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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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,   8,   0,  13,   0,  21,

  109.     0,  -1,   0,  -2,   0,  -3,   0,  -5,   0,  -8,   0, -13,   0, -17,   0,

  110.   -21,   0,   0,   1,   1,   1,   2,   1,   3,   1,   5,   1,   8,   1,  13,

  111.     1,  21,   1,  -1,   1,  -2,   1,  -3,   1,  -5,   1,  -8,   1, -13,   1,

  112.   -17,   1, -21,   1,   0,   2,   1,   2,   2,   2,   3,   2,   5,   2,   8,

  113.     2,  13,   2,  21,   2,  -1,   2,  -2,   2,  -3,   2,  -5,   2,  -8,   2,

  114.   -13,   2, -17,   2, -21,   2,   0,   3,   1,   3,   2,   3,   3,   3,   5,

  115.     3,   8,   3,  13,   3,  21,   3,  -1,   3,  -2,   3,  -3,   3,  -5,   3,

  116.    -8,   3, -13,   3, -17,   3, -21,   3,   0,   5,   1,   5,   2,   5,   3,

  117.     5,   5,   5,   8,   5,  13,   5,  21,   5,  -1,   5,  -2,   5,  -3,   5,

  118.    -5,   5,  -8,   5, -13,   5, -17,   5, -21,   5,   0,   8,   1,   8,   2,

  119.     8,   3,   8,   5,   8,   8,   8,  13,   8,  21,   8,  -1,   8,  -2,   8,

  120.    -3,   8,  -5,   8,  -8,   8, -13,   8, -17,   8, -21,   8,   0,  13,   1,

  121.    13,   2,  13,   3,  13,   5,  13,   8,  13,  13,  13,  21,  13,  -1,  13,

  122.    -2,  13,  -3,  13,  -5,  13,  -8,  13, -13,  13, -17,  13, -21,  13,   0,

  123.    21,   1,  21,   2,  21,   3,  21,   5,  21,   8,  21,  13,  21,  21,  21,

  124.    -1,  21,  -2,  21,  -3,  21,  -5,  21,  -8,  21, -13,  21, -17,  21, -21,

  125.    21,   0,  -1,   1,  -1,   2,  -1,   3,  -1,   5,  -1,   8,  -1,  13,  -1,

  126.    21,  -1,  -1,  -1,  -2,  -1,  -3,  -1,  -5,  -1,  -8,  -1, -13,  -1, -17,

  127.    -1, -21,  -1,   0,  -2,   1,  -2,   2,  -2,   3,  -2,   5,  -2,   8,  -2,

  128.    13,  -2,  21,  -2,  -1,  -2,  -2,  -2,  -3,  -2,  -5,  -2,  -8,  -2, -13,

  129.    -2, -17,  -2, -21,  -2,   0,  -3,   1,  -3,   2,  -3,   3,  -3,   5,  -3,

  130.     8,  -3,  13,  -3,  21,  -3,  -1,  -3,  -2,  -3,  -3,  -3,  -5,  -3,  -8,

  131.    -3, -13,  -3, -17,  -3, -21,  -3,   0,  -5,   1,  -5,   2,  -5,   3,  -5,

  132.     5,  -5,   8,  -5,  13,  -5,  21,  -5,  -1,  -5,  -2,  -5,  -3,  -5,  -5,

  133.    -5,  -8,  -5, -13,  -5, -17,  -5, -21,  -5,   0,  -8,   1,  -8,   2,  -8,

  134.     3,  -8,   5,  -8,   8,  -8,  13,  -8,  21,  -8,  -1,  -8,  -2,  -8,  -3,

  135.    -8,  -5,  -8,  -8,  -8, -13,  -8, -17,  -8, -21,  -8,   0, -13,   1, -13,

  136.     2, -13,   3, -13,   5, -13,   8, -13,  13, -13,  21, -13,  -1, -13,  -2,

  137.   -13,  -3, -13,  -5, -13,  -8, -13, -13, -13, -17, -13, -21, -13,   0, -17,

  138.     1, -17,   2, -17,   3, -17,   5, -17,   8, -17,  13, -17,  21, -17,  -1,

  139.   -17,  -2, -17,  -3, -17,  -5, -17,  -8, -17, -13, -17, -17, -17, -21, -17,

  140.     0, -21,   1, -21,   2, -21,   3, -21,   5, -21,   8, -21,  13, -21,  21,

  141.   -21,  -1, -21,  -2, -21,  -3, -21,  -5, -21,  -8, -21, -13, -21, -17, -21,

  142.     0,   0,  -8, -29,   8, -29, -18, -25,  17, -25,   0, -23,  -6, -22,   6,

  143.   -22, -13, -19,  12, -19,   0, -18,  25, -18, -25, -17,  -5, -17,   5, -17,

  144.   -10, -15,  10, -15,   0, -14,  -4, -13,   4, -13,  19, -13, -19, -12,  -8,

  145.   -11,  -2, -11,   0, -11,   2, -11,   8, -11, -15, -10,  -4, -10,   4, -10,

  146.    15, -10,  -6,  -9,  -1,  -9,   1,  -9,   6,  -9, -29,  -8, -11,  -8,  -8,

  147.    -8,  -3,  -8,   3,  -8,   8,  -8,  11,  -8,  29,  -8,  -5,  -7,  -2,  -7,

  148.     0,  -7,   2,  -7,   5,  -7, -22,  -6,  -9,  -6,  -6,  -6,  -3,  -6,  -1,

  149.    -6,   1,  -6,   3,  -6,   6,  -6,   9,  -6,  22,  -6, -17,  -5,  -7,  -5,

  150.    -4,  -5,  -2,  -5,   0,  -5,   2,  -5,   4,  -5,   7,  -5,  17,  -5, -13,

  151.    -4, -10,  -4,  -5,  -4,  -3,  -4,  -1,  -4,   0,  -4,   1,  -4,   3,  -4,

