libavformat/fwse.c

   1 /*
   2  * FWSE demuxer
   3  * Copyright (c) 2020 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 "demux.h"
  26 #include "internal.h"
  27 #include "pcm.h"
  28
  29 static int fwse_probe(const AVProbeData *p)
  30 {
  31     if (AV_RL32(p->buf) != MKTAG('F','W','S','E'))
  32         return 0;
  33     if (AV_RL32(p->buf+4) != 2 && AV_RL32(p->buf+4) != 3)
  34         return 0;
  35     if (AV_RL32(p->buf+16) != 1 && AV_RL32(p->buf+16) != 2)
  36         return 0;
  37
  38     return AVPROBE_SCORE_MAX / 4 * 3;
  39 }
  40
  41 static int fwse_read_header(AVFormatContext *s)
  42 {
  43     unsigned start_offset, version;
  44     int channels;
  45     AVIOContext *pb = s->pb;
  46     AVCodecParameters *par;
  47     AVStream *st;
  48
  49     avio_skip(pb, 4);
  50     version = avio_rl32(pb);
  51     if (version != 2 && version != 3)
  52         return AVERROR_INVALIDDATA;
  53     avio_skip(pb, 4);
  54     start_offset = avio_rl32(pb);
  55
  56     st = avformat_new_stream(s, NULL);
  57     if (!st)
  58         return AVERROR(ENOMEM);
  59
  60     par              = st->codecpar;
  61     par->codec_type  = AVMEDIA_TYPE_AUDIO;
  62     par->codec_id    = AV_CODEC_ID_ADPCM_IMA_MTF;
  63     par->format      = AV_SAMPLE_FMT_S16;
  64     channels         = avio_rl32(pb);
  65     if (channels != 1 && channels != 2)
  66         return AVERROR_INVALIDDATA;
  67     av_channel_layout_default(&par->ch_layout, channels);
  68     st->duration = avio_rl32(pb);
  69     par->sample_rate = avio_rl32(pb);
  70     if (par->sample_rate <= 0)
  71         return AVERROR_INVALIDDATA;
  72
  73     par->block_align = 1;
  74     avio_skip(pb, start_offset - avio_tell(pb));
  75
  76     avpriv_set_pts_info(st, 64, 1, par->sample_rate);
  77
  78     return 0;
  79 }
  80
  81 const FFInputFormat ff_fwse_demuxer = {
  82     .p.name         = "fwse",
  83     .p.long_name    = NULL_IF_CONFIG_SMALL("Capcom's MT Framework sound"),
  84     .p.extensions   = "fwse",
  85     .read_probe     = fwse_probe,
  86     .read_header    = fwse_read_header,
  87     .read_packet    = ff_pcm_read_packet,
  88 };