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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. #include "avcodec.h"

  34. #include "get_bits.h"

  35. #include "huffyuv.h"

  36. #include "huffyuvdsp.h"

  37. #include "thread.h"

  38. #include "libavutil/pixdesc.h"

  39. 

  40. #define classic_shift_luma_table_size 42

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

  42.   34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,

  43.   16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,

  44.   69,68, 0,

  45.   0,0,0,0,0,0,0,0,

  46. };

  47. 

  48. #define classic_shift_chroma_table_size 59

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

  50.   66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,

  51.   56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,

  52.   214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0,

  53.   0,0,0,0,0,0,0,0,

  54. };

  55. 

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

  57.     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

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

  59.    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  60.    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  61.    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  62.    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  63.    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  64.    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  65.    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  66.    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  67.    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  68.    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  69.    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  70.    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

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

  72.    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  73. };

  74. 

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

  76.     3,  1,  2,  2,  2,  2,  3,  3,  7,  5,  7,  5,  8,  6, 11,  9,

  77.     7, 13, 11, 10,  9,  8,  7,  5,  9,  7,  6,  4,  7,  5,  8,  7,

  78.    11,  8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,

  79.    43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,

  80.   143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

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

  82.    17, 14,  5,  6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,

  83.   112,113,114,115,  4,117,118, 92, 94,121,122,  3,124,103,  2,  1,

  84.     0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,

  85.   135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,

  86.    52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,

  87.    19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10,  9,  8, 36,

  88.     7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,

  89.    83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,

  90.    14, 16, 17, 18, 20, 21, 12, 14, 15,  9, 10,  6,  9,  6,  5,  8,

  91.     6, 12,  8, 10,  7,  9,  6,  4,  6,  2,  2,  3,  3,  3,  3,  2,

  92. };

  93. 

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

  95. {

  96.     int i, val, repeat;

  97. 

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

  99.         repeat = get_bits(gb, 3);

  100.         val    = get_bits(gb, 5);

  101.         if (repeat == 0)

  102.             repeat = get_bits(gb, 8);

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

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

  105.             return -1;

  106.         }

  107.         while (repeat--)

  108.             dst[i++] = val;

  109.     }

  110.     return 0;

  111. }

  112. 

  113. static int generate_joint_tables(HYuvContext *s)

  114. {

  115.     uint16_t symbols[1 << VLC_BITS];

  116.     uint16_t bits[1 << VLC_BITS];

  117.     uint8_t len[1 << VLC_BITS];

  118.     int ret;

  119. 

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

  121.         int p, i, y, u;

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

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

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

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

  126.                 int limit = VLC_BITS - len0;

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

  128.                     continue;

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

  130.                     continue;

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

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

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

  134.                         continue;

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

  136.                         continue;

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

  138.                     len[i] = len0 + len1;

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

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

  141.                         i++;

  142.                 }

  143.             }

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

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

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

  147.                 return ret;

  148.         }

  149.     } else {

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

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

  152.         int p0 = s->decorrelate;

  153.         int p1 = !s->decorrelate;

  154.         // restrict the range to +/-16 because that's pretty much guaranteed to

  155.         // cover all the combinations that fit in 11 bits total, and it doesn't

  156.         // matter if we miss a few rare codes.

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

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

  159.             int limit0 = VLC_BITS - len0;

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

  161.                 continue;

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

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

  164.                 int limit1 = limit0 - len1;

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

  166.                     continue;

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

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

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

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

  171.                         continue;

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

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

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

  175.                     if (s->decorrelate) {

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

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

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

  179.                     } else {

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

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

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

  183.                     }

  184.                     i++;

  185.                 }

  186.             }

  187.         }

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

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

  190.             return ret;

  191.     }

  192.     return 0;

  193. }

  194. 

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

  196. {

  197.     GetBitContext gb;

  198.     int i;

  199.     int ret;

  200.     int count = 3;

  201. 

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

  203. 

