Linux-audio-dev August 2005

linux-audio-dev@lists.linuxaudio.org

55 participants
47 discussions

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, 7 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, 7 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, 7 months

[linux-audio-dev] Re: lad design patterns

by Juhana Sadeharju

>From: "Levi D. Burton" <ldb(a)puresimplicity.net> > >does the idea of documenting various lad design patterns make >sense to anyone? Such "LAD Gems" doc would be much needed here too. (For audio dsp gems, take a look at "musicdsp.org".) I would appreciate if somebody would take a look at Ardour and document best gems found there. E.g., the GUI and audio thread separation and start up sequences. Likewise for Linuxsampler and one of its GUI frontends. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 10 months

[linux-audio-dev] Proffessionals?

by james＠dis-dot-dat.net

Hi everyone, Can anyone give me any examples of Free audio software being used by professionals? Anywhere where it performs better, or simply doesn't cost two or more body parts to use? Quick answers get bonus points. James -- "I'd crawl over an acre of 'Visual This++' and 'Integrated Development That' to get to gcc, Emacs, and gdb. Thank you." (By Vance Petree, Virginia Power)

19 years

[linux-audio-dev] Real time delay tutorials?

by Iain Duncan

Anyone have a good suggestion for a tutorial for making accurate high-resolution high-priority clocks in C? I found some tutorials but they were kinda old, so wondered if they might be out of date as to how far real-time scheduling has come on linux. I want to be able to wake up a pthread very accurately. Thanks Iain

19 years, 2 months

[linux-audio-dev] Radio Scanner Recorder

by Guillaume Filion

Hi all, I'm pretty new to the world of audio on linux, so please excuse the "newbeeness" of my question. :-) I'm a in the process of making a police/EMS/fire radio recorder. At first, I tought of doing a program similar to ScanRec(1) from the windows world -- that is not record when the sound is below a certain threshold. This could easily be done with ecasound's -ge parameter. However, I started thinking and found that it would be better to have a different file for each segment. For example, if there is - 45 seconds of speech, followed by - 3 minutes of silence, followed by - 2 minutes of speech I would get two files, one 45 seconds long and one 2 minutes long. Does such a program allready exists, and if not, what would be the best/easiest way of doing it? 1: http://www.davee.com/scanrec/ Thanks a lot, GFK's -- Guillaume Filion, ing. jr Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/ PGP Key and more: http://guillaume.filion.org/

19 years, 3 months

[linux-audio-dev] Alsa Sequencer Raw MIDI Data

by Dirk Jagdmann

Hello Developers, I'm currently developing an application which should be controlled via MIDI. I'd like to use the Alsa Sequencer API, so I can use aconnect and friends to connect my app to other apps and MIDI hardware. However I like to get access and send the raw MIDI stream. So far I only saw code which use the snd_seq_event_input() call which already parsed the MIDI data. Is there another function which lets me access the latest received MIDI bytes? Or does the snd_seq_event_t struct contain the raw bytes? -- ---> doj / cubic ----> http://cubic.org/~doj -----> http://llg.cubic.org

19 years, 3 months

[linux-audio-dev] USB: Is a CLASS_INTERFACE request a kind of control transfer ?

by Jan Holst Jensen

Dear wise members of the list. I am (still) trying to implement a control panel feature for the U2A USB sound card. I (finally!) have the alsa patch from Clemens Ladisch up and running - at least I can compile a small program that when run squirts of a small control transfer URB to the sound card without complaints. Now, half of the URBs sent to the device are CONTROL_TRANSFER blocks, but the other half are marked as CLASS_INTERFACE in the SnoopyPro logs. See a typical example below. I have googled the net and searched the USB specs without getting much wiser as to what a CLASS_INTERFACE request is and does. Can I send it using CONTROL_TRANSFER URBs or is yet another extension of the alsa driver necessary ? Cheers -- Jan Holst 277 out down n/a 710.461 CLASS_INTERFACE 01 URB Header (length: 80) SequenceNumber: 277 Function: 001b (CLASS_INTERFACE) PipeHandle: 00000001 SetupPacket: 0000: 00 01 00 01 00 04 ea 87 bmRequestType: 00 DIR: Host-To-Device TYPE: Standard RECIPIENT: Device bRequest: 01 CLEAR_FEATURE TransferBuffer: 0x00000001 (1) length 0000: 01 277 out up n/a 710.471 CONTROL_TRANSFER - 0x00000000 URB Header (length: 80) SequenceNumber: 277 Function: 0008 (CONTROL_TRANSFER) PipeHandle: 860fee14 SetupPacket: 0000: 21 01 00 01 00 04 01 00 bmRequestType: 21 DIR: Host-To-Device TYPE: Class RECIPIENT: Interface bRequest: 01 No TransferBuffer __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 3 months

Re: [linux-audio-dev] Radio Scanner Recorder

by Jonathan Woithe

Hi Guillaume > I'm a in the process of making a police/EMS/fire radio recorder. ... > However, I started thinking and found that it would be better to have a > different file for each segment. For example, if there is > - 45 seconds of speech, followed by > - 3 minutes of silence, followed by > - 2 minutes of speech > I would get two files, one 45 seconds long and one 2 minutes long. > > Does such a program allready exists, and if not, what would be the > best/easiest way of doing it? Although it uses the OSS API, you might like to take a look at batchrec-1.2.0, available in source-form only on my website at http://www.physics.adelaide.edu.au/~jwoithe There's no autoconf support, but it shouldn't be difficult to get going on any modern Linux distro, and is reasonably well documented via the "-h" command line parameter. It's tested and developed under Slackware. >From the sound of your description, batchrec will probably do what you want. The code is a little "quick and dirty" and probably needs tidying up, but it does the job. It's textmode only at this point mainly because I can't be bothered writing a GUI for it at the moment. You also get levelmeters to monitor the level coming in. It's OSS-only because for me it works, does what I need and I've been short of time in recent months. I have been toying with the idea of writing a native ALSA and/or jack backend to it, but that is probably a way off yet. Anyway, have a look and see if it does what you need. Perhaps contact me off-list if you have specific followup questions. Regards jonathan

19 years, 3 months

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Linux-audio-dev August 2005