -1,16, 1},{  1,17, 1},{ -1,17, 1},

  228.       {  1,18, 1},{ -1,18, 1},{  1,19, 1},{ -1,19, 1},{  3, 1, 3},{ -3, 1, 3},

  229.       {  1,20, 1},{ -1,20, 1},{  1,21, 1},{ -1,21, 1},{  2, 2, 2},{ -2, 2, 2},

  230.       {  1,22, 1},{ -1,22, 1},{  1,23, 1},{ -1,23, 1},{  1,24, 1},{ -1,24, 1},

  231.       {  1,25, 1},{ -1,25, 1},{  1,26, 1},{ -1,26, 1},{   EOB   }

  232.     },

  233.     //level_add

  234.     { 0, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  235.       2, 2, 2, 2, 2, 2, 2, 2, 2, 2},

  236.     3, //golomb_order

  237.     0, //inc_limit

  238.     26 //max_run

  239.   },{

  240.     { //level / run

  241.       {  1, 1, 0},{ -1, 1, 0},{   EOB   },{  1, 2, 0},{ -1, 2, 0},{  1, 3, 0},

  242.       { -1, 3, 0},{  1, 4, 0},{ -1, 4, 0},{  1, 5, 0},{ -1, 5, 0},{  1, 6, 0},

  243.       { -1, 6, 0},{  2, 1, 1},{ -2, 1, 1},{  1, 7, 0},{ -1, 7, 0},{  1, 8, 0},

  244.       { -1, 8, 0},{  1, 9, 0},{ -1, 9, 0},{  1,10, 0},{ -1,10, 0},{  2, 2, 1},

  245.       { -2, 2, 1},{  1,11, 0},{ -1,11, 0},{  1,12, 0},{ -1,12, 0},{  3, 1, 2},

  246.       { -3, 1, 2},{  1,13, 0},{ -1,13, 0},{  1,14, 0},{ -1,14, 0},{  2, 3, 1},

  247.       { -2, 3, 1},{  1,15, 0},{ -1,15, 0},{  2, 4, 1},{ -2, 4, 1},{  1,16, 0},

  248.       { -1,16, 0},{  2, 5, 1},{ -2, 5, 1},{  1,17, 0},{ -1,17, 0},{  4, 1, 3},

  249.       { -4, 1, 3},{  2, 6, 1},{ -2, 6, 1},{  1,18, 0},{ -1,18, 0},{  1,19, 0},

  250.       { -1,19, 0},{  2, 7, 1},{ -2, 7, 1},{  3, 2, 2},{ -3, 2, 2}

  251.     },

  252.     //level_add

  253.     { 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  254.       2, 2, 2,-1,-1,-1,-1,-1,-1,-1},

  255.     2, //golomb_order

  256.     1, //inc_limit

  257.     19 //max_run

  258.   },{

  259.     { //level / run

  260.       {  1, 1, 0},{ -1, 1, 0},{   EOB   },{  1, 2, 0},{ -1, 2, 0},{  2, 1, 0},

  261.       { -2, 1, 0},{  1, 3, 0},{ -1, 3, 0},{  1, 4, 0},{ -1, 4, 0},{  3, 1, 1},

  262.       { -3, 1, 1},{  2, 2, 0},{ -2, 2, 0},{  1, 5, 0},{ -1, 5, 0},{  1, 6, 0},

  263.       { -1, 6, 0},{  1, 7, 0},{ -1, 7, 0},{  2, 3, 0},{ -2, 3, 0},{  4, 1, 2},

  264.       { -4, 1, 2},{  1, 8, 0},{ -1, 8, 0},{  3, 2, 1},{ -3, 2, 1},{  2, 4, 0},

  265.       { -2, 4, 0},{  1, 9, 0},{ -1, 9, 0},{  1,10, 0},{ -1,10, 0},{  5, 1, 2},

  266.       { -5, 1, 2},{  2, 5, 0},{ -2, 5, 0},{  1,11, 0},{ -1,11, 0},{  2, 6, 0},

  267.       { -2, 6, 0},{  1,12, 0},{ -1,12, 0},{  3, 3, 1},{ -3, 3, 1},{  6, 1, 2},

  268.       { -6, 1, 2},{  4, 2, 2},{ -4, 2, 2},{  1,13, 0},{ -1,13, 0},{  2, 7, 0},

  269.       { -2, 7, 0},{  3, 4, 1},{ -3, 4, 1},{  1,14, 0},{ -1,14, 0}

  270.     },

  271.     //level_add

  272.     { 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2,-1,-1,

  273.       -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  274.     2, //golomb_order

  275.     2, //inc_limit

  276.     14 //max_run

  277.   },{

  278.     { //level / run

  279.       {  1, 1, 0},{ -1, 1, 0},{   EOB   },{  2, 1, 0},{ -2, 1, 0},{  1, 2, 0},

  280.       { -1, 2, 0},{  3, 1, 0},{ -3, 1, 0},{  1, 3, 0},{ -1, 3, 0},{  2, 2, 0},

  281.       { -2, 2, 0},{  4, 1, 1},{ -4, 1, 1},{  1, 4, 0},{ -1, 4, 0},{  5, 1, 1},

