| /* |
| * 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> |
| |
| #define YLC_VLC_BITS 10 |
| |
| #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" |
| #include "thread.h" |
| #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) { |
| bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1); |
| 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; |
| unsigned nd, st; |
| |
| 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; |
| if (nd >= UINT32_MAX - st) { |
| av_log(avctx, AV_LOG_ERROR, "count overflow\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| 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, YLC_VLC_BITS, 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; |
| ThreadFrame frame = { .f = data }; |
| 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; |
| |
| if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
| 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, YLC_VLC_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, YLC_VLC_BITS, 3); |
| u = get_vlc2(&gb, s->vlc[2].table, YLC_VLC_BITS, 3); |
| y2 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3); |
| v = get_vlc2(&gb, s->vlc[3].table, YLC_VLC_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; |
| } |
| |
| 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]); |
| av_freep(&s->table_bits); |
| s->table_bits_size = 0; |
| av_freep(&s->bitstream_bits); |
| s->bitstream_bits_size = 0; |
| |
| 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, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| }; |
