1 /*
2 * Generic TTML helpers
3 * Copyright (c) 2021 24i
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 #ifndef AVFORMAT_TTMLENC_H
23 #define AVFORMAT_TTMLENC_H
24
25 #include "libavcodec/codec_par.h"
26 #include "libavcodec/ttmlenc.h"
27
ff_is_ttml_stream_paragraph_based(const AVCodecParameters *codecpar)28 static inline unsigned int ff_is_ttml_stream_paragraph_based(const AVCodecParameters *codecpar)
29 {
30 // Not perfect, but decide whether the packet is a document or not
31 // by the existence of the lavc ttmlenc extradata.
32 return (codecpar->extradata &&
33 codecpar->extradata_size >= TTMLENC_EXTRADATA_SIGNATURE_SIZE &&
34 !memcmp(codecpar->extradata,
35 TTMLENC_EXTRADATA_SIGNATURE,
36 TTMLENC_EXTRADATA_SIGNATURE_SIZE));
37 }
38
39 #endif /* AVFORMAT_TTMLENC_H */
40