1 /*
2 * Canopus common routines
3 * Copyright (c) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <stdint.h>
23
25
29
32 {
34 int par_x, par_y, field_order;
35
37
38 /* Parse aspect ratio. */
40 par_x = bytestream2_get_le32(&gbc);
41 par_y = bytestream2_get_le32(&gbc);
42 if (par_x && par_y)
45 par_x, par_y, 255);
46
47 /* Short INFO tag (used in CLLC) has only AR data. */
48 if (size == 0x18)
49 return 0;
50
52
53 /* Parse FIEL tag. */
55 field_order = bytestream2_get_le32(&gbc);
56 switch (field_order) {
60 }
61
62 return 0;
63 }
int ff_canopus_parse_info_tag(AVCodecContext *avctx, const uint8_t *src, size_t size)
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Libavcodec external API header.
main external API structure.
enum AVFieldOrder field_order
Field order.