  204.     if (s->version > 2)

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

  206. 

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

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

  209.             return -1;

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

  211.             return -1;

  212.         }

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

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

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

  216.             return ret;

  217.     }

  218. 

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

  220.         return ret;

  221. 

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

  223. }

  224. 

  225. static int read_old_huffman_tables(HYuvContext *s)

  226. {

  227.     GetBitContext gb;

  228.     int i;

  229.     int ret;

  230. 

  231.     init_get_bits(&gb, classic_shift_luma,

  232.                   classic_shift_luma_table_size * 8);

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

  234.         return -1;

  235. 

  236.     init_get_bits(&gb, classic_shift_chroma,

  237.                   classic_shift_chroma_table_size * 8);

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

  239.         return -1;

  240. 

  241.     for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma  [i];

  242.     for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];

  243. 

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

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

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

  247.     }

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

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

  250. 

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

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

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

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

  255.             return ret;

  256.     }

  257. 

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

  259.         return ret;

  260. 

  261.     return 0;

  262. }

  263. 

  264. static av_cold int decode_init(AVCodecContext *avctx)

  265. {

  266.     HYuvContext *s = avctx->priv_data;

  267. 

  268.     ff_huffyuvdsp_init(&s->hdsp);

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

  270. 

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

  272. 

  273.     s->bgr32 = 1;

  274. 

  275.     if (avctx->extradata_size) {

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

  277.             avctx->bits_per_coded_sample != 12)

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

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

  280.             s->version = 2;

  281.         else

  282.             s->version = 3;

  283.     } else

  284.         s->version = 0;

  285. 

  286.     s->bps = 8;

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

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

  289.     s->chroma = 1;

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

  291.         int method, interlace;

  292. 

  293.         if (avctx->extradata_size < 4)

  294.             return -1;

  295. 

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

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

  298.         s->predictor = method & 63;

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

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

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

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

  303.         } else {

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

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

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

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

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

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

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

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

  312.         }

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

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

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

  316. 

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

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

  319.             return AVERROR_INVALIDDATA;

  320.     }else{

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

  322.         case 1:

  323.             s->predictor = LEFT;

  324.             s->decorrelate = 0;

  325.             break;

  326.         case 2:

  327.             s->predictor = LEFT;

  328.             s->decorrelate = 1;

  329.             break;

  330.         case 3:

  331.             s->predictor = PLANE;

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

  333.             break;

  334.         case 4:

  335.             s->predictor = MEDIAN;

  336.             s->decorrelate = 0;

  337.             break;

  338.         default:

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

  340.             s->decorrelate = 0;

  341.             break;

  342.         }

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

  344.         s->context = 0;

  345. 

  346.         if (read_old_huffman_tables(s) < 0)

  347.             return AVERROR_INVALIDDATA;

  348.     }

  349. 

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

  351.         switch (s->bitstream_bpp) {

  352.         case 12:

  353.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  354.             s->yuv = 1;

  355.             break;

  356.         case 16:

  357.             if (s->yuy2) {

  358.                 avctx->pix_fmt = AV_PIX_FMT_YUYV422;

  359.             } else {

  360.                 avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  361.             }

  362.             s->yuv = 1;

  363.             break;

  364.         case 24:

  365.             if (s->bgr32) {

  366.                 avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  367.             } else {

  368.                 avctx->pix_fmt = AV_PIX_FMT_BGR24;

  369.             }

  370.             break;

  371.         case 32:

  372.             av_assert0(s->bgr32);

  373.             avctx->pix_fmt = AV_PIX_FMT_RGB32;

  374.             s->alpha = 1;

  375.             break;

  376.         default:

  377.             return AVERROR_INVALIDDATA;

  378.         }

  379.         av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,

  380.                                          &s->chroma_h_shift,

  381.                                          &s->chroma_v_shift);

  382.     } else {

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

  384.         case 0x070:

  385.             avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  386.             break;

  387.         case 0x0F0:

  388.             avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  389.             break;

