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  1. /*
  2.  * Black ops audio demuxer
  3.  * Copyright (c) 2013 Michael Niedermayer
  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/intreadwrite.h"
  23. #include "avformat.h"
  24.  
  25. static int probe(AVProbeData *p)
  26. {
  27.     if (p->buf_size < 2096)
  28.         return 0;
  29.     if (   AV_RL32(p->buf     ) != 1
  30.         || AV_RL32(p->buf +  8) > 100000
  31.         || AV_RL32(p->buf + 12) > 8
  32.         || AV_RL32(p->buf + 16) != 2096
  33.         ||!AV_RL32(p->buf + 21)
  34.         || AV_RL16(p->buf + 25) != 2096
  35.         || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
  36.         )
  37.         return 0;
  38.     return AVPROBE_SCORE_EXTENSION;
  39. }
  40.  
  41.  
  42. static int read_header(AVFormatContext *s)
  43. {
  44.     AVStream *st = avformat_new_stream(s, NULL);
  45.     if (!st)
  46.         return AVERROR(ENOMEM);
  47.  
  48.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  49.     st->codec->codec_id = AV_CODEC_ID_ADPCM_MS;
  50.  
  51.     avio_rl32(s->pb);
  52.     avio_rl32(s->pb);
  53.     st->codec->sample_rate = avio_rl32(s->pb);
  54.     st->codec->channels    = avio_rl32(s->pb);
  55.     s->data_offset         = avio_rl32(s->pb);
  56.     avio_r8(s->pb);
  57.     st->codec->block_align = st->codec->channels * avio_rl32(s->pb);
  58.  
  59.     avio_seek(s->pb, s->data_offset, SEEK_SET);
  60.  
  61.     return 0;
  62. }
  63.  
  64. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  65. {
  66.     AVStream *st = s->streams[0];
  67.  
  68.     return av_get_packet(s->pb, pkt, st->codec->block_align);
  69. }
  70.  
  71. AVInputFormat ff_boa_demuxer = {
  72.     .name           = "boa",
  73.     .long_name      = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
  74.     .read_probe     = probe,
  75.     .read_header    = read_header,
  76.     .read_packet    = read_packet,
  77.     .flags          = AVFMT_GENERIC_INDEX,
  78. };
  79.