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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. #include "internal.h"
  25.  
  26. static int probe(AVProbeData *p)
  27. {
  28.     if (p->buf_size < 2096)
  29.         return 0;
  30.     if (   AV_RL32(p->buf     ) != 1
  31.         || AV_RL32(p->buf +  8) > 100000
  32.         || AV_RL32(p->buf + 12) > 8
  33.         || AV_RL32(p->buf + 16) != 2096
  34.         ||!AV_RL32(p->buf + 21)
  35.         || AV_RL16(p->buf + 25) != 2096
  36.         || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
  37.         )
  38.         return 0;
  39.     return AVPROBE_SCORE_EXTENSION;
  40. }
  41.  
  42.  
  43. static int read_header(AVFormatContext *s)
  44. {
  45.     AVStream *st = avformat_new_stream(s, NULL);
  46.     if (!st)
  47.         return AVERROR(ENOMEM);
  48.  
  49.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  50.     st->codec->codec_id = AV_CODEC_ID_ADPCM_MS;
  51.  
  52.     avio_rl32(s->pb);
  53.     avio_rl32(s->pb);
  54.     st->codec->sample_rate = avio_rl32(s->pb);
  55.     st->codec->channels    = avio_rl32(s->pb);
  56.     s->internal->data_offset = avio_rl32(s->pb);
  57.     avio_r8(s->pb);
  58.     st->codec->block_align = st->codec->channels * avio_rl32(s->pb);
  59.  
  60.     avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
  61.  
  62.     return 0;
  63. }
  64.  
  65. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  66. {
  67.     AVStream *st = s->streams[0];
  68.  
  69.     return av_get_packet(s->pb, pkt, st->codec->block_align);
  70. }
  71.  
  72. AVInputFormat ff_boa_demuxer = {
  73.     .name           = "boa",
  74.     .long_name      = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
  75.     .read_probe     = probe,
  76.     .read_header    = read_header,
  77.     .read_packet    = read_packet,
  78.     .flags          = AVFMT_GENERIC_INDEX,
  79. };
  80.