libavcodec/ylc.c
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 /*
  * YUY2 Lossless Codec
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * 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.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * 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
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "libavutil/imgutils.h"
 #include "libavutil/internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/mem.h"
 #include "avcodec.h"
 #include "bswapdsp.h"
 #include "get_bits.h"
 #include "huffyuvdsp.h"
 #include "internal.h"
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 #include "thread.h"
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 #include "unary.h"
 
 typedef struct YLCContext {
     VLC vlc[4];
     uint32_t table[1024];
     uint8_t *table_bits;
     uint8_t *bitstream_bits;
     int table_bits_size;
     int bitstream_bits_size;
     BswapDSPContext bdsp;
 } YLCContext;
 
 static av_cold int decode_init(AVCodecContext *avctx)
 {
     YLCContext *s = avctx->priv_data;
 
     avctx->pix_fmt = AV_PIX_FMT_YUYV422;
     ff_bswapdsp_init(&s->bdsp);
 
     return 0;
 }
 
 typedef struct Node {
     int16_t  sym;
     int16_t  n0;
     uint32_t count;
     int16_t  l, r;
 } Node;
 
 static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
                            Node *nodes, int node,
                            uint32_t pfx, int pl, int *pos)
 {
     int s;
 
     s = nodes[node].sym;
     if (s != -1) {
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         bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
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         lens[*pos] = FFMAX(pl, 1);
         xlat[*pos] = s + (pl == 0);
         (*pos)++;
     } else {
         pfx <<= 1;
         pl++;
         get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
                        pos);
         pfx |= 1;
         get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
                        pos);
     }
 }
 
 static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
 {
     Node nodes[512];
     uint32_t bits[256];
     int16_t lens[256];
     uint8_t xlat[256];
     int cur_node, i, j, pos = 0;
 
     ff_free_vlc(vlc);
 
     for (i = 0; i < 256; i++) {
         nodes[i].count = table[i];
         nodes[i].sym   = i;
         nodes[i].n0    = -2;
         nodes[i].l     = i;
         nodes[i].r     = i;
     }
 
     cur_node = 256;
     j = 0;
     do {
         for (i = 0; ; i++) {
             int new_node = j;
             int first_node = cur_node;
             int second_node = cur_node;
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             unsigned nd, st;
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             nodes[cur_node].count = -1;
 
             do {
                 int val = nodes[new_node].count;
                 if (val && (val < nodes[first_node].count)) {
                     if (val >= nodes[second_node].count) {
                         first_node = new_node;
                     } else {
                         first_node = second_node;
                         second_node = new_node;
                     }
                 }
                 new_node += 1;
             } while (new_node != cur_node);
 
             if (first_node == cur_node)
                 break;
 
             nd = nodes[second_node].count;
             st = nodes[first_node].count;
             nodes[second_node].count = 0;
             nodes[first_node].count  = 0;
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             if (nd >= UINT32_MAX - st) {
                 av_log(avctx, AV_LOG_ERROR, "count overflow\n");
                 return AVERROR_INVALIDDATA;
             }
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             nodes[cur_node].count = nd + st;
             nodes[cur_node].sym = -1;
             nodes[cur_node].n0 = cur_node;
             nodes[cur_node].l = first_node;
             nodes[cur_node].r = second_node;
             cur_node++;
         }
         j++;
     } while (cur_node - 256 == j);
 
     get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
 
     return ff_init_vlc_sparse(vlc, 10, pos, lens, 2, 2, bits, 4, 4, xlat, 1, 1, 0);
 }
 
 static const uint8_t table_y1[] = {
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
     0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
     0x02, 0x00,
 };
 
 static const uint8_t table_u[] = {
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
     0x01, 0x00,
 };
 
 static const uint8_t table_y2[] = {
     0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
     0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
     0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
     0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
     0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
     0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
     0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
     0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
     0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
     0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
     0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
     0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
     0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
     0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
     0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
     0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
     0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
     0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
     0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
     0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
     0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
     0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
     0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
     0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
     0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
     0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
     0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
     0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
     0x04, 0x00,
 };
 
