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  1. /*
  2.  * RSO demuxer
  3.  * Copyright (c) 2001 Fabrice Bellard (original AU code)
  4.  * Copyright (c) 2010 Rafael Carre
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "libavutil/channel_layout.h"
  24. #include "libavutil/intreadwrite.h"
  25. #include "avformat.h"
  26. #include "internal.h"
  27. #include "pcm.h"
  28. #include "rso.h"
  29.  
  30. static int rso_read_header(AVFormatContext *s)
  31. {
  32.     AVIOContext *pb = s->pb;
  33.     int id, rate, bps;
  34.     unsigned int size;
  35.     enum AVCodecID codec;
  36.     AVStream *st;
  37.  
  38.     id   = avio_rb16(pb);
  39.     size = avio_rb16(pb);
  40.     rate = avio_rb16(pb);
  41.     avio_rb16(pb);   /* play mode ? (0x0000 = don't loop) */
  42.  
  43.     codec = ff_codec_get_id(ff_codec_rso_tags, id);
  44.  
  45.     if (codec == AV_CODEC_ID_ADPCM_IMA_WAV) {
  46.         avpriv_report_missing_feature(s, "ADPCM in RSO");
  47.         return AVERROR_PATCHWELCOME;
  48.     }
  49.  
  50.     bps = av_get_bits_per_sample(codec);
  51.     if (!bps) {
  52.         avpriv_request_sample(s, "Unknown bits per sample");
  53.         return AVERROR_PATCHWELCOME;
  54.     }
  55.  
  56.     /* now we are ready: build format streams */
  57.     st = avformat_new_stream(s, NULL);
  58.     if (!st)
  59.         return AVERROR(ENOMEM);
  60.  
  61.     st->duration            = (size * 8) / bps;
  62.     st->codec->codec_type   = AVMEDIA_TYPE_AUDIO;
  63.     st->codec->codec_tag    = id;
  64.     st->codec->codec_id     = codec;
  65.     st->codec->channels     = 1;
  66.     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
  67.     st->codec->sample_rate  = rate;
  68.     st->codec->block_align  = 1;
  69.  
  70.     avpriv_set_pts_info(st, 64, 1, rate);
  71.  
  72.     return 0;
  73. }
  74.  
  75. AVInputFormat ff_rso_demuxer = {
  76.     .name           =   "rso",
  77.     .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
  78.     .extensions     =   "rso",
  79.     .read_header    =   rso_read_header,
  80.     .read_packet    =   ff_pcm_read_packet,
  81.     .read_seek      =   ff_pcm_read_seek,
  82.     .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
  83. };
  84.