1 /*
2 * Wideband Single-bit Data (WSD) 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/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/timecode.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "rawdec.h"
28
wsd_probe(const AVProbeData * p)29 static int wsd_probe(const AVProbeData *p)
30 {
31 if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) ||
32 !AV_RB32(p->buf + 36) || !p->buf[44] ||
33 (p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80)))
34 return 0;
35 return AVPROBE_SCORE_MAX;
36 }
37
empty_string(const char * buf,unsigned size)38 static int empty_string(const char *buf, unsigned size)
39 {
40 while (size--) {
41 if (*buf++ != ' ')
42 return 0;
43 }
44 return 1;
45 }
46
wsd_to_av_channel_layoyt(AVFormatContext * s,int bit)47 static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
48 {
49 switch (bit) {
50 case 2: return AV_CH_BACK_RIGHT;
51 case 3:
52 avpriv_request_sample(s, "Rr-middle");
53 break;
54 case 4: return AV_CH_BACK_CENTER;
55 case 5:
56 avpriv_request_sample(s, "Lr-middle");
57 break;
58 case 6: return AV_CH_BACK_LEFT;
59 case 24: return AV_CH_LOW_FREQUENCY;
60 case 26: return AV_CH_FRONT_RIGHT;
61 case 27: return AV_CH_FRONT_RIGHT_OF_CENTER;
62 case 28: return AV_CH_FRONT_CENTER;
63 case 29: return AV_CH_FRONT_LEFT_OF_CENTER;
64 case 30: return AV_CH_FRONT_LEFT;
65 default:
66 av_log(s, AV_LOG_WARNING, "reserved channel assignment\n");
67 break;
68 }
69 return 0;
70 }
71
get_metadata(AVFormatContext * s,const char * const tag,const unsigned size)72 static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
73 {
74 uint8_t *buf;
75 if (!(size + 1))
76 return AVERROR(ENOMEM);
77
78 buf = av_malloc(size + 1);
79 if (!buf)
80 return AVERROR(ENOMEM);
81
82 if (avio_read(s->pb, buf, size) != size) {
83 av_free(buf);
84 return AVERROR(EIO);
85 }
86
87 if (empty_string(buf, size)) {
88 av_free(buf);
89 return 0;
90 }
91
92 buf[size] = 0;
93 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
94 return 0;
95 }
96
wsd_read_header(AVFormatContext * s)97 static int wsd_read_header(AVFormatContext *s)
98 {
99 AVIOContext *pb = s->pb;
100 AVStream *st;
101 int version;
102 uint32_t text_offset, data_offset, channel_assign;
103 char playback_time[AV_TIMECODE_STR_SIZE];
104
105 st = avformat_new_stream(s, NULL);
106 if (!st)
107 return AVERROR(ENOMEM);
108
109 avio_skip(pb, 8);
110 version = avio_r8(pb);
111 av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF);
112 avio_skip(pb, 11);
113
114 if (version < 0x10) {
115 text_offset = 0x80;
116 data_offset = 0x800;
117 avio_skip(pb, 8);
118 } else {
119 text_offset = avio_rb32(pb);
120 data_offset = avio_rb32(pb);
121 }
122
123 avio_skip(pb, 4);
124 av_timecode_make_smpte_tc_string2(playback_time, (AVRational){1,1}, avio_rb32(pb) & 0x00ffffffU, 1, 1);
125 av_dict_set(&s->metadata, "playback_time", playback_time, 0);
126
127 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
128 st->codecpar->codec_id = s->iformat->raw_codec_id;
129 st->codecpar->sample_rate = avio_rb32(pb) / 8;
130 avio_skip(pb, 4);
131 st->codecpar->ch_layout.nb_channels = avio_r8(pb) & 0xF;
132 st->codecpar->bit_rate = (int64_t)st->codecpar->ch_layout.nb_channels *
133 st->codecpar->sample_rate * 8LL;
134 if (!st->codecpar->ch_layout.nb_channels)
135 return AVERROR_INVALIDDATA;
136
137 avio_skip(pb, 3);
138 channel_assign = avio_rb32(pb);
139 if (!(channel_assign & 1)) {
140 uint64_t ch_mask = 0;
141 int i;
142 for (i = 1; i < 32; i++)
143 if ((channel_assign >> i) & 1)
144 ch_mask |= wsd_to_av_channel_layoyt(s, i);
145 av_channel_layout_from_mask(&st->codecpar->ch_layout, ch_mask);
146 }
147
148 avio_skip(pb, 16);
149 if (avio_rb32(pb))
150 avpriv_request_sample(s, "emphasis");
151
152 if (avio_seek(pb, text_offset, SEEK_SET) >= 0) {
153 get_metadata(s, "title", 128);
154 get_metadata(s, "composer", 128);
155 get_metadata(s, "song_writer", 128);
156 get_metadata(s, "artist", 128);
157 get_metadata(s, "album", 128);
158 get_metadata(s, "genre", 32);
159 get_metadata(s, "date", 32);
160 get_metadata(s, "location", 32);
161 get_metadata(s, "comment", 512);
162 get_metadata(s, "user", 512);
163 }
164
165 return avio_seek(pb, data_offset, SEEK_SET);
166 }
167
168 const AVInputFormat ff_wsd_demuxer = {
169 .name = "wsd",
170 .long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
171 .read_probe = wsd_probe,
172 .read_header = wsd_read_header,
173 .read_packet = ff_raw_read_partial_packet,
174 .extensions = "wsd",
175 .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
176 .raw_codec_id = AV_CODEC_ID_DSD_MSBF,
177 .priv_data_size = sizeof(FFRawDemuxerContext),
178 .priv_class = &ff_raw_demuxer_class,
179 };
180