libavformat/rsodec.c

   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 "demux.h"
  27 #include "internal.h"
  28 #include "pcm.h"
  29 #include "rso.h"
  30
  31 static int rso_read_header(AVFormatContext *s)
  32 {
  33     AVIOContext *pb = s->pb;
  34     int id, rate, bps;
  35     unsigned int size;
  36     enum AVCodecID codec;
  37     AVStream *st;
  38
  39     id   = avio_rb16(pb);
  40     size = avio_rb16(pb);
  41     rate = avio_rb16(pb);
  42     avio_rb16(pb);   /* play mode ? (0x0000 = don't loop) */
  43
  44     codec = ff_codec_get_id(ff_codec_rso_tags, id);
  45
  46     if (codec == AV_CODEC_ID_ADPCM_IMA_WAV) {
  47         avpriv_report_missing_feature(s, "ADPCM in RSO");
  48         return AVERROR_PATCHWELCOME;
  49     }
  50
  51     bps = av_get_bits_per_sample(codec);
  52     if (!bps) {
  53         avpriv_request_sample(s, "Unknown bits per sample");
  54         return AVERROR_PATCHWELCOME;
  55     }
  56
  57     /* now we are ready: build format streams */
  58     st = avformat_new_stream(s, NULL);
  59     if (!st)
  60         return AVERROR(ENOMEM);
  61
  62     st->duration            = (size * 8) / bps;
  63     st->codecpar->codec_type   = AVMEDIA_TYPE_AUDIO;
  64     st->codecpar->codec_tag    = id;
  65     st->codecpar->codec_id     = codec;
  66     st->codecpar->ch_layout    = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
  67     st->codecpar->sample_rate  = rate;
  68     st->codecpar->block_align  = 1;
  69
  70     avpriv_set_pts_info(st, 64, 1, rate);
  71
  72     return 0;
  73 }
  74
  75 const FFInputFormat ff_rso_demuxer = {
  76     .p.name         =   "rso",
  77     .p.long_name    =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
  78     .p.extensions   =   "rso",
  79     .p.codec_tag    =   ff_rso_codec_tags_list,
  80     .read_header    =   rso_read_header,
  81     .read_packet    =   ff_pcm_read_packet,
  82     .read_seek      =   ff_pcm_read_seek,
  83 };