Linux-audio-dev March 2005

linux-audio-dev@lists.linuxaudio.org

68 participants
63 discussions

[linux-audio-dev] Re: [OT] Ogg Vorbis stream

by Juhana Sadeharju

>From: Jens M Andreasen <jens.andreasen(a)chello.se> > > $ ogg123 http://oggtrial.nm.cbc.ca:80/cbcr2-toronto.ogg > >It is only 32Kbit but, considering the low bandwith, sounds amazingly >good. There are some annoying artifacts though: > > Piano, Viola da Gamba etc "flutters" reminiscent of a cassette player. [ ... ] >Oh, and remember to visit their feedback section to give them a thumbs Thumbs down, I hope. mp3 flutters/bubbles as well at low rates. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

19 years, 9 months

[linux-audio-dev] Re: Any interest in DVD-Audio?

by Juhana Sadeharju

>From: Alfons Adriaensen <fons.adriaensen(a)alcatel.be> >> >> Why not? Flac + open DVD-audio format for N channels. > >Do you know any DVD-A player that has a FLAC decoder built in ? >The DVD-A spec does not allow anything but MLP, or no compression, >so no manufacturer will ever make such a thing. If EU wants that other media players should run in Windows, perhaps EU would look bad the DVD-Audio spec as well. Whoever designed the spec, it was stupid not to look around for non-patented/non-proprietary lossless format as an alternative. We just have to work out the suitable modification/extension to the spec. How vdix/dvix format ended up to be a standard in DVD video players? How mp3-discs in CD player? And how the various copycontrol systems on CDs? Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

19 years, 9 months

[linux-audio-dev] RME HDSP MADI drivers?

by Marije Baalman

Hi, this question is mostly for Thomas Charbonnel, I suppose, as he was working on this a while ago... Is the Alsa driver for the RME HDSP MADI already up and running? sincerely, Marije

19 years, 9 months

[linux-audio-dev] Any interest in DVD-Audio?

by Dave Chapman

Hi, Hopefully this is within the scope of this list but following a lot of recent googling, there doesn't appear to be any interest in "open-sourcing" anything related to DVD-Audio. As you may know, commercially authored DVD-Audio disks have three very unfriendly features - encryption, watermarking and Meridian Lossless Packing (MLP). I am assuming that these are some of the reasons developers have not become interested in DVD-Audio. However, none of those features are compulsory, and if you remove those obstacles (which I am not interested in overcoming - simply avoiding), you are left with a standard which allows 18 combinations of samplerate and sample wordsize for 2-channel stereo audio (including 16-bit/44.1KHz RedBook, and going all the way up to 24-bit/192KHz), plus a range of 6-channel uncompressed surround sound formats. My aim is to produce a set of GPL'd tools to both author, "un-author", and play such unencrypted, uncompressed disks, and am curious to know if any other developers have an interest in this area or not. To this end, I've started the "dvd-audio" project at sourceforge - http://sourceforge.net/projects/dvd-audio/ I have not yet populated the site with HTML content or any of the software I'm in the process of developing, but there is a "dvd-audio-devel" mailing list which anyone is welcome to subscribe to. I should reiterate that I'm not interested in investigating features such as encryption or MLP - I simply wish to be able to author my own unencrypted and uncompressed DVD-Audio disks using my own music, which I can then play back either on my hardware DVD-Audio player or on my PC, all using free software Regards, Dave.

19 years, 9 months

[linux-audio-dev] OSC, mDNS and LASH: a good combo?

by Martin Habets

My impression is that more and more applications are moving to OSC for inter-process communication. Question 1: Are most audio/midi applications converging on OSC? Are there any moving away from it? Or are there other strong contenters in this area? AFAIK all linux audio/midi applications use an arbitrary UDP port number, and rely on manual configuration of this for the server and all clients. With OSC popularity increasing this will pose a growing problem for end users who have to configure the ports, and for developers of client programs that want to interact with multiple servers. The answer to this issue is service discovery, which was recently discussed on the OSC_dev list [1]. That thread leads to a product called howl [2], which is an open implementation of mDNS/redezvous/ zeroconf (take your pick). It provides 3 daemons (of which 2 should be run) and some libraries. Using this implementation all applications would (ideally) register or discover services using the howl libraries. Apart from this, the programs would communicate via OSC. To me this seems like a lot of overhead for a relatively small gain. OTOH it seems like a very flexible and future-proof solution. An alternate way I've been considering is an OSC-based service discovery daemon. It would accept OSC messages to register and discover services. The advantage of this is that it only uses 1 small daemon, but more importantly that applications do not need to use any additional libraries besides the OSC one (<insert liblo plug here> :). So far I can see 6 input messages for such a daemon, with 4 response messages. The disadvantage is that the daemon would still need an arbitrary port number, and all applications would need to know it (at least for a while). For intra-host discover the daemon could still interact with howl or something like it if that is needed. But if this approach is successfull we could request one dedicated port from IANA. Question 2: Are there other better alternatives? Question 3: Which alternative is better or do you prefer? (mDNS/OSC-daemon) The only thing I haven't mentioned yet is LASH. Well, in my opinion it is the prime example of an application that needs to interact with all other linux audio/midi appications. As such, I think it could gain most from a service discovery scheme. And there has been talk about using OSC for it [3]. Comments/suggestions/questions? Blast away! Phasers on stun please! And Steve: appologies for stepping on your turf. Best regards, -- Martin [1] http://www.create.ucsb.edu/pipermail/osc_dev/2004-December/000841.html [2] http://www.porchdogsoft.com/products/howl/ [3] http://music.columbia.edu/pipermail/linux-audio-dev/2004-August/009288.html [4] http://www.cnmat.berkeley.edu/OpenSoundControl/ --------------------------------------------------------------------------- 30 years from now GNU/Linux will be as redundant a term as UNIX/MERT is today. - Martin Habets ---------------------------------------------------------------------------

