rsodec.c

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/*
 * 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/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "pcm.h"
#include "rso.h"
 
static int rso_read_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    int id, rate, bps;
    unsigned int size;
    enum AVCodecID 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 == AV_CODEC_ID_ADPCM_IMA_WAV) {
        avpriv_report_missing_feature(s, "ADPCM in RSO");
        return AVERROR_PATCHWELCOME;
    }
 
    bps = av_get_bits_per_sample(codec);
    if (!bps) {
        avpriv_request_sample(s, "Unknown bits per sample");
        return AVERROR_PATCHWELCOME;
    }
 
    /* now we are ready: build format streams */
    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
 
    st->duration            = (size * 8) / bps;
    st->codecpar->codec_type   = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_tag    = id;
    st->codecpar->codec_id     = codec;
    st->codecpar->ch_layout    = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
    st->codecpar->sample_rate  = rate;
    st->codecpar->block_align  = 1;
 
    avpriv_set_pts_info(st, 64, 1, rate);
 
    return 0;
}
 
const FFInputFormat ff_rso_demuxer = {
    .p.name         =   "rso",
    .p.long_name    =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
    .p.extensions   =   "rso",
    .p.codec_tag    =   ff_rso_codec_tags_list,
    .read_header    =   rso_read_header,
    .read_packet    =   ff_pcm_read_packet,
    .read_seek      =   ff_pcm_read_seek,
};