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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) { | |
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->codec->channel_layout = dsf_channel_layout[channel_type]; | |
103 | if (!st->codec->channel_layout) | |
104 | avpriv_request_sample(s, "channel type %i", channel_type); | |
105 | ||
106 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
107 | st->codec->channels = avio_rl32(pb); | |
108 | st->codec->sample_rate = avio_rl32(pb) / 8; | |
109 | ||
110 | switch(avio_rl32(pb)) { | |
111 | case 1: st->codec->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break; | |
112 | case 8: st->codec->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break; | |
113 | default: | |
114 | avpriv_request_sample(s, "unknown most significant bit"); | |
115 | return AVERROR_INVALIDDATA; | |
116 | } | |
117 | ||
118 | avio_skip(pb, 8); | |
119 | st->codec->block_align = avio_rl32(pb); | |
120 | if (st->codec->block_align > INT_MAX / st->codec->channels) { | |
121 | avpriv_request_sample(s, "block_align overflow"); | |
122 | return AVERROR_INVALIDDATA; | |
123 | } | |
124 | st->codec->block_align *= st->codec->channels; | |
125 | avio_skip(pb, 4); | |
126 | ||
127 | /* data chunk */ | |
128 | ||
129 | dsf->data_end = avio_tell(pb); | |
130 | if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a')) | |
131 | return AVERROR_INVALIDDATA; | |
132 | dsf->data_end += avio_rl64(pb); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt) | |
138 | { | |
139 | DSFContext *dsf = s->priv_data; | |
140 | AVIOContext *pb = s->pb; | |
141 | AVStream *st = s->streams[0]; | |
142 | int64_t pos = avio_tell(pb); | |
143 | ||
144 | if (pos >= dsf->data_end) | |
145 | return AVERROR_EOF; | |
146 | ||
147 | pkt->stream_index = 0; | |
148 | return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codec->block_align)); | |
149 | } | |
150 | ||
151 | AVInputFormat ff_dsf_demuxer = { | |
152 | .name = "dsf", | |
153 | .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"), | |
154 | .priv_data_size = sizeof(DSFContext), | |
155 | .read_probe = dsf_probe, | |
156 | .read_header = dsf_read_header, | |
157 | .read_packet = dsf_read_packet, | |
158 | .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK, | |
159 | }; |