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ffmpeg / libavformat / rsodec.c @ e63a3628

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/*
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 * RSO demuxer
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 * Copyright (c) 2001 Fabrice Bellard (original AU code)
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 * Copyright (c) 2010 Rafael Carre
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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#include "riff.h"
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#include "rso.h"
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static int rso_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    AVIOContext *pb = s->pb;
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    int id, rate, bps;
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    unsigned int size;
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    enum CodecID codec;
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    AVStream *st;
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    id   = avio_rb16(pb);
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    size = avio_rb16(pb);
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    rate = avio_rb16(pb);
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    avio_rb16(pb);   /* play mode ? (0x0000 = don't loop) */
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    codec = ff_codec_get_id(ff_codec_rso_tags, id);
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    if (codec == CODEC_ID_ADPCM_IMA_WAV) {
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        av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
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        return AVERROR_PATCHWELCOME;
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    }
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    bps = av_get_bits_per_sample(codec);
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    if (!bps) {
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        av_log_ask_for_sample(s, "could not determine bits per sample\n");
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        return AVERROR_INVALIDDATA;
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    }
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    /* now we are ready: build format streams */
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->duration            = (size * 8) / bps;
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    st->codec->codec_type   = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_tag    = id;
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    st->codec->codec_id     = codec;
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    st->codec->channels     = 1;
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    st->codec->sample_rate  = rate;
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    av_set_pts_info(st, 64, 1, rate);
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    return 0;
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}
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#define BLOCK_SIZE 1024 /* in samples */
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static int rso_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    int bps = av_get_bits_per_sample(s->streams[0]->codec->codec_id);
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    int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3);
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    if (ret < 0)
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        return ret;
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    pkt->stream_index = 0;
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    /* note: we need to modify the packet size here to handle the last packet */
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    pkt->size = ret;
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    return 0;
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}
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AVInputFormat ff_rso_demuxer = {
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    .name           =   "rso",
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    .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),
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    .extensions     =   "rso",
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    .priv_data_size =   0,
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    .read_probe     =   NULL, /* no magic value in this format */
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    .read_header    =   rso_read_header,
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    .read_packet    =   rso_read_packet,
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    .read_close     =   NULL,
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    .read_seek      =   pcm_read_seek,
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    .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
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};