mirror of
https://github.com/FFmpeg/FFmpeg.git
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111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/*
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* MD STUDIO audio demuxer
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*
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* Copyright (c) 2009 Benjamin Larsson
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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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/**
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* @file libavformat/aea.c
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*/
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#include "avformat.h"
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#include "raw.h"
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#include "libavutil/intreadwrite.h"
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#define AT1_SU_SIZE 212
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static int aea_read_probe(AVProbeData *p)
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{
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if (p->buf_size <= 2048+212)
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return 0;
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/* Magic is '00 08 00 00' in Little Endian*/
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if (AV_RL32(p->buf)==0x800) {
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int bsm_s, bsm_e, inb_s, inb_e;
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bsm_s = p->buf[2048];
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inb_s = p->buf[2048+1];
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inb_e = p->buf[2048+210];
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bsm_e = p->buf[2048+211];
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/* Check so that the redundant bsm bytes and info bytes are valid
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* the block size mode bytes have to be the same
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* the info bytes have to be the same
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* the block size mode and info byte can't be the same
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*/
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if (bsm_s == bsm_e && inb_s == inb_e && bsm_s != inb_s)
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return AVPROBE_SCORE_MAX / 2;
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}
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return 0;
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}
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static int aea_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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/* Parse the amount of channels and skip to pos 2048(0x800) */
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url_fskip(s->pb, 264);
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st->codec->channels = get_byte(s->pb);
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url_fskip(s->pb, 1783);
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_ATRAC1;
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st->codec->sample_rate = 44100;
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st->codec->bit_rate = 292000;
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if (st->codec->channels != 1 && st->codec->channels != 2) {
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av_log(s,AV_LOG_ERROR,"Channels %d not supported!\n",st->codec->channels);
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return -1;
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}
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st->codec->channel_layout = (st->codec->channels == 1) ? CH_LAYOUT_MONO : CH_LAYOUT_STEREO;
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st->codec->block_align = AT1_SU_SIZE * st->codec->channels;
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return 0;
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}
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static int aea_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
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pkt->stream_index = 0;
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if (ret <= 0)
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return AVERROR(EIO);
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return ret;
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}
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AVInputFormat aea_demuxer = {
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"aea",
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NULL_IF_CONFIG_SMALL("MD STUDIO audio"),
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0,
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aea_read_probe,
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aea_read_header,
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aea_read_packet,
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0,
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pcm_read_seek,
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.flags= AVFMT_GENERIC_INDEX,
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.extensions = "aea",
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};
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