Linux-audio-dev

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3 participants
7541 discussions

[linux-audio-dev] which API for best quality output

by TORRI Vincent

Hello, I am a newbie in the linux audio world and I have some stupid questions: I want to wrote an ogg player with great quality playback. I've already look at some other linux players and I've search this mailing list to find some answers. It seems that two APIs are interesting: ALSA and Jack. But i have not find some comparisons between these (and others) APIs concerning the output quality (regardless the sound card). Can someone give me some advice(s) about what API I should use (comments, links, etc...) so that I could start working on it? I would like to mention that I am not concerning about portability (only linux platform) or easy programming, and I just want the best quality output for this player. I hope this is not the most stupid question of this mailing list :) thank you best regards V.T.

22 years, 4 months

[linux-audio-dev] midi keyboard & alsa & timidiy suspend my whole system !!

by hexe_2003＠directbox.com

Hi! I bought a MIDI-keyboard a couple of days ago. It did not work correctly, and I described my prob at lau. They told me that my ESS-Solo1 card is not able to use MIDI ( under Linux or generally ?). Well, ok, I exchanged my card with my fathers ( ES-1379 or simular ). Alsa supports it, I configured it and can listen to sounds. If I start timidity in alsa mode ( "$ timidity -iA") and then attach my MIDI device with timidiy via "$ acconnect 64 128", my system completely hangs!!! I must reboot via the reset-button!! That's exactly the problem I had while I tried it ( the same way) with my ESS-Solo1. Well, I am using Debian unstable, alsa version 0.9.0.beta12, have a 2.4.21-xfs kernel installed. Secondly, RG4-sequencer is NOT able to start MIDI and I have no sound at all. Is it alsa's fault ? Is it mine ? greez Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 4 months

Re: Re: [linux-audio-dev] Linux VERSUS OSS ???

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: magusofthedark(a)yahoo.com To : linux-audio-dev(a)music.columbia.edu Date: 11.10.2003 00:45:38 > >The prob. w/ portaudio is it abstracts to OSS, not > >ALSA and I'd rather not take the least-common > >denominator road. > > No. PortAudio abstracts to a callback model. Its > closer to JACK than > either OSS or ALSA. It isn't any closer to ALSA than > it is to OSS. I phrased that poorly. Say someone has ALSA and doesn't have OSS compatibility. Would an app written in portaudio work on their sys? If it doesn't, then that's what I meant by that it doesn't abstract to ALSA. If it does, then What I said was wrong, my bad. -------- Like I understood portAudio's hp, portaudio is able to work with OSS. Secondly, alsa is able to deal with OSS-apps because of an, well, OSS-emulation. With other words OSS-applications are able to work with alsa, and they don't know that they are working under alsa ;). Ergo portAudio ( with it compatibility to OSS ) runs under OSS & ALSA and so under Linux generally. Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 4 months

Re: Re: [linux-audio-dev] Oss & threading -- is it possible

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: paul(a)linuxaudiosystems.com To : linux-audio-dev(a)music.columbia.edu Date: 10.10.2003 17:37:43 >Hello ! > >I've read somewhere that it is not possible that threads write different data to / >dev/dsp. >But how does Cheesetracker, for example, make it then? i don't how cheesetracker does it, but it requires user-space synchronization (e.g. pthread_mutex_(un)lock). with ALSA, you don't need to to do this - any thread can write to the device at any time. that's the theory, at least. in general, its probably a bad design to be doing that, much like it is for GUI programming, where its better to have a single thread mediate between the "device" and the rest of the program. ------------------ But well, If I synthize ( ? spelling) two signals and want to send them at the same time to the device, my first idea'd be: 1.) Open /dev/dsp, maybe O_NONBLOCK | O_WRONLY 2.) thread 3.) two threads calculate the both signals 4.) sync them 5.) two threads write their signals to /dev/dsp 6.) threads close certainly some of this. I mean mp3blaster, for example, have several pids while playing audio streams, and it is basicly OSS-programming and not alsa. Am I so wrong ? ;) Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 5 months

Re: Re: [linux-audio-dev] Linux VERSUS OSS ???

by hexe_2003＠directbox.com

>OSS is dead. You should not be writing apps with OSS. If you want >portability use PortAudio. Yes, if heared many good stuff about PortAudio .... where is the homepage ? Is it portable to NetBSD ( NetBSD is my "2nd OS" ;) ) __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 5 months

[linux-audio-dev] Linux VERSUS OSS ???

by hexe_2003＠directbox.com

Hello ! I am interested how 2.6.X Linux kernel will handle OSS. I mean that alsa is the driver-layer for these kernels, are OSS-drivers/applications still supported ?? greez, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 5 months

