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FFmpeg/libavcodec/sanm.c

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  1. /*

  2.  * LucasArts Smush video decoder

  3.  * Copyright (c) 2006 Cyril Zorin

  4.  * Copyright (c) 2011 Konstantin Shishkov

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

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

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

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

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. #include "libavutil/avassert.h"

  24. #include "libavutil/bswap.h"

  25. #include "libavutil/imgutils.h"

  26. 

  27. #include "avcodec.h"

  28. #include "bytestream.h"

  29. #include "copy_block.h"

  30. #include "internal.h"

  31. 

  32. #define NGLYPHS 256

  33. #define GLYPH_COORD_VECT_SIZE 16

  34. #define PALETTE_SIZE 256

  35. #define PALETTE_DELTA 768

  36. 

  37. static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE] = {

  38.     0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1

  39. };

  40. 

  41. static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE] = {

  42.     0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2

  43. };

  44. 

  45. static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE] = {

  46.     0, 2, 5, 7, 7, 7, 7, 7, 7, 5, 2, 0, 0, 0, 0, 0

  47. };

  48. 

  49. static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE] = {

  50.     0, 0, 0, 0, 1, 3, 4, 6, 7, 7, 7, 7, 6, 4, 3, 1

  51. };

  52. 

  53. static const int8_t motion_vectors[256][2] = {

  54.     {   0,   0 }, {  -1, -43 }, {   6, -43 }, {  -9, -42 }, {  13, -41 },

  55.     { -16, -40 }, {  19, -39 }, { -23, -36 }, {  26, -34 }, {  -2, -33 },

  56.     {   4, -33 }, { -29, -32 }, {  -9, -32 }, {  11, -31 }, { -16, -29 },

  57.     {  32, -29 }, {  18, -28 }, { -34, -26 }, { -22, -25 }, {  -1, -25 },

  58.     {   3, -25 }, {  -7, -24 }, {   8, -24 }, {  24, -23 }, {  36, -23 },

  59.     { -12, -22 }, {  13, -21 }, { -38, -20 }, {   0, -20 }, { -27, -19 },

  60.     {  -4, -19 }, {   4, -19 }, { -17, -18 }, {  -8, -17 }, {   8, -17 },

  61.     {  18, -17 }, {  28, -17 }, {  39, -17 }, { -12, -15 }, {  12, -15 },

  62.     { -21, -14 }, {  -1, -14 }, {   1, -14 }, { -41, -13 }, {  -5, -13 },

  63.     {   5, -13 }, {  21, -13 }, { -31, -12 }, { -15, -11 }, {  -8, -11 },

  64.     {   8, -11 }, {  15, -11 }, {  -2, -10 }, {   1, -10 }, {  31, -10 },

  65.     { -23,  -9 }, { -11,  -9 }, {  -5,  -9 }, {   4,  -9 }, {  11,  -9 },

  66.     {  42,  -9 }, {   6,  -8 }, {  24,  -8 }, { -18,  -7 }, {  -7,  -7 },

  67.     {  -3,  -7 }, {  -1,  -7 }, {   2,  -7 }, {  18,  -7 }, { -43,  -6 },

  68.     { -13,  -6 }, {  -4,  -6 }, {   4,  -6 }, {   8,  -6 }, { -33,  -5 },

  69.     {  -9,  -5 }, {  -2,  -5 }, {   0,  -5 }, {   2,  -5 }, {   5,  -5 },

  70.     {  13,  -5 }, { -25,  -4 }, {  -6,  -4 }, {  -3,  -4 }, {   3,  -4 },

  71.     {   9,  -4 }, { -19,  -3 }, {  -7,  -3 }, {  -4,  -3 }, {  -2,  -3 },

  72.     {  -1,  -3 }, {   0,  -3 }, {   1,  -3 }, {   2,  -3 }, {   4,  -3 },

  73.     {   6,  -3 }, {  33,  -3 }, { -14,  -2 }, { -10,  -2 }, {  -5,  -2 },

  74.     {  -3,  -2 }, {  -2,  -2 }, {  -1,  -2 }, {   0,  -2 }, {   1,  -2 },

  75.     {   2,  -2 }, {   3,  -2 }, {   5,  -2 }, {   7,  -2 }, {  14,  -2 },

  76.     {  19,  -2 }, {  25,  -2 }, {  43,  -2 }, {  -7,  -1 }, {  -3,  -1 },

  77.     {  -2,  -1 }, {  -1,  -1 }, {   0,  -1 }, {   1,  -1 }, {   2,  -1 },

  78.     {   3,  -1 }, {  10,  -1 }, {  -5,   0 }, {  -3,   0 }, {  -2,   0 },

  79.     {  -1,   0 }, {   1,   0 }, {   2,   0 }, {   3,   0 }, {   5,   0 },

  80.     {   7,   0 }, { -10,   1 }, {  -7,   1 }, {  -3,   1 }, {  -2,   1 },

  81.     {  -1,   1 }, {   0,   1 }, {   1,   1 }, {   2,   1 }, {   3,   1 },

  82.     { -43,   2 }, { -25,   2 }, { -19,   2 }, { -14,   2 }, {  -5,   2 },

  83.     {  -3,   2 }, {  -2,   2 }, {  -1,   2 }, {   0,   2 }, {   1,   2 },

  84.     {   2,   2 }, {   3,   2 }, {   5,   2 }, {   7,   2 }, {  10,   2 },

  85.     {  14,   2 }, { -33,   3 }, {  -6,   3 }, {  -4,   3 }, {  -2,   3 },

  86.     {  -1,   3 }, {   0,   3 }, {   1,   3 }, {   2,   3 }, {   4,   3 },

  87.     {  19,   3 }, {  -9,   4 }, {  -3,   4 }, {   3,   4 }, {   7,   4 },

  88.     {  25,   4 }, { -13,   5 }, {  -5,   5 }, {  -2,   5 }, {   0,   5 },

  89.     {   2,   5 }, {   5,   5 }, {   9,   5 }, {  33,   5 }, {  -8,   6 },

  90.     {  -4,   6 }, {   4,   6 }, {  13,   6 }, {  43,   6 }, { -18,   7 },

  91.     {  -2,   7 }, {   0,   7 }, {   2,   7 }, {   7,   7 }, {  18,   7 },

  92.     { -24,   8 }, {  -6,   8 }, { -42,   9 }, { -11,   9 }, {  -4,   9 },

  93.     {   5,   9 }, {  11,   9 }, {  23,   9 }, { -31,  10 }, {  -1,  10 },

  94.     {   2,  10 }, { -15,  11 }, {  -8,  11 }, {   8,  11 }, {  15,  11 },

  95.     {  31,  12 }, { -21,  13 }, {  -5,  13 }, {   5,  13 }, {  41,  13 },

  96.     {  -1,  14 }, {   1,  14 }, {  21,  14 }, { -12,  15 }, {  12,  15 },

  97.     { -39,  17 }, { -28,  17 }, { -18,  17 }, {  -8,  17 }, {   8,  17 },

  98.     {  17,  18 }, {  -4,  19 }, {   0,  19 }, {   4,  19 }, {  27,  19 },

  99.     {  38,  20 }, { -13,  21 }, {  12,  22 }, { -36,  23 }, { -24,  23 },

  100.     {  -8,  24 }, {   7,  24 }, {  -3,  25 }, {   1,  25 }, {  22,  25 },

  101.     {  34,  26 }, { -18,  28 }, { -32,  29 }, {  16,  29 }, { -11,  31 },

  102.     {   9,  32 }, {  29,  32 }, {  -4,  33 }, {   2,  33 }, { -26,  34 },

  103.     {  23,  36 }, { -19,  39 }, {  16,  40 }, { -13,  41 }, {   9,  42 },

  104.     {  -6,  43 }, {   1,  43 }, {   0,   0 }, {   0,   0 }, {   0,   0 },

  105. };

  106. 

