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FFmpeg/libavcodec/huffyuvdec.c

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  1. /*

  2.  * huffyuv decoder

  3.  *

  4.  * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of

  7.  * the algorithm used

  8.  *

  9.  * This file is part of Libav.

  10.  *

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

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

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

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

  15.  *

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

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

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

  19.  * Lesser General Public License for more details.

  20.  *

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

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

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

  24.  */

  25. 

  26. /**

  27.  * @file

  28.  * huffyuv decoder

  29.  */

  30. 

  31. #include "avcodec.h"

  32. #include "get_bits.h"

  33. #include "huffyuv.h"

  34. #include "huffyuvdsp.h"

  35. #include "thread.h"

  36. 

  37. #define classic_shift_luma_table_size 42

  38. static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {

  39.     34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,

  40.     14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,

  41.     10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0

  42. };

  43. 

  44. #define classic_shift_chroma_table_size 59

  45. static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {

  46.     66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,

  47.     84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,

  48.     57, 56,  58,  57, 58, 57, 184, 119, 214, 245, 116,  83,  82, 49, 80,  79,

  49.     78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0

  50. };

  51. 

  52. static const unsigned char classic_add_luma[256] = {

  53.      3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  54.     73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  55.     68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  56.     35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  57.     37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  58.     35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  59.     27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  60.     15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  61.     12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  62.     12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  63.     18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  64.     28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  65.     28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  66.     62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  67.     54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  68.     46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  69. };

  70. 

  71. static const unsigned char classic_add_chroma[256] = {

  72.      3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,

  73.      7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,

  74.      11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,

  75.      43,  45,  76,  81,  46,  82,  75,  55,  56, 144,  58,  80,  60,  74, 147,  63,

  76.     143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,

  77.      80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  27,  30,  21,  22,

  78.      17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,

  79.     112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,

  80.       0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,

  81.     135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,

  82.      52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,

  83.      19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,

  84.       7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,

  85.      83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,

  86.      14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,

  87.       6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,

  88. };

  89. 

  90. static int read_len_table(uint8_t *dst, GetBitContext *gb)

  91. {

  92.     int i, val, repeat;

  93. 

  94.     for (i = 0; i < 256;) {

  95.         repeat = get_bits(gb, 3);

  96.         val    = get_bits(gb, 5);

  97.         if (repeat == 0)

  98.             repeat = get_bits(gb, 8);

  99.         if (i + repeat > 256 || get_bits_left(gb) < 0) {

  100.             av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");

  101.             return -1;

  102.         }

  103.         while (repeat--)

  104.             dst[i++] = val;

  105.     }

  106.     return 0;

  107. }

  108. 

  109. static void generate_joint_tables(HYuvContext *s)

  110. {

  111.     uint16_t symbols[1 << VLC_BITS];

  112.     uint16_t bits[1 << VLC_BITS];

  113.     uint8_t len[1 << VLC_BITS];

  114.     if (s->bitstream_bpp < 24) {

  115.         int p, i, y, u;

  116.         for (p = 0; p < 3; p++) {

  117.             for (i = y = 0; y < 256; y++) {

  118.                 int len0  = s->len[0][y];

  119.                 int limit = VLC_BITS - len0;

  120.                 if (limit <= 0)

  121.                     continue;

  122.                 for (u = 0; u < 256; u++) {

  123.                     int len1 = s->len[p][u];

  124.                     if (len1 > limit)

  125.                         continue;

  126.                     len[i]     = len0 + len1;

  127.                     bits[i]    = (s->bits[0][y] << len1) + s->bits[p][u];

  128.                     symbols[i] = (y << 8) + u;

  129.                     if (symbols[i] != 0xffff) // reserved to mean "invalid"

  130.                         i++;

  131.                 }

  132.             }

  133.             ff_free_vlc(&s->vlc[3 + p]);

  134.             ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,

  135.                                bits, 2, 2, symbols, 2, 2, 0);

  136.         }

  137.     } else {

  138.         uint8_t (*map)[4] = (uint8_t(*)[4]) s->pix_bgr_map;

  139.         int i, b, g, r, code;

  140.         int p0 = s->decorrelate;

  141.         int p1 = !s->decorrelate;

  142.         /* Restrict the range to +/-16 because that's pretty much guaranteed

  143.          * to cover all the combinations that fit in 11 bits total, and it

  144.          *  does not matter if we miss a few rare codes. */

  145.         for (i = 0, g = -16; g < 16; g++) {

  146.             int len0   = s->len[p0][g & 255];

