Re: [linux-audio-user] batch sample editing

> John Mulholland:
>>
>> I have a large amount of aiff samples that have a predecing second or
>> two of ambient silence. To trim this out of each file is going to take a
>> very long time. Is there a program that can do this for me?
>>
>
> Probably a lot of programs...
>
> Heres a solution for SND. Its probably not the most
> elegant way, but anyway:
>
> (define (for-each-file path func)
> (let* ((dir (opendir path))
> (entry (readdir dir)))
> (while (not (eof-object? entry))
> (if (and (not (string=? "." entry))
> (not (string=? ".." entry)))
> (func entry))
> (set! entry (readdir dir)))
> (closedir dir)))
>
> (define (remove-preceding-silence infile outfile how-much)
> (open-sound infile))
> (set! (selection-position) 0)
> (set! (selection-frames) (* (srate) how-much))
> (delete-selection)
> (save-sound-as outfile))
>
> (define (delete-preceding-silence-in-dir indir outdir how-much)
> (for-each-file indir
> (lambda (name)
> (remove-preceding-silence (string-append indir "/" name)
> (string-append outdir "/" name)
> how-much))))
>
> ;;(delete-preceding-silence-in-dir "/home/kjetil/testdir"
> "/home/kjetil/testdirout" 2)
>
>
>

Oops, one ")" too much. Replace remove-preceding-silence with this one:

(define (remove-preceding-silence infile outfile how-much)
   (open-sound infile)
   (set! (selection-position) 0)
   (set! (selection-frames) (* (srate) how-much))
   (delete-selection)
   (save-sound-as outfile))
Received on Sat Aug 6 20:15:07 2005