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FFmpeg/libavcodec/huffyuvdec.c

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  1. /*

  2.  * huffyuv decoder

  3.  *

  4.  * Copyright (c) 2002-2014 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 FFmpeg.

  10.  *

  11.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

  24.  *

  25.  * yuva, gray, 4:4:4, 4:1:1, 4:1:0 and >8 bit per sample support sponsored by NOA

  26.  */

  27. 

  28. /**

  29.  * @file

  30.  * huffyuv decoder

  31.  */

  32. 

  33. #define UNCHECKED_BITSTREAM_READER 1

  34. 

  35. #include "avcodec.h"

  36. #include "get_bits.h"

  37. #include "huffyuv.h"

  38. #include "huffyuvdsp.h"

  39. #include "lossless_videodsp.h"

  40. #include "thread.h"

  41. #include "libavutil/imgutils.h"

  42. #include "libavutil/pixdesc.h"

  43. 

  44. #define classic_shift_luma_table_size 42

  45. static const unsigned char classic_shift_luma[classic_shift_luma_table_size + AV_INPUT_BUFFER_PADDING_SIZE] = {

  46.     34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,

  47.     14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,

  48.     10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0,

  49.   0,0,0,0,0,0,0,0,

  50. };

  51. 

  52. #define classic_shift_chroma_table_size 59

  53. static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + AV_INPUT_BUFFER_PADDING_SIZE] = {

  54.     66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,

  55.     84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,

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

  57.     78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0,

  58.   0,0,0,0,0,0,0,0,

  59. };

  60. 

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

  62.      3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  63.     73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  64.     68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  65.     35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  66.     37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  67.     35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  68.     27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  69.     15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  70.     12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  71.     12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  72.     18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  73.     28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  74.     28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  75.     62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  76.     54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  77.     46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  78. };

  79. 

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

  81.      3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,

  82.      7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,

  83.      11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,

  84.      43,  45,  76,  81,  46,  82,  75,  55,  56, 144,  58,  80,  60,  74, 147,  63,

  85.     143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,

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

  87.      17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,

  88.     112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,

  89.       0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,

  90.     135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,

  91.      52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,

  92.      19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,

  93.       7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,

  94.      83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,

  95.      14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,

  96.       6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,

  97. };

  98. 

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

  100. {

  101.     int i, val, repeat;

  102. 

  103.     for (i = 0; i < n;) {

  104.         repeat = get_bits(gb, 3);

  105.         val    = get_bits(gb, 5);

  106.         if (repeat == 0)

  107.             repeat = get_bits(gb, 8);

  108.         if (i + repeat > n || get_bits_left(gb) < 0) {

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

  110.             return AVERROR_INVALIDDATA;

  111.         }

  112.         while (repeat--)

  113.             dst[i++] = val;

  114.     }

  115.     return 0;

  116. }

  117. 

  118. static int generate_joint_tables(HYuvContext *s)

  119. {

  120.     int ret;

  121.     uint16_t *symbols = av_mallocz(5 << VLC_BITS);

  122.     uint16_t *bits;

  123.     uint8_t *len;

  124.     if (!symbols)

  125.         return AVERROR(ENOMEM);

  126.     bits = symbols + (1 << VLC_BITS);

  127.     len = (uint8_t *)(bits + (1 << VLC_BITS));

  128. 

  129.     if (s->bitstream_bpp < 24 || s->version > 2) {

  130.         int p, i, y, u;

  131.         for (p = 0; p < 4; p++) {

  132.             int p0 = s->version > 2 ? p : 0;

  133.             for (i = y = 0; y < s->vlc_n; y++) {

  134.                 int len0  = s->len[p0][y];

  135.                 int limit = VLC_BITS - len0;

  136.                 if (limit <= 0 || !len0)

  137.                     continue;

  138.                 if ((sign_extend(y, 8) & (s->vlc_n-1)) != y)

  139.                     continue;

  140.                 for (u = 0; u < s->vlc_n; u++) {

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

  142.                     if (len1 > limit || !len1)

  143.                         continue;

  144.                     if ((sign_extend(u, 8) & (s->vlc_n-1)) != u)

  145.                         continue;

  146.                     av_assert0(i < (1 << VLC_BITS));

  147.                     len[i]     = len0 + len1;

  148.                     bits[i]    = (s->bits[p0][y] << len1) + s->bits[p][u];

  149.                     symbols[i] = (y << 8) + (u & 0xFF);

  150.                         i++;

  151.                 }

  152.             }

  153.             ff_free_vlc(&s->vlc[4 + p]);

  154.             if ((ret = ff_init_vlc_sparse(&s->vlc[4 + p], VLC_BITS, i, len, 1, 1,

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

  156.                 goto out;

  157.         }

  158.     } else {

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

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

  161.         int p0 = s->decorrelate;

  162.         int p1 = !s->decorrelate;

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

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

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

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

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

  168.             int limit0 = VLC_BITS - len0;

  169.             if (limit0 < 2 || !len0)

  170.                 continue;

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

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

  173.                 int limit1 = limit0 - len1;

  174.                 if (limit1 < 1 || !len1)

  175.                     continue;

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

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

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

  179.                     if (len2 > limit1 || !len2)

  180.                         continue;

  181.                     av_assert0(i < (1 << VLC_BITS));

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

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

  184.                     if (s->decorrelate) {

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

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

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

  188.                     } else {

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

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

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

  192.                     }

  193.                     i++;

  194.                 }

  195.             }

  196.         }

  197.         ff_free_vlc(&s->vlc[4]);

  198.         if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1,

  199.                             bits, 2, 2, 0)) < 0)

  200.             goto out;

  201.     }

  202.     ret = 0;

  203. out:

  204.     av_freep(&symbols);

  205.     return ret;

  206. }

  207. 

