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Re: read 12 bit array [message #75585 is a reply to message #75569]

Thu, 31 March 2011 08:00

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

On 31 mar, 15:52, Wox <s...@nomail.com> wrote:
> Hi all,
>
> Does anyone have an idea how to read a 12bit array from a file (not
> ASCII, just a binary dump).
>
> Thanks,
>
> Wout

Read it as [3,N] byte array b, if the file contains an array of 2*N 12
bits words.
Then transform the result to an integer (16 bits) array by b = fix(b,
0, 3, N)
Finally concatenate the first and last bytes of each triple with
corresponding half parts of the middle byte, that is :
[ b[0,*] or (ishft(b[1,*] and '0F'x,8), ishft(b[2,*],4) or
ishft((b[1,*] and 'F0'x), -4) ]
You should get your 12 bits array packed in a 16-bits array of same
size.
alx.

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[Message index]

		Re: read 12 bit array By: Wout De Nolf on Sat, 02 April 2011 11:55
		Re: read 12 bit array By: Wout De Nolf on Fri, 01 April 2011 03:41
		Re: read 12 bit array By: lecacheux.alain on Thu, 31 March 2011 08:00
		Re: read 12 bit array By: pgrigis on Thu, 31 March 2011 07:54
		Re: read 12 bit array By: David Fanning on Thu, 31 March 2011 07:18

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