  282.       { -5, 1, 1},{  1, 5, 0},{ -1, 5, 0},{  3, 2, 0},{ -3, 2, 0},{  2, 3, 0},

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

  284.       { -2, 4, 0},{  1, 7, 0},{ -1, 7, 0},{  4, 2, 1},{ -4, 2, 1},{  7, 1, 2},

  285.       { -7, 1, 2},{  3, 3, 0},{ -3, 3, 0},{  1, 8, 0},{ -1, 8, 0},{  2, 5, 0},

  286.       { -2, 5, 0},{  8, 1, 2},{ -8, 1, 2},{  1, 9, 0},{ -1, 9, 0},{  3, 4, 0},

  287.       { -3, 4, 0},{  2, 6, 0},{ -2, 6, 0},{  5, 2, 1},{ -5, 2, 1},{  1,10, 0},

  288.       { -1,10, 0},{  9, 1, 2},{ -9, 1, 2},{  4, 3, 1},{ -4, 3, 1}

  289.     },

  290.     //level_add

  291.     { 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2,-1,-1,-1,-1,-1,-1,

  292.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  293.     2, //golomb_order

  294.     3, //inc_limit

  295.     10 //max_run

  296.   },{

  297.     { //level / run

  298.       {  1, 1, 0},{ -1, 1, 0},{   EOB   },{  2, 1, 0},{ -2, 1, 0},{  3, 1, 0},

  299.       { -3, 1, 0},{  1, 2, 0},{ -1, 2, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},

  300.       { -5, 1, 0},{  2, 2, 0},{ -2, 2, 0},{  1, 3, 0},{ -1, 3, 0},{  6, 1, 0},

  301.       { -6, 1, 0},{  3, 2, 0},{ -3, 2, 0},{  7, 1, 1},{ -7, 1, 1},{  1, 4, 0},

  302.       { -1, 4, 0},{  8, 1, 1},{ -8, 1, 1},{  2, 3, 0},{ -2, 3, 0},{  4, 2, 0},

  303.       { -4, 2, 0},{  1, 5, 0},{ -1, 5, 0},{  9, 1, 1},{ -9, 1, 1},{  5, 2, 0},

  304.       { -5, 2, 0},{  2, 4, 0},{ -2, 4, 0},{  1, 6, 0},{ -1, 6, 0},{ 10, 1, 2},

  305.       {-10, 1, 2},{  3, 3, 0},{ -3, 3, 0},{ 11, 1, 2},{-11, 1, 2},{  1, 7, 0},

  306.       { -1, 7, 0},{  6, 2, 0},{ -6, 2, 0},{  3, 4, 0},{ -3, 4, 0},{  2, 5, 0},

  307.       { -2, 5, 0},{ 12, 1, 2},{-12, 1, 2},{  4, 3, 0},{ -4, 3, 0}

  308.     },

  309.     //level_add

  310.     { 0,13, 7, 5, 4, 3, 2, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  311.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  312.     2, //golomb_order

  313.     6, //inc_limit

  314.     7  //max_run

  315.   },{

  316.     { //level / run

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

  318.       { -3, 1, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},{ -5, 1, 0},{  1, 2, 0},

  319.       { -1, 2, 0},{  6, 1, 0},{ -6, 1, 0},{  7, 1, 0},{ -7, 1, 0},{  8, 1, 0},

  320.       { -8, 1, 0},{  2, 2, 0},{ -2, 2, 0},{  9, 1, 0},{ -9, 1, 0},{  1, 3, 0},

  321.       { -1, 3, 0},{ 10, 1, 1},{-10, 1, 1},{  3, 2, 0},{ -3, 2, 0},{ 11, 1, 1},

  322.       {-11, 1, 1},{  4, 2, 0},{ -4, 2, 0},{ 12, 1, 1},{-12, 1, 1},{  1, 4, 0},

  323.       { -1, 4, 0},{  2, 3, 0},{ -2, 3, 0},{ 13, 1, 1},{-13, 1, 1},{  5, 2, 0},

  324.       { -5, 2, 0},{ 14, 1, 1},{-14, 1, 1},{  6, 2, 0},{ -6, 2, 0},{  1, 5, 0},

  325.       { -1, 5, 0},{ 15, 1, 1},{-15, 1, 1},{  3, 3, 0},{ -3, 3, 0},{ 16, 1, 1},

  326.       {-16, 1, 1},{  2, 4, 0},{ -2, 4, 0},{  7, 2, 0},{ -7, 2, 0}

  327.     },

  328.     //level_add

  329.     { 0,17, 8, 4, 3, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  330.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  331.     2, //golomb_order

  332.     9, //inc_limit

  333.     5  //max_run

  334.   },{

  335.     { //level / run

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

  337.       { -3, 1, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},{ -5, 1, 0},{  6, 1, 0},

  338.       { -6, 1, 0},{  7, 1, 0},{ -7, 1, 0},{  1, 2, 0},{ -1, 2, 0},{  8, 1, 0},

  339.       { -8, 1, 0},{  9, 1, 0},{ -9, 1, 0},{ 10, 1, 0},{-10, 1, 0},{ 11, 1, 0},

