143 lines
4.6 KiB
C
Executable file
143 lines
4.6 KiB
C
Executable file
/*
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* VPK demuxer
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* Copyright (c) 2015 Paul B Mahol
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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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typedef struct VPKDemuxContext {
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unsigned data_start;
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unsigned block_count;
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unsigned current_block;
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unsigned last_block_size;
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} VPKDemuxContext;
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static int vpk_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
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return 0;
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return AVPROBE_SCORE_MAX / 3 * 2;
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}
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static int vpk_read_header(AVFormatContext *s)
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{
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VPKDemuxContext *vpk = s->priv_data;
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unsigned offset;
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unsigned samples_per_block;
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AVStream *st;
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vpk->current_block = 0;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(s->pb, 4);
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st->duration = avio_rl32(s->pb) * 28 / 16;
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offset = avio_rl32(s->pb);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
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st->codecpar->block_align = avio_rl32(s->pb);
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st->codecpar->sample_rate = avio_rl32(s->pb);
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if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
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return AVERROR_INVALIDDATA;
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st->codecpar->channels = avio_rl32(s->pb);
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if (st->codecpar->channels <= 0)
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return AVERROR_INVALIDDATA;
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samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
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if (samples_per_block <= 0)
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return AVERROR_INVALIDDATA;
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vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;
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vpk->last_block_size = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
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if (offset < avio_tell(s->pb))
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, offset - avio_tell(s->pb));
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vpk->data_start = offset;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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VPKDemuxContext *vpk = s->priv_data;
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int ret, i;
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vpk->current_block++;
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if (vpk->current_block == vpk->block_count) {
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unsigned size = vpk->last_block_size / par->channels;
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unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
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uint64_t pos = avio_tell(s->pb);
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ret = av_new_packet(pkt, vpk->last_block_size);
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if (ret < 0)
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return ret;
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for (i = 0; i < par->channels; i++) {
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ret = avio_read(s->pb, pkt->data + i * size, size);
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avio_skip(s->pb, skip);
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if (ret != size) {
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return AVERROR(EIO);
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}
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}
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pkt->pos = pos;
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pkt->stream_index = 0;
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} else if (vpk->current_block < vpk->block_count) {
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ret = av_get_packet(s->pb, pkt, par->block_align);
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pkt->stream_index = 0;
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} else {
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return AVERROR_EOF;
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}
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return ret;
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}
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static int vpk_read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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AVStream *st = s->streams[stream_index];
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AVCodecParameters *par = st->codecpar;
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VPKDemuxContext *vpk = s->priv_data;
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int samples_per_block;
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int64_t ret = 0;
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samples_per_block = av_get_audio_frame_duration2(par, par->block_align);
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timestamp /= samples_per_block;
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ret = avio_seek(s->pb, vpk->data_start + timestamp * par->block_align, SEEK_SET);
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if (ret < 0)
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return ret;
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vpk->current_block = timestamp;
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ff_update_cur_dts(s, st, timestamp * samples_per_block);
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return 0;
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}
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AVInputFormat ff_vpk_demuxer = {
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.name = "vpk",
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.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
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.priv_data_size = sizeof(VPKDemuxContext),
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.read_probe = vpk_probe,
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.read_header = vpk_read_header,
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.read_packet = vpk_read_packet,
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.read_seek = vpk_read_seek,
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.extensions = "vpk",
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};
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