FFmpeg: libavformat/sdr2.c Source File

FFmpeg
sdr2.c
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1 /*
2  * SDR2 demuxer
3  * Copyright (c) 2014 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 
26  static int sdr2_probe(AVProbeData *p)
27 {
28  if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1))
29  return 0;
30 
31  return AVPROBE_SCORE_EXTENSION;
32 }
33 
34  #define FIRST 0xA8
35 
36  static int sdr2_read_header(AVFormatContext *s)
37 {
38  AVStream *st, *ast;
39 
40  ast = avformat_new_stream(s, 0);
41  if (!ast)
42  return AVERROR(ENOMEM);
43 
44  st = avformat_new_stream(s, 0);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
48  avio_skip(s->pb, 20);
49  avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb));
50  st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
51  st->codecpar->width = avio_rl32(s->pb);
52  st->codecpar->height = avio_rl32(s->pb);
53  st->codecpar->codec_id = AV_CODEC_ID_H264;
54  st->need_parsing = AVSTREAM_PARSE_FULL;
55 
56  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
57  ast->codecpar->channels = 1;
58  ast->codecpar->sample_rate = 8000;
59  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
60  avpriv_set_pts_info(ast, 64, 1, 8000);
61 
62  avio_seek(s->pb, FIRST, SEEK_SET);
63 
64  return 0;
65 }
66 
67  static const uint8_t header[24] = {
68  0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e,
69  0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00,
70  0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00
71 };
72 
73  static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
74 {
75  int64_t pos;
76  unsigned next;
77  int flags, ret = 0, is_video;
78 
79  pos = avio_tell(s->pb);
80 
81  flags = avio_rl32(s->pb);
82  avio_skip(s->pb, 4);
83 
84  next = avio_rl32(s->pb);
85  if (next <= 52)
86  return AVERROR_INVALIDDATA;
87 
88  avio_skip(s->pb, 6);
89  is_video = avio_rl32(s->pb);
90  avio_skip(s->pb, 30);
91 
92  if (pos == FIRST) {
93  if (av_new_packet(pkt, next - 52 + 24) < 0)
94  return AVERROR(ENOMEM);
95  memcpy(pkt->data, header, 24);
96  ret = avio_read(s->pb, pkt->data + 24, next - 52);
97  if (ret < 0) {
98  av_packet_unref(pkt);
99  return ret;
100  }
101  av_shrink_packet(pkt, ret + 24);
102  } else {
103  ret = av_get_packet(s->pb, pkt, next - 52);
104  }
105  pkt->stream_index = !!is_video;
106  pkt->pos = pos;
107  if (flags & (1 << 12))
108  pkt->flags |= AV_PKT_FLAG_KEY;
109 
110  return ret;
111 }
112 
113  AVInputFormat ff_sdr2_demuxer = {
114  .name = "sdr2",
115  .long_name = NULL_IF_CONFIG_SMALL("SDR2"),
116  .read_probe = sdr2_probe,
117  .read_header = sdr2_read_header,
118  .read_packet = sdr2_read_packet,
119  .extensions = "sdr2",
120  .flags = AVFMT_GENERIC_INDEX,
121 };
s
const char * s
Definition: avisynth_c.h:768
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1450
av_shrink_packet
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
avpriv_set_pts_info
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:4820
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AV_CODEC_ID_H264
Definition: avcodec.h:245
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodecParameters::width
int width
Video only.
Definition: avcodec.h:3950
AVStream::need_parsing
enum AVStreamParseType need_parsing
Definition: avformat.h:1091
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4450
AVPacket::data
uint8_t * data
Definition: avcodec.h:1430
flags
static int flags
Definition: log.c:55
av_get_packet
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
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
header
static const uint8_t header[24]
Definition: sdr2.c:67
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1462
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ff_sdr2_demuxer
AVInputFormat ff_sdr2_demuxer
Definition: sdr2.c:113
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
AVStream
Stream structure.
Definition: avformat.h:873
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:592
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:470
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:3994
AVSTREAM_PARSE_FULL
full parsing and repack
Definition: avformat.h:793
avformat.h
Main libavformat public API header.
AV_CODEC_ID_PCM_S16LE
Definition: avcodec.h:452
sdr2_read_packet
static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sdr2.c:73
sdr2_probe
static int sdr2_probe(AVProbeData *p)
Definition: sdr2.c:26
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:3990
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
sdr2_read_header
static int sdr2_read_header(AVFormatContext *s)
Definition: sdr2.c:36
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1432
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:366
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1407
FIRST
#define FIRST
Definition: sdr2.c:34
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