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

  209. {

  210.     GetBitContext gb;

  211.     int i, ret;

  212.     int count = 3;

  213. 

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

  215.         return ret;

  216. 

  217.     if (s->version > 2)

  218.         count = 1 + s->alpha + 2*s->chroma;

  219. 

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

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

  222.             return ret;

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

  224.             return ret;

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

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

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

  228.             return ret;

  229.     }

  230. 

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

  232.         return ret;

  233. 

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

  235. }

  236. 

  237. static int read_old_huffman_tables(HYuvContext *s)

  238. {

  239.     GetBitContext gb;

  240.     int i, ret;

  241. 

  242.     init_get_bits(&gb, classic_shift_luma,

  243.                   classic_shift_luma_table_size * 8);

  244.     if ((ret = read_len_table(s->len[0], &gb, 256)) < 0)

  245.         return ret;

  246. 

  247.     init_get_bits(&gb, classic_shift_chroma,

  248.                   classic_shift_chroma_table_size * 8);

  249.     if ((ret = read_len_table(s->len[1], &gb, 256)) < 0)

  250.         return ret;

  251. 

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

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

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

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

  256. 

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

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

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

  260.     }

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

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

  263. 

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

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

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

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

  268.             return ret;

  269.     }

  270. 

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

  272.         return ret;

  273. 

  274.     return 0;

  275. }

  276. 

  277. static av_cold int decode_end(AVCodecContext *avctx)

  278. {

  279.     HYuvContext *s = avctx->priv_data;

  280.     int i;

  281. 

  282.     ff_huffyuv_common_end(s);

  283.     av_freep(&s->bitstream_buffer);

  284. 

  285.     for (i = 0; i < 8; i++)

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

  287. 

  288.     return 0;

  289. }

  290. 

  291. static av_cold int decode_init(AVCodecContext *avctx)

  292. {

  293.     HYuvContext *s = avctx->priv_data;

  294.     int ret;

  295. 

  296.     ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);

  297.     if (ret < 0)

  298.         return ret;

  299. 

  300.     ff_huffyuvdsp_init(&s->hdsp, avctx->pix_fmt);

  301.     ff_llviddsp_init(&s->llviddsp);

  302.     memset(s->vlc, 0, 4 * sizeof(VLC));

  303. 

  304.     s->interlaced = avctx->height > 288;

  305.     s->bgr32      = 1;

  306. 

  307.     if (avctx->extradata_size) {

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

  309.             avctx->bits_per_coded_sample != 12)

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

  311.         else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)

  312.             s->version = 2;

  313.         else

  314.             s->version = 3;

  315.     } else

  316.         s->version = 0;

  317. 

  318.     s->bps = 8;

  319.     s->n = 1<<s->bps;

  320.     s->vlc_n = FFMIN(s->n, MAX_VLC_N);

  321.     s->chroma = 1;

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

  323.         int method, interlace;

  324. 

  325.         if (avctx->extradata_size < 4)

  326.             return AVERROR_INVALIDDATA;

  327. 

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

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

  330.         s->predictor     = method & 63;

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

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

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

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

  335.         } else {

  336.             s->bps = (avctx->extradata[1] >> 4) + 1;

  337.             s->n = 1<<s->bps;

  338.             s->vlc_n = FFMIN(s->n, MAX_VLC_N);

  339.             s->chroma_h_shift = avctx->extradata[1] & 3;

  340.             s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;

  341.             s->yuv   = !!(avctx->extradata[2] & 1);

  342.             s->chroma= !!(avctx->extradata[2] & 3);

  343.             s->alpha = !!(avctx->extradata[2] & 4);

  344.         }

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

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

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

  348. 

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

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

  351.             goto error;

  352.     } else {

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

  354.         case 1:

  355.             s->predictor   = LEFT;

  356.             s->decorrelate = 0;

  357.             break;

  358.         case 2:

  359.             s->predictor   = LEFT;

  360.             s->decorrelate = 1;

  361.             break;

  362.         case 3:

  363.             s->predictor   = PLANE;

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

  365.             break;

  366.         case 4:

  367.             s->predictor   = MEDIAN;

  368.             s->decorrelate = 0;

  369.             break;

  370.         default:

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

  372.             s->decorrelate = 0;

  373.             break;

  374.         }

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

  376.         s->context       = 0;

  377. 

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

  379.             goto error;

  380.     }

  381. 