  390.         case 0x170:

  391.             avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  392.             break;

  393.         case 0x470:

  394.             avctx->pix_fmt = AV_PIX_FMT_GBRP;

  395.             break;

  396.         case 0x480:

  397.             avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  398.             break;

  399.         case 0x490:

  400.             avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  401.             break;

  402.         case 0x4B0:

  403.             avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  404.             break;

  405.         case 0x4D0:

  406.             avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  407.             break;

  408.         case 0x4F0:

  409.             avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  410.             break;

  411.         case 0x570:

  412.             avctx->pix_fmt = AV_PIX_FMT_GBRAP;

  413.             break;

  414.         case 0x670:

  415.             avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  416.             break;

  417.         case 0x680:

  418.             avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  419.             break;

  420.         case 0x690:

  421.             avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  422.             break;

  423.         case 0x6B0:

  424.             avctx->pix_fmt = AV_PIX_FMT_YUV444P12;

  425.             break;

  426.         case 0x6D0:

  427.             avctx->pix_fmt = AV_PIX_FMT_YUV444P14;

  428.             break;

  429.         case 0x6F0:

  430.             avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  431.             break;

  432.         case 0x671:

  433.             avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  434.             break;

  435.         case 0x681:

  436.             avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  437.             break;

  438.         case 0x691:

  439.             avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  440.             break;

  441.         case 0x6B1:

  442.             avctx->pix_fmt = AV_PIX_FMT_YUV422P12;

  443.             break;

  444.         case 0x6D1:

  445.             avctx->pix_fmt = AV_PIX_FMT_YUV422P14;

  446.             break;

  447.         case 0x6F1:

  448.             avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  449.             break;

  450.         case 0x672:

  451.             avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  452.             break;

  453.         case 0x674:

  454.             avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  455.             break;

  456.         case 0x675:

  457.             avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  458.             break;

  459.         case 0x685:

  460.             avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  461.             break;

  462.         case 0x695:

  463.             avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  464.             break;

  465.         case 0x6B5:

  466.             avctx->pix_fmt = AV_PIX_FMT_YUV420P12;

  467.             break;

  468.         case 0x6D5:

  469.             avctx->pix_fmt = AV_PIX_FMT_YUV420P14;

  470.             break;

  471.         case 0x6F5:

  472.             avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  473.             break;

  474.         case 0x67A:

  475.             avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  476.             break;

  477.         case 0x770:

  478.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  479.             break;

  480.         case 0x780:

  481.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;

  482.             break;

  483.         case 0x790:

  484.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;

  485.             break;

  486.         case 0x7F0:

  487.             avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;

  488.             break;

  489.         case 0x771:

  490.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  491.             break;

  492.         case 0x781:

  493.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;

  494.             break;

  495.         case 0x791:

  496.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;

  497.             break;

  498.         case 0x7F1:

  499.             avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;

  500.             break;

  501.         case 0x775:

  502.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  503.             break;

  504.         case 0x785:

  505.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;

  506.             break;

  507.         case 0x795:

  508.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;

  509.             break;

  510.         case 0x7F5:

  511.             avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;

  512.             break;

  513.         default:

  514.             return AVERROR_INVALIDDATA;

  515.         }

  516.     }

  517. 

  518.     ff_huffyuv_common_init(avctx);

  519. 

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

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

  522.         return AVERROR_INVALIDDATA;

  523.     }

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

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

  526.         return AVERROR_INVALIDDATA;

  527.     }

  528.     if (ff_huffyuv_alloc_temp(s)) {

  529.         ff_huffyuv_common_end(s);

  530.         return AVERROR(ENOMEM);

  531.     }

  532. 

  533.     return 0;

  534. }

  535. 

  536. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  537. {

  538.     HYuvContext *s = avctx->priv_data;

  539.     int i;

  540. 

  541.     if (ff_huffyuv_alloc_temp(s)) {

  542.         ff_huffyuv_common_end(s);

  543.         return AVERROR(ENOMEM);

  544.     }

  545. 