  340.       {-11, 1, 0},{ 12, 1, 0},{-12, 1, 0},{  2, 2, 0},{ -2, 2, 0},{ 13, 1, 0},

  341.       {-13, 1, 0},{  1, 3, 0},{ -1, 3, 0},{ 14, 1, 0},{-14, 1, 0},{ 15, 1, 0},

  342.       {-15, 1, 0},{  3, 2, 0},{ -3, 2, 0},{ 16, 1, 0},{-16, 1, 0},{ 17, 1, 0},

  343.       {-17, 1, 0},{ 18, 1, 0},{-18, 1, 0},{  4, 2, 0},{ -4, 2, 0},{ 19, 1, 0},

  344.       {-19, 1, 0},{ 20, 1, 0},{-20, 1, 0},{  2, 3, 0},{ -2, 3, 0},{  1, 4, 0},

  345.       { -1, 4, 0},{  5, 2, 0},{ -5, 2, 0},{ 21, 1, 0},{-21, 1, 0}

  346.     },

  347.     //level_add

  348.     { 0,22, 6, 3, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  349.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  350.     2, //golomb_order

  351.     INT_MAX, //inc_limit

  352.     4 //max_run

  353.   }

  354. };

  355. 

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

  357.   {

  358.     { //level / run

  359.       {  1, 1, 1},{ -1, 1, 1},{  1, 2, 1},{ -1, 2, 1},{  1, 3, 1},{ -1, 3, 1},

  360.       {  1, 4, 1},{ -1, 4, 1},{  1, 5, 1},{ -1, 5, 1},{  1, 6, 1},{ -1, 6, 1},

  361.       {  1, 7, 1},{ -1, 7, 1},{  2, 1, 2},{ -2, 1, 2},{  1, 8, 1},{ -1, 8, 1},

  362.       {  1, 9, 1},{ -1, 9, 1},{  1,10, 1},{ -1,10, 1},{  1,11, 1},{ -1,11, 1},

  363.       {  1,12, 1},{ -1,12, 1},{  1,13, 1},{ -1,13, 1},{  1,14, 1},{ -1,14, 1},

  364.       {  1,15, 1},{ -1,15, 1},{  3, 1, 3},{ -3, 1, 3},{  1,16, 1},{ -1,16, 1},

  365.       {  1,17, 1},{ -1,17, 1},{  1,18, 1},{ -1,18, 1},{  1,19, 1},{ -1,19, 1},

  366.       {  1,20, 1},{ -1,20, 1},{  1,21, 1},{ -1,21, 1},{  1,22, 1},{ -1,22, 1},

  367.       {  2, 2, 2},{ -2, 2, 2},{  1,23, 1},{ -1,23, 1},{  1,24, 1},{ -1,24, 1},

  368.       {  1,25, 1},{ -1,25, 1},{  4, 1, 3},{ -4, 1, 3},{   EOB   }

  369.     },

  370.     //level_add

  371.     { 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  372.       2, 2, 2, 2, 2, 2, 2, 2, 2,-1},

  373.     2, //golomb_order

  374.     0, //inc_limit

  375.     25 //max_run

  376.   },{

  377.     { //level / run

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

  379.       { -2, 1, 1},{  1, 3, 0},{ -1, 3, 0},{  1, 4, 0},{ -1, 4, 0},{  1, 5, 0},

  380.       { -1, 5, 0},{  1, 6, 0},{ -1, 6, 0},{  3, 1, 2},{ -3, 1, 2},{  1, 7, 0},

  381.       { -1, 7, 0},{  1, 8, 0},{ -1, 8, 0},{  2, 2, 1},{ -2, 2, 1},{  1, 9, 0},

  382.       { -1, 9, 0},{  1,10, 0},{ -1,10, 0},{  1,11, 0},{ -1,11, 0},{  4, 1, 2},

  383.       { -4, 1, 2},{  1,12, 0},{ -1,12, 0},{  1,13, 0},{ -1,13, 0},{  1,14, 0},

  384.       { -1,14, 0},{  2, 3, 1},{ -2, 3, 1},{  1,15, 0},{ -1,15, 0},{  2, 4, 1},

  385.       { -2, 4, 1},{  5, 1, 3},{ -5, 1, 3},{  3, 2, 2},{ -3, 2, 2},{  1,16, 0},

  386.       { -1,16, 0},{  1,17, 0},{ -1,17, 0},{  1,18, 0},{ -1,18, 0},{  2, 5, 1},

  387.       { -2, 5, 1},{  1,19, 0},{ -1,19, 0},{  1,20, 0},{ -1,20, 0}

  388.     },

  389.     //level_add

  390.     { 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  391.       2, 2, 2, 2,-1,-1,-1,-1,-1,-1},

  392.     0, //golomb_order

  393.     1, //inc_limit

  394.     20 //max_run

  395.   },{

  396.     { //level / run

  397.       {  1, 1, 0},{ -1, 1, 0},{   EOB   },{  2, 1, 0},{ -2, 1, 0},{  1, 2, 0},

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

  399.       { -4, 1, 1},{  2, 2, 0},{ -2, 2, 0},{  1, 4, 0},{ -1, 4, 0},{  5, 1, 2},

