Linux-audio-dev

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7501 discussions

[linux-audio-dev] BruteFIR + jack = crackling noise?

by Werner Johansson

Hi all! First post to this list for me.. I have observed a strange thing with my jackd + BruteFIR setup, it looks something like this: HW: Emagic 2|6 USB thing (hw0), directly connected to a USB port, no hubs.. This runs with both inputs and outputs in analog mode for now to rule out any kind of sample rate/clock rate mismatches digital mode can introduce. Kernel 2.4.19-1LL (running Planet CCRMA software here with lowlatency enabled in the kernel) - have tried this on both a RedHat 7.3 and RedHat 8.0 system. jackd -R -d alsa -d hw:0 -r 44100 -p 2048 BruteFIR running at 44100Hz with a filter size of 2048,8 This gives me a faint crackling noise in the output (sounds like latency issues, but nothing gets logged anywhere).. The symptom is the same for 48kHz, and to make sure that's it not really anything directly hardware related I can start jack up and instead of connecting BruteFIR I can connect AlsaPlayer and play MP3's or whatever just fine (!)... That's not the most interesting part though - the crackling disappears if I choose a filter size of 4096,4 (or 8) instead, with the same period size for jack - that really shouldn't make any difference, should it?? Anyone else that have seen/heard this problem, or is it just me? :) It seems that my 2|6 likes period sizes of 44100/1000 or 48000/1000 much better than the BruteFIR-enforced 2^something sizes though - I can't reliably play anything using a period size of 1024, but one of 820 is fine @ 44100Hz rate (?) What other information would be relevant here? /WernerJ

22 years, 4 months

[linux-audio-dev] Fwd: CSL Motivation

by Roger Larsson

Hi, There are discussions on kde-multimedia about the future of Linux/Unix multimedia (especially sound). This is one of the most interesting messages. /RogerL ---------- Forwarded Message ---------- Subject: CSL Motivation Date: Tuesday 25 February 2003 16:26 From: Tim Janik <timj(a)gtk.org> To: KDE Multimedia <kde-multimedia(a)mail.kde.org> hey all, due to the recent discussions involving CSL (amongst other projects) on this list, i've put up a preliminary web presence at: http://sfk.evilplan.org/csl/ and, more importantly, stefan and i wrote a paper going into the details of why we think a project like CSL is necessary and what we intend to achieve with it: http://sfk.evilplan.org/csl/csl-paper.ps --- ciaoTJ _______________________________________________ kde-multimedia mailing list kde-multimedia(a)mail.kde.org http://mail.kde.org/mailman/listinfo/kde-multimedia ------------------------------------------------------- -- Roger Larsson Skellefteå Sweden

22 years, 4 months

Re: Re: [linux-audio-dev] BruteFIR + jack = crackling noise?

by Taybin Rutkin

>> BTW, can JACK handle several HW interface using different blocksizes >> at a time (assuming sample frequencies are coherent) ? >No, but you could run several instances of JACK. Acutally, I'm afraid that you can't do that currently. Taybin

22 years, 4 months

[linux-audio-dev] LADSPA valgrind test wrapper

by Steve Harris

I hacked up a shell script [attached] to valgrind LADSPA .so files. It will report leaks, bufferoverruns, reads from unitialised variables and so on, but it doesn't totally exercise the plugin so it may miss some things. Obviously it helps if you rebuild with -g on and it works best with gcc3 (better inline debugging). You can't just "valgrind applyplugin ..." becuase valgrind doesn't chase the dlloaded objects and applyplugin is full of memory errors and leaks :) Usage: ladspa-valgrind <plugin.so>+ I dont recommend running it on my current plugin set ;) Requires gcc and valgrind 1.0+ - Steve

