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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 0x170:

  422.             avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  423.             break;

  424.         case 0x470:

  425.             avctx->pix_fmt = AV_PIX_FMT_GBRP;

  426.             break;

  427.         case 0x480:

  428.             avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  429.             break;

  430.         case 0x490:

  431.             avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  432.             break;

  433.         case 0x4B0:

  434.             avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  435.             break;

  436.         case 0x4D0:

  437.             avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  438.             break;

  439.         case 0x4F0:

  440.             avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  441.             break;

  442.         case 0x570:

  443.             avctx->pix_fmt = AV_PIX_FMT_GBRAP;

  444.             break;

  445.         case 0x670:

  446.             avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  447.             break;

  448.         case 0x680:

  449.             avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  450.             break;

  451.         case 0x690:

  452.             avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  453.             break;

  454.         case 0x6B0:

  455.             avctx->pix_fmt = AV_PIX_FMT_YUV444P12;

  456.             break;

  457.         case 0x6D0:

  458.             avctx->pix_fmt = AV_PIX_FMT_YUV444P14;

  459.             break;

  460.         case 0x6F0:

  461.             avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  462.             break;

  463.         case 0x671:

  464.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  465.             break;

  466.         case 0x681:

  467.             avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  468.             break;

  469.         case 0x691:

  470.             avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  471.             break;

  472.         case 0x6B1:

  473.             avctx->pix_fmt = AV_PIX_FMT_YUV422P12;

  474.             break;

  475.         case 0x6D1:

  476.             avctx->pix_fmt = AV_PIX_FMT_YUV422P14;

  477.             break;

  478.         case 0x6F1:

  479.             avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  480.             break;

  481.         case 0x672:

  482.             avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  483.             break;

  484.         case 0x674:

  485.             avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  486.             break;

  487.         case 0x675:

  488.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  489.             break;

  490.         case 0x685:

  491.             avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  492.             break;

  493.         case 0x695:

  494.             avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  495.             break;

  496.         case 0x6B5:

  497.             avctx->pix_fmt = AV_PIX_FMT_YUV420P12;

  498.             break;

  499.         case 0x6D5:

  500.             avctx->pix_fmt = AV_PIX_FMT_YUV420P14;

  501.             break;

  502.         case 0x6F5:

  503.             avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  504.             break;

  505.         case 0x67A:

  506.             avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  507.             break;

  508.         case 0x770:

  509.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  510.             break;

  511.         case 0x780:

  512.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;

  513.             break;

  514.         case 0x790:

  515.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;

  516.             break;

  517.         case 0x7F0:

  518.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  519.             break;

  520.         case 0x771:

  521.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  522.             break;

  523.         case 0x781:

  524.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;

  525.             break;

  526.         case 0x791:

  527.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;

  528.             break;

  529.         case 0x7F1:

  530.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  531.             break;

  532.         case 0x775:

  533.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  534.             break;

  535.         case 0x785:

  536.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;

  537.             break;

  538.         case 0x795:

  539.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;

  540.             break;

  541.         case 0x7F5:

  542.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;

  543.             break;

  544.         default:

  545.             ret = AVERROR_INVALIDDATA;

  546.             goto error;

  547.         }

  548.     }

  549. 

  550.     ff_huffyuv_common_init(avctx);

  551. 

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

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

  554.         ret = AVERROR_INVALIDDATA;

  555.         goto error;

  556.     }

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

  558.         avctx->width % 4) {

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

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

  561.         ret = AVERROR_INVALIDDATA;

  562.         goto error;

  563.     }

  564. 

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

  566.         ff_huffyuv_common_end(s);

  567.         goto error;

  568.     }

  569. 

  570.     return 0;

  571.   error:

  572.     decode_end(avctx);

  573.     return ret;

  574. }

  575. 

  576. #if HAVE_THREADS

  577. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  578. {

  579.     HYuvContext *s = avctx->priv_data;

  580.     int i, ret;

  581. 

  582.     s->avctx = avctx;

  583. 

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

  585.         ff_huffyuv_common_end(s);

  586.         return ret;

  587.     }

  588. 

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

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

  591. 

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

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

  594.                                        avctx->extradata_size)) < 0)

  595.             return ret;

  596.     } else {

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

  598.             return ret;

  599.     }

  600. 