19 years, 9 months

[linux-audio-dev] specs for 1/3 octave filters

by Alfons Adriaensen

Hello, I'm looking for the 'official' (ANSI/IEC/ITU/???) specs for the set of 1/3 octave bandpass filters used for sound analysis. ISTR there are different grades, depending on precision and filter order. If someone would have them (or a pointer) please drop me line. TIA, -- Fons

19 years, 9 months

[linux-audio-dev] [OT] Ogg Vorbis stream

by Jens M Andreasen

Hi! CBC Toronto is evaluating the Ogg Vorbis format for Internet streaming. You can find it here: $ ogg123 http://oggtrial.nm.cbc.ca:80/cbcr2-toronto.ogg It is only 32Kbit but, considering the low bandwith, sounds amazingly good. There are some annoying artifacts though: Certain announcers gets very metallic voices Piano, Viola da Gamba etc "flutters" reminiscent of a cassette player. Any idea why it flutters? Is it my player, their encoding setup or perhaps a limitation in the Vorbis codec itself? Oh, and remember to visit their feedback section to give them a thumbs up :) -- ( ) c[] // Jens M Andreasen

19 years, 9 months

[linux-audio-dev] [ANN] liblo 0.18

by Steve Harris

http://www.plugin.org.uk/liblo/releases/liblo-0.18.tar.gz This is bugfix release and fixes a critical bug in 0.17 that bites when trying to connect multiple clients to one server. All users of 0.17 should upgrade as soon as possible. Liblo is an implementation of the Open Sound Control protocol for POSIX systems. It is released under the GNU General Public Licence. http://www.plugin.org.uk/liblo/ http://www.cnmat.berkeley.edu/OpenSoundControl/ - Steve

19 years, 9 months

Re: [linux-audio-dev] OSC, mDNS and LASH: a good combo?

by lazzaro

Hi everyone, Just a quick note on discovery from the RTP MIDI experience: http://www.cs.berkeley.edu/~lazzaro/rtpmidi/index.html The assumption we're making is that existing IETF session management tools -- the Real Time Streaming Protocol (RTSP) for applications that feel like content distribution, and the Session Initiation Protocol (SIP) for applications that feel like telephony -- will be the way RTP MIDI (together with audio and video and text, etc) sessions will get set up, and that the mechanisms these tools use for discovery will be used for RTP MIDI. On SIPPING (the place where new SIP frameworks are born and raised): http://www.ietf.org/html.charters/sipping-charter.html there has been a lot of activity recently about "p2p SIP architectures", which in a LAN context is the sort of discovery people are talking about here (link-local multicast, the backbone of mDNS, is the LAN tool at the bottom). But there's also an interest in making these p2p SIP architectures work outside a LAN context, which is where the "p2p" comes from -- they look for inspiration from the file-sharing world for discovery (Distributed Hash Tables, etc) ... Also, note that basic SIP already has some link-local multicast support -- a new phone coming on line can sent a REGISTER to a well-known local multicast address and port, where any SIP proxies online will be listening. This doesn't solve the bigger question of how you make an architecture where even phone is also a SIP proxy, and act to serve each other ... which is what the SIPPING work is about. --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---

19 years, 9 months

[linux-audio-dev] Re: ICMC2005 Paper Deadline less than 10 days away!

by Juhana Sadeharju

>From: Pau Arumi <parumi(a)iua.upf.es> > >Please note that the ICMC 2005 ( September / Barcelona ) paper >submission is less than 10 days away! We urge everyone to post their >papers to the suvisoft system as soon as possible to prevent any last >minute problems. >For details on submissions see http://www.icmc2005.org/ Please request or make sure that your paper will be placed "open access" after the conference. Or submit to conferences already making their papers "open access", like DAFX. Does anyone have the earlier ICMC conference papers conveniently available as PDF files and could make them all available for me? I would like to go through all ICMC papers back from 1980ties. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

19 years, 9 months

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Linux-audio-dev March 2005