22 years, 4 months

[linux-audio-dev] problems with Midisport 2x2

by Ivica Bukvic

Hi all, I've got a small problem with my Midisport 2x2 MIDI interface. While it worked ok before, now for some odd reason I cannot get it to open for MIDI output (from the computer). I've checked the /var/log/messages and this is what I got: Feb 24 20:44:41 mycomp kernel: hub.c: USB new device connect on bus2/1, assigned device number 2 Feb 24 20:44:41 mycomp kernel: usb.c: USB device 2 (vend/prod 0x763/0x1001) is not claimed by any active driver. Feb 24 20:44:44 mycomp /etc/hotplug/usb.agent: Setup ezusbmidi for USB product 763/1001/1 Feb 24 20:44:44 mycomp /etc/hotplug/usb.agent: Module setup ezusbmidi for USB product 763/1001/1 Feb 24 20:44:44 mycomp /etc/hotplug/usb/ezusbmidi: load /usr/share/usb/ezusbmidi/ezusbmidi2x2.ihx for 763/1001/1 to /proc/bus/usb/002/002 Feb 24 20:44:44 mycomp kernel: usb-uhci.c: interrupt, status 2, frame# 1645 Feb 24 20:44:44 mycomp kernel: usb.c: USB disconnect on device 2 Feb 24 20:44:44 mycomp kernel: hub.c: USB new device connect on bus2/1, assigned device number 3 Feb 24 20:44:44 mycomp kernel: usb.c: USB device 3 (vend/prod 0x763/0x1110) is not claimed by any active driver. Feb 24 20:44:48 mycomp /etc/hotplug/usb.agent: Setup snd-usb-audio audio usb usb-midi for USB product 763/1110/1 Feb 24 20:44:48 mycomp kernel: usb.c: registered new driver snd-usb-audio Feb 24 20:44:48 mycomp kernel: snd-usb-midi: MIDIStreaming version 01.00 Feb 24 20:44:48 mycomp kernel: snd-usb-midi: EP 01: 2 jack(s) Feb 24 20:44:48 mycomp kernel: snd-usb-midi: EP 81: 2 jack(s) Feb 24 20:44:48 mycomp kernel: snd-usb-midi: created 0 output and 4 input ports Feb 24 20:44:48 mycomp kernel: usb-uhci.c: ENXIO c0008380, flags 0, urb cdc59d60, burb cdc59ce0 Feb 24 20:44:48 mycomp kernel: snd-usb-midi: usb_submit_urb: -6 Feb 24 20:44:48 mycomp /etc/hotplug/usb.agent: ... blacklisted module: audio Feb 24 20:44:48 mycomp kernel: usb.c: registered new driver midi Feb 24 20:44:48 mycomp /etc/hotplug/usb.agent: ... blacklisted module: usb-midi It says that the device was opened with 4 input and 0 output ports. Why is this the case? I have no problem getting the midi input going, but my output is mysteriously dead. I've read somewhere that if the device is reconnected that the output stops working (might have been CCRMA's Fernando), but this is the log from the initial connect as soon as the computer boots. I've also made sure that no MIDI devices were connected to the MIDISPORT upon starting up. Any help on this issue is greatly appreciated! Sincerely, Ico

22 years, 4 months

Re: [linux-audio-dev] BruteFIR + jack = crackling noise?

by John Lazzaro

> we don't care about non-power-of-two periods, i think. however, i do > consider periods defined in units of times and not frames to be broken > hardware design. it forces inefficiencies into the software that are > totally unnecessary. For what its worth, the SAOL standard has to deal with this problem too, since the user gets to specify an integer k-rate and an integer a-rate. Eric went for this solution: 5.8.5.2.2 krate parameter <global parameter> -> krate <int>; The krate global parameter specifies the control rate of the orchestra. [...] The krate parameter shall be an integer value between 1 and the sampling rate inclusive, specifying the control rate in Hz. [...] If the control rate as determined by the previous paragraph is not an even divisor of the sampling rate, then the control rate is the next larger integer that does evenly divide the sampling rate. The control period of the orchestra is the number of samples, or amount of time represented by these samples, in one control cycle. --- This has been controversial, since it limits the ability to use SAOL to emulate existing coding standards that have non-integer relationships betweens frames and the sample rate. The win has been decoder implementation simplicity. ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