  152.     5,  -4,  10,  -4,  13,  -4,  -8,  -3,  -6,  -3,  -4,  -3,  -3,  -3,  -2,

  153.    -3,  -1,  -3,   0,  -3,   1,  -3,   2,  -3,   4,  -3,   6,  -3,   8,  -3,

  154.   -11,  -2,  -7,  -2,  -5,  -2,  -3,  -2,  -2,  -2,  -1,  -2,   0,  -2,   1,

  155.    -2,   2,  -2,   3,  -2,   5,  -2,   7,  -2,  11,  -2,  -9,  -1,  -6,  -1,

  156.    -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,   1,  -1,   2,  -1,   3,

  157.    -1,   4,  -1,   6,  -1,   9,  -1, -31,   0, -23,   0, -18,   0, -14,   0,

  158.   -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,  -2,   0,  -1,   0,   0,

  159.   -31,   1,   0,   2,   0,   3,   0,   4,   0,   5,   0,   7,   0,  11,   0,

  160.    14,   0,  18,   0,  23,   0,  31,   0,  -9,   1,  -6,   1,  -4,   1,  -3,

  161.     1,  -2,   1,  -1,   1,   0,   1,   1,   1,   2,   1,   3,   1,   4,   1,

  162.     6,   1,   9,   1, -11,   2,  -7,   2,  -5,   2,  -3,   2,  -2,   2,  -1,

  163.     2,   0,   2,   1,   2,   2,   2,   3,   2,   5,   2,   7,   2,  11,   2,

  164.    -8,   3,  -6,   3,  -4,   3,  -2,   3,  -1,   3,   0,   3,   1,   3,   2,

  165.     3,   3,   3,   4,   3,   6,   3,   8,   3, -13,   4, -10,   4,  -5,   4,

  166.    -3,   4,  -1,   4,   0,   4,   1,   4,   3,   4,   5,   4,  10,   4,  13,

  167.     4, -17,   5,  -7,   5,  -4,   5,  -2,   5,   0,   5,   2,   5,   4,   5,

  168.     7,   5,  17,   5, -22,   6,  -9,   6,  -6,   6,  -3,   6,  -1,   6,   1,

  169.     6,   3,   6,   6,   6,   9,   6,  22,   6,  -5,   7,  -2,   7,   0,   7,

  170.     2,   7,   5,   7, -29,   8, -11,   8,  -8,   8,  -3,   8,   3,   8,   8,

  171.     8,  11,   8,  29,   8,  -6,   9,  -1,   9,   1,   9,   6,   9, -15,  10,

  172.    -4,  10,   4,  10,  15,  10,  -8,  11,  -2,  11,   0,  11,   2,  11,   8,

  173.    11,  19,  12, -19,  13,  -4,  13,   4,  13,   0,  14, -10,  15,  10,  15,

  174.    -5,  17,   5,  17,  25,  17, -25,  18,   0,  18, -12,  19,  13,  19,  -6,

  175.    22,   6,  22,   0,  23, -17,  25,  18,  25,  -8,  29,   8,  29,   0,  31,

  176.     0,   0,  -6, -22,   6, -22, -13, -19,  12, -19,   0, -18,  -5, -17,   5,

  177.   -17, -10, -15,  10, -15,   0, -14,  -4, -13,   4, -13,  19, -13, -19, -12,

  178.    -8, -11,  -2, -11,   0, -11,   2, -11,   8, -11, -15, -10,  -4, -10,   4,

  179.   -10,  15, -10,  -6,  -9,  -1,  -9,   1,  -9,   6,  -9, -11,  -8,  -8,  -8,

  180.    -3,  -8,   0,  -8,   3,  -8,   8,  -8,  11,  -8,  -5,  -7,  -2,  -7,   0,

  181.    -7,   2,  -7,   5,  -7, -22,  -6,  -9,  -6,  -6,  -6,  -3,  -6,  -1,  -6,

  182.     1,  -6,   3,  -6,   6,  -6,   9,  -6,  22,  -6, -17,  -5,  -7,  -5,  -4,

  183.    -5,  -2,  -5,  -1,  -5,   0,  -5,   1,  -5,   2,  -5,   4,  -5,   7,  -5,

  184.    17,  -5, -13,  -4, -10,  -4,  -5,  -4,  -3,  -4,  -2,  -4,  -1,  -4,   0,

  185.    -4,   1,  -4,   2,  -4,   3,  -4,   5,  -4,  10,  -4,  13,  -4,  -8,  -3,

  186.    -6,  -3,  -4,  -3,  -3,  -3,  -2,  -3,  -1,  -3,   0,  -3,   1,  -3,   2,

  187.    -3,   3,  -3,   4,  -3,   6,  -3,   8,  -3, -11,  -2,  -7,  -2,  -5,  -2,

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

  189.    -2,   4,  -2,   5,  -2,   7,  -2,  11,  -2,  -9,  -1,  -6,  -1,  -5,  -1,

  190.    -4,  -1,  -3,  -1,  -2,  -1,  -1,  -1,   0,  -1,   1,  -1,   2,  -1,   3,

  191.    -1,   4,  -1,   5,  -1,   6,  -1,   9,  -1, -23,   0, -18,   0, -14,   0,

  192.   -11,   0,  -7,   0,  -5,   0,  -4,   0,  -3,   0,  -2,   0,  -1,   0,   0,

  193.   -23,   1,   0,   2,   0,   3,   0,   4,   0,   5,   0,   7,   0,  11,   0,

  194.    14,   0,  18,   0,  23,   0,  -9,   1,  -6,   1,  -5,   1,  -4,   1,  -3,

  195.     1,  -2,   1,  -1,   1,   0,   1,   1,   1,   2,   1,   3,   1,   4,   1,

  196.     5,   1,   6,   1,   9,   1, -11,   2,  -7,   2,  -5,   2,  -4,   2,  -3,

  197.     2,  -2,   2,  -1,   2,   0,   2,   1,   2,   2,   2,   3,   2,   4,   2,