  147.             int limit0 = VLC_BITS - len0;

  148.             if (limit0 < 2)

  149.                 continue;

  150.             for (b = -16; b < 16; b++) {

  151.                 int len1   = s->len[p1][b & 255];

  152.                 int limit1 = limit0 - len1;

  153.                 if (limit1 < 1)

  154.                     continue;

  155.                 code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];

  156.                 for (r = -16; r < 16; r++) {

  157.                     int len2 = s->len[2][r & 255];

  158.                     if (len2 > limit1)

  159.                         continue;

  160.                     len[i]  = len0 + len1 + len2;

  161.                     bits[i] = (code << len2) + s->bits[2][r & 255];

  162.                     if (s->decorrelate) {

  163.                         map[i][G] = g;

  164.                         map[i][B] = g + b;

  165.                         map[i][R] = g + r;

  166.                     } else {

  167.                         map[i][B] = g;

  168.                         map[i][G] = b;

  169.                         map[i][R] = r;

  170.                     }

  171.                     i++;

  172.                 }

  173.             }

  174.         }

  175.         ff_free_vlc(&s->vlc[3]);

  176.         init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);

  177.     }

  178. }

  179. 

  180. static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)

  181. {

  182.     GetBitContext gb;

  183.     int i;

  184. 

  185.     init_get_bits(&gb, src, length * 8);

  186. 

  187.     for (i = 0; i < 3; i++) {

  188.         if (read_len_table(s->len[i], &gb) < 0)

  189.             return -1;

  190.         if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0)

  191.             return -1;

  192.         ff_free_vlc(&s->vlc[i]);

  193.         init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,

  194.                  s->bits[i], 4, 4, 0);

  195.     }

  196. 

  197.     generate_joint_tables(s);

  198. 

  199.     return (get_bits_count(&gb) + 7) / 8;

  200. }

  201. 

  202. static int read_old_huffman_tables(HYuvContext *s)

  203. {

  204.     GetBitContext gb;

  205.     int i;

  206. 

  207.     init_get_bits(&gb, classic_shift_luma,

  208.                   classic_shift_luma_table_size * 8);

  209.     if (read_len_table(s->len[0], &gb) < 0)

  210.         return -1;

  211. 

  212.     init_get_bits(&gb, classic_shift_chroma,

  213.                   classic_shift_chroma_table_size * 8);

  214.     if (read_len_table(s->len[1], &gb) < 0)

  215.         return -1;

  216. 

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

  218.         s->bits[0][i] = classic_add_luma[i];

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

  220.         s->bits[1][i] = classic_add_chroma[i];

  221. 

  222.     if (s->bitstream_bpp >= 24) {

  223.         memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));

  224.         memcpy(s->len[1], s->len[0], 256 * sizeof(uint8_t));

  225.     }

  226.     memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));

  227.     memcpy(s->len[2], s->len[1], 256 * sizeof(uint8_t));

  228. 

  229.     for (i = 0; i < 3; i++) {

  230.         ff_free_vlc(&s->vlc[i]);

  231.         init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,

  232.                  s->bits[i], 4, 4, 0);

  233.     }

  234. 

  235.     generate_joint_tables(s);

  236. 

  237.     return 0;

  238. }

  239. 

  240. static av_cold int decode_init(AVCodecContext *avctx)

  241. {

  242.     HYuvContext *s = avctx->priv_data;

  243. 

  244.     ff_huffyuv_common_init(avctx);

  245.     ff_huffyuvdsp_init(&s->hdsp);

  246.     memset(s->vlc, 0, 3 * sizeof(VLC));

  247. 

  248.     s->interlaced = s->height > 288;

  249.     s->bgr32      = 1;

  250. 

  251.     if (avctx->extradata_size) {

  252.         if ((avctx->bits_per_coded_sample & 7) &&

  253.             avctx->bits_per_coded_sample != 12)

  254.             s->version = 1; // do such files exist at all?

  255.         else

  256.             s->version = 2;

  257.     } else

  258.         s->version = 0;

  259. 

  260.     if (s->version == 2) {

  261.         int method, interlace;

  262. 

  263.         if (avctx->extradata_size < 4)

  264.             return -1;

  265. 