  601.     return 0;

  602. }

  603. #endif

  604. 

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

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

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

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

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

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

  611.         UPDATE_CACHE(name, gb);                             \

  612.                                                             \

  613.         nb_bits = -n;                                       \

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

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

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

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

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

  619.             UPDATE_CACHE(name, gb);                         \

  620.                                                             \

  621.             nb_bits = -n;                                   \

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

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

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

  625.         }                                                   \

  626.     }                                                       \

  627.     dst = code;                                             \

  628.     LAST_SKIP_BITS(name, gb, n)

  629. 

  630. 

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

  632.                      bits, max_depth, OP)                           \

  633.     do {                                                            \

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

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

  636.                                                                     \

  637.         if (n<=0) {                                                 \

  638.             int nb_bits;                                            \

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

  640.                                                                     \

  641.             UPDATE_CACHE(re, gb);                                   \

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

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

  644.         } else {                                                    \

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

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

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

  648.         }                                                           \

  649.     } while (0)

  650. 

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

  652. 

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

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

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

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

  657. 

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

  659. {

  660.     int i, icount;

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

  662.     count /= 2;

  663. 

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

  665.     if (count >= icount) {

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

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

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

  669.         }

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

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

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

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

  674.         }

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

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

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

  678.     } else {

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

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

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

  682.         }

  683.     }

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

  685. }

  686. 

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

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

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

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

  691. 

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

  693. 

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

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

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

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

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

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

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

  701. }

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

  703. {

  704.     int i, count = width/2;

  705. 

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

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

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

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

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

  711.             }

  712.         } else {

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

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

  715.             }

  716.         }

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

  718.             unsigned int index;

  719.             int nb_bits, code, n;

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

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

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

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

  724.         }

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

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

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

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

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

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

  731.             }

  732.         } else {

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

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

  735.             }

  736.         }

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

  738.             unsigned int index;

  739.             int nb_bits, code, n;

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

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

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

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

  744.         }

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

  746.     } else {

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

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

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

  750.             }

  751.         } else {

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

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

  754.             }

  755.         }

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

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

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

  759.         }

  760.     }

  761. }

  762. 

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

  764. {

  765.     int i;

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

  767.     count /= 2;

  768. 

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

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

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

  772.         }

  773.     } else {

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

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

  776.         }

  777.     }

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

  779. }

  780. 

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

  782.                                           int decorrelate, int alpha)

  783. {

  784.     int i;

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

  786. 

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

  788.         unsigned int index;

  789.         int code, n, nb_bits;

  790. 

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

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

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

  794. 

  795.         if (n>0) {

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

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

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

  799.         } else {

  800.             if (decorrelate) {

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

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

  803. 

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

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

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

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

  808. 

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

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

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

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

  813.             } else {

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

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

  816. 

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

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

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

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

  821. 

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

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

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

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

  826.             }

  827.         }

  828.         if (alpha) {

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

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

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

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

  833.         } else

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

  835.     }

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

  837. }

  838. 

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

  840. {

  841.     if (s->decorrelate) {

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

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

  844.         else

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

  846.     } else {

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

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

  849.         else

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

  851.     }

  852. }

  853. 

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

  855. {

  856.     int h, cy, i;

  857.     int offset[AV_NUM_DATA_POINTERS];

  858. 

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

  860.         return;

  861. 

  862.     h  = y - s->last_slice_end;

  863.     y -= h;

  864. 

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

  866.         cy = y >> 1;

  867.     else

  868.         cy = y;

  869. 

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

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

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

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

  874.         offset[i] = 0;

  875.     emms_c();

  876. 

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

  878. 

  879.     s->last_slice_end = y + h;

  880. }

  881. 

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

  883. {

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

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

  886.     } else {

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

  888.     }

  889. }

  890. 

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

  892. {

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

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

  895.     } else {

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

  897.     }

  898. }

  899. 

  900. 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)

  901. {

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

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

  904.     } else {

  905.         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);

  906.     }

  907. }

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

  909.                         AVPacket *avpkt)

  910. {

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

  912.     int buf_size       = avpkt->size;

  913.     HYuvContext *s = avctx->priv_data;

  914.     const int width  = s->width;

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

  916.     const int height = s->height;

  917.     int fake_ystride, fake_ustride, fake_vstride;

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

  919.     AVFrame *const p = data;

  920.     int table_size = 0, ret;

  921. 

