FFmpeg
vag.c
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1 /*
2  * VAG demuxer
3  * Copyright (c) 2015 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 
23 #include "avformat.h"
24 #include "internal.h"
25 
26 static int vag_probe(const AVProbeData *p)
27 {
28  if (memcmp(p->buf, "VAGp\0\0\0", 7))
29  return 0;
30 
31  return AVPROBE_SCORE_MAX;
32 }
33 
35 {
36  AVStream *st;
37 
38  st = avformat_new_stream(s, NULL);
39  if (!st)
40  return AVERROR(ENOMEM);
41 
42  avio_skip(s->pb, 4);
45  st->codecpar->ch_layout.nb_channels = 1 + (avio_rb32(s->pb) == 0x00000004);
46  avio_skip(s->pb, 4);
47  if (st->codecpar->ch_layout.nb_channels > 1) {
48  st->duration = avio_rb32(s->pb);
49  } else {
50  st->duration = avio_rb32(s->pb) / 16 * 28;
51  }
52  st->codecpar->sample_rate = avio_rb32(s->pb);
53  if (st->codecpar->sample_rate <= 0)
54  return AVERROR_INVALIDDATA;
55  avio_seek(s->pb, 0x1000, SEEK_SET);
56  if (avio_rl32(s->pb) == MKTAG('V','A','G','p')) {
57  st->codecpar->block_align = 0x1000 * st->codecpar->ch_layout.nb_channels;
58  avio_seek(s->pb, 0, SEEK_SET);
59  st->duration = st->duration / 16 * 28;
60  } else {
62  avio_seek(s->pb, st->codecpar->ch_layout.nb_channels > 1 ? 0x80 : 0x30, SEEK_SET);
63  }
64  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
65 
66  return 0;
67 }
68 
70 {
71  AVCodecParameters *par = s->streams[0]->codecpar;
72 
73  return av_get_packet(s->pb, pkt, par->block_align);
74 }
75 
77  .name = "vag",
78  .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VAG"),
79  .read_probe = vag_probe,
80  .read_header = vag_read_header,
81  .read_packet = vag_read_packet,
82  .extensions = "vag",
83 };
AVERROR
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:317
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:464
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:761
vag_read_header
static int vag_read_header(AVFormatContext *s)
Definition: vag.c:34
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:900
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:808
vag_read_packet
static int vag_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vag.c:69
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:549
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:554
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:454
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1115
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
NULL
#define NULL
Definition: coverity.c:32
ff_vag_demuxer
const AVInputFormat ff_vag_demuxer
Definition: vag.c:76
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:452
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:206
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:171
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:777
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:106
vag_probe
static int vag_probe(const AVProbeData *p)
Definition: vag.c:26
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:178
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:103
AVStream
Stream structure.
Definition: avformat.h:841
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:278
avformat.h
channel_layout.h
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:365
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:468
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AV_CODEC_ID_ADPCM_PSX
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:406