  400.       { -5, 1, 2},{  1, 5, 0},{ -1, 5, 0},{  3, 2, 1},{ -3, 2, 1},{  2, 3, 0},

  401.       { -2, 3, 0},{  1, 6, 0},{ -1, 6, 0},{  6, 1, 2},{ -6, 1, 2},{  1, 7, 0},

  402.       { -1, 7, 0},{  2, 4, 0},{ -2, 4, 0},{  7, 1, 2},{ -7, 1, 2},{  1, 8, 0},

  403.       { -1, 8, 0},{  4, 2, 1},{ -4, 2, 1},{  1, 9, 0},{ -1, 9, 0},{  3, 3, 1},

  404.       { -3, 3, 1},{  2, 5, 0},{ -2, 5, 0},{  2, 6, 0},{ -2, 6, 0},{  8, 1, 2},

  405.       { -8, 1, 2},{  1,10, 0},{ -1,10, 0},{  1,11, 0},{ -1,11, 0},{  9, 1, 2},

  406.       { -9, 1, 2},{  5, 2, 2},{ -5, 2, 2},{  3, 4, 1},{ -3, 4, 1},

  407.     },

  408.     //level_add

  409.     { 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2,-1,-1,-1,-1,-1,

  410.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  411.     1, //golomb_order

  412.     2, //inc_limit

  413.     11 //max_run

  414.   },{

  415.     { //level / run

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

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

  418.       { -5, 1, 1},{  2, 2, 0},{ -2, 2, 0},{  6, 1, 1},{ -6, 1, 1},{  1, 3, 0},

  419.       { -1, 3, 0},{  7, 1, 1},{ -7, 1, 1},{  3, 2, 0},{ -3, 2, 0},{  8, 1, 1},

  420.       { -8, 1, 1},{  1, 4, 0},{ -1, 4, 0},{  2, 3, 0},{ -2, 3, 0},{  9, 1, 1},

  421.       { -9, 1, 1},{  4, 2, 0},{ -4, 2, 0},{  1, 5, 0},{ -1, 5, 0},{ 10, 1, 1},

  422.       {-10, 1, 1},{  3, 3, 0},{ -3, 3, 0},{  5, 2, 1},{ -5, 2, 1},{  2, 4, 0},

  423.       { -2, 4, 0},{ 11, 1, 1},{-11, 1, 1},{  1, 6, 0},{ -1, 6, 0},{ 12, 1, 1},

  424.       {-12, 1, 1},{  1, 7, 0},{ -1, 7, 0},{  6, 2, 1},{ -6, 2, 1},{ 13, 1, 1},

  425.       {-13, 1, 1},{  2, 5, 0},{ -2, 5, 0},{  1, 8, 0},{ -1, 8, 0},

  426.     },

  427.     //level_add

  428.     { 0,14, 7, 4, 3, 3, 2, 2, 2,-1,-1,-1,-1,-1,-1,-1,-1,

  429.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  430.     1, //golomb_order

  431.     4, //inc_limit

  432.     8  //max_run

  433.   },{

  434.     { //level / run

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

  436.       { -3, 1, 0},{  4, 1, 0},{ -4, 1, 0},{  5, 1, 0},{ -5, 1, 0},{  6, 1, 0},

  437.       { -6, 1, 0},{  7, 1, 0},{ -7, 1, 0},{  8, 1, 0},{ -8, 1, 0},{  1, 2, 0},

  438.       { -1, 2, 0},{  9, 1, 0},{ -9, 1, 0},{ 10, 1, 0},{-10, 1, 0},{ 11, 1, 0},

  439.       {-11, 1, 0},{  2, 2, 0},{ -2, 2, 0},{ 12, 1, 0},{-12, 1, 0},{ 13, 1, 0},

  440.       {-13, 1, 0},{  3, 2, 0},{ -3, 2, 0},{ 14, 1, 0},{-14, 1, 0},{  1, 3, 0},

  441.       { -1, 3, 0},{ 15, 1, 0},{-15, 1, 0},{  4, 2, 0},{ -4, 2, 0},{ 16, 1, 0},

  442.       {-16, 1, 0},{ 17, 1, 0},{-17, 1, 0},{  5, 2, 0},{ -5, 2, 0},{  1, 4, 0},

  443.       { -1, 4, 0},{  2, 3, 0},{ -2, 3, 0},{ 18, 1, 0},{-18, 1, 0},{  6, 2, 0},

  444.       { -6, 2, 0},{ 19, 1, 0},{-19, 1, 0},{  1, 5, 0},{ -1, 5, 0},

  445.     },

  446.     //level_add

  447.     { 0,20, 7, 3, 2, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  448.      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1},

  449.     0, //golomb_order

  450.     INT_MAX, //inc_limit

  451.     5, //max_run

  452.   }

  453. };

  454. 

  455. #undef EOB

  456. 

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

  458.  *

  459.  * motion vector prediction

  460.  *

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

  462. 

  463. static inline void store_mvs(AVSContext *h) {

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

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

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

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

  468. }

  469. 

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

  471.                                   cavs_vector *col_mv) {

  472.     cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  475. 

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

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

  478.     pmv_fw->ref = 1;

  479.     pmv_bw->ref = 0;

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

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

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

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

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

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

  486. }

  487. 

