Linux-audio-dev

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7534 discussions

[linux-audio-dev] DJCJ Linux Audio Developers Tech Support database.

by Patrick Shirkey

I'm pleased to anounce that a database for people willing to provide Tech Suppport to their local community has been setup. The service is free of charge and hosted at http://www.djcj.org/ The purpose of this database is to promote the professional arm of the Linux Audio Developers community. It is intended to be of use to potential clients who may be interested in getting a Linux Audio system working but don't have the time or background knowledge to do the installation or system maintainance? The people and businesses presented in the database are not endorsed or guaranteed by DJCJ.org but they are active members of the Linux Audio Community. Payment for services received is encouraged. Rates are decided by the parties involved. This is intended to be a database for professional tech support. Please let people know about it so that we can show the world we are more than just a bunch of amateurs hacking in our spare time. The database currently provides a very simple interface for adding your contact details and there is also a contact form provided for potential clients to easily get hold of you. Special thanks to Steve Harris and Antti Boman for assistance with the internal code. It is guaranteed that the interface will become much more user configurable over time. Any feedback is welcome and appreciated. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

23 years, 3 months

Re: Re: [linux-audio-dev] Fwd: Opinions on running VST or DirectX plugins

by chrismorgan＠rcn.com

Just so people don't think the code has fallen off of the face of the planet ;-) Currently I'm working on two things with the wine jack driver , one of which needs to be complete before I submit the patch, the other can wait until some ongoing jack support is complete. 1. The driver currently closes and opens jack connections synchronously with wodOpen and wodClose. The problem is that jack doesn't actually close the clients right away, sometimes it can take many seconds for this to occur. Apparently this is a known jack bug but I'm also wondering if this is a problem in wines pthread implementation of conditions(there is no support for them right now). Either way I've implemented a workaround that basically consists of opening jack connections and marking them as in-use or available as apps open or close audio devices. This behavior can be enabled/disabled via a define in the driver. This isn't complete yet but it should be soon and would prevent the lockups and delays that currently make things a pain. 2. I don't know of an easy way to do resampling so the input audio matches the sample rate that jack expects. What I want is to be able to do something along the lines of: set_sample_rates(input_rate, jack_output_rate); set_resample_algorithm(x); /* pick a reasonable algorithm based on the current cpu and latency requirements */ And then in the callback routine something like: resample(audio_data_in, *audio_data_out); I haven't found anything even close to this simple as of yet, if anyone has any suggestions feel free to mail me about them. There is someone on the jack mailing list working on a resampling library that is supposed to be easy to use and flexable. Either way, this isn't critical although your music sounds funny if your sample rates don't line up very well ;-) Otherwise I'm also looking into a crash with using the jack driver and directsound that might be due to the client process and memory allocation. After working on the arts driver I realized that the future of audio servers really is callback based. It is quite frustrating to see so little use of jack and so much use of poor solutions like direct hardware drivers(alsa/oss) or high latency servers like artsd. No offense intended to people that work on or use either of those audio solutions, it just doesn't make sense when you want to have multiple apps outputting audio at the same time or if you need low latency(high end audio, games?, etc). I'll see what I can do to get things cleaned up and a patch submitted in the next week, conditional of course upon Alexandre accepting jack support into wine. At least now I have someone other than myself with an interest in using jack and wine together ;-) Thanks, Chris > > From: "Kjetil S. Matheussen" <k.s.matheussen(a)notam02.no> > Date: 2002/10/23 Wed PM 12:18:13 EDT > To: linux-audio-dev(a)music.columbia.edu > CC: wine-devel(a)winehq.com > Subject: Re: [linux-audio-dev] Fwd: Opinions on running VST or DirectX plugins > on Linux in real time > > > > On Wed, 23 Oct 2002, Taybin Rutkin wrote: > > > On Wed, 23 Oct 2002, Kjetil S. Matheussen wrote: > > > > > Could it be possible to overcome all problems mentioned just by simply > > > adding jack-support to the wine-server? Then someone could make a simple > > > windows-program for chaining directx and vst plug-ins. > > > > Someone has done this, I believe: > > http://kt.zork.net/wine/wn20021011_139.html#2 > > > Wow, it allready exist. Hey, wine-people, this driver is really needed for > real-time audio-work, and for programs as sound-editors, multitrackers > and interactive dsp programs as pd, jmax, and a lot of others. Artsd > (f.ex) is not an alternative in its current form, and probably never will > be either. Its something else. I guess Paul or some other competant person > can explain a bit more why jack is so important. > > > -- > > > > >

23 years, 3 months

RE: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] hel p for a levelmeter]