  266.         method           = avctx->extradata[0];

  267.         s->decorrelate   = method & 64 ? 1 : 0;

  268.         s->predictor     = method & 63;

  269.         s->bitstream_bpp = avctx->extradata[1];

  270.         if (s->bitstream_bpp == 0)

  271.             s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;

  272.         interlace     = (avctx->extradata[2] & 0x30) >> 4;

  273.         s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;

  274.         s->context    = avctx->extradata[2] & 0x40 ? 1 : 0;

  275. 

  276.         if (read_huffman_tables(s, avctx->extradata + 4,

  277.                                 avctx->extradata_size - 4) < 0)

  278.             return -1;

  279.     } else {

  280.         switch (avctx->bits_per_coded_sample & 7) {

  281.         case 1:

  282.             s->predictor   = LEFT;

  283.             s->decorrelate = 0;

  284.             break;

  285.         case 2:

  286.             s->predictor   = LEFT;

  287.             s->decorrelate = 1;

  288.             break;

  289.         case 3:

  290.             s->predictor   = PLANE;

  291.             s->decorrelate = avctx->bits_per_coded_sample >= 24;

  292.             break;

  293.         case 4:

  294.             s->predictor   = MEDIAN;

  295.             s->decorrelate = 0;

  296.             break;

  297.         default:

  298.             s->predictor   = LEFT; // OLD

  299.             s->decorrelate = 0;

  300.             break;

  301.         }

  302.         s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;

  303.         s->context       = 0;

  304. 

  305.         if (read_old_huffman_tables(s) < 0)

  306.             return -1;

  307.     }

  308. 

  309.     switch (s->bitstream_bpp) {

  310.     case 12:

  311.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  312.         break;

  313.     case 16:

  314.         if (s->yuy2)

  315.             avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  316.         else

  317.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  318.         break;

  319.     case 24:

  320.     case 32:

  321.         if (s->bgr32)

  322.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  323.         else

  324.             avctx->pix_fmt = AV_PIX_FMT_BGR24;

  325.         break;

  326.     default:

  327.         return AVERROR_INVALIDDATA;

  328.     }

  329. 

  330.     ff_huffyuv_alloc_temp(s);

  331. 

  332.     return 0;

  333. }

  334. 

  335. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  336. {

  337.     HYuvContext *s = avctx->priv_data;

  338.     int i;

  339. 

  340.     ff_huffyuv_alloc_temp(s);

  341. 

  342.     for (i = 0; i < 6; i++)

  343.         s->vlc[i].table = NULL;

  344. 

  345.     if (s->version == 2) {

  346.         if (read_huffman_tables(s, avctx->extradata + 4,

  347.                                 avctx->extradata_size) < 0)

  348.             return -1;

  349.     } else {

  350.         if (read_old_huffman_tables(s) < 0)

  351.             return -1;

  352.     }

  353. 

  354.     return 0;

  355. }

  356. 

  357. /* TODO instead of restarting the read when the code isn't in the first level

  358.  * of the joint table, jump into the 2nd level of the individual table. */

  359. #define READ_2PIX(dst0, dst1, plane1)                                   \

  360.     {                                                                   \

  361.         uint16_t code = get_vlc2(&s->gb, s->vlc[3 + plane1].table,      \

  362.                                  VLC_BITS, 1);                          \

  363.         if (code != 0xffff) {                                           \

  364.             dst0 = code >> 8;                                           \

  365.             dst1 = code;                                                \

  366.         } else {                                                        \

  367.             dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);      \

  368.             dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3); \

  369.         }                                                               \

  370.     }

  371. 

  372. static void decode_422_bitstream(HYuvContext *s, int count)

  373. {

  374.     int i;

  375. 

  376.     count /= 2;

  377. 

  378.     if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {

  379.         for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {

  380.             READ_2PIX(s->temp[0][2 * i],     s->temp[1][i], 1);

  381.             READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);

  382.         }

  383.     } else {

  384.         for (i = 0; i < count; i++) {

  385.             READ_2PIX(s->temp[0][2 * i],     s->temp[1][i], 1);

  386.             READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);

  387.         }

  388.     }

  389. }

  390. 

  391. static void decode_gray_bitstream(HYuvContext *s, int count)

  392. {

  393.     int i;

  394. 

  395.     count /= 2;

  396. 

  397.     if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {

  398.         for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {

  399.             READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);

  400.         }

  401.     } else {

  402.         for (i = 0; i < count; i++) {

  403.             READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);

  404.         }

  405.     }

  406. }

  407. 