  382.     if (s->version <= 2) {

  383.         switch (s->bitstream_bpp) {

  384.         case 12:

  385.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  386.             s->yuv = 1;

  387.             break;

  388.         case 16:

  389.             if (s->yuy2)

  390.                 avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  391.             else

  392.                 avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  393.             s->yuv = 1;

  394.             break;

  395.         case 24:

  396.             if (s->bgr32)

  397.                 avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  398.             else

  399.                 avctx->pix_fmt = AV_PIX_FMT_BGR24;

  400.             break;

  401.         case 32:

  402.             av_assert0(s->bgr32);

  403.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  404.             s->alpha = 1;

  405.             break;

  406.         default:

  407.             ret = AVERROR_INVALIDDATA;

  408.             goto error;

  409.         }

  410.         av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,

  411.                                          &s->chroma_h_shift,

  412.                                          &s->chroma_v_shift);

  413.     } else {

  414.         switch ( (s->chroma<<10) | (s->yuv<<9) | (s->alpha<<8) | ((s->bps-1)<<4) | s->chroma_h_shift | (s->chroma_v_shift<<2)) {

  415.         case 0x070:

  416.             avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  417.             break;

  418.         case 0x0F0:

  419.             avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  420.             break;

  421.         case 0x470:

  422.             avctx->pix_fmt = AV_PIX_FMT_GBRP;

  423.             break;

  424.         case 0x480:

  425.             avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  426.             break;

  427.         case 0x490:

  428.             avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  429.             break;

  430.         case 0x4B0:

  431.             avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  432.             break;

  433.         case 0x4D0:

  434.             avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  435.             break;

  436.         case 0x4F0:

  437.             avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  438.             break;

  439.         case 0x570:

  440.             avctx->pix_fmt = AV_PIX_FMT_GBRAP;

  441.             break;

  442.         case 0x670:

  443.             avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  444.             break;

  445.         case 0x680:

  446.             avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  447.             break;

  448.         case 0x690:

  449.             avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  450.             break;

  451.         case 0x6B0:

  452.             avctx->pix_fmt = AV_PIX_FMT_YUV444P12;

  453.             break;

  454.         case 0x6D0:

  455.             avctx->pix_fmt = AV_PIX_FMT_YUV444P14;

  456.             break;

  457.         case 0x6F0:

  458.             avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  459.             break;

  460.         case 0x671:

  461.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  462.             break;

  463.         case 0x681:

  464.             avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  465.             break;

  466.         case 0x691:

  467.             avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  468.             break;

  469.         case 0x6B1:

  470.             avctx->pix_fmt = AV_PIX_FMT_YUV422P12;

  471.             break;

  472.         case 0x6D1:

  473.             avctx->pix_fmt = AV_PIX_FMT_YUV422P14;

  474.             break;

  475.         case 0x6F1:

  476.             avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  477.             break;

  478.         case 0x672:

  479.             avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  480.             break;

  481.         case 0x674:

  482.             avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  483.             break;

  484.         case 0x675:

  485.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  486.             break;

  487.         case 0x685:

  488.             avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  489.             break;

  490.         case 0x695:

  491.             avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  492.             break;

  493.         case 0x6B5:

  494.             avctx->pix_fmt = AV_PIX_FMT_YUV420P12;

  495.             break;

  496.         case 0x6D5:

  497.             avctx->pix_fmt = AV_PIX_FMT_YUV420P14;

  498.             break;

  499.         case 0x6F5:

  500.             avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  501.             break;

  502.         case 0x67A:

  503.             avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  504.             break;

  505.         case 0x770:

  506.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  507.             break;

  508.         case 0x780:

  509.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;

  510.             break;

  511.         case 0x790:

  512.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;

  513.             break;

  514.         case 0x7F0:

  515.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  516.             break;

  517.         case 0x771:

  518.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  519.             break;

  520.         case 0x781:

  521.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;

  522.             break;

  523.         case 0x791:

  524.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;

  525.             break;

  526.         case 0x7F1:

  527.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  528.             break;

  529.         case 0x775:

  530.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  531.             break;

  532.         case 0x785:

  533.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;

  534.             break;

  535.         case 0x795:

  536.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;

  537.             break;

  538.         case 0x7F5:

  539.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;

  540.             break;

  541.         default:

  542.             ret = AVERROR_INVALIDDATA;

  543.             goto error;

  544.         }

  545.     }

  546. 

  547.     ff_huffyuv_common_init(avctx);

  548. 

  549.     if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {

  550.         av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");

  551.         ret = AVERROR_INVALIDDATA;

  552.         goto error;

  553.     }

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

  555.         avctx->width % 4) {

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

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

  558.         ret = AVERROR_INVALIDDATA;

  559.         goto error;

  560.     }

  561. 

  562.     if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {

  563.         ff_huffyuv_common_end(s);

  564.         goto error;

  565.     }

  566. 

  567.     return 0;

  568.   error:

  569.     decode_end(avctx);

  570.     return ret;

  571. }

  572. 

  573. /** Subset of GET_VLC for use in hand-roller VLC code */

  574. #define VLC_INTERN(dst, table, gb, name, bits, max_depth)   \

  575.     code = table[index][0];                                 \

  576.     n    = table[index][1];                                 \

  577.     if (max_depth > 1 && n < 0) {                           \

  578.         LAST_SKIP_BITS(name, gb, bits);                     \

  579.         UPDATE_CACHE(name, gb);                             \

  580.                                                             \

  581.         nb_bits = -n;                                       \

  582.         index   = SHOW_UBITS(name, gb, nb_bits) + code;     \

  583.         code    = table[index][0];                          \

  584.         n       = table[index][1];                          \

  585.         if (max_depth > 2 && n < 0) {                       \

  586.             LAST_SKIP_BITS(name, gb, nb_bits);              \

  587.             UPDATE_CACHE(name, gb);                         \

  588.                                                             \

  589.             nb_bits = -n;                                   \

  590.             index   = SHOW_UBITS(name, gb, nb_bits) + code; \

  591.             code    = table[index][0];                      \

  592.             n       = table[index][1];                      \

  593.         }                                                   \

  594.     }                                                       \

  595.     dst = code;                                             \

  596.     LAST_SKIP_BITS(name, gb, n)

  597. 

