2 * DSD Stream File (DSF) demuxer
3 * Copyright (c) 2014 Peter Ross
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"
31 static int dsf_probe(AVProbeData *p)
33 if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)
35 return AVPROBE_SCORE_MAX;
38 static const uint64_t dsf_channel_layout[] = {
42 AV_CH_LAYOUT_SURROUND,
45 AV_CH_LAYOUT_5POINT0_BACK,
46 AV_CH_LAYOUT_5POINT1_BACK,
49 static void read_id3(AVFormatContext *s, uint64_t id3pos)
51 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
52 if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
55 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
57 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
58 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
61 static int dsf_read_header(AVFormatContext *s)
63 DSFContext *dsf = s->priv_data;
64 AVIOContext *pb = s->pb;
67 unsigned int channel_type;
70 if (avio_rl64(pb) != 28)
71 return AVERROR_INVALIDDATA;
73 /* create primary stream before any id3 coverart streams */
74 st = avformat_new_stream(s, NULL);
76 return AVERROR(ENOMEM);
79 id3pos = avio_rl64(pb);
82 avio_seek(pb, 28, SEEK_SET);
87 if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)
88 return AVERROR_INVALIDDATA;
90 if (avio_rl32(pb) != 1) {
91 avpriv_request_sample(s, "unknown format version");
92 return AVERROR_INVALIDDATA;
96 avpriv_request_sample(s, "unknown format id");
97 return AVERROR_INVALIDDATA;
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);
106 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
107 st->codecpar->channels = avio_rl32(pb);
108 st->codecpar->sample_rate = avio_rl32(pb) / 8;
110 switch(avio_rl32(pb)) {
111 case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;
112 case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;
114 avpriv_request_sample(s, "unknown most significant bit");
115 return AVERROR_INVALIDDATA;
119 st->codecpar->block_align = avio_rl32(pb);
120 if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {
121 avpriv_request_sample(s, "block_align overflow");
122 return AVERROR_INVALIDDATA;
124 st->codecpar->block_align *= st->codecpar->channels;
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);
137 static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt)
139 DSFContext *dsf = s->priv_data;
140 AVIOContext *pb = s->pb;
141 AVStream *st = s->streams[0];
142 int64_t pos = avio_tell(pb);
144 if (pos >= dsf->data_end)
147 pkt->stream_index = 0;
148 return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));
151 AVInputFormat ff_dsf_demuxer = {
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,