-Original Message-
From: Maarten Bosmans [mailto:mkbosm...@gmail.com]
Sent: Wednesday, March 23, 2011 7:44 PM
To: General PulseAudio Discussion
Cc: Becker, VincentX
Subject: Re: [pulseaudio-discuss] [RFC PATCH] Log PCM samples to files
2011/3/21 Vincent Becker vincentx.bec...@intel.com:
Hi,
I recently created a new PA module (module-log-pcm) which is able to
log PCM samples from any source/sink and its corresponding
outputs/inputs. For testing audio quality, checking signal processing or
verifying the right implementation of a sound device mixed in PA,
application fields are many.
What is the use case you are specifically interested in?
It can just be any use case that is related to audio and Pulseaudio. I am
particulary interested to log audio before and after sound algorithms to check
that the signal processing has been well applied (or filters).
One just needs to give a parameter list depending on what is wished to
be logged. During the process, an audio tree, or parts of it, is probed
and logged for post-treatment purposes.
I'm sorry if I am being stuped here, but wat can the module do that
you can't with parec from a monitor source?
The module does the exact same thing as parec but parec can just log one device
at a time but not the inputs and/or outputs.
If you wanted to log the whole set of sinks/sources connected to Pulse, you
would need to run as many parec commands as there are devices. Not very
practical though.
With the module you can specify a list of sinks or sources and choose to log
the inputs or outputs, thing that is impossible now with Pulseaudio. Ok that
needs a modification in the Pulsecore
to probe the chunks when they are peeked or pushed but I don't see any other
way.
For design needs, sources and sinks are designated by ends and
source outputs/sink inputs by ports.
Why introduce the new terminology here? I think it is confusing for
people that know pulse already. Or is there perhaps some subtle
difference between the pulse concept and your designation for it?
Just to group sinks and sources under one word, same for inputs/outputs. It
does not exist in Pulseaudio, am I right? So it shouldn't confuse anybody, I
hope.
I am pretty sure that this module can be useful, especially when big sets of
sinks/sources are present and someone wants to analyze an audio tree part of
these sets during a specific use case. Why not ? May be it will create some
needs at least..
Maarten
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