aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* XVAG demuxer
* Copyright (c) 2015 Paul B Mahol
*
* 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/bswap.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "internal.h"
static int xvag_probe(const AVProbeData *p)
{
if (memcmp(p->buf, "XVAG", 4) ||
memcmp(p->buf+32, "fmat", 4))
return 0;
return AVPROBE_SCORE_MAX;
}
static int xvag_read_header(AVFormatContext *s)
{
unsigned offset, big_endian, codec;
AVStream *st;
avio_skip(s->pb, 4);
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
offset = avio_rl32(s->pb);
big_endian = offset > av_bswap32(offset);
if (big_endian) {
offset = av_bswap32(offset);
avio_skip(s->pb, 28);
codec = avio_rb32(s->pb);
st->codecpar->channels = avio_rb32(s->pb);
avio_skip(s->pb, 4);
st->duration = avio_rb32(s->pb);
avio_skip(s->pb, 8);
st->codecpar->sample_rate = avio_rb32(s->pb);
} else {
avio_skip(s->pb, 28);
codec = avio_rl32(s->pb);
st->codecpar->channels = avio_rl32(s->pb);
avio_skip(s->pb, 4);
st->duration = avio_rl32(s->pb);
avio_skip(s->pb, 8);
st->codecpar->sample_rate = avio_rl32(s->pb);
}
if (st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
return AVERROR_INVALIDDATA;
switch (codec) {
case 0x1c:
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->block_align = 16 * st->codecpar->channels;
break;
default:
avpriv_request_sample(s, "codec %X", codec);
return AVERROR_PATCHWELCOME;
};
avio_skip(s->pb, offset - avio_tell(s->pb));
if (avio_rb16(s->pb) == 0xFFFB) {
st->codecpar->codec_id = AV_CODEC_ID_MP3;
st->codecpar->block_align = 0x1000;
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
}
avio_skip(s->pb, -2);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
return av_get_packet(s->pb, pkt, par->block_align);
}
AVInputFormat ff_xvag_demuxer = {
.name = "xvag",
.long_name = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"),
.read_probe = xvag_probe,
.read_header = xvag_read_header,
.read_packet = xvag_read_packet,
.extensions = "xvag",
};
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