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Full Discussion: Experimental awk audio converter for CygWin and AudioScope.sh
Top Forums Shell Programming and Scripting Experimental awk audio converter for CygWin and AudioScope.sh Post 302923352 by wisecracker on Sunday 2nd of November 2014 01:02:54 PM
Old 11-02-2014
Hi Corona688...

Along with a few others, you have been extremely helpful with AudioScope.sh over its 21 month lifetime.

All I can say is many thanks.

I will try this baby of yours out and see how it goes on CygWin, as that is the platform that it is aimed at...

Bazza.

---------- Post updated 02-11-14 at 01:44 PM ---------- Previous update was 01-11-14 at 06:59 PM ----------

Hi Corona688...
Just this minute tried your code.
Had to add a '(' in red below to get it to run but ot only delivers 1 byte instead of 48000.
Code:
#!/bin/bash
# 16to8bit_new.sh
> /tmp/sample.raw
> /tmp/leftbinary
> /tmp/signed16bit.txt
dd if=/dev/urandom of=/tmp/sample.raw bs=1 count=192000 > /dev/null 2>&1
od -td2 -An /tmp/sample.raw > /tmp/signed16bit.txt
awk --characters-as-bytes 'NR%2 { printf("%c", (($1+32768)/256)) > OUT }' RS="[ \r\n\t]+" BINMODE=3 OUT="/tmp/leftbinary" /tmp/signed16bit.txt

Results:-
Code:
Last login: Sun Nov  2 13:30:37 on console
AMIGA:barrywalker~> cd Desktop
AMIGA:barrywalker~/Desktop> cd Code
AMIGA:barrywalker~/Desktop/Code> cd Awk
AMIGA:barrywalker~/Desktop/Code/Awk> ./16to8bit_new_c688.sh
awk: extra ) at source line 1
 context is
	NR%2 { printf("%c", >>>  ($1+32768)/256)) <<< 
awk: syntax error at source line 1
awk: illegal statement at source line 1
	extra )
AMIGA:barrywalker~/Desktop/Code/Awk> ./16to8bit_new_c688.sh
AMIGA:barrywalker~/Desktop/Code/Awk> ls -l /tmp/leftbinary
-rw-r--r--  1 barrywalker  wheel  1  2 Nov 13:39 /tmp/leftbinary
AMIGA:barrywalker~/Desktop/Code/Awk> _

---------- Post updated at 06:02 PM ---------- Previous update was at 01:44 PM ----------

This is an even smaller version for the LHS only and works a real treat in CygWin...
Thanks C688 for mentioning the removal BEGIN ...
Code:
#!/bin/bash
# 16to8bit_new.sh
> /tmp/sample.raw
> /tmp/leftbinary
> /tmp/signed16bit.txt
dd if=/dev/urandom of=/tmp/sample.raw bs=1 count=192000 > /dev/null 2>&1
od -td2 -An /tmp/sample.raw > /tmp/signed16bit.txt
awk --characters-as-bytes '
{
	BINMODE=3;
	FS=" ";
}
{
	if ($1=="") exit(0);
	$1=(int(($1+32768)/256));
	$3=(int(($3+32768)/256));
	$5=(int(($5+32768)/256));
	$7=(int(($7+32768)/256));
	printf("%c%c%c%c",$1,$3,$5,$7) > "/tmp/leftbinary";
}' < /tmp/signed16bit.txt

Listening tests were more than good, now I have to attempt to obtain a conversion to 8000Hz sampling rate for the frequency counter part of AudioScope.sh...

I have a simple idea to test and will post here when done.
 

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LEARN ABOUT OPENSOLARIS

granlib

RANLIB(1)						       GNU Development Tools							 RANLIB(1)

NAME

       ranlib - generate index to archive.

SYNOPSIS

       ranlib [-vV] archive

DESCRIPTION

       ranlib  generates  an index to the contents of an archive and stores it in the archive.	The index lists each symbol defined by a member of
       an archive that is a relocatable object file.

       You may use nm -s or nm --print-armap to list this index.

       An archive with such an index speeds up linking to the library and allows routines in the library to call  each	other  without	regard	to
       their placement in the archive.

       The GNU ranlib program is another form of GNU ar; running ranlib is completely equivalent to executing ar -s.

OPTIONS

       -v
       -V
       --version
	   Show the version number of ranlib.

SEE ALSO

       ar(1), nm(1), and the Info entries for binutils.

COPYRIGHT

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ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWbinutils    |
       +--------------------+-----------------+
       |Interface Stability | External	      |
       +--------------------+-----------------+
NOTES

       Source for GNU binutils is available on http://opensolaris.org.

binutils-2.14.91						    2004-04-09								 RANLIB(1)
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