1/* 2 * MTAF demuxer 3 * Copyright (c) 2016 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 "libavutil/intreadwrite.h" 24#include "avformat.h" 25#include "internal.h" 26 27static int mtaf_probe(const AVProbeData *p) 28{ 29 if (p->buf_size < 0x44) 30 return 0; 31 32 if (AV_RL32(p->buf) != MKTAG('M','T','A','F') || 33 AV_RL32(p->buf + 0x40) != MKTAG('H','E','A','D')) 34 return 0; 35 36 return AVPROBE_SCORE_MAX; 37} 38 39static int mtaf_read_header(AVFormatContext *s) 40{ 41 int stream_count; 42 AVStream *st; 43 44 st = avformat_new_stream(s, NULL); 45 if (!st) 46 return AVERROR(ENOMEM); 47 48 avio_skip(s->pb, 0x5c); 49 st->duration = avio_rl32(s->pb); 50 avio_skip(s->pb, 1); 51 stream_count = avio_r8(s->pb); 52 if (!stream_count) 53 return AVERROR_INVALIDDATA; 54 55 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 56 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MTAF; 57 st->codecpar->ch_layout.nb_channels = 2 * stream_count; 58 st->codecpar->sample_rate = 48000; 59 st->codecpar->block_align = 0x110 * st->codecpar->ch_layout.nb_channels / 2; 60 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); 61 62 avio_seek(s->pb, 0x800, SEEK_SET); 63 64 return 0; 65} 66 67static int mtaf_read_packet(AVFormatContext *s, AVPacket *pkt) 68{ 69 AVCodecParameters *par = s->streams[0]->codecpar; 70 71 return av_get_packet(s->pb, pkt, par->block_align); 72} 73 74const AVInputFormat ff_mtaf_demuxer = { 75 .name = "mtaf", 76 .long_name = NULL_IF_CONFIG_SMALL("Konami PS2 MTAF"), 77 .read_probe = mtaf_probe, 78 .read_header = mtaf_read_header, 79 .read_packet = mtaf_read_packet, 80 .extensions = "mtaf", 81}; 82