Linux-audio-dev

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7520 discussions

Re: [LAD] Optimized device driver to Fast Track Pro (start developing)

by Guillaume Pellerin

On 23/11/2012 20:01, rodrigo(a)angoera.com.br wrote: > > Hi !!!!! > > The Fast Track Pro is USB 1.0, the max bandwidth is 12Mb/s. The TUSB3200 has > the isochronous USB transfer mode, that can occupy about 90% of the USB > bandwidth... Using 4 channel (2 IN and 2 OUT) with right and left, and 24 bits > (3 bytes each, in total 4(channel) * 2(left,right) * 3(data) = 24 bytes ) The > max bandwidth that could communicate is about 12Mbits/s = 1.5 Mbytes/s | 1.5 > Mbytes/s * 0.9 = 1.2 MBytes/s --> 1.2MBytes/s / 24 bytes = 50Khz ... So the > maximum USB 1.0 with 24 bits is 4 chanel in 48KHz... > You're absolutely right, the 24 bits 4 channels mode would be only accessible in 48 kHz samplerate. > I would like to know how it works the interface between USB AUDIO CLASS device > driver and the USB-AUDIO Alsa Device driver. And how does the isochronous > comunication works inside the kernel? Because I am using an RT Kernel and I > would like to set with the high priority this communication. > I don't really know how does the isochronous, but applying usual RT security audio rules seems sufficient to get high priority access and then very low latency (got 3 ms here with few audio realtime processes..). Further info here: http://joegiampaoli.blogspot.fr/2011/06/m-audio-fast-track-pro