FFmpeg: libavformat/mods.c Source File
Go to the documentation of this file. 1 /*
2 * MODS demuxer
3 * Copyright (c) 2015-2016 Florian Nouwt
4 * Copyright (c) 2017 Adib Surani
5 * Copyright (c) 2020 Paul B Mahol
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
25
28
30 {
31 if (memcmp(p->
buf,
"MODSN3\x0a\x00", 8))
32 return 0;
34 return 0;
36 return 0;
38 return 0;
40 }
41
43 {
47
49 if (!st)
51
53
59
63
65
70
71 return 0;
72 }
73
75 {
80
83
90
92 }
93
100 .extensions = "mods",
102 };
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
#define AVERROR_EOF
End of file.
static int mods_read_header(AVFormatContext *s)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Rational number (pair of numerator and denominator).
This structure contains the data a format has to probe a file.
int64_t nb_frames
number of frames in this stream if known or 0
unsigned int avio_rl32(AVIOContext *s)
static int mods_probe(const AVProbeData *p)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
int flags
A combination of AV_PKT_FLAG values.
static int mods_read_packet(AVFormatContext *s, AVPacket *pkt)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
const AVInputFormat ff_mods_demuxer
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int64_t pos
byte position in stream, -1 if unknown
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Generated on Tue Feb 28 2023 21:34:06 for FFmpeg by
doxygen
1.8.17