22 years, 4 months

[linux-audio-dev] [ANNOUNCE] tapiir-0.7.0

by Maarten de Boer

Hello, I just released a new version of tapiir. Tapiir now supports jack. Tapiir can be found at http://www.iua/~mdeboer/projects/tapiir/ Tapiir is a simple and flexible audio effects processor, inspired on the classical magnetic tape delay systems used since the early days of electro-acoustic music composition. It provides a graphical user interface consisting of six delay lines, or "taps", which can introduce an almost arbitrarily big or small delay to their inputs and can be feed back to each other. A wide set of effects can be easily achieved by properly configuring and connecting the delay lines: complex echo patterns, resonances, filtering, etc. Delays, interconnections and gains can all be controlled in real time. Maarten

22 years, 4 months

[linux-audio-dev] BruteFIR + jack = crackling noise?

by Werner Johansson

reposting to the list, my email client had some hick-ups.. Paul Davis <paul(a)linuxaudiosystems.com> wrote: > if you mean at JACK's level, then it prints out information about > xruns. i think you mean something else, but i'm not sure what. OK, but jackd is accessing a DMA buffer - where would that be located for USB devices which doesn't do any real DMA? (OK, maybe that's something for ALSA to figure out) The debugging I was thinking about would be something more fine-grained than just xruns (as I'm not getting any xruns (well, if I choose a period size of 64 I'm getting lots of them). I'm not really sure what to monitor either, just thinking out loud here - it might be interesting to find out where the actual playback and recording pointers are pointing when accessing the buffer to find out whether something is out of sync (it kind of sounds like that, that the beginning of the buffer gets overwritten with new data, or that the end of the buffer somehow isn't completely written when jackd grabs it). Not sure whether jackd can actually see that though (?). The two parts of the buffer (when using two periods) is laid out consecutively in memory, right? One possible explanation might be that jackd gets called a bit to early/late when the audio device/driver is switching buffers, but that would be kind of hard to actually see for jackd as a client to ALSA? (I recognize the audio artifacts from the good old days of DOS demo coding of SoundBlaster DMA, at one point where I had screwed up the logic, writing in the "live" buffer, then the beginning of every period was anything but clean...) This isn't CPU related, there's plenty of CPU time left, and it's occuring all the time, just curious where to start debugging (it seems like it's a jackd problem because aplay works fine, but then again, I guess that aplay doesn't mmap the buffer).. /WernerJ

22 years, 4 months

[linux-audio-dev] ANNOUNCE SonaSound

by Niklas Werner

Hi LADers! I released a realtime Music-visualization-program (my master's thesis) on http://sonasound.sf.net. It's probably more of academic use at the moment. Licensed under GPL. Maybe there is some interest. Features are: - Waveform-Display - short-time-spectrum - sonogram - spectrum-generation switchable between lpc and fft - Major kinds of windowing functions choosable - Different kinds of windowing functions are directly comparable via live-switching - Overlap of 50% can be switched on and off without stopping - Buffer-Size and FFT-Size freely adjustable - All Displays work from soundfile while playing or direct live-input from soundcard - Comparison of different spectrum-generation-methods via multiple instances fo SonaSound possible Libraries needed: - fftw (www.fftw.org) - glib >= 1.2 - gtk >= 1.2 - gtkglarea - GL - GLU - portaudio (www.portaudio.com) (Yes, I know, switching to JACK might help) - sndfile >= 1.0 There are many features I would like to add and a few not-so-good-features I'd like to clean up. Have fun* Niklas

22 years, 4 months

[linux-audio-dev] ZynAddSubFX 1.0.9 relased

by Nasca Paul

Hi. I relased ZynAddSubFX 1.0.9 (a very poerfull software synthesizer for Linux). News: - added keylimit to Part - you can use multiple filter stges in order to make very steep filter rolloffs (eg. 48 dB/octave) - ADsynth - added noise mode and you can make fixed frequencies; added the "Punch" parameter - added an external program "Controller" which enables you to use the mouse for MIDI controllers - other improvements and bugfixes See more at http://zynaddsubfx.sourceforge.net Paul. __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/

22 years, 4 months

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Linux-audio-dev