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ivfdec.c
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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
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 #include "riff.h"
24 #include "libavutil/intreadwrite.h"
25 
26 static int probe(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;
31 
32  return 0;
33 }
34 
36 {
37  AVStream *st;
38  AVRational time_base;
39 
40  avio_rl32(s->pb); // DKIF
41  avio_rl16(s->pb); // version
42  avio_rl16(s->pb); // header size
43 
44  st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
48 
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_rl64(s->pb);
57 
59 
60  if (!time_base.den || !time_base.num) {
61  av_log(s, AV_LOG_ERROR, "Invalid frame rate\n");
62  return AVERROR_INVALIDDATA;
63  }
64 
65  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
66 
67  return 0;
68 }
69 
71 {
72  int ret, size = avio_rl32(s->pb);
73  int64_t pts = avio_rl64(s->pb);
74 
75  ret = av_get_packet(s->pb, pkt, size);
76  pkt->stream_index = 0;
77  pkt->pts = pts;
78  pkt->pos -= 12;
79 
80  return ret;
81 }
82 
84  .name = "ivf",
85  .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"),
86  .read_probe = probe,
87  .read_header = read_header,
88  .read_packet = read_packet,
89  .flags = AVFMT_GENERIC_INDEX,
90  .codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
91 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
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:2955
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
int num
numerator
Definition: rational.h:44
AVInputFormat ff_ivf_demuxer
Definition: ivfdec.c:83
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
Format I/O context.
Definition: avformat.h:1325
int width
Video only.
Definition: avcodec.h:4005
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,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:720
#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
static int probe(AVProbeData *p)
Definition: ivfdec.c:26
Only parse headers, do not repack.
Definition: avformat.h:807
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ivfdec.c:70
Stream structure.
Definition: avformat.h:876
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:485
rational number numerator/denominator
Definition: rational.h:43
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.
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:704
Main libavformat public API header.
int den
denominator
Definition: rational.h:45
static int read_header(AVFormatContext *s)
Definition: ivfdec.c:35
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3943
int stream_index
Definition: avcodec.h:1590
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1565
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:728
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1581