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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/imgutils.h"

  41. #include "libavutil/pixdesc.h"

  42. 

  43. #define classic_shift_luma_table_size 42

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

  45.     34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,

  46.     14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,

  47.     10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0,

  48.   0,0,0,0,0,0,0,0,

  49. };

  50. 

  51. #define classic_shift_chroma_table_size 59

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

  53.     66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,

  54.     84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,

  55.     57, 56,  58,  57, 58, 57, 184, 119, 214, 245, 116,  83,  82, 49, 80,  79,

  56.     78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0,

  57.   0,0,0,0,0,0,0,0,

  58. };

  59. 

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

  61.      3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  62.     73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

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

  64.     35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  65.     37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  66.     35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  67.     27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  68.     15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  69.     12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  70.     12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  71.     18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  72.     28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  73.     28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  74.     62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  75.     54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  76.     46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  77. };

  78. 

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

  80.      3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,

  81.      7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,

  82.      11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,

  83.      43,  45,  76,  81,  46,  82,  75,  55,  56, 144,  58,  80,  60,  74, 147,  63,

  84.     143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,

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

  86.      17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,

  87.     112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,

  88.       0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,

  89.     135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,

  90.      52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,

  91.      19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,

  92.       7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,

  93.      83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,

  94.      14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,

  95.       6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,

  96. };

  97. 

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

  99. {

  100.     int i, val, repeat;

  101. 

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

  103.         repeat = get_bits(gb, 3);

  104.         val    = get_bits(gb, 5);

  105.         if (repeat == 0)

  106.             repeat = get_bits(gb, 8);

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

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

  109.             return AVERROR_INVALIDDATA;

  110.         }

  111.         while (repeat--)

  112.             dst[i++] = val;

  113.     }

  114.     return 0;

  115. }

  116. 

  117. static int generate_joint_tables(HYuvContext *s)

  118. {

  119.     int ret;

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

  121.     uint16_t *bits;

  122.     uint8_t *len;

  123.     if (!symbols)

  124.         return AVERROR(ENOMEM);

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

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

  127. 

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

  129.         int p, i, y, u;

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

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

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

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

  134.                 int limit = VLC_BITS - len0;

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

  136.                     continue;

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

  138.                     continue;

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

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

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

  142.                         continue;

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

  144.                         continue;

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

  146.                     len[i]     = len0 + len1;

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

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

  149.                         i++;

  150.                 }

  151.             }

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

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

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

  155.                 goto out;

  156.         }

  157.     } else {

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

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

  160.         int p0 = s->decorrelate;

  161.         int p1 = !s->decorrelate;

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

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

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

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

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

  167.             int limit0 = VLC_BITS - len0;

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

  169.                 continue;

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

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

  172.                 int limit1 = limit0 - len1;

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

  174.                     continue;

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

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

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

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

  179.                         continue;

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

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

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

  183.                     if (s->decorrelate) {

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

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

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

  187.                     } else {

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

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

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

  191.                     }

  192.                     i++;

  193.                 }

  194.             }

  195.         }

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

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

  198.                             bits, 2, 2, 0)) < 0)

  199.             goto out;

  200.     }

  201.     ret = 0;

  202. out:

  203.     av_freep(&symbols);

  204.     return ret;

  205. }

  206. 

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

  208. {

  209.     GetBitContext gb;

  210.     int i, ret;

  211.     int count = 3;

  212. 

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

  214.         return ret;

  215. 

  216.     if (s->version > 2)

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

  218. 

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

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

  221.             return ret;

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

  223.             return ret;

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

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

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

  227.             return ret;

  228.     }

  229. 

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

  231.         return ret;

  232. 

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

  234. }

  235. 

  236. static int read_old_huffman_tables(HYuvContext *s)

  237. {

  238.     GetBitContext gb;

  239.     int i, ret;

  240. 

