S/PDIF C Channel Information

Byte 0

Bit 0: 0: S/PDIF
       1: AES/EBU (ignored by consumer equipment)

Bit 1: 0: Digital Audio
       1: Non-audio (ignored by consumer audio equipment)

Bit 2: 0: SCMS enabled (default state)
       1: SCMS disabled (this allows unlimited generation digital copying)
       Alternating at 4-10Hz and Category 1000000 (CD):
          CD is copy of an original work - disallow recording

5  4  3 Preemphasis
-----------------------------------
0  0  0 None - 2 channel audio
0  0  1 50/15us - 2 channel audio
0  1  0 Reserved - 2 channel audio
0  1  1 Reserved - 2 channel audio
1  -  - Reserved - 4 channel audio

7  6  Mode
------------
0  0  Mode 0
--  -  Reserved

Mode defines the meaning of bytes 1 to 3. It is likely the other modes would
be rejected by consumer audio equipment.


Byte 1 - Category codes, and 'L' generation bit

8  9 10 11 12 13 14 Hex   Category
--------------------------------------------------------------------------------
0  0  0  0  -  -  - 00-0F Reserved
0  0  0  0  0  0  0 00    General
0  0  0  0  0  0  1 02    Experimental
0  0  0  1  -  -  - 10-1F Solid state memory [Do MPMans have S/PDIF out?]
0  0  1  -  -  -  - 20-3F Broadcast digital audio
0  0  1  0  0  0  0 20      - Japan
0  0  1  0  0  0  1 22      - Electronic software delivery
0  0  1  0  0  1  1 26      - United States
0  0  1  1  0  0  0 30      - Europe
0  1  0  -  -  -  - 40-5F Digital / digital converter
0  1  0  0  0  0  0 40    PCM encoder / decoder
0  1  0  0  0  1  0 44    Digital sound sampler
0  1  0  0  1  0  0 48    Digital signal mixer
0  1  0  1  1  0  0 58    Sample rate converter
0  1  1  0  0  -  - 60-67 A/D converter without SCMS
0  1  1  0  1  -  - 68-6F A/D converter with SCMS
0  1  1  1  -  -  - 70-7F Broadcast digital audio
1  0  0  -  -  -  - 80-9F Laser optical
1  0  0  0  0  0  0 80    CD - compatible with IEC908
1  0  0  1  0  0  0 90    CD - IEC908 incomp. (Mag/Opt) [is this CD-RW?]
1  0  0  1  0  0  1 92    MiniDisc
1  0  1  -  -  -  - A0-BF Musical instruments, microphones
1  0  1  0  0  0  0 A0    Synthesiser
1  0  1  1  0  0  0 B0    Microphone
1  1  0  -  -  -  - C0-DF Magnetic tape or disc
1  1  0  0  0  0  0 C0    DAT
1  1  0  0  0  0  1 C2    DCC
1  1  0  1  0  0  0 D0    Digital audio sound VCR
1  1  1  -  -  -  - E0-FF Reserved

For categories 001---- (broadcast), 0111---- (broadcast) and 100---- (laser optical):
bit 15=0: Original / Commercially pre-recorded data
bit 15=1: No indication / 1st generation or higher

For the other categories
bit 15=0: No indication / 1st generation or higher
bit 15=1: Original / Commercially pre-recorded data

Byte 2: Source and channel

19 18 17 16 Source
-------------------------------
 0  0  0  0 Unspecified source
 0  0  0  1 Source 1
 0  0  1  0 Source 2
 :  :  :  :  :
 1  1  1  1 Source 15

23 22 21 20 Channel
--------------------------------------------------
 0  0  0  0 Unspecified channel
 0  0  0  1 Channel A (Left in 2 channel format)
 0  0  1  0 Channel B (Right in 2 channel format)
 0  0  1  1 Channel C
 :  :  :  :  :
 1  1  1  1 Channel O

Byte 3: Sample rate

27 26 25 24 Sample frequency Fs
-------------------------------------------
 0  0  0  0 44.1kHz
 0  0  1  0 48kHz
 0  0  1  1 32kHz or sample rate converter
 -  -  -  - Reserved

29 28 Clock accuracy
---------------------------------
 0  0 +/- 0.1% (default)
 0  1 +/- 0.005% (high accuracy)
 1  0 Variable pitch
 1  1 Reserved

Bits 30 and 31 are reserved

Bytes 4-23 are reserved
Most of this information was gathered from Application note AN22 (pdf format) from Crystal Semiconductor: www.crystal.com

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