linuxaudio.org

Le 24 juil. 08 à 22:23, micu a écrit :
> Hello everybody,

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>

> my name is micu and I study computer science at the Dresden

> University of

> Technology. During an internship at the operating systems chair of the

> university, I ported ALSA to the chairs operating system DROPS aka

> TUD:OS

> [1,2]. To let ALSA talk to the hardware and provide to it the usual

> linux

> kernel environment DDEKit / DDELinux [3] were used. As a kernel-

> userland

> interface I wrote a very small emulation layer, which makes it

> possible to

> link SALSA-lib [4] against the ALSA "kernel" part.

>

> So right now, we have a somewhat stable ALSA server running in

> userland on top

> of DROPS without changing ALSA or the SALSA-lib source code.

>

> I have been continuing this project within my diploma thesis. The

> remit of the

> thesis can be found here [5]. It is the goal of the thesis to take

> some steps

> towards a truly realtime capable (meaning with time constraints to be

> guaranteed) FOSS audio distribution. Here [6] you can see a raw

> version of my

> requirements definition.

>

> The architecture we are going to use is --- how could it be

> different :) ---

> Jack or Jackdmp (with a strong bias towards Jackdmp). To get the

> mess out of

> my head, I wrote a short guide [7] to the Jack source code. It is a

> pretty

> raw version and it isn't finished in any way yet; but I won't work

> on it any

> longer. Nevertheless, it might be helpful to other developers new

> to Jack.

> Therefore, if you will, you may get it under any license you wish

> (attribution of the author is appreciated :) to publish and improve

> it.

>

> Of course, the long term goal of the project won't be met to any

> extent during

> my thesis and I have no idea, if this project will be continued

> here at the

> university. Neither do I know, whether I will have time to work on it

> afterwards.

>

> To make a long story short: I would like to ask my first three

> questions....

> so far :)

>

> 	1.) Do you agree on having a truly real-time capable architecture

> in the FOSS

> audio world would be a really great thing --- and would you say,

> getting such

> a thing maybe could get a (major) goal of the pro audio FOSS

> community?

It is certainly an interesting idea to better caracterize and

understand how a complex system works regarding real-time

capabilities. Some new tools are to be developed to understand what

happens when a complex graph of jack clients works for example. My

feeling it that it would be a desirable goal.
>

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> 	2.) Concerning our Jack vs. Jackdmp decision: http://

> jackaudio.org/ says,

> Jackdmp is going to be Jack 2.0. How likely and how soon do you

> think is this

> going to happen?

Difficult to say, but I stongly suggest to have a look at jack2 SVN

code ( jackdmp 1.90 version). New code and ideas are now developed on

this code base.
>

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> 	3.) I guess, there is a very minor bug in the lines 236, 237 of

> libjack/driver.c, svn revision 2734: The type castings should be

> switched.

A patch is always better.

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>

>

> Thanks a lot in advance and please excuse my bad english :(.

>

Stephane

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