  107. static const int8_t c37_mv[] = {

  108.     0,   0,   1,   0,   2,   0,   3,   0,   5,   0,

  109.     8,   0,  13,   0,  21,   0,  -1,   0,  -2,   0,

  110.    -3,   0,  -5,   0,  -8,   0, -13,   0, -17,   0,

  111.   -21,   0,   0,   1,   1,   1,   2,   1,   3,   1,

  112.     5,   1,   8,   1,  13,   1,  21,   1,  -1,   1,

  113.    -2,   1,  -3,   1,  -5,   1,  -8,   1, -13,   1,

  114.   -17,   1, -21,   1,   0,   2,   1,   2,   2,   2,

  115.     3,   2,   5,   2,   8,   2,  13,   2,  21,   2,

  116.    -1,   2,  -2,   2,  -3,   2,  -5,   2,  -8,   2,

  117.   -13,   2, -17,   2, -21,   2,   0,   3,   1,   3,

  118.     2,   3,   3,   3,   5,   3,   8,   3,  13,   3,

  119.    21,   3,  -1,   3,  -2,   3,  -3,   3,  -5,   3,

  120.    -8,   3, -13,   3, -17,   3, -21,   3,   0,   5,

  121.     1,   5,   2,   5,   3,   5,   5,   5,   8,   5,

  122.    13,   5,  21,   5,  -1,   5,  -2,   5,  -3,   5,

  123.    -5,   5,  -8,   5, -13,   5, -17,   5, -21,   5,

  124.     0,   8,   1,   8,   2,   8,   3,   8,   5,   8,

  125.     8,   8,  13,   8,  21,   8,  -1,   8,  -2,   8,

  126.    -3,   8,  -5,   8,  -8,   8, -13,   8, -17,   8,

  127.   -21,   8,   0,  13,   1,  13,   2,  13,   3,  13,

  128.     5,  13,   8,  13,  13,  13,  21,  13,  -1,  13,

  129.    -2,  13,  -3,  13,  -5,  13,  -8,  13, -13,  13,

  130.   -17,  13, -21,  13,   0,  21,   1,  21,   2,  21,

  131.     3,  21,   5,  21,   8,  21,  13,  21,  21,  21,

  132.    -1,  21,  -2,  21,  -3,  21,  -5,  21,  -8,  21,

  133.   -13,  21, -17,  21, -21,  21,   0,  -1,   1,  -1,

  134.     2,  -1,   3,  -1,   5,  -1,   8,  -1,  13,  -1,

  135.    21,  -1,  -1,  -1,  -2,  -1,  -3,  -1,  -5,  -1,

  136.    -8,  -1, -13,  -1, -17,  -1, -21,  -1,   0,  -2,

  137.     1,  -2,   2,  -2,   3,  -2,   5,  -2,   8,  -2,

  138.    13,  -2,  21,  -2,  -1,  -2,  -2,  -2,  -3,  -2,

  139.    -5,  -2,  -8,  -2, -13,  -2, -17,  -2, -21,  -2,

  140.     0,  -3,   1,  -3,   2,  -3,   3,  -3,   5,  -3,

  141.     8,  -3,  13,  -3,  21,  -3,  -1,  -3,  -2,  -3,

  142.    -3,  -3,  -5,  -3,  -8,  -3, -13,  -3, -17,  -3,

  143.   -21,  -3,   0,  -5,   1,  -5,   2,  -5,   3,  -5,

  144.     5,  -5,   8,  -5,  13,  -5,  21,  -5,  -1,  -5,

  145.    -2,  -5,  -3,  -5,  -5,  -5,  -8,  -5, -13,  -5,

  146.   -17,  -5, -21,  -5,   0,  -8,   1,  -8,   2,  -8,

  147.     3,  -8,   5,  -8,   8,  -8,  13,  -8,  21,  -8,

  148.    -1,  -8,  -2,  -8,  -3,  -8,  -5,  -8,  -8,  -8,

  149.   -13,  -8, -17,  -8, -21,  -8,   0, -13,   1, -13,

  150.     2, -13,   3, -13,   5, -13,   8, -13,  13, -13,

  151.    21, -13,  -1, -13,  -2, -13,  -3, -13,  -5, -13,

  152.    -8, -13, -13, -13, -17, -13, -21, -13,   0, -17,

  153.     1, -17,   2, -17,   3, -17,   5, -17,   8, -17,

  154.    13, -17,  21, -17,  -1, -17,  -2, -17,  -3, -17,

  155.    -5, -17,  -8, -17, -13, -17, -17, -17, -21, -17,

  156.     0, -21,   1, -21,   2, -21,   3, -21,   5, -21,

  157.     8, -21,  13, -21,  21, -21,  -1, -21,  -2, -21,

  158.    -3, -21,  -5, -21,  -8, -21, -13, -21, -17, -21,

  159.     0,   0,  -8, -29,   8, -29, -18, -25,  17, -25,

  160.     0, -23,  -6, -22,   6, -22, -13, -19,  12, -19,

  161.     0, -18,  25, -18, -25, -17,  -5, -17,   5, -17,

  162.   -10, -15,  10, -15,   0, -14,  -4, -13,   4, -13,

  163.    19, -13, -19, -12,  -8, -11,  -2, -11,   0, -11,

  164.     2, -11,   8, -11, -15, -10,  -4, -10,   4, -10,

  165.    15, -10,  -6,  -9,  -1,  -9,   1,  -9,   6,  -9,

  166.   -29,  -8, -11,  -8,  -8,  -8,  -3,  -8,   3,  -8,

  167.     8,  -8,  11,  -8,  29,  -8,  -5,  -7,  -2,  -7,

  168.     0,  -7,   2,  -7,   5,  -7, -22,  -6,  -9,  -6,

  169.    -6,  -6,  -3,  -6,  -1,  -6,   1,  -6,   3,  -6,

  170.     6,  -6,   9,  -6,  22,  -6, -17,  -5,  -7,  -5,

  171.    -4,  -5,  -2,  -5,   0,  -5,   2,  -5,   4,  -5,

  172.     7,  -5,  17,  -5, -13,  -4, -10,  -4,  -5,  -4,

  173.    -3,  -4,  -1,  -4,   0,  -4,   1,  -4,   3,  -4,

  174.     5,  -4,  10,  -4,  13,  -4,  -8,  -3,  -6,  -3,

  175.    -4,  -3,  -3,  -3,  -2,  -3,  -1,  -3,   0,  -3,

  176.     1,  -3,   2,  -3,   4,  -3,   6,  -3,   8,  -3,

  177.   -11,  -2,  -7,  -2,  -5,  -2,  -3,  -2,  -2,  -2,

  178.    -1,  -2,   0,  -2,   1,  -2,   2,  -2,   3,  -2,

  179.     5,  -2,   7,  -2,  11,  -2,  -9,  -1,  -6,  -1,

  180.    -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,

  181.     1,  -1,   2,  -1,   3,  -1,   4,  -1,   6,  -1,

  182.     9,  -1, -31,   0, -23,   0, -18,   0, -14,   0,

  183.   -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,

  184.    -2,   0,  -1,   0,   0, -31,   1,   0,   2,   0,

  185.     3,   0,   4,   0,   5,   0,   7,   0,  11,   0,

  186.    14,   0,  18,   0,  23,   0,  31,   0,  -9,   1,

  187.    -6,   1,  -4,   1,  -3,   1,  -2,   1,  -1,   1,

  188.     0,   1,   1,   1,   2,   1,   3,   1,   4,   1,

  189.     6,   1,   9,   1, -11,   2,  -7,   2,  -5,   2,

  190.    -3,   2,  -2,   2,  -1,   2,   0,   2,   1,   2,

  191.     2,   2,   3,   2,   5,   2,   7,   2,  11,   2,

  192.    -8,   3,  -6,   3,  -4,   3,  -2,   3,  -1,   3,

  193.     0,   3,   1,   3,   2,   3,   3,   3,   4,   3,

  194.     6,   3,   8,   3, -13,   4, -10,   4,  -5,   4,

  195.    -3,   4,  -1,   4,   0,   4,   1,   4,   3,   4,

  196.     5,   4,  10,   4,  13,   4, -17,   5,  -7,   5,

  197.    -4,   5,  -2,   5,   0,   5,   2,   5,   4,   5,

  198.     7,   5,  17,   5, -22,   6,  -9,   6,  -6,   6,

  199.    -3,   6,  -1,   6,   1,   6,   3,   6,   6,   6,

  200.     9,   6,  22,   6,  -5,   7,  -2,   7,   0,   7,

  201.     2,   7,   5,   7, -29,   8, -11,   8,  -8,   8,

  202.    -3,   8,   3,   8,   8,   8,  11,   8,  29,   8,

  203.    -6,   9,  -1,   9,   1,   9,   6,   9, -15,  10,

  204.    -4,  10,   4,  10,  15,  10,  -8,  11,  -2,  11,

  205.     0,  11,   2,  11,   8,  11,  19,  12, -19,  13,

  206.    -4,  13,   4,  13,   0,  14, -10,  15,  10,  15,

  207.    -5,  17,   5,  17,  25,  17, -25,  18,   0,  18,

  208.   -12,  19,  13,  19,  -6,  22,   6,  22,   0,  23,

  209.   -17,  25,  18,  25,  -8,  29,   8,  29,   0,  31,

  210.     0,   0,  -6, -22,   6, -22, -13, -19,  12, -19,

  211.     0, -18,  -5, -17,   5, -17, -10, -15,  10, -15,

  212.     0, -14,  -4, -13,   4, -13,  19, -13, -19, -12,

  213.    -8, -11,  -2, -11,   0, -11,   2, -11,   8, -11,

  214.   -15, -10,  -4, -10,   4, -10,  15, -10,  -6,  -9,

  215.    -1,  -9,   1,  -9,   6,  -9, -11,  -8,  -8,  -8,