  198.     5,   2,   7,   2,  11,   2,  -8,   3,  -6,   3,  -4,   3,  -3,   3,  -2,

  199.     3,  -1,   3,   0,   3,   1,   3,   2,   3,   3,   3,   4,   3,   6,   3,

  200.     8,   3, -13,   4, -10,   4,  -5,   4,  -3,   4,  -2,   4,  -1,   4,   0,

  201.     4,   1,   4,   2,   4,   3,   4,   5,   4,  10,   4,  13,   4, -17,   5,

  202.    -7,   5,  -4,   5,  -2,   5,  -1,   5,   0,   5,   1,   5,   2,   5,   4,

  203.     5,   7,   5,  17,   5, -22,   6,  -9,   6,  -6,   6,  -3,   6,  -1,   6,

  204.     1,   6,   3,   6,   6,   6,   9,   6,  22,   6,  -5,   7,  -2,   7,   0,

  205.     7,   2,   7,   5,   7, -11,   8,  -8,   8,  -3,   8,   0,   8,   3,   8,

  206.     8,   8,  11,   8,  -6,   9,  -1,   9,   1,   9,   6,   9, -15,  10,  -4,

  207.    10,   4,  10,  15,  10,  -8,  11,  -2,  11,   0,  11,   2,  11,   8,  11,

  208.    19,  12, -19,  13,  -4,  13,   4,  13,   0,  14, -10,  15,  10,  15,  -5,

  209.    17,   5,  17,   0,  18, -12,  19,  13,  19,  -6,  22,   6,  22,   0,  23,

  210. };

  211. 

  212. typedef struct SANMVideoContext {

  213.     AVCodecContext *avctx;

  214.     GetByteContext gb;

  215. 

  216.     int version, subversion;

  217.     uint32_t pal[PALETTE_SIZE];

  218.     int16_t delta_pal[PALETTE_DELTA];

  219. 

  220.     ptrdiff_t pitch;

  221.     int width, height;

  222.     int aligned_width, aligned_height;

  223.     int prev_seq;

  224. 

  225.     AVFrame *frame;

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

  227.     uint8_t *stored_frame;

  228.     uint32_t frm0_size, frm1_size, frm2_size;

  229.     uint32_t stored_frame_size;

  230. 

  231.     uint8_t *rle_buf;

  232.     unsigned int rle_buf_size;

  233. 

  234.     int rotate_code;

  235. 

  236.     long npixels, buf_size;

  237. 

  238.     uint16_t codebook[256];

  239.     uint16_t small_codebook[4];

  240. 

  241.     int8_t p4x4glyphs[NGLYPHS][16];

  242.     int8_t p8x8glyphs[NGLYPHS][64];

  243. } SANMVideoContext;

  244. 

  245. typedef struct SANMFrameHeader {

  246.     int seq_num, codec, rotate_code, rle_output_size;

  247. 

  248.     uint16_t bg_color;

  249.     uint32_t width, height;

  250. } SANMFrameHeader;

  251. 

  252. enum GlyphEdge {

  253.     LEFT_EDGE,

  254.     TOP_EDGE,

  255.     RIGHT_EDGE,

  256.     BOTTOM_EDGE,

  257.     NO_EDGE

  258. };

  259. 

  260. enum GlyphDir {

  261.     DIR_LEFT,

  262.     DIR_UP,

  263.     DIR_RIGHT,

  264.     DIR_DOWN,

  265.     NO_DIR

  266. };

  267. 

  268. /**

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

  270.  *

  271.  * @param x x point coordinate

  272.  * @param y y point coordinate

  273.  * @param edge_size box width/height.

  274.  */

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

  276. {

  277.     const int edge_max = edge_size - 1;

  278. 

  279.     if (!y)

  280.         return BOTTOM_EDGE;

  281.     else if (y == edge_max)

  282.         return TOP_EDGE;

  283.     else if (!x)

  284.         return LEFT_EDGE;

  285.     else if (x == edge_max)

  286.         return RIGHT_EDGE;

  287.     else

  288.         return NO_EDGE;

  289. }

  290. 

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

  292. {

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

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

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

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

  297.         return DIR_UP;

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

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

  300.         return DIR_DOWN;

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

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

  303.         return DIR_LEFT;

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

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

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

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

  308.         return DIR_RIGHT;

  309. 

  310.     return NO_DIR;

  311. }

  312. 

  313. /* Interpolate two points. */

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

  315.                          int pos, int npoints)

  316. {

  317.     if (npoints) {

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

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

  320.     } else {

  321.         points[0] = x0;

  322.         points[1] = y0;

  323.     }

  324. }

  325. 

  326. /**

  327.  * Construct glyphs by iterating through vector coordinates.

  328.  *

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

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

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

  332.  * @param side_length glyph width/height.

  333.  */

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

  335.                         const int side_length)

  336. {

  337.     const int glyph_size = side_length * side_length;

  338.     int8_t *pglyph = pglyphs;

  339. 

  340.     int i, j;

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

  342.         int x0 = xvec[i];

  343.         int y0 = yvec[i];

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

  345. 

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

  347.             int x1 = xvec[j];

  348.             int y1 = yvec[j];

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

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

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

  352.             int ipoint;

  353. 

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

  355.                 int8_t point[2];

  356.                 int irow, icol;

  357. 

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

  359. 

  360.                 switch (dir) {

  361.                 case DIR_UP:

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

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

  364.                     break;

  365. 

  366.                 case DIR_DOWN:

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

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

  369.                     break;

  370. 

  371.                 case DIR_LEFT:

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

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

  374.                     break;

  375. 

  376.                 case DIR_RIGHT:

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

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

  379.                     break;

  380.                 }

  381.             }

  382.         }

  383.     }

  384. }

  385. 

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

  387. {

  388.     ctx->width   = width;

  389.     ctx->height  = height;

  390.     ctx->npixels = width * height;

  391. 

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

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

  394. 

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

  396.     ctx->pitch    = width;

  397. }

  398. 