  241.     init_get_bits(&gb, classic_shift_luma,

  242.                   classic_shift_luma_table_size * 8);

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

  244.         return ret;

  245. 

  246.     init_get_bits(&gb, classic_shift_chroma,

  247.                   classic_shift_chroma_table_size * 8);

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

  249.         return ret;

  250. 

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

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

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

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

  255. 

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

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

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

  259.     }

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

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

  262. 

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

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

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

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

  267.             return ret;

  268.     }

  269. 

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

  271.         return ret;

  272. 

  273.     return 0;

  274. }

  275. 

  276. static av_cold int decode_end(AVCodecContext *avctx)

  277. {

  278.     HYuvContext *s = avctx->priv_data;

  279.     int i;

  280. 

  281.     ff_huffyuv_common_end(s);

  282.     av_freep(&s->bitstream_buffer);

  283. 

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

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

  286. 

  287.     return 0;

  288. }

  289. 

  290. static av_cold int decode_init(AVCodecContext *avctx)

  291. {

  292.     HYuvContext *s = avctx->priv_data;

  293.     int ret;

  294. 

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

  296.     if (ret < 0)

  297.         return ret;

  298. 

  299.     ff_huffyuvdsp_init(&s->hdsp);

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

  301. 

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

  303.     s->bgr32      = 1;

  304. 

  305.     if (avctx->extradata_size) {

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

  307.             avctx->bits_per_coded_sample != 12)

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

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

  310.             s->version = 2;

  311.         else

  312.             s->version = 3;

  313.     } else

  314.         s->version = 0;

  315. 

  316.     s->bps = 8;

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

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

  319.     s->chroma = 1;

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

  321.         int method, interlace;

  322. 

  323.         if (avctx->extradata_size < 4)

  324.             return AVERROR_INVALIDDATA;

  325. 

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

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

  328.         s->predictor     = method & 63;

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

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

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

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

  333.         } else {

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

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

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

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

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

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

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

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

  342.         }

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

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

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

  346. 

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

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

  349.             goto error;

  350.     } else {

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

  352.         case 1:

  353.             s->predictor   = LEFT;

  354.             s->decorrelate = 0;

  355.             break;

  356.         case 2:

  357.             s->predictor   = LEFT;

  358.             s->decorrelate = 1;

  359.             break;

  360.         case 3:

  361.             s->predictor   = PLANE;

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

  363.             break;

  364.         case 4:

  365.             s->predictor   = MEDIAN;

  366.             s->decorrelate = 0;

  367.             break;

  368.         default:

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

  370.             s->decorrelate = 0;

  371.             break;

  372.         }

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

  374.         s->context       = 0;

  375. 

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

  377.             goto error;

  378.     }

  379. 

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

  381.         switch (s->bitstream_bpp) {

  382.         case 12:

  383.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  384.             s->yuv = 1;

  385.             break;

  386.         case 16:

  387.             if (s->yuy2)

  388.                 avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  389.             else

  390.                 avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  391.             s->yuv = 1;

  392.             break;

  393.         case 24:

  394.             if (s->bgr32)

  395.                 avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  396.             else

  397.                 avctx->pix_fmt = AV_PIX_FMT_BGR24;

  398.             break;

  399.         case 32:

  400.             av_assert0(s->bgr32);

  401.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  402.             s->alpha = 1;

  403.             break;

  404.         default:

  405.             ret = AVERROR_INVALIDDATA;

  406.             goto error;

  407.         }

  408.         av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,

  409.                                          &s->chroma_h_shift,

  410.                                          &s->chroma_v_shift);

  411.     } else {

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

  413.         case 0x070:

  414.             avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  415.             break;

  416.         case 0x0F0:

  417.             avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  418.             break;

  419.         case 0x170:

  420.             avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  421.             break;

  422.         case 0x470:

  423.             avctx->pix_fmt = AV_PIX_FMT_GBRP;

  424.             break;

  425.         case 0x480:

  426.             avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  427.             break;

