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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
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  */
24 #include "libavutil/intreadwrite.h"
26 #include "avformat.h"
27 #include "internal.h"
29 static int mods_probe(const AVProbeData *p)
30 {
31  if (memcmp(p->buf, "MODSN3\x0a\x00", 8))
32  return 0;
33  if (AV_RB32(p->buf + 8) == 0)
34  return 0;
35  if (AV_RB32(p->buf + 12) == 0)
36  return 0;
37  if (AV_RB32(p->buf + 16) == 0)
38  return 0;
40 }
43 {
44  AVIOContext *pb = s->pb;
45  AVRational fps;
46  int64_t pos;
49  if (!st)
50  return AVERROR(ENOMEM);
52  avio_skip(pb, 8);
54  st->nb_frames = avio_rl32(pb);
57  st->codecpar->width = avio_rl32(pb);
58  st->codecpar->height = avio_rl32(pb);
60  fps.num = avio_rl32(pb);
61  fps.den = 0x1000000;
62  avpriv_set_pts_info(st, 64, fps.den, fps.num);
64  avio_skip(pb, 16);
66  pos = avio_rl32(pb) + 4;
67  avio_seek(pb, pos, SEEK_SET);
68  pos = avio_rl32(pb);
69  avio_seek(pb, pos, SEEK_SET);
71  return 0;
72 }
75 {
76  AVIOContext *pb = s->pb;
77  unsigned size;
78  int64_t pos;
79  int ret;
81  if (avio_feof(pb))
82  return AVERROR_EOF;
84  pos = avio_tell(pb);
85  size = avio_rl32(pb) >> 14;
86  ret = av_get_packet(pb, pkt, size);
87  pkt->pos = pos;
88  pkt->stream_index = 0;
89  pkt->flags |= AV_PKT_FLAG_KEY;
91  return ret;
92 }
95  .name = "mods",
96  .long_name = NULL_IF_CONFIG_SMALL("MobiClip MODS"),
97  .read_probe = mods_probe,
98  .read_header = mods_read_header,
99  .read_packet = mods_read_packet,
100  .extensions = "mods",
101  .flags = AVFMT_GENERIC_INDEX,
102 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4999
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Definition: rational.h:59
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVPacket * pkt
Definition: movenc.c:59
Format I/O context.
Definition: avformat.h:1247
int width
Video only.
Definition: codec_par.h:126
static int mods_read_header(AVFormatContext *s)
Definition: mods.c:42
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
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
Definition: bytestream.h:91
static int mods_probe(const AVProbeData *p)
Definition: mods.c:29
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
The packet contains a keyframe.
Definition: packet.h:410
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
unsigned int pos
Definition: spdifenc.c:412
static int mods_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mods.c:74
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:884
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
Use generic index building code.
Definition: avformat.h:463
Rational number (pair of numerator and denominator).
Definition: rational.h:58
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
maximum score
Definition: avformat.h:453
Main libavformat public API header.
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:935
int den
Definition: rational.h:60
AVInputFormat ff_mods_demuxer
Definition: mods.c:94
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
int stream_index
Definition: packet.h:371
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
This structure stores compressed data.
Definition: packet.h:346