  216.    -3,  -8,   0,  -8,   3,  -8,   8,  -8,  11,  -8,

  217.    -5,  -7,  -2,  -7,   0,  -7,   2,  -7,   5,  -7,

  218.   -22,  -6,  -9,  -6,  -6,  -6,  -3,  -6,  -1,  -6,

  219.     1,  -6,   3,  -6,   6,  -6,   9,  -6,  22,  -6,

  220.   -17,  -5,  -7,  -5,  -4,  -5,  -2,  -5,  -1,  -5,

  221.     0,  -5,   1,  -5,   2,  -5,   4,  -5,   7,  -5,

  222.    17,  -5, -13,  -4, -10,  -4,  -5,  -4,  -3,  -4,

  223.    -2,  -4,  -1,  -4,   0,  -4,   1,  -4,   2,  -4,

  224.     3,  -4,   5,  -4,  10,  -4,  13,  -4,  -8,  -3,

  225.    -6,  -3,  -4,  -3,  -3,  -3,  -2,  -3,  -1,  -3,

  226.     0,  -3,   1,  -3,   2,  -3,   3,  -3,   4,  -3,

  227.     6,  -3,   8,  -3, -11,  -2,  -7,  -2,  -5,  -2,

  228.    -4,  -2,  -3,  -2,  -2,  -2,  -1,  -2,   0,  -2,

  229.     1,  -2,   2,  -2,   3,  -2,   4,  -2,   5,  -2,

  230.     7,  -2,  11,  -2,  -9,  -1,  -6,  -1,  -5,  -1,

  231.    -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,

  232.     1,  -1,   2,  -1,   3,  -1,   4,  -1,   5,  -1,

  233.     6,  -1,   9,  -1, -23,   0, -18,   0, -14,   0,

  234.   -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,

  235.    -2,   0,  -1,   0,   0, -23,   1,   0,   2,   0,

  236.     3,   0,   4,   0,   5,   0,   7,   0,  11,   0,

  237.    14,   0,  18,   0,  23,   0,  -9,   1,  -6,   1,

  238.    -5,   1,  -4,   1,  -3,   1,  -2,   1,  -1,   1,

  239.     0,   1,   1,   1,   2,   1,   3,   1,   4,   1,

  240.     5,   1,   6,   1,   9,   1, -11,   2,  -7,   2,

  241.    -5,   2,  -4,   2,  -3,   2,  -2,   2,  -1,   2,

  242.     0,   2,   1,   2,   2,   2,   3,   2,   4,   2,

  243.     5,   2,   7,   2,  11,   2,  -8,   3,  -6,   3,

  244.    -4,   3,  -3,   3,  -2,   3,  -1,   3,   0,   3,

  245.     1,   3,   2,   3,   3,   3,   4,   3,   6,   3,

  246.     8,   3, -13,   4, -10,   4,  -5,   4,  -3,   4,

  247.    -2,   4,  -1,   4,   0,   4,   1,   4,   2,   4,

  248.     3,   4,   5,   4,  10,   4,  13,   4, -17,   5,

  249.    -7,   5,  -4,   5,  -2,   5,  -1,   5,   0,   5,

  250.     1,   5,   2,   5,   4,   5,   7,   5,  17,   5,

  251.   -22,   6,  -9,   6,  -6,   6,  -3,   6,  -1,   6,

  252.     1,   6,   3,   6,   6,   6,   9,   6,  22,   6,

  253.    -5,   7,  -2,   7,   0,   7,   2,   7,   5,   7,

  254.   -11,   8,  -8,   8,  -3,   8,   0,   8,   3,   8,

  255.     8,   8,  11,   8,  -6,   9,  -1,   9,   1,   9,

  256.     6,   9, -15,  10,  -4,  10,   4,  10,  15,  10,

  257.    -8,  11,  -2,  11,   0,  11,   2,  11,   8,  11,

  258.    19,  12, -19,  13,  -4,  13,   4,  13,   0,  14,

  259.   -10,  15,  10,  15,  -5,  17,   5,  17,   0,  18,

  260.   -12,  19,  13,  19,  -6,  22,   6,  22,   0,  23,

  261. };

  262. 

  263. typedef struct SANMVideoContext {

  264.     AVCodecContext *avctx;

  265.     GetByteContext gb;

  266. 

  267.     int version, subversion;

  268.     uint32_t pal[PALETTE_SIZE];

  269.     int16_t delta_pal[PALETTE_DELTA];

  270. 

  271.     ptrdiff_t pitch;

  272.     int width, height;

  273.     int aligned_width, aligned_height;

  274.     int prev_seq;

  275. 

  276.     AVFrame *frame;

  277.     uint16_t *frm0, *frm1, *frm2;

  278.     uint8_t *stored_frame;

  279.     uint32_t frm0_size, frm1_size, frm2_size;

  280.     uint32_t stored_frame_size;

  281. 

  282.     uint8_t *rle_buf;

  283.     unsigned int rle_buf_size;

  284. 

  285.     int rotate_code;

  286. 

  287.     long npixels, buf_size;

  288. 

  289.     uint16_t codebook[256];

  290.     uint16_t small_codebook[4];

  291. 

  292.     int8_t p4x4glyphs[NGLYPHS][16];

  293.     int8_t p8x8glyphs[NGLYPHS][64];

  294. } SANMVideoContext;

  295. 

  296. typedef struct SANMFrameHeader {

  297.     int seq_num, codec, rotate_code, rle_output_size;

  298. 

  299.     uint16_t bg_color;

  300.     uint32_t width, height;

  301. } SANMFrameHeader;

  302. 

  303. enum GlyphEdge {

  304.     LEFT_EDGE,

  305.     TOP_EDGE,

  306.     RIGHT_EDGE,

  307.     BOTTOM_EDGE,

  308.     NO_EDGE

  309. };

  310. 

  311. enum GlyphDir {

  312.     DIR_LEFT,

  313.     DIR_UP,

  314.     DIR_RIGHT,

  315.     DIR_DOWN,

  316.     NO_DIR

  317. };

  318. 

  319. /**

  320.  * Return enum GlyphEdge of box where point (x, y) lies.

  321.  *

  322.  * @param x x point coordinate

  323.  * @param y y point coordinate

  324.  * @param edge_size box width/height.

  325.  */

  326. static enum GlyphEdge which_edge(int x, int y, int edge_size)

  327. {

  328.     const int edge_max = edge_size - 1;

  329. 

  330.     if (!y)

  331.         return BOTTOM_EDGE;

  332.     else if (y == edge_max)

  333.         return TOP_EDGE;

  334.     else if (!x)

  335.         return LEFT_EDGE;

  336.     else if (x == edge_max)

  337.         return RIGHT_EDGE;

  338.     else

  339.         return NO_EDGE;

  340. }

  341. 

  342. static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)

  343. {

  344.     if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||

  345.         (edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||

  346.         (edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||

  347.         (edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE))

  348.         return DIR_UP;

  349.     else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||

  350.              (edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE))

  351.         return DIR_DOWN;

  352.     else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||

  353.              (edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE))

  354.         return DIR_LEFT;

  355.     else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||

  356.              (edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||

  357.              (edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||

  358.              (edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE))

  359.         return DIR_RIGHT;

  360. 

  361.     return NO_DIR;

  362. }

  363. 

  364. /* Interpolate two points. */

  365. static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,

  366.                          int pos, int npoints)

  367. {

  368.     if (npoints) {

  369.         points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;

  370.         points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;

  371.     } else {

  372.         points[0] = x0;

  373.         points[1] = y0;

  374.     }

  375. }

  376. 

