[Jack-Devel] Looking for visual "Clipping indicator" (linux command line interface)

[Kjetil Matheussen]

On Fri, Nov 2, 2018 at 12:21 PM Kjetil Matheussen
<k.s.matheussen at gmail.com> wrote:
>
> On Fri, Nov 2, 2018 at 11:16 AM Jaime T <enopatch at gmail.com> wrote:
> >
> > Hi all.
> >
> > Is there software that someone could recommend that would provide a
> > visual indicator of clipping occuring in a jack stream? Extra points
> > if the visual indicator remains set until manually reset. Double extra
> > points if the program can run inside a (linux) command-line
> > environment?
>
> You can use jack_capture and record to /dev/null
> The red color shown when clipping is reset after around 2 seconds though,
> but you can probably fix this quite easily in the source code.

Apply this patch:

diff --git a/jack_capture.c b/jack_capture.c
index 3f77c56..f62e883 100644
--- a/jack_capture.c
+++ b/jack_capture.c
@@ -647,9 +647,11 @@ static void print_console(bool
move_cursor_to_top_doit,bool force_update){
        vu_peaks[ch]    = pos;
        vu_peakvals[ch] = val;
        vu_times[ch]    = 0;
+        /*
      } else if (vu_times[ch]++ > 40) {
        vu_peaks[ch]    = pos;
        vu_peakvals[ch] = val;
+        */
      }

and run this line:

while true ; do jack_capture /dev/null ; done

then you can reset peaks by pressing return.