  488. static inline void mv_pred_sym(AVSContext *h, cavs_vector *src, enum cavs_block size) {

  489.     cavs_vector *dst = src + MV_BWD_OFFS;

  490. 

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

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

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

  494.     dst->ref = 0;

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

  496.     set_mvs(dst, size);

  497. }

  498. 

  499. /*****************************************************************************

  500.  *

  501.  * residual data decoding

  502.  *

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

  504. 

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

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

  507.     if(order) {

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

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

  510.     }

  511.     return get_ue_golomb(gb);

  512. }

  513. 

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

  515.                           DCTELEM *dst, int mul, int shift, int coeff_num) {

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

  517.     int pos = -1;

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

  519. 

  520.     /* inverse scan and dequantization */

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

  522.         pos += run_buf[coeff_num];

  523.         if(pos > 63) {

  524.             av_log(h->s.avctx, AV_LOG_ERROR,

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

  526.                 h->picture.poc, h->mbx, h->mby);

  527.             return -1;

  528.         }

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

  530.     }

  531.     return 0;

  532. }

  533. 

  534. /**

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

  536.  *  and add them to sample block

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

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

  539.  * @param qp quantizer

  540.  * @param dst location of sample block

  541.  * @param stride line stride in frame buffer

  542.  */

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

  544.                                  const struct dec_2dvlc *r, int esc_golomb_order,

  545.                                  int qp, uint8_t *dst, int stride) {

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

  547.     DCTELEM level_buf[65];

  548.     uint8_t run_buf[65];

  549.     DCTELEM *block = h->block;

  550. 

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

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

  553.         if(level_code >= ESCAPE_CODE) {

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

  555.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  557.             while(level > r->inc_limit)

  558.                 r++;

  559.             mask = -(level_code & 1);

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

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

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

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

  564.                 break;

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

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

  567.         } else {

  568.             break;

  569.         }

  570.         level_buf[i] = level;

  571.         run_buf[i] = run;

  572.     }

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

  574.                 dequant_shift[qp], i))

  575.         return -1;

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

  577.     h->s.dsp.clear_block(block);

  578.     return 0;

  579. }

  580. 

  581. 

  582. static inline void decode_residual_chroma(AVSContext *h) {

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

  584.         decode_residual_block(h, &h->s.gb, chroma_dec, 0,

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

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

  587.         decode_residual_block(h, &h->s.gb, chroma_dec, 0,

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

  589. }

  590. 

  591. static inline int decode_residual_inter(AVSContext *h) {

  592.     int block;

  593. 

  594.     /* get coded block pattern */

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

  596.     if(cbp > 63){

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

  598.         return -1;

  599.     }

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

  601. 

  602.     /* get quantizer */

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

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

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

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

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

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

  609.     decode_residual_chroma(h);

  610. 

  611.     return 0;

  612. }

  613. 

  614. /*****************************************************************************

  615.  *

  616.  * macroblock level

  617.  *

  618.  ****************************************************************************/

  619. 

  620. static inline void set_mv_intra(AVSContext *h) {

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

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

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

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

  625.     if(h->pic_type != AV_PICTURE_TYPE_B)

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

  627. }

  628. 

  629. static int decode_mb_i(AVSContext *h, int cbp_code) {

  630.     GetBitContext *gb = &h->s.gb;

  631.     unsigned pred_mode_uv;

  632.     int block;

  633.     uint8_t top[18];

  634.     uint8_t *left = NULL;

  635.     uint8_t *d;

  636. 

  637.     ff_cavs_init_mb(h);

  638. 

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

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

  641.         int nA,nB,predpred;

  642.         int pos = scan3x3[block];

  643. 

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

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

  646.         predpred = FFMIN(nA,nB);

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

  648.             predpred = INTRA_L_LP;

  649.         if(!get_bits1(gb)){

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

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

  652.         }

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

  654.     }

  655.     pred_mode_uv = get_ue_golomb(gb);

  656.     if(pred_mode_uv > 6) {

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

  658.         return -1;

  659.     }

  660.     ff_cavs_modify_mb_i(h, &pred_mode_uv);

  661. 

  662.     /* get coded block pattern */

  663.     if(h->pic_type == AV_PICTURE_TYPE_I)

  664.         cbp_code = get_ue_golomb(gb);

  665.     if(cbp_code > 63){

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

  667.         return -1;

  668.     }

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

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

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

  672. 

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

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

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

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

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

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

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

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

  681.     }

  682. 

  683.     /* chroma intra prediction */

  684.     ff_cavs_load_intra_pred_chroma(h);

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

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

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

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

  689. 

  690.     decode_residual_chroma(h);

  691.     ff_cavs_filter(h,I_8X8);

  692.     set_mv_intra(h);

  693.     return 0;

  694. }

  695. 

  696. static inline void set_intra_mode_default(AVSContext *h) {

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

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

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

  700.     } else {

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

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

  703.     }

  704. }

  705. 

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

  707.     GetBitContext *gb = &h->s.gb;

  708.     int ref[4];

  709. 

