Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7440 discussions

by Juhana Sadeharju

Hello. What is "/dev/shm"? How it is used? "df" shows: none 62812 0 62812 0% /dev/shm What about the following idea? My LADSPA plugin would allocate a segment of shared memory from "/dev/shm". That is possible because most likely all Linuxes have that device. Then somehow I create a backdoor for LADSPA controls. The backdoor goes through the shared memory segment. Finally, I would write an independent GTK application which provides my own GUI to the plugin. If one does not use the GTK application, then all what is available are controls provided by the host. Regards, Juhana

20 years, 7 months

[linux-audio-dev] Ecasound question

by Alfons Adriaensen

Hi, I've been trying to use ecasound for multitrack recording with a Terratec EWS88MT. This card does not present the same number of capture and playback channels (12/10 or 10/12, I always forget since I'm only interested in the first 8 of each). Apparently, ecasound trips over this - whatever number of channels I try, the reply is always that the 'channel count is not available' or something similar. Is there an easy solution for this ? Second question: how do I connect an ecasound chain to a specific channel of my card ? There seems not to be any way to specify this. Thanks a lot ! -- FA

20 years, 7 months

[linux-audio-dev] wcnt linear filters

by James W. Morris

Greetings I wondered if it is possible to add resonance to my filters in wcnt. They only use an array and calculate the mean average of the contents according to cut off freq. At the moment I've removed my p**s poor efforts at creating resonance and added a feedback loop instead. Is it possible to code resonant linear filters which use an array as I do, or will I have to go on a higher mathamatics course and get my head round fancy bi-carbonated equations? Oh yeh, wcnt is open source... and uses a text file interface only and is not-real-time toodle do James ~(sirromseventyfive)~ What's wrong with *ahem*RTsynth/didgeridoo*ahem* - I've not got the processing power to try all this stuff out. _________________________________________________________________ Express yourself with cool emoticons - download MSN Messenger today! http://www.msn.co.uk/messenger

20 years, 7 months

[linux-audio-dev] Re: Project: modular synth editor

by Juhana Sadeharju

>From: torbenh(a)informatik.uni-bremen.de >> >> all of GTK is slowly migrating toward a client-side compositing model >> based on Cairo. do not expect the GTK crew to be supportive of any >> attempts to fix up the existing canvas/widget dichotomy. > >where do i find info on that ? http://www.cairographics.org There seems to be a lot of more than Cairo thing. I started downloading all for offline reading and next day I had 1.5 gigs of stuff and had to quit the download before it completed. Regards, Juhana

20 years, 7 months

[linux-audio-dev] libao?

by Juhana Sadeharju

Hello. I noticed libao is required by mpg321 and vorbis. About half of the time I start mpg321 I get the following: unix_connect: can't connect to server (unix:/tmp/mcop-juhana/localhost_localdomain-06be-400786ed) Can't find a suitable libao driver. (Is device in use?) Very annoying. Why libao fails? Why it is needed? Any alternatives? Regards, Juhana

20 years, 7 months

[linux-audio-dev] ".mid" files playing in Linux games

by Dominic Genest

Hello, I am programming some little games in Linux as a hobby, and I composed midi files that I would like to be played in the background. What is the easiest way to do this so that it works on all platforms for everyone ? I would like suggestions of real time synthesizers that can read ".mid" files. Does anybody know of any library that just does all the work to send wave output to sound cards from a ".mid" file ? Also, I would like not to have to supply instrument files. Thanks a lot for any answer or clue ! Dom -- Dominic Genest Étudiant 3e cycle Département d'Informatique et de Génie Logiciel Université Laval 97010111

20 years, 7 months

Re: [linux-audio-dev] ".mid" files playing in Linux games

by John Lazzaro

On Feb 1, 2004, at 4:01 AM, linux-audio-dev-request(a)music.columbia.edu wrote: > Ryan Underwood <nemesis-lists(a)icequake.net> wrote: > > Module files are usually a reasonable compromise between quality and > size for soundtracks. The disadvantage of tracker files compared to > MIDI is that they are larger since they contain the samples. The > advantage is that you know they will sound identical no matter where > they are played and whether or not the end user has MIDI hardware or > not. MPEG 4 Structured Audio (SA) was designed to solve this problem, in that its normative (sounds the same everywhere), but if you have algorithmic synthesis techniques you like, there's no need for samples, and so the files can be very small. SA been through a few Corrigenda (i.e. bug-fixes to the standard), so its a pretty stable standard now. See: http://www.cs.berkeley.edu/~lazzaro/sa/index.html Note: I'm not an MPEG member, the paragraph below is my own personal opinion, and doesn't reflect MPEG's view on the topic: I'm starting to think that what could help SA find its way into applications is a strict sub-setting of the language -- pick a simple to implement subset of keywords and opcodes that solve a lot of useful problems, and code up interpreters and compilers that accept only the subset. The content would be upward-compatible with full SA decoders (like sfront), but if the subset was well chosen, the complexity of implementing SA would shrink to the point where a motivated undergrad could do it as a senior project. The hope would be that once there was momentum, the people-power to do full implementations would appear, or the will to standardize the subset in MPEG would appear. --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---

20 years, 7 months

[linux-audio-dev] branch-free denormal killer

by Simon Jenkins

Had the idea that you could kill denormals without branching if you didn't mind "injuring" nearby numbers that weren't quite denormal: /* branch-free denormal killer */ inline float FlushToZero( volatile float f ) { f += 9.8607615E-32f; return f - 9.8607615E-32f; } /* end */ This function leaves anything higher than 9.8607615E-32 (ie 2 ** -103) completely unchanged. Numbers below this value lose one bit of precision for each binary order of magnitude they are below it. This has the effect that denormal numbers lose *all* their precision, ie they become zero. Simon Jenkins (Bristol, UK)

20 years, 7 months

[linux-audio-dev] Ann: Specimen v0.1.0 (the first beta release)

by Pete Bessman

Too everyone who's waited with bated breath for this day to come (primarily me), rejoice in the first beta release of Specimen, a midi controlled audio sampler for GNU/Linux systems. Features as listed on the webpage: # ALSA sequencer interface support. # Audio output via ALSA or JACK. # Individual panning and volume controls for each patch. # High quality cubically interpolated pitch scaling. # Sample start/stop and loop points. # Three playback modes; "normal" just plays the sample, "trim" plays the sample and stops early if so instructed, "loop" plays the sample for the requested duration. # Patch bank saving and loading in the "beef" file format. Check out www.gazuga.net for more and to download the source. I'm gonna spend the next few days giving the program a usability test and creating a demo song that does it justice, so keep your ears open for some homegrown UHB in the not-too-distant future. [pb]

20 years, 7 months

Re: [linux-audio-dev] creamcheese

by James W. Morris

creamcheese... little bit twee, perhaps, but, nice and pleasant, definately category C for chilled, reminded me of aphex twins rarer chilled moments. I liked it. But the ending , suffered a little from what I've come up against when I've done tracks, and thats not quite knowing how to end it? leaving it slightly unresolved sounding. But that's after just one listen, so don't take what I say too seriously ;) jwm ~(sirromseventyfive)~ >Would this (http://dis-dot-dat.net/creamcheese.mp3) do for b or c? >The call seems to want classical for category b, so probably c would >fit best. > >If anyone else would like to have a listen, I'd appreciate that very >much. Comments, criticism, cheques are all gratefully accepted :) _________________________________________________________________ Express yourself with cool new emoticons http://www.msn.co.uk/specials/myemo

20 years, 7 months

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Linux-audio-dev