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 uint64_t audio_size;
30 uint64_t data_size;
31 } DSFContext;
32
dsf_probe(const AVProbeData * p)33 static int dsf_probe(const AVProbeData *p)
34 {
35 if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
36 return 0;
37 return AVPROBE_SCORE_MAX;
38 }
39
40 static const uint64_t dsf_channel_layout[] = {
41 0,
42 AV_CH_LAYOUT_MONO,
43 AV_CH_LAYOUT_STEREO,
44 AV_CH_LAYOUT_SURROUND,
45 AV_CH_LAYOUT_QUAD,
46 AV_CH_LAYOUT_4POINT0,
47 AV_CH_LAYOUT_5POINT0_BACK,
48 AV_CH_LAYOUT_5POINT1_BACK,
49 };
50
read_id3(AVFormatContext * s,uint64_t id3pos)51 static void read_id3(AVFormatContext *s, uint64_t id3pos)
52 {
53 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
54 if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
55 return;
56
57 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
58 if (id3v2_extra_meta) {
59 ff_id3v2_parse_apic(s, id3v2_extra_meta);
60 ff_id3v2_parse_chapters(s, id3v2_extra_meta);
61 }
62 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
63 }
64
dsf_read_header(AVFormatContext * s)65 static int dsf_read_header(AVFormatContext *s)
66 {
67 DSFContext *dsf = s->priv_data;
68 AVIOContext *pb = s->pb;
69 AVStream *st;
70 uint64_t id3pos;
71 unsigned int channel_type;
72
73 avio_skip(pb, 4);
74 if (avio_rl64(pb) != 28)
75 return AVERROR_INVALIDDATA;
76
77 /* create primary stream before any id3 coverart streams */
78 st = avformat_new_stream(s, NULL);
79 if (!st)
80 return AVERROR(ENOMEM);
81
82 avio_skip(pb, 8);
83 id3pos = avio_rl64(pb);
84 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
85 read_id3(s, id3pos);
86 avio_seek(pb, 28, SEEK_SET);
87 }
88
89 /* fmt chunk */
90
91 if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
92 return AVERROR_INVALIDDATA;
93
94 if (avio_rl32(pb) != 1) {
95 avpriv_request_sample(s, "unknown format version");
96 return AVERROR_INVALIDDATA;
97 }
98
99 if (avio_rl32(pb)) {
100 avpriv_request_sample(s, "unknown format id");
101 return AVERROR_INVALIDDATA;
102 }
103
104 channel_type = avio_rl32(pb);
105 if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))
106 st->codecpar->channel_layout = dsf_channel_layout[channel_type];
107 if (!st->codecpar->channel_layout)
108 avpriv_request_sample(s, "channel type %i", channel_type);
109
110 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
111 st->codecpar->channels = avio_rl32(pb);
112 st->codecpar->sample_rate = avio_rl32(pb) / 8;
113
114 if (st->codecpar->channels <= 0)
115 return AVERROR_INVALIDDATA;
116
117 switch(avio_rl32(pb)) {
118 case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
119 case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
120 default:
121 avpriv_request_sample(s, "unknown most significant bit");
122 return AVERROR_INVALIDDATA;
123 }
124
125 dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->channels;
126 st->codecpar->block_align = avio_rl32(pb);
127 if (st->codecpar->block_align > INT_MAX / st->codecpar->channels || st->codecpar->block_align <= 0) {
128 avpriv_request_sample(s, "block_align invalid");
129 return AVERROR_INVALIDDATA;
130 }
131 st->codecpar->block_align *= st->codecpar->channels;
132 st->codecpar->bit_rate = st->codecpar->channels * 8LL * st->codecpar->sample_rate;
133 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
134 avio_skip(pb, 4);
135
136 /* data chunk */
137
138 dsf->data_end = avio_tell(pb);
139 if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))
140 return AVERROR_INVALIDDATA;
141 dsf->data_size = avio_rl64(pb) - 12;
142 dsf->data_end += dsf->data_size + 12;
143 s->internal->data_offset = avio_tell(pb);
144
145 return 0;
146 }
147
dsf_read_packet(AVFormatContext * s,AVPacket * pkt)148 static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
149 {
150 DSFContext *dsf = s->priv_data;
151 AVIOContext *pb = s->pb;
152 AVStream *st = s->streams[0];
153 int64_t pos = avio_tell(pb);
154 int ret;
155
156 if (pos >= dsf->data_end)
157 return AVERROR_EOF;
158
159 if (dsf->data_size > dsf->audio_size) {
160 int last_packet = pos == (dsf->data_end - st->codecpar->block_align);
161
162 if (last_packet) {
163 int64_t data_pos = pos - s->internal->data_offset;
164 int64_t packet_size = dsf->audio_size - data_pos;
165 int64_t skip_size = dsf->data_size - data_pos - packet_size;
166 uint8_t *dst;
167 int ch, ret;
168
169 if (packet_size <= 0 || skip_size <= 0)
170 return AVERROR_INVALIDDATA;
171
172 if ((ret = av_new_packet(pkt, packet_size)) < 0)
173 return ret;
174 dst = pkt->data;
175 for (ch = 0; ch < st->codecpar->channels; ch++) {
176 ret = avio_read(pb, dst, packet_size / st->codecpar->channels);
177 if (ret < packet_size / st->codecpar->channels)
178 return AVERROR_EOF;
179
180 dst += ret;
181 avio_skip(pb, skip_size / st->codecpar->channels);
182 }
183
184 pkt->pos = pos;
185 pkt->stream_index = 0;
186 pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
187 pkt->duration = packet_size / st->codecpar->channels;
188 return 0;
189 }
190 }
191 ret = av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
192 if (ret < 0)
193 return ret;
194
195 pkt->stream_index = 0;
196 pkt->pts = (pos - s->internal->data_offset) / st->codecpar->channels;
197 pkt->duration = st->codecpar->block_align / st->codecpar->channels;
198
199 return 0;
200 }
201
202 AVInputFormat ff_dsf_demuxer = {
203 .name = "dsf",
204 .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),
205 .priv_data_size = sizeof(DSFContext),
206 .read_probe = dsf_probe,
207 .read_header = dsf_read_header,
208 .read_packet = dsf_read_packet,
209 .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
210 };
211