  710.     ff_cavs_init_mb(h);

  711.     switch(mb_type) {

  712.     case P_SKIP:

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

  714.         break;

  715.     case P_16X16:

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

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

  718.         break;

  719.     case P_16X8:

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

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

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

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

  724.         break;

  725.     case P_8X16:

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

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

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

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

  730.         break;

  731.     case P_8X8:

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

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

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

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

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

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

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

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

  740.     }

  741.     ff_cavs_inter(h, mb_type);

  742.     set_intra_mode_default(h);

  743.     store_mvs(h);

  744.     if(mb_type != P_SKIP)

  745.         decode_residual_inter(h);

  746.     ff_cavs_filter(h,mb_type);

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

  748. }

  749. 

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

  751.     int block;

  752.     enum cavs_sub_mb sub_type[4];

  753.     int flags;

  754. 

  755.     ff_cavs_init_mb(h);

  756. 

  757.     /* reset all MVs */

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

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

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

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

  762.     switch(mb_type) {

  763.     case B_SKIP:

  764.     case B_DIRECT:

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

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

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

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

  769.         } else

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

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

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

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

  774.         break;

  775.     case B_FWD_16X16:

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

  777.         break;

  778.     case B_SYM_16X16:

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

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

  781.         break;

  782.     case B_BWD_16X16:

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

  784.         break;

  785.     case B_8X8:

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

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

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

  789.             switch(sub_type[block]) {

  790.             case B_SUB_DIRECT:

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

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

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

  794.                             MV_PRED_BSKIP, BLK_8X8, 1);

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

  796.                             mv_scan[block]-3+MV_BWD_OFFS,

  797.                             MV_PRED_BSKIP, BLK_8X8, 0);

  798.                 } else

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

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

  801.                 break;

  802.             case B_SUB_FWD:

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

  804.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  805.                 break;

  806.             case B_SUB_SYM:

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

  808.                         MV_PRED_MEDIAN, BLK_8X8, 1);

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

  810.                 break;

  811.             }

  812.         }

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

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

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

  816.                         mv_scan[block]+MV_BWD_OFFS-3,

  817.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  818.         }

  819.         break;

  820.     default:

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

  822.         flags = ff_cavs_partition_flags[mb_type];

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

  824.             if(flags & FWD0)

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

  826.             if(flags & SYM0)

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

  828.             if(flags & FWD1)

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

  830.             if(flags & SYM1)

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

  832.             if(flags & BWD0)

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

  834.             if(flags & BWD1)

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

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

  837.             if(flags & FWD0)

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

  839.             if(flags & SYM0)

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

  841.             if(flags & FWD1)

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

  843.             if(flags & SYM1)

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

  845.             if(flags & BWD0)

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

  847.             if(flags & BWD1)

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

  849.         }

  850.     }

  851.     ff_cavs_inter(h, mb_type);

  852.     set_intra_mode_default(h);

  853.     if(mb_type != B_SKIP)

  854.         decode_residual_inter(h);

  855.     ff_cavs_filter(h,mb_type);

  856. }

  857. 

  858. /*****************************************************************************

  859.  *

  860.  * slice level

  861.  *

  862.  ****************************************************************************/

  863. 

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

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

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

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

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

  869. 

  870.     /* mark top macroblocks as unavailable */

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

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

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

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

  875.     }

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

  877.     if((h->pic_type != AV_PICTURE_TYPE_I) || (!h->pic_structure && h->mby >= h->mb_width/2))

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

  879.             av_log(h->s.avctx, AV_LOG_ERROR,

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

  881.         }

  882.     return 0;

  883. }

  884. 

  885. static inline int check_for_slice(AVSContext *h) {

  886.     GetBitContext *gb = &h->s.gb;

  887.     int align;

  888. 

  889.     if(h->mbx)

  890.         return 0;

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

  892.     /* check for stuffing byte */

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

  894.         align = 8;

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

  896.         skip_bits_long(gb,24+align);

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

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

  899.             return 0;

  900.         decode_slice_header(h,gb);

  901.         return 1;

  902.     }

  903.     return 0;

  904. }

  905. 

  906. /*****************************************************************************

  907.  *

  908.  * frame level

  909.  *

  910.  ****************************************************************************/

  911. 

  912. static int decode_pic(AVSContext *h) {

  913.     MpegEncContext *s = &h->s;

  914.     int skip_count = -1;

  915.     enum cavs_mb mb_type;

  916. 

  917.     if (!s->context_initialized) {

  918.         if (ff_MPV_common_init(s) < 0)

  919.             return -1;

  920.         ff_init_scantable_permutation(s->dsp.idct_permutation,

  921.                                       h->cdsp.idct_perm);

  922.         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);

  923.     }

  924.     skip_bits(&s->gb,16);//bbv_dwlay

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

  926.         h->pic_type = get_bits(&s->gb,2) + AV_PICTURE_TYPE_I;

  927.         if(h->pic_type > AV_PICTURE_TYPE_B) {

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

  929.             return -1;

  930.         }

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

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

  933.           (!h->DPB[1].f.data[0] && h->pic_type == AV_PICTURE_TYPE_B))

  934.             return -1;

  935.     } else {

  936.         h->pic_type = AV_PICTURE_TYPE_I;

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

  938.             skip_bits(&s->gb,24);//time_code

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

  940.            bump stream revision if detected otherwise */

  941.         if (s->low_delay || !(show_bits(&s->gb,9) & 1))

  942.             h->stream_revision = 1;

  943.         /* similarly test top_field_first and repeat_first_field */

  944.         else if(show_bits(&s->gb,11) & 3)

  945.             h->stream_revision = 1;

  946.         if(h->stream_revision > 0)

  947.             skip_bits(&s->gb,1); //marker_bit

  948.     }

  949.     /* release last B frame */

  950.     if(h->picture.f.data[0])

  951.         s->avctx->release_buffer(s->avctx, &h->picture.f);

  952. 

