Linux-audio-user January 2007

linux-audio-user@lists.linuxaudio.org

187 participants
180 discussions

by David Baron

>Right now, none work. I am using realtime-lsm and am in the 29-audio group. >Should not need to but must one do something about that SUID bit that gets >set in most music program setups? Running sudo WILL init /dev/dsp with no jack. Did not hear anything from the sample project, however. With jack, sudo will not show the alsa-pcm and no jack clients show up.

17 years, 11 months

[linux-audio-user] Re: hardware mixing - what it _actually_ is?

by unknown＠example.com

> > > "Hardware mixing" in ALSA terminology refers to the mixing of multiple > > > sound sources from the PC by the hardware. For example, mplayer > > > output and system notification sounds. > > > > Yeah. I suspect (and Mark apparently did, too) that the original > > poster meant to ask about hardware monitoring, which is completely > > different :-) > > > > Explanation here: > > http://ardour.org/manual/recording/monitoring well, i asked about hardware _mixing_, since it is pretty obscure thing, unlike hardware _monitoring_ :) > Is there a commonly understood meaning? I guess I'm uncommonly (or > commonly for me) in the dark about that. that's troo :) > > I stand corrected. Mark was right - these devices do have hardware > > mixing, they just implement it in an odd way, probably to keep the > > interface similar to other OS. > > its not true to say that with ALSA, they support what is commonly > understood as h/w mixing. you cannot do independent open's of several > subdevices and get the output of each subdevice mixed down to the > outputs. > > yes, they do have a very powerful h/w matrix mixer, but it is not > accessible via a series of independent subdevices. it also is not > supported by the ALSA mixer API at this time. > > > you cannot do independent open's of several > > > subdevices and get the output of each subdevice mixed down to the > > > outputs. > > > > This seems a Linux Software Developer centric statement. What does it mean? > > it means that you can have up to N apps all using the same card without > any s/w mixing going on. each one calls snd_pcm_open() which internally > calls snd_pcm_open_subdevice() and assuming the subdevices are not all > busy, it will work. a subdevice is a "stream" that always sends its > signal to the outputs associated with the PCM device, but can be opened > and closed independently. ok. this clarifies things enough. so, if i use only one app (csound), seems like there's no need to care about this hardware mixing thing. thanx again. -- sex, pot, open source!!

17 years, 11 months

[linux-audio-user] Re: netjack & jackdmp ? (Geoff Beasley)

by Stéphane Letz

> > > ------------------------------ > > Message: 7 > Date: Wed, 24 Jan 2007 08:05:16 +1100 > From: Geoff Beasley <songshop(a)bizmedia.com.au> > Subject: [linux-audio-user] netjack & jackdmp ? > To: torbenh(a)gmx.de > Cc: linux-audio-user(a)music.columbia.edu > Message-ID: <200701240805.16674.songshop(a)bizmedia.com.au> > Content-Type: text/plain; charset="us-ascii" > > it seems netjack won't build against jackdmp. It won't for me > anyway. Does > anyone have netjack working with jackdmp ? I get an error when i > try to > build; something about jack_micoseconds_something.. sorry, i didn't > write it > down at the time :( > > best, > > g. > netjack won't built directly. The backend implementation in a bit different in (C++) jackdmp thus the initial C netjack backend would have to be adapted. Moreover netjack need to access some internal part of the transport stuff that is not yet "cleanly" exposed (neither in jackd or jackdmp) But contributions are always welcomed ((-: Stephane

17 years, 11 months

[linux-audio-user] Linux software feature matrix

by Lars Luthman

Please fill in empty cells and add programs that you know about: http://lau.linuxaudio.org/faq/index.php/FeatureMatrix --ll

17 years, 11 months

[linux-audio-user] This criticism of jackd valid?

by Chris Metzler

As much more of a music maker than a developer, I'm not able to evaluate whether this post from a current thread on Slashdot is a valid criticism of JACK: http://ask.slashdot.org/comments.pl?sid=217898&cid=17700570 I'm curious what people here think? -c -- Chris Metzler cmetzler(a)speakeasy.snip-me.net (remove "snip-me." to email) "As a child I understood how to give; I have forgotten this grace since I have become civilized." - Chief Luther Standing Bear

17 years, 11 months

[linux-audio-user] interview with Rui Nuno Capela

by Dave Phillips

Greetings: I've placed online an interview with Rui Capela, the creator of QJackCtl, QSynth, QSampler, and QTractor. You can read it here: http://www.linuxjournal.com Enjoy! Best, dp

17 years, 11 months

[linux-audio-user] netjack & jackdmp ?

by Geoff Beasley

it seems netjack won't build against jackdmp. It won't for me anyway. Does anyone have netjack working with jackdmp ? I get an error when i try to build; something about jack_micoseconds_something.. sorry, i didn't write it down at the time :( best, g.

17 years, 11 months

[linux-audio-user] hardware mixing - what it _actually_ is?

by unknown＠example.com

hi community. i am choosing a sound card for my new box, an i found myself totally obscured about such thing as hardware mixing. so, please help me to clarify: (0) what it _actually_ does? and (1) in particular, (how) can it help in live performance? some details: i'm choosind between echo (mia midi or gina 3g) and m-audio (delta series) cards. the only thing used for live performance is csound driven by hardware midi controllers. thanx in advance. p.s. yes, i did pretty much googling etc before writing here. -- sex, pot, open source!!

17 years, 11 months

[linux-audio-user] Re: hardware mixing

by ram

I can confirm the RME HDSP 9632 cards and add-ons also support hardware mixing. They work really well too I may add.

17 years, 11 months

Re: [linux-audio-user] Aldrin 0.9

by David Baron

On Tuesday 23 January 2007 15:04, linux-audio-user-request(a)music.columbia.edu wrote: > > Finally got Aldrin up and working (sort of). Also finally "got it" (only > > took from version 0.5). Lunar! > > 0.5? Maybe 0.6:-) > > > The program cannot init any audio device, with or without jack running > > (only difference is an alsa-pcm item on the wave out prefs menu). > > make sure that no other sound daemon like esd or artsd is running. right > now there is no dmix-support. please also let me know about any > suspicious output from the program. The only telling output is about bad samplerate 44100, (same as in jackd, only one on the card, I'm afraid) or device busy (nothing else to my knowledge running) The latency was also identical to that in jack setup and jack will start, so .... BTW: All choices but alsa-pcm for jackd running WILL be busy (jack will take them). Most programs init a jack client which may be manually or automatically connected to the available alsa-pcm. The audio devices dropdown not really relevant for jack. For non-jack, hw:0 should be available/ /dev/dsp should also work using alsa-oss emulation. Right now, none work. I am using realtime-lsm and am in the 29-audio group. Should not need to but must one do something about that SUID bit that gets set in most music program setups?

17 years, 11 months

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Linux-audio-user January 2007