  408. static av_always_inline void decode_bgr_1(HYuvContext *s, int count,

  409.                                           int decorrelate, int alpha)

  410. {

  411.     int i;

  412.     for (i = 0; i < count; i++) {

  413.         int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);

  414.         if (code != -1) {

  415.             *(uint32_t *) &s->temp[0][4 * i] = s->pix_bgr_map[code];

  416.         } else if (decorrelate) {

  417.             s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);

  418.             s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +

  419.                                     s->temp[0][4 * i + G];

  420.             s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +

  421.                                     s->temp[0][4 * i + G];

  422.         } else {

  423.             s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);

  424.             s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);

  425.             s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);

  426.         }

  427.         if (alpha)

  428.             s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);

  429.     }

  430. }

  431. 

  432. static void decode_bgr_bitstream(HYuvContext *s, int count)

  433. {

  434.     if (s->decorrelate) {

  435.         if (s->bitstream_bpp == 24)

  436.             decode_bgr_1(s, count, 1, 0);

  437.         else

  438.             decode_bgr_1(s, count, 1, 1);

  439.     } else {

  440.         if (s->bitstream_bpp == 24)

  441.             decode_bgr_1(s, count, 0, 0);

  442.         else

  443.             decode_bgr_1(s, count, 0, 1);

  444.     }

  445. }

  446. 

  447. static void draw_slice(HYuvContext *s, AVFrame *frame, int y)

  448. {

  449.     int h, cy, i;

  450.     int offset[AV_NUM_DATA_POINTERS];

  451. 

  452.     if (s->avctx->draw_horiz_band == NULL)

  453.         return;

  454. 

  455.     h  = y - s->last_slice_end;

  456.     y -= h;

  457. 

  458.     if (s->bitstream_bpp == 12)

  459.         cy = y >> 1;

  460.     else

  461.         cy = y;

  462. 

  463.     offset[0] = frame->linesize[0] * y;

  464.     offset[1] = frame->linesize[1] * cy;

  465.     offset[2] = frame->linesize[2] * cy;

  466.     for (i = 3; i < AV_NUM_DATA_POINTERS; i++)

  467.         offset[i] = 0;

  468.     emms_c();

  469. 

  470.     s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);

  471. 

  472.     s->last_slice_end = y + h;

  473. }

  474. 

  475. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  476.                         AVPacket *avpkt)

  477. {

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

  479.     int buf_size       = avpkt->size;

  480.     HYuvContext *s = avctx->priv_data;

  481.     const int width  = s->width;

  482.     const int width2 = s->width >> 1;

  483.     const int height = s->height;

  484.     int fake_ystride, fake_ustride, fake_vstride;

  485.     ThreadFrame frame = { .f = data };

  486.     AVFrame *const p = data;

  487.     int table_size = 0;

  488. 

  489.     av_fast_malloc(&s->bitstream_buffer,

  490.                    &s->bitstream_buffer_size,

  491.                    buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  492.     if (!s->bitstream_buffer)

  493.         return AVERROR(ENOMEM);

  494. 

  495.     memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  496.     s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,

  497.                       (const uint32_t *) buf, buf_size / 4);

  498. 

  499.     if (ff_thread_get_buffer(avctx, &frame, 0) < 0) {

  500.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  501.         return -1;

  502.     }

  503. 

  504.     if (s->context) {

  505.         table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);

  506.         if (table_size < 0)

  507.             return -1;

  508.     }

  509. 

  510.     if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)

  511.         return -1;

  512. 

  513.     init_get_bits(&s->gb, s->bitstream_buffer + table_size,

  514.                   (buf_size - table_size) * 8);

  515. 

  516.     fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];

  517.     fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];

  518.     fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];

  519. 

  520.     s->last_slice_end = 0;

  521. 

  522.     if (s->bitstream_bpp < 24) {

  523.         int y, cy;

  524.         int lefty, leftu, leftv;

  525.         int lefttopy, lefttopu, lefttopv;

  526. 

  527.         if (s->yuy2) {

  528.             p->data[0][3] = get_bits(&s->gb, 8);

  529.             p->data[0][2] = get_bits(&s->gb, 8);

  530.             p->data[0][1] = get_bits(&s->gb, 8);

  531.             p->data[0][0] = get_bits(&s->gb, 8);

  532. 

