FFmpeg
iv8.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2009 Michael Niedermayer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avformat.h"
22 #include "internal.h"
23 
24 
25 static int probe(const AVProbeData *p)
26 {
27  // the single file I have starts with that, I do not know if others do, too
28  if( p->buf[0] == 1
29  && p->buf[1] == 1
30  && p->buf[2] == 3
31  && p->buf[3] == 0xB8
32  && p->buf[4] == 0x80
33  && p->buf[5] == 0x60
34  )
35  return AVPROBE_SCORE_MAX-2;
36 
37  return 0;
38 }
39 
41 {
42  AVStream *st;
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
51  avpriv_set_pts_info(st, 64, 1, 90000);
52 
53  return 0;
54 
55 }
56 
58 {
59  int ret, size, pts, type, flags;
60  int first_pkt = 0;
61  int frame_complete = 0;
62 
63  while (!frame_complete) {
64 
65  type = avio_rb16(s->pb); // 257 or 258
66  size = avio_rb16(s->pb);
67  flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame
68  avio_rb16(s->pb); //packet number
69  pts = avio_rb32(s->pb);
70  avio_rb32(s->pb); //6A 13 E3 88
71 
72  frame_complete = flags & 0x80;
73 
74  size -= 12;
75  if (size < 1)
76  return -1;
77 
78  if (type == 258) {
79  avio_skip(s->pb, size);
80  frame_complete = 0;
81  continue;
82  }
83 
84  if (!first_pkt) {
85  ret = av_get_packet(s->pb, pkt, size);
86  if (ret < 0)
87  return ret;
88  first_pkt = 1;
89  pkt->pts = pts;
90  pkt->pos -= 16;
91  } else {
92  ret = av_append_packet(s->pb, pkt, size);
93  if (ret < 0) {
94  av_log(s, AV_LOG_ERROR, "failed to grow packet\n");
95  return ret;
96  }
97  }
98  if (ret < size) {
99  av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n",
100  ret, size);
101  pkt->flags |= AV_PKT_FLAG_CORRUPT;
102  break;
103  }
104  }
105  pkt->stream_index = 0;
106 
107  return 0;
108 }
109 
111  .name = "iv8",
112  .long_name = NULL_IF_CONFIG_SMALL("IndigoVision 8000 video"),
113  .read_probe = probe,
114  .read_header = read_header,
115  .read_packet = read_packet,
116  .flags = AVFMT_GENERIC_INDEX,
117 };
#define NULL
Definition: coverity.c:32
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:383
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:4868
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
GLint GLenum type
Definition: opengl_enc.c:104
static int probe(const AVProbeData *p)
Definition: iv8.c:25
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:768
Format I/O context.
Definition: avformat.h:1355
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: iv8.c:57
static int read_header(AVFormatContext *s)
Definition: iv8.c:40
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:783
enum AVStreamParseType need_parsing
Definition: avformat.h:1098
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4449
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:305
ptrdiff_t size
Definition: opengl_enc.c:100
#define av_log(a,...)
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
Read data and append it to the current content of the AVPacket.
Definition: utils.c:315
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
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:369
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:880
AVIOContext * pb
I/O context.
Definition: avformat.h:1397
AVInputFormat ff_iv8_demuxer
Definition: iv8.c:110
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:560
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
full parsing and repack
Definition: avformat.h:799
Main libavformat public API header.
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:402
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:652
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1027
int stream_index
Definition: packet.h:365
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:340
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:356