  377. /**

  378.  * Construct glyphs by iterating through vector coordinates.

  379.  *

  380.  * @param pglyphs pointer to table where glyphs are stored

  381.  * @param xvec pointer to x component of vector coordinates

  382.  * @param yvec pointer to y component of vector coordinates

  383.  * @param side_length glyph width/height.

  384.  */

  385. static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,

  386.                         const int side_length)

  387. {

  388.     const int glyph_size = side_length * side_length;

  389.     int8_t *pglyph = pglyphs;

  390. 

  391.     int i, j;

  392.     for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {

  393.         int x0 = xvec[i];

  394.         int y0 = yvec[i];

  395.         enum GlyphEdge edge0 = which_edge(x0, y0, side_length);

  396. 

  397.         for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {

  398.             int x1 = xvec[j];

  399.             int y1 = yvec[j];

  400.             enum GlyphEdge edge1 = which_edge(x1, y1, side_length);

  401.             enum GlyphDir dir = which_direction(edge0, edge1);

  402.             int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));

  403.             int ipoint;

  404. 

  405.             for (ipoint = 0; ipoint <= npoints; ipoint++) {

  406.                 int8_t point[2];

  407.                 int irow, icol;

  408. 

  409.                 interp_point(point, x0, y0, x1, y1, ipoint, npoints);

  410. 

  411.                 switch (dir) {

  412.                 case DIR_UP:

  413.                     for (irow = point[1]; irow >= 0; irow--)

  414.                         pglyph[point[0] + irow * side_length] = 1;

  415.                     break;

  416. 

  417.                 case DIR_DOWN:

  418.                     for (irow = point[1]; irow < side_length; irow++)

  419.                         pglyph[point[0] + irow * side_length] = 1;

  420.                     break;

  421. 

  422.                 case DIR_LEFT:

  423.                     for (icol = point[0]; icol >= 0; icol--)

  424.                         pglyph[icol + point[1] * side_length] = 1;

  425.                     break;

  426. 

  427.                 case DIR_RIGHT:

  428.                     for (icol = point[0]; icol < side_length; icol++)

  429.                         pglyph[icol + point[1] * side_length] = 1;

  430.                     break;

  431.                 }

  432.             }

  433.         }

  434.     }

  435. }

  436. 

  437. static void init_sizes(SANMVideoContext *ctx, int width, int height)

  438. {

  439.     ctx->width   = width;

  440.     ctx->height  = height;

  441.     ctx->npixels = width * height;

  442. 

  443.     ctx->aligned_width  = FFALIGN(width, 8);

  444.     ctx->aligned_height = FFALIGN(height, 8);

  445. 

  446.     ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);

  447.     ctx->pitch    = width;

  448. }

  449. 

  450. static void destroy_buffers(SANMVideoContext *ctx)

  451. {

  452.     av_freep(&ctx->frm0);

  453.     av_freep(&ctx->frm1);

  454.     av_freep(&ctx->frm2);

  455.     av_freep(&ctx->stored_frame);

  456.     av_freep(&ctx->rle_buf);

  457.     ctx->frm0_size =

  458.     ctx->frm1_size =

  459.     ctx->frm2_size = 0;

  460.     init_sizes(ctx, 0, 0);

  461. }

  462. 

  463. static av_cold int init_buffers(SANMVideoContext *ctx)

  464. {

  465.     av_fast_padded_mallocz(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);

  466.     av_fast_padded_mallocz(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);

  467.     av_fast_padded_mallocz(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);

  468.     if (!ctx->version)

  469.         av_fast_padded_mallocz(&ctx->stored_frame,

  470.                               &ctx->stored_frame_size, ctx->buf_size);

  471. 

  472.     if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 ||

  473.         (!ctx->stored_frame && !ctx->version)) {

  474.         destroy_buffers(ctx);

  475.         return AVERROR(ENOMEM);

  476.     }

  477. 

  478.     return 0;

  479. }

  480. 

  481. static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)

  482. {

  483.     if (rotate_code == 2)

  484.         FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);

  485.     FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);

  486. }

  487. 

  488. static av_cold int decode_init(AVCodecContext *avctx)

  489. {

  490.     SANMVideoContext *ctx = avctx->priv_data;

  491. 

  492.     ctx->avctx   = avctx;

  493.     ctx->version = !avctx->extradata_size;

  494. 

  495.     avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;

  496. 

  497.     init_sizes(ctx, avctx->width, avctx->height);

  498.     if (init_buffers(ctx)) {

  499.         av_log(avctx, AV_LOG_ERROR, "Error allocating buffers.\n");

  500.         return AVERROR(ENOMEM);

  501.     }

  502. 

  503.     make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);

  504.     make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);

  505. 

  506.     if (!ctx->version) {

  507.         int i;

  508. 

  509.         if (avctx->extradata_size < 1026) {

  510.             av_log(avctx, AV_LOG_ERROR, "Not enough extradata.\n");

  511.             return AVERROR_INVALIDDATA;

  512.         }

  513. 

  514.         ctx->subversion = AV_RL16(avctx->extradata);

  515.         for (i = 0; i < PALETTE_SIZE; i++)

  516.             ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);

  517.     }

  518. 

  519.     return 0;

  520. }

  521. 

  522. static av_cold int decode_end(AVCodecContext *avctx)

  523. {

  524.     SANMVideoContext *ctx = avctx->priv_data;

  525. 

  526.     destroy_buffers(ctx);

  527. 

  528.     return 0;

  529. }

  530. 

  531. static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)

  532. {

  533.     int opcode, color, run_len, left = out_size;

  534. 

  535.     while (left > 0) {

  536.         opcode = bytestream2_get_byte(&ctx->gb);

  537.         run_len = (opcode >> 1) + 1;

  538.         if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)

  539.             return AVERROR_INVALIDDATA;

  540. 

  541.         if (opcode & 1) {

  542.             color = bytestream2_get_byte(&ctx->gb);

  543.             memset(dst, color, run_len);

  544.         } else {

  545.             if (bytestream2_get_bytes_left(&ctx->gb) < run_len)

  546.                 return AVERROR_INVALIDDATA;

  547.             bytestream2_get_bufferu(&ctx->gb, dst, run_len);

  548.         }

  549. 

  550.         dst  += run_len;

  551.         left -= run_len;

  552.     }

  553. 

  554.     return 0;

  555. }

  556. 

  557. static int old_codec1(SANMVideoContext *ctx, int top,

  558.                       int left, int width, int height)

  559. {

  560.     uint8_t *dst = ((uint8_t *)ctx->frm0) + left + top * ctx->pitch;

  561.     int i, j, len, flag, code, val, pos, end;

  562. 

  563.     for (i = 0; i < height; i++) {

  564.         pos = 0;

  565. 

  566.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  567.             return AVERROR_INVALIDDATA;

  568. 

  569.         len = bytestream2_get_le16u(&ctx->gb);

  570.         end = bytestream2_tell(&ctx->gb) + len;

  571. 

  572.         while (bytestream2_tell(&ctx->gb) < end) {

  573.             if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  574.                 return AVERROR_INVALIDDATA;

  575. 

  576.             code = bytestream2_get_byteu(&ctx->gb);

  577.             flag = code & 1;

  578.             code = (code >> 1) + 1;

  579.             if (pos + code > width)

  580.                 return AVERROR_INVALIDDATA;

  581.             if (flag) {

  582.                 val = bytestream2_get_byteu(&ctx->gb);

  583.                 if (val)

  584.                     memset(dst + pos, val, code);

  585.                 pos += code;

  586.             } else {

  587.                 if (bytestream2_get_bytes_left(&ctx->gb) < code)

  588.                     return AVERROR_INVALIDDATA;

  589.                 for (j = 0; j < code; j++) {

  590.                     val = bytestream2_get_byteu(&ctx->gb);

  591.                     if (val)

  592.                         dst[pos] = val;

  593.                     pos++;

  594.                 }

  595.             }

  596.         }

  597.         dst += ctx->pitch;

  598.     }

  599.     ctx->rotate_code = 0;

  600. 

  601.     return 0;

  602. }

  603. 

  604. static inline void codec37_mv(uint8_t *dst, const uint8_t *src,

  605.                               int height, int stride, int x, int y)

  606. {

  607.     int pos, i, j;

  608. 