  428.         case 0x490:

  429.             avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  430.             break;

  431.         case 0x4B0:

  432.             avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  433.             break;

  434.         case 0x4D0:

  435.             avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  436.             break;

  437.         case 0x4F0:

  438.             avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  439.             break;

  440.         case 0x570:

  441.             avctx->pix_fmt = AV_PIX_FMT_GBRAP;

  442.             break;

  443.         case 0x670:

  444.             avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  445.             break;

  446.         case 0x680:

  447.             avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  448.             break;

  449.         case 0x690:

  450.             avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  451.             break;

  452.         case 0x6B0:

  453.             avctx->pix_fmt = AV_PIX_FMT_YUV444P12;

  454.             break;

  455.         case 0x6D0:

  456.             avctx->pix_fmt = AV_PIX_FMT_YUV444P14;

  457.             break;

  458.         case 0x6F0:

  459.             avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  460.             break;

  461.         case 0x671:

  462.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  463.             break;

  464.         case 0x681:

  465.             avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  466.             break;

  467.         case 0x691:

  468.             avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  469.             break;

  470.         case 0x6B1:

  471.             avctx->pix_fmt = AV_PIX_FMT_YUV422P12;

  472.             break;

  473.         case 0x6D1:

  474.             avctx->pix_fmt = AV_PIX_FMT_YUV422P14;

  475.             break;

  476.         case 0x6F1:

  477.             avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  478.             break;

  479.         case 0x672:

  480.             avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  481.             break;

  482.         case 0x674:

  483.             avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  484.             break;

  485.         case 0x675:

  486.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  487.             break;

  488.         case 0x685:

  489.             avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  490.             break;

  491.         case 0x695:

  492.             avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  493.             break;

  494.         case 0x6B5:

  495.             avctx->pix_fmt = AV_PIX_FMT_YUV420P12;

  496.             break;

  497.         case 0x6D5:

  498.             avctx->pix_fmt = AV_PIX_FMT_YUV420P14;

  499.             break;

  500.         case 0x6F5:

  501.             avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  502.             break;

  503.         case 0x67A:

  504.             avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  505.             break;

  506.         case 0x770:

  507.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  508.             break;

  509.         case 0x780:

  510.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;

  511.             break;

  512.         case 0x790:

  513.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;

  514.             break;

  515.         case 0x7F0:

  516.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  517.             break;

  518.         case 0x771:

  519.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  520.             break;

  521.         case 0x781:

  522.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;

  523.             break;

  524.         case 0x791:

  525.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;

  526.             break;

  527.         case 0x7F1:

  528.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  529.             break;

  530.         case 0x775:

  531.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  532.             break;

  533.         case 0x785:

  534.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;

  535.             break;

  536.         case 0x795:

  537.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;

  538.             break;

  539.         case 0x7F5:

  540.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;

  541.             break;

  542.         default:

  543.             ret = AVERROR_INVALIDDATA;

  544.             goto error;

  545.         }

  546.     }

  547. 

  548.     ff_huffyuv_common_init(avctx);

  549. 

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

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

  552.         ret = AVERROR_INVALIDDATA;

  553.         goto error;

  554.     }

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

  556.         avctx->width % 4) {

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

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

  559.         ret = AVERROR_INVALIDDATA;

  560.         goto error;

  561.     }

  562. 

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

  564.         ff_huffyuv_common_end(s);

  565.         goto error;

  566.     }

  567. 

  568.     return 0;

  569.   error:

  570.     decode_end(avctx);

  571.     return ret;

  572. }

  573. 

  574. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  575. {

  576.     HYuvContext *s = avctx->priv_data;

  577.     int i, ret;

  578. 

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

  580.         ff_huffyuv_common_end(s);

  581.         return ret;

  582.     }

  583. 

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

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

  586. 

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

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

  589.                                        avctx->extradata_size)) < 0)

  590.             return ret;

  591.     } else {

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

  593.             return ret;

  594.     }

  595. 

