huffyuvdec.c 46.3 KB
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/*
 * huffyuv decoder
 *
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 * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
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 *
 * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
 * the algorithm used
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
 * yuva, gray, 4:4:4, 4:1:1, 4:1:0 and >8 bit per sample support sponsored by NOA
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 */

/**
 * @file
 * huffyuv decoder
 */

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#define UNCHECKED_BITSTREAM_READER 1

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#include "avcodec.h"
#include "get_bits.h"
#include "huffyuv.h"
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#include "huffyuvdsp.h"
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#include "lossless_videodsp.h"
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#include "thread.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
43 44

#define classic_shift_luma_table_size 42
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static const unsigned char classic_shift_luma[classic_shift_luma_table_size + AV_INPUT_BUFFER_PADDING_SIZE] = {
46 47
    34, 36, 35, 69, 135, 232,   9, 16, 10, 24,  11,  23,  12,  16, 13, 10,
    14,  8, 15,  8,  16,   8,  17, 20, 16, 10, 207, 206, 205, 236, 11,  8,
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    10, 21,  9, 23,   8,   8, 199, 70, 69, 68,   0,
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  0,0,0,0,0,0,0,0,
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};

#define classic_shift_chroma_table_size 59
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static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + AV_INPUT_BUFFER_PADDING_SIZE] = {
54 55 56
    66, 36,  37,  38, 39, 40,  41,  75,  76,  77, 110, 239, 144, 81, 82,  83,
    84, 85, 118, 183, 56, 57,  88,  89,  56,  89, 154,  57,  58, 57, 26, 141,
    57, 56,  58,  57, 58, 57, 184, 119, 214, 245, 116,  83,  82, 49, 80,  79,
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    78, 77,  44,  75, 41, 40,  39,  38,  37,  36,  34,  0,
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  0,0,0,0,0,0,0,0,
59 60 61
};

static const unsigned char classic_add_luma[256] = {
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,
    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,
78 79 80
};

static const unsigned char classic_add_chroma[256] = {
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
     3,    1,   2,   2,   2,   2,   3,   3,   7,   5,   7,   5,   8,   6,  11,   9,
     7,   13,  11,  10,   9,   8,   7,   5,   9,   7,   6,   4,   7,   5,   8,   7,
     11,   8,  13,  11,  19,  15,  22,  23,  20,  33,  32,  28,  27,  29,  51,  77,
     43,  45,  76,  81,  46,  82,  75,  55,  56, 144,  58,  80,  60,  74, 147,  63,
    143,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
     80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  27,  30,  21,  22,
     17,  14,   5,   6, 100,  54,  47,  50,  51,  53, 106, 107, 108, 109, 110, 111,
    112, 113, 114, 115,   4, 117, 118,  92,  94, 121, 122,   3, 124, 103,   2,   1,
      0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,
    135, 132, 133, 104,  64, 101,  62,  57, 102,  95,  93,  59,  61,  28,  97,  96,
     52,  49,  48,  29,  32,  25,  24,  46,  23,  98,  45,  44,  43,  20,  42,  41,
     19,  18,  99,  40,  15,  39,  38,  16,  13,  12,  11,  37,  10,   9,   8,  36,
      7, 128, 127, 105, 123, 116,  35,  34,  33, 145,  31,  79,  42, 146,  78,  26,
     83,  48,  49,  50,  44,  47,  26,  31,  30,  18,  17,  19,  21,  24,  25,  13,
     14,  16,  17,  18,  20,  21,  12,  14,  15,   9,  10,   6,   9,   6,   5,   8,
      6,  12,   8,  10,   7,   9,   6,   4,   6,   2,   2,   3,   3,   3,   3,   2,
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};

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static int read_len_table(uint8_t *dst, GetBitContext *gb, int n)
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{
    int i, val, repeat;

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    for (i = 0; i < n;) {
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        repeat = get_bits(gb, 3);
        val    = get_bits(gb, 5);
        if (repeat == 0)
            repeat = get_bits(gb, 8);
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        if (i + repeat > n || get_bits_left(gb) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
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            return AVERROR_INVALIDDATA;
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        }
        while (repeat--)
            dst[i++] = val;
    }
    return 0;
}

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static int generate_joint_tables(HYuvContext *s)
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{
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    int ret;
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    uint16_t *symbols = av_mallocz(5 << VLC_BITS);
    uint16_t *bits;
    uint8_t *len;
    if (!symbols)
        return AVERROR(ENOMEM);
    bits = symbols + (1 << VLC_BITS);
    len = (uint8_t *)(bits + (1 << VLC_BITS));
128

