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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 "thread.h"

  40. #include "libavutil/pixdesc.h"

  41. 

  42. #define classic_shift_luma_table_size 42

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

  44.     34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,

  45.     14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,

  46.     10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0,

  47.   0,0,0,0,0,0,0,0,

  48. };

  49. 

  50. #define classic_shift_chroma_table_size 59

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

  52.     66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,

  53.     84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,

  54.     57, 56,  58,  57, 58, 57, 184, 119, 214, 245, 116,  83,  82, 49, 80,  79,

  55.     78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0,

  56.   0,0,0,0,0,0,0,0,

  57. };

  58. 

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

  60.      3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

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

  62.     68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  63.     35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  64.     37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  65.     35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  66.     27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  67.     15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  68.     12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  69.     12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  70.     18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  71.     28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  72.     28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  73.     62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  74.     54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  75.     46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  76. };

  77. 

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

  79.      3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,

  80.      7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,

  81.      11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,

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

  83.     143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,

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

  85.      17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,

  86.     112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,

  87.       0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,

  88.     135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,

  89.      52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,

  90.      19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,

  91.       7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,

  92.      83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,

  93.      14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,

  94.       6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,

  95. };

  96. 

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

  98. {

  99.     int i, val, repeat;

  100. 

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

  102.         repeat = get_bits(gb, 3);

  103.         val    = get_bits(gb, 5);

  104.         if (repeat == 0)

  105.             repeat = get_bits(gb, 8);

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

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

  108.             return -1;

  109.         }

  110.         while (repeat--)

  111.             dst[i++] = val;

  112.     }

  113.     return 0;

  114. }

  115. 

  116. static int generate_joint_tables(HYuvContext *s)

  117. {

  118.     uint16_t symbols[1 << VLC_BITS];

  119.     uint16_t bits[1 << VLC_BITS];

  120.     uint8_t len[1 << VLC_BITS];

  121.     int ret;

  122. 

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

  124.         int p, i, y, u;

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

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

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

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

  129.                 int limit = VLC_BITS - len0;

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

  131.                     continue;

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

  133.                     continue;

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

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

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

  137.                         continue;

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

  139.                         continue;

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

  141.                     len[i]     = len0 + len1;

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

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

  144.                         i++;

  145.                 }

  146.             }

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

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

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

  150.                 return ret;

  151.         }

  152.     } else {

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

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

  155.         int p0 = s->decorrelate;

  156.         int p1 = !s->decorrelate;

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

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

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

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

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

  162.             int limit0 = VLC_BITS - len0;

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

  164.                 continue;

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

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

  167.                 int limit1 = limit0 - len1;

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

  169.                     continue;

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

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

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

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

  174.                         continue;

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

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

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

  178.                     if (s->decorrelate) {

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

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

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

  182.                     } else {

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

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

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

  186.                     }

  187.                     i++;

  188.                 }

  189.             }

  190.         }

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

  192.         if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0)) < 0)

  193.             return ret;

  194.     }

  195.     return 0;

  196. }

  197. 

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

  199. {

  200.     GetBitContext gb;

  201.     int i;

  202.     int ret;

  203.     int count = 3;

  204. 

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

  206. 

  207.     if (s->version > 2)

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

  209. 

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

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

  212.             return -1;

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

  214.             return -1;

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

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

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

  218.             return ret;

  219.     }

  220. 

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

  222.         return ret;

  223. 

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

  225. }

  226. 

  227. static int read_old_huffman_tables(HYuvContext *s)

  228. {

  229.     GetBitContext gb;

  230.     int i;

  231.     int ret;

  232. 

  233.     init_get_bits(&gb, classic_shift_luma,

  234.                   classic_shift_luma_table_size * 8);

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

  236.         return -1;

  237. 

  238.     init_get_bits(&gb, classic_shift_chroma,

  239.                   classic_shift_chroma_table_size * 8);

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

  241.         return -1;

  242. 

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

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

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

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

  247. 

