huffyuvdec.c 39.7 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
 */

#include "avcodec.h"
#include "get_bits.h"
#include "huffyuv.h"
#include "thread.h"
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#include "libavutil/pixdesc.h"
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#define classic_shift_luma_table_size 42
static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
  34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
  16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
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  69,68, 0,
  0,0,0,0,0,0,0,0,
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};

#define classic_shift_chroma_table_size 59
static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
  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,
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  214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0,
  0,0,0,0,0,0,0,0,
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};

static const unsigned char classic_add_luma[256] = {
    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,
};

static const unsigned char classic_add_chroma[256] = {
    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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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");
            return -1;
        }
        while (repeat--)
            dst[i++] = val;
    }
    return 0;
}

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static int generate_joint_tables(HYuvContext *s)
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{
    uint16_t symbols[1 << VLC_BITS];
    uint16_t bits[1 << VLC_BITS];
    uint8_t len[1 << VLC_BITS];
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    int ret;

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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)
                    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)
                        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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                    if(symbols[i] != 0xffff) // reserved to mean "invalid"
                        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)
                return ret;
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        }
    } else {
        uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
        int i, b, g, r, code;
        int p0 = s->decorrelate;
        int p1 = !s->decorrelate;
        // restrict the range to +/-16 because that's pretty much guaranteed to
        // cover all the combinations that fit in 11 bits total, and it doesn't
        // matter if we miss a few rare codes.
        for (i = 0, g = -16; g < 16; g++) {
            int len0 = s->len[p0][g & 255];
            int limit0 = VLC_BITS - len0;
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            if (limit0 < 2 || !len0)
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                continue;
            for (b = -16; b < 16; b++) {
                int len1 = s->len[p1][b & 255];
                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)
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                        continue;
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                    av_assert0(i < (1 << VLC_BITS));
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                    len[i] = len0 + len1 + len2;
                    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]);
        if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0)) < 0)
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            return ret;
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    }
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    return 0;
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}

static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
{
    GetBitContext gb;
    int i;
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    int ret;
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    int count = 3;
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    init_get_bits(&gb, src, length * 8);

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    if (s->version > 2)
        count = 1 + s->alpha + 2*s->chroma;

    for (i = 0; i < count; i++) {
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        if (read_len_table(s->len[i], &gb, s->vlc_n) < 0)
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            return -1;
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        if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i], s->vlc_n) < 0) {
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            return -1;
        }
        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,
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                           s->bits[i], 4, 4, 0)) < 0)
            return ret;
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    }

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    if ((ret = generate_joint_tables(s)) < 0)
        return ret;
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    return (get_bits_count(&gb) + 7) / 8;
}

static int read_old_huffman_tables(HYuvContext *s)
{
    GetBitContext gb;
    int i;
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    int ret;
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    init_get_bits(&gb, classic_shift_luma,
                  classic_shift_luma_table_size * 8);
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    if (read_len_table(s->len[0], &gb, 256) < 0)
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        return -1;

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

    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];

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

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

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    if ((ret = generate_joint_tables(s)) < 0)
        return ret;
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    return 0;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;

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    memset(s->vlc, 0, 4 * sizeof(VLC));
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    s->interlaced = avctx->height > 288;
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    s->bgr32 = 1;

    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?
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        else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
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            s->version = 2;
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        else
            s->version = 3;
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    } else
        s->version = 0;

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    s->bps = 8;
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    s->n = 1<<s->bps;
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    s->vlc_n = FFMIN(s->n, MAX_VLC_N);
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    s->chroma = 1;
    if (s->version >= 2) {
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        int method, interlace;

        if (avctx->extradata_size < 4)
            return -1;

        method = ((uint8_t*)avctx->extradata)[0];
        s->decorrelate = method & 64 ? 1 : 0;
        s->predictor = method & 63;
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        if (s->version == 2) {
            s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
            if (s->bitstream_bpp == 0)
                s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
        } else {
            s->bps = (avctx->extradata[1] >> 4) + 1;
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            s->n = 1<<s->bps;
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            s->vlc_n = FFMIN(s->n, MAX_VLC_N);
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            s->chroma_h_shift = avctx->extradata[1] & 3;
            s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
            s->yuv   = !!(((uint8_t*)avctx->extradata)[2] & 1);
            s->chroma= !!(((uint8_t*)avctx->extradata)[2] & 3);
            s->alpha = !!(((uint8_t*)avctx->extradata)[2] & 4);
        }
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        interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
        s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
        s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;

