[Jack-Devel] jackd and volume control

[Filipe Coelho]

This behaviour is really not nice, you are now under moderation.
So I will review your emails before they get sent to others.
Considering I am overseas on holidays, this might take a while ;)

Use the time to take a little break from this mailing list maybe,
thanks for understanding.


On 3/29/19 8:02 PM, Kjetil Matheussen wrote:
> That's a positive last post Thomas. Really sorry that I couldn't
> resist posting another one, but there's been some factual
> misinformation in this thread, and I have a feeling that it's not been
> clear that it is actually misinformation.
>
> Port gain connections does not require extra memory, extra context
> switches, or extra CPU usage (except when applying the gain itself if
> connection gain is not 1.0). That's fine, we all
> make mistakes, but unfortunately several people just repeated these
> claims afterwards. I think those who just repeated these claims should
> search within themselves and think about why they did that.
>
> For anyone reading this later who think about maybe implementing port
> gain, the only things needed to do is to extend the API, add a gain
> array into the connection manager shared memory (well, this requires
> some memory, but it's not much compared to what's already there), plus
> modify the mixing routine. The last part seems to require a little bit
> work since there's some hardware optimization you either have to try
> match up in performance, or to just do a plain float vector addition,
> at least as a first step. Smoothing the gain values to avoid clicks
> and zipper noise would be nice too, but it's not essential as a first
> step. It might be slightly more complicated than this, but I'm pretty
> sure that's the essential steps.
>
>  From the discussion here, it seems unlikely that such a modification
> would be merged, but I hope we one day would move away from installing
> libjack and friends into the system, but that these are instead
> included with a controller program (for instance qjackctl), like I do
> for Radium on Windows, i.e that all libjack functions are weak-linked
> and automatically links to the libraries specified by the the
> controller program (i.e the controller program specify the path of the
> jack libraries). Then the controller program could include a client
> mixer and a connection GUI, plus interface to start and stop the
> server. This requires current clients to be recompiled though, but not
> only is this way much simpler for the user, I think it may also be a
> way to make jack more popular on windows and osx, and even linux. This
> way, it would also be much simpler to fork jack, and include features
> such as jack port connections.
>
> I wish we could have focused more on the philosophical discussion
> about what jack is and what it should be used for (and in a slightly
> less hostile tone), but it's important to get the facts right.
>
>
>
> On Fri, Mar 29, 2019 at 5:03 PM Thomas Brand <tom at trellis.ch> wrote:
>>
>> I want to post on top and have the last word. Just because it was very
>> exciting to see all the good lords having their say on this list. It's
>> still alive!
>> Cheers
>>
>> On Fri, March 29, 2019 10:19, Orm Finnendahl wrote:
>>> Hi,
>>>
>>>
>>> thanks Fernando. To all: Please, can we just close this bikeshed for good?
>>>
>>>
>>> --
>>> Orm
>>>
>>>
>>> Am Donnerstag, den 28. März 2019 um 18:20:26 Uhr (-0700) schrieb Fernando
>>> Lopez-Lezcano:
>>>
>>>> On 3/28/19 5:18 PM, Robin Gareus wrote:
>>>>
>>>>> On 3/27/19 7:54 PM, Stéphane Letz wrote:
>>>>>
>>>>>> As an old JACK2 developer I would say: Fons is (almost always…)
>>>>>> right, listen to him ((-;
>>>>> words to live by!
>>>> Indeed. I have learned over time to pay close attention and read
>>>> carefully when some users post - Fons is one of them.
>>>>
>>>> To the proponents of gain control in the crosspoints of the jack
>>>> matrix:
>>>> please post code in the form of a patch for jack1 and jack2 that can be
>>>> reviewed. Not a big deal if this is so easy to do without side effects
>>>> or performance degradation in all platforms Jack supports.
>>>>
>>>> -- Fernando "who has not groked the source, so should shut up"
>>>>
>>>>
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>>>>
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>>>
>>>
>>
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