[linux-audio-dev] Question regarding the alsa's audio latency benchmark

by Ivica Bukvic

Hi all, I've had an interesting discussion with a professor and a distinguished member of the electroacoustic music community regarding audio latencies which made me realize that I did not understand the issue in its entirety. Hence, I looked around the net in order to educate myself. I soon stumbled across the following site: http://old.lwn.net/1999/0916/a/latency.html Admittedly, it's quite old but that, if anything speaks only in Linux's favor in terms of its pro-audio readiness. At any rate, I was checking out the benchmark data and was wondering as to how did this person/software app get to the 0.73ms buffer fragment that is equal to 128bytes? In other words, what sampling rate was used? 128 bytes in 44100Hz sampling rate = 3ms 128 bytes in 88200Hz sampling rate = 1.45ms 128 bytes in 176400Hz sampling rate = 0.725ms (this one being obviously closest, but at the same time, what kind of hardware supports this sampling rate, especially in 1999 when this test was done?) 128 bytes in 192000Hz sampling rate = 0.3ms So what gives? It seems like it is some kind of a 176k-ish sampling rate that, AFAIK does not exist. Furthermore, my question is what app was used to produce those graphs/results and whether these latency tests take into account hardware latencies (i.e. DSP converters, PCI->CPU->PCI->output etc.), in other words, is this latency that is achievable with the following setup: Input->soundcard->cpu(with some kind of DSP)->soundcard->Output Your help on this matter is greatly appreciated! Ivica Ico Bukvic, composer & multimedia sculptor http://meowing.ccm.uc.edu/~ico

22 years, 5 months

[linux-audio-dev] Audio in Museum powered by Linux

by Benno Senoner

Hi, yesterday was the opening of the "Southtyrol game", one of the worlds largest hand carved pinball style game machines. (length: 11 metres, weight: 2.6 tons, 16 audio speakers) It is an interesting combination of art, electronics and audio powered by Linux. The game is located in Southtyrol - Italy in a museum dedicated to tourism. The audio part was implemented by me. I created a webpage with a description and some movie clips that demonstrate how the game works. http://www.linuxdesktop.it/benno/southtyrolgame/ Thanks to all Linux developers in particular the LADers that made audio under Linux a viable solution ! comments ? PS: would such a story qualify for slashdot ? Just try to submit it if you want ;-) cheers, Benno http://linuxsampler.sourceforge.net ------------------------------------------------- This mail sent through http://www.gardena.net

22 years, 5 months

[linux-audio-dev] Call for participation: MMA GMPI working group

by RonKuper＠Cakewalk.com

The Generalized Music Plug-In Interface (GMPI) working group of the MIDI Manufacturer's Association (MMA) is seeking the input of music and audio software developers, to help define the technical requirements of GMPI. The objective of the GMPI working group is to create a unified cross-platform music plug-in interface. This new interface is hoped to provide an alternative choice to the multitude of plug-in interfaces that exist today. Among the many benefits of standardization are increased choice for customers, lower cost for music plug-in vendors and a secure future for valuable market-enabling technology. Like MIDI, GMPI will be license free and royalty free. Phase 1 of the GMPI working group's effort is to determine what is required of GMPI: What sorts of capabilities are needed to support existing products and customers? What are the emerging new directions that must be addressed? Phase 1 is open to any music software developer and is not limited to MMA members. It will last a minimum of three months, to be extended if deemed necessary by the MMA. Discussions will be held on an email reflector, with possible meetings at major industry gatherings such as AES, NAMM and Musik Messe. Following the collection of requirements in Phase 1, the members of the MMA will meet to discuss and evaluate proposals, in accordance with existing MMA procedures for developing standards. There will be one or more periods for public comment prior to adoption by MMA members. If you are a developer with a serious interest in the design of this specification, and are not currently a member of the MMA, we urge you to consider joining. Fees are not prohibitively high even for a small commercial developer. Your fees will pay for administration, legal fees and marketing. Please visit http://www.midi.org for more information about membership. To participate, please email gmpi-request(a)freelists.org with the word "subscribe" in the subject line. Please also provide your name, company name (if any) and a brief description of your personal or corporate domain of interest. We look forward to hearing from you. Sincerely, Ron Kuper GMPI Working Group Chair

22 years, 5 months

[linux-audio-dev] any LADCCA lists?

by "horsh

Hi, is there any LADCCA discussion mailing list? horsh PS: this is STRANGE my messages get through to LAU list okay, but I have to resend this particular message to LAD third time (I subscribed) and get no notifications, and don't see my messages in archives.

22 years, 5 months

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Linux-audio-dev