Linux-audio-dev

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7516 discussions

[linux-audio-dev] IUPUI Student Radio Station should be based on Linux

by ben racher

Hello, I'm starting a student radio station at IUPUI in Indianapolis, Indiana and I want our entire audio infrastructure to be based on Linux. I've got a rough sense of all the apps we need and what apps to setup on which computers, but I thought I'd run the blueprints by you guys to see if you could give me any feedback. Streaming/Web Server: Runs apache and icecast or the icecast mod for Apache. Automation Computer: Runs some sort of playback program, I've been keeping my eyes on LiveSupport http://www.campware.org/ to schedule and automate the station when DJs aren't present. Audio Archive: File Server for our digital library, probably all FLAC files, maybe Ogg, but I think we want FLAC in case we want to burn CDs. And this is the part that I need help on... Production Computer... so I've been tooling around with JACK and Ardour and MusE (not to be confused with MuSE) and other JACK apps and its all really cool and exciting. I never got the sound input to even really work in linux until a couple weeks ago. Yay for the 2.6.8+ kernels. So here are my thoughts on setting up a workstation, and I don't even know if this is possible, but that's why I'm mailing you guys. One department has kindly donated a brand new Dell Poweredge Dual Xeon 2.4 ghz somethin or other. The rest of our computers are from the university junkyard of midgrade PowerPC G4s and Pentium 3s. So the Poweredge is our gem computer out of all the other crappy computers. Is there any way for me to set up the speedy new poweredge as some kind of audio production renderfarm, and get the PPCs and the Pentium 3s to connect to it as production terminals? Cause, although multi-tracking on the G4s and Pentium 3s is possible, doing extensive work with FX plugins is probably out of the question. See what I'm getting at? Also, the Poweredge also has about a 500gb raid system with it, which would be nice to use for storing our audio on and maybe even using as our digital archive as well, but that might be pushing it if we are doing audio production work on it as well? I'd imagine this might be the case, but I don't see why ftping flac files on a local network would be too much of a burden on the raid drive or dual processors. Another reason why it would be nice to be able to connect to a poweredge remotely to do audio work, is that it the poweredge makes about as much noise as a 747. So... its not exactly an audio production friendly unit. So these are my thoughts. Am I crazy... or is there some magical way to make this happen? - Ben Racher bracher(a)iupui.edu

20 years, 7 months

Re: [linux-audio-dev] Developing and audio driver

by fred doh

--- james(a)dis-dot-dat.net wrote: > On Thu, 10 Mar, 2005 at 07:42PM -0500, Dave > Robillard spake thus: > > On Wed, 2005-09-03 at 23:13 -0800, fred doh wrote: > > > Hi, > > > > > > I need to develop an audio driver (OSS on kernel > 2.4) > > > for a new hardware. I didn't find any resource > > > explaining how to do that, besides looking at > the > > > sources of other drivers. Could someone direct > me to > > > an appropriate resource? > No offence meant, but from your questions, you have > less of a clue > than I do, and I wouldn't fancy writing a driver > from scratch. > > Are you sure you're not biting off a little too much > here? > > On the othe hand, even if you give up half way > through, you'll > probably have learned a hell of a lot. > > But, as Dave says below, why? OSS? 2.4? Are there > good reasons for > this? > > Why on earth would you write an OSS driver for 2.4 > at this point in > > time? > > Writing for OSS is a constraint, not a choice. I'm not starting from scratch there is some older driver that I have to port, and it's been written for OSS. Later if there is time for it I will make the ALSA conversion. I've read docs about doing kernel drivers so my questions are not general about drivers, but really directed at audio drivers. I didn't find any resource about it. The OSS doc seems to be directed to the user of the API and not for the driver developer. For example, which function from the file operations structure have to be implemented and for what purpose in the case of audio? -fred __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 8 months

