FFmpeg  4.3.6
vpk.c
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1 /*
2  * VPK 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 
22 #include "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 
26 typedef struct VPKDemuxContext {
27  unsigned data_start;
28  unsigned block_count;
29  unsigned current_block;
30  unsigned last_block_size;
32 
33 static int vpk_probe(const AVProbeData *p)
34 {
35  if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
36  return 0;
37 
38  return AVPROBE_SCORE_MAX / 3 * 2;
39 }
40 
42 {
43  VPKDemuxContext *vpk = s->priv_data;
44  unsigned offset;
45  unsigned samples_per_block;
46  AVStream *st;
47 
48  vpk->current_block = 0;
49  st = avformat_new_stream(s, NULL);
50  if (!st)
51  return AVERROR(ENOMEM);
52 
53  avio_skip(s->pb, 4);
54  st->duration = avio_rl32(s->pb) * 28 / 16;
55  offset = avio_rl32(s->pb);
58  st->codecpar->block_align = avio_rl32(s->pb);
59  st->codecpar->sample_rate = avio_rl32(s->pb);
60  if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
61  return AVERROR_INVALIDDATA;
62  st->codecpar->channels = avio_rl32(s->pb);
63  if (st->codecpar->channels <= 0)
64  return AVERROR_INVALIDDATA;
65  samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
66  if (samples_per_block <= 0)
67  return AVERROR_INVALIDDATA;
68  vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;
69  vpk->last_block_size = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
70 
71  if (offset < avio_tell(s->pb))
72  return AVERROR_INVALIDDATA;
73  avio_skip(s->pb, offset - avio_tell(s->pb));
74  vpk->data_start = offset;
75  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
76 
77  return 0;
78 }
79 
81 {
82  AVCodecParameters *par = s->streams[0]->codecpar;
83  VPKDemuxContext *vpk = s->priv_data;
84  int ret, i;
85 
86  vpk->current_block++;
87  if (vpk->current_block == vpk->block_count) {
88  unsigned size = vpk->last_block_size / par->channels;
89  unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
90  uint64_t pos = avio_tell(s->pb);
91 
92  ret = av_new_packet(pkt, vpk->last_block_size);
93  if (ret < 0)
94  return ret;
95  for (i = 0; i < par->channels; i++) {
96  ret = avio_read(s->pb, pkt->data + i * size, size);
97  avio_skip(s->pb, skip);
98  if (ret != size) {
99  return AVERROR(EIO);
100  }
101  }
102  pkt->pos = pos;
103  pkt->stream_index = 0;
104  } else if (vpk->current_block < vpk->block_count) {
105  ret = av_get_packet(s->pb, pkt, par->block_align);
106  pkt->stream_index = 0;
107  } else {
108  return AVERROR_EOF;
109  }
110 
111  return ret;
112 }
113 
114 static int vpk_read_seek(AVFormatContext *s, int stream_index,
115  int64_t timestamp, int flags)
116 {
117  AVStream *st = s->streams[stream_index];
118  AVCodecParameters *par = st->codecpar;
119  VPKDemuxContext *vpk = s->priv_data;
120  int samples_per_block;
121  int64_t ret = 0;
122 
123  samples_per_block = av_get_audio_frame_duration2(par, par->block_align);
124  timestamp /= samples_per_block;
125  ret = avio_seek(s->pb, vpk->data_start + timestamp * par->block_align, SEEK_SET);
126  if (ret < 0)
127  return ret;
128 
129  vpk->current_block = timestamp;
130  ff_update_cur_dts(s, st, timestamp * samples_per_block);
131  return 0;
132 }
133 
135  .name = "vpk",
136  .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
137  .priv_data_size = sizeof(VPKDemuxContext),
142  .extensions = "vpk",
143 };
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
unsigned block_count
Definition: vpk.c:28
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
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:4948
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
static int vpk_read_header(AVFormatContext *s)
Definition: vpk.c:41
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: utils.c:1966
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
uint8_t * data
Definition: packet.h:355
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:307
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static int vpk_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: vpk.c:114
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#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:188
unsigned int pos
Definition: spdifenc.c:412
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1815
static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vpk.c:80
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int block_align
Audio only.
Definition: codec_par.h:177
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_RL32
Definition: intreadwrite.h:146
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
AVInputFormat ff_vpk_demuxer
Definition: vpk.c:134
unsigned last_block_size
Definition: vpk.c:30
static int vpk_probe(const AVProbeData *p)
Definition: vpk.c:33
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
#define flags(name, subs,...)
Definition: cbs_av1.c:565
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:925
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
if(ret< 0)
Definition: vf_mcdeint.c:279
#define MKBETAG(a, b, c, d)
Definition: common.h:407
unsigned current_block
Definition: vpk.c:29
void * priv_data
Format private data.
Definition: avformat.h:1379
int channels
Audio only.
Definition: codec_par.h:166
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int stream_index
Definition: packet.h:357
unsigned data_start
Definition: vpk.c:27
This structure stores compressed data.
Definition: packet.h:332