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

  923.         return AVERROR_INVALIDDATA;

  924. 

  925.     av_fast_padded_malloc(&s->bitstream_buffer,

  926.                    &s->bitstream_buffer_size,

  927.                    buf_size);

  928.     if (!s->bitstream_buffer)

  929.         return AVERROR(ENOMEM);

  930. 

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

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

  933. 

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

  935.         return ret;

  936. 

  937.     if (s->context) {

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

  939.         if (table_size < 0)

  940.             return table_size;

  941.     }

  942. 

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

  944.         return AVERROR_INVALIDDATA;

  945. 

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

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

  948.         return ret;

  949. 

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

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

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

  953. 

  954.     s->last_slice_end = 0;

  955. 

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

  957.         int plane;

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

  959.             int left, lefttop, y;

  960.             int w = width;

  961.             int h = height;

  962.             int fake_stride = fake_ystride;

  963. 

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

  965.                 w >>= s->chroma_h_shift;

  966.                 h >>= s->chroma_v_shift;

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

  968.             }

  969. 

  970.             switch (s->predictor) {

  971.             case LEFT:

  972.             case PLANE:

  973.                 decode_plane_bitstream(s, w, plane);

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

  975. 

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

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

  978. 

  979.                     decode_plane_bitstream(s, w, plane);

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

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

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

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

  984.                         }

  985.                     }

  986.                 }

  987. 

  988.                 break;

  989.             case MEDIAN:

  990.                 decode_plane_bitstream(s, w, plane);

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

  992. 

  993.                 y = 1;

  994. 

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

  996.                 if (s->interlaced) {

  997.                     decode_plane_bitstream(s, w, plane);

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

  999.                     y++;

  1000.                 }

  1001. 

  1002.                 lefttop = p->data[plane][0];

  1003.                 decode_plane_bitstream(s, w, plane);

  1004.                 add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);

  1005.                 y++;

  1006. 

  1007.                 for (; y<h; y++) {

  1008.                     uint8_t *dst;

  1009. 

  1010.                     decode_plane_bitstream(s, w, plane);

  1011. 

  1012.                     dst = p->data[plane] + p->linesize[plane] * y;

  1013. 

  1014.                     add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);

  1015.                 }

  1016. 

  1017.                 break;

  1018.             }

  1019.         }

  1020.         draw_slice(s, p, height);

  1021.     } else if (s->bitstream_bpp < 24) {

  1022.         int y, cy;

  1023.         int lefty, leftu, leftv;

  1024.         int lefttopy, lefttopu, lefttopv;

  1025. 

  1026.         if (s->yuy2) {

  1027.             p->data[0][3] = get_bits(&s->gb, 8);

  1028.             p->data[0][2] = get_bits(&s->gb, 8);

  1029.             p->data[0][1] = get_bits(&s->gb, 8);

  1030.             p->data[0][0] = get_bits(&s->gb, 8);

  1031. 

  1032.             av_log(avctx, AV_LOG_ERROR,

  1033.                    "YUY2 output is not implemented yet\n");

  1034.             return AVERROR_PATCHWELCOME;

  1035.         } else {

  1036.             leftv         =

  1037.             p->data[2][0] = get_bits(&s->gb, 8);

  1038.             lefty         =

  1039.             p->data[0][1] = get_bits(&s->gb, 8);

  1040.             leftu         =

  1041.             p->data[1][0] = get_bits(&s->gb, 8);

  1042.             p->data[0][0] = get_bits(&s->gb, 8);

  1043. 

  1044.             switch (s->predictor) {

  1045.             case LEFT:

  1046.             case PLANE:

  1047.                 decode_422_bitstream(s, width - 2);

  1048.                 lefty = s->llviddsp.add_left_pred(p->data[0] + 2, s->temp[0],

  1049.                                                    width - 2, lefty);

  1050.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1051.                     leftu = s->llviddsp.add_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1052.                     leftv = s->llviddsp.add_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1053.                 }

  1054. 

  1055.                 for (cy = y = 1; y < s->height; y++, cy++) {

  1056.                     uint8_t *ydst, *udst, *vdst;

  1057. 