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

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

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

  251.     }

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

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

  254. 

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

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

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

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

  259.             return ret;

  260.     }

  261. 

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

  263.         return ret;

  264. 

  265.     return 0;

  266. }

  267. 

  268. static av_cold int decode_init(AVCodecContext *avctx)

  269. {

  270.     HYuvContext *s = avctx->priv_data;

  271. 

  272.     ff_huffyuvdsp_init(&s->hdsp);

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

  274. 

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

  276.     s->bgr32      = 1;

  277. 

  278.     if (avctx->extradata_size) {

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

  280.             avctx->bits_per_coded_sample != 12)

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

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

  283.             s->version = 2;

  284.         else

  285.             s->version = 3;

  286.     } else

  287.         s->version = 0;

  288. 

  289.     s->bps = 8;

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

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

  292.     s->chroma = 1;

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

  294.         int method, interlace;

  295. 

  296.         if (avctx->extradata_size < 4)

  297.             return -1;

  298. 

  299.         method           = ((uint8_t *) avctx->extradata)[0];

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

  301.         s->predictor     = method & 63;

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

  303.             s->bitstream_bpp = ((uint8_t *) avctx->extradata)[1];

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

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

  306.         } else {

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

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

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

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

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

  312.             s->yuv   = !!(((uint8_t *) avctx->extradata)[2] & 1);

  313.             s->chroma= !!(((uint8_t *) avctx->extradata)[2] & 3);

  314.             s->alpha = !!(((uint8_t *) avctx->extradata)[2] & 4);

  315.         }

  316.         interlace     = (((uint8_t *) avctx->extradata)[2] & 0x30) >> 4;

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

  318.         s->context    = ((uint8_t *) avctx->extradata)[2] & 0x40 ? 1 : 0;

  319. 

  320.         if (read_huffman_tables(s, ((uint8_t *) avctx->extradata) + 4,

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

  322.             return AVERROR_INVALIDDATA;

  323.     } else {

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

  325.         case 1:

  326.             s->predictor   = LEFT;

  327.             s->decorrelate = 0;

  328.             break;

  329.         case 2:

  330.             s->predictor   = LEFT;

  331.             s->decorrelate = 1;

  332.             break;

  333.         case 3:

  334.             s->predictor   = PLANE;

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

  336.             break;

  337.         case 4:

  338.             s->predictor   = MEDIAN;

  339.             s->decorrelate = 0;

  340.             break;

  341.         default:

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

  343.             s->decorrelate = 0;

  344.             break;

  345.         }

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

  347.         s->context       = 0;

  348. 

  349.         if (read_old_huffman_tables(s) < 0)

  350.             return AVERROR_INVALIDDATA;

  351.     }

  352. 

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

  354.         switch (s->bitstream_bpp) {

  355.         case 12:

  356.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  357.             s->yuv = 1;

  358.             break;

  359.         case 16:

  360.             if (s->yuy2)

  361.                 avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  362.             else

  363.                 avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  364.             s->yuv = 1;

  365.             break;

  366.         case 24:

  367.             if (s->bgr32)

  368.                 avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  369.             else

  370.                 avctx->pix_fmt = AV_PIX_FMT_BGR24;

  371.             break;

  372.         case 32:

  373.             av_assert0(s->bgr32);

  374.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  375.             s->alpha = 1;

  376.             break;

  377.         default:

  378.             return AVERROR_INVALIDDATA;

  379.         }

  380.         av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,

  381.                                          &s->chroma_h_shift,

  382.                                          &s->chroma_v_shift);

  383.     } else {

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

  385.         case 0x070:

  386.             avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  387.             break;

  388.         case 0x0F0:

  389.             avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  390.             break;

  391.         case 0x170:

  392.             avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  393.             break;

  394.         case 0x470:

  395.             avctx->pix_fmt = AV_PIX_FMT_GBRP;

  396.             break;

  397.         case 0x480:

  398.             avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  399.             break;