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    if (s->bitstream_bpp < 24 || s->version > 2) {
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        int p, i, y, u;
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        for (p = 0; p < 4; p++) {
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            int p0 = s->version > 2 ? p : 0;
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            for (i = y = 0; y < s->vlc_n; y++) {
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                int len0  = s->len[p0][y];
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                int limit = VLC_BITS - len0;
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                if (limit <= 0 || !len0)
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                    continue;
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                if ((sign_extend(y, 8) & (s->vlc_n-1)) != y)
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                    continue;
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                for (u = 0; u < s->vlc_n; u++) {
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                    int len1 = s->len[p][u];
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                    if (len1 > limit || !len1)
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                        continue;
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                    if ((sign_extend(u, 8) & (s->vlc_n-1)) != u)
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                        continue;
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                    av_assert0(i < (1 << VLC_BITS));
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                    len[i]     = len0 + len1;
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                    bits[i]    = (s->bits[p0][y] << len1) + s->bits[p][u];
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                    symbols[i] = (y << 8) + (u & 0xFF);
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                        i++;
                }
            }
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            ff_free_vlc(&s->vlc[4 + p]);
            if ((ret = ff_init_vlc_sparse(&s->vlc[4 + p], VLC_BITS, i, len, 1, 1,
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                                          bits, 2, 2, symbols, 2, 2, 0)) < 0)
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                goto out;
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        }
    } else {
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        uint8_t (*map)[4] = (uint8_t(*)[4]) s->pix_bgr_map;
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        int i, b, g, r, code;
        int p0 = s->decorrelate;
        int p1 = !s->decorrelate;
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        /* Restrict the range to +/-16 because that's pretty much guaranteed
         * to cover all the combinations that fit in 11 bits total, and it
         *  does not matter if we miss a few rare codes. */
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        for (i = 0, g = -16; g < 16; g++) {
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            int len0   = s->len[p0][g & 255];
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            int limit0 = VLC_BITS - len0;
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            if (limit0 < 2 || !len0)
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                continue;
            for (b = -16; b < 16; b++) {
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                int len1   = s->len[p1][b & 255];
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                int limit1 = limit0 - len1;
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                if (limit1 < 1 || !len1)
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                    continue;
                code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
                for (r = -16; r < 16; r++) {
                    int len2 = s->len[2][r & 255];
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                    if (len2 > limit1 || !len2)
180
                        continue;
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                    av_assert0(i < (1 << VLC_BITS));
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                    len[i]  = len0 + len1 + len2;
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                    bits[i] = (code << len2) + s->bits[2][r & 255];
                    if (s->decorrelate) {
                        map[i][G] = g;
                        map[i][B] = g + b;
                        map[i][R] = g + r;
                    } else {
                        map[i][B] = g;
                        map[i][G] = b;
                        map[i][R] = r;
                    }
                    i++;
                }
            }
        }
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        ff_free_vlc(&s->vlc[4]);
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        if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1,
199
                            bits, 2, 2, 0)) < 0)
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            goto out;
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    }
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    ret = 0;
out:
    av_freep(&symbols);
    return ret;
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}

static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
{
    GetBitContext gb;
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    int i, ret;
212
    int count = 3;
213

214 215
    if ((ret = init_get_bits(&gb, src, length * 8)) < 0)
        return ret;
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217 218 219 220
    if (s->version > 2)
        count = 1 + s->alpha + 2*s->chroma;

    for (i = 0; i < count; i++) {
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        if ((ret = read_len_table(s->len[i], &gb, s->vlc_n)) < 0)
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            return ret;
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        if ((ret = ff_huffyuv_generate_bits_table(s->bits[i], s->len[i], s->vlc_n)) < 0)
224
            return ret;
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        ff_free_vlc(&s->vlc[i]);
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        if ((ret = init_vlc(&s->vlc[i], VLC_BITS, s->vlc_n, s->len[i], 1, 1,
227 228
                           s->bits[i], 4, 4, 0)) < 0)
            return ret;
229 230
    }

231 232
    if ((ret = generate_joint_tables(s)) < 0)
        return ret;
233 234 235 236 237 238 239

    return (get_bits_count(&gb) + 7) / 8;
}

static int read_old_huffman_tables(HYuvContext *s)
{
    GetBitContext gb;
240
    int i, ret;
241 242 243

    init_get_bits(&gb, classic_shift_luma,
                  classic_shift_luma_table_size * 8);
244
    if ((ret = read_len_table(s->len[0], &gb, 256)) < 0)
245
        return ret;
246 247 248

    init_get_bits(&gb, classic_shift_chroma,
                  classic_shift_chroma_table_size * 8);
249
    if ((ret = read_len_table(s->len[1], &gb, 256)) < 0)
250
        return ret;
251

252 253 254 255
    for (i = 0; i < 256; i++)
        s->bits[0][i] = classic_add_luma[i];
    for (i = 0; i < 256; i++)
        s->bits[1][i] = classic_add_chroma[i];
256 257 258

    if (s->bitstream_bpp >= 24) {
        memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
259
        memcpy(s->len[1], s->len[0], 256 * sizeof(uint8_t));
260 261
    }
    memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
262
    memcpy(s->len[2], s->len[1], 256 * sizeof(uint8_t));
263

264
    for (i = 0; i < 4; i++) {
265
        ff_free_vlc(&s->vlc[i]);
266 267 268
        if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
                            s->bits[i], 4, 4, 0)) < 0)
            return ret;
269 270
    }

271 272
    if ((ret = generate_joint_tables(s)) < 0)
        return ret;
273 274 275 276

    return 0;
}

277 278 279 280 281 282 283 284 285 286 287 288 289 290
static av_cold int decode_end(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
    int i;

    ff_huffyuv_common_end(s);
    av_freep(&s->bitstream_buffer);

    for (i = 0; i < 8; i++)
        ff_free_vlc(&s->vlc[i]);

    return 0;
}

291 292 293
static av_cold int decode_init(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
294
    int ret;
295

296 297 298 299
    ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
    if (ret < 0)
        return ret;