  596.     return 0;

  597. }

  598. 

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

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

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

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

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

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

  605.         UPDATE_CACHE(name, gb);                             \

  606.                                                             \

  607.         nb_bits = -n;                                       \

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

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

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

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

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

  613.             UPDATE_CACHE(name, gb);                         \

  614.                                                             \

  615.             nb_bits = -n;                                   \

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

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

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

  619.         }                                                   \

  620.     }                                                       \

  621.     dst = code;                                             \

  622.     LAST_SKIP_BITS(name, gb, n)

  623. 

  624. 

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

  626.                      bits, max_depth, OP)                           \

  627.     do {                                                            \

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

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

  630.                                                                     \

  631.         if (n<=0) {                                                 \

  632.             int nb_bits;                                            \

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

  634.                                                                     \

  635.             UPDATE_CACHE(re, gb);                                   \

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

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

  638.         } else {                                                    \

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

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

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

  642.         }                                                           \

  643.     } while (0)

  644. 

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

  646. 

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

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

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

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

  651. 

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

  653. {

  654.     int i, icount;

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

  656.     count /= 2;

  657. 

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

  659.     if (count >= icount) {

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

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

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

  663.         }

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

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

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

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

  668.         }

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

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

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

  672.     } else {

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

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

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

  676.         }

  677.     }

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

  679. }

  680. 

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

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

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

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

  685. 

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

  687. 

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

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

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

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

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

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

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

  695. }

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

  697. {

  698.     int i, count = width/2;

  699. 

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

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

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

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

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

  705.             }

  706.         } else {

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

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

  709.             }

  710.         }

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

  712.             unsigned int index;

  713.             int nb_bits, code, n;

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

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

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

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

  718.         }

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

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

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

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

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

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

  725.             }

  726.         } else {

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

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

  729.             }

  730.         }

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

  732.             unsigned int index;

  733.             int nb_bits, code, n;

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

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

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

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

  738.         }

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

  740.     } else {

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

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

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

  744.             }

  745.         } else {

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

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

  748.             }

  749.         }

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

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

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

  753.         }

  754.     }

  755. }

  756. 

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

  758. {

  759.     int i;

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

  761.     count /= 2;

  762. 

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

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

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

  766.         }

  767.     } else {

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

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

  770.         }

  771.     }

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

  773. }

  774. 

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

  776.                                           int decorrelate, int alpha)

  777. {

  778.     int i;

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

  780. 

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

  782.         unsigned int index;

  783.         int code, n, nb_bits;

  784. 

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

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

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

  788. 

  789.         if (n>0) {

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

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

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

  793.         } else {

  794.             if (decorrelate) {

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

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

  797. 

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

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

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

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

  802. 

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

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

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

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

  807.             } else {

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

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

  810. 

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

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

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

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

  815. 

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

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

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

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

  820.             }

  821.         }

  822.         if (alpha) {

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

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

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

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

  827.         } else

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

  829.     }

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

  831. }

  832. 

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

  834. {

  835.     if (s->decorrelate) {

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

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

  838.         else

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

  840.     } else {

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

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

  843.         else

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

  845.     }

  846. }

  847. 

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

  849. {

  850.     int h, cy, i;

  851.     int offset[AV_NUM_DATA_POINTERS];

  852. 

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

  854.         return;

  855. 

  856.     h  = y - s->last_slice_end;

  857.     y -= h;

  858. 

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

  860.         cy = y >> 1;

  861.     else

  862.         cy = y;

  863. 

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

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

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

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

  868.         offset[i] = 0;

  869.     emms_c();

  870. 

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

  872. 

  873.     s->last_slice_end = y + h;

  874. }

  875. 

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

  877. {

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

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

  880.     } else {

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

  882.     }

  883. }

  884. 

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

  886. {

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

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

  889.     } else {

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

  891.     }

  892. }

  893. 