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

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

  548. 

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

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

  551.                                 avctx->extradata_size) < 0)

  552.             return AVERROR_INVALIDDATA;

  553.     } else {

  554.         if (read_old_huffman_tables(s) < 0)

  555.             return AVERROR_INVALIDDATA;

  556.     }

  557. 

  558.     return 0;

  559. }

  560. 

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

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

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

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

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

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

  567.         UPDATE_CACHE(name, gb);                             \

  568.                                                             \

  569.         nb_bits = -n;                                       \

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

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

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

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

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

  575.             UPDATE_CACHE(name, gb);                         \

  576.                                                             \

  577.             nb_bits = -n;                                   \

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

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

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

  581.         }                                                   \

  582.     }                                                       \

  583.     dst = code;                                             \

  584.     LAST_SKIP_BITS(name, gb, n)

  585. 

  586. 

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

  588.                      bits, max_depth, OP)                           \

  589.     do {                                                            \

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

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

  592.                                                                     \

  593.         if (n<=0) {                                                 \

  594.             int nb_bits;                                            \

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

  596.                                                                     \

  597.             UPDATE_CACHE(re, gb);                                   \

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

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

  600.         } else {                                                    \

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

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

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

  604.         }                                                           \

  605.     } while (0)

  606. 

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

  608. 

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

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

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

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

  613. 

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

  615. {

  616.     int i;

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

  618.     count /= 2;

  619. 

  620.     if (count >= (get_bits_left(&s->gb)) / (32 * 4)) {

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

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

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

  624.         }

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

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

  627.             s->temp[0][2 * i + 1] = s->temp[2][i] = 128;

  628.     } else {

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

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

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

  632.         }

  633.     }

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

  635. }

  636. 

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

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

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

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

  641. 

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

  643. 

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

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

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

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

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

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

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

  651. }

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

  653. {

  654.     int i;

  655. 

  656.     count/=2;

  657. 

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

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

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

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

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

  663.             }

  664.         } else {

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

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

  667.             }

  668.         }

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

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

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

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

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

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

  675.             }

  676.         } else {

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

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

  679.             }

  680.         }

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

  682.     } else {

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

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

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

  686.             }

  687.         } else {

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

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

  690.             }

  691.         }

  692.     }

  693. }

  694. 

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

  696. {

  697.     int i;

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

  699.     count/=2;

  700. 

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

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

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

  704.         }

  705.     } else {

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

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

  708.         }

  709.     }

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

  711. }

  712. 

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

  714.                                           int decorrelate, int alpha)

  715. {

  716.     int i;

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

  718. 

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

  720.         unsigned int index;

  721.         int code, n;

  722. 

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

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

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

  726. 

  727.         if (n>0) {

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

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

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

  731.         } else {

  732.             int nb_bits;

  733.             if(decorrelate) {

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

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

  736. 

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

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

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

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

  741. 

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

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

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

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

  746.             } else {

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

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

  749. 

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

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

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

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

  754. 

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

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

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

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

  759.             }

  760.             if (alpha) {

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

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

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

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

  765.             }

  766.         }

  767.     }

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

  769. }

  770. 

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

  772. {

  773.     if (s->decorrelate) {

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

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

  776.         else

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

  778.     } else {

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

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

  781.         else

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

  783.     }

  784. }

  785. 

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

  787. {

  788.     int h, cy, i;

  789.     int offset[AV_NUM_DATA_POINTERS];

  790. 

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

  792.         return;

  793. 

  794.     h = y - s->last_slice_end;

  795.     y -= h;

  796. 

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

  798.         cy = y>>1;

  799.     } else {

  800.         cy = y;

  801.     }

  802. 

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

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

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

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

  807.         offset[i] = 0;

  808.     emms_c();

  809. 

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

  811. 

  812.     s->last_slice_end = y + h;

  813. }

  814. 

