Linux-audio-dev March 2006

linux-audio-dev@lists.linuxaudio.org

87 participants
76 discussions

by Bradford Garton

Hey everyone -- Sorry about the multiple postings, but I figured what the heck... I've just put on-line a whole lot of work I've done; papers, pieces, software, etc. Here's the link for the 2-3 people (beyond my immediate family) who might be interested: http://music.columbia.edu/~brad/ There's a fair amount of unix/linux work scattered throughout, including the big "My Music Book" thing I did a few years ago. Hope you enjoy this! brad

18 years, 5 months

Re: [linux-audio-dev] 3D fft analysis program

by Downer

> I'm hoping that you're thinking of a realtime display, in which the > peaks roll off to create a true waterfall effect. Baudline (http://www.baudline.com) is a fantastic viewer that does fft cascade. I've used it for a couple of years, and it is great for figuring out how different sounds "work", and it has an oscilloscope-type display as well. Cheers, Jason Downer

18 years, 6 months

[linux-audio-dev] Drum synth

by Dmitry Baikov

Hello. I finally started making my pet music project and realized I need a drum synth to make some cool sounds. psindustrializer is good but also need some tr-909-style sounds. I remeber from my old windoze days I used a nice piece of software called Stomper. Does anybody know any software for linux with comparable capabilities? Or we need to write one? Stomper does not work under wine :( Thanks.

18 years, 6 months

[linux-audio-dev] Re: Drum synth

by Juhana Sadeharju

Hello. I had a couple of articles on drum synths. Check ftp://ftp.funet.fi/pub/sci/audio/devel/lad/drumsynth/ I built the circuit in a00*.jpg at the time when this article was fresh. The article b00*jpg mentions an earlier article. I will check that out at library. Hmm.. I coded a drum synth for Commodore VIC-20 at the time. VIC provided an audio chip with three oscillators, noise, and a common volume if I remember correctly. What I did was to modulate osc pitch and volume parameters with a fast and accurate (compared to Basic) assembly code. The drum sounds were assigned to the keys. This was about 1984, inspired by Yamaha's digital RX drum synths, not by analog drums. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 6 months

[linux-audio-dev] [ANN] No More Specimen

by Pete Bessman

Ladies and Gents, I can hack specimen while working full time. And, I can hack specimen while studying full time. But, and this is empirically verifiable, I can't hack specimen while both working and studying full time. And my situation is not likely to change for another year or so. What this means is that I'm just not cut out to run a project right now, unless I want to put it into maintenance mode. Really, that's where specimen has been for the past six months anyway, and I've been doing a rather piss poor job at that modest role! My efforts are better applied to tasks where smaller chunks of time can go a greater distance. I don't have any regrets --- this was my first real programming project, and I learned a lot. But the truth is that LMMS is more specimen than specimen right now, and it has an active development and user community surrounding it. Plus, I've always been a musician and an artist first, and a programmer second. All told, it's time to throw in the towel on this one. In a way, this is a bummer --- I've put a lot of sweat and tears (literally) into this project over the past couple of years, and it has come an incredible distance. But I'd be a fool to think that I'm better off keeping it afloat than making music and contributing to other projects. And truthfully, it's a huge relief to get this announcement out. A sense of obligation is what kept me from making it sooner, but in retrospect, that's pretty ridiculous. Considering that I'm an "open source, just for fun" guy, and not a "free software, as in freedom" type, it doesn't make a lot of sense to keep going when pain exceeds pleasure. This isn't the end of my open source music development, however. I hope to help take LMMS to the next level, and contribute to other projects that will help make Linux a competitor in the music industry. Things like ardour2, lash, jack-midi, vst, dssi, ladspa et al are the keys to our future in this regard. And I look forward to getting back to hardcore hacking in a few years, when I've got my life settled down and I'm not putting in 80 hours of work and school a week. Take care everybody, and may the funk be with you. -- Pete Bessman http://gazuga.net "So this baby seal walks into a club."

18 years, 7 months

[linux-audio-dev] fast linear resampling on ARM - suggestions?

by Tobias Scharnberg

Hello List, I'm trying to find a library or code-snippet in order to do audio resampling from 8khz to 44,1khz and from 44,1khz to 8khz. I need to resample the data in realtime - resampling a buffer of data, not a soundfile. The quality doesn't need to be good so I guess the best solution might be linear audio resampling. The device to do the resampling on is an ARM CM-X255 running at 400MHz. I tried out libsamplerate so far but when I tested it with the soundfile conversion test program it needed 3,5 secs to sample from 8kHz to 44,1 khz for a 1,7 secs audiofile - which is too slow for me. Is there something faster that can do the job? Any suggestions are highly welcome Greetings, Tobias