300
    ff_huffyuvdsp_init(&s->hdsp, avctx->pix_fmt);
301
    ff_llviddsp_init(&s->llviddsp);
302
    memset(s->vlc, 0, 4 * sizeof(VLC));
303

304
    s->interlaced = avctx->height > 288;
305
    s->bgr32      = 1;
306 307 308 309 310

    if (avctx->extradata_size) {
        if ((avctx->bits_per_coded_sample & 7) &&
            avctx->bits_per_coded_sample != 12)
            s->version = 1; // do such files exist at all?
311
        else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
312
            s->version = 2;
313 314
        else
            s->version = 3;
315 316 317
    } else
        s->version = 0;

318
    s->bps = 8;
319
    s->n = 1<<s->bps;
320
    s->vlc_n = FFMIN(s->n, MAX_VLC_N);
321 322
    s->chroma = 1;
    if (s->version >= 2) {
323 324 325
        int method, interlace;

        if (avctx->extradata_size < 4)
326
            return AVERROR_INVALIDDATA;
327

328
        method           = avctx->extradata[0];
329 330
        s->decorrelate   = method & 64 ? 1 : 0;
        s->predictor     = method & 63;
331
        if (s->version == 2) {
332
            s->bitstream_bpp = avctx->extradata[1];
333 334 335 336
            if (s->bitstream_bpp == 0)
                s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
        } else {
            s->bps = (avctx->extradata[1] >> 4) + 1;
337
            s->n = 1<<s->bps;
338
            s->vlc_n = FFMIN(s->n, MAX_VLC_N);
339 340
            s->chroma_h_shift = avctx->extradata[1] & 3;
            s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
341 342 343
            s->yuv   = !!(avctx->extradata[2] & 1);
            s->chroma= !!(avctx->extradata[2] & 3);
            s->alpha = !!(avctx->extradata[2] & 4);
344
        }
345
        interlace     = (avctx->extradata[2] & 0x30) >> 4;
346
        s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
347
        s->context    = avctx->extradata[2] & 0x40 ? 1 : 0;
348

349 350
        if ((ret = read_huffman_tables(s, avctx->extradata + 4,
                                       avctx->extradata_size - 4)) < 0)
351
            goto error;
352
    } else {
353 354
        switch (avctx->bits_per_coded_sample & 7) {
        case 1:
355
            s->predictor   = LEFT;
356 357 358
            s->decorrelate = 0;
            break;
        case 2:
359
            s->predictor   = LEFT;
360 361 362
            s->decorrelate = 1;
            break;
        case 3:
363
            s->predictor   = PLANE;
364 365 366
            s->decorrelate = avctx->bits_per_coded_sample >= 24;
            break;
        case 4:
367
            s->predictor   = MEDIAN;
368 369 370
            s->decorrelate = 0;
            break;
        default:
371
            s->predictor   = LEFT; // OLD
372 373 374 375
            s->decorrelate = 0;
            break;
        }
        s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
376
        s->context       = 0;
377

378
        if ((ret = read_old_huffman_tables(s)) < 0)
379
            goto error;
380 381
    }

382 383 384 385 386 387 388
    if (s->version <= 2) {
        switch (s->bitstream_bpp) {
        case 12:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P;
            s->yuv = 1;
            break;
        case 16:
389
            if (s->yuy2)
390
                avctx->pix_fmt = AV_PIX_FMT_YUYV422;
391
            else
392 393 394 395
                avctx->pix_fmt = AV_PIX_FMT_YUV422P;
            s->yuv = 1;
            break;
        case 24:
396
            if (s->bgr32)
397
                avctx->pix_fmt = AV_PIX_FMT_0RGB32;
398
            else
399 400
                avctx->pix_fmt = AV_PIX_FMT_BGR24;
            break;
401 402 403 404 405
        case 32:
            av_assert0(s->bgr32);
            avctx->pix_fmt = AV_PIX_FMT_RGB32;
            s->alpha = 1;
            break;
406
        default:
407 408
            ret = AVERROR_INVALIDDATA;
            goto error;
409
        }
410 411 412 413 414
        av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,
                                         &s->chroma_h_shift,
                                         &s->chroma_v_shift);
    } else {
        switch ( (s->chroma<<10) | (s->yuv<<9) | (s->alpha<<8) | ((s->bps-1)<<4) | s->chroma_h_shift | (s->chroma_v_shift<<2)) {
415 416 417
        case 0x070:
            avctx->pix_fmt = AV_PIX_FMT_GRAY8;
            break;
418 419 420
        case 0x0F0:
            avctx->pix_fmt = AV_PIX_FMT_GRAY16;
            break;
421 422 423
        case 0x170:
            avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
            break;
424 425 426
        case 0x470:
            avctx->pix_fmt = AV_PIX_FMT_GBRP;
            break;
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
        case 0x480:
            avctx->pix_fmt = AV_PIX_FMT_GBRP9;
            break;
        case 0x490:
            avctx->pix_fmt = AV_PIX_FMT_GBRP10;
            break;
        case 0x4B0:
            avctx->pix_fmt = AV_PIX_FMT_GBRP12;
            break;
        case 0x4D0:
            avctx->pix_fmt = AV_PIX_FMT_GBRP14;
            break;
        case 0x4F0:
            avctx->pix_fmt = AV_PIX_FMT_GBRP16;
            break;
442 443 444
        case 0x570:
            avctx->pix_fmt = AV_PIX_FMT_GBRAP;
            break;
445 446 447
        case 0x670:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P;
            break;
448 449 450 451 452 453 454 455 456 457 458 459
        case 0x680:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
            break;
        case 0x690:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
            break;
        case 0x6B0:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
            break;
        case 0x6D0:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P14;
            break;
460 461 462
        case 0x6F0:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
            break;
463 464 465
        case 0x671:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P;
            break;
466 467 468 469 470 471 472 473 474 475 476 477
        case 0x681:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
            break;
        case 0x691:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
            break;
        case 0x6B1:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
            break;
        case 0x6D1:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P14;
            break;
478 479 480
        case 0x6F1:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
            break;
481 482 483 484 485 486 487 488 489
        case 0x672:
            avctx->pix_fmt = AV_PIX_FMT_YUV411P;
            break;
        case 0x674:
            avctx->pix_fmt = AV_PIX_FMT_YUV440P;
            break;
        case 0x675:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P;
            break;
490 491 492
        case 0x685:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
            break;
493 494 495
        case 0x695:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
            break;
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        case 0x6B5:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
            break;
        case 0x6D5:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P14;
            break;
502 503 504
        case 0x6F5:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
            break;
505 506 507
        case 0x67A:
            avctx->pix_fmt = AV_PIX_FMT_YUV410P;
            break;
508 509 510
        case 0x770:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
            break;
511 512 513 514 515 516
        case 0x780:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;
            break;
        case 0x790:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;
            break;
517 518 519
        case 0x7F0:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
            break;
520 521 522
        case 0x771:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
            break;
523 524 525 526 527 528
        case 0x781:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;
            break;
        case 0x791:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;
            break;
529 530 531
        case 0x7F1:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
            break;
532 533 534
        case 0x775:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
            break;
535 536 537
        case 0x785:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;
            break;
538 539 540
        case 0x795:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;
            break;
541 542 543
        case 0x7F5:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
            break;
544
        default:
545 546
            ret = AVERROR_INVALIDDATA;
            goto error;
547 548 549
        }
    }

