path: root/libavformat/vpk.c (plain)
blob: bb9eabb2ba25827153f5b44bf0f0f386b9e8453b

1	/*
2	* VPK demuxer
3	* Copyright (c) 2015 Paul B Mahol
4	*
5	* This file is part of FFmpeg.
6	*
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.
11	*
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.
16	*
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
20	*/
21
22	#include "libavutil/intreadwrite.h"
23	#include "avformat.h"
24	#include "internal.h"
25
26	typedef struct VPKDemuxContext {
27	unsigned block_count;
28	unsigned current_block;
29	unsigned last_block_size;
30	} VPKDemuxContext;
31
32	static int vpk_probe(AVProbeData *p)
33	{
34	if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
35	return 0;
36
37	return AVPROBE_SCORE_MAX / 3 * 2;
38	}
39
40	static int vpk_read_header(AVFormatContext *s)
41	{
42	VPKDemuxContext *vpk = s->priv_data;
43	unsigned offset;
44	unsigned samples_per_block;
45	AVStream *st;
46
47	vpk->current_block = 0;
48	st = avformat_new_stream(s, NULL);
49	if (!st)
50	return AVERROR(ENOMEM);
51
52	avio_skip(s->pb, 4);
53	st->duration = avio_rl32(s->pb) * 28 / 16;
54	offset = avio_rl32(s->pb);
55	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
56	st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
57	st->codecpar->block_align = avio_rl32(s->pb);
58	st->codecpar->sample_rate = avio_rl32(s->pb);
59	if (st->codecpar->sample_rate <= 0)
60	return AVERROR_INVALIDDATA;
61	st->codecpar->channels = avio_rl32(s->pb);
62	if (st->codecpar->channels <= 0)
63	return AVERROR_INVALIDDATA;
64	samples_per_block = ((st->codecpar->block_align / st->codecpar->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->codecpar->channels / 28;
69	avio_skip(s->pb, offset - avio_tell(s->pb));
70	avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
71
72	return 0;
73	}
74
75	static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
76	{
77	AVCodecParameters *par = s->streams[0]->codecpar;
78	VPKDemuxContext *vpk = s->priv_data;
79	int ret, i;
80
81	vpk->current_block++;
82	if (vpk->current_block == vpk->block_count) {
83	unsigned size = vpk->last_block_size / par->channels;
84	unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
85
86	ret = av_new_packet(pkt, vpk->last_block_size);
87	if (ret < 0)
88	return ret;
89	for (i = 0; i < par->channels; i++) {
90	ret = avio_read(s->pb, pkt->data + i * size, size);
91	avio_skip(s->pb, skip);
92	if (ret != size) {
93	av_packet_unref(pkt);
94	ret = AVERROR(EIO);
95	break;
96	}
97	}
98	pkt->stream_index = 0;
99	} else if (vpk->current_block < vpk->block_count) {
100	ret = av_get_packet(s->pb, pkt, par->block_align);
101	pkt->stream_index = 0;
102	} else {
103	return AVERROR_EOF;
104	}
105
106	return ret;
107	}
108
109	AVInputFormat ff_vpk_demuxer = {
110	.name = "vpk",
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,
116	.extensions = "vpk",
117	};
118