  400.         case 0x490:

  401.             avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  402.             break;

  403.         case 0x4B0:

  404.             avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  405.             break;

  406.         case 0x4D0:

  407.             avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  408.             break;

  409.         case 0x4F0:

  410.             avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  411.             break;

  412.         case 0x570:

  413.             avctx->pix_fmt = AV_PIX_FMT_GBRAP;

  414.             break;

  415.         case 0x670:

  416.             avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  417.             break;

  418.         case 0x680:

  419.             avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  420.             break;

  421.         case 0x690:

  422.             avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  423.             break;

  424.         case 0x6B0:

  425.             avctx->pix_fmt = AV_PIX_FMT_YUV444P12;

  426.             break;

  427.         case 0x6D0:

  428.             avctx->pix_fmt = AV_PIX_FMT_YUV444P14;

  429.             break;

  430.         case 0x6F0:

  431.             avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  432.             break;

  433.         case 0x671:

  434.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  435.             break;

  436.         case 0x681:

  437.             avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  438.             break;

  439.         case 0x691:

  440.             avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  441.             break;

  442.         case 0x6B1:

  443.             avctx->pix_fmt = AV_PIX_FMT_YUV422P12;

  444.             break;

  445.         case 0x6D1:

  446.             avctx->pix_fmt = AV_PIX_FMT_YUV422P14;

  447.             break;

  448.         case 0x6F1:

  449.             avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  450.             break;

  451.         case 0x672:

  452.             avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  453.             break;

  454.         case 0x674:

  455.             avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  456.             break;

  457.         case 0x675:

  458.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  459.             break;

  460.         case 0x685:

  461.             avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  462.             break;

  463.         case 0x695:

  464.             avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  465.             break;

  466.         case 0x6B5:

  467.             avctx->pix_fmt = AV_PIX_FMT_YUV420P12;

  468.             break;

  469.         case 0x6D5:

  470.             avctx->pix_fmt = AV_PIX_FMT_YUV420P14;

  471.             break;

  472.         case 0x6F5:

  473.             avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  474.             break;

  475.         case 0x67A:

  476.             avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  477.             break;

  478.         case 0x770:

  479.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  480.             break;

  481.         case 0x780:

  482.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;

  483.             break;

  484.         case 0x790:

  485.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;

  486.             break;

  487.         case 0x7F0:

  488.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  489.             break;

  490.         case 0x771:

  491.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  492.             break;

  493.         case 0x781:

  494.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;

  495.             break;

  496.         case 0x791:

  497.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;

  498.             break;

  499.         case 0x7F1:

  500.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  501.             break;

  502.         case 0x775:

  503.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  504.             break;

  505.         case 0x785:

  506.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;

  507.             break;

  508.         case 0x795:

  509.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;

  510.             break;

  511.         case 0x7F5:

  512.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;

  513.             break;

  514.         default:

  515.             return AVERROR_INVALIDDATA;

  516.         }

  517.     }

  518. 

  519.     ff_huffyuv_common_init(avctx);

  520. 

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

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

  523.         return AVERROR_INVALIDDATA;

  524.     }

  525.     if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P && avctx->width%4) {

  526.         av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 this colorspace and predictor\n");

  527.         return AVERROR_INVALIDDATA;

  528.     }

  529.     if (ff_huffyuv_alloc_temp(s)) {

  530.         ff_huffyuv_common_end(s);

  531.         return AVERROR(ENOMEM);

  532.     }

  533. 

  534.     return 0;

  535. }

  536. 

  537. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  538. {

  539.     HYuvContext *s = avctx->priv_data;

  540.     int i;

  541. 

  542.     if (ff_huffyuv_alloc_temp(s)) {

  543.         ff_huffyuv_common_end(s);

  544.         return AVERROR(ENOMEM);

  545.     }

  546. 

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

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

  549. 