  953.     s->avctx->get_buffer(s->avctx, &h->picture.f);

  954.     ff_cavs_init_pic(h);

  955.     h->picture.poc = get_bits(&s->gb,8)*2;

  956. 

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

  958.     if(h->pic_type != AV_PICTURE_TYPE_B) {

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

  960.     } else {

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

  962.     }

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

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

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

  966.     if(h->pic_type == AV_PICTURE_TYPE_B) {

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

  968.     } else {

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

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

  971.     }

  972. 

  973.     if(s->low_delay)

  974.         get_ue_golomb(&s->gb); //bbv_check_times

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

  976.     h->pic_structure = 1;

  977.     if(!h->progressive)

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

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

  980.         skip_bits1(&s->gb);     //advanced_pred_mode_disable

  981.     skip_bits1(&s->gb);        //top_field_first

  982.     skip_bits1(&s->gb);        //repeat_first_field

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

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

  985.     if(h->pic_type == AV_PICTURE_TYPE_I) {

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

  987.             skip_bits1(&s->gb);//what is this?

  988.         skip_bits(&s->gb,4);   //reserved bits

  989.     } else {

  990.         if(!(h->pic_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))

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

  992.         skip_bits(&s->gb,4);   //reserved bits

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

  994.     }

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

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

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

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

  999.     } else {

  1000.         h->alpha_offset = h->beta_offset  = 0;

  1001.     }

  1002.     if(h->pic_type == AV_PICTURE_TYPE_I) {

  1003.         do {

  1004.             check_for_slice(h);

  1005.             decode_mb_i(h, 0);

  1006.         } while(ff_cavs_next_mb(h));

  1007.     } else if(h->pic_type == AV_PICTURE_TYPE_P) {

  1008.         do {

  1009.             if(check_for_slice(h))

  1010.                 skip_count = -1;

  1011.             if(h->skip_mode_flag && (skip_count < 0))

  1012.                 skip_count = get_ue_golomb(&s->gb);

  1013.             if(h->skip_mode_flag && skip_count--) {

  1014.                 decode_mb_p(h,P_SKIP);

  1015.             } else {

  1016.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP + h->skip_mode_flag;

  1017.                 if(mb_type > P_8X8)

  1018.                     decode_mb_i(h, mb_type - P_8X8 - 1);

  1019.                 else

  1020.                     decode_mb_p(h,mb_type);

  1021.             }

  1022.         } while(ff_cavs_next_mb(h));

  1023.     } else { /* AV_PICTURE_TYPE_B */

  1024.         do {

  1025.             if(check_for_slice(h))

  1026.                 skip_count = -1;

  1027.             if(h->skip_mode_flag && (skip_count < 0))

  1028.                 skip_count = get_ue_golomb(&s->gb);

  1029.             if(h->skip_mode_flag && skip_count--) {

  1030.                 decode_mb_b(h,B_SKIP);

  1031.             } else {

  1032.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP + h->skip_mode_flag;

  1033.                 if(mb_type > B_8X8)

  1034.                     decode_mb_i(h, mb_type - B_8X8 - 1);

  1035.                 else

  1036.                     decode_mb_b(h,mb_type);

  1037.             }

  1038.         } while(ff_cavs_next_mb(h));

  1039.     }

  1040.     if(h->pic_type != AV_PICTURE_TYPE_B) {

  1041.         if(h->DPB[1].f.data[0])

  1042.             s->avctx->release_buffer(s->avctx, &h->DPB[1].f);

  1043.         h->DPB[1] = h->DPB[0];

  1044.         h->DPB[0] = h->picture;

  1045.         memset(&h->picture,0,sizeof(Picture));

  1046.     }

  1047.     return 0;

  1048. }

  1049. 

  1050. /*****************************************************************************

  1051.  *

  1052.  * headers and interface

  1053.  *

  1054.  ****************************************************************************/

  1055. 

  1056. static int decode_seq_header(AVSContext *h) {

  1057.     MpegEncContext *s = &h->s;

  1058.     int frame_rate_code;

  1059.     int width, height;

  1060. 

  1061.     h->profile =         get_bits(&s->gb,8);

  1062.     h->level =           get_bits(&s->gb,8);

  1063.     skip_bits1(&s->gb); //progressive sequence

  1064. 

  1065.     width  = get_bits(&s->gb, 14);

  1066.     height = get_bits(&s->gb, 14);

  1067.     if ((s->width || s->height) && (s->width != width || s->height != height)) {

  1068.         av_log_missing_feature(s, "Width/height changing in CAVS is", 0);

  1069.         return AVERROR_PATCHWELCOME;

  1070.     }

  1071.     s->width  = width;

  1072.     s->height = height;

  1073. 