        if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
                                 avctx->extradata_size - 4) < 0)
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            return AVERROR_INVALIDDATA;
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    }else{
        switch (avctx->bits_per_coded_sample & 7) {
        case 1:
            s->predictor = LEFT;
            s->decorrelate = 0;
            break;
        case 2:
            s->predictor = LEFT;
            s->decorrelate = 1;
            break;
        case 3:
            s->predictor = PLANE;
            s->decorrelate = avctx->bits_per_coded_sample >= 24;
            break;
        case 4:
            s->predictor = MEDIAN;
            s->decorrelate = 0;
            break;
        default:
            s->predictor = LEFT; //OLD
            s->decorrelate = 0;
            break;
        }
        s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
        s->context = 0;

        if (read_old_huffman_tables(s) < 0)
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            return AVERROR_INVALIDDATA;
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    }

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    if (s->version <= 2) {
        switch (s->bitstream_bpp) {
        case 12:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P;
            s->yuv = 1;
            break;
        case 16:
            if (s->yuy2) {
                avctx->pix_fmt = AV_PIX_FMT_YUYV422;
            } else {
                avctx->pix_fmt = AV_PIX_FMT_YUV422P;
            }
            s->yuv = 1;
            break;
        case 24:
            if (s->bgr32) {
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                avctx->pix_fmt = AV_PIX_FMT_0RGB32;
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            } else {
                avctx->pix_fmt = AV_PIX_FMT_BGR24;
            }
            break;
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        case 32:
            av_assert0(s->bgr32);
            avctx->pix_fmt = AV_PIX_FMT_RGB32;
            s->alpha = 1;
            break;
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        default:
            return AVERROR_INVALIDDATA;
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        }
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        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)) {
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        case 0x070:
            avctx->pix_fmt = AV_PIX_FMT_GRAY8;
            break;
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        case 0x0F0:
            avctx->pix_fmt = AV_PIX_FMT_GRAY16;
            break;
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        case 0x170:
            avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
            break;
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        case 0x470:
            avctx->pix_fmt = AV_PIX_FMT_GBRP;
            break;
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        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;
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        case 0x570:
            avctx->pix_fmt = AV_PIX_FMT_GBRAP;
            break;
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        case 0x670:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P;
            break;
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        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;
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        case 0x6F0:
            avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
            break;
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        case 0x671:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P;
            break;
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        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;
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        case 0x6F1:
            avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
            break;
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        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;
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        case 0x685:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
            break;
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        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;
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        case 0x6F5:
            avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
            break;
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        case 0x67A:
            avctx->pix_fmt = AV_PIX_FMT_YUV410P;
            break;
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        case 0x770:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
            break;
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        case 0x780:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;
            break;
        case 0x790:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;
            break;
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        case 0x7F0:
            avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
            break;
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        case 0x771:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
            break;
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        case 0x781:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;
            break;
        case 0x791:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;
            break;
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        case 0x7F1:
            avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
            break;
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        case 0x775:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
            break;
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        case 0x785:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;
            break;
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        case 0x795:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;
            break;
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        case 0x7F5:
            avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
            break;
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        default:
            return AVERROR_INVALIDDATA;
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        }
    }

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    ff_huffyuv_common_init(avctx);
518

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    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");
        return AVERROR_INVALIDDATA;
    }
    if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P && avctx->width%4) {
        av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 this colorspace and predictor\n");
        return AVERROR_INVALIDDATA;
    }
    if (ff_huffyuv_alloc_temp(s)) {
        ff_huffyuv_common_end(s);
        return AVERROR(ENOMEM);
    }
531 532 533 534 535 536 537 538 539

    return 0;
}

static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
    int i;

540 541 542 543
    if (ff_huffyuv_alloc_temp(s)) {
        ff_huffyuv_common_end(s);
        return AVERROR(ENOMEM);
    }
544

545
    for (i = 0; i < 8; i++)
546 547
        s->vlc[i].table = NULL;

