xref: /freebsd/contrib/file/magic/Magdir/dolby (revision 48c779cdecb5f803e5fe5d761987e976ca9609db)
1
2#------------------------------------------------------------------------------
3# $File: dolby,v 1.9 2019/04/19 00:42:27 christos Exp $
4# ATSC A/53 aka AC-3 aka Dolby Digital <ashitaka@gmx.at>
5# from https://www.atsc.org/standards/a_52a.pdf
6# corrections, additions, etc. are always welcome!
7#
8# syncword
90	beshort		0x0b77	ATSC A/52 aka AC-3 aka Dolby Digital stream,
10# Proposed audio/ac3 RFC/4184
11!:mime	audio/vnd.dolby.dd-raw
12# fscod
13>4	byte&0xc0 = 0x00	48 kHz,
14>4	byte&0xc0 = 0x40	44.1 kHz,
15>4	byte&0xc0 = 0x80	32 kHz,
16# is this one used for 96 kHz?
17>4	byte&0xc0 = 0xc0	reserved frequency,
18#
19>5	byte&0x07 = 0x00	\b, complete main (CM)
20>5	byte&0x07 = 0x01	\b, music and effects (ME)
21>5	byte&0x07 = 0x02	\b, visually impaired (VI)
22>5	byte&0x07 = 0x03	\b, hearing impaired (HI)
23>5	byte&0x07 = 0x04	\b, dialogue (D)
24>5	byte&0x07 = 0x05	\b, commentary (C)
25>5	byte&0x07 = 0x06	\b, emergency (E)
26>5	beshort&0x07e0  0x0720	\b, voiceover (VO)
27>5	beshort&0x07e0 >0x0720	\b, karaoke
28# acmod
29>6	byte&0xe0 = 0x00	1+1 front,
30>>6	byte&0x10 = 0x10	LFE on,
31>6	byte&0xe0 = 0x20	1 front/0 rear,
32>>6	byte&0x10 = 0x10	LFE on,
33>6	byte&0xe0 = 0x40	2 front/0 rear,
34# dsurmod (for stereo only)
35>>6	byte&0x18 = 0x00	Dolby Surround not indicated
36>>6	byte&0x18 = 0x08	not Dolby Surround encoded
37>>6	byte&0x18 = 0x10	Dolby Surround encoded
38>>6	byte&0x18 = 0x18	reserved Dolby Surround mode
39>>6	byte&0x04 = 0x04	LFE on,
40>6	byte&0xe0 = 0x60	3 front/0 rear,
41>>6	byte&0x04 = 0x04	LFE on,
42>6	byte&0xe0 = 0x80	2 front/1 rear,
43>>6	byte&0x04 = 0x04	LFE on,
44>6	byte&0xe0 = 0xa0	3 front/1 rear,
45>>6	byte&0x01 = 0x01	LFE on,
46>6	byte&0xe0 = 0xc0	2 front/2 rear,
47>>6	byte&0x04 = 0x04	LFE on,
48>6	byte&0xe0 = 0xe0	3 front/2 rear,
49>>6	byte&0x01 = 0x01	LFE on,
50#
51>4	byte&0x3e = 0x00	\b, 32 kbit/s
52>4	byte&0x3e = 0x02	\b, 40 kbit/s
53>4	byte&0x3e = 0x04	\b, 48 kbit/s
54>4	byte&0x3e = 0x06	\b, 56 kbit/s
55>4	byte&0x3e = 0x08	\b, 64 kbit/s
56>4	byte&0x3e = 0x0a	\b, 80 kbit/s
57>4	byte&0x3e = 0x0c	\b, 96 kbit/s
58>4	byte&0x3e = 0x0e	\b, 112 kbit/s
59>4	byte&0x3e = 0x10	\b, 128 kbit/s
60>4	byte&0x3e = 0x12	\b, 160 kbit/s
61>4	byte&0x3e = 0x14	\b, 192 kbit/s
62>4	byte&0x3e = 0x16	\b, 224 kbit/s
63>4	byte&0x3e = 0x18	\b, 256 kbit/s
64>4	byte&0x3e = 0x1a	\b, 320 kbit/s
65>4	byte&0x3e = 0x1c	\b, 384 kbit/s
66>4	byte&0x3e = 0x1e	\b, 448 kbit/s
67>4	byte&0x3e = 0x20	\b, 512 kbit/s
68>4	byte&0x3e = 0x22	\b, 576 kbit/s
69>4	byte&0x3e = 0x24	\b, 640 kbit/s
70