/*
  * RSO demuxer
  * Copyright (c) 2001 Fabrice Bellard (original AU code)
  * Copyright (c) 2010 Rafael Carre
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "internal.h"

 #include "pcm.h"

 #include "riff.h"
 #include "rso.h"
 
 static int rso_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {

     AVIOContext *pb = s->pb;

     int id, rate, bps;
     unsigned int size;
     enum CodecID codec;
     AVStream *st;
 

     id   = avio_rb16(pb);
     size = avio_rb16(pb);
     rate = avio_rb16(pb);
     avio_rb16(pb);   /* play mode ? (0x0000 = don't loop) */

 
     codec = ff_codec_get_id(ff_codec_rso_tags, id);
 
     if (codec == CODEC_ID_ADPCM_IMA_WAV) {
         av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
         return AVERROR_PATCHWELCOME;
     }
 
     bps = av_get_bits_per_sample(codec);
     if (!bps) {
         av_log_ask_for_sample(s, "could not determine bits per sample\n");
         return AVERROR_INVALIDDATA;
     }
 
     /* now we are ready: build format streams */
     st = av_new_stream(s, 0);
     if (!st)
         return AVERROR(ENOMEM);
 
     st->duration            = (size * 8) / bps;
     st->codec->codec_type   = AVMEDIA_TYPE_AUDIO;
     st->codec->codec_tag    = id;
     st->codec->codec_id     = codec;
     st->codec->channels     = 1;
     st->codec->sample_rate  = rate;
 
     av_set_pts_info(st, 64, 1, rate);
 
     return 0;
 }
 
 #define BLOCK_SIZE 1024 /* in samples */
 
 static int rso_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int bps = av_get_bits_per_sample(s->streams[0]->codec->codec_id);
     int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3);
 
     if (ret < 0)
         return ret;
 
     pkt->stream_index = 0;
 
     /* note: we need to modify the packet size here to handle the last packet */
     pkt->size = ret;
 
     return 0;
 }
 

 AVInputFormat ff_rso_demuxer = {

     .name           =   "rso",
     .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),
     .extensions     =   "rso",
     .priv_data_size =   0,
     .read_probe     =   NULL, /* no magic value in this format */
     .read_header    =   rso_read_header,
     .read_packet    =   rso_read_packet,
     .read_close     =   NULL,
     .read_seek      =   pcm_read_seek,
     .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
 };