  1058.                     if (s->bitstream_bpp == 12) {

  1059.                         decode_gray_bitstream(s, width);

  1060. 

  1061.                         ydst = p->data[0] + p->linesize[0] * y;

  1062. 

  1063.                         lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],

  1064.                                                            width, lefty);

  1065.                         if (s->predictor == PLANE) {

  1066.                             if (y > s->interlaced)

  1067.                                 s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);

  1068.                         }

  1069.                         y++;

  1070.                         if (y >= s->height)

  1071.                             break;

  1072.                     }

  1073. 

  1074.                     draw_slice(s, p, y);

  1075. 

  1076.                     ydst = p->data[0] + p->linesize[0] * y;

  1077.                     udst = p->data[1] + p->linesize[1] * cy;

  1078.                     vdst = p->data[2] + p->linesize[2] * cy;

  1079. 

  1080.                     decode_422_bitstream(s, width);

  1081.                     lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],

  1082.                                                        width, lefty);

  1083.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1084.                         leftu = s->llviddsp.add_left_pred(udst, s->temp[1], width2, leftu);

  1085.                         leftv = s->llviddsp.add_left_pred(vdst, s->temp[2], width2, leftv);

  1086.                     }

  1087.                     if (s->predictor == PLANE) {

  1088.                         if (cy > s->interlaced) {

  1089.                             s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);

  1090.                             if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1091.                                 s->llviddsp.add_bytes(udst, udst - fake_ustride, width2);

  1092.                                 s->llviddsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1093.                             }

  1094.                         }

  1095.                     }

  1096.                 }

  1097.                 draw_slice(s, p, height);

  1098. 

  1099.                 break;

  1100.             case MEDIAN:

  1101.                 /* first line except first 2 pixels is left predicted */

  1102.                 decode_422_bitstream(s, width - 2);

  1103.                 lefty = s->llviddsp.add_left_pred(p->data[0] + 2, s->temp[0],

  1104.                                                    width - 2, lefty);

  1105.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1106.                     leftu = s->llviddsp.add_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1107.                     leftv = s->llviddsp.add_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1108.                 }

  1109. 

  1110.                 cy = y = 1;

  1111. 

  1112.                 /* second line is left predicted for interlaced case */

  1113.                 if (s->interlaced) {

  1114.                     decode_422_bitstream(s, width);

  1115.                     lefty = s->llviddsp.add_left_pred(p->data[0] + p->linesize[0],

  1116.                                                        s->temp[0], width, lefty);

  1117.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1118.                         leftu = s->llviddsp.add_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1119.                         leftv = s->llviddsp.add_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1120.                     }

  1121.                     y++;

  1122.                     cy++;

  1123.                 }

  1124. 

  1125.                 /* next 4 pixels are left predicted too */

  1126.                 decode_422_bitstream(s, 4);

  1127.                 lefty = s->llviddsp.add_left_pred(p->data[0] + fake_ystride,

  1128.                                                    s->temp[0], 4, lefty);

  1129.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1130.                     leftu = s->llviddsp.add_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1131.                     leftv = s->llviddsp.add_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1132.                 }

  1133. 

  1134.                 /* next line except the first 4 pixels is median predicted */

  1135.                 lefttopy = p->data[0][3];

  1136.                 decode_422_bitstream(s, width - 4);

  1137.                 s->llviddsp.add_median_pred(p->data[0] + fake_ystride + 4,

  1138.                                              p->data[0] + 4, s->temp[0],

  1139.                                              width - 4, &lefty, &lefttopy);

  1140.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1141.                     lefttopu = p->data[1][1];

  1142.                     lefttopv = p->data[2][1];

  1143.                     s->llviddsp.add_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  1144.                     s->llviddsp.add_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  1145.                 }

  1146.                 y++;

  1147.                 cy++;

  1148. 

  1149.                 for (; y < height; y++, cy++) {

  1150.                     uint8_t *ydst, *udst, *vdst;

  1151. 

  1152.                     if (s->bitstream_bpp == 12) {

  1153.                         while (2 * cy > y) {

  1154.                             decode_gray_bitstream(s, width);

  1155.                             ydst = p->data[0] + p->linesize[0] * y;

  1156.                             s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,

  1157.                                                          s->temp[0], width,

  1158.                                                          &lefty, &lefttopy);

  1159.                             y++;

  1160.                         }

  1161.                         if (y >= height)

  1162.                             break;

  1163.                     }

  1164.                     draw_slice(s, p, y);

  1165. 

