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