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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 + AV_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 + AV_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 AVERROR_INVALIDDATA;

  102.         }

  103.         while (repeat--)

  104.             dst[i++] = val;

  105.     }

  106.     return 0;

  107. }

  108. 

  109. static int 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.     int ret;

  115. 

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

  117.         int p, i, y, u;

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

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

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

  121.                 int limit = VLC_BITS - len0;

  122.                 if (limit <= 0)

  123.                     continue;

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

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

  126.                     if (len1 > limit)

  127.                         continue;

  128.                     len[i]     = len0 + len1;

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

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

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

  132.                         i++;

  133.                 }

  134.             }

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

  136.             if ((ret = ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,

  137.                                           bits, 2, 2, symbols, 2, 2, 0)) < 0)

  138.                 return ret;

  139.         }

  140.     } else {

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

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

  143.         int p0 = s->decorrelate;

  144.         int p1 = !s->decorrelate;

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

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

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

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

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

  150.             int limit0 = VLC_BITS - len0;

  151.             if (limit0 < 2)

  152.                 continue;

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

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

  155.                 int limit1 = limit0 - len1;

  156.                 if (limit1 < 1)

  157.                     continue;

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

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

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

  161.                     if (len2 > limit1)

  162.                         continue;

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

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

  165.                     if (s->decorrelate) {

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

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

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

  169.                     } else {

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

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

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

  173.                     }

  174.                     i++;

  175.                 }

  176.             }

  177.         }

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

  179.         if ((ret = init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1,

  180.                             bits, 2, 2, 0)) < 0)

  181.             return ret;

  182.     }

  183.     return 0;

  184. }

  185. 

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

  187. {

  188.     GetBitContext gb;

  189.     int i, ret;

  190. 

  191.     if ((ret = init_get_bits(&gb, src, length * 8)) < 0)

  192.         return ret;

  193. 

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

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

  196.             return ret;

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

  198.             return ret;

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

  200.         if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,

  201.                             s->bits[i], 4, 4, 0)) < 0)

  202.             return ret;

  203.     }

  204. 

  205.     if ((ret = generate_joint_tables(s)) < 0)

  206.         return ret;

  207. 

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

  209. }

  210. 

  211. static int read_old_huffman_tables(HYuvContext *s)

  212. {

  213.     GetBitContext gb;

  214.     int i, ret;

  215. 

  216.     if ((ret = init_get_bits(&gb, classic_shift_luma,

  217.                              classic_shift_luma_table_size * 8)) < 0)

  218.         return ret;

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

  220.         return ret;

  221. 

  222.     if ((ret = init_get_bits(&gb, classic_shift_chroma,

  223.                              classic_shift_chroma_table_size * 8)) < 0)

  224.         return ret;

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

  226.         return ret;

  227. 

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

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

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

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

  232. 

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

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

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

  236.     }

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

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

  239. 

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

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

  242.         if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,

  243.                             s->bits[i], 4, 4, 0)) < 0)

  244.             return ret;

  245.     }

  246. 

  247.     if ((ret = generate_joint_tables(s)) < 0)

  248.         return ret;

  249. 

  250.     return 0;

  251. }

  252. 

  253. static av_cold int decode_init(AVCodecContext *avctx)

  254. {

  255.     HYuvContext *s = avctx->priv_data;

  256.     int ret;

  257. 

  258.     ff_huffyuv_common_init(avctx);

  259.     ff_huffyuvdsp_init(&s->hdsp);

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

  261. 

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

  263.     s->bgr32      = 1;

  264. 

  265.     if (avctx->extradata_size) {

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

  267.             avctx->bits_per_coded_sample != 12)

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

  269.         else

  270.             s->version = 2;

  271.     } else

  272.         s->version = 0;

  273. 

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

  275.         int method, interlace;

  276. 

  277.         if (avctx->extradata_size < 4)

  278.             return AVERROR_INVALIDDATA;

  279. 

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

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

  282.         s->predictor     = method & 63;

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

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

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

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

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

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

  289. 

  290.         if ((ret = read_huffman_tables(s, avctx->extradata + 4,

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

  292.             return ret;

  293.     } else {

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

  295.         case 1:

  296.             s->predictor   = LEFT;

  297.             s->decorrelate = 0;

  298.             break;

  299.         case 2:

  300.             s->predictor   = LEFT;

  301.             s->decorrelate = 1;

  302.             break;

  303.         case 3:

  304.             s->predictor   = PLANE;

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

  306.             break;

  307.         case 4:

  308.             s->predictor   = MEDIAN;

  309.             s->decorrelate = 0;

  310.             break;

  311.         default:

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

  313.             s->decorrelate = 0;

  314.             break;

  315.         }

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

  317.         s->context       = 0;

  318. 

  319.         if ((ret = read_old_huffman_tables(s)) < 0)

  320.             return ret;

  321.     }

  322. 