  609.     pos = x + y * stride;

  610.     for (j = 0; j < 4; j++) {

  611.         for (i = 0; i < 4; i++) {

  612.             if ((pos + i) < 0 || (pos + i) >= height * stride)

  613.                 dst[i] = 0;

  614.             else

  615.                 dst[i] = src[i];

  616.         }

  617.         dst += stride;

  618.         src += stride;

  619.         pos += stride;

  620.     }

  621. }

  622. 

  623. static int old_codec37(SANMVideoContext *ctx, int top,

  624.                        int left, int width, int height)

  625. {

  626.     ptrdiff_t stride = ctx->pitch;

  627.     int i, j, k, t;

  628.     uint8_t *dst, *prev;

  629.     int skip_run = 0;

  630.     int compr = bytestream2_get_byte(&ctx->gb);

  631.     int mvoff = bytestream2_get_byte(&ctx->gb);

  632.     int seq   = bytestream2_get_le16(&ctx->gb);

  633.     uint32_t decoded_size = bytestream2_get_le32(&ctx->gb);

  634.     int flags;

  635. 

  636.     bytestream2_skip(&ctx->gb, 4);

  637.     flags = bytestream2_get_byte(&ctx->gb);

  638.     bytestream2_skip(&ctx->gb, 3);

  639. 

  640.     if (decoded_size > ctx->height * stride - left - top * stride) {

  641.         decoded_size = ctx->height * stride - left - top * stride;

  642.         av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");

  643.     }

  644. 

  645.     ctx->rotate_code = 0;

  646. 

  647.     if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))

  648.         rotate_bufs(ctx, 1);

  649. 

  650.     dst  = ((uint8_t*)ctx->frm0) + left + top * stride;

  651.     prev = ((uint8_t*)ctx->frm2) + left + top * stride;

  652. 

  653.     if (mvoff > 2) {

  654.         av_log(ctx->avctx, AV_LOG_ERROR, "Invalid motion base value %d.\n", mvoff);

  655.         return AVERROR_INVALIDDATA;

  656.     }

  657. 

  658.     switch (compr) {

  659.     case 0:

  660.         for (i = 0; i < height; i++) {

  661.             bytestream2_get_buffer(&ctx->gb, dst, width);

  662.             dst += stride;

  663.         }

  664.         memset(ctx->frm1, 0, ctx->height * stride);

  665.         memset(ctx->frm2, 0, ctx->height * stride);

  666.         break;

  667.     case 2:

  668.         if (rle_decode(ctx, dst, decoded_size))

  669.             return AVERROR_INVALIDDATA;

  670.         memset(ctx->frm1, 0, ctx->frm1_size);

  671.         memset(ctx->frm2, 0, ctx->frm2_size);

  672.         break;

  673.     case 3:

  674.     case 4:

  675.         if (flags & 4) {

  676.             for (j = 0; j < height; j += 4) {

  677.                 for (i = 0; i < width; i += 4) {

  678.                     int code;

  679.                     if (skip_run) {

  680.                         skip_run--;

  681.                         copy_block4(dst + i, prev + i, stride, stride, 4);

  682.                         continue;

  683.                     }

  684.                     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  685.                         return AVERROR_INVALIDDATA;

  686.                     code = bytestream2_get_byteu(&ctx->gb);

  687.                     switch (code) {

  688.                     case 0xFF:

  689.                         if (bytestream2_get_bytes_left(&ctx->gb) < 16)

  690.                             return AVERROR_INVALIDDATA;

  691.                         for (k = 0; k < 4; k++)

  692.                             bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);

  693.                         break;

  694.                     case 0xFE:

  695.                         if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  696.                             return AVERROR_INVALIDDATA;

  697.                         for (k = 0; k < 4; k++)

  698.                             memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);

  699.                         break;

  700.                     case 0xFD:

  701.                         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  702.                             return AVERROR_INVALIDDATA;

  703.                         t = bytestream2_get_byteu(&ctx->gb);

  704.                         for (k = 0; k < 4; k++)

  705.                             memset(dst + i + k * stride, t, 4);

  706.                         break;

  707.                     default:

  708.                         if (compr == 4 && !code) {

  709.                             if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  710.                                 return AVERROR_INVALIDDATA;

  711.                             skip_run = bytestream2_get_byteu(&ctx->gb) + 1;

  712.                             i -= 4;

  713.                         } else {

  714.                             int mx, my;

  715. 

  716.                             mx = c37_mv[(mvoff * 255 + code) * 2];

  717.                             my = c37_mv[(mvoff * 255 + code) * 2 + 1];

  718.                             codec37_mv(dst + i, prev + i + mx + my * stride,

  719.                                        ctx->height, stride, i + mx, j + my);

  720.                         }

  721.                     }

  722.                 }

  723.                 dst  += stride * 4;

  724.                 prev += stride * 4;

  725.             }

  726.         } else {

  727.             for (j = 0; j < height; j += 4) {

  728.                 for (i = 0; i < width; i += 4) {

  729.                     int code;

  730.                     if (skip_run) {

  731.                         skip_run--;

  732.                         copy_block4(dst + i, prev + i, stride, stride, 4);

  733.                         continue;

  734.                     }

  735.                     code = bytestream2_get_byte(&ctx->gb);

  736.                     if (code == 0xFF) {

  737.                         if (bytestream2_get_bytes_left(&ctx->gb) < 16)

  738.                             return AVERROR_INVALIDDATA;

  739.                         for (k = 0; k < 4; k++)

  740.                             bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);

  741.                     } else if (compr == 4 && !code) {

  742.                         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  743.                             return AVERROR_INVALIDDATA;

  744.                         skip_run = bytestream2_get_byteu(&ctx->gb) + 1;

  745.                         i -= 4;

  746.                     } else {

  747.                         int mx, my;

  748. 

  749.                         mx = c37_mv[(mvoff * 255 + code) * 2];

  750.                         my = c37_mv[(mvoff * 255 + code) * 2 + 1];

  751.                         codec37_mv(dst + i, prev + i + mx + my * stride,

  752.                                    ctx->height, stride, i + mx, j + my);

  753.                     }

  754.                 }

  755.                 dst  += stride * 4;

  756.                 prev += stride * 4;

  757.             }

  758.         }

  759.         break;

  760.     default:

  761.         avpriv_report_missing_feature(ctx->avctx,

  762.                                       "Subcodec 37 compression %d", compr);

  763.         return AVERROR_PATCHWELCOME;

  764.     }

  765. 

  766.     return 0;

  767. }

  768. 

  769. static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,

  770.                          uint8_t *prev2, int stride, int tbl, int size)

  771. {

  772.     int code, k, t;

  773.     uint8_t colors[2];

  774.     int8_t *pglyph;

  775. 

  776.     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  777.         return AVERROR_INVALIDDATA;

  778. 

  779.     code = bytestream2_get_byteu(&ctx->gb);

  780.     if (code >= 0xF8) {

  781.         switch (code) {

  782.         case 0xFF:

  783.             if (size == 2) {

  784.                 if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  785.                     return AVERROR_INVALIDDATA;

  786.                 dst[0]          = bytestream2_get_byteu(&ctx->gb);

  787.                 dst[1]          = bytestream2_get_byteu(&ctx->gb);

  788.                 dst[0 + stride] = bytestream2_get_byteu(&ctx->gb);

  789.                 dst[1 + stride] = bytestream2_get_byteu(&ctx->gb);

  790.             } else {

  791.                 size >>= 1;

  792.                 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))

  793.                     return AVERROR_INVALIDDATA;

  794.                 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,

  795.                                   stride, tbl, size))

  796.                     return AVERROR_INVALIDDATA;

  797.                 dst   += size * stride;

  798.                 prev1 += size * stride;

  799.                 prev2 += size * stride;

  800.                 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))

  801.                     return AVERROR_INVALIDDATA;

  802.                 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,

  803.                                   stride, tbl, size))

  804.                     return AVERROR_INVALIDDATA;

  805.             }

  806.             break;

  807.         case 0xFE:

  808.             if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  809.                 return AVERROR_INVALIDDATA;

  810. 

  811.             t = bytestream2_get_byteu(&ctx->gb);

  812.             for (k = 0; k < size; k++)

  813.                 memset(dst + k * stride, t, size);

  814.             break;

  815.         case 0xFD:

  816.             if (bytestream2_get_bytes_left(&ctx->gb) < 3)

  817.                 return AVERROR_INVALIDDATA;

  818. 

