----------========= FILE STRUCTURE AUDIO MPEG FILE ===========-----------
               CORRECTED BY FLAX / FUTURE CORPORATION
----------====================================================-----------
file

	a file has one or more 'frames'.

	a frame has a 'frame header' and 'frame data'
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frame length

	the frame length depends on the format and can vary per frame.
	the frame ends before the next sync header (see frame header).
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frame header

	the frame header of an audio mpeg file consist of 4 bytes, which
	are at the beginning of a frame. They don't have to be the same
	for every frame. (p.e. the bit 'padding' can change per frame)

	byte       0        1        2        3
	binary 11111111 111xabbc ddddeefg hhjjkmpp

		1 - sync header
		x - mpeg 2 type
		a - version
		b - layer
		c - error protection
		d - bit rate index
		e - sample rate index
		f - padding
		g - extension
		h - channel mode
		j - mode extension
		k - copyright
		m - original
		p - emphasis
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1 - sync header

	must be 11111111 111xxxxx
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x - mpeg 2 type

	0 = mpg-2.5
	1 = mpg-1 or mpg-2
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a - version

	0 = mpg-2 (x = 1) or 2.5 (x = 0)
	1 = mpg-1
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b - layer

	0 = layer-1
	3 = layer-2
	2 = layer-3
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c - error protection

	0 = on
	1 = off
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d - bit rate

	       mpg-1	     	mpg-2       	mpg-2.5
	(hex)  32,44.1,48 kHz   16,22,24 kHz	8,11,12 kHz
	$0          0              0              0
	$1         32              8              8
	$2         40             16             16
	$3         48             24             24
	$4         56             32             32
	$5         64             40             40
	$6         80             48             48
	$7         96             56             56
	$8        112             64             64
	$9        128             80             80
	$a        160             96             96
	$b        192            112            112
	$c        224            128            128
	$d        256		 144            144
	$e        320		 160            160
	
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e - sample rate

	      mpg-1     mpg-2     mpg-2.5
	0 = 44.1 kHz    22 kHz    11 kHz
	1 =   48 kHz    24 kHz    12 kHz
	2 =   32 kHz    16 kHz    08 Khz
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f - padding

	1 = unused bits are filled (padding required)
	0 = all bits in frame are used
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g - extension 

	0 = none
	1 = private
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h - channel mode

	0 = stereo
	1 = joint stereo
	2 = dual channel
	3 = mono
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j = mode extension

	when encoding with joint stereo, this specifies to which freq.band
	it is bound.

            layer-1&2  layer-3
	0 =     4         0
	1 =     8         4
        2 =    12         8
        3 =    16        16
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k - copyright

	0 = no
	1 = yes
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m - original

	0 = no
	1 = yes
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p - emphasis

	0 = none
	1 = 50/15 microseconds
	3 = CITT j.17
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