path: root/libavformat/dsfdec.c (plain)
blob: 49ca33642749296c49264b7813996e7ad1b07460

1	/*
2	* DSD Stream File (DSF) demuxer
3	* Copyright (c) 2014 Peter Ross
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	#include "id3v2.h"
26
27	typedef struct {
28	uint64_t data_end;
29	} DSFContext;
30
31	static int dsf_probe(AVProbeData *p)
32	{
33	if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
34	return 0;
35	return AVPROBE_SCORE_MAX;
36	}
37
38	static const uint64_t dsf_channel_layout[] = {
39	0,
40	AV_CH_LAYOUT_MONO,
41	AV_CH_LAYOUT_STEREO,
42	AV_CH_LAYOUT_SURROUND,
43	AV_CH_LAYOUT_QUAD,
44	AV_CH_LAYOUT_4POINT0,
45	AV_CH_LAYOUT_5POINT0_BACK,
46	AV_CH_LAYOUT_5POINT1_BACK,
47	};
48
49	static void read_id3(AVFormatContext *s, uint64_t id3pos)
50	{
51	ID3v2ExtraMeta *id3v2_extra_meta = NULL;
52	if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
53	return;
54
55	ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
56	if (id3v2_extra_meta)
57	ff_id3v2_parse_apic(s, &id3v2_extra_meta);
58	ff_id3v2_free_extra_meta(&id3v2_extra_meta);
59	}
60
61	static int dsf_read_header(AVFormatContext *s)
62	{
63	DSFContext *dsf = s->priv_data;
64	AVIOContext *pb = s->pb;
65	AVStream *st;
66	uint64_t id3pos;
67	unsigned int channel_type;
68
69	avio_skip(pb, 4);
70	if (avio_rl64(pb) != 28)
71	return AVERROR_INVALIDDATA;
72
73	/* create primary stream before any id3 coverart streams */
74	st = avformat_new_stream(s, NULL);
75	if (!st)
76	return AVERROR(ENOMEM);
77
78	avio_skip(pb, 8);
79	id3pos = avio_rl64(pb);
80	if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
81	read_id3(s, id3pos);
82	avio_seek(pb, 28, SEEK_SET);
83	}
84
85	/* fmt chunk */
86
87	if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
88	return AVERROR_INVALIDDATA;
89
90	if (avio_rl32(pb) != 1) {
91	avpriv_request_sample(s, "unknown format version");
92	return AVERROR_INVALIDDATA;
93	}
94
95	if (avio_rl32(pb)) {
96	avpriv_request_sample(s, "unknown format id");
97	return AVERROR_INVALIDDATA;
98	}
99
100	channel_type = avio_rl32(pb);
101	if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
102	st->codecpar->channel_layout = dsf_channel_layout[channel_type];
103	if (!st->codecpar->channel_layout)
104	avpriv_request_sample(s, "channel type %i", channel_type);
105
106	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
107	st->codecpar->channels = avio_rl32(pb);
108	st->codecpar->sample_rate = avio_rl32(pb) / 8;
109
110	if (st->codecpar->channels <= 0)
111	return AVERROR_INVALIDDATA;
112
113	switch(avio_rl32(pb)) {
114	case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
115	case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
116	default:
117	avpriv_request_sample(s, "unknown most significant bit");
118	return AVERROR_INVALIDDATA;
119	}
120
121	avio_skip(pb, 8);
122	st->codecpar->block_align = avio_rl32(pb);
123	if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {
124	avpriv_request_sample(s, "block_align overflow");
125	return AVERROR_INVALIDDATA;
126	}
127	st->codecpar->block_align *= st->codecpar->channels;
128	st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * 8LL;
129	avio_skip(pb, 4);
130
131	/* data chunk */
132
133	dsf->data_end = avio_tell(pb);
134	if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
135	return AVERROR_INVALIDDATA;
136	dsf->data_end += avio_rl64(pb);
137
138	return 0;
139	}
140
141	static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
142	{
143	DSFContext *dsf = s->priv_data;
144	AVIOContext *pb = s->pb;
145	AVStream *st = s->streams[0];
146	int64_t pos = avio_tell(pb);
147
148	if (pos >= dsf->data_end)
149	return AVERROR_EOF;
150
151	pkt->stream_index = 0;
152	return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
153	}
154
155	AVInputFormat ff_dsf_demuxer = {
156	.name = "dsf",
157	.long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
158	.priv_data_size = sizeof(DSFContext),
159	.read_probe = dsf_probe,
160	.read_header = dsf_read_header,
161	.read_packet = dsf_read_packet,
162	.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
163	};
164