  894. 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)

  895. {

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

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

  898.     } else {

  899.         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);

  900.     }

  901. }

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

  903.                         AVPacket *avpkt)

  904. {

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

  906.     int buf_size       = avpkt->size;

  907.     HYuvContext *s = avctx->priv_data;

  908.     const int width  = s->width;

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

  910.     const int height = s->height;

  911.     int fake_ystride, fake_ustride, fake_vstride;

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

  913.     AVFrame *const p = data;

  914.     int table_size = 0, ret;

  915. 

  916.     av_fast_padded_malloc(&s->bitstream_buffer,

  917.                    &s->bitstream_buffer_size,

  918.                    buf_size);

  919.     if (!s->bitstream_buffer)

  920.         return AVERROR(ENOMEM);

  921. 

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

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

  924. 

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

  926.         return ret;

  927. 

  928.     if (s->context) {

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

  930.         if (table_size < 0)

  931.             return table_size;

  932.     }

  933. 

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

  935.         return AVERROR_INVALIDDATA;

  936. 

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

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

  939.         return ret;

  940. 

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

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

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

  944. 

  945.     s->last_slice_end = 0;

  946. 

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

  948.         int plane;

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

  950.             int left, lefttop, y;

  951.             int w = width;

  952.             int h = height;

  953.             int fake_stride = fake_ystride;

  954. 

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

  956.                 w >>= s->chroma_h_shift;

  957.                 h >>= s->chroma_v_shift;

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

  959.             }

  960. 

  961.             switch (s->predictor) {

  962.             case LEFT:

  963.             case PLANE:

  964.                 decode_plane_bitstream(s, w, plane);

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

  966. 

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

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

  969. 

  970.                     decode_plane_bitstream(s, w, plane);

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

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

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

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

  975.                         }

  976.                     }

  977.                 }

  978. 

  979.                 break;

  980.             case MEDIAN:

  981.                 decode_plane_bitstream(s, w, plane);

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

  983. 

  984.                 y = 1;

  985. 

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

  987.                 if (s->interlaced) {

  988.                     decode_plane_bitstream(s, w, plane);

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

  990.                     y++;

  991.                 }

  992. 

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

  994.                 decode_plane_bitstream(s, w, plane);

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

  996.                 y++;

  997. 

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

  999.                     uint8_t *dst;

  1000. 

  1001.                     decode_plane_bitstream(s, w, plane);

  1002. 

  1003.                     dst = p->data[plane] + p->linesize[plane] * y;

  1004. 

  1005.                     add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);

  1006.                 }

  1007. 

  1008.                 break;

  1009.             }

  1010.         }

  1011.         draw_slice(s, p, height);

  1012.     } else if (s->bitstream_bpp < 24) {

  1013.         int y, cy;

  1014.         int lefty, leftu, leftv;

  1015.         int lefttopy, lefttopu, lefttopv;

  1016. 

  1017.         if (s->yuy2) {

  1018.             p->data[0][3] = get_bits(&s->gb, 8);

  1019.             p->data[0][2] = get_bits(&s->gb, 8);

  1020.             p->data[0][1] = get_bits(&s->gb, 8);

  1021.             p->data[0][0] = get_bits(&s->gb, 8);

  1022. 

  1023.             av_log(avctx, AV_LOG_ERROR,

  1024.                    "YUY2 output is not implemented yet\n");

  1025.             return AVERROR_PATCHWELCOME;

  1026.         } else {

  1027.             leftv         =

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

  1029.             lefty         =

  1030.             p->data[0][1] = get_bits(&s->gb, 8);

  1031.             leftu         =

  1032.             p->data[1][0] = get_bits(&s->gb, 8);

  1033.             p->data[0][0] = get_bits(&s->gb, 8);

  1034. 

  1035.             switch (s->predictor) {

  1036.             case LEFT:

  1037.             case PLANE:

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

  1047.                     uint8_t *ydst, *udst, *vdst;

  1048. 

