1 /*
2 * XVAG 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/bswap.h"
23 #include "libavcodec/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26
xvag_probe(const AVProbeData * p)27 static int xvag_probe(const AVProbeData *p)
28 {
29 if (memcmp(p->buf, "XVAG", 4) ||
30 memcmp(p->buf+32, "fmat", 4))
31 return 0;
32
33 return AVPROBE_SCORE_MAX;
34 }
35
xvag_read_header(AVFormatContext * s)36 static int xvag_read_header(AVFormatContext *s)
37 {
38 unsigned offset, big_endian, codec;
39 AVStream *st;
40
41 avio_skip(s->pb, 4);
42
43 st = avformat_new_stream(s, NULL);
44 if (!st)
45 return AVERROR(ENOMEM);
46
47 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
48
49 offset = avio_rl32(s->pb);
50 big_endian = offset > av_bswap32(offset);
51 if (big_endian) {
52 offset = av_bswap32(offset);
53 avio_skip(s->pb, 28);
54 codec = avio_rb32(s->pb);
55 st->codecpar->channels = avio_rb32(s->pb);
56 avio_skip(s->pb, 4);
57 st->duration = avio_rb32(s->pb);
58 avio_skip(s->pb, 8);
59 st->codecpar->sample_rate = avio_rb32(s->pb);
60 } else {
61 avio_skip(s->pb, 28);
62 codec = avio_rl32(s->pb);
63 st->codecpar->channels = avio_rl32(s->pb);
64 avio_skip(s->pb, 4);
65 st->duration = avio_rl32(s->pb);
66 avio_skip(s->pb, 8);
67 st->codecpar->sample_rate = avio_rl32(s->pb);
68 }
69
70 if (st->codecpar->sample_rate <= 0)
71 return AVERROR_INVALIDDATA;
72 if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
73 return AVERROR_INVALIDDATA;
74
75 switch (codec) {
76 case 0x1c:
77 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
78 st->codecpar->block_align = 16 * st->codecpar->channels;
79 break;
80 default:
81 avpriv_request_sample(s, "codec %X", codec);
82 return AVERROR_PATCHWELCOME;
83 };
84
85 avio_skip(s->pb, offset - avio_tell(s->pb));
86
87 if (avio_rb16(s->pb) == 0xFFFB) {
88 st->codecpar->codec_id = AV_CODEC_ID_MP3;
89 st->codecpar->block_align = 0x1000;
90 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
91 }
92
93 avio_skip(s->pb, -2);
94 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
95
96 return 0;
97 }
98
xvag_read_packet(AVFormatContext * s,AVPacket * pkt)99 static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt)
100 {
101 AVCodecParameters *par = s->streams[0]->codecpar;
102
103 return av_get_packet(s->pb, pkt, par->block_align);
104 }
105
106 AVInputFormat ff_xvag_demuxer = {
107 .name = "xvag",
108 .long_name = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"),
109 .read_probe = xvag_probe,
110 .read_header = xvag_read_header,
111 .read_packet = xvag_read_packet,
112 .extensions = "xvag",
113 };
114