Subject: Re: [ecasound] ecatools addition - ecasignalview
From: Jeremy Hall (jhall@uu.net)
Date: Sat Dec 02 2000 - 04:49:50 EET
one more time, it has been a while, please could you explain the pos/neg
thingie? WHat does it mean?
also, while on the subject, I have noticed that when capturing,, it says
0.99997 instead of >=1 I dunno when this happened, but was some time
ago. Is alsa compressing my input for me? :(
_J
In the new year, Kai Vehmanen wrote:
> This is one of those little things that should have been added a long,
> long time ago. I rewrote -ev's visual look, and made this little util,
> ecasignalview, which periodically shows its output. Ncurses is used for
> clearing the screen between updates. Here's a "screenshot":
>
> --cut--
> (audiofx) -- Amplitude statistics -----------------------------
> Range, pos/neg, count,(%), ch1...n
> Pos -1.0 dB: 0 0
> Pos -2.0 dB: 0 0
> Pos -4.0 dB: 0 0
> Pos -8.0 dB: 0 0
> Pos -16.0 dB: 0 0
> Pos -32.0 dB: 1475 1375
> Pos -64.0 dB: 2982 3088
> Pos -inf.0 dB: 152 151
> Neg -inf.0 dB: 132 144
> Neg -64.0 dB: 3096 3172
> Neg -32.0 dB: 1379 1286
> Neg -16.0 dB: 0 0
> Neg -8.0 dB: 0 0
> Neg -4.0 dB: 0 0
> Neg -2.0 dB: 0 0
> Neg -1.0 dB: 0 0
> (audiofx) Peak amplitude, period: pos=0.10629 neg=0.11493.
> (audiofx) Peak amplitude, all : pos=0.99997 neg=1.00000.
> (audiofx) Clipped samples, period: pos=0 neg=0.
> (audiofx) Clipped samples, all : pos=0 neg=2.
> (audiofx) Max gain without clipping, all: 1.00003.
> (audiofx) -- End of statistics (periodical counters reseted) --
> --cut--
>
> >From ecatools man page:
>
> --cut--
> SYNOPSIS
>
> ecasignalview [ options ] [ input ] [ output ]
>
> DESCRIPTION
>
> Ecasignalview is meant for monitoring signal amplitude and
> peak statistics. It accepts the following options:
>
> input The first option not starting with with a '-' is
> interpreted as input string. This can be a device
> or a filename. All formats supported by libecasound
> are accepted. Defaults to '/dev/dsp'.
>
> output Similarly to input, second option not starting with
> a '-' is interpreted as output. Defaults to 'null'.
>
> -b:buffersize
> Buffersize in sample frames. Defaults to 128.
>
> -c Enable cumulative mode. Counters are not reseted
> after refresh.
>
> -d Enable debug mode.
>
> -r:rate_msec
> Specify screen refresh rate in milliseconds.
> --cut--
>
> ... and it's in CVS ...(switching console) ... now. :)
>
> --
> . http://www.eca.cx ... [ audio software for linux ] /\ .
> . http://www.eca.cx/aivastus ... [ aivastus net radio ] /\ .
> . http://www.eca.cx/sculpscape [ my armchair-tunes mp3/ra/wav ]
>
>
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>
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