Linux-audio-dev December 2002

linux-audio-dev@lists.linuxaudio.org

75 participants
96 discussions

by ljp

hello, I am writing a audio recording app for linux pdas, of the zaurus sort. I am running into a problem with switching sampling rates on the target device, and need some help to find a work around for a buggy driver, which I have no control over, as it's shipped with the device, and is not a kernel module. When testing on my x86 desktop, and various audio cards, everything works as planned. But when running on the device (arm based processor, tc35143 audio chip - heh for whatever its worth), when I request a new sampling rate, the driver/device seems to change, no errors are reported. I can ask the driver what the rate is and it reports what I requested, but the actual amount of data received is at the previous rate. I can close the app and get the actual intended rate. I have tried doing a fork, in hopes maybe the driver was holding process information. No joy. I don't want to have to resample the input, as it seems a waste of cpu, and as a musician... blasphamy. Any hints, or suggestions would be welcomed. thanks, ljp -- My cat's a debugger.... Potter, Lorn, "ljp" core member / Web Administrator Project OPIE- the Open Palmtop Integrated Environment http://opie.handhelds.org | http://www.opie.info (german) | http://www.opie.us IRC: irc.freenode.net #opie #opie.de llornkcor(a)handhelds.org

23 years

[linux-audio-dev] Re: Intel C Compiler & RedHat 8.0 , Pentium 4 FPU performance

by Andrew Burgess

>I will check the effect of sse on my plugins as they are generally less >ram hungry, but I dont have a gcc3 machine around at the moment. Just FYI, the redhat gcc3 rpm installs the executable as gcc3 so it happily coexists with older gcc versions. You just edit the makefile to use gcc or gcc3.

23 years

[linux-audio-dev] ANN: swh-plugins v0.3.1

by Steve Harris

http://plugin.org.uk/releases/0.3.1/ Includes a fix for a serious problem where two plugins ended up with the same UID, 0.3.0 users should upgrade. One new plugin, "chebstortion" a synthetic distortion effect that came out of the amp modelling discussions. It doesn't really bear any resemblance to any analogue effect living or dead, but its interesting anyway. Bugfix to the analogue osc, it now doesn't (shouldn't) distort horribly. Bugfix to the chorus, it now uses less CPU and its load is constant, so it will work OK in RT systems. Now builds on Linux PPC (though still not OSX). Installs RDF metadata describing the plugins. Now has freshmeat entry, http://freshmeat.net/projects/swh-plugins/ (someone requested this, sorry, can't remeber who). - Steve

23 years

[linux-audio-dev] finding info on sound cards

by iain

For a couple of projects I need to be able to find out information about the sound cards installed on the system, but as I need to run on lots of different systems I need it to be fairly portable. Before I start writing something to do it, I figured I'd check to see if there's anything already in progress that can do the same. What I need is to be able to get a list of sound cards on the system, and information about them (like the names), and then to get a list of the channels each sound card has and information on them (current level, name (if it has one), if it's a record source etc), and finally to be able to control the channels, change the level, change if it's the current record source. Is there a library that can do this all available anywhere, or will I have to write it myself? Would it be a useful thing to have in a library? iain -- "The 'developed' nations gave to the 'free market' the status of a god, sacrificing to it their farmers, farmlands, and communities, their forests, wetlands and praries, their ecosystems and watersheds. They had accepted universal pollution and global warming as normal costs of doing buisness." - Wendell Berry

23 years

[linux-audio-dev] ANN: RTMix 0.52 version available

by Ivica Bukvic

Hello all! A new version of RTMix is available at the same old place: http://meowing.ccm.uc.edu/~ico/ (use html entrance for low-bandwith version -> cpu's -> rtmix download) New improvements include: *Fixed networking seg-faults in Qt3 *Finished network code *Removed all kde-libs dependencies (I overlooked a couple in the configure script itself, sorry about this) *Several minor bug-fixes *Fixed all other known seg-faulting bugs *Added a couple of networking tutorials Enjoy! Ivica Ico Bukvic, composer, multimedia sculptor, programmer, webmaster & computer consultant http://meowing.ccm.uc.edu/~ico/ ============================ "To be or not to be" - Shakespeare "To be is to do" - Socrates "To do is to be" - Sartre "Do be do be do" - Sinatra "2b || ! 2b" - ? "I am" - God

23 years

[linux-audio-dev] Announce : Secret Rabbit Code (aka libsamplerate)

by Erik de Castro Lopo

Hi People, This is the first announcement of Secret Rabbit Code: http://www.mega-nerd.com/SRC/ Secret Rabbit Code is a library for doing Sample Rate Conversion on audio. The web page has the full spiel of what it does. The source code tarball has two demo programs: sndfile-resample - A program which can perfrom sample rate conversion on a given sound file. varispeed-play - A program which plays a given sound file in a loop. During play, the speed of the playback is continuously varied. Lots of fun on drum loops and full mixes. This currently runs only on Linux/OSS (probably also ALSA OSS emulation). Work is being done on ports to MacOSX, Solaris and Win32. At the moment the rabbit code is known to compile on Linux and MacOSX. Win32 and Solaris support is coming RealSoonNow (tm). Enjoy, Erik -- +-----------------------------------------------------------+ Erik de Castro Lopo nospam(a)mega-nerd.com (Yes it's valid) +-----------------------------------------------------------+ Everyone seems to assume that the current system in America is capitalism. I beg to differ. True capitalism does not involve false advertising, distribution cartels, or political lobbying for special advantages in the market. How can you call Microsoft or the RIAA capitalist, when their main business is interfering with a free market? Some of us would like to see a *return* to capitalism in this country. - Jim Flynn on Linuxtoday.com

23 years

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Linux-audio-dev December 2002