Linux-audio-dev

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7513 discussions

[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, 6 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, 6 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, 6 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, 6 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, 6 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, 6 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, 6 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 ---------------------------------------------------------------------------

20 years, 6 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

20 years, 6 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

20 years, 6 months

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Linux-audio-dev