548
    if (s->version >= 2) {
549 550
        if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
                                avctx->extradata_size) < 0)
551
            return AVERROR_INVALIDDATA;
552 553
    } else {
        if (read_old_huffman_tables(s) < 0)
554
            return AVERROR_INVALIDDATA;
555 556 557 558 559 560 561 562
    }

    return 0;
}

/* 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. */
#define READ_2PIX(dst0, dst1, plane1){\
563
    uint16_t code = get_vlc2(&s->gb, s->vlc[4+plane1].table, VLC_BITS, 1);\
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583
    if(code != 0xffff){\
        dst0 = code>>8;\
        dst1 = code;\
    }else{\
        dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
        dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
    }\
}

static void decode_422_bitstream(HYuvContext *s, int count)
{
    int i;

    count /= 2;

    if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
        for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
            READ_2PIX(s->temp[0][2 * i    ], s->temp[1][i], 1);
            READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
        }
584 585 586
        for (; i < count; i++)
            s->temp[0][2 * i    ] = s->temp[1][i] =
            s->temp[0][2 * i + 1] = s->temp[2][i] = 128;
587 588 589 590 591 592 593 594
    } else {
        for (i = 0; i < count; i++) {
            READ_2PIX(s->temp[0][2 * i    ], s->temp[1][i], 1);
            READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
        }
    }
}

595
#define READ_2PIX_PLANE(dst0, dst1, plane){\
596
    uint16_t code = get_vlc2(&s->gb, s->vlc[4+plane].table, VLC_BITS, 1);\
597 598 599 600 601 602 603 604
    if(code != 0xffff){\
        dst0 = code>>8;\
        dst1 = code;\
    }else{\
        dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
        dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
    }\
}
605
#define READ_2PIX_PLANE14(dst0, dst1, plane){\
606 607 608 609 610 611 612 613
    int16_t code = get_vlc2(&s->gb, s->vlc[4+plane].table, VLC_BITS, 1);\
    if(code != (int16_t)0xffff){\
        dst0 = code>>8;\
        dst1 = sign_extend(code, 8);\
    }else{\
        dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
        dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3);\
    }\
614
}
615 616 617 618 619 620 621

#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);\
}
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static void decode_plane_bitstream(HYuvContext *s, int count, int plane)
{
    int i;

    count/=2;

628 629 630 631 632 633 634 635 636
    if (s->bps <= 8) {
        if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
            for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
                READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane);
            }
        } else {
            for(i=0; i<count; i++){
                READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane);
            }
637
        }
638 639 640 641 642 643 644 645 646 647
    } else if (s->bps <= 14) {
        if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
            for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
                READ_2PIX_PLANE14(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
            }
        } else {
            for(i=0; i<count; i++){
                READ_2PIX_PLANE14(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
            }
        }
648
    } else {
649 650 651 652 653 654 655 656
        if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
            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);
            }
657 658 659 660
        }
    }
}

661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
static void decode_gray_bitstream(HYuvContext *s, int count)
{
    int i;

    count/=2;

    if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
        for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    } else {
        for(i=0; i<count; i++){
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    }
}

static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
                                          int decorrelate, int alpha)
{
    int i;
    for (i = 0; i < count; i++) {
683
        int code = get_vlc2(&s->gb, s->vlc[4].table, VLC_BITS, 1);
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
        if (code != -1) {
            *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
        } else if(decorrelate) {
            s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
            s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
                                    s->temp[0][4 * i + G];
            s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
                                    s->temp[0][4 * i + G];
        } else {
            s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
            s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
            s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
        }
        if (alpha)
            s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
    }
}

static void decode_bgr_bitstream(HYuvContext *s, int count)
{
    if (s->decorrelate) {
        if (s->bitstream_bpp==24)
            decode_bgr_1(s, count, 1, 0);
        else
            decode_bgr_1(s, count, 1, 1);
    } else {
        if (s->bitstream_bpp==24)
            decode_bgr_1(s, count, 0, 0);
        else
            decode_bgr_1(s, count, 0, 1);
    }
}

717
static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
{
    int h, cy, i;
    int offset[AV_NUM_DATA_POINTERS];

    if (s->avctx->draw_horiz_band==NULL)
        return;

    h = y - s->last_slice_end;
    y -= h;

    if (s->bitstream_bpp == 12) {
        cy = y>>1;
    } else {
        cy = y;
    }

