libavformat/mtaf.c

   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
  27 static 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
  39 static 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->channels    = 2 * stream_count;
  58     st->codecpar->sample_rate = 48000;
  59     st->codecpar->block_align = 0x110 * st->codecpar->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
  67 static 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
  74 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 };