  1049.                     if (s->bitstream_bpp == 12) {

  1050.                         decode_gray_bitstream(s, width);

  1051. 

  1052.                         ydst = p->data[0] + p->linesize[0] * y;

  1053. 

  1054.                         lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],

  1055.                                                            width, lefty);

  1056.                         if (s->predictor == PLANE) {

  1057.                             if (y > s->interlaced)

  1058.                                 s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  1059.                         }

  1060.                         y++;

  1061.                         if (y >= s->height)

  1062.                             break;

  1063.                     }

  1064. 

  1065.                     draw_slice(s, p, y);

  1066. 

  1067.                     ydst = p->data[0] + p->linesize[0] * y;

  1068.                     udst = p->data[1] + p->linesize[1] * cy;

  1069.                     vdst = p->data[2] + p->linesize[2] * cy;

  1070. 

  1071.                     decode_422_bitstream(s, width);

  1072.                     lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],

  1073.                                                        width, lefty);

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

  1075.                         leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);

  1076.                         leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);

  1077.                     }

  1078.                     if (s->predictor == PLANE) {

  1079.                         if (cy > s->interlaced) {

  1080.                             s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  1081.                             if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1082.                                 s->hdsp.add_bytes(udst, udst - fake_ustride, width2);

  1083.                                 s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1084.                             }

  1085.                         }

  1086.                     }

  1087.                 }

  1088.                 draw_slice(s, p, height);

  1089. 

  1090.                 break;

  1091.             case MEDIAN:

  1092.                 /* first line except first 2 pixels is left predicted */

  1093.                 decode_422_bitstream(s, width - 2);

  1094.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],

  1095.                                                    width - 2, lefty);

  1096.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1097.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1098.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1099.                 }

  1100. 

  1101.                 cy = y = 1;

  1102. 

  1103.                 /* second line is left predicted for interlaced case */

  1104.                 if (s->interlaced) {

  1105.                     decode_422_bitstream(s, width);

  1106.                     lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],

  1107.                                                        s->temp[0], width, lefty);

  1108.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1109.                         leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1110.                         leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1111.                     }

  1112.                     y++;

  1113.                     cy++;

  1114.                 }

  1115. 

  1116.                 /* next 4 pixels are left predicted too */

  1117.                 decode_422_bitstream(s, 4);

  1118.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,

  1119.                                                    s->temp[0], 4, lefty);

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

  1121.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1122.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1123.                 }

  1124. 

  1125.                 /* next line except the first 4 pixels is median predicted */

  1126.                 lefttopy = p->data[0][3];

  1127.                 decode_422_bitstream(s, width - 4);

  1128.                 s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,

  1129.                                              p->data[0] + 4, s->temp[0],

  1130.                                              width - 4, &lefty, &lefttopy);

  1131.                 if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1132.                     lefttopu = p->data[1][1];

  1133.                     lefttopv = p->data[2][1];

  1134.                     s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  1135.                     s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  1136.                 }

  1137.                 y++;

  1138.                 cy++;

  1139. 

  1140.                 for (; y < height; y++, cy++) {

  1141.                     uint8_t *ydst, *udst, *vdst;

  1142. 

  1143.                     if (s->bitstream_bpp == 12) {

  1144.                         while (2 * cy > y) {

  1145.                             decode_gray_bitstream(s, width);

  1146.                             ydst = p->data[0] + p->linesize[0] * y;

  1147.                             s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  1148.                                                          s->temp[0], width,

  1149.                                                          &lefty, &lefttopy);

  1150.                             y++;

  1151.                         }

  1152.                         if (y >= height)

  1153.                             break;

  1154.                     }

  1155.                     draw_slice(s, p, y);

  1156. 

  1157.                     decode_422_bitstream(s, width);

  1158. 

