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
22 #include "libavutil/channel_layout.h"
23 #include "avformat.h"
24 #include "internal.h"
25
vag_probe(const AVProbeData * p)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
vag_read_header(AVFormatContext * s)34 static int vag_read_header(AVFormatContext *s)
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);
43 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
44 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
45 st->codecpar->channels = 1 + (avio_rb32(s->pb) == 0x00000004);
46 avio_skip(s->pb, 4);
47 if (st->codecpar->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->channels;
58 avio_seek(s->pb, 0, SEEK_SET);
59 st->duration = st->duration / 16 * 28;
60 } else {
61 st->codecpar->block_align = 16 * st->codecpar->channels;
62 avio_seek(s->pb, st->codecpar->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
vag_read_packet(AVFormatContext * s,AVPacket * pkt)69 static int vag_read_packet(AVFormatContext *s, AVPacket *pkt)
70 {
71 AVCodecParameters *par = s->streams[0]->codecpar;
72
73 return av_get_packet(s->pb, pkt, par->block_align);
74 }
75
76 AVInputFormat ff_vag_demuxer = {
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 };
84