[linux-audio-dev] Delta 1010/ALSA fluke

by Aaron Trumm

Hello. I wonder if anybody has any ideas on this one: I'm running a gentoo 2.4 kernel with a Delta 1010 sound card, wrote an asound.conf to route audio to various channels for multiple instances of mplayer - very cool - but this fluke happened this morning that it'd be awesome to understand... I got in and it had been looping three mplayer videos (mpgs) all night. They had gotten janky, ie: weren't really playing anymore, so I did a killall mplayer - nice. Then I tested some play back, one at a time, of the same movies. They routed fine, everything was great, except, on analog outputs 3, 5 and 7 (not 1), the audio was a little garbled. Like a digital garble type of thing almost sounding like a sample rate mismatch or something. I tested with an .mp3 and the same happened, and I tested an mp3 with alsaplayer and it happened, and then I did the tests again, and the second time, the .mp3 and the alsaplayer instance didn't do the weird thing, but the .mpgs still did it. So I rebooted it and it went away. *shrug* Anybody have any ideas on that? ----------------- Aaron Trumm www.nquit.com -----------------

20 years, 8 months

[linux-audio-dev] Developing and audio driver

by fred doh

Hi, I need to develop an audio driver (OSS on kernel 2.4) for a new hardware. I didn't find any resource explaining how to do that, besides looking at the sources of other drivers. Could someone direct me to an appropriate resource? Also, I need to build the driver for a target kernel that is not the one I'm currently running. I'd like to have the driver building with the target kernel and to have it included in the config options when I do a "make menuconfig". Is there an article explaining how to do that? Thanks, -fred __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 8 months

[linux-audio-dev] Anyone interested in helping with melotron

by Julien Claassen

Hi! At http://freepats.opensrc.org there is a mellotron sample in the flac format. I'm very interested in this sound. I'd like to see it in a soundfont, so it can be used with fluidsynth. Unfortunately I only can convert this sample to the .wav or .raw format and split the different samples from one another. The actual soundfont creation (with swami) I can't do. Would anyone be interested in this kind of project? As said I'd convert and split the flac file and do, what else I can, but for the final swami-touch, I'd need some help, because I'm blind. I'm looking forward to hear from someone! Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net - the Linux TextBased Studio guide

20 years, 8 months

[linux-audio-dev] Re: Welcome to the "linux-audio-dev" mailing list

by krsrtn

hi list, I have problems installing the emi26 on my box running fc3 & ccrma. I rebuilt a kernel with the necessary module and reinstalled alsa afterwards. it looks fine actually, even when I start alsa it loads the module for the emi26. unfortunately it does not work yet. what did I miss out?? my settings in modprobe.conf look like this:: alias snd-card-0 emi26 alias sound-slot-0 snd-card-0 options snd-card-0 index=0 alias snd-card-1 snd-usb-audio options snd-card-1 index=1 alias snd-card-2 snd-intel8x0 alias sound-slot-2 snd-intel8x0 options snd-card-2 index=2 alias snd-card-3 snd-virmidi options snd-card-3 index=3 I also did 'depmod -a' afterwards and restarted alsa. the messages seemed to have emi26 loaded, also when I do this:: [karlos@posthuman ~]$ lsmod Module Size Used by snd_virmidi 8384 0 snd_seq_virmidi 12288 1 snd_virmidi snd_seq_midi_event 12032 1 snd_seq_virmidi snd_seq 59536 2 snd_seq_virmidi,snd_seq_midi_event snd_intel8x0 36800 1 snd_ac97_codec 76792 1 snd_intel8x0 snd_usb_audio 70336 0 snd_pcm_oss 57632 0 snd_mixer_oss 23552 2 snd_pcm_oss snd_pcm 99204 4 snd_intel8x0,snd_ac97_codec,snd_usb_audio,snd_pcm_oss snd_timer 30340 2 snd_seq,snd_pcm snd_usb_lib 17408 1 snd_usb_audio snd_rawmidi 29472 2 snd_seq_virmidi,snd_usb_lib snd_seq_device 13196 2 snd_seq,snd_rawmidi snd 62052 13 snd_virmidi,snd_seq_virmidi,snd_seq,snd_intel8x0,snd_ac97_codec,snd_usb_audio,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_usb_lib,snd_rawmidi,snd_seq_device soundcore 14304 2 snd emi26 168704 0 but it is not claimed by any device. I have it connected and the blue LED it lit, so I wonder what the heck I do wrong. should I see more lights, green ones? I have not used the emi26 with something else so I don't know. any ideas? thanks, Karsten

20 years, 8 months

[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

20 years, 8 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

20 years, 8 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

20 years, 8 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.

20 years, 8 months

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Linux-audio-dev