734 735 736
    offset[0] = frame->linesize[0] * y;
    offset[1] = frame->linesize[1] * cy;
    offset[2] = frame->linesize[2] * cy;
737 738 739 740
    for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
        offset[i] = 0;
    emms_c();

741
    s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
742 743 744 745

    s->last_slice_end = y + h;
}

746 747 748 749 750
static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
{
    if (s->bps <= 8) {
        return s->dsp.add_hfyu_left_prediction(dst, src, w, acc);
    } else {
751
        return s->llviddsp.add_hfyu_left_prediction_int16((      uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);
752 753 754 755 756 757 758 759
    }
}

static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
{
    if (s->bps <= 8) {
        s->dsp.add_bytes(dst, src, w);
    } else {
760
        s->llviddsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);
761 762 763
    }
}

764 765 766 767 768
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) {
        s->dsp.add_hfyu_median_prediction(dst, src, diff, w, left, left_top);
    } else {
769
        s->llviddsp.add_hfyu_median_prediction_int16((uint16_t *)dst, (const uint16_t *)src, (const uint16_t *)diff, s->n-1, w, left, left_top);
770 771
    }
}
772 773 774 775 776 777 778 779 780 781
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    HYuvContext *s = avctx->priv_data;
    const int width = s->width;
    const int width2 = s->width>>1;
    const int height = s->height;
    int fake_ystride, fake_ustride, fake_vstride;
782 783
    ThreadFrame frame = { .f = data };
    AVFrame * const p = data;
784
    int table_size = 0, ret;
785

786
    av_fast_padded_malloc(&s->bitstream_buffer,
787
                   &s->bitstream_buffer_size,
788
                   buf_size);
789 790 791 792 793 794
    if (!s->bitstream_buffer)
        return AVERROR(ENOMEM);

    s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
                     (const uint32_t*)buf, buf_size / 4);

795
    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
796
        return ret;
797 798 799 800

    if (s->context) {
        table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
        if (table_size < 0)
801
            return AVERROR_INVALIDDATA;
802 803 804
    }

    if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
805
        return AVERROR_INVALIDDATA;
806 807 808 809 810 811 812 813 814 815

    init_get_bits(&s->gb, s->bitstream_buffer+table_size,
                  (buf_size-table_size) * 8);

    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];

    s->last_slice_end = 0;

816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
    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);
834
                left = left_prediction(s, p->data[plane], s->temp[0], w, 0);
835 836 837 838 839

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

                    decode_plane_bitstream(s, w, plane);
840
                    left = left_prediction(s, dst, s->temp[0], w, left);
841 842
                    if (s->predictor == PLANE) {
                        if (y > s->interlaced) {
843
                            add_bytes(s, dst, dst - fake_stride, w);
844 845 846 847 848 849 850
                        }
                    }
                }

                break;
            case MEDIAN:
                decode_plane_bitstream(s, w, plane);
851
                left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
852 853 854 855 856 857

                y = 1;

                /* second line is left predicted for interlaced case */
                if (s->interlaced) {
                    decode_plane_bitstream(s, w, plane);
858
                    left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
859 860 861 862 863
                    y++;
                }

                lefttop = p->data[plane][0];
                decode_plane_bitstream(s, w, plane);
864
                add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);
865 866 867 868 869 870 871 872 873
                y++;

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

                    decode_plane_bitstream(s, w, plane);

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

874
                    add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);
875 876 877 878 879 880 881
                }

                break;
            }
        }
        draw_slice(s, p, height);
    } else if (s->bitstream_bpp < 24) {
882 883 884 885 886 887 888 889 890 891 892 893
        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");
894
            return AVERROR_PATCHWELCOME;
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
        } else {

            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);

            switch (s->predictor) {
            case LEFT:
            case PLANE:
                decode_422_bitstream(s, width-2);
                lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
                if (!(s->flags&CODEC_FLAG_GRAY)) {
                    leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
                    leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
                }

                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;

                        lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
                        if (s->predictor == PLANE) {
                            if (y > s->interlaced)
                                s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
                        }
                        y++;
                        if (y >= s->height) break;
                    }

929
                    draw_slice(s, p, y);
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950

