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iv8.c
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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(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  av_packet_unref(pkt);
96  return ret;
97  }
98  }
99  if (ret < size) {
100  av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n",
101  ret, size);
102  pkt->flags |= AV_PKT_FLAG_CORRUPT;
103  break;
104  }
105  }
106  pkt->stream_index = 0;
107 
108  return 0;
109 }
110 
112  .name = "iv8",
113  .long_name = NULL_IF_CONFIG_SMALL("IndigoVision 8000 video"),
114  .read_probe = probe,
115  .read_header = read_header,
116  .read_packet = read_packet,
117  .flags = AVFMT_GENERIC_INDEX,
118 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1608
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:4493
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3939
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:736
Format I/O context.
Definition: avformat.h:1325
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:751
enum AVStreamParseType need_parsing
Definition: avformat.h:1063
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4131
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:260
ptrdiff_t size
Definition: opengl_enc.c:101
#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:270
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3935
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1594
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
Stream structure.
Definition: avformat.h:876
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
GLint GLenum type
Definition: opengl_enc.c:105
AVInputFormat ff_iv8_demuxer
Definition: iv8.c:111
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:485
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int64_t pts
Global timestamp for the audio frames.
static int flags
Definition: cpu.c:47
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
full parsing and repack
Definition: avformat.h:806
Main libavformat public API header.
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1621
static int probe(AVProbeData *p)
Definition: iv8.c:25
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
int stream_index
Definition: avcodec.h:1590
This structure stores compressed data.
Definition: avcodec.h:1565
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1581