3 * Copyright (c) 2015 Paul B Mahol
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
26 typedef struct VPKDemuxContext {
28 unsigned current_block;
29 unsigned last_block_size;
32 static int vpk_probe(AVProbeData *p)
34 if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
37 return AVPROBE_SCORE_MAX / 3 * 2;
40 static int vpk_read_header(AVFormatContext *s)
42 VPKDemuxContext *vpk = s->priv_data;
44 unsigned samples_per_block;
47 vpk->current_block = 0;
48 st = avformat_new_stream(s, NULL);
50 return AVERROR(ENOMEM);
53 st->duration = avio_rl32(s->pb) * 28 / 16;
54 offset = avio_rl32(s->pb);
55 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
56 st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX;
57 st->codec->block_align = avio_rl32(s->pb);
58 st->codec->sample_rate = avio_rl32(s->pb);
59 if (st->codec->sample_rate <= 0)
60 return AVERROR_INVALIDDATA;
61 st->codec->channels = avio_rl32(s->pb);
62 if (st->codec->channels <= 0)
63 return AVERROR_INVALIDDATA;
64 samples_per_block = ((st->codec->block_align / st->codec->channels) * 28) / 16;
65 if (samples_per_block <= 0)
66 return AVERROR_INVALIDDATA;
67 vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;
68 vpk->last_block_size = (st->duration % samples_per_block) * 16 * st->codec->channels / 28;
69 avio_skip(s->pb, offset - avio_tell(s->pb));
70 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
75 static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
77 AVCodecContext *codec = s->streams[0]->codec;
78 VPKDemuxContext *vpk = s->priv_data;
82 if (vpk->current_block == vpk->block_count) {
83 unsigned size = vpk->last_block_size / codec->channels;
84 unsigned skip = (codec->block_align - vpk->last_block_size) / codec->channels;
86 ret = av_new_packet(pkt, vpk->last_block_size);
89 for (i = 0; i < codec->channels; i++) {
90 ret = avio_read(s->pb, pkt->data + i * size, size);
91 avio_skip(s->pb, skip);
98 pkt->stream_index = 0;
99 } else if (vpk->current_block < vpk->block_count) {
100 ret = av_get_packet(s->pb, pkt, codec->block_align);
101 pkt->stream_index = 0;
109 AVInputFormat ff_vpk_demuxer = {
111 .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
112 .priv_data_size = sizeof(VPKDemuxContext),
113 .read_probe = vpk_probe,
114 .read_header = vpk_read_header,
115 .read_packet = vpk_read_packet,