aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* VPK 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/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
typedef struct VPKDemuxContext {
unsigned block_count;
unsigned current_block;
unsigned last_block_size;
} VPKDemuxContext;
static int vpk_probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
return 0;
return AVPROBE_SCORE_MAX / 3 * 2;
}
static int vpk_read_header(AVFormatContext *s)
{
VPKDemuxContext *vpk = s->priv_data;
unsigned offset;
unsigned samples_per_block;
AVStream *st;
vpk->current_block = 0;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avio_skip(s->pb, 4);
st->duration = avio_rl32(s->pb) * 28 / 16;
offset = avio_rl32(s->pb);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->block_align = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);
if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
return AVERROR_INVALIDDATA;
st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels <= 0)
return AVERROR_INVALIDDATA;
samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
if (samples_per_block <= 0)
return AVERROR_INVALIDDATA;
vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;
vpk->last_block_size = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
if (offset < avio_tell(s->pb))
return AVERROR_INVALIDDATA;
avio_skip(s->pb, offset - avio_tell(s->pb));
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
VPKDemuxContext *vpk = s->priv_data;
int ret, i;
vpk->current_block++;
if (vpk->current_block == vpk->block_count) {
unsigned size = vpk->last_block_size / par->channels;
unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
ret = av_new_packet(pkt, vpk->last_block_size);
if (ret < 0)
return ret;
for (i = 0; i < par->channels; i++) {
ret = avio_read(s->pb, pkt->data + i * size, size);
avio_skip(s->pb, skip);
if (ret != size) {
av_packet_unref(pkt);
ret = AVERROR(EIO);
break;
}
}
pkt->stream_index = 0;
} else if (vpk->current_block < vpk->block_count) {
ret = av_get_packet(s->pb, pkt, par->block_align);
pkt->stream_index = 0;
} else {
return AVERROR_EOF;
}
return ret;
}
AVInputFormat ff_vpk_demuxer = {
.name = "vpk",
.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
.priv_data_size = sizeof(VPKDemuxContext),
.read_probe = vpk_probe,
.read_header = vpk_read_header,
.read_packet = vpk_read_packet,
.extensions = "vpk",
};
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