1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* VPK demuxer
* Copyright (c) 2015 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
typedef struct VPKDemuxContext {
unsigned data_start;
unsigned block_count;
unsigned current_block;
unsigned last_block_size;
} VPKDemuxContext;
static int vpk_probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
return 0;
return AVPROBE_SCORE_MAX / 3 * 2;
}
static int vpk_read_header(AVFormatContext *s)
{
VPKDemuxContext *vpk = s->priv_data;
unsigned offset;
unsigned samples_per_block;
AVStream *st;
vpk->current_block = 0;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avio_skip(s->pb, 4);
st->duration = avio_rl32(s->pb) * 28 / 16;
offset = avio_rl32(s->pb);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->block_align = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);
if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
return AVERROR_INVALIDDATA;
st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels <= 0)
return AVERROR_INVALIDDATA;
samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
if (samples_per_block <= 0)
return AVERROR_INVALIDDATA;
vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;
vpk->last_block_size = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
if (offset < avio_tell(s->pb))
return AVERROR_INVALIDDATA;
avio_skip(s->pb, offset - avio_tell(s->pb));
vpk->data_start = offset;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
VPKDemuxContext *vpk = s->priv_data;
int ret, i;
vpk->current_block++;
if (vpk->current_block == vpk->block_count) {
unsigned size = vpk->last_block_size / par->channels;
unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
uint64_t pos = avio_tell(s->pb);
ret = av_new_packet(pkt, vpk->last_block_size);
if (ret < 0)
return ret;
for (i = 0; i < par->channels; i++) {
ret = avio_read(s->pb, pkt->data + i * size, size);
avio_skip(s->pb, skip);
if (ret != size) {
return AVERROR(EIO);
}
}
pkt->pos = pos;
pkt->stream_index = 0;
} else if (vpk->current_block < vpk->block_count) {
ret = av_get_packet(s->pb, pkt, par->block_align);
pkt->stream_index = 0;
} else {
return AVERROR_EOF;
}
return ret;
}
static int vpk_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
AVCodecParameters *par = st->codecpar;
VPKDemuxContext *vpk = s->priv_data;
int samples_per_block;
int64_t ret = 0;
samples_per_block = av_get_audio_frame_duration2(par, par->block_align);
if (samples_per_block > 0)
timestamp /= samples_per_block;
else
return -1;
ret = avio_seek(s->pb, vpk->data_start + timestamp * par->block_align, SEEK_SET);
if (ret < 0)
return ret;
vpk->current_block = timestamp;
ff_update_cur_dts(s, st, timestamp * samples_per_block);
return 0;
}
const AVInputFormat ff_vpk_demuxer = {
.name = "vpk",
.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
.priv_data_size = sizeof(VPKDemuxContext),
.read_probe = vpk_probe,
.read_header = vpk_read_header,
.read_packet = vpk_read_packet,
.read_seek = vpk_read_seek,
.extensions = "vpk",
};
|