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

  816. {

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

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

  819.     } else {

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

  821.     }

  822. }

  823. 

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

  825. {

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

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

  828.     } else {

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

  830.     }

  831. }

  832. 

  833. 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)

  834. {

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

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

  837.     } else {

  838.         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);

  839.     }

  840. }

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

  842.                         AVPacket *avpkt)

  843. {

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

  845.     int buf_size = avpkt->size;

  846.     HYuvContext *s = avctx->priv_data;

  847.     const int width = s->width;

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

  849.     const int height = s->height;

  850.     int fake_ystride, fake_ustride, fake_vstride;

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

  852.     AVFrame * const p = data;

  853.     int table_size = 0, ret;

  854. 

  855.     av_fast_padded_malloc(&s->bitstream_buffer,

  856.                    &s->bitstream_buffer_size,

  857.                    buf_size);

  858.     if (!s->bitstream_buffer)

  859.         return AVERROR(ENOMEM);

  860. 

  861.     s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,

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

  863. 

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

  865.         return ret;

  866. 

  867.     if (s->context) {

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

  869.         if (table_size < 0)

  870.             return AVERROR_INVALIDDATA;

  871.     }

  872. 

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

  874.         return AVERROR_INVALIDDATA;

  875. 

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

  877.                   (buf_size-table_size) * 8);

  878. 

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

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

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

  882. 

  883.     s->last_slice_end = 0;

  884. 

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

  886.         int plane;

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

  888.             int left, lefttop, y;

  889.             int w = width;

  890.             int h = height;

  891.             int fake_stride = fake_ystride;

  892. 

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

  894.                 w >>= s->chroma_h_shift;

  895.                 h >>= s->chroma_v_shift;

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

  897.             }

  898. 

  899.             switch (s->predictor) {

  900.             case LEFT:

  901.             case PLANE:

  902.                 decode_plane_bitstream(s, w, plane);

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

  904. 

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

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

  907. 

  908.                     decode_plane_bitstream(s, w, plane);

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

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

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

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

  913.                         }

  914.                     }

  915.                 }

  916. 

  917.                 break;

  918.             case MEDIAN:

  919.                 decode_plane_bitstream(s, w, plane);

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

  921. 

  922.                 y = 1;

  923. 

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

  925.                 if (s->interlaced) {

  926.                     decode_plane_bitstream(s, w, plane);

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

  928.                     y++;

  929.                 }

  930. 

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

  932.                 decode_plane_bitstream(s, w, plane);

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

  934.                 y++;

  935. 

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

  937.                     uint8_t *dst;

  938. 

  939.                     decode_plane_bitstream(s, w, plane);

  940. 

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

  942. 

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

  944.                 }

  945. 

  946.                 break;

  947.             }

  948.         }

  949.         draw_slice(s, p, height);

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

  951.         int y, cy;

  952.         int lefty, leftu, leftv;

  953.         int lefttopy, lefttopu, lefttopv;

  954. 

  955.         if (s->yuy2) {

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

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

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

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

  960. 

  961.             av_log(avctx, AV_LOG_ERROR,

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

  963.             return AVERROR_PATCHWELCOME;

  964.         } else {

  965. 

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

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

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

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

  970. 

  971.             switch (s->predictor) {

  972.             case LEFT:

  973.             case PLANE:

  974.                 decode_422_bitstream(s, width-2);

  975.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0], width - 2, lefty);

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

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

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

  979.                 }

  980. 

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

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

  983. 

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

  985.                         decode_gray_bitstream(s, width);

  986. 

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

  988. 

  989.                         lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0], width, lefty);

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

  991.                             if (y > s->interlaced)

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

  993.                         }

  994.                         y++;

  995.                         if (y >= s->height) break;

  996.                     }

  997. 

  998.                     draw_slice(s, p, y);

  999. 

  1000.                     ydst = p->data[0] + p->linesize[0]*y;

  1001.                     udst = p->data[1] + p->linesize[1]*cy;

  1002.                     vdst = p->data[2] + p->linesize[2]*cy;

  1003. 

