Go to the documentation of this file.
1 /*
2  * Copyright (c) 2010 David Conrad
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
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  */
21 #include "avformat.h"
22 #include "internal.h"
23 #include "riff.h"
24 #include "libavutil/intreadwrite.h"
26 static int probe(const AVProbeData *p)
27 {
28  if (AV_RL32(p->buf) == MKTAG('D','K','I','F')
29  && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32)
30  return AVPROBE_SCORE_MAX-2;
32  return 0;
33 }
36 {
37  AVStream *st;
38  AVRational time_base;
40  avio_rl32(s->pb); // DKIF
41  avio_rl16(s->pb); // version
42  avio_rl16(s->pb); // header size
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
50  st->codecpar->codec_tag = avio_rl32(s->pb);
52  st->codecpar->width = avio_rl16(s->pb);
53  st->codecpar->height = avio_rl16(s->pb);
54  time_base.den = avio_rl32(s->pb);
55  time_base.num = avio_rl32(s->pb);
56  st->duration = avio_rl32(s->pb);
57  avio_skip(s->pb, 4); // unused
61  if (!time_base.den || !time_base.num) {
62  av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
64  }
66  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
68  return 0;
69 }
72 {
73  int ret, size = avio_rl32(s->pb);
74  int64_t pts = avio_rl64(s->pb);
76  ret = av_get_packet(s->pb, pkt, size);
77  pkt->stream_index = 0;
78  pkt->pts = pts;
79  pkt->pos -= 12;
81  return ret;
82 }
85  .name = "ivf",
86  .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
87  .read_probe = probe,
88  .read_header = read_header,
89  .read_packet = read_packet,
91  .codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
92 };
#define NULL
Definition: coverity.c:32
Invalid data found when processing input.
Definition: error.h:59
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3185
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
AVInputFormat ff_ivf_demuxer
Definition: ivfdec.c:84
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:91
Format I/O context.
Definition: avformat.h:1247
int width
Video only.
Definition: codec_par.h:126
enum AVStreamParseType need_parsing
Definition: avformat.h:1092
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
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
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
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
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
Only parse headers, do not repack.
Definition: avformat.h:804
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:33
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ivfdec.c:71
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
static int64_t pts
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:933
maximum score
Definition: avformat.h:453
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
Main libavformat public API header.
int den
Definition: rational.h:60
static int read_header(AVFormatContext *s)
Definition: ivfdec.c:35
static int probe(const AVProbeData *p)
Definition: ivfdec.c:26
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
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
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
#define MKTAG(a, b, c, d)
Definition: common.h:478
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
This structure stores compressed data.
Definition: packet.h:346
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:758
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362