XA Subheader information

XA Subheader Information
========================

XA subheader information is 8 bytes, 2 blocks of 4 bytes, each block being identical.

Byte Offset
0		file number
1		channel number
2		submode
3		coding info
4		file number
5		channel number
6		submode
7		coding info

Byte 0, File Number
=============
0		standard data file
1-255		interleaved

Byte 1, Channel Number
======================
0-15		ADPCM
0-31		Data/Video
ADPCM data can only be up to 16 channels, this would be reduced to 8 if the PlayStation didn't have double speed CD-ROM access

Byte 2, Submode
===============
Split into 8 bits:
Bit#		Field 			Description
7		EOF			set at end of file
6		Real time sector
5		Form
4		Trigger			for use with application
3		Data			set if data sector
2		Audio			set if audio sector
1		Video			set if video sector
0		EOR			end of record

Byte 3, Coding Information
==========================
Split into 8 bits:
Bit#		Field 			Description
7		Reserved		0
6		Emphasis		emphasis
5,4		Bits per sample		00 = 4bit (level B/C)
					01 = 8bit (level A)
3,2		Sample rate		00 = 37.8kHz (level A/B)
					01 = 18.9kHz (level C)
1,0		mono/stereo		00 = mono
					01 = stereo