18 years, 7 months

[linux-audio-dev] Re: [linux-audio-user] regarding the 2nd Book Of Linux Music & Sound

by Dave Phillips

Greetings: First, thank you to everyone who responded to my original query. I now have a much better idea how I want to do this project. I definitely want to involve members of this group. Some of you have offered to take on particular chapters, and that seems to me the best approach. I believe we can complete the work in record time by spreading the work around. I'll speak with my publisher about this plan. If he approves this approach we'll start work immediately. Some respondents wrote to me off-list and have offered to assist. I'll be in touch with you all after talking with Bill Pollock. If Bill gives us a green light I'll start organizing the distribution of work immediately. I'll communicate directly with you regarding style preferences, format requirements, deadlines, etc. I must emphasize that this project is commercial work, i.e., we'll have editors at the publishing house and there will be demands that certain dates be met. Please, only take on the work if you're sure you can work under those conditions. If the community approach is accepted I'll post a list of topics and areas that need attention. I have a large amount of unedited/incomplete material that I'm willing to offer as starting points. I've been thinking about the royalties issue. I'm far from a final plan, but I think it might be possible to route some (all?) of the royalties to the Linux Audio Consortium. The community can then decide how to use it. I can't leave this issue vague, my publisher will need to know who is in charge of accounts receivable, and I can't simply accept contributions from the community and not reimburse those contributors. How that reimbursement takes place can be left to the individual contributors, or we may decide to simply throw everything in one direction (e.g. linuxaudio.org). Btw, I especially appreciate the community's response re: the 2.4 kernel series. It is laid to rest, there will be coverage only from kernel 2.6 upwards. Thank goodness. No Starch has already accepted my outline for the project. At some point I'll post that outline on the Web for the community to consider. However, please bear in mind that there will be limitations of space and scope. I'm unlikely to be able to cover games, consumer devices, or telephony. Alas, material for a programmer's guide will probably not be accepted. IMO that really requires a separate book now. A developer's guide to ALSA and JACK is certainly timely and needed, but I'm not the one to write that book. Again, if you're interested in writing for this project please contact me off-list. Specify your area of interest and we'll go from there. Best regards, dp

18 years, 7 months

[linux-audio-dev] newbie problem compiling ladspaSDK on mac

by Libero Mureddu

Hi to everybody, I am new to this list. Many thanks to all the developers, It's already more than two years that I'm a happy user of free software for music on my ibook. But only recently I've decided that it's worth to learn woh to compile and install by myself the softwares that I use more often. I'm using a lot the LADSPA plugins packaged for os x, but I'm trying to compile the ladspa sdk. I've modified the makefile following the patch provided with fink, and the compilation seems to go well. However, at the end, I get the following error: ../bin/analyseplugin ../plugins/amp.so ../bin/analyseplugin ../plugins/noise.so time ../bin/applyplugin -s 1 \ ../snd/noise.wav /tmp/test.wav \ ../plugins/filter.so lpf 500 \ ../plugins/filter.so lpf 500 \ ../plugins/sine.so sine_fcaa 6000 \ ../plugins/delay.so delay_5s 1 0.1 \ ../plugins/amp.so amp_mono 4 \ Unable to find label "lpf" in plugin library file "../plugins/filter.so". 0.01 real 0.00 user 0.00 sys make: *** [/tmp/test.wav] Error 1 Can someone help me to solve this problem? I'm using mac os 10.4.4 on a g4 ibook. Regards, Libero Mureddu

18 years, 7 months

[linux-audio-dev] regarding the 2nd Book Of Linux Music & Sound

by Dave Phillips

Greetings: My publisher, Bill Pollock, has been gently pressuring me to commit to completing the 2nd edition of The Book Of Linux Music & Sound. Unfortunately I'm in a precarious position to commit myself to the work. The first book nearly wiped me out, I'm not sure I can sustain the effort to bring the next edition to light. Nevertheless, I'm still interested in seeing this book through to completion. So I have some questions for the community : 1. Is there a real need for another book such as the The Book Of Linux Music & Sound ? 2. If so, would I be wise to ignore the 2.4 kernel series ? (It would make it easier to ignore material re: OSS/Free) 3. Would anyone be interested in co-authoring the book ? I've considered offering some chapters to certain people on these lists, but the issue of reimbursement gets sticky WRT royalties and other compensation. I made very little money from the first book, but money wasn't the true reward anyway, so perhaps there's a way to turn it into a community-based work. 4. Is anyone else already working on such a project ? I don't want to duplicate efforts. Btw, this is the last hurrah for this project. If I don't take it now I won't be taking it on at all. I have a life, it's pretty full, and committing to this edition would be a major disruption. I can guarantee that it would be the last book I'll ever write. I look forward to your comments and advice. Best regards, dp

18 years, 7 months

[linux-audio-dev] Re: fast linear resampling on ARM - suggestions?

by Kjetil S. Matheussen

"Tobias Scharnberg": > > Hello List, > I'm trying to find a library or code-snippet in order to do audio > resampling from 8khz to 44,1khz and from 44,1khz to 8khz. I need to > resample the data in realtime - resampling a buffer of data, not a > soundfile. The quality doesn't need to be good so I guess the best > solution might be linear audio resampling. The device to do the > resampling on is an ARM CM-X255 running at 400MHz. > > I tried out libsamplerate so far but when I tested it with the > soundfile conversion test program it needed 3,5 secs to sample from > 8kHz to 44,1 khz for a 1,7 secs audiofile - which is too slow for me. > > Is there something faster that can do the job? > Was this with the linear resampler lib libsamplerate? In case, you should know that its terrible slow. Last time I tried, the fastest sinc resampler in CLM was almost as fast as the linear resampler in libsamplerate. (Erik, you should do something about that...) I don't know of any other libraries that does linear resampling, but its not that difficult to make one manually. I'm sure there are example codes floating around as well.

18 years, 7 months

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Linux-audio-dev March 2006