  819.             code = bytestream2_get_byteu(&ctx->gb);

  820.             pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];

  821.             bytestream2_get_bufferu(&ctx->gb, colors, 2);

  822. 

  823.             for (k = 0; k < size; k++)

  824.                 for (t = 0; t < size; t++)

  825.                     dst[t + k * stride] = colors[!*pglyph++];

  826.             break;

  827.         case 0xFC:

  828.             for (k = 0; k < size; k++)

  829.                 memcpy(dst + k * stride, prev1 + k * stride, size);

  830.             break;

  831.         default:

  832.             k = bytestream2_tell(&ctx->gb);

  833.             bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);

  834.             t = bytestream2_get_byte(&ctx->gb);

  835.             bytestream2_seek(&ctx->gb, k, SEEK_SET);

  836.             for (k = 0; k < size; k++)

  837.                 memset(dst + k * stride, t, size);

  838.         }

  839.     } else {

  840.         int mx = motion_vectors[code][0];

  841.         int my = motion_vectors[code][1];

  842.         int index = prev2 - (const uint8_t *)ctx->frm2;

  843. 

  844.         av_assert2(index >= 0 && index < (ctx->buf_size >> 1));

  845. 

  846.         if (index < -mx - my * stride ||

  847.             (ctx->buf_size >> 1) - index < mx + size + (my + size - 1) * stride) {

  848.             av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid.\n");

  849.             return AVERROR_INVALIDDATA;

  850.         }

  851. 

  852.         for (k = 0; k < size; k++)

  853.             memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);

  854.     }

  855. 

  856.     return 0;

  857. }

  858. 

  859. static int old_codec47(SANMVideoContext *ctx, int top,

  860.                        int left, int width, int height)

  861. {

  862.     uint32_t decoded_size;

  863.     int i, j;

  864.     ptrdiff_t stride = ctx->pitch;

  865.     uint8_t *dst   = (uint8_t *)ctx->frm0 + left + top * stride;

  866.     uint8_t *prev1 = (uint8_t *)ctx->frm1;

  867.     uint8_t *prev2 = (uint8_t *)ctx->frm2;

  868.     int tbl_pos = bytestream2_tell(&ctx->gb);

  869.     int seq     = bytestream2_get_le16(&ctx->gb);

  870.     int compr   = bytestream2_get_byte(&ctx->gb);

  871.     int new_rot = bytestream2_get_byte(&ctx->gb);

  872.     int skip    = bytestream2_get_byte(&ctx->gb);

  873. 

  874.     bytestream2_skip(&ctx->gb, 9);

  875.     decoded_size = bytestream2_get_le32(&ctx->gb);

  876.     bytestream2_skip(&ctx->gb, 8);

  877. 

  878.     if (decoded_size > ctx->height * stride - left - top * stride) {

  879.         decoded_size = ctx->height * stride - left - top * stride;

  880.         av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");

  881.     }

  882. 

  883.     if (skip & 1)

  884.         bytestream2_skip(&ctx->gb, 0x8080);

  885.     if (!seq) {

  886.         ctx->prev_seq = -1;

  887.         memset(prev1, 0, ctx->height * stride);

  888.         memset(prev2, 0, ctx->height * stride);

  889.     }

  890. 

  891.     switch (compr) {

  892.     case 0:

  893.         if (bytestream2_get_bytes_left(&ctx->gb) < width * height)

  894.             return AVERROR_INVALIDDATA;

  895.         for (j = 0; j < height; j++) {

  896.             bytestream2_get_bufferu(&ctx->gb, dst, width);

  897.             dst += stride;

  898.         }

  899.         break;

  900.     case 1:

  901.         if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))

  902.             return AVERROR_INVALIDDATA;

  903.         for (j = 0; j < height; j += 2) {

  904.             for (i = 0; i < width; i += 2) {

  905.                 dst[i] =

  906.                 dst[i + 1] =

  907.                 dst[stride + i] =

  908.                 dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);

  909.             }

  910.             dst += stride * 2;

  911.         }

  912.         break;

  913.     case 2:

  914.         if (seq == ctx->prev_seq + 1) {

  915.             for (j = 0; j < height; j += 8) {

  916.                 for (i = 0; i < width; i += 8)

  917.                     if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,

  918.                                       tbl_pos + 8, 8))

  919.                         return AVERROR_INVALIDDATA;

  920.                 dst   += stride * 8;

  921.                 prev1 += stride * 8;

  922.                 prev2 += stride * 8;

  923.             }

  924.         }

  925.         break;

  926.     case 3:

  927.         memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);

  928.         break;

  929.     case 4:

  930.         memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);

  931.         break;

  932.     case 5:

  933.         if (rle_decode(ctx, dst, decoded_size))

  934.             return AVERROR_INVALIDDATA;

  935.         break;

  936.     default:

  937.         avpriv_report_missing_feature(ctx->avctx,

  938.                                       "Subcodec 47 compression %d", compr);

  939.         return AVERROR_PATCHWELCOME;

  940.     }

  941.     if (seq == ctx->prev_seq + 1)

  942.         ctx->rotate_code = new_rot;

  943.     else

  944.         ctx->rotate_code = 0;

  945.     ctx->prev_seq = seq;

  946. 

  947.     return 0;

  948. }

  949. 

  950. static int process_frame_obj(SANMVideoContext *ctx)

  951. {

  952.     uint16_t codec = bytestream2_get_le16u(&ctx->gb);

  953.     uint16_t left  = bytestream2_get_le16u(&ctx->gb);

  954.     uint16_t top   = bytestream2_get_le16u(&ctx->gb);

  955.     uint16_t w     = bytestream2_get_le16u(&ctx->gb);

  956.     uint16_t h     = bytestream2_get_le16u(&ctx->gb);

  957. 

  958.     if (!w || !h) {

  959.         av_log(ctx->avctx, AV_LOG_ERROR, "Dimensions are invalid.\n");

  960.         return AVERROR_INVALIDDATA;

  961.     }

  962. 

  963.     if (ctx->width < left + w || ctx->height < top + h) {

  964.         int ret = ff_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),

  965.                                     FFMAX(top + h, ctx->height));

  966.         if (ret < 0)

  967.             return ret;

  968.         init_sizes(ctx, FFMAX(left + w, ctx->width),

  969.                    FFMAX(top + h, ctx->height));

  970.         if (init_buffers(ctx)) {

  971.             av_log(ctx->avctx, AV_LOG_ERROR, "Error resizing buffers.\n");

  972.             return AVERROR(ENOMEM);

  973.         }

  974.     }

  975.     bytestream2_skip(&ctx->gb, 4);

  976. 

  977.     switch (codec) {

  978.     case 1:

  979.     case 3:

  980.         return old_codec1(ctx, top, left, w, h);

  981.     case 37:

  982.         return old_codec37(ctx, top, left, w, h);

  983.     case 47:

  984.         return old_codec47(ctx, top, left, w, h);

  985.     default:

  986.         avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);

  987.         return AVERROR_PATCHWELCOME;

  988.     }

  989. }

  990. 

  991. static int decode_0(SANMVideoContext *ctx)

  992. {

  993.     uint16_t *frm = ctx->frm0;

  994.     int x, y;

  995. 

  996.     if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {

  997.         av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for raw frame.\n");

  998.         return AVERROR_INVALIDDATA;

  999.     }

  1000.     for (y = 0; y < ctx->height; y++) {

  1001.         for (x = 0; x < ctx->width; x++)

  1002.             frm[x] = bytestream2_get_le16u(&ctx->gb);

  1003.         frm += ctx->pitch;

  1004.     }

  1005.     return 0;

  1006. }

  1007. 

  1008. static int decode_nop(SANMVideoContext *ctx)

  1009. {

  1010.     avpriv_request_sample(ctx->avctx, "Unknown/unsupported compression type");

  1011.     return AVERROR_PATCHWELCOME;

  1012. }

  1013. 

  1014. static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, ptrdiff_t pitch)

  1015. {

  1016.     uint8_t *dst = (uint8_t *)pdest;

  1017.     uint8_t *src = (uint8_t *)psrc;

  1018.     ptrdiff_t stride = pitch * 2;

  1019. 

  1020.     switch (block_size) {

  1021.     case 2:

  1022.         copy_block4(dst, src, stride, stride, 2);

  1023.         break;

  1024.     case 4:

  1025.         copy_block8(dst, src, stride, stride, 4);

  1026.         break;

  1027.     case 8:

  1028.         copy_block16(dst, src, stride, stride, 8);

  1029.         break;

  1030.     }

  1031. }

  1032. 