  399. static void destroy_buffers(SANMVideoContext *ctx)

  400. {

  401.     av_freep(&ctx->frm0);

  402.     av_freep(&ctx->frm1);

  403.     av_freep(&ctx->frm2);

  404.     av_freep(&ctx->stored_frame);

  405.     av_freep(&ctx->rle_buf);

  406.     ctx->frm0_size =

  407.     ctx->frm1_size =

  408.     ctx->frm2_size = 0;

  409. }

  410. 

  411. static av_cold int init_buffers(SANMVideoContext *ctx)

  412. {

  413.     av_fast_padded_malloc(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);

  414.     av_fast_padded_malloc(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);

  415.     av_fast_padded_malloc(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);

  416.     if (!ctx->version)

  417.         av_fast_padded_malloc(&ctx->stored_frame,

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

  419. 

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

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

  422.         destroy_buffers(ctx);

  423.         return AVERROR(ENOMEM);

  424.     }

  425. 

  426.     return 0;

  427. }

  428. 

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

  430. {

  431.     if (rotate_code == 2)

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

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

  434. }

  435. 

  436. static av_cold int decode_init(AVCodecContext *avctx)

  437. {

  438.     SANMVideoContext *ctx = avctx->priv_data;

  439. 

  440.     ctx->avctx   = avctx;

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

  442. 

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

  444. 

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

  446.     if (init_buffers(ctx)) {

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

  448.         return AVERROR(ENOMEM);

  449.     }

  450. 

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

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

  453. 

  454.     if (!ctx->version) {

  455.         int i;

  456. 

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

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

  459.             return AVERROR_INVALIDDATA;

  460.         }

  461. 

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

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

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

  465.     }

  466. 

  467.     return 0;

  468. }

  469. 

  470. static av_cold int decode_end(AVCodecContext *avctx)

  471. {

  472.     SANMVideoContext *ctx = avctx->priv_data;

  473. 

  474.     destroy_buffers(ctx);

  475. 

  476.     return 0;

  477. }

  478. 

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

  480. {

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

  482. 

  483.     while (left > 0) {

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

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

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

  487.             return AVERROR_INVALIDDATA;

  488. 

  489.         if (opcode & 1) {

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

  491.             memset(dst, color, run_len);

  492.         } else {

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

  494.                 return AVERROR_INVALIDDATA;

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

  496.         }

  497. 

  498.         dst  += run_len;

  499.         left -= run_len;

  500.     }

  501. 

  502.     return 0;

  503. }

  504. 

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

  506.                       int left, int width, int height)

  507. {

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

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

  510. 

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

  512.         pos = 0;

  513. 

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

  515.             return AVERROR_INVALIDDATA;

  516. 

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

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

  519. 

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

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

  522.                 return AVERROR_INVALIDDATA;

  523. 

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

  525.             flag = code & 1;

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

  527.             if (pos + code > width)

  528.                 return AVERROR_INVALIDDATA;

  529.             if (flag) {

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

  531.                 if (val)

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

  533.                 pos += code;

  534.             } else {

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

  536.                     return AVERROR_INVALIDDATA;

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

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

  539.                     if (val)

  540.                         dst[pos] = val;

  541.                     pos++;

  542.                 }

  543.             }

  544.         }

  545.         dst += ctx->pitch;

  546.     }

  547.     ctx->rotate_code = 0;

  548. 

  549.     return 0;

  550. }

  551. 

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

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

  554. {

  555.     int pos, i, j;

  556. 

  557.     pos = x + y * stride;

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

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

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

  561.                 dst[i] = 0;

  562.             else

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

  564.         }

  565.         dst += stride;

  566.         src += stride;

  567.         pos += stride;

  568.     }

  569. }

  570. 

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

  572.                        int left, int width, int height)

  573. {

  574.     ptrdiff_t stride = ctx->pitch;

  575.     int i, j, k, t;

  576.     uint8_t *dst, *prev;

  577.     int skip_run = 0;

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

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

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

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

  582.     int flags;

  583. 

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

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

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

  587. 

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

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

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

  591.     }

  592. 

  593.     ctx->rotate_code = 0;

  594. 

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

  596.         rotate_bufs(ctx, 1);

  597. 

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

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

  600. 

  601.     if (mvoff > 2) {

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

  603.         return AVERROR_INVALIDDATA;

  604.     }

  605. 

  606.     switch (compr) {

  607.     case 0:

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

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

  610.             dst += stride;

  611.         }

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

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

  614.         break;

  615.     case 2:

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

  617.             return AVERROR_INVALIDDATA;

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

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

  620.         break;

  621.     case 3:

  622.     case 4:

  623.         if (flags & 4) {

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

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

  626.                     int code;

  627.                     if (skip_run) {

  628.                         skip_run--;

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

  630.                         continue;

  631.                     }

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

  633.                         return AVERROR_INVALIDDATA;

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

  635.                     switch (code) {

  636.                     case 0xFF:

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

  638.                             return AVERROR_INVALIDDATA;

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

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

  641.                         break;

  642.                     case 0xFE:

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

  644.                             return AVERROR_INVALIDDATA;

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

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

  647.                         break;

  648.                     case 0xFD:

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

  650.                             return AVERROR_INVALIDDATA;

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

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

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

  654.                         break;

  655.                     default:

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

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

  658.                                 return AVERROR_INVALIDDATA;

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

  660.                             i -= 4;

  661.                         } else {

  662.                             int mx, my;

  663. 

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

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

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

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

  668.                         }

  669.                     }

  670.                 }

  671.                 dst  += stride * 4;

  672.                 prev += stride * 4;

  673.             }

  674.         } else {

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

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

  677.                     int code;

  678.                     if (skip_run) {

  679.                         skip_run--;

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

  681.                         continue;

  682.                     }

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

  684.                     if (code == 0xFF) {

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

  686.                             return AVERROR_INVALIDDATA;

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

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

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

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

  691.                             return AVERROR_INVALIDDATA;

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

  693.                         i -= 4;

  694.                     } else {

  695.                         int mx, my;

  696. 