  598. 

  599. #define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2,  \

  600.                      bits, max_depth, OP)                           \

  601.     do {                                                            \

  602.         unsigned int index = SHOW_UBITS(name, gb, bits);            \

  603.         int          code, n = dtable[index][1];                    \

  604.                                                                     \

  605.         if (n<=0) {                                                 \

  606.             int nb_bits;                                            \

  607.             VLC_INTERN(dst0, table1, gb, name, bits, max_depth);    \

  608.                                                                     \

  609.             UPDATE_CACHE(re, gb);                                   \

  610.             index = SHOW_UBITS(name, gb, bits);                     \

  611.             VLC_INTERN(dst1, table2, gb, name, bits, max_depth);    \

  612.         } else {                                                    \

  613.             code = dtable[index][0];                                \

  614.             OP(dst0, dst1, code);                                   \

  615.             LAST_SKIP_BITS(name, gb, n);                            \

  616.         }                                                           \

  617.     } while (0)

  618. 

  619. #define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code

  620. 

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

  622.     UPDATE_CACHE(re, &s->gb);                                           \

  623.     GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table,        \

  624.                  s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)

  625. 

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

  627. {

  628.     int i, icount;

  629.     OPEN_READER(re, &s->gb);

  630.     count /= 2;

  631. 

  632.     icount = get_bits_left(&s->gb) / (32 * 4);

  633.     if (count >= icount) {

  634.         for (i = 0; i < icount; i++) {

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

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

  637.         }

  638.         for (; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {

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

  640.             if (BITS_LEFT(re, &s->gb) <= 0) break;

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

  642.         }

  643.         for (; i < count; i++)

  644.             s->temp[0][2 * i    ] = s->temp[1][i] =

  645.             s->temp[0][2 * i + 1] = s->temp[2][i] = 0;

  646.     } else {

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

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

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

  650.         }

  651.     }

  652.     CLOSE_READER(re, &s->gb);

  653. }

  654. 

  655. #define READ_2PIX_PLANE(dst0, dst1, plane, OP) \

  656.     UPDATE_CACHE(re, &s->gb); \

  657.     GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \

  658.                  s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)

  659. 

  660. #define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8)

  661. 

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

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

  664. #define READ_2PIX_PLANE16(dst0, dst1, plane){\

  665.     dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\

  666.     dst0 += get_bits(&s->gb, 2);\

  667.     dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\

  668.     dst1 += get_bits(&s->gb, 2);\

  669. }

  670. static void decode_plane_bitstream(HYuvContext *s, int width, int plane)

  671. {

  672.     int i, count = width/2;

  673. 

  674.     if (s->bps <= 8) {

  675.         OPEN_READER(re, &s->gb);

  676.         if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {

  677.             for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {

  678.                 READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);

  679.             }

  680.         } else {

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

  682.                 READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);

  683.             }

  684.         }

  685.         if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {

  686.             unsigned int index;

  687.             int nb_bits, code, n;

  688.             UPDATE_CACHE(re, &s->gb);

  689.             index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  690.             VLC_INTERN(s->temp[0][width-1], s->vlc[plane].table,

  691.                        &s->gb, re, VLC_BITS, 3);

  692.         }

  693.         CLOSE_READER(re, &s->gb);

  694.     } else if (s->bps <= 14) {

  695.         OPEN_READER(re, &s->gb);

  696.         if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {

  697.             for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {

  698.                 READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);

  699.             }

  700.         } else {

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

  702.                 READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);

  703.             }

  704.         }

  705.         if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {

  706.             unsigned int index;

  707.             int nb_bits, code, n;

  708.             UPDATE_CACHE(re, &s->gb);

  709.             index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  710.             VLC_INTERN(s->temp16[0][width-1], s->vlc[plane].table,

  711.                        &s->gb, re, VLC_BITS, 3);

  712.         }

  713.         CLOSE_READER(re, &s->gb);

  714.     } else {

  715.         if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {

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

  717.                 READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);

  718.             }

  719.         } else {

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

  721.                 READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);

  722.             }

  723.         }

  724.         if( width&1 && get_bits_left(&s->gb)>0 ) {

  725.             int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;

  726.             s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);

  727.         }

  728.     }

  729. }

  730. 

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

  732. {

  733.     int i;

  734.     OPEN_READER(re, &s->gb);

  735.     count /= 2;

  736. 

  737.     if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {

  738.         for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {

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

  740.         }

  741.     } else {

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

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

  744.         }

  745.     }

  746.     CLOSE_READER(re, &s->gb);

  747. }

  748. 

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

  750.                                           int decorrelate, int alpha)

  751. {

  752.     int i;

  753.     OPEN_READER(re, &s->gb);

  754. 

  755.     for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {

  756.         unsigned int index;

  757.         int code, n, nb_bits;

  758. 

  759.         UPDATE_CACHE(re, &s->gb);

  760.         index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  761.         n     = s->vlc[4].table[index][1];

  762. 