550
    ff_huffyuv_common_init(avctx);
551

552 553
    if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {
        av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");
554 555
        ret = AVERROR_INVALIDDATA;
        goto error;
556
    }
557 558
    if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P &&
        avctx->width % 4) {
559
        av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 "
560
               "for this combination of colorspace and predictor type.\n");
561 562
        ret = AVERROR_INVALIDDATA;
        goto error;
563
    }
564

565
    if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
566
        ff_huffyuv_common_end(s);
567
        goto error;
568
    }
569 570

    return 0;
571 572 573
  error:
    decode_end(avctx);
    return ret;
574 575
}

576
#if HAVE_THREADS
577 578 579
static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
580
    int i, ret;
581

582 583
    s->avctx = avctx;

584
    if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
585
        ff_huffyuv_common_end(s);
586
        return ret;
587
    }
588

589
    for (i = 0; i < 8; i++)
590 591
        s->vlc[i].table = NULL;

592
    if (s->version >= 2) {
593 594 595
        if ((ret = read_huffman_tables(s, avctx->extradata + 4,
                                       avctx->extradata_size)) < 0)
            return ret;
596
    } else {
597 598
        if ((ret = read_old_huffman_tables(s)) < 0)
            return ret;
599 600 601 602
    }

    return 0;
}
603
#endif
604

605 606
/** Subset of GET_VLC for use in hand-roller VLC code */
#define VLC_INTERN(dst, table, gb, name, bits, max_depth)   \
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631
    code = table[index][0];                                 \
    n    = table[index][1];                                 \
    if (max_depth > 1 && n < 0) {                           \
        LAST_SKIP_BITS(name, gb, bits);                     \
        UPDATE_CACHE(name, gb);                             \
                                                            \
        nb_bits = -n;                                       \
        index   = SHOW_UBITS(name, gb, nb_bits) + code;     \
        code    = table[index][0];                          \
        n       = table[index][1];                          \
        if (max_depth > 2 && n < 0) {                       \
            LAST_SKIP_BITS(name, gb, nb_bits);              \
            UPDATE_CACHE(name, gb);                         \
                                                            \
            nb_bits = -n;                                   \
            index   = SHOW_UBITS(name, gb, nb_bits) + code; \
            code    = table[index][0];                      \
            n       = table[index][1];                      \
        }                                                   \
    }                                                       \
    dst = code;                                             \
    LAST_SKIP_BITS(name, gb, n)


#define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2,  \
632
                     bits, max_depth, OP)                           \
633 634
    do {                                                            \
        unsigned int index = SHOW_UBITS(name, gb, bits);            \
635
        int          code, n = dtable[index][1];                    \
636
                                                                    \
637
        if (n<=0) {                                                 \
638
            int nb_bits;                                            \
639
            VLC_INTERN(dst0, table1, gb, name, bits, max_depth);    \
640 641 642
                                                                    \
            UPDATE_CACHE(re, gb);                                   \
            index = SHOW_UBITS(name, gb, bits);                     \
643
            VLC_INTERN(dst1, table2, gb, name, bits, max_depth);    \
644 645 646 647
        } else {                                                    \
            code = dtable[index][0];                                \
            OP(dst0, dst1, code);                                   \
            LAST_SKIP_BITS(name, gb, n);                            \
648 649 650
        }                                                           \
    } while (0)