  533.             avpriv_report_missing_feature(avctx, "YUY2 output");

  534.             return AVERROR_PATCHWELCOME;

  535.         } else {

  536.             leftv         =

  537.             p->data[2][0] = get_bits(&s->gb, 8);

  538.             lefty         =

  539.             p->data[0][1] = get_bits(&s->gb, 8);

  540.             leftu         =

  541.             p->data[1][0] = get_bits(&s->gb, 8);

  542.             p->data[0][0] = get_bits(&s->gb, 8);

  543. 

  544.             switch (s->predictor) {

  545.             case LEFT:

  546.             case PLANE:

  547.                 decode_422_bitstream(s, width - 2);

  548.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],

  549.                                                    width - 2, lefty);

  550.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  551.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  552.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  553.                 }

  554. 

  555.                 for (cy = y = 1; y < s->height; y++, cy++) {

  556.                     uint8_t *ydst, *udst, *vdst;

  557. 

  558.                     if (s->bitstream_bpp == 12) {

  559.                         decode_gray_bitstream(s, width);

  560. 

  561.                         ydst = p->data[0] + p->linesize[0] * y;

  562. 

  563.                         lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],

  564.                                                            width, lefty);

  565.                         if (s->predictor == PLANE) {

  566.                             if (y > s->interlaced)

  567.                                 s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  568.                         }

  569.                         y++;

  570.                         if (y >= s->height)

  571.                             break;

  572.                     }

  573. 

  574.                     draw_slice(s, p, y);

  575. 

  576.                     ydst = p->data[0] + p->linesize[0] * y;

  577.                     udst = p->data[1] + p->linesize[1] * cy;

  578.                     vdst = p->data[2] + p->linesize[2] * cy;

  579. 

  580.                     decode_422_bitstream(s, width);

  581.                     lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],

  582.                                                        width, lefty);

  583.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  584.                         leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);

  585.                         leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);

  586.                     }

  587.                     if (s->predictor == PLANE) {

  588.                         if (cy > s->interlaced) {

  589.                             s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  590.                             if (!(s->flags & CODEC_FLAG_GRAY)) {

  591.                                 s->hdsp.add_bytes(udst, udst - fake_ustride, width2);

  592.                                 s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);

  593.                             }

  594.                         }

  595.                     }

  596.                 }

  597.                 draw_slice(s, p, height);

  598. 

  599.                 break;

  600.             case MEDIAN:

  601.                 /* first line except first 2 pixels is left predicted */

  602.                 decode_422_bitstream(s, width - 2);

  603.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],

  604.                                                    width - 2, lefty);

  605.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  606.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  607.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  608.                 }

  609. 

  610.                 cy = y = 1;

  611. 

  612.                 /* second line is left predicted for interlaced case */

  613.                 if (s->interlaced) {

  614.                     decode_422_bitstream(s, width);

  615.                     lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],

  616.                                                        s->temp[0], width, lefty);

  617.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  618.                         leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  619.                         leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  620.                     }

  621.                     y++;

  622.                     cy++;

  623.                 }

  624. 

  625.                 /* next 4 pixels are left predicted too */

  626.                 decode_422_bitstream(s, 4);

  627.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,

  628.                                                    s->temp[0], 4, lefty);

  629.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  630.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  631.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  632.                 }

  633. 

  634.                 /* next line except the first 4 pixels is median predicted */

  635.                 lefttopy = p->data[0][3];

  636.                 decode_422_bitstream(s, width - 4);

  637.                 s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,

  638.                                              p->data[0] + 4, s->temp[0],

  639.                                              width - 4, &lefty, &lefttopy);

  640.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  641.                     lefttopu = p->data[1][1];

  642.                     lefttopv = p->data[2][1];

  643.                     s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  644.                     s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  645.                 }

  646.                 y++;

  647.                 cy++;

  648. 

  649.                 for (; y < height; y++, cy++) {

  650.                     uint8_t *ydst, *udst, *vdst;

  651. 

  652.                     if (s->bitstream_bpp == 12) {

  653.                         while (2 * cy > y) {

  654.                             decode_gray_bitstream(s, width);

  655.                             ydst = p->data[0] + p->linesize[0] * y;

  656.                             s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  657.                                                          s->temp[0], width,

  658.                                                          &lefty, &lefttopy);

  659.                             y++;

  660.                         }

  661.                         if (y >= height)

  662.                             break;

  663.                     }

  664.                     draw_slice(s, p, y);

  665. 

  666.                     decode_422_bitstream(s, width);

  667. 