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

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

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

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

  701.                     }

  702.                 }

  703.                 dst  += stride * 4;

  704.                 prev += stride * 4;

  705.             }

  706.         }

  707.         break;

  708.     default:

  709.         avpriv_report_missing_feature(ctx->avctx,

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

  711.         return AVERROR_PATCHWELCOME;

  712.     }

  713. 

  714.     return 0;

  715. }

  716. 

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

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

  719. {

  720.     int code, k, t;

  721.     uint8_t colors[2];

  722.     int8_t *pglyph;

  723. 

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

  725.         return AVERROR_INVALIDDATA;

  726. 

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

  728.     if (code >= 0xF8) {

  729.         switch (code) {

  730.         case 0xFF:

  731.             if (size == 2) {

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

  733.                     return AVERROR_INVALIDDATA;

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

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

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

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

  738.             } else {

  739.                 size >>= 1;

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

  741.                     return AVERROR_INVALIDDATA;

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

  743.                                   stride, tbl, size))

  744.                     return AVERROR_INVALIDDATA;

  745.                 dst   += size * stride;

  746.                 prev1 += size * stride;

  747.                 prev2 += size * stride;

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

  749.                     return AVERROR_INVALIDDATA;

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

  751.                                   stride, tbl, size))

  752.                     return AVERROR_INVALIDDATA;

  753.             }

  754.             break;

  755.         case 0xFE:

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

  757.                 return AVERROR_INVALIDDATA;

  758. 

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

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

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

  762.             break;

  763.         case 0xFD:

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

  765.                 return AVERROR_INVALIDDATA;

  766. 

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

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

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

  770. 

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

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

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

  774.             break;

  775.         case 0xFC:

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

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

  778.             break;

  779.         default:

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

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

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

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

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

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

  786.         }

  787.     } else {

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

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

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

  791. 

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

  793. 

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

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

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

  797.             return AVERROR_INVALIDDATA;

  798.         }

  799. 

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

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

  802.     }

  803. 

  804.     return 0;

  805. }

  806. 

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

  808.                        int left, int width, int height)

  809. {

  810.     uint32_t decoded_size;

  811.     int i, j;

  812.     ptrdiff_t stride = ctx->pitch;

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

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

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

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

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

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

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

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

  821. 

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

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

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

  825. 

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

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

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

  829.     }

  830. 

  831.     if (skip & 1)

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

  833.     if (!seq) {

  834.         ctx->prev_seq = -1;

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

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

  837.     }

  838. 

  839.     switch (compr) {

  840.     case 0:

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

  842.             return AVERROR_INVALIDDATA;

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

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

  845.             dst += stride;

  846.         }

  847.         break;

  848.     case 1:

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

  850.             return AVERROR_INVALIDDATA;

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

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

  853.                 dst[i] =

  854.                 dst[i + 1] =

  855.                 dst[stride + i] =

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

  857.             }

  858.             dst += stride * 2;

  859.         }

  860.         break;

  861.     case 2:

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

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

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

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

  866.                                       tbl_pos + 8, 8))

  867.                         return AVERROR_INVALIDDATA;

  868.                 dst   += stride * 8;

  869.                 prev1 += stride * 8;

  870.                 prev2 += stride * 8;

  871.             }

  872.         }

  873.         break;

  874.     case 3:

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

  876.         break;

  877.     case 4:

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

  879.         break;

  880.     case 5:

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

  882.             return AVERROR_INVALIDDATA;

  883.         break;

  884.     default:

  885.         avpriv_report_missing_feature(ctx->avctx,

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

  887.         return AVERROR_PATCHWELCOME;

  888.     }

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

  890.         ctx->rotate_code = new_rot;

  891.     else

  892.         ctx->rotate_code = 0;

  893.     ctx->prev_seq = seq;

  894. 

  895.     return 0;

  896. }

  897. 

  898. static int process_frame_obj(SANMVideoContext *ctx)

  899. {

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

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

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

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

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

  905. 

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

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

  908.         return AVERROR_INVALIDDATA;

  909.     }

  910. 

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

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

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

  914.         if (ret < 0)

  915.             return ret;

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

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

  918.         if (init_buffers(ctx)) {

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

  920.             return AVERROR(ENOMEM);

  921.         }

  922.     }

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

  924. 

  925.     switch (codec) {

  926.     case 1:

  927.     case 3:

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

  929.     case 37:

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

  931.     case 47:

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

  933.     default:

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

  935.         return AVERROR_PATCHWELCOME;

  936.     }

  937. }

  938. 

  939. static int decode_0(SANMVideoContext *ctx)

  940. {

  941.     uint16_t *frm = ctx->frm0;

  942.     int x, y;

  943. 

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

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

  946.         return AVERROR_INVALIDDATA;

  947.     }

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

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

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

  951.         frm += ctx->pitch;

  952.     }

  953.     return 0;

  954. }

  955. 

  956. static int decode_nop(SANMVideoContext *ctx)

  957. {

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

  959.     return AVERROR_PATCHWELCOME;

  960. }

  961. 

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

  963. {

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

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

  966.     ptrdiff_t stride = pitch * 2;

  967. 

  968.     switch (block_size) {

  969.     case 2:

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

  971.         break;

  972.     case 4:

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

  974.         break;

  975.     case 8:

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

  977.         break;

  978.     }

  979. }

  980. 

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

  982. {

  983.     int x, y;

  984. 

  985.     pitch -= block_size;

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

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

  988.             *pdest++ = color;

  989. }

  990. 

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

  992.                       uint16_t fg_color, uint16_t bg_color, int block_size,

  993.                       ptrdiff_t pitch)

  994. {

  995.     int8_t *pglyph;

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

  997.     int x, y;

  998. 

  999.     if (index >= NGLYPHS) {

  1000.         av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);

  1001.         return AVERROR_INVALIDDATA;

  1002.     }

  1003. 

  1004.     pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];

  1005.     pitch -= block_size;

  1006. 