651 652
#define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code

653
#define READ_2PIX(dst0, dst1, plane1)                                   \
654 655
    UPDATE_CACHE(re, &s->gb);                                           \
    GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table,        \
656
                 s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)
657 658 659

static void decode_422_bitstream(HYuvContext *s, int count)
{
660
    int i, icount;
661
    OPEN_READER(re, &s->gb);
662 663
    count /= 2;

664 665 666
    icount = get_bits_left(&s->gb) / (32 * 4);
    if (count >= icount) {
        for (i = 0; i < icount; i++) {
667
            READ_2PIX(s->temp[0][2 * i],     s->temp[1][i], 1);
668 669
            READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
        }
670
        for (; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
671
            READ_2PIX(s->temp[0][2 * i    ], s->temp[1][i], 1);
672
            if (BITS_LEFT(re, &s->gb) <= 0) break;
673 674
            READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
        }
675 676
        for (; i < count; i++)
            s->temp[0][2 * i    ] = s->temp[1][i] =
677
            s->temp[0][2 * i + 1] = s->temp[2][i] = 0;
678 679
    } else {
        for (i = 0; i < count; i++) {
680
            READ_2PIX(s->temp[0][2 * i],     s->temp[1][i], 1);
681 682 683
            READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
        }
    }
684
    CLOSE_READER(re, &s->gb);
685 686
}

687
#define READ_2PIX_PLANE(dst0, dst1, plane, OP) \
688 689
    UPDATE_CACHE(re, &s->gb); \
    GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
690 691 692
                 s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)

#define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8)
693

694 695
/* TODO instead of restarting the read when the code isn't in the first level
 * of the joint table, jump into the 2nd level of the individual table. */
696 697 698 699 700 701
#define READ_2PIX_PLANE16(dst0, dst1, plane){\
    dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
    dst0 += get_bits(&s->gb, 2);\
    dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
    dst1 += get_bits(&s->gb, 2);\
}
702
static void decode_plane_bitstream(HYuvContext *s, int width, int plane)
703
{
704
    int i, count = width/2;
705

706
    if (s->bps <= 8) {
707
        OPEN_READER(re, &s->gb);
708
        if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
709
            for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
710
                READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
711 712 713
            }
        } else {
            for(i=0; i<count; i++){
714
                READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
715
            }
716
        }
717 718 719 720 721 722 723 724
        if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
            unsigned int index;
            int nb_bits, code, n;
            UPDATE_CACHE(re, &s->gb);
            index = SHOW_UBITS(re, &s->gb, VLC_BITS);
            VLC_INTERN(s->temp[0][width-1], s->vlc[plane].table,
                       &s->gb, re, VLC_BITS, 3);
        }
725
        CLOSE_READER(re, &s->gb);
726
    } else if (s->bps <= 14) {
727
        OPEN_READER(re, &s->gb);
728
        if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
729
            for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
730
                READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
731 732 733
            }
        } else {
            for(i=0; i<count; i++){
734
                READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
735 736
            }
        }
737 738 739 740 741 742 743 744
        if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
            unsigned int index;
            int nb_bits, code, n;
            UPDATE_CACHE(re, &s->gb);
            index = SHOW_UBITS(re, &s->gb, VLC_BITS);
            VLC_INTERN(s->temp16[0][width-1], s->vlc[plane].table,
                       &s->gb, re, VLC_BITS, 3);
        }
745
        CLOSE_READER(re, &s->gb);
746
    } else {
747
        if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
748 749 750 751 752 753 754
            for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
                READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
            }
        } else {
            for(i=0; i<count; i++){
                READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
            }
755
        }
756 757 758 759
        if( width&1 && get_bits_left(&s->gb)>0 ) {
            int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
            s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);
        }
760 761 762
    }
}

763 764 765
static void decode_gray_bitstream(HYuvContext *s, int count)
{
    int i;
766
    OPEN_READER(re, &s->gb);
767
    count /= 2;
768

769
    if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
770
        for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
771 772 773
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    } else {
774
        for (i = 0; i < count; i++) {
775 776 777
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    }
778
    CLOSE_READER(re, &s->gb);
779 780 781 782 783 784
}

static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
                                          int decorrelate, int alpha)
{
    int i;
785 786
    OPEN_READER(re, &s->gb);

787
    for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
788
        unsigned int index;
789
        int code, n, nb_bits;
790 791 792 793 794

        UPDATE_CACHE(re, &s->gb);
        index = SHOW_UBITS(re, &s->gb, VLC_BITS);
        n     = s->vlc[4].table[index][1];

795 796
        if (n>0) {
            code  = s->vlc[4].table[index][0];
797
            *(uint32_t *) &s->temp[0][4 * i] = s->pix_bgr_map[code];
798
            LAST_SKIP_BITS(re, &s->gb, n);
799
        } else {
800
            if (decorrelate) {
801 802
                VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
                           &s->gb, re, VLC_BITS, 3);
803 804 805

                UPDATE_CACHE(re, &s->gb);
                index = SHOW_UBITS(re, &s->gb, VLC_BITS);
806
                VLC_INTERN(code, s->vlc[0].table, &s->gb, re, VLC_BITS, 3);
807 808 809 810
                s->temp[0][4 * i + B] = code + s->temp[0][4 * i + G];