  323.     switch (s->bitstream_bpp) {

  324.     case 12:

  325.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  326.         break;

  327.     case 16:

  328.         if (s->yuy2)

  329.             avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  330.         else

  331.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  332.         break;

  333.     case 24:

  334.     case 32:

  335.         if (s->bgr32)

  336.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  337.         else

  338.             avctx->pix_fmt = AV_PIX_FMT_BGR24;

  339.         break;

  340.     default:

  341.         return AVERROR_INVALIDDATA;

  342.     }

  343. 

  344.     if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P &&

  345.         avctx->width % 4) {

  346.         av_log(avctx, AV_LOG_ERROR, "width must be multiple of 4 "

  347.                "for this combination of colorspace and predictor type.\n");

  348.         return AVERROR_INVALIDDATA;

  349.     }

  350. 

  351.     if ((ret = ff_huffyuv_alloc_temp(s)) < 0)

  352.         return ret;

  353. 

  354.     return 0;

  355. }

  356. 

  357. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  358. {

  359.     HYuvContext *s = avctx->priv_data;

  360.     int i, ret;

  361. 

  362.     if ((ret = ff_huffyuv_alloc_temp(s)) < 0)

  363.         return ret;

  364. 

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

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

  367. 

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

  369.         if ((ret = read_huffman_tables(s, avctx->extradata + 4,

  370.                                        avctx->extradata_size)) < 0)

  371.             return ret;

  372.     } else {

  373.         if ((ret = read_old_huffman_tables(s)) < 0)

  374.             return ret;

  375.     }

  376. 

  377.     return 0;

  378. }

  379. 

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

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

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

  383.     {                                                                   \

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

  385.                                  VLC_BITS, 1);                          \

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

  387.             dst0 = code >> 8;                                           \

  388.             dst1 = code;                                                \

  389.         } else {                                                        \

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

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

  392.         }                                                               \

  393.     }

  394. 

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

  396. {

  397.     int i;

  398. 

  399.     count /= 2;

  400. 

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

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

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

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

  405.         }

  406.     } else {

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

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

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

  410.         }

  411.     }

  412. }

  413. 

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

  415. {

  416.     int i;

  417. 

  418.     count /= 2;

  419. 

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

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

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

  423.         }

  424.     } else {

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

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

  427.         }

  428.     }

  429. }

  430. 

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

  432.                                           int decorrelate, int alpha)

  433. {

  434.     int i;

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

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

  437.         if (code != -1) {

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

  439.         } else if (decorrelate) {

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

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

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

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

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

  445.         } else {

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

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

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

  449.         }

  450.         if (alpha)

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

  452.     }

  453. }

  454. 

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

  456. {

  457.     if (s->decorrelate) {

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

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

  460.         else

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

  462.     } else {

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

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

  465.         else

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

  467.     }

  468. }

  469. 

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

  471. {

  472.     int h, cy, i;

  473.     int offset[AV_NUM_DATA_POINTERS];

  474. 

  475.     if (!s->avctx->draw_horiz_band)

  476.         return;

  477. 

  478.     h  = y - s->last_slice_end;

  479.     y -= h;

  480. 

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

  482.         cy = y >> 1;

  483.     else

  484.         cy = y;

  485. 

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

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

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

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

  490.         offset[i] = 0;

  491.     emms_c();

  492. 

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

  494. 

  495.     s->last_slice_end = y + h;

  496. }

  497. 

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

  499.                         AVPacket *avpkt)

  500. {

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

  502.     int buf_size       = avpkt->size;

  503.     HYuvContext *s = avctx->priv_data;

  504.     const int width  = s->width;

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

  506.     const int height = s->height;

  507.     int fake_ystride, fake_ustride, fake_vstride;

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

  509.     AVFrame *const p = data;

  510.     int table_size = 0, ret;

  511. 

  512.     av_fast_malloc(&s->bitstream_buffer,

  513.                    &s->bitstream_buffer_size,

  514.                    buf_size + AV_INPUT_BUFFER_PADDING_SIZE);

  515.     if (!s->bitstream_buffer)

  516.         return AVERROR(ENOMEM);

  517. 

  518.     memset(s->bitstream_buffer + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

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

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

  521. 

  522.     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {

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

  524.         return ret;

  525.     }

  526. 

  527.     if (s->context) {

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

  529.         if (table_size < 0)

  530.             return table_size;

  531.     }

  532. 

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

  534.         return AVERROR_INVALIDDATA;

  535. 

  536.     if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,

  537.                              (buf_size - table_size) * 8)) < 0)

  538.         return ret;

  539. 

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

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

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

  543. 

  544.     s->last_slice_end = 0;

  545. 

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

  547.         int y, cy;

  548.         int lefty, leftu, leftv;

  549.         int lefttopy, lefttopu, lefttopv;

  550. 

  551.         if (s->yuy2) {

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

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

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

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

  556. 

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

  558.             return AVERROR_PATCHWELCOME;

  559.         } else {

  560.             leftv         =

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

  562.             lefty         =

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

  564.             leftu         =

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

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

  567. 