  1166.                     decode_422_bitstream(s, width);

  1167. 

  1168.                     ydst = p->data[0] + p->linesize[0] * y;

  1169.                     udst = p->data[1] + p->linesize[1] * cy;

  1170.                     vdst = p->data[2] + p->linesize[2] * cy;

  1171. 

  1172.                     s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,

  1173.                                                  s->temp[0], width,

  1174.                                                  &lefty, &lefttopy);

  1175.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1176.                         s->llviddsp.add_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1177.                         s->llviddsp.add_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1178.                     }

  1179.                 }

  1180. 

  1181.                 draw_slice(s, p, height);

  1182.                 break;

  1183.             }

  1184.         }

  1185.     } else {

  1186.         int y;

  1187.         uint8_t left[4];

  1188.         const int last_line = (height - 1) * p->linesize[0];

  1189. 

  1190.         if (s->bitstream_bpp == 32) {

  1191.             left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);

  1192.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1193.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1194.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1195.         } else {

  1196.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1197.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1198.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1199.             left[A] = p->data[0][last_line + A] = 255;

  1200.             skip_bits(&s->gb, 8);

  1201.         }

  1202. 

  1203.         if (s->bgr32) {

  1204.             switch (s->predictor) {

  1205.             case LEFT:

  1206.             case PLANE:

  1207.                 decode_bgr_bitstream(s, width - 1);

  1208.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,

  1209.                                                  s->temp[0], width - 1, left);

  1210. 

  1211.                 for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.

  1212.                     decode_bgr_bitstream(s, width);

  1213. 

  1214.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,

  1215.                                                      s->temp[0], width, left);

  1216.                     if (s->predictor == PLANE) {

  1217.                         if (s->bitstream_bpp != 32)

  1218.                             left[A] = 0;

  1219.                         if (y < s->height - 1 - s->interlaced) {

  1220.                             s->llviddsp.add_bytes(p->data[0] + p->linesize[0] * y,

  1221.                                               p->data[0] + p->linesize[0] * y +

  1222.                                               fake_ystride, 4 * width);

  1223.                         }

  1224.                     }

  1225.                 }

  1226.                 // just 1 large slice as this is not possible in reverse order

  1227.                 draw_slice(s, p, height);

  1228.                 break;

  1229.             default:

  1230.                 av_log(avctx, AV_LOG_ERROR,

  1231.                        "prediction type not supported!\n");

  1232.             }

  1233.         } else {

  1234.             av_log(avctx, AV_LOG_ERROR,

  1235.                    "BGR24 output is not implemented yet\n");

  1236.             return AVERROR_PATCHWELCOME;

  1237.         }

  1238.     }

  1239.     emms_c();

  1240. 

  1241.     *got_frame = 1;

  1242. 

  1243.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  1244. }

  1245. 

  1246. AVCodec ff_huffyuv_decoder = {

  1247.     .name             = "huffyuv",

  1248.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1249.     .type             = AVMEDIA_TYPE_VIDEO,

  1250.     .id               = AV_CODEC_ID_HUFFYUV,

  1251.     .priv_data_size   = sizeof(HYuvContext),

  1252.     .init             = decode_init,

  1253.     .close            = decode_end,

  1254.     .decode           = decode_frame,

  1255.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1256.                         AV_CODEC_CAP_FRAME_THREADS,

  1257.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1258. };

  1259. 

  1260. #if CONFIG_FFVHUFF_DECODER

  1261. AVCodec ff_ffvhuff_decoder = {

  1262.     .name             = "ffvhuff",

  1263.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1264.     .type             = AVMEDIA_TYPE_VIDEO,

  1265.     .id               = AV_CODEC_ID_FFVHUFF,

  1266.     .priv_data_size   = sizeof(HYuvContext),

  1267.     .init             = decode_init,

  1268.     .close            = decode_end,

  1269.     .decode           = decode_frame,

  1270.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1271.                         AV_CODEC_CAP_FRAME_THREADS,

  1272.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1273. };

  1274. #endif /* CONFIG_FFVHUFF_DECODER */