                UPDATE_CACHE(re, &s->gb);
                index = SHOW_UBITS(re, &s->gb, VLC_BITS);
811
                VLC_INTERN(code, s->vlc[2].table, &s->gb, re, VLC_BITS, 3);
812 813
                s->temp[0][4 * i + R] = code + s->temp[0][4 * i + G];
            } else {
814 815
                VLC_INTERN(s->temp[0][4 * i + B], s->vlc[0].table,
                           &s->gb, re, VLC_BITS, 3);
816 817 818

                UPDATE_CACHE(re, &s->gb);
                index = SHOW_UBITS(re, &s->gb, VLC_BITS);
819 820
                VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
                           &s->gb, re, VLC_BITS, 3);
821 822 823

                UPDATE_CACHE(re, &s->gb);
                index = SHOW_UBITS(re, &s->gb, VLC_BITS);
824 825
                VLC_INTERN(s->temp[0][4 * i + R], s->vlc[2].table,
                           &s->gb, re, VLC_BITS, 3);
826
            }
827
        }
828 829 830 831 832 833 834
        if (alpha) {
            UPDATE_CACHE(re, &s->gb);
            index = SHOW_UBITS(re, &s->gb, VLC_BITS);
            VLC_INTERN(s->temp[0][4 * i + A], s->vlc[2].table,
                       &s->gb, re, VLC_BITS, 3);
        } else
            s->temp[0][4 * i + A] = 0;
835
    }
836
    CLOSE_READER(re, &s->gb);
837 838 839 840 841
}

static void decode_bgr_bitstream(HYuvContext *s, int count)
{
    if (s->decorrelate) {
842
        if (s->bitstream_bpp == 24)
843 844 845 846
            decode_bgr_1(s, count, 1, 0);
        else
            decode_bgr_1(s, count, 1, 1);
    } else {
847
        if (s->bitstream_bpp == 24)
848 849 850 851 852 853
            decode_bgr_1(s, count, 0, 0);
        else
            decode_bgr_1(s, count, 0, 1);
    }
}

854
static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
855 856 857 858
{
    int h, cy, i;
    int offset[AV_NUM_DATA_POINTERS];

859
    if (!s->avctx->draw_horiz_band)
860 861
        return;

862
    h  = y - s->last_slice_end;
863 864
    y -= h;

865 866 867
    if (s->bitstream_bpp == 12)
        cy = y >> 1;
    else
868 869
        cy = y;

870 871 872
    offset[0] = frame->linesize[0] * y;
    offset[1] = frame->linesize[1] * cy;
    offset[2] = frame->linesize[2] * cy;
873 874 875 876
    for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
        offset[i] = 0;
    emms_c();

877
    s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
878 879 880 881

    s->last_slice_end = y + h;
}

882 883 884
static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
{
    if (s->bps <= 8) {
885
        return s->llviddsp.add_left_pred(dst, src, w, acc);
886
    } else {
887
        return s->llviddsp.add_left_pred_int16((      uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);
888 889 890 891 892 893
    }
}

static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
{
    if (s->bps <= 8) {
894
        s->llviddsp.add_bytes(dst, src, w);
895
    } else {
896
        s->hdsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);
897 898 899
    }
}

900 901 902
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)
{
    if (s->bps <= 8) {
903
        s->llviddsp.add_median_pred(dst, src, diff, w, left, left_top);
904
    } else {
905
        s->hdsp.add_hfyu_median_pred_int16((uint16_t *)dst, (const uint16_t *)src, (const uint16_t *)diff, s->n-1, w, left, left_top);
906 907
    }
}
908 909 910 911
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
912
    int buf_size       = avpkt->size;
913
    HYuvContext *s = avctx->priv_data;
914 915
    const int width  = s->width;
    const int width2 = s->width >> 1;
916 917
    const int height = s->height;
    int fake_ystride, fake_ustride, fake_vstride;
918
    ThreadFrame frame = { .f = data };
919
    AVFrame *const p = data;
920
    int table_size = 0, ret;
921

922
    av_fast_padded_malloc(&s->bitstream_buffer,
923
                   &s->bitstream_buffer_size,
924
                   buf_size);
925 926 927
    if (!s->bitstream_buffer)
        return AVERROR(ENOMEM);

928 929
    s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
                      (const uint32_t *) buf, buf_size / 4);
930

931
    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
932
        return ret;
933 934 935 936

    if (s->context) {
        table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
        if (table_size < 0)
937
            return table_size;
938 939
    }

940
    if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)
941
        return AVERROR_INVALIDDATA;
942

943 944 945
    if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,
                             (buf_size - table_size) * 8)) < 0)
        return ret;
946

947 948 949
    fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
    fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
    fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
950 951 952

    s->last_slice_end = 0;