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

  551.         if (read_huffman_tables(s, ((uint8_t *) avctx->extradata) + 4,

  552.                                 avctx->extradata_size) < 0)

  553.             return AVERROR_INVALIDDATA;

  554.     } else {

  555.         if (read_old_huffman_tables(s) < 0)

  556.             return AVERROR_INVALIDDATA;

  557.     }

  558. 

  559.     return 0;

  560. }

  561. 

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

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

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

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

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

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

  568.         UPDATE_CACHE(name, gb);                             \

  569.                                                             \

  570.         nb_bits = -n;                                       \

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

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

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

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

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

  576.             UPDATE_CACHE(name, gb);                         \

  577.                                                             \

  578.             nb_bits = -n;                                   \

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

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

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

  582.         }                                                   \

  583.     }                                                       \

  584.     dst = code;                                             \

  585.     LAST_SKIP_BITS(name, gb, n)

  586. 

  587. 

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

  589.                      bits, max_depth, OP)                           \

  590.     do {                                                            \

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

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

  593.                                                                     \

  594.         if (n<=0) {                                                 \

  595.             int nb_bits;                                            \

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

  597.                                                                     \

  598.             UPDATE_CACHE(re, gb);                                   \

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

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

  601.         } else {                                                    \

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

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

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

  605.         }                                                           \

  606.     } while (0)

  607. 

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

  609. 

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

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

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

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

  614. 

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

  616. {

  617.     int i, icount;

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

  619.     count /= 2;

  620. 

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

  622.     if (count >= icount) {

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

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

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

  626.         }

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

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

  629.             if (get_bits_left(&s->gb) <= 0) break;

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

  631.         }

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

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

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

  635.     } else {

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

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

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

  639.         }

  640.     }

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

  642. }

  643. 

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

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

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

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

  648. 

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

  650. 

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

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

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

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

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

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

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

  658. }

  659. static void decode_plane_bitstream(HYuvContext *s, int count, int plane)

  660. {

  661.     int i;

  662. 

  663.     count /= 2;

  664. 

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

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

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

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

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

  670.             }

  671.         } else {

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

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

  674.             }

  675.         }

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

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

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

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

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

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

  682.             }

  683.         } else {

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

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

  686.             }

  687.         }

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

  689.     } else {

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

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

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

  693.             }

  694.         } else {

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

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

  697.             }

  698.         }

  699.     }

  700. }

  701. 

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

  703. {

  704.     int i;

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

  706.     count /= 2;

  707. 

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

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

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

  711.         }

  712.     } else {

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

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

  715.         }

  716.     }

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

  718. }

  719. 

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

  721.                                           int decorrelate, int alpha)

  722. {

  723.     int i;

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

  725. 

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

  727.         unsigned int index;

  728.         int code, n;

  729. 

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

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

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

  733. 

  734.         if (n>0) {

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

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

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

  738.         } else {

  739.             int nb_bits;

  740.             if (decorrelate) {

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

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

  743. 

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

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

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

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

  748. 

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

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

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

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

  753.             } else {

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

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

  756. 

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

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

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

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

  761. 

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

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

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

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

  766.             }

  767.             if (alpha) {

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

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

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

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

  772.             } else

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

  774.         }

  775.     }

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

  777. }

  778. 

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

  780. {

  781.     if (s->decorrelate) {

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

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

  784.         else

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

  786.     } else {

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

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

  789.         else

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

  791.     }

  792. }

  793. 

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

  795. {

  796.     int h, cy, i;

  797.     int offset[AV_NUM_DATA_POINTERS];

  798. 

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

  800.         return;

  801. 

  802.     h  = y - s->last_slice_end;

  803.     y -= h;

  804. 

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

  806.         cy = y >> 1;

  807.     else

  808.         cy = y;

  809. 

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

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

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

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

  814.         offset[i] = 0;

  815.     emms_c();

  816. 

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

  818. 

  819.     s->last_slice_end = y + h;

  820. }

  821. 