  568.             switch (s->predictor) {

  569.             case LEFT:

  570.             case PLANE:

  571.                 decode_422_bitstream(s, width - 2);

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

  573.                                                    width - 2, lefty);

  574.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  577.                 }

  578. 

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

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

  581. 

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

  583.                         decode_gray_bitstream(s, width);

  584. 

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

  586. 

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

  588.                                                            width, lefty);

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

  590.                             if (y > s->interlaced)

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

  592.                         }

  593.                         y++;

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

  595.                             break;

  596.                     }

  597. 

  598.                     draw_slice(s, p, y);

  599. 

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

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

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

  603. 

  604.                     decode_422_bitstream(s, width);

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

  606.                                                        width, lefty);

  607.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  610.                     }

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

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

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

  614.                             if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  617.                             }

  618.                         }

  619.                     }

  620.                 }

  621.                 draw_slice(s, p, height);

  622. 

  623.                 break;

  624.             case MEDIAN:

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

  626.                 decode_422_bitstream(s, width - 2);

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

  628.                                                    width - 2, lefty);

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

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

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

  632.                 }

  633. 

  634.                 cy = y = 1;

  635. 

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

  637.                 if (s->interlaced) {

  638.                     decode_422_bitstream(s, width);

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

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

  641.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  644.                     }

  645.                     y++;

  646.                     cy++;

  647.                 }

  648. 

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

  650.                 decode_422_bitstream(s, 4);

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

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

  653.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  656.                 }

  657. 

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

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

  660.                 decode_422_bitstream(s, width - 4);

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

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

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

  664.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

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

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

  669.                 }

  670.                 y++;

  671.                 cy++;

  672. 

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

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

  675. 

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

  677.                         while (2 * cy > y) {

  678.                             decode_gray_bitstream(s, width);

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

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

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

  682.                                                          &lefty, &lefttopy);

  683.                             y++;

  684.                         }

  685.                         if (y >= height)

  686.                             break;

  687.                     }

  688.                     draw_slice(s, p, y);

  689. 

  690.                     decode_422_bitstream(s, width);

  691. 

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

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

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

  695. 

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

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

  698.                                                  &lefty, &lefttopy);

  699.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  702.                     }

  703.                 }

  704. 

  705.                 draw_slice(s, p, height);

  706.                 break;

  707.             }

  708.         }

  709.     } else {

  710.         int y;

  711.         int leftr, leftg, leftb, lefta;

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

  713. 

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

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

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

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

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

  719.         } else {

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

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

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

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

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

  725.         }

  726. 

  727.         if (s->bgr32) {

  728.             switch (s->predictor) {

  729.             case LEFT:

  730.             case PLANE:

  731.                 decode_bgr_bitstream(s, width - 1);

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

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

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

  735. 

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

  737.                     decode_bgr_bitstream(s, width);

  738. 

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

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

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

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

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

  744.                             lefta = 0;

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

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

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

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

  749.                                               fake_ystride, fake_ystride);

  750.                         }

  751.                     }

  752.                 }

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

  754.                 draw_slice(s, p, height);

  755.                 break;

  756.             default:

  757.                 av_log(avctx, AV_LOG_ERROR,

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

  759.             }

  760.         } else {

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

  762.             return AVERROR_PATCHWELCOME;

  763.         }

  764.     }

  765.     emms_c();

  766. 

  767.     *got_frame = 1;

  768. 

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

  770. }

  771. 

  772. static av_cold int decode_end(AVCodecContext *avctx)

  773. {

  774.     HYuvContext *s = avctx->priv_data;

  775.     int i;

  776. 

  777.     ff_huffyuv_common_end(s);

  778.     av_freep(&s->bitstream_buffer);

  779. 

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

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

  782. 

  783.     return 0;

  784. }

  785. 

  786. AVCodec ff_huffyuv_decoder = {

  787.     .name             = "huffyuv",

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

  789.     .type             = AVMEDIA_TYPE_VIDEO,

  790.     .id               = AV_CODEC_ID_HUFFYUV,

  791.     .priv_data_size   = sizeof(HYuvContext),

  792.     .init             = decode_init,

  793.     .close            = decode_end,

  794.     .decode           = decode_frame,

  795.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  796.                         AV_CODEC_CAP_FRAME_THREADS,

  797.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  798. };

  799. 

  800. #if CONFIG_FFVHUFF_DECODER

  801. AVCodec ff_ffvhuff_decoder = {

  802.     .name             = "ffvhuff",

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

  804.     .type             = AVMEDIA_TYPE_VIDEO,

  805.     .id               = AV_CODEC_ID_FFVHUFF,

  806.     .priv_data_size   = sizeof(HYuvContext),

  807.     .init             = decode_init,

  808.     .close            = decode_end,

  809.     .decode           = decode_frame,

  810.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  811.                         AV_CODEC_CAP_FRAME_THREADS,

  812.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  813. };

  814. #endif /* CONFIG_FFVHUFF_DECODER */