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
    if (s->version > 2) {
        int plane;
        for(plane = 0; plane < 1 + 2*s->chroma + s->alpha; plane++) {
            int left, lefttop, y;
            int w = width;
            int h = height;
            int fake_stride = fake_ystride;

            if (s->chroma && (plane == 1 || plane == 2)) {
                w >>= s->chroma_h_shift;
                h >>= s->chroma_v_shift;
                fake_stride = plane == 1 ? fake_ustride : fake_vstride;
            }

            switch (s->predictor) {
            case LEFT:
            case PLANE:
                decode_plane_bitstream(s, w, plane);
971
                left = left_prediction(s, p->data[plane], s->temp[0], w, 0);
972 973 974 975 976

                for (y = 1; y < h; y++) {
                    uint8_t *dst = p->data[plane] + p->linesize[plane]*y;

                    decode_plane_bitstream(s, w, plane);
977
                    left = left_prediction(s, dst, s->temp[0], w, left);
978 979
                    if (s->predictor == PLANE) {
                        if (y > s->interlaced) {
980
                            add_bytes(s, dst, dst - fake_stride, w);
981 982 983 984 985 986 987
                        }
                    }
                }

                break;
            case MEDIAN:
                decode_plane_bitstream(s, w, plane);
988
                left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
989 990 991 992 993 994

                y = 1;

                /* second line is left predicted for interlaced case */
                if (s->interlaced) {
                    decode_plane_bitstream(s, w, plane);
995
                    left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
996 997 998 999 1000
                    y++;
                }

                lefttop = p->data[plane][0];
                decode_plane_bitstream(s, w, plane);
1001
                add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);
1002 1003 1004 1005 1006 1007 1008 1009 1010
                y++;

                for (; y<h; y++) {
                    uint8_t *dst;

                    decode_plane_bitstream(s, w, plane);

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

1011
                    add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);
1012 1013 1014 1015 1016 1017 1018
                }

                break;
            }
        }
        draw_slice(s, p, height);
    } else if (s->bitstream_bpp < 24) {
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
        int y, cy;
        int lefty, leftu, leftv;
        int lefttopy, lefttopu, lefttopv;

        if (s->yuy2) {
            p->data[0][3] = get_bits(&s->gb, 8);
            p->data[0][2] = get_bits(&s->gb, 8);
            p->data[0][1] = get_bits(&s->gb, 8);
            p->data[0][0] = get_bits(&s->gb, 8);

            av_log(avctx, AV_LOG_ERROR,
                   "YUY2 output is not implemented yet\n");
1031
            return AVERROR_PATCHWELCOME;
1032
        } else {
1033 1034 1035 1036 1037 1038 1039
            leftv         =
            p->data[2][0] = get_bits(&s->gb, 8);
            lefty         =
            p->data[0][1] = get_bits(&s->gb, 8);
            leftu         =
            p->data[1][0] = get_bits(&s->gb, 8);
            p->data[0][0] = get_bits(&s->gb, 8);
1040 1041 1042 1043

            switch (s->predictor) {
            case LEFT:
            case PLANE:
1044
                decode_422_bitstream(s, width - 2);
1045
                lefty = s->llviddsp.add_left_pred(p->data[0] + 2, s->temp[0],
1046
                                                   width - 2, lefty);
1047
                if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1048 1049
                    leftu = s->llviddsp.add_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
                    leftv = s->llviddsp.add_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
                }

                for (cy = y = 1; y < s->height; y++, cy++) {
                    uint8_t *ydst, *udst, *vdst;

                    if (s->bitstream_bpp == 12) {
                        decode_gray_bitstream(s, width);

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

1060
                        lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],
1061
                                                           width, lefty);
1062 1063
                        if (s->predictor == PLANE) {
                            if (y > s->interlaced)
1064
                                s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);
1065 1066
                        }
                        y++;
1067 1068
                        if (y >= s->height)
                            break;
1069 1070
                    }

1071
                    draw_slice(s, p, y);
1072

1073 1074 1075
                    ydst = p->data[0] + p->linesize[0] * y;
                    udst = p->data[1] + p->linesize[1] * cy;
                    vdst = p->data[2] + p->linesize[2] * cy;
1076 1077

                    decode_422_bitstream(s, width);
1078
                    lefty = s->llviddsp.add_left_pred(ydst, s->temp[0],
1079
                                                       width, lefty);
1080
                    if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1081 1082
                        leftu = s->llviddsp.add_left_pred(udst, s->temp[1], width2, leftu);
                        leftv = s->llviddsp.add_left_pred(vdst, s->temp[2], width2, leftv);
1083 1084 1085
                    }
                    if (s->predictor == PLANE) {
                        if (cy > s->interlaced) {
1086
                            s->llviddsp.add_bytes(ydst, ydst - fake_ystride, width);
1087
                            if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1088 1089
                                s->llviddsp.add_bytes(udst, udst - fake_ustride, width2);
                                s->llviddsp.add_bytes(vdst, vdst - fake_vstride, width2);
1090 1091 1092 1093
                            }
                        }
                    }
                }
1094
                draw_slice(s, p, height);
1095 1096 1097 1098 1099

                break;
            case MEDIAN:
                /* first line except first 2 pixels is left predicted */
                decode_422_bitstream(s, width - 2);
1100
                lefty = s->llviddsp.add_left_pred(p->data[0] + 2, s->temp[0],
1101
                                                   width - 2, lefty);
1102
                if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1103 1104
                    leftu = s->llviddsp.add_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
                    leftv = s->llviddsp.add_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1105 1106 1107 1108 1109 1110 1111
                }

                cy = y = 1;

                /* second line is left predicted for interlaced case */
                if (s->interlaced) {
                    decode_422_bitstream(s, width);
1112
                    lefty = s->llviddsp.add_left_pred(p->data[0] + p->linesize[0],
1113
                                                       s->temp[0], width, lefty);
1114
                    if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1115 1116
                        leftu = s->llviddsp.add_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
                        leftv = s->llviddsp.add_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
1117
                    }
1118 1119
                    y++;
                    cy++;
1120 1121 1122 1123
                }

