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->ch_layout.nb_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->ch_layout.nb_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->ch_layout.nb_channels <= 0 ||
73 st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS)
74 return AVERROR_INVALIDDATA;
75
76 switch (codec) {
77 case 0x1c:
78 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
79 st->codecpar->block_align = 16 * st->codecpar->ch_layout.nb_channels;
80 break;
81 default:
82 avpriv_request_sample(s, "codec %X", codec);
83 return AVERROR_PATCHWELCOME;
84 };
85
86 avio_skip(s->pb, offset - avio_tell(s->pb));
87
88 if (avio_rb16(s->pb) == 0xFFFB) {
89 st->codecpar->codec_id = AV_CODEC_ID_MP3;
90 st->codecpar->block_align = 0x1000;
91 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
92 }
93
94 avio_skip(s->pb, -2);
95 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
96
97 return 0;
98 }
99
xvag_read_packet(AVFormatContext *s, AVPacket *pkt)100 static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt)
101 {
102 AVCodecParameters *par = s->streams[0]->codecpar;
103
104 return av_get_packet(s->pb, pkt, par->block_align);
105 }
106
107 const AVInputFormat ff_xvag_demuxer = {
108 .name = "xvag",
109 .long_name = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"),
110 .read_probe = xvag_probe,
111 .read_header = xvag_read_header,
112 .read_packet = xvag_read_packet,
113 .extensions = "xvag",
114 };
115