  1033. static void fill_block(uint16_t *pdest, uint16_t color, int block_size, ptrdiff_t pitch)

  1034. {

  1035.     int x, y;

  1036. 

  1037.     pitch -= block_size;

  1038.     for (y = 0; y < block_size; y++, pdest += pitch)

  1039.         for (x = 0; x < block_size; x++)

  1040.             *pdest++ = color;

  1041. }

  1042. 

  1043. static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index,

  1044.                       uint16_t fg_color, uint16_t bg_color, int block_size,

  1045.                       ptrdiff_t pitch)

  1046. {

  1047.     int8_t *pglyph;

  1048.     uint16_t colors[2] = { fg_color, bg_color };

  1049.     int x, y;

  1050. 

  1051.     if (index >= NGLYPHS) {

  1052.         av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);

  1053.         return AVERROR_INVALIDDATA;

  1054.     }

  1055. 

  1056.     pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];

  1057.     pitch -= block_size;

  1058. 

  1059.     for (y = 0; y < block_size; y++, dst += pitch)

  1060.         for (x = 0; x < block_size; x++)

  1061.             *dst++ = colors[*pglyph++];

  1062.     return 0;

  1063. }

  1064. 

  1065. static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)

  1066. {

  1067.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  1068. 

  1069.     if (block_size == 2) {

  1070.         uint32_t indices;

  1071. 

  1072.         if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  1073.             return AVERROR_INVALIDDATA;

  1074. 

  1075.         indices        = bytestream2_get_le32u(&ctx->gb);

  1076.         dst[0]         = ctx->codebook[indices & 0xFF];

  1077.         indices      >>= 8;

  1078.         dst[1]         = ctx->codebook[indices & 0xFF];

  1079.         indices      >>= 8;

  1080.         dst[pitch]     = ctx->codebook[indices & 0xFF];

  1081.         indices      >>= 8;

  1082.         dst[pitch + 1] = ctx->codebook[indices & 0xFF];

  1083.     } else {

  1084.         uint16_t fgcolor, bgcolor;

  1085.         int glyph;

  1086. 

  1087.         if (bytestream2_get_bytes_left(&ctx->gb) < 3)

  1088.             return AVERROR_INVALIDDATA;

  1089. 

  1090.         glyph   = bytestream2_get_byteu(&ctx->gb);

  1091.         bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1092.         fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1093. 

  1094.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  1095.     }

  1096.     return 0;

  1097. }

  1098. 

  1099. static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)

  1100. {

  1101.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  1102. 

  1103.     if (block_size == 2) {

  1104.         if (bytestream2_get_bytes_left(&ctx->gb) < 8)

  1105.             return AVERROR_INVALIDDATA;

  1106. 

  1107.         dst[0]         = bytestream2_get_le16u(&ctx->gb);

  1108.         dst[1]         = bytestream2_get_le16u(&ctx->gb);

  1109.         dst[pitch]     = bytestream2_get_le16u(&ctx->gb);

  1110.         dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);

  1111.     } else {

  1112.         uint16_t fgcolor, bgcolor;

  1113.         int glyph;

  1114. 

  1115.         if (bytestream2_get_bytes_left(&ctx->gb) < 5)

  1116.             return AVERROR_INVALIDDATA;

  1117. 

  1118.         glyph   = bytestream2_get_byteu(&ctx->gb);

  1119.         bgcolor = bytestream2_get_le16u(&ctx->gb);

  1120.         fgcolor = bytestream2_get_le16u(&ctx->gb);

  1121. 

  1122.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  1123.     }

  1124.     return 0;

  1125. }

  1126. 

  1127. static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,

  1128.                      int block_size)

  1129. {

  1130.     int start_pos = cx + mx + (cy + my) * ctx->pitch;

  1131.     int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);

  1132. 

  1133.     int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);

  1134. 

  1135.     if (!good)

  1136.         av_log(ctx->avctx, AV_LOG_ERROR,

  1137.                "Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",

  1138.                cx + mx, cy + my, cx, cy, block_size);

  1139. 

  1140.     return good;

  1141. }

  1142. 

  1143. static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)

  1144. {

  1145.     int16_t mx, my, index;

  1146.     int opcode;

  1147. 

  1148.     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  1149.         return AVERROR_INVALIDDATA;

  1150. 

  1151.     opcode = bytestream2_get_byteu(&ctx->gb);

  1152. 

  1153.     switch (opcode) {

  1154.     default:

  1155.         mx = motion_vectors[opcode][0];

  1156.         my = motion_vectors[opcode][1];

  1157. 

  1158.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  1159.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  1160.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  1161.                        blk_size, ctx->pitch);

  1162.         }

  1163.         break;

  1164.     case 0xF5:

  1165.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  1166.             return AVERROR_INVALIDDATA;

  1167.         index = bytestream2_get_le16u(&ctx->gb);

  1168. 

  1169.         mx = index % ctx->width;

  1170.         my = index / ctx->width;

  1171. 

  1172.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  1173.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  1174.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  1175.                        blk_size, ctx->pitch);

  1176.         }

  1177.         break;

  1178.     case 0xF6:

  1179.         copy_block(ctx->frm0 + cx + ctx->pitch * cy,

  1180.                    ctx->frm1 + cx + ctx->pitch * cy,

  1181.                    blk_size, ctx->pitch);

  1182.         break;

  1183.     case 0xF7:

  1184.         opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);

  1185.         break;

  1186. 

  1187.     case 0xF8:

  1188.         opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  1189.         break;

  1190.     case 0xF9:

  1191.     case 0xFA:

  1192.     case 0xFB:

  1193.     case 0xFC:

  1194.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1195.                    ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);

  1196.         break;

  1197.     case 0xFD:

  1198.         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  1199.             return AVERROR_INVALIDDATA;

  1200.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1201.                    ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);

  1202.         break;

  1203.     case 0xFE:

  1204.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  1205.             return AVERROR_INVALIDDATA;

  1206.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1207.                    bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);

  1208.         break;

  1209.     case 0xFF:

  1210.         if (blk_size == 2) {

  1211.             opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  1212.         } else {

  1213.             blk_size >>= 1;

  1214.             if (codec2subblock(ctx, cx, cy, blk_size))

  1215.                 return AVERROR_INVALIDDATA;

  1216.             if (codec2subblock(ctx, cx + blk_size, cy, blk_size))

  1217.                 return AVERROR_INVALIDDATA;

  1218.             if (codec2subblock(ctx, cx, cy + blk_size, blk_size))

  1219.                 return AVERROR_INVALIDDATA;

  1220.             if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))

  1221.                 return AVERROR_INVALIDDATA;

  1222.         }

  1223.         break;

  1224.     }

  1225.     return 0;

  1226. }

  1227. 

  1228. static int decode_2(SANMVideoContext *ctx)

  1229. {

  1230.     int cx, cy, ret;

  1231. 

  1232.     for (cy = 0; cy < ctx->aligned_height; cy += 8)

  1233.         for (cx = 0; cx < ctx->aligned_width; cx += 8)

  1234.             if (ret = codec2subblock(ctx, cx, cy, 8))

  1235.                 return ret;

  1236. 

  1237.     return 0;

  1238. }

  1239. 

  1240. static int decode_3(SANMVideoContext *ctx)

  1241. {

  1242.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1243.     return 0;

  1244. }

  1245. 

  1246. static int decode_4(SANMVideoContext *ctx)

  1247. {

  1248.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1249.     return 0;

  1250. }

  1251. 

  1252. static int decode_5(SANMVideoContext *ctx)

  1253. {

  1254. #if HAVE_BIGENDIAN

  1255.     uint16_t *frm;

  1256.     int npixels;

  1257. #endif

  1258.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1259. 

  1260.     if (rle_decode(ctx, dst, ctx->buf_size))

  1261.         return AVERROR_INVALIDDATA;

  1262. 

  1263. #if HAVE_BIGENDIAN

  1264.     npixels = ctx->npixels;

  1265.     frm = ctx->frm0;

  1266.     while (npixels--) {

  1267.         *frm = av_bswap16(*frm);

  1268.         frm++;

  1269.     }

  1270. #endif

  1271. 

  1272.     return 0;

  1273. }

  1274. 

  1275. static int decode_6(SANMVideoContext *ctx)

  1276. {

  1277.     int npixels = ctx->npixels;

  1278.     uint16_t *frm = ctx->frm0;

  1279. 

