1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
(define segment
(lambda (marks-not-files)
;; run through currently selected file looking for sound segments
;; and write each to a separate (aiff) file named segN.snd, or
;; mark the segment boundaries if marks-not-files
(let* ((snd (selected-sound))
(soundname (file-name snd))
(chans (sound-chans soundname))
(frames (snd-length snd))
(output-counter 0)
(hop-size 32)
(silent-max (* hop-size .001))
(seg-start -1))
(do ((frame 0 (+ frame hop-size)) )
((>= frame frames))
;; check each channel
(let ((chan-max 0.0))
(do ((chan 0 (1+ chan)))
((= chan chans))
(let ((data (samples frame (+ frame hop-size) snd chan))
(sum 0.0))
(do ((i 0 (1+ i)))
((= i hop-size))
(set! sum (+ sum (abs (vector-ref data i)))))
(if (> sum chan-max) (set! chan-max sum))))
(if (> chan-max silent-max)
(if (< seg-start 0)
(set! seg-start frame))
(if (and (>= seg-start 0) (> frame seg-start))
(begin
(set! output-counter (1+ output-counter))
(if marks-not-files
(begin
(report-in-minibuffer (string-append "segment "
(number->string output-counter)
": "
(number->string seg-start)
" "
(number->string frame)))
(add-mark seg-start snd 0)
(add-mark frame snd 0))
(begin
(let* ((old-sync (syncing? snd)))
(set-syncing #t snd)
(make-region seg-start frame snd)
(save-region 0 (string-append "seg" (number->string output-counter) ".snd"))
(set-syncing old-sync snd))))
(set! seg-start -1))))))
"done")))
|