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

                    decode_422_bitstream(s, width);
                    lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
                    if (!(s->flags & CODEC_FLAG_GRAY)) {
                        leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
                        leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
                    }
                    if (s->predictor == PLANE) {
                        if (cy > s->interlaced) {
                            s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
                            if (!(s->flags & CODEC_FLAG_GRAY)) {
                                s->dsp.add_bytes(udst, udst - fake_ustride, width2);
                                s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
                            }
                        }
                    }
                }
951
                draw_slice(s, p, height);
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

                break;
            case MEDIAN:
                /* first line except first 2 pixels is left predicted */
                decode_422_bitstream(s, width - 2);
                lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
                if (!(s->flags & CODEC_FLAG_GRAY)) {
                    leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
                    leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
                }

                cy = y = 1;

                /* second line is left predicted for interlaced case */
                if (s->interlaced) {
                    decode_422_bitstream(s, width);
                    lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
                    if (!(s->flags & CODEC_FLAG_GRAY)) {
                        leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
                        leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
                    }
                    y++; cy++;
                }

                /* next 4 pixels are left predicted too */
                decode_422_bitstream(s, 4);
                lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
                if (!(s->flags&CODEC_FLAG_GRAY)) {
                    leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
                    leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
                }

                /* next line except the first 4 pixels is median predicted */
                lefttopy = p->data[0][3];
                decode_422_bitstream(s, width - 4);
                s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
                if (!(s->flags&CODEC_FLAG_GRAY)) {
                    lefttopu = p->data[1][1];
                    lefttopv = p->data[2][1];
                    s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
                    s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
                }
                y++; cy++;

                for (; y<height; y++, cy++) {
                    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;
                            s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
                            y++;
                        }
                        if (y >= height) break;
                    }
1008
                    draw_slice(s, p, y);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022

                    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;

                    s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
                    if (!(s->flags & CODEC_FLAG_GRAY)) {
                        s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
                        s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
                    }
                }

1023
                draw_slice(s, p, height);
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                break;
            }
        }
    } else {
        int y;
        int leftr, leftg, leftb, lefta;
        const int last_line = (height - 1) * p->linesize[0];

        if (s->bitstream_bpp == 32) {
            lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
            leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
            leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
            leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
        } else {
            leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
            leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
            leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
            lefta = p->data[0][last_line+A] = 255;
            skip_bits(&s->gb, 8);
        }

        if (s->bgr32) {
            switch (s->predictor) {
            case LEFT:
            case PLANE:
                decode_bgr_bitstream(s, width - 1);
                s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);

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

                    s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
                    if (s->predictor == PLANE) {
                        if (s->bitstream_bpp != 32) lefta = 0;
                        if ((y & s->interlaced) == 0 &&
                            y < s->height - 1 - s->interlaced) {
                            s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
                                             p->data[0] + p->linesize[0] * y +
                                             fake_ystride, fake_ystride);
                        }
                    }
                }
                // just 1 large slice as this is not possible in reverse order
1067
                draw_slice(s, p, height);
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                break;
            default:
                av_log(avctx, AV_LOG_ERROR,
                       "prediction type not supported!\n");
            }
        }else{
            av_log(avctx, AV_LOG_ERROR,
                   "BGR24 output is not implemented yet\n");
1076
            return AVERROR_PATCHWELCOME;
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        }
    }
    emms_c();

    *got_frame = 1;

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

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);

1094
    for (i = 0; i < 8; i++) {
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        ff_free_vlc(&s->vlc[i]);
    }

    return 0;
}

AVCodec ff_huffyuv_decoder = {
    .name             = "huffyuv",
1103
    .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
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    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_HUFFYUV,
    .priv_data_size   = sizeof(HYuvContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
    .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
                        CODEC_CAP_FRAME_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
};

#if CONFIG_FFVHUFF_DECODER
AVCodec ff_ffvhuff_decoder = {
    .name             = "ffvhuff",
1118
    .long_name        = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
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    .type             = AVMEDIA_TYPE_VIDEO,
    .id               = AV_CODEC_ID_FFVHUFF,
    .priv_data_size   = sizeof(HYuvContext),
    .init             = decode_init,
    .close            = decode_end,
    .decode           = decode_frame,
    .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
                        CODEC_CAP_FRAME_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
};
#endif