  763.         if (n>0) {

  764.             code  = s->vlc[4].table[index][0];

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

  766.             LAST_SKIP_BITS(re, &s->gb, n);

  767.         } else {

  768.             if (decorrelate) {

  769.                 VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,

  770.                            &s->gb, re, VLC_BITS, 3);

  771. 

  772.                 UPDATE_CACHE(re, &s->gb);

  773.                 index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  774.                 VLC_INTERN(code, s->vlc[0].table, &s->gb, re, VLC_BITS, 3);

  775.                 s->temp[0][4 * i + B] = code + s->temp[0][4 * i + G];

  776. 

  777.                 UPDATE_CACHE(re, &s->gb);

  778.                 index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  779.                 VLC_INTERN(code, s->vlc[2].table, &s->gb, re, VLC_BITS, 3);

  780.                 s->temp[0][4 * i + R] = code + s->temp[0][4 * i + G];

  781.             } else {

  782.                 VLC_INTERN(s->temp[0][4 * i + B], s->vlc[0].table,

  783.                            &s->gb, re, VLC_BITS, 3);

  784. 

  785.                 UPDATE_CACHE(re, &s->gb);

  786.                 index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  787.                 VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,

  788.                            &s->gb, re, VLC_BITS, 3);

  789. 

  790.                 UPDATE_CACHE(re, &s->gb);

  791.                 index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  792.                 VLC_INTERN(s->temp[0][4 * i + R], s->vlc[2].table,

  793.                            &s->gb, re, VLC_BITS, 3);

  794.             }

  795.         }

  796.         if (alpha) {

  797.             UPDATE_CACHE(re, &s->gb);

  798.             index = SHOW_UBITS(re, &s->gb, VLC_BITS);

  799.             VLC_INTERN(s->temp[0][4 * i + A], s->vlc[2].table,

  800.                        &s->gb, re, VLC_BITS, 3);

  801.         } else

  802.             s->temp[0][4 * i + A] = 0;

  803.     }

  804.     CLOSE_READER(re, &s->gb);

  805. }

  806. 

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

  808. {

  809.     if (s->decorrelate) {

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

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

  812.         else

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

  814.     } else {

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

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

  817.         else

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

  819.     }

  820. }

  821. 

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

  823. {

  824.     int h, cy, i;

  825.     int offset[AV_NUM_DATA_POINTERS];

  826. 

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

  828.         return;

  829. 

  830.     h  = y - s->last_slice_end;

  831.     y -= h;

  832. 

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

  834.         cy = y >> 1;

  835.     else

  836.         cy = y;

  837. 

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

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

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

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

  842.         offset[i] = 0;

  843.     emms_c();

  844. 

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

  846. 

  847.     s->last_slice_end = y + h;

  848. }

  849. 

  850. static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)

  851. {

  852.     if (s->bps <= 8) {

  853.         return s->llviddsp.add_left_pred(dst, src, w, acc);

  854.     } else {

  855.         return s->llviddsp.add_left_pred_int16((      uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);

  856.     }

  857. }

  858. 

  859. static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)

  860. {

  861.     if (s->bps <= 8) {

  862.         s->llviddsp.add_bytes(dst, src, w);

  863.     } else {

  864.         s->hdsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);

  865.     }

  866. }

  867. 

  868. static void add_median_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, const uint8_t *diff, int w, int *left, int *left_top)

  869. {

  870.     if (s->bps <= 8) {

  871.         s->llviddsp.add_median_pred(dst, src, diff, w, left, left_top);

  872.     } else {

  873.         s->hdsp.add_hfyu_median_pred_int16((uint16_t *)dst, (const uint16_t *)src, (const uint16_t *)diff, s->n-1, w, left, left_top);

  874.     }

  875. }

  876. 

  877. static int decode_slice(AVCodecContext *avctx, AVFrame *p, int height,

  878.                         int buf_size, int y_offset, int table_size)

  879. {

  880.     HYuvContext *s = avctx->priv_data;

  881.     int fake_ystride, fake_ustride, fake_vstride;

  882.     const int width  = s->width;

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

  884.     int ret;

  885. 

  886.     if ((ret = init_get_bits8(&s->gb, s->bitstream_buffer + table_size, buf_size - table_size)) < 0)

  887.         return ret;

  888. 

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

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

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

  892. 

  893.     if (s->version > 2) {

  894.         int plane;

  895.         for(plane = 0; plane < 1 + 2*s->chroma + s->alpha; plane++) {

  896.             int left, lefttop, y;

  897.             int w = width;

  898.             int h = height;

  899.             int fake_stride = fake_ystride;

  900. 

  901.             if (s->chroma && (plane == 1 || plane == 2)) {

  902.                 w >>= s->chroma_h_shift;

  903.                 h >>= s->chroma_v_shift;

  904.                 fake_stride = plane == 1 ? fake_ustride : fake_vstride;

  905.             }

  906. 

  907.             switch (s->predictor) {

  908.             case LEFT:

  909.             case PLANE:

  910.                 decode_plane_bitstream(s, w, plane);

  911.                 left = left_prediction(s, p->data[plane], s->temp[0], w, 0);

  912. 

  913.                 for (y = 1; y < h; y++) {

  914.                     uint8_t *dst = p->data[plane] + p->linesize[plane]*y;

  915. 

  916.                     decode_plane_bitstream(s, w, plane);

  917.                     left = left_prediction(s, dst, s->temp[0], w, left);

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

  919.                         if (y > s->interlaced) {

  920.                             add_bytes(s, dst, dst - fake_stride, w);

  921.                         }

  922.                     }

  923.                 }

  924. 