  1007.     for (y = 0; y < block_size; y++, dst += pitch)

  1008.         for (x = 0; x < block_size; x++)

  1009.             *dst++ = colors[*pglyph++];

  1010.     return 0;

  1011. }

  1012. 

  1013. static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)

  1014. {

  1015.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  1016. 

  1017.     if (block_size == 2) {

  1018.         uint32_t indices;

  1019. 

  1020.         if (bytestream2_get_bytes_left(&ctx->gb) < 4)

  1021.             return AVERROR_INVALIDDATA;

  1022. 

  1023.         indices        = bytestream2_get_le32u(&ctx->gb);

  1024.         dst[0]         = ctx->codebook[indices & 0xFF];

  1025.         indices      >>= 8;

  1026.         dst[1]         = ctx->codebook[indices & 0xFF];

  1027.         indices      >>= 8;

  1028.         dst[pitch]     = ctx->codebook[indices & 0xFF];

  1029.         indices      >>= 8;

  1030.         dst[pitch + 1] = ctx->codebook[indices & 0xFF];

  1031.     } else {

  1032.         uint16_t fgcolor, bgcolor;

  1033.         int glyph;

  1034. 

  1035.         if (bytestream2_get_bytes_left(&ctx->gb) < 3)

  1036.             return AVERROR_INVALIDDATA;

  1037. 

  1038.         glyph   = bytestream2_get_byteu(&ctx->gb);

  1039.         bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1040.         fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1041. 

  1042.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  1043.     }

  1044.     return 0;

  1045. }

  1046. 

  1047. static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)

  1048. {

  1049.     uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;

  1050. 

  1051.     if (block_size == 2) {

  1052.         if (bytestream2_get_bytes_left(&ctx->gb) < 8)

  1053.             return AVERROR_INVALIDDATA;

  1054. 

  1055.         dst[0]         = bytestream2_get_le16u(&ctx->gb);

  1056.         dst[1]         = bytestream2_get_le16u(&ctx->gb);

  1057.         dst[pitch]     = bytestream2_get_le16u(&ctx->gb);

  1058.         dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);

  1059.     } else {

  1060.         uint16_t fgcolor, bgcolor;

  1061.         int glyph;

  1062. 

  1063.         if (bytestream2_get_bytes_left(&ctx->gb) < 5)

  1064.             return AVERROR_INVALIDDATA;

  1065. 

  1066.         glyph   = bytestream2_get_byteu(&ctx->gb);

  1067.         bgcolor = bytestream2_get_le16u(&ctx->gb);

  1068.         fgcolor = bytestream2_get_le16u(&ctx->gb);

  1069. 

  1070.         draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);

  1071.     }

  1072.     return 0;

  1073. }

  1074. 

  1075. static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,

  1076.                      int block_size)

  1077. {

  1078.     int start_pos = cx + mx + (cy + my) * ctx->pitch;

  1079.     int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);

  1080. 

  1081.     int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);

  1082. 

  1083.     if (!good)

  1084.         av_log(ctx->avctx, AV_LOG_ERROR,

  1085.                "Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",

  1086.                cx + mx, cy + my, cx, cy, block_size);

  1087. 

  1088.     return good;

  1089. }

  1090. 

  1091. static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)

  1092. {

  1093.     int16_t mx, my, index;

  1094.     int opcode;

  1095. 

  1096.     if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  1097.         return AVERROR_INVALIDDATA;

  1098. 

  1099.     opcode = bytestream2_get_byteu(&ctx->gb);

  1100. 

  1101.     switch (opcode) {

  1102.     default:

  1103.         mx = motion_vectors[opcode][0];

  1104.         my = motion_vectors[opcode][1];

  1105. 

  1106.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  1107.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  1108.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  1109.                        blk_size, ctx->pitch);

  1110.         }

  1111.         break;

  1112.     case 0xF5:

  1113.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  1114.             return AVERROR_INVALIDDATA;

  1115.         index = bytestream2_get_le16u(&ctx->gb);

  1116. 

  1117.         mx = index % ctx->width;

  1118.         my = index / ctx->width;

  1119. 

  1120.         if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {

  1121.             copy_block(ctx->frm0 + cx      + ctx->pitch *  cy,

  1122.                        ctx->frm2 + cx + mx + ctx->pitch * (cy + my),

  1123.                        blk_size, ctx->pitch);

  1124.         }

  1125.         break;

  1126.     case 0xF6:

  1127.         copy_block(ctx->frm0 + cx + ctx->pitch * cy,

  1128.                    ctx->frm1 + cx + ctx->pitch * cy,

  1129.                    blk_size, ctx->pitch);

  1130.         break;

  1131.     case 0xF7:

  1132.         opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);

  1133.         break;

  1134. 

  1135.     case 0xF8:

  1136.         opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  1137.         break;

  1138.     case 0xF9:

  1139.     case 0xFA:

  1140.     case 0xFB:

  1141.     case 0xFC:

  1142.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1143.                    ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);

  1144.         break;

  1145.     case 0xFD:

  1146.         if (bytestream2_get_bytes_left(&ctx->gb) < 1)

  1147.             return AVERROR_INVALIDDATA;

  1148.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1149.                    ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);

  1150.         break;

  1151.     case 0xFE:

  1152.         if (bytestream2_get_bytes_left(&ctx->gb) < 2)

  1153.             return AVERROR_INVALIDDATA;

  1154.         fill_block(ctx->frm0 + cx + cy * ctx->pitch,

  1155.                    bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);

  1156.         break;

  1157.     case 0xFF:

  1158.         if (blk_size == 2) {

  1159.             opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);

  1160.         } else {

  1161.             blk_size >>= 1;

  1162.             if (codec2subblock(ctx, cx, cy, blk_size))

  1163.                 return AVERROR_INVALIDDATA;

  1164.             if (codec2subblock(ctx, cx + blk_size, cy, blk_size))

  1165.                 return AVERROR_INVALIDDATA;

  1166.             if (codec2subblock(ctx, cx, cy + blk_size, blk_size))

  1167.                 return AVERROR_INVALIDDATA;

  1168.             if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))

  1169.                 return AVERROR_INVALIDDATA;

  1170.         }

  1171.         break;

  1172.     }

  1173.     return 0;

  1174. }

  1175. 

