aac5773f
 hucm
功能基本完成，接口待打磨
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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 "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->channels = 1;
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
st->codecpar->sample_rate = rate;
st->codecpar->block_align = 1;
avpriv_set_pts_info(st, 64, 1, rate);
return 0;
}
AVInputFormat ff_rso_demuxer = {
.name = "rso",
.long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
.extensions = "rso",
.read_header = rso_read_header,
.read_packet = ff_pcm_read_packet,
.read_seek = ff_pcm_read_seek,
.codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0},
};
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