  1280.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1281.         av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");

  1282.         return AVERROR_INVALIDDATA;

  1283.     }

  1284.     while (npixels--)

  1285.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1286. 

  1287.     return 0;

  1288. }

  1289. 

  1290. static int decode_8(SANMVideoContext *ctx)

  1291. {

  1292.     uint16_t *pdest = ctx->frm0;

  1293.     uint8_t *rsrc;

  1294.     long npixels = ctx->npixels;

  1295. 

  1296.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1297.     if (!ctx->rle_buf) {

  1298.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");

  1299.         return AVERROR(ENOMEM);

  1300.     }

  1301.     rsrc = ctx->rle_buf;

  1302. 

  1303.     if (rle_decode(ctx, rsrc, npixels))

  1304.         return AVERROR_INVALIDDATA;

  1305. 

  1306.     while (npixels--)

  1307.         *pdest++ = ctx->codebook[*rsrc++];

  1308. 

  1309.     return 0;

  1310. }

  1311. 

  1312. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1313. 

  1314. static const frm_decoder v1_decoders[] = {

  1315.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1316.     decode_6, decode_nop, decode_8

  1317. };

  1318. 

  1319. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1320. {

  1321.     int i, ret;

  1322. 

  1323.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1324.         av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",

  1325.                ret);

  1326.         return AVERROR_INVALIDDATA;

  1327.     }

  1328.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1329. 

  1330.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1331.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1332. 

  1333.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1334.         avpriv_report_missing_feature(ctx->avctx, "Variable size frames");

  1335.         return AVERROR_PATCHWELCOME;

  1336.     }

  1337. 

  1338.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1339.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1340.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1341. 

  1342.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1343. 

  1344.     for (i = 0; i < 4; i++)

  1345.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1346.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1347. 

  1348.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1349. 

  1350.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1351.     for (i = 0; i < 256; i++)

  1352.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1353. 

  1354.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1355. 

  1356.     return 0;

  1357. }

  1358. 

  1359. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1360. {

  1361.     if (buf_size--) {

  1362.         *pbuf++ = color;

  1363.         av_memcpy_backptr((uint8_t*)pbuf, 2, 2*buf_size);

  1364.     }

  1365. }

  1366. 

  1367. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1368. {

  1369.     uint8_t *dst;

  1370.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1371.     int ret, height = ctx->height;

  1372.     ptrdiff_t dstpitch, srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1373. 

  1374.     if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)

  1375.         return ret;

  1376. 

  1377.     dst      = ctx->frame->data[0];

  1378.     dstpitch = ctx->frame->linesize[0];

  1379. 

  1380.     while (height--) {

  1381.         memcpy(dst, src, srcpitch);

  1382.         src += srcpitch;

  1383.         dst += dstpitch;

  1384.     }

  1385. 

  1386.     return 0;

  1387. }

  1388. 

  1389. static int decode_frame(AVCodecContext *avctx, void *data,

  1390.                         int *got_frame_ptr, AVPacket *pkt)

  1391. {

  1392.     SANMVideoContext *ctx = avctx->priv_data;

  1393.     int i, ret;

  1394. 

  1395.     ctx->frame = data;

  1396.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1397. 

  1398.     if (!ctx->version) {

  1399.         int to_store = 0;

  1400. 

  1401.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1402.             uint32_t sig, size;

  1403.             int pos;

  1404. 

  1405.             sig  = bytestream2_get_be32u(&ctx->gb);

  1406.             size = bytestream2_get_be32u(&ctx->gb);

  1407.             pos  = bytestream2_tell(&ctx->gb);

  1408. 

  1409.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1410.                 av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %"PRIu32".\n", size);

  1411.                 break;

  1412.             }

  1413.             switch (sig) {

  1414.             case MKBETAG('N', 'P', 'A', 'L'):

  1415.                 if (size != PALETTE_SIZE * 3) {

  1416.                     av_log(avctx, AV_LOG_ERROR,

  1417.                            "Incorrect palette block size %"PRIu32".\n", size);

  1418.                     return AVERROR_INVALIDDATA;

  1419.                 }

  1420.                 for (i = 0; i < PALETTE_SIZE; i++)

  1421.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1422.                 break;

  1423.             case MKBETAG('F', 'O', 'B', 'J'):

  1424.                 if (size < 16)

  1425.                     return AVERROR_INVALIDDATA;

  1426.                 if (ret = process_frame_obj(ctx))

  1427.                     return ret;

  1428.                 break;

  1429.             case MKBETAG('X', 'P', 'A', 'L'):

  1430.                 if (size == 6 || size == 4) {

  1431.                     uint8_t tmp[3];

  1432.                     int j;

  1433. 

  1434.                     for (i = 0; i < PALETTE_SIZE; i++) {

  1435.                         for (j = 0; j < 3; j++) {

  1436.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1437.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1438.                         }

  1439.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1440.                     }

  1441.                 } else {

  1442.                     if (size < PALETTE_DELTA * 2 + 4) {

  1443.                         av_log(avctx, AV_LOG_ERROR,

  1444.                                "Incorrect palette change block size %"PRIu32".\n",

  1445.                                size);

  1446.                         return AVERROR_INVALIDDATA;

  1447.                     }

  1448.                     bytestream2_skipu(&ctx->gb, 4);

  1449.                     for (i = 0; i < PALETTE_DELTA; i++)

  1450.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1451.                     if (size >= PALETTE_DELTA * 5 + 4) {

  1452.                         for (i = 0; i < PALETTE_SIZE; i++)

  1453.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1454.                     } else {

  1455.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1456.                     }

  1457.                 }

  1458.                 break;

  1459.             case MKBETAG('S', 'T', 'O', 'R'):

  1460.                 to_store = 1;

  1461.                 break;

  1462.             case MKBETAG('F', 'T', 'C', 'H'):

  1463.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1464.                 break;

  1465.             default:

  1466.                 bytestream2_skip(&ctx->gb, size);

  1467.                 av_log(avctx, AV_LOG_DEBUG,

  1468.                        "Unknown/unsupported chunk %"PRIx32".\n", sig);

  1469.                 break;

  1470.             }

  1471. 

  1472.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1473.             if (size & 1)

  1474.                 bytestream2_skip(&ctx->gb, 1);

  1475.         }

  1476.         if (to_store)

  1477.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1478.         if ((ret = copy_output(ctx, NULL)))

  1479.             return ret;

  1480.         memcpy(ctx->frame->data[1], ctx->pal, 1024);

  1481.     } else {

  1482.         SANMFrameHeader header;

  1483. 

  1484.         if ((ret = read_frame_header(ctx, &header)))

  1485.             return ret;

  1486. 

  1487.         ctx->rotate_code = header.rotate_code;

  1488.         if ((ctx->frame->key_frame = !header.seq_num)) {

  1489.             ctx->frame->pict_type = AV_PICTURE_TYPE_I;

  1490.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1491.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1492.         } else {

  1493.             ctx->frame->pict_type = AV_PICTURE_TYPE_P;

  1494.         }

  1495. 

  1496.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1497.             if ((ret = v1_decoders[header.codec](ctx))) {

  1498.                 av_log(avctx, AV_LOG_ERROR,

  1499.                        "Subcodec %d: error decoding frame.\n", header.codec);

  1500.                 return ret;

  1501.             }

  1502.         } else {

  1503.             avpriv_request_sample(avctx, "Subcodec %d", header.codec);

  1504.             return AVERROR_PATCHWELCOME;

  1505.         }

  1506. 

  1507.         if ((ret = copy_output(ctx, &header)))

  1508.             return ret;

  1509.     }

  1510.     if (ctx->rotate_code)

  1511.         rotate_bufs(ctx, ctx->rotate_code);

  1512. 

  1513.     *got_frame_ptr = 1;

  1514. 

  1515.     return pkt->size;

  1516. }

  1517. 

  1518. AVCodec ff_sanm_decoder = {

  1519.     .name           = "sanm",

  1520.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SANM/Smush video"),

  1521.     .type           = AVMEDIA_TYPE_VIDEO,

  1522.     .id             = AV_CODEC_ID_SANM,

  1523.     .priv_data_size = sizeof(SANMVideoContext),

  1524.     .init           = decode_init,

  1525.     .close          = decode_end,

  1526.     .decode         = decode_frame,

  1527.     .capabilities   = AV_CODEC_CAP_DR1,

  1528. };