  1004.                     decode_422_bitstream(s, width);

  1005.                     lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0], width, lefty);

  1006.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1007.                         leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);

  1008.                         leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);

  1009.                     }

  1010.                     if (s->predictor == PLANE) {

  1011.                         if (cy > s->interlaced) {

  1012.                             s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);

  1013.                             if (!(s->flags & CODEC_FLAG_GRAY)) {

  1014.                                 s->hdsp.add_bytes(udst, udst - fake_ustride, width2);

  1015.                                 s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1016.                             }

  1017.                         }

  1018.                     }

  1019.                 }

  1020.                 draw_slice(s, p, height);

  1021. 

  1022.                 break;

  1023.             case MEDIAN:

  1024.                 /* first line except first 2 pixels is left predicted */

  1025.                 decode_422_bitstream(s, width - 2);

  1026.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0], width - 2, lefty);

  1027.                 if (!(s->flags & CODEC_FLAG_GRAY)) {

  1028.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);

  1029.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);

  1030.                 }

  1031. 

  1032.                 cy = y = 1;

  1033. 

  1034.                 /* second line is left predicted for interlaced case */

  1035.                 if (s->interlaced) {

  1036.                     decode_422_bitstream(s, width);

  1037.                     lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1038.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1039.                         leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1040.                         leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1041.                     }

  1042.                     y++; cy++;

  1043.                 }

  1044. 

  1045.                 /* next 4 pixels are left predicted too */

  1046.                 decode_422_bitstream(s, 4);

  1047.                 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

  1048.                 if (!(s->flags&CODEC_FLAG_GRAY)) {

  1049.                     leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1050.                     leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1051.                 }

  1052. 

  1053.                 /* next line except the first 4 pixels is median predicted */

  1054.                 lefttopy = p->data[0][3];

  1055.                 decode_422_bitstream(s, width - 4);

  1056.                 s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4, p->data[0] + 4, s->temp[0], width - 4, &lefty, &lefttopy);

  1057.                 if (!(s->flags&CODEC_FLAG_GRAY)) {

  1058.                     lefttopu = p->data[1][1];

  1059.                     lefttopv = p->data[2][1];

  1060.                     s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);

  1061.                     s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);

  1062.                 }

  1063.                 y++; cy++;

  1064. 

  1065.                 for (; y<height; y++, cy++) {

  1066.                     uint8_t *ydst, *udst, *vdst;

  1067. 

  1068.                     if (s->bitstream_bpp == 12) {

  1069.                         while (2 * cy > y) {

  1070.                             decode_gray_bitstream(s, width);

  1071.                             ydst = p->data[0] + p->linesize[0] * y;

  1072.                             s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1073.                             y++;

  1074.                         }

  1075.                         if (y >= height) break;

  1076.                     }

  1077.                     draw_slice(s, p, y);

  1078. 

  1079.                     decode_422_bitstream(s, width);

  1080. 

  1081.                     ydst = p->data[0] + p->linesize[0] * y;

  1082.                     udst = p->data[1] + p->linesize[1] * cy;

  1083.                     vdst = p->data[2] + p->linesize[2] * cy;

  1084. 

  1085.                     s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1086.                     if (!(s->flags & CODEC_FLAG_GRAY)) {

  1087.                         s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1088.                         s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1089.                     }

  1090.                 }

  1091. 

  1092.                 draw_slice(s, p, height);

  1093.                 break;

  1094.             }

  1095.         }

  1096.     } else {

  1097.         int y;

  1098.         uint8_t left[4];

  1099.         const int last_line = (height - 1) * p->linesize[0];

  1100. 