  1074.     skip_bits(&s->gb,2); //chroma format

  1075.     skip_bits(&s->gb,3); //sample_precision

  1076.     h->aspect_ratio =    get_bits(&s->gb,4);

  1077.     frame_rate_code =    get_bits(&s->gb,4);

  1078.     skip_bits(&s->gb,18);//bit_rate_lower

  1079.     skip_bits1(&s->gb);  //marker_bit

  1080.     skip_bits(&s->gb,12);//bit_rate_upper

  1081.     s->low_delay =       get_bits1(&s->gb);

  1082.     h->mb_width  = (s->width  + 15) >> 4;

  1083.     h->mb_height = (s->height + 15) >> 4;

  1084.     h->s.avctx->time_base.den = avpriv_frame_rate_tab[frame_rate_code].num;

  1085.     h->s.avctx->time_base.num = avpriv_frame_rate_tab[frame_rate_code].den;

  1086.     h->s.avctx->width  = s->width;

  1087.     h->s.avctx->height = s->height;

  1088.     if(!h->top_qp)

  1089.         ff_cavs_init_top_lines(h);

  1090.     return 0;

  1091. }

  1092. 

  1093. static void cavs_flush(AVCodecContext * avctx) {

  1094.     AVSContext *h = avctx->priv_data;

  1095.     h->got_keyframe = 0;

  1096. }

  1097. 

  1098. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1099.                              AVPacket *avpkt) {

  1100.     const uint8_t *buf = avpkt->data;

  1101.     int buf_size = avpkt->size;

  1102.     AVSContext *h = avctx->priv_data;

  1103.     MpegEncContext *s = &h->s;

  1104.     int input_size;

  1105.     const uint8_t *buf_end;

  1106.     const uint8_t *buf_ptr;

  1107.     AVFrame *picture = data;

  1108.     uint32_t stc = -1;

  1109. 

  1110.     s->avctx = avctx;

  1111. 

  1112.     if (buf_size == 0) {

  1113.         if (!s->low_delay && h->DPB[0].f.data[0]) {

  1114.             *data_size = sizeof(AVPicture);

  1115.             *picture = h->DPB[0].f;

  1116.             memset(&h->DPB[0], 0, sizeof(h->DPB[0]));

  1117.         }

  1118.         return 0;

  1119.     }

  1120. 

  1121.     buf_ptr = buf;

  1122.     buf_end = buf + buf_size;

  1123.     for(;;) {

  1124.         buf_ptr = avpriv_mpv_find_start_code(buf_ptr,buf_end, &stc);

  1125.         if((stc & 0xFFFFFE00) || buf_ptr == buf_end)

  1126.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1127.         input_size = (buf_end - buf_ptr)*8;

  1128.         switch(stc) {

  1129.         case CAVS_START_CODE:

  1130.             init_get_bits(&s->gb, buf_ptr, input_size);

  1131.             decode_seq_header(h);

  1132.             break;

  1133.         case PIC_I_START_CODE:

  1134.             if(!h->got_keyframe) {

  1135.                 if(h->DPB[0].f.data[0])

  1136.                     avctx->release_buffer(avctx, &h->DPB[0].f);

  1137.                 if(h->DPB[1].f.data[0])

  1138.                     avctx->release_buffer(avctx, &h->DPB[1].f);

  1139.                 h->got_keyframe = 1;

  1140.             }

  1141.         case PIC_PB_START_CODE:

  1142.             *data_size = 0;

  1143.             if(!h->got_keyframe)

  1144.                 break;

  1145.             init_get_bits(&s->gb, buf_ptr, input_size);

  1146.             h->stc = stc;

  1147.             if(decode_pic(h))

  1148.                 break;

  1149.             *data_size = sizeof(AVPicture);

  1150.             if(h->pic_type != AV_PICTURE_TYPE_B) {

  1151.                 if(h->DPB[1].f.data[0]) {

  1152.                     *picture = h->DPB[1].f;

  1153.                 } else {

  1154.                     *data_size = 0;

  1155.                 }

  1156.             } else

  1157.                 *picture = h->picture.f;

  1158.             break;

  1159.         case EXT_START_CODE:

  1160.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1161.             break;

  1162.         case USER_START_CODE:

  1163.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1164.             break;

  1165.         default:

  1166.             if (stc <= SLICE_MAX_START_CODE) {

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

  1168.                 decode_slice_header(h, &s->gb);

  1169.             }

  1170.             break;

  1171.         }

  1172.     }

  1173. }

  1174. 

  1175. AVCodec ff_cavs_decoder = {

  1176.     .name           = "cavs",

  1177.     .type           = AVMEDIA_TYPE_VIDEO,

  1178.     .id             = AV_CODEC_ID_CAVS,

  1179.     .priv_data_size = sizeof(AVSContext),

  1180.     .init           = ff_cavs_init,

  1181.     .close          = ff_cavs_end,

  1182.     .decode         = cavs_decode_frame,

  1183.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1184.     .flush          = cavs_flush,

  1185.     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),

  1186. };