blob: 828b853483e21b7d276f43657b93941dd7937067
| 1 | /* |
| 2 | * SVAG 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 "avformat.h" |
| 23 | #include "internal.h" |
| 24 | |
| 25 | static int svag_probe(AVProbeData *p) |
| 26 | { |
| 27 | if (memcmp(p->buf, "Svag", 4)) |
| 28 | return 0; |
| 29 | |
| 30 | return AVPROBE_SCORE_MAX; |
| 31 | } |
| 32 | |
| 33 | static int svag_read_header(AVFormatContext *s) |
| 34 | { |
| 35 | unsigned size, align; |
| 36 | AVStream *st; |
| 37 | |
| 38 | avio_skip(s->pb, 4); |
| 39 | |
| 40 | st = avformat_new_stream(s, NULL); |
| 41 | if (!st) |
| 42 | return AVERROR(ENOMEM); |
| 43 | |
| 44 | size = avio_rl32(s->pb); |
| 45 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 46 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; |
| 47 | st->codecpar->sample_rate = avio_rl32(s->pb); |
| 48 | if (st->codecpar->sample_rate <= 0) |
| 49 | return AVERROR_INVALIDDATA; |
| 50 | st->codecpar->channels = avio_rl32(s->pb); |
| 51 | if (st->codecpar->channels <= 0 || st->codecpar->channels > 8) |
| 52 | return AVERROR_INVALIDDATA; |
| 53 | st->duration = size / (16 * st->codecpar->channels) * 28; |
| 54 | align = avio_rl32(s->pb); |
| 55 | if (align <= 0 || align > INT_MAX / st->codecpar->channels) |
| 56 | return AVERROR_INVALIDDATA; |
| 57 | st->codecpar->block_align = align * st->codecpar->channels; |
| 58 | avio_skip(s->pb, 0x800 - avio_tell(s->pb)); |
| 59 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | static int svag_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 65 | { |
| 66 | AVCodecParameters *par = s->streams[0]->codecpar; |
| 67 | |
| 68 | return av_get_packet(s->pb, pkt, par->block_align); |
| 69 | } |
| 70 | |
| 71 | AVInputFormat ff_svag_demuxer = { |
| 72 | .name = "svag", |
| 73 | .long_name = NULL_IF_CONFIG_SMALL("Konami PS2 SVAG"), |
| 74 | .read_probe = svag_probe, |
| 75 | .read_header = svag_read_header, |
| 76 | .read_packet = svag_read_packet, |
| 77 | .extensions = "svag", |
| 78 | }; |
| 79 |