1#	$OpenBSD: dolby,v 1.1 2004/06/03 03:14:19 tedu Exp $
2
3# ATSC A/53 aka AC-3 aka Dolby Digital <ashitaka@gmx.at>
4# from http://www.atsc.org/standards/a_52a.pdf
5# corrections, additions, etc. are always welcome!
6#
7# syncword
80       beshort         0x0b77  ATSC A/52 aka AC-3 aka Dolby Digital stream,
9# fscod
10>4      byte&0xc0       0x00    48 kHz,
11>4      byte&0xc0       0x40    44.1 kHz,
12>4      byte&0xc0       0x80    32 kHz,
13# is this one used for 96 kHz?
14>4      byte&0xc0       0xc0    reserved frequency,
15#
16>5	byte&7 = 0		\b, complete main (CM)
17>5	byte&7 = 1		\b, music and effects (ME)
18>5	byte&7 = 2		\b, visually impaired (VI)
19>5	byte&7 = 3		\b, hearing impaired (HI)
20>5	byte&7 = 4		\b, dialogue (D)
21>5	byte&7 = 5		\b, commentary (C)
22>5	byte&7 = 6		\b, emergency (E)
23# acmod
24>6      byte&0xe0       0x00    1+1 front,
25>6      byte&0xe0       0x20    1 front/0 rear,
26>6      byte&0xe0       0x40    2 front/0 rear,
27>6      byte&0xe0       0x60    3 front/0 rear,
28>6      byte&0xe0       0x80    2 front/1 rear,
29>6      byte&0xe0       0xa0    3 front/1 rear,
30>6      byte&0xe0       0xc0    2 front/2 rear,
31>6      byte&0xe0       0xe0    3 front/2 rear,
32# lfeon (these may be incorrect)
33>7      byte&0x40       0x00    LFE off,
34>7      byte&0x40       0x40    LFE on,
35#
36>4	byte&0x3e = 0x00	\b, 32 kbit/s
37>4	byte&0x3e = 0x02        \b, 40 kbit/s
38>4	byte&0x3e = 0x04        \b, 48 kbit/s
39>4	byte&0x3e = 0x06        \b, 56 kbit/s
40>4	byte&0x3e = 0x08        \b, 64 kbit/s
41>4	byte&0x3e = 0x0a        \b, 80 kbit/s
42>4	byte&0x3e = 0x0c        \b, 96 kbit/s
43>4	byte&0x3e = 0x0e        \b, 112 kbit/s
44>4	byte&0x3e = 0x10        \b, 128 kbit/s
45>4	byte&0x3e = 0x12        \b, 160 kbit/s
46>4	byte&0x3e = 0x14        \b, 192 kbit/s
47>4	byte&0x3e = 0x16        \b, 224 kbit/s
48>4	byte&0x3e = 0x18        \b, 256 kbit/s
49>4	byte&0x3e = 0x1a        \b, 320 kbit/s
50>4	byte&0x3e = 0x1c        \b, 384 kbit/s
51>4	byte&0x3e = 0x1e        \b, 448 kbit/s
52>4	byte&0x3e = 0x20        \b, 512 kbit/s
53>4	byte&0x3e = 0x22        \b, 576 kbit/s
54>4	byte&0x3e = 0x24        \b, 640 kbit/s
55# dsurmod (these may be incorrect)
56>6      beshort&0x0180  0x0000  Dolby Surround not indicated
57>6      beshort&0x0180  0x0080  not Dolby Surround encoded
58>6      beshort&0x0180  0x0100  Dolby Surround encoded
59>6      beshort&0x0180  0x0180  reserved Dolby Surround mode
60