Date: Fri, 24 Apr 2020 00:53:28 -0600 From: "@lbutlr" <kremels@kreme.com> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Audio recording on demand (level + duration) Message-ID: <AD40E5FB-7324-4740-9D51-72E56B33EDB0@kreme.com> In-Reply-To: <20200423175126.e9eea9fb.freebsd@edvax.de> References: <20200423175126.e9eea9fb.freebsd@edvax.de>
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On 23 Apr 2020, at 09:51, Polytropon <freebsd@edvax.de> wrote:
> continuously monitor audio input
> if volume > 0:
> create UTC timestamp (YYYY-MM-DD_HH:MM:SS)
> start recording (in background)
> if volume still =3D 0 again
> send TERM signal do recorder
> recorder closes file (valid file!)
> if duration of file > 10 seconds:
> convert file to MP3 (in background)
> rename file using timestamp
> else:
> remove file
My guess is that you need to do something like this:
cat /dev/dsp > tmpfile
Periodically copy and scan tmpfile for portions that have sound =
levels above x%
Clip those parts into new file
Repeat scan until reaching ends fo file
When entire file is scanned, delete copy and cat > /dev/null tmpfile
The exact methods probably depend on the output of cat /dev/sndstat
> I'd like to create the "wrapper" as a simple shell script.
>=20
> So when this system runs for a while, I will have certain
> files, let's say
>=20
> 2020-04-23_17:00:01.mp3
> 2020-04-23_17:35:28.mp3
> 2020-04-23_21:19:57.mp3
> ... and so on ...
If you process the file once per day, this is trivial, simply get the =
start of the sound duration from the copy and add this to the dat =
eyesteray. Even if you want to process the sound more frequently, it is =
not difficult, just more tedious.
> An option would be to add the duration
> to the filename (2020-04-23_21:19:57_00:24:13.mp3 - a file
> that contains 24 min 13 sec audio).
Very easy to get the duration of your sound file from, for example, =
ffmpeg.
Keep in mind, I=E2=80=99m guessing here, but hopefully this will help at =
least look at another direction and maybe figure out or find the answer =
you need.
--=20
I intend to live forever. So far, so good.
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