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Patrick Shirkey [mailto:pshirkey@boosthardware.com] > Sent: Wednesday, October 23, 2002 11:38 AM > > >> Plus the sound matrix at > >> http://www.alsa-project.org/alsa-doc/ doesn't say there > are problems > >>getting docs from manufacturer. > > >Perhaps someone should add a note. > > I thin there is right at the bottom of the page. But I will > make a more > noticible note. this is what's on the page: Creative Labs | Soundblaster Live Platinum | EMU10K1 | Install | (4)[A][B] bottom of the page: (4) Hardware mixing supported ... NOTE: Just because an I/O is listed does NOT mean it is guaranteed to be supported. Please check the mailing list archives before making purchase decisions based on requirements for IEC958 or ADAT I/O. [A] IEC958 RCA Input [B] IEC958 RCA Output which does not have a lot of informational value (I know what it does not mean but what does it mean?) and it definitely does not imply there is a problem of getting the docs to support certain functionality. > > professional system or not, I would expect it to be > capable running > >browser and mp3 player at the same time (even though I would not > expect >this capability to be used in studio work). > > AFAIK this is possible if you use kde or gnome as your > desktop and don't > mind having artsd block the interface. Many other desktops > support artsd ? it's not desktops but applications that need to support sound server. you mean that the sound server is not installed as part of that dektop environment? > also but they are usually not installed by default. Hence > anyone who can > install an alternative desktop should also be willing to > get the sound > server running if they desire that functionality. This has > been the case > for at least the past three years. yes, sound servers can be used with certain application, but what is needed is something that supports ALL applications (or more precisely, that is supported by all applications), or at least does not prevent other applications from working (jack might turn out to be the solution - once it's as good as planned it might become the only player in town) erik

23 years, 3 months

Re: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] hel p for a levelmeter]

by Patrick Shirkey

>> Plus the sound matrix at >> http://www.alsa-project.org/alsa-doc/ doesn't say there are problems >>getting docs from manufacturer. >Perhaps someone should add a note. I thin there is right at the bottom of the page. But I will make a more noticible note. > professional system or not, I would expect it to be capable running >browser and mp3 player at the same time (even though I would not expect >this capability to be used in studio work). AFAIK this is possible if you use kde or gnome as your desktop and don't mind having artsd block the interface. Many other desktops support artsd also but they are usually not installed by default. Hence anyone who can install an alternative desktop should also be willing to get the sound server running if they desire that functionality. This has been the case for at least the past three years. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

23 years, 3 months

RE: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] hel p for a levelmeter]

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Taybin Rutkin [mailto:trutkin@physics.clarku.edu] > > On Tue, 22 Oct 2002, STEFFL, ERIK (SBCSI) wrote: > > > except of the blocking of sounds (the problem mentioned > above) I am quite > > dissapointed by functionality of linux drivers I have > tried, I have sb live > > platinum and (last time I checked): > > Maybe you should buy cards from companies that care about > Linux support. and which are those? I know of no way to get information about how good/complete the alsa driver is. I have read number of thread on various mailing lists/forums etc. about which cards to use (for different purposes) and I didn't find any useful information... The docs at alsa site are pretty much useless for this purpose (as far as I can tell). BTW creative provides some linux support. Plus the sound matrix at http://www.alsa-project.org/alsa-doc/ doesn't say there are problems getting docs from manufacturer. > You seem to be forgetting that most of the drivers are written by > volunteers working without documentation. no I don't. I am not saying somebody should go and fix my problems. I was just ranting because I am frustrated and I hope it will provide semi-useful feedback to somebody... (and somebody will go and fix my problems:-) possibly... and we were talking about acceptance of linux audio. erik

23 years, 3 months

RE: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] hel p for a levelmeter]

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Patrick Shirkey [mailto:pshirkey@boosthardware.com] > Eric wrote: > >it is also pretty much useless for general users. I mean if I can't > >listen to mp3 and browse the web at the same time ... > (without sound > >servers which were discussed recently and as far as I can tell the > >general consensus is that they are bad and not to be used). > > This is a misconception on your part. The general consensus no it is not. > is that the > artsd, esd, gstreamer... servers are *very* useful just not for > professional audio needs. the sound system has to work. using a specific sound server limits you to using programs that work with given sound server. that's what I call useless (as a general solution, some might find it useful). and btw last time I tried (iirc esd) the sound wuality was poor compared to sound going straight to sound card (pentium 1GHz, sb awe). also - why should there be any difference between professional and non-professional software? should peopole who are not in studio not be able to record? should the mp3 player be worse when you are not being for listening to it? or? obviously the style of work of professional is different but that doesn't mean that the programs for non-professional use should be of lesser quality. in other words: everything (talking about infrastructure, not each individual application) should be suitable for professional use (the point: if the sound server is not for professional work than it's not for amateur work either). > I am pretty sure that people who only need to browse and hear why "only". think of s/only/also/ professional system or not, I would expect it to be capable running browser and mp3 player at the same time (even though I would not expect this capability to be used in studio work). erik

23 years, 3 months

RE: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] hel p for a levelmeter]