  925.                 break;

  926.             case MEDIAN:

  927.                 decode_plane_bitstream(s, w, plane);

  928.                 left= left_prediction(s, p->data[plane], s->temp[0], w, 0);

  929. 

  930.                 y = 1;

  931.                 if (y >= h)

  932.                     break;

  933. 

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

  935.                 if (s->interlaced) {

  936.                     decode_plane_bitstream(s, w, plane);

  937.                     left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);

  938.                     y++;

  939.                     if (y >= h)

  940.                         break;

  941.                 }

  942. 

  943.                 lefttop = p->data[plane][0];

  944.                 decode_plane_bitstream(s, w, plane);

  945.                 add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);

  946.                 y++;

  947. 

  948.                 for (; y<h; y++) {

  949.                     uint8_t *dst;

  950. 

  951.                     decode_plane_bitstream(s, w, plane);

  952. 

  953.                     dst = p->data[plane] + p->linesize[plane] * y;

  954. 

  955.                     add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);

  956.                 }

  957. 

  958.                 break;

  959.             }

  960.         }

  961.         draw_slice(s, p, height);

  962.     } else if (s->bitstream_bpp < 24) {

  963.         int y, cy;

  964.         int lefty, leftu, leftv;

  965.         int lefttopy, lefttopu, lefttopv;

  966. 

  967.         if (s->yuy2) {

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

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

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

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

  972. 

  973.             av_log(avctx, AV_LOG_ERROR,

  974.                    "YUY2 output is not implemented yet\n");

  975.             return AVERROR_PATCHWELCOME;

  976.         } else {

  977.             leftv         =

  978.             p->data[2][0 + y_offset * p->linesize[2]] = get_bits(&s->gb, 8);

  979.             lefty         =

  980.             p->data[0][1 + y_offset * p->linesize[0]] = get_bits(&s->gb, 8);

  981.             leftu         =

  982.             p->data[1][0 + y_offset * p->linesize[1]] = get_bits(&s->gb, 8);

  983.             p->data[0][0 + y_offset * p->linesize[0]] = get_bits(&s->gb, 8);

  984. 

  985.             switch (s->predictor) {

  986.             case LEFT:

  987.             case PLANE:

  988.                 decode_422_bitstream(s, width - 2);

  989.                 lefty = s->llviddsp.add_left_pred(p->data[0] + p->linesize[0] * y_offset + 2, s->temp[0],

  990.                                                    width - 2, lefty);

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

  992.                     leftu = s->llviddsp.add_left_pred(p->data[1] + p->linesize[1] * y_offset + 1, s->temp[1], width2 - 1, leftu);

  993.                     leftv = s->llviddsp.add_left_pred(p->data[2] + p->linesize[2] * y_offset + 1, s->temp[2], width2 - 1, leftv);

  994.                 }

  995. 

  996.                 for (cy = y = 1; y < height; y++, cy++) {

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

  998. 

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

  1000.                         decode_gray_bitstream(s, width);

  1001. 

  1002.                         ydst = p->data[0] + p->linesize[0] * (y + y_offset);

  1003. 

  1004.                         lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],

  1005.                                                            width, lefty);

  1006.                         if (s->predictor == PLANE) {

  1007.                             if (y > s->interlaced)

  1008.                                 s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);

  1009.                         }

  1010.                         y++;

  1011.                         if (y >= height)

  1012.                             break;

  1013.                     }

  1014. 

  1015.                     draw_slice(s, p, y);

  1016. 

  1017.                     ydst = p->data[0] + p->linesize[0] * (y  + y_offset);

  1018.                     udst = p->data[1] + p->linesize[1] * (cy + y_offset);

  1019.                     vdst = p->data[2] + p->linesize[2] * (cy + y_offset);

  1020. 

  1021.                     decode_422_bitstream(s, width);

  1022.                     lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],

  1023.                                                        width, lefty);

  1024.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1025.                         leftu = s->llviddsp.add_left_pred(udst, s->temp[1], width2, leftu);

  1026.                         leftv = s->llviddsp.add_left_pred(vdst, s->temp[2], width2, leftv);

  1027.                     }

  1028.                     if (s->predictor == PLANE) {

  1029.                         if (cy > s->interlaced) {

  1030.                             s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);

  1031.                             if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1032.                                 s->llviddsp.add_bytes(udst, udst - fake_ustride, width2);

  1033.                                 s->llviddsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1034.                             }

  1035.                         }

  1036.                     }

  1037.                 }

  1038.                 draw_slice(s, p, height);

  1039. 

  1040.                 break;

  1041.             case MEDIAN:

  1042.                 /* first line except first 2 pixels is left predicted */

  1043.                 decode_422_bitstream(s, width - 2);

  1044.                 lefty = s->llviddsp.add_left_pred(p->data[0] + 2, s->temp[0],

  1045.                                                    width - 2, lefty);

  1046.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1047.                     leftu = s->llviddsp.add_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1048.                     leftv = s->llviddsp.add_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1049.                 }

  1050. 

  1051.                 cy = y = 1;

  1052.                 if (y >= height)

  1053.                     break;

  1054. 

