| /* |
| * MTAF demuxer |
| * Copyright (c) 2016 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| static int mtaf_probe(const AVProbeData *p) |
| { |
| if (p->buf_size < 0x44) |
| return 0; |
| |
| if (AV_RL32(p->buf) != MKTAG('M','T','A','F') || |
| AV_RL32(p->buf + 0x40) != MKTAG('H','E','A','D')) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int mtaf_read_header(AVFormatContext *s) |
| { |
| int stream_count; |
| AVStream *st; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| avio_skip(s->pb, 0x5c); |
| st->duration = avio_rl32(s->pb); |
| avio_skip(s->pb, 1); |
| stream_count = avio_r8(s->pb); |
| if (!stream_count) |
| return AVERROR_INVALIDDATA; |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MTAF; |
| st->codecpar->channels = 2 * stream_count; |
| st->codecpar->sample_rate = 48000; |
| st->codecpar->block_align = 0x110 * st->codecpar->channels / 2; |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| avio_seek(s->pb, 0x800, SEEK_SET); |
| |
| return 0; |
| } |
| |
| static int mtaf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| |
| return av_get_packet(s->pb, pkt, par->block_align); |
| } |
| |
| AVInputFormat ff_mtaf_demuxer = { |
| .name = "mtaf", |
| .long_name = NULL_IF_CONFIG_SMALL("Konami PS2 MTAF"), |
| .read_probe = mtaf_probe, |
| .read_header = mtaf_read_header, |
| .read_packet = mtaf_read_packet, |
| .extensions = "mtaf", |
| }; |