  1159.                     ydst = p->data[0] + p->linesize[0] * y;

  1160.                     udst = p->data[1] + p->linesize[1] * cy;

  1161.                     vdst = p->data[2] + p->linesize[2] * cy;

  1162. 

  1163.                     s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,

  1164.                                                  s->temp[0], width,

  1165.                                                  &lefty, &lefttopy);

  1166.                     if (!(s->flags & AV_CODEC_FLAG_GRAY)) {

  1167.                         s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1168.                         s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1169.                     }

  1170.                 }

  1171. 

  1172.                 draw_slice(s, p, height);

  1173.                 break;

  1174.             }

  1175.         }

  1176.     } else {

  1177.         int y;

  1178.         uint8_t left[4];

  1179.         const int last_line = (height - 1) * p->linesize[0];

  1180. 

  1181.         if (s->bitstream_bpp == 32) {

  1182.             left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);

  1183.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1184.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1185.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1186.         } else {

  1187.             left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);

  1188.             left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);

  1189.             left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);

  1190.             left[A] = p->data[0][last_line + A] = 255;

  1191.             skip_bits(&s->gb, 8);

  1192.         }

  1193. 

  1194.         if (s->bgr32) {

  1195.             switch (s->predictor) {

  1196.             case LEFT:

  1197.             case PLANE:

  1198.                 decode_bgr_bitstream(s, width - 1);

  1199.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,

  1200.                                                  s->temp[0], width - 1, left);

  1201. 

  1202.                 for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.

  1203.                     decode_bgr_bitstream(s, width);

  1204. 

  1205.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,

  1206.                                                      s->temp[0], width, left);

  1207.                     if (s->predictor == PLANE) {

  1208.                         if (s->bitstream_bpp != 32)

  1209.                             left[A] = 0;

  1210.                         if (y < s->height - 1 - s->interlaced) {

  1211.                             s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,

  1212.                                               p->data[0] + p->linesize[0] * y +

  1213.                                               fake_ystride, 4 * width);

  1214.                         }

  1215.                     }

  1216.                 }

  1217.                 // just 1 large slice as this is not possible in reverse order

  1218.                 draw_slice(s, p, height);

  1219.                 break;

  1220.             default:

  1221.                 av_log(avctx, AV_LOG_ERROR,

  1222.                        "prediction type not supported!\n");

  1223.             }

  1224.         } else {

  1225.             av_log(avctx, AV_LOG_ERROR,

  1226.                    "BGR24 output is not implemented yet\n");

  1227.             return AVERROR_PATCHWELCOME;

  1228.         }

  1229.     }

  1230.     emms_c();

  1231. 

  1232.     *got_frame = 1;

  1233. 

  1234.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  1235. }

  1236. 

  1237. AVCodec ff_huffyuv_decoder = {

  1238.     .name             = "huffyuv",

  1239.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1240.     .type             = AVMEDIA_TYPE_VIDEO,

  1241.     .id               = AV_CODEC_ID_HUFFYUV,

  1242.     .priv_data_size   = sizeof(HYuvContext),

  1243.     .init             = decode_init,

  1244.     .close            = decode_end,

  1245.     .decode           = decode_frame,

  1246.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1247.                         AV_CODEC_CAP_FRAME_THREADS,

  1248.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1249. };

  1250. 

  1251. #if CONFIG_FFVHUFF_DECODER

  1252. AVCodec ff_ffvhuff_decoder = {

  1253.     .name             = "ffvhuff",

  1254.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1255.     .type             = AVMEDIA_TYPE_VIDEO,

  1256.     .id               = AV_CODEC_ID_FFVHUFF,

  1257.     .priv_data_size   = sizeof(HYuvContext),

  1258.     .init             = decode_init,

  1259.     .close            = decode_end,

  1260.     .decode           = decode_frame,

  1261.     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1262.                         AV_CODEC_CAP_FRAME_THREADS,

  1263.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1264. };

  1265. #endif /* CONFIG_FFVHUFF_DECODER */