  1055.                 /* second line is left predicted for interlaced case */

  1056.                 if (s->interlaced) {

  1057.                     decode_422_bitstream(s, width);

  1058.                     lefty = s->llviddsp.add_left_pred(p->data[0] + p->linesize[0],

  1059.                                                        s->temp[0], width, lefty);

  1060.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1061.                         leftu = s->llviddsp.add_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1062.                         leftv = s->llviddsp.add_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1063.                     }

  1064.                     y++;

  1065.                     cy++;

  1066.                     if (y >= height)

  1067.                         break;

  1068.                 }

  1069. 

  1070.                 /* next 4 pixels are left predicted too */

  1071.                 decode_422_bitstream(s, 4);

  1072.                 lefty = s->llviddsp.add_left_pred(p->data[0] + fake_ystride,

  1073.                                                    s->temp[0], 4, lefty);

  1074.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1075.                     leftu = s->llviddsp.add_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1076.                     leftv = s->llviddsp.add_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1077.                 }

  1078. 

  1079.                 /* next line except the first 4 pixels is median predicted */

  1080.                 lefttopy = p->data[0][3];

  1081.                 decode_422_bitstream(s, width - 4);

  1082.                 s->llviddsp.add_median_pred(p->data[0] + fake_ystride + 4,

  1083.                                              p->data[0] + 4, s->temp[0],

  1084.                                              width - 4, &lefty, &lefttopy);

  1085.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1086.                     lefttopu = p->data[1][1];

  1087.                     lefttopv = p->data[2][1];

  1088.                     s->llviddsp.add_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  1089.                     s->llviddsp.add_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  1090.                 }

  1091.                 y++;

  1092.                 cy++;

  1093. 

  1094.                 for (; y < height; y++, cy++) {

  1095.                     uint8_t *ydst, *udst, *vdst;

  1096. 

  1097.                     if (s->bitstream_bpp == 12) {

  1098.                         while (2 * cy > y) {

  1099.                             decode_gray_bitstream(s, width);

  1100.                             ydst = p->data[0] + p->linesize[0] * y;

  1101.                             s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,

  1102.                                                          s->temp[0], width,

  1103.                                                          &lefty, &lefttopy);

  1104.                             y++;

  1105.                         }

  1106.                         if (y >= height)

  1107.                             break;

  1108.                     }

  1109.                     draw_slice(s, p, y);

  1110. 

  1111.                     decode_422_bitstream(s, width);

  1112. 

  1113.                     ydst = p->data[0] + p->linesize[0] * y;

  1114.                     udst = p->data[1] + p->linesize[1] * cy;

  1115.                     vdst = p->data[2] + p->linesize[2] * cy;

  1116. 

  1117.                     s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,

  1118.                                                  s->temp[0], width,

  1119.                                                  &lefty, &lefttopy);

  1120.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1121.                         s->llviddsp.add_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1122.                         s->llviddsp.add_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1123.                     }

  1124.                 }

  1125. 

  1126.                 draw_slice(s, p, height);

  1127.                 break;

  1128.             }

  1129.         }

  1130.     } else {

  1131.         int y;

  1132.         uint8_t left[4];

  1133.         const int last_line = (y_offset + height - 1) * p->linesize[0];

  1134. 

  1135.         if (s->bitstream_bpp == 32) {

  1136.             left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);

  1137.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1138.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1139.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1140.         } else {

  1141.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1142.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1143.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1144.             left[A] = p->data[0][last_line + A] = 255;

  1145.             skip_bits(&s->gb, 8);

  1146.         }

  1147. 

  1148.         if (s->bgr32) {

  1149.             switch (s->predictor) {

  1150.             case LEFT:

  1151.             case PLANE:

  1152.                 decode_bgr_bitstream(s, width - 1);

  1153.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,

  1154.                                                  s->temp[0], width - 1, left);

  1155. 

  1156.                 for (y = height - 2; y >= 0; y--) { // Yes it is stored upside down.

  1157.                     decode_bgr_bitstream(s, width);

  1158. 

  1159.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * (y + y_offset),

  1160.                                                      s->temp[0], width, left);

  1161.                     if (s->predictor == PLANE) {

  1162.                         if (s->bitstream_bpp != 32)

  1163.                             left[A] = 0;

  1164.                         if (y < height - 1 - s->interlaced) {

  1165.                             s->llviddsp.add_bytes(p->data[0] + p->linesize[0] * (y + y_offset),

  1166.                                               p->data[0] + p->linesize[0] * (y + y_offset) +

  1167.                                               fake_ystride, 4 * width);

  1168.                         }

  1169.                     }

  1170.                 }

  1171.                 // just 1 large slice as this is not possible in reverse order

  1172.                 draw_slice(s, p, height);

  1173.                 break;

  1174.             default:

  1175.                 av_log(avctx, AV_LOG_ERROR,

  1176.                        "prediction type not supported!\n");

  1177.             }

  1178.         } else {

  1179.             av_log(avctx, AV_LOG_ERROR,

  1180.                    "BGR24 output is not implemented yet\n");

  1181.             return AVERROR_PATCHWELCOME;

  1182.         }

  1183.     }

  1184. 

  1185.     return 0;

  1186. }

  1187. 

  1188. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  1189.                         AVPacket *avpkt)

  1190. {

  1191.     const uint8_t *buf = avpkt->data;

  1192.     int buf_size       = avpkt->size;

  1193.     HYuvContext *s = avctx->priv_data;

  1194.     const int width  = s->width;

  1195.     const int height = s->height;

  1196.     ThreadFrame frame = { .f = data };

  1197.     AVFrame *const p = data;

  1198.     int slice, table_size = 0, ret, nb_slices;

  1199.     unsigned slices_info_offset;

  1200.     int slice_height;

  1201. 