  668.                     ydst = p->data[0] + p->linesize[0] * y;

  669.                     udst = p->data[1] + p->linesize[1] * cy;

  670.                     vdst = p->data[2] + p->linesize[2] * cy;

  671. 

  672.                     s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  673.                                                  s->temp[0], width,

  674.                                                  &lefty, &lefttopy);

  675.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  676.                         s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  677.                         s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  678.                     }

  679.                 }

  680. 

  681.                 draw_slice(s, p, height);

  682.                 break;

  683.             }

  684.         }

  685.     } else {

  686.         int y;

  687.         int leftr, leftg, leftb, lefta;

  688.         const int last_line = (height - 1) * p->linesize[0];

  689. 

  690.         if (s->bitstream_bpp == 32) {

  691.             lefta = p->data[0][last_line + A] = get_bits(&s->gb, 8);

  692.             leftr = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  693.             leftg = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  694.             leftb = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  695.         } else {

  696.             leftr = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  697.             leftg = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  698.             leftb = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  699.             lefta = p->data[0][last_line + A] = 255;

  700.             skip_bits(&s->gb, 8);

  701.         }

  702. 

  703.         if (s->bgr32) {

  704.             switch (s->predictor) {

  705.             case LEFT:

  706.             case PLANE:

  707.                 decode_bgr_bitstream(s, width - 1);

  708.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,

  709.                                                  s->temp[0], width - 1, &leftr,

  710.                                                  &leftg, &leftb, &lefta);

  711. 

  712.                 for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.

  713.                     decode_bgr_bitstream(s, width);

  714. 

  715.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,

  716.                                                      s->temp[0], width, &leftr,

  717.                                                      &leftg, &leftb, &lefta);

  718.                     if (s->predictor == PLANE) {

  719.                         if (s->bitstream_bpp != 32)

  720.                             lefta = 0;

  721.                         if ((y & s->interlaced) == 0 &&

  722.                             y < s->height - 1 - s->interlaced) {

  723.                             s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,

  724.                                               p->data[0] + p->linesize[0] * y +

  725.                                               fake_ystride, fake_ystride);

  726.                         }

  727.                     }

  728.                 }

  729.                 // just 1 large slice as this is not possible in reverse order

  730.                 draw_slice(s, p, height);

  731.                 break;

  732.             default:

  733.                 av_log(avctx, AV_LOG_ERROR,

  734.                        "prediction type not supported!\n");

  735.             }

  736.         } else {

  737.             avpriv_report_missing_feature(avctx, "BGR24 output");

  738.             return AVERROR_PATCHWELCOME;

  739.         }

  740.     }

  741.     emms_c();

  742. 

  743.     *got_frame = 1;

  744. 

  745.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  746. }

  747. 

  748. static av_cold int decode_end(AVCodecContext *avctx)

  749. {

  750.     HYuvContext *s = avctx->priv_data;

  751.     int i;

  752. 

  753.     ff_huffyuv_common_end(s);

  754.     av_freep(&s->bitstream_buffer);

  755. 

  756.     for (i = 0; i < 6; i++)

  757.         ff_free_vlc(&s->vlc[i]);

  758. 

  759.     return 0;

  760. }

  761. 

  762. AVCodec ff_huffyuv_decoder = {

  763.     .name             = "huffyuv",

  764.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  765.     .type             = AVMEDIA_TYPE_VIDEO,

  766.     .id               = AV_CODEC_ID_HUFFYUV,

  767.     .priv_data_size   = sizeof(HYuvContext),

  768.     .init             = decode_init,

  769.     .close            = decode_end,

  770.     .decode           = decode_frame,

  771.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  772.                         CODEC_CAP_FRAME_THREADS,

  773.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  774. };

  775. 

  776. #if CONFIG_FFVHUFF_DECODER

  777. AVCodec ff_ffvhuff_decoder = {

  778.     .name             = "ffvhuff",

  779.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  780.     .type             = AVMEDIA_TYPE_VIDEO,

  781.     .id               = AV_CODEC_ID_FFVHUFF,

  782.     .priv_data_size   = sizeof(HYuvContext),

  783.     .init             = decode_init,

  784.     .close            = decode_end,

  785.     .decode           = decode_frame,

  786.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  787.                         CODEC_CAP_FRAME_THREADS,

  788.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  789. };

  790. #endif /* CONFIG_FFVHUFF_DECODER */