 static const uint8_t table_v[] = {
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
     0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
     0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
     0x01, 0x00,
 };
 
 static int decode_frame(AVCodecContext *avctx,
                         void *data, int *got_frame,
                         AVPacket *avpkt)
 {
     int TL[4] = { 128, 128, 128, 128 };
     int L[4]  = { 128, 128, 128, 128 };
     YLCContext *s = avctx->priv_data;
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     ThreadFrame frame = { .f = data };
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     const uint8_t *buf = avpkt->data;
     int ret, x, y, toffset, boffset;
     AVFrame * const p = data;
     GetBitContext gb;
     uint8_t *dst;
 
     if (avpkt->size <= 16)
         return AVERROR_INVALIDDATA;
 
     if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
         AV_RL32(buf + 4) != 0)
         return AVERROR_INVALIDDATA;
 
     toffset = AV_RL32(buf + 8);
     if (toffset < 16 || toffset >= avpkt->size)
         return AVERROR_INVALIDDATA;
 
     boffset = AV_RL32(buf + 12);
     if (toffset >= boffset || boffset >= avpkt->size)
         return AVERROR_INVALIDDATA;
 
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     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
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         return ret;
 
     av_fast_malloc(&s->table_bits, &s->table_bits_size,
                    boffset - toffset + AV_INPUT_BUFFER_PADDING_SIZE);
     if (!s->table_bits)
         return AVERROR(ENOMEM);
 
     memcpy(s->table_bits, avpkt->data + toffset, boffset - toffset);
     memset(s->table_bits + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
     s->bdsp.bswap_buf((uint32_t *) s->table_bits,
                       (uint32_t *) s->table_bits,
                       (boffset - toffset + 3) >> 2);
     if ((ret = init_get_bits8(&gb, s->table_bits, boffset - toffset)) < 0)
         return ret;
 
     for (x = 0; x < 1024; x++) {
         unsigned len = get_unary(&gb, 1, 31);
         uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
 
         s->table[x] = val;
     }
 
     ret = build_vlc(avctx, &s->vlc[0], &s->table[0  ]);
     if (ret < 0)
         return ret;
     ret = build_vlc(avctx, &s->vlc[1], &s->table[256]);
     if (ret < 0)
         return ret;
     ret = build_vlc(avctx, &s->vlc[2], &s->table[512]);
     if (ret < 0)
         return ret;
     ret = build_vlc(avctx, &s->vlc[3], &s->table[768]);
     if (ret < 0)
         return ret;
 
     av_fast_malloc(&s->bitstream_bits, &s->bitstream_bits_size,
                    avpkt->size - boffset + AV_INPUT_BUFFER_PADDING_SIZE);
     if (!s->bitstream_bits)
         return AVERROR(ENOMEM);
 
     memcpy(s->bitstream_bits, avpkt->data + boffset, avpkt->size - boffset);
     memset(s->bitstream_bits + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
     s->bdsp.bswap_buf((uint32_t *) s->bitstream_bits,
                       (uint32_t *) s->bitstream_bits,
                       (avpkt->size - boffset) >> 2);
     if ((ret = init_get_bits8(&gb, s->bitstream_bits, avpkt->size - boffset)) < 0)
         return ret;
 
     dst = p->data[0];
     for (y = 0; y < avctx->height; y++) {
         memset(dst, 0, avctx->width * 2);
         dst += p->linesize[0];
     }
 
     dst = p->data[0];
     for (y = 0; y < avctx->height; y++) {
         for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
             if (get_bits_left(&gb) <= 0)
                 return AVERROR_INVALIDDATA;
 