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

  823. {

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

  825.         return s->hdsp.add_hfyu_left_pred(dst, src, w, acc);

  826.     } else {

  827.         return s->llviddsp.add_hfyu_left_pred_int16((      uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);

  828.     }

  829. }

  830. 

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

  832. {

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

  834.         s->hdsp.add_bytes(dst, src, w);

  835.     } else {

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

  837.     }

  838. }

  839. 

  840. 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)

  841. {

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

  843.         s->hdsp.add_hfyu_median_pred(dst, src, diff, w, left, left_top);

  844.     } else {

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

  846.     }

  847. }

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

  849.                         AVPacket *avpkt)

  850. {

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

  852.     int buf_size       = avpkt->size;

  853.     HYuvContext *s = avctx->priv_data;

  854.     const int width  = s->width;

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

  856.     const int height = s->height;

  857.     int fake_ystride, fake_ustride, fake_vstride;

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

  859.     AVFrame *const p = data;

  860.     int table_size = 0, ret;

  861. 

  862.     av_fast_padded_malloc(&s->bitstream_buffer,

  863.                    &s->bitstream_buffer_size,

  864.                    buf_size);

  865.     if (!s->bitstream_buffer)

  866.         return AVERROR(ENOMEM);

  867. 

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

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

  870. 

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

  872.         return ret;

  873. 

  874.     if (s->context) {

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

  876.         if (table_size < 0)

  877.             return AVERROR_INVALIDDATA;

  878.     }

  879. 

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

  881.         return AVERROR_INVALIDDATA;

  882. 

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

  884.                   (buf_size - table_size) * 8);

  885. 

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

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

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

  889. 

  890.     s->last_slice_end = 0;

  891. 

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

  893.         int plane;

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

  895.             int left, lefttop, y;

  896.             int w = width;

  897.             int h = height;

  898.             int fake_stride = fake_ystride;

  899. 

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

  901.                 w >>= s->chroma_h_shift;

  902.                 h >>= s->chroma_v_shift;

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

  904.             }

  905. 

  906.             switch (s->predictor) {

  907.             case LEFT:

  908.             case PLANE:

  909.                 decode_plane_bitstream(s, w, plane);

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

  911. 

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

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

  914. 

  915.                     decode_plane_bitstream(s, w, plane);

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

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

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

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

  920.                         }

  921.                     }

  922.                 }

  923. 

  924.                 break;

  925.             case MEDIAN:

  926.                 decode_plane_bitstream(s, w, plane);

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

  928. 

  929.                 y = 1;

  930. 

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

  932.                 if (s->interlaced) {

  933.                     decode_plane_bitstream(s, w, plane);

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

  935.                     y++;

  936.                 }

  937. 

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

  939.                 decode_plane_bitstream(s, w, plane);

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

  941.                 y++;

  942. 

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

  944.                     uint8_t *dst;

  945. 

  946.                     decode_plane_bitstream(s, w, plane);

  947. 

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

  949. 

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

  951.                 }

  952. 

  953.                 break;

  954.             }

  955.         }

  956.         draw_slice(s, p, height);

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

  958.         int y, cy;

  959.         int lefty, leftu, leftv;

  960.         int lefttopy, lefttopu, lefttopv;

  961. 

  962.         if (s->yuy2) {

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

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

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

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

  967. 

  968.             av_log(avctx, AV_LOG_ERROR,

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

  970.             return AVERROR_PATCHWELCOME;

  971.         } else {

  972.             leftv         =

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

  974.             lefty         =

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

  976.             leftu         =

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

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

  979. 

  980.             switch (s->predictor) {

  981.             case LEFT:

  982.             case PLANE:

  983.                 decode_422_bitstream(s, width - 2);

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

  985.                                                    width - 2, lefty);

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

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

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

  989.                 }

  990. 

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

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

  993. 

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

  995.                         decode_gray_bitstream(s, width);

  996. 

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

  998. 