  1176. static int decode_2(SANMVideoContext *ctx)

  1177. {

  1178.     int cx, cy, ret;

  1179. 

  1180.     for (cy = 0; cy < ctx->aligned_height; cy += 8)

  1181.         for (cx = 0; cx < ctx->aligned_width; cx += 8)

  1182.             if (ret = codec2subblock(ctx, cx, cy, 8))

  1183.                 return ret;

  1184. 

  1185.     return 0;

  1186. }

  1187. 

  1188. static int decode_3(SANMVideoContext *ctx)

  1189. {

  1190.     memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);

  1191.     return 0;

  1192. }

  1193. 

  1194. static int decode_4(SANMVideoContext *ctx)

  1195. {

  1196.     memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);

  1197.     return 0;

  1198. }

  1199. 

  1200. static int decode_5(SANMVideoContext *ctx)

  1201. {

  1202. #if HAVE_BIGENDIAN

  1203.     uint16_t *frm;

  1204.     int npixels;

  1205. #endif

  1206.     uint8_t *dst = (uint8_t*)ctx->frm0;

  1207. 

  1208.     if (rle_decode(ctx, dst, ctx->buf_size))

  1209.         return AVERROR_INVALIDDATA;

  1210. 

  1211. #if HAVE_BIGENDIAN

  1212.     npixels = ctx->npixels;

  1213.     frm = ctx->frm0;

  1214.     while (npixels--) {

  1215.         *frm = av_bswap16(*frm);

  1216.         frm++;

  1217.     }

  1218. #endif

  1219. 

  1220.     return 0;

  1221. }

  1222. 

  1223. static int decode_6(SANMVideoContext *ctx)

  1224. {

  1225.     int npixels = ctx->npixels;

  1226.     uint16_t *frm = ctx->frm0;

  1227. 

  1228.     if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {

  1229.         av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");

  1230.         return AVERROR_INVALIDDATA;

  1231.     }

  1232.     while (npixels--)

  1233.         *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];

  1234. 

  1235.     return 0;

  1236. }

  1237. 

  1238. static int decode_8(SANMVideoContext *ctx)

  1239. {

  1240.     uint16_t *pdest = ctx->frm0;

  1241.     uint8_t *rsrc;

  1242.     long npixels = ctx->npixels;

  1243. 

  1244.     av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);

  1245.     if (!ctx->rle_buf) {

  1246.         av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");

  1247.         return AVERROR(ENOMEM);

  1248.     }

  1249.     rsrc = ctx->rle_buf;

  1250. 

  1251.     if (rle_decode(ctx, rsrc, npixels))

  1252.         return AVERROR_INVALIDDATA;

  1253. 

  1254.     while (npixels--)

  1255.         *pdest++ = ctx->codebook[*rsrc++];

  1256. 

  1257.     return 0;

  1258. }

  1259. 

  1260. typedef int (*frm_decoder)(SANMVideoContext *ctx);

  1261. 

  1262. static const frm_decoder v1_decoders[] = {

  1263.     decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,

  1264.     decode_6, decode_nop, decode_8

  1265. };

  1266. 

  1267. static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1268. {

  1269.     int i, ret;

  1270. 

  1271.     if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {

  1272.         av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",

  1273.                ret);

  1274.         return AVERROR_INVALIDDATA;

  1275.     }

  1276.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1277. 

  1278.     hdr->width  = bytestream2_get_le32u(&ctx->gb);

  1279.     hdr->height = bytestream2_get_le32u(&ctx->gb);

  1280. 

  1281.     if (hdr->width != ctx->width || hdr->height != ctx->height) {

  1282.         avpriv_report_missing_feature(ctx->avctx, "Variable size frames");

  1283.         return AVERROR_PATCHWELCOME;

  1284.     }

  1285. 

  1286.     hdr->seq_num     = bytestream2_get_le16u(&ctx->gb);

  1287.     hdr->codec       = bytestream2_get_byteu(&ctx->gb);

  1288.     hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);

  1289. 

  1290.     bytestream2_skip(&ctx->gb, 4); // skip pad

  1291. 

  1292.     for (i = 0; i < 4; i++)

  1293.         ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1294.     hdr->bg_color = bytestream2_get_le16u(&ctx->gb);

  1295. 

  1296.     bytestream2_skip(&ctx->gb, 2); // skip pad

  1297. 

  1298.     hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);

  1299.     for (i = 0; i < 256; i++)

  1300.         ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);

  1301. 

  1302.     bytestream2_skip(&ctx->gb, 8); // skip pad

  1303. 

  1304.     return 0;

  1305. }

  1306. 

  1307. static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)

  1308. {

  1309.     while (buf_size--)

  1310.         *pbuf++ = color;

  1311. }

  1312. 

  1313. static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)

  1314. {

  1315.     uint8_t *dst;

  1316.     const uint8_t *src = (uint8_t*) ctx->frm0;

  1317.     int ret, height = ctx->height;

  1318.     ptrdiff_t dstpitch, srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);

  1319. 

  1320.     if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)

  1321.         return ret;

  1322. 

  1323.     dst      = ctx->frame->data[0];

  1324.     dstpitch = ctx->frame->linesize[0];

  1325. 

  1326.     while (height--) {

  1327.         memcpy(dst, src, srcpitch);

  1328.         src += srcpitch;

  1329.         dst += dstpitch;

  1330.     }

  1331. 

  1332.     return 0;

  1333. }

  1334. 

  1335. static int decode_frame(AVCodecContext *avctx, void *data,

  1336.                         int *got_frame_ptr, AVPacket *pkt)

  1337. {

  1338.     SANMVideoContext *ctx = avctx->priv_data;

  1339.     int i, ret;

  1340. 