                /* next 4 pixels are left predicted too */
                decode_422_bitstream(s, 4);
1124
                lefty = s->llviddsp.add_left_pred(p->data[0] + fake_ystride,
1125
                                                   s->temp[0], 4, lefty);
1126
                if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1127 1128
                    leftu = s->llviddsp.add_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
                    leftv = s->llviddsp.add_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
1129 1130 1131 1132 1133
                }

                /* next line except the first 4 pixels is median predicted */
                lefttopy = p->data[0][3];
                decode_422_bitstream(s, width - 4);
1134
                s->llviddsp.add_median_pred(p->data[0] + fake_ystride + 4,
1135 1136
                                             p->data[0] + 4, s->temp[0],
                                             width - 4, &lefty, &lefttopy);
1137
                if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1138 1139
                    lefttopu = p->data[1][1];
                    lefttopv = p->data[2][1];
1140 1141
                    s->llviddsp.add_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
                    s->llviddsp.add_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
1142
                }
1143 1144
                y++;
                cy++;
1145

1146
                for (; y < height; y++, cy++) {
1147 1148 1149 1150 1151 1152
                    uint8_t *ydst, *udst, *vdst;

                    if (s->bitstream_bpp == 12) {
                        while (2 * cy > y) {
                            decode_gray_bitstream(s, width);
                            ydst = p->data[0] + p->linesize[0] * y;
1153
                            s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,
1154 1155
                                                         s->temp[0], width,
                                                         &lefty, &lefttopy);
1156 1157
                            y++;
                        }
1158 1159
                        if (y >= height)
                            break;
1160
                    }
1161
                    draw_slice(s, p, y);
1162 1163 1164 1165 1166 1167 1168

                    decode_422_bitstream(s, width);

                    ydst = p->data[0] + p->linesize[0] * y;
                    udst = p->data[1] + p->linesize[1] * cy;
                    vdst = p->data[2] + p->linesize[2] * cy;

1169
                    s->llviddsp.add_median_pred(ydst, ydst - fake_ystride,
1170 1171
                                                 s->temp[0], width,
                                                 &lefty, &lefttopy);
1172
                    if (!(s->flags & AV_CODEC_FLAG_GRAY)) {
1173 1174
                        s->llviddsp.add_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
                        s->llviddsp.add_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
1175 1176 1177
                    }
                }

1178
                draw_slice(s, p, height);
1179 1180 1181 1182 1183
                break;
            }
        }
    } else {
        int y;
1184
        uint8_t left[4];
1185 1186 1187
        const int last_line = (height - 1) * p->linesize[0];

        if (s->bitstream_bpp == 32) {
1188 1189 1190 1191
            left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);
            left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
            left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
            left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
1192
        } else {
1193 1194 1195 1196
            left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
            left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
            left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
            left[A] = p->data[0][last_line + A] = 255;
1197 1198 1199 1200 1201 1202 1203 1204
            skip_bits(&s->gb, 8);
        }

        if (s->bgr32) {
            switch (s->predictor) {
            case LEFT:
            case PLANE:
                decode_bgr_bitstream(s, width - 1);
1205
                s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,
1206
                                                 s->temp[0], width - 1, left);
1207

1208
                for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.
1209 1210
                    decode_bgr_bitstream(s, width);

1211
                    s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,
1212
                                                     s->temp[0], width, left);
1213
                    if (s->predictor == PLANE) {
1214
                        if (s->bitstream_bpp != 32)
1215
                            left[A] = 0;
1216
                        if (y < s->height - 1 - s->interlaced) {
1217
                            s->llviddsp.add_bytes(p->data[0] + p->linesize[0] * y,
1218
                                              p->data[0] + p->linesize[0] * y +
1219
                                              fake_ystride, 4 * width);
1220 1221 1222 1223
                        }
                    }
                }
                // just 1 large slice as this is not possible in reverse order
1224
                draw_slice(s, p, height);
1225 1226 1227 1228 1229
                break;
            default:
                av_log(avctx, AV_LOG_ERROR,
                       "prediction type not supported!\n");
            }
1230
        } else {
1231 1232
            av_log(avctx, AV_LOG_ERROR,
                   "BGR24 output is not implemented yet\n");
1233
            return AVERROR_PATCHWELCOME;
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
        }
    }
    emms_c();

    *got_frame = 1;

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

AVCodec ff_huffyuv_decoder = {
    .name             = "huffyuv",
1245
    .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
1246 1247 1248 1249 1250 1251
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_HUFFYUV,
    .priv_data_size   = sizeof(HYuvContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
1252 1253
    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                        AV_CODEC_CAP_FRAME_THREADS,
1254 1255 1256 1257 1258 1259
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
};

#if CONFIG_FFVHUFF_DECODER
AVCodec ff_ffvhuff_decoder = {
    .name             = "ffvhuff",
1260
    .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
1261 1262 1263 1264 1265 1266
    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_FFVHUFF,
    .priv_data_size   = sizeof(HYuvContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
1267 1268
    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DRAW_HORIZ_BAND |
                        AV_CODEC_CAP_FRAME_THREADS,
1269 1270
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
};
1271
#endif /* CONFIG_FFVHUFF_DECODER */