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

  1000.                                                            width, lefty);

  1001.                         if (s->predictor == PLANE) {

  1002.                             if (y > s->interlaced)

  1003.                                 s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  1004.                         }

  1005.                         y++;

  1006.                         if (y >= s->height)

  1007.                             break;

  1008.                     }

  1009. 

  1010.                     draw_slice(s, p, y);

  1011. 

  1012.                     ydst = p->data[0] + p->linesize[0] * y;

  1013.                     udst = p->data[1] + p->linesize[1] * cy;

  1014.                     vdst = p->data[2] + p->linesize[2] * cy;

  1015. 

  1016.                     decode_422_bitstream(s, width);

  1017.                     lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],

  1018.                                                        width, lefty);

  1019.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1020.                         leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);

  1021.                         leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);

  1022.                     }

  1023.                     if (s->predictor == PLANE) {

  1024.                         if (cy > s->interlaced) {

  1025.                             s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  1026.                             if (!(s->flags & CODEC_FLAG_GRAY)) {

  1027.                                 s->hdsp.add_bytes(udst, udst - fake_ustride, width2);

  1028.                                 s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1029.                             }

  1030.                         }

  1031.                     }

  1032.                 }

  1033.                 draw_slice(s, p, height);

  1034. 

  1035.                 break;

  1036.             case MEDIAN:

  1037.                 /* first line except first 2 pixels is left predicted */

  1038.                 decode_422_bitstream(s, width - 2);

  1039.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],

  1040.                                                    width - 2, lefty);

  1041.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  1042.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1043.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1044.                 }

  1045. 

  1046.                 cy = y = 1;

  1047. 

  1048.                 /* second line is left predicted for interlaced case */

  1049.                 if (s->interlaced) {

  1050.                     decode_422_bitstream(s, width);

  1051.                     lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],

  1052.                                                        s->temp[0], width, lefty);

  1053.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1054.                         leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1055.                         leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1056.                     }

  1057.                     y++;

  1058.                     cy++;

  1059.                 }

  1060. 

  1061.                 /* next 4 pixels are left predicted too */

  1062.                 decode_422_bitstream(s, 4);

  1063.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,

  1064.                                                    s->temp[0], 4, lefty);

  1065.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  1066.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1067.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1068.                 }

  1069. 

  1070.                 /* next line except the first 4 pixels is median predicted */

  1071.                 lefttopy = p->data[0][3];

  1072.                 decode_422_bitstream(s, width - 4);

  1073.                 s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,

  1074.                                              p->data[0] + 4, s->temp[0],

  1075.                                              width - 4, &lefty, &lefttopy);

  1076.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  1077.                     lefttopu = p->data[1][1];

  1078.                     lefttopv = p->data[2][1];

  1079.                     s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  1080.                     s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  1081.                 }

  1082.                 y++;

  1083.                 cy++;

  1084. 

  1085.                 for (; y < height; y++, cy++) {

  1086.                     uint8_t *ydst, *udst, *vdst;

  1087. 

  1088.                     if (s->bitstream_bpp == 12) {

  1089.                         while (2 * cy > y) {

  1090.                             decode_gray_bitstream(s, width);

  1091.                             ydst = p->data[0] + p->linesize[0] * y;

  1092.                             s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  1093.                                                          s->temp[0], width,

  1094.                                                          &lefty, &lefttopy);

  1095.                             y++;

  1096.                         }

  1097.                         if (y >= height)

  1098.                             break;

  1099.                     }

  1100.                     draw_slice(s, p, y);

  1101. 

  1102.                     decode_422_bitstream(s, width);

  1103. 

  1104.                     ydst = p->data[0] + p->linesize[0] * y;

  1105.                     udst = p->data[1] + p->linesize[1] * cy;

  1106.                     vdst = p->data[2] + p->linesize[2] * cy;

  1107. 

  1108.                     s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  1109.                                                  s->temp[0], width,

  1110.                                                  &lefty, &lefttopy);

  1111.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1112.                         s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1113.                         s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1114.                     }

  1115.                 }

  1116. 