  1341.     ctx->frame = data;

  1342.     bytestream2_init(&ctx->gb, pkt->data, pkt->size);

  1343. 

  1344.     if (!ctx->version) {

  1345.         int to_store = 0;

  1346. 

  1347.         while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {

  1348.             uint32_t sig, size;

  1349.             int pos;

  1350. 

  1351.             sig  = bytestream2_get_be32u(&ctx->gb);

  1352.             size = bytestream2_get_be32u(&ctx->gb);

  1353.             pos  = bytestream2_tell(&ctx->gb);

  1354. 

  1355.             if (bytestream2_get_bytes_left(&ctx->gb) < size) {

  1356.                 av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %"PRIu32".\n", size);

  1357.                 break;

  1358.             }

  1359.             switch (sig) {

  1360.             case MKBETAG('N', 'P', 'A', 'L'):

  1361.                 if (size != PALETTE_SIZE * 3) {

  1362.                     av_log(avctx, AV_LOG_ERROR,

  1363.                            "Incorrect palette block size %"PRIu32".\n", size);

  1364.                     return AVERROR_INVALIDDATA;

  1365.                 }

  1366.                 for (i = 0; i < PALETTE_SIZE; i++)

  1367.                     ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1368.                 break;

  1369.             case MKBETAG('F', 'O', 'B', 'J'):

  1370.                 if (size < 16)

  1371.                     return AVERROR_INVALIDDATA;

  1372.                 if (ret = process_frame_obj(ctx))

  1373.                     return ret;

  1374.                 break;

  1375.             case MKBETAG('X', 'P', 'A', 'L'):

  1376.                 if (size == 6 || size == 4) {

  1377.                     uint8_t tmp[3];

  1378.                     int j;

  1379. 

  1380.                     for (i = 0; i < PALETTE_SIZE; i++) {

  1381.                         for (j = 0; j < 3; j++) {

  1382.                             int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;

  1383.                             tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);

  1384.                         }

  1385.                         ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);

  1386.                     }

  1387.                 } else {

  1388.                     if (size < PALETTE_DELTA * 2 + 4) {

  1389.                         av_log(avctx, AV_LOG_ERROR,

  1390.                                "Incorrect palette change block size %"PRIu32".\n",

  1391.                                size);

  1392.                         return AVERROR_INVALIDDATA;

  1393.                     }

  1394.                     bytestream2_skipu(&ctx->gb, 4);

  1395.                     for (i = 0; i < PALETTE_DELTA; i++)

  1396.                         ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);

  1397.                     if (size >= PALETTE_DELTA * 5 + 4) {

  1398.                         for (i = 0; i < PALETTE_SIZE; i++)

  1399.                             ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);

  1400.                     } else {

  1401.                         memset(ctx->pal, 0, sizeof(ctx->pal));

  1402.                     }

  1403.                 }

  1404.                 break;

  1405.             case MKBETAG('S', 'T', 'O', 'R'):

  1406.                 to_store = 1;

  1407.                 break;

  1408.             case MKBETAG('F', 'T', 'C', 'H'):

  1409.                 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);

  1410.                 break;

  1411.             default:

  1412.                 bytestream2_skip(&ctx->gb, size);

  1413.                 av_log(avctx, AV_LOG_DEBUG,

  1414.                        "Unknown/unsupported chunk %"PRIx32".\n", sig);

  1415.                 break;

  1416.             }

  1417. 

  1418.             bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);

  1419.             if (size & 1)

  1420.                 bytestream2_skip(&ctx->gb, 1);

  1421.         }

  1422.         if (to_store)

  1423.             memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);

  1424.         if ((ret = copy_output(ctx, NULL)))

  1425.             return ret;

  1426.         memcpy(ctx->frame->data[1], ctx->pal, 1024);

  1427.     } else {

  1428.         SANMFrameHeader header;

  1429. 

  1430.         if ((ret = read_frame_header(ctx, &header)))

  1431.             return ret;

  1432. 

  1433.         ctx->rotate_code = header.rotate_code;

  1434.         if ((ctx->frame->key_frame = !header.seq_num)) {

  1435.             ctx->frame->pict_type = AV_PICTURE_TYPE_I;

  1436.             fill_frame(ctx->frm1, ctx->npixels, header.bg_color);

  1437.             fill_frame(ctx->frm2, ctx->npixels, header.bg_color);

  1438.         } else {

  1439.             ctx->frame->pict_type = AV_PICTURE_TYPE_P;

  1440.         }

  1441. 

  1442.         if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {

  1443.             if ((ret = v1_decoders[header.codec](ctx))) {

  1444.                 av_log(avctx, AV_LOG_ERROR,

  1445.                        "Subcodec %d: error decoding frame.\n", header.codec);

  1446.                 return ret;

  1447.             }

  1448.         } else {

  1449.             avpriv_request_sample(avctx, "Subcodec %d", header.codec);

  1450.             return AVERROR_PATCHWELCOME;

  1451.         }

  1452. 

  1453.         if ((ret = copy_output(ctx, &header)))

  1454.             return ret;

  1455.     }

  1456.     if (ctx->rotate_code)

  1457.         rotate_bufs(ctx, ctx->rotate_code);

  1458. 

  1459.     *got_frame_ptr = 1;

  1460. 

  1461.     return pkt->size;

  1462. }

  1463. 

  1464. AVCodec ff_sanm_decoder = {

  1465.     .name           = "sanm",

  1466.     .long_name      = NULL_IF_CONFIG_SMALL("LucasArts SANM video"),

  1467.     .type           = AVMEDIA_TYPE_VIDEO,

  1468.     .id             = AV_CODEC_ID_SANM,

  1469.     .priv_data_size = sizeof(SANMVideoContext),

  1470.     .init           = decode_init,

  1471.     .close          = decode_end,

  1472.     .decode         = decode_frame,

  1473.     .capabilities   = AV_CODEC_CAP_DR1,

  1474. };