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 26static 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 34static 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->ch_layout.nb_channels = 1 + (avio_rb32(s->pb) == 0x00000004); 46 avio_skip(s->pb, 4); 47 if (st->codecpar->ch_layout.nb_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->ch_layout.nb_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->ch_layout.nb_channels; 62 avio_seek(s->pb, st->codecpar->ch_layout.nb_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 69static 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 76const 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