/*
  * 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(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",
 };