  1202.     if (buf_size < (width * height + 7)/8)

  1203.         return AVERROR_INVALIDDATA;

  1204. 

  1205.     av_fast_padded_malloc(&s->bitstream_buffer,

  1206.                    &s->bitstream_buffer_size,

  1207.                    buf_size);

  1208.     if (!s->bitstream_buffer)

  1209.         return AVERROR(ENOMEM);

  1210. 

  1211.     s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,

  1212.                       (const uint32_t *) buf, buf_size / 4);

  1213. 

  1214.     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)

  1215.         return ret;

  1216. 

  1217.     if (s->context) {

  1218.         table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);

  1219.         if (table_size < 0)

  1220.             return table_size;

  1221.     }

  1222. 

  1223.     if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)

  1224.         return AVERROR_INVALIDDATA;

  1225. 

  1226.     s->last_slice_end = 0;

  1227. 

  1228.     if (avctx->codec_id == AV_CODEC_ID_HYMT &&

  1229.         (buf_size > 32 && AV_RL32(avpkt->data + buf_size - 16) == 0)) {

  1230.         slices_info_offset = AV_RL32(avpkt->data + buf_size - 4);

  1231.         slice_height = AV_RL32(avpkt->data + buf_size - 8);

  1232.         nb_slices = AV_RL32(avpkt->data + buf_size - 12);

  1233.         if (nb_slices * 8LL + slices_info_offset > buf_size - 16 ||

  1234.             s->chroma_v_shift ||

  1235.             slice_height <= 0 || nb_slices * (uint64_t)slice_height > height)

  1236.             return AVERROR_INVALIDDATA;

  1237.     } else {

  1238.         slice_height = height;

  1239.         nb_slices = 1;

  1240.     }

  1241. 

  1242.     for (slice = 0; slice < nb_slices; slice++) {

  1243.         int y_offset, slice_offset, slice_size;

  1244. 

  1245.         if (nb_slices > 1) {

  1246.             slice_offset = AV_RL32(avpkt->data + slices_info_offset + slice * 8);

  1247.             slice_size = AV_RL32(avpkt->data + slices_info_offset + slice * 8 + 4);

  1248. 

  1249.             if (slice_offset < 0 || slice_size <= 0 || (slice_offset&3) ||

  1250.                 slice_offset + (int64_t)slice_size > buf_size)

  1251.                 return AVERROR_INVALIDDATA;

  1252. 

  1253.             y_offset = height - (slice + 1) * slice_height;

  1254.             s->bdsp.bswap_buf((uint32_t *)s->bitstream_buffer,

  1255.                               (const uint32_t *)(buf + slice_offset), slice_size / 4);

  1256.         } else {

  1257.             y_offset = 0;

  1258.             slice_offset = 0;

  1259.             slice_size = buf_size;

  1260.         }

  1261. 

  1262.         ret = decode_slice(avctx, p, slice_height, slice_size, y_offset, table_size);

  1263.         emms_c();

  1264.         if (ret < 0)

  1265.             return ret;

  1266.     }

  1267. 

  1268.     *got_frame = 1;

  1269. 

  1270.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  1271. }

  1272. 

  1273. AVCodec ff_huffyuv_decoder = {

  1274.     .name             = "huffyuv",

  1275.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1276.     .type             = AVMEDIA_TYPE_VIDEO,

  1277.     .id               = AV_CODEC_ID_HUFFYUV,

  1278.     .priv_data_size   = sizeof(HYuvContext),

  1279.     .init             = decode_init,

  1280.     .close            = decode_end,

  1281.     .decode           = decode_frame,

  1282.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1283.                         AV_CODEC_CAP_FRAME_THREADS,

  1284. };

  1285. 

  1286. #if CONFIG_FFVHUFF_DECODER

  1287. AVCodec ff_ffvhuff_decoder = {

  1288.     .name             = "ffvhuff",

  1289.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1290.     .type             = AVMEDIA_TYPE_VIDEO,

  1291.     .id               = AV_CODEC_ID_FFVHUFF,

  1292.     .priv_data_size   = sizeof(HYuvContext),

  1293.     .init             = decode_init,

  1294.     .close            = decode_end,

  1295.     .decode           = decode_frame,

  1296.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1297.                         AV_CODEC_CAP_FRAME_THREADS,

  1298. };

  1299. #endif /* CONFIG_FFVHUFF_DECODER */

  1300. 

  1301. #if CONFIG_HYMT_DECODER

  1302. AVCodec ff_hymt_decoder = {

  1303.     .name             = "hymt",

  1304.     .long_name        = NULL_IF_CONFIG_SMALL("HuffYUV MT"),

  1305.     .type             = AVMEDIA_TYPE_VIDEO,

  1306.     .id               = AV_CODEC_ID_HYMT,

  1307.     .priv_data_size   = sizeof(HYuvContext),

  1308.     .init             = decode_init,

  1309.     .close            = decode_end,

  1310.     .decode           = decode_frame,

  1311.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1312.                         AV_CODEC_CAP_FRAME_THREADS,

  1313. };

  1314. #endif /* CONFIG_HYMT_DECODER */