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Peter L Jones [mailto:peter@drealm.org.uk] > On Tuesday 22 Oct 2002 20:27, Patrick Shirkey wrote: > > Peter wrote: > > >All these things just make life _easier_. I want to get on with > > >developing code, not wondering why my hardware isn't performing. I > > >don't _want_ to have to learn _that_ part of the system. > Because I'll > > >only need to do it once: > > >when I spec the next machine. (The next time I spec a machine, > > >everything I found out last time will be out of date.) > > > > This is a good idea to have this support and you've picked the right > > thread for asking for it. Currently there are only a > handful of people > > who have worked on the official ALSA docs. I have done 90% > of the work > > myself. It's great I'm learning heaps in the process and > will definitely > > think about how to make it possible to add the info you require. > > > > Unfortunately we don't often get success stories on the > ALSA lists so we > > don't really know how well things work until someone says that it's > > broken :( > > Heh. the life of a software developer. You only get fault > reports and feature > requests (that need to be delivered yesterday) :-). actually I think it would be of great value to document the failures - from alsa web site (and even reading alsa-user mailing list) you might be under impression that sound blaster live platinum works fairly well, the truth is that it doesn't work really well (for what I want to use it for - external midi doesn't really work, rca connectors are dead (last time I checked)). erik

23 years, 3 months

RE: [linux-audio-dev] Re: image problem

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Anthony [mailto:avan@uwm.edu] > Sent: Tuesday, October 22, 2002 7:47 PM > To: linux-audio-dev(a)music.columbia.edu > Subject: Re: [linux-audio-dev] Re: image problem > > > * Ivica Bukvic <ico(a)fuse.net> [Oct 22 02 20:16]: > > > I am thankful for Jack, but at the same time that does not > mean there > > should be no criticism. If you are referring to me > criticizing Paul's > > statements, then how do we dare criticize Linus Torvalds > for letting OSS > > happen? After all, he is the one who made Linux, without > him Linux would > > have never been. And since we use it, should we simply shut > up and use > > it with OSS? ;-) > > Theres quite some difference between constructive criticism and saying > that something is broken or incomplete because it doesn't meet > your needs, despite being told over and over that your needs > were never > the objective of the system in the first place or there is no > manpower devoted to achieving what you want right now. as I understood it he wasn't really criticising JACK for being what it is, he was pointing out that basic audio doesn't work well (in linux) and that unless that's fixed the linux would not be accepted as (part of) audio solution. Which might or might not be true - e.g. (AFAIK) for studios you just need small set of apps and don't care about whether general-user apps play nice. erik

23 years, 3 months

Re: [linux-audio-dev] Re: image problem [was Re: [Alsa-devel] help for a levelmeter]

by Patrick Shirkey

Peter wrote: >On Tuesday 22 Oct 2002 17:42, Paul Winkler wrote: >> On Tue, Oct 22, 2002 at 11:14:52AM +0100, Steve Harris wrote: >> > I can't answer this properly, but there is some issue to with mmap >mode I >> > believe. It is a very small number of cards that dont work. >> >>> We should compile a list of them, and maybe put it in the JACK FAQ. >> >> --PW >I'd much rather have a list of current cards that work _well_ than a >lists of cards that don't. > >The current ALSA card list just says whether or not a card has a driver >(and the state of that driver). It doesn't indicate how well the card >is going to work. > >I don't want to have to learn about DSPs and stuff to be able to >identify a _good_ sound card. I've currently got a shortlist for my >next machine: > * MidiMan Delta Audiophile 2496 (Envy24) > * VideoLogic SonicFury OEM (CS4360) > * Creative SB PCI 128 (ES1371) > >I've read the specs and looked around various review sites. Nothing >anywhere tells me how well they're going to work. Or does it? Am I >failing to find some secret source of information? > >All these things just make life _easier_. I want to get on with >developing code, not wondering why my hardware isn't performing. I >don't _want_ to have to learn _that_ part of the system. Because I'll >only need to do it once: >when I spec the next machine. (The next time I spec a machine, >everything I found out last time will be out of date.) This is a good idea to have this support and you've picked the right thread for asking for it. Currently there are only a handful of people who have worked on the official ALSA docs. I have done 90% of the work myself. It's great I'm learning heaps in the process and will definitely think about how to make it possible to add the info you require. Unfortunately we don't often get success stories on the ALSA lists so we don't really know how well things work until someone says that it's broken :( As it is I have tried to provide a feedback inteface via the notes additions in the docs. So far it is being used but not as much as it could be. I guess it will just take time. You can lead a horse to water... Do you have a specific idea envisioned for how we could present the info more effectively or a way to make more people contribute their results? I'm listening. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

23 years, 3 months

Re: [linux-audio-dev] [ann] unmatched - a LADSPA amp tone

by Stefan Nitschke

>From: Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> >On Tue, Oct 22, 2002 at 09:38:26 +0200, Tim Goetze wrote: > > the problem with converging IIR is that either the IIR or the > > converging algorithm or both don't like impulses that are too > > lively. the converger will simply fall dead when it sees an > > exponentially decaying white noise impulse. it makes sense, > >I don't understand why. Is it just beacuse the kernle is a bit too long to >be stable, or is there someting more to it than that? > When the converger tries to find the best coefficients by using a recursive error minimation i dont wonder that i may fail here. A IIR is nothing else as a differential equation solver. As a result you can only approximate kind of periodic signals i guess. Correct me if i am wrong, its quite a long time ago since i learned about linear system theorie and IIR stuff... - Stefan _________________________________________________________________ Surf the Web without missing calls! Get MSN Broadband. http://resourcecenter.msn.com/access/plans/freeactivation.asp

23 years, 3 months

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Linux-audio-dev