  1101.         if (s->bitstream_bpp == 32) {

  1102.             left[A] = p->data[0][last_line+A] = get_bits(&s->gb, 8);

  1103.             left[R] = p->data[0][last_line+R] = get_bits(&s->gb, 8);

  1104.             left[G] = p->data[0][last_line+G] = get_bits(&s->gb, 8);

  1105.             left[B] = p->data[0][last_line+B] = get_bits(&s->gb, 8);

  1106.         } else {

  1107.             left[R] = p->data[0][last_line+R] = get_bits(&s->gb, 8);

  1108.             left[G] = p->data[0][last_line+G] = get_bits(&s->gb, 8);

  1109.             left[B] = p->data[0][last_line+B] = get_bits(&s->gb, 8);

  1110.             left[A] = p->data[0][last_line+A] = 255;

  1111.             skip_bits(&s->gb, 8);

  1112.         }

  1113. 

  1114.         if (s->bgr32) {

  1115.             switch (s->predictor) {

  1116.             case LEFT:

  1117.             case PLANE:

  1118.                 decode_bgr_bitstream(s, width - 1);

  1119.                 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4, s->temp[0], width - 1, left);

  1120. 

  1121.                 for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.

  1122.                     decode_bgr_bitstream(s, width);

  1123. 

  1124.                     s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y, s->temp[0], width, left);

  1125.                     if (s->predictor == PLANE) {

  1126.                         if (s->bitstream_bpp != 32) left[A] = 0;

  1127.                         if ((y & s->interlaced) == 0 &&

  1128.                             y < s->height - 1 - s->interlaced) {

  1129.                             s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,

  1130.                                               p->data[0] + p->linesize[0] * y +

  1131.                                               fake_ystride, fake_ystride);

  1132.                         }

  1133.                     }

  1134.                 }

  1135.                 // just 1 large slice as this is not possible in reverse order

  1136.                 draw_slice(s, p, height);

  1137.                 break;

  1138.             default:

  1139.                 av_log(avctx, AV_LOG_ERROR,

  1140.                        "prediction type not supported!\n");

  1141.             }

  1142.         }else{

  1143.             av_log(avctx, AV_LOG_ERROR,

  1144.                    "BGR24 output is not implemented yet\n");

  1145.             return AVERROR_PATCHWELCOME;

  1146.         }

  1147.     }

  1148.     emms_c();

  1149. 

  1150.     *got_frame = 1;

  1151. 

  1152.     return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;

  1153. }

  1154. 

  1155. static av_cold int decode_end(AVCodecContext *avctx)

  1156. {

  1157.     HYuvContext *s = avctx->priv_data;

  1158.     int i;

  1159. 

  1160.     ff_huffyuv_common_end(s);

  1161.     av_freep(&s->bitstream_buffer);

  1162. 

  1163.     for (i = 0; i < 8; i++) {

  1164.         ff_free_vlc(&s->vlc[i]);

  1165.     }

  1166. 

  1167.     return 0;

  1168. }

  1169. 

  1170. AVCodec ff_huffyuv_decoder = {

  1171.     .name             = "huffyuv",

  1172.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1173.     .type             = AVMEDIA_TYPE_VIDEO,

  1174.     .id               = AV_CODEC_ID_HUFFYUV,

  1175.     .priv_data_size   = sizeof(HYuvContext),

  1176.     .init             = decode_init,

  1177.     .close            = decode_end,

  1178.     .decode           = decode_frame,

  1179.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  1180.                         CODEC_CAP_FRAME_THREADS,

  1181.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1182. };

  1183. 

  1184. #if CONFIG_FFVHUFF_DECODER

  1185. AVCodec ff_ffvhuff_decoder = {

  1186.     .name             = "ffvhuff",

  1187.     .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1188.     .type             = AVMEDIA_TYPE_VIDEO,

  1189.     .id               = AV_CODEC_ID_FFVHUFF,

  1190.     .priv_data_size   = sizeof(HYuvContext),

  1191.     .init             = decode_init,

  1192.     .close            = decode_end,

  1193.     .decode           = decode_frame,

  1194.     .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |

  1195.                         CODEC_CAP_FRAME_THREADS,

  1196.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1197. };

  1198. #endif