             if (get_bits1(&gb)) {
                 int val = get_vlc2(&gb, s->vlc[0].table, s->vlc[0].bits, 3);
                 if (val < 0) {
                     return AVERROR_INVALIDDATA;
                 } else if (val < 0xE1) {
                     dst[x    ] = table_y1[val];
                     dst[x + 1] = table_u[val];
                     dst[x + 2] = table_y2[val];
                     dst[x + 3] = table_v[val];
                     x += 4;
                 } else {
                     int incr = (val - 0xDF) * 4;
                     if (x + incr >= avctx->width * 2) {
                         int iy = ((x + incr) / (avctx->width * 2));
                         x  = (x + incr) % (avctx->width * 2);
                         y += iy;
                         dst += iy * p->linesize[0];
                     } else {
                         x += incr;
                     }
                 }
             } else {
                 int y1, y2, u, v;
 
                 y1 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
                 u  = get_vlc2(&gb, s->vlc[2].table, s->vlc[2].bits, 3);
                 y2 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
                 v  = get_vlc2(&gb, s->vlc[3].table, s->vlc[3].bits, 3);
                 if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
                     return AVERROR_INVALIDDATA;
                 dst[x    ] = y1;
                 dst[x + 1] = u;
                 dst[x + 2] = y1 + y2;
                 dst[x + 3] = v;
                 x += 4;
             }
         }
         dst += p->linesize[0];
     }
 
     dst = p->data[0];
     for (x = 0; x < avctx->width * 2; x += 4) {
         dst[x    ] =        dst[x    ] + L[0];
         dst[x + 2] = L[0] = dst[x + 2] + L[0];
         L[1] = dst[x + 1] + L[1];
         dst[x + 1] = L[1];
         L[2] = dst[x + 3] + L[2];
         dst[x + 3] = L[2];
     }
     dst += p->linesize[0];
 
     for (y = 1; y < avctx->height; y++) {
         x = 0;
         dst[x    ] =        dst[x    ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
         dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
         TL[0] = dst[x + 2 - p->linesize[0]];
         L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
         dst[x + 1] = L[1];
         TL[1] = dst[x + 1 - p->linesize[0]];
         L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
         dst[x + 3] = L[2];
         TL[2] = dst[x + 3 - p->linesize[0]];
         for (x = 4; x < avctx->width * 2; x += 4) {
             dst[x    ] =        dst[x    ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
             dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
             TL[0] = dst[x + 2 - p->linesize[0]];
             L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
             dst[x + 1] = L[1];
             TL[1] = dst[x + 1 - p->linesize[0]];
             L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
             dst[x + 3] = L[2];
             TL[2] = dst[x + 3 - p->linesize[0]];
         }
         dst += p->linesize[0];
     }
 
     p->pict_type = AV_PICTURE_TYPE_I;
     p->key_frame = 1;
     *got_frame   = 1;
 
     return avpkt->size;
 }
 
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 #if HAVE_THREADS
 static int init_thread_copy(AVCodecContext *avctx)
 {
     YLCContext *s = avctx->priv_data;
 
     memset(&s->vlc[0], 0, sizeof(VLC));
     memset(&s->vlc[1], 0, sizeof(VLC));
     memset(&s->vlc[2], 0, sizeof(VLC));
     memset(&s->vlc[3], 0, sizeof(VLC));
     s->table_bits = NULL;
     s->table_bits_size = 0;
     s->bitstream_bits = NULL;
     s->bitstream_bits_size = 0;
 
     return 0;
 }
 #endif
 
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 static av_cold int decode_end(AVCodecContext *avctx)
 {
     YLCContext *s = avctx->priv_data;
 
     ff_free_vlc(&s->vlc[0]);
     ff_free_vlc(&s->vlc[1]);
     ff_free_vlc(&s->vlc[2]);
     ff_free_vlc(&s->vlc[3]);
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     av_freep(&s->table_bits);
     s->table_bits_size = 0;
     av_freep(&s->bitstream_bits);
     s->bitstream_bits_size = 0;
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     return 0;
 }
 
 AVCodec ff_ylc_decoder = {
     .name           = "ylc",
     .long_name      = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_YLC,
     .priv_data_size = sizeof(YLCContext),
     .init           = decode_init,
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     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
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     .close          = decode_end,
     .decode         = decode_frame,
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     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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 };