  1117.                 draw_slice(s, p, height);

  1118.                 break;

  1119.             }

  1120.         }

  1121.     } else {

  1122.         int y;

  1123.         uint8_t left[4];

  1124.         const int last_line = (height - 1) * p->linesize[0];

  1125. 

  1126.         if (s->bitstream_bpp == 32) {

  1127.             left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);

  1128.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1129.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1130.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1131.         } else {

  1132.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1133.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1134.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1135.             left[A] = p->data[0][last_line + A] = 255;

  1136.             skip_bits(&s->gb, 8);

  1137.         }

  1138. 

  1139.         if (s->bgr32) {

  1140.             switch (s->predictor) {

  1141.             case LEFT:

  1142.             case PLANE:

  1143.                 decode_bgr_bitstream(s, width - 1);

  1144.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,

  1145.                                                  s->temp[0], width - 1, left);

  1146. 

  1147.                 for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.

  1148.                     decode_bgr_bitstream(s, width);

  1149. 

  1150.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,

  1151.                                                      s->temp[0], width, left);

  1152.                     if (s->predictor == PLANE) {

  1153.                         if (s->bitstream_bpp != 32)

  1154.                             left[A] = 0;

  1155.                         if ((y & s->interlaced) == 0 &&

  1156.                             y < s->height - 1 - s->interlaced) {

  1157.                             s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,

  1158.                                               p->data[0] + p->linesize[0] * y +

  1159.                                               fake_ystride, fake_ystride);

  1160.                         }

  1161.                     }

  1162.                 }

  1163.                 // just 1 large slice as this is not possible in reverse order

  1164.                 draw_slice(s, p, height);

  1165.                 break;

  1166.             default:

  1167.                 av_log(avctx, AV_LOG_ERROR,

  1168.                        "prediction type not supported!\n");

  1169.             }

  1170.         } else {

  1171.             av_log(avctx, AV_LOG_ERROR,

  1172.                    "BGR24 output is not implemented yet\n");

  1173.             return AVERROR_PATCHWELCOME;

  1174.         }

  1175.     }

  1176.     emms_c();

  1177. 

  1178.     *got_frame = 1;

  1179. 

  1180.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  1181. }

  1182. 

  1183. static av_cold int decode_end(AVCodecContext *avctx)

  1184. {

  1185.     HYuvContext *s = avctx->priv_data;

  1186.     int i;

  1187. 

  1188.     ff_huffyuv_common_end(s);

  1189.     av_freep(&s->bitstream_buffer);

  1190. 

  1191.     for (i = 0; i < 8; i++)

  1192.         ff_free_vlc(&s->vlc[i]);

  1193. 

  1194.     return 0;

  1195. }

  1196. 

  1197. AVCodec ff_huffyuv_decoder = {

  1198.     .name             = "huffyuv",

  1199.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1200.     .type             = AVMEDIA_TYPE_VIDEO,

  1201.     .id               = AV_CODEC_ID_HUFFYUV,

  1202.     .priv_data_size   = sizeof(HYuvContext),

  1203.     .init             = decode_init,

  1204.     .close            = decode_end,

  1205.     .decode           = decode_frame,

  1206.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  1207.                         CODEC_CAP_FRAME_THREADS,

  1208.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1209. };

  1210. 

  1211. #if CONFIG_FFVHUFF_DECODER

  1212. AVCodec ff_ffvhuff_decoder = {

  1213.     .name             = "ffvhuff",

  1214.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1215.     .type             = AVMEDIA_TYPE_VIDEO,

  1216.     .id               = AV_CODEC_ID_FFVHUFF,

  1217.     .priv_data_size   = sizeof(HYuvContext),

  1218.     .init             = decode_init,

  1219.     .close            = decode_end,

  1220.     .decode           = decode_frame,

  1221.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  1222.                         CODEC_CAP_FRAME_THREADS,

  1223.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1224. };

  1225. #endif /* CONFIG_FFVHUFF_DECODER */