blob: e8ebcaffd6aa8fa06e38d46e0a54ecb842062dcc
| 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 | |
| 26 | static int vag_probe(AVProbeData *p) |
| 27 | { |
| 28 | if (memcmp(p->buf, "VAGp\0\0\0", 7)) |
| 29 | return 0; |
| 30 | |
| 31 | return AVPROBE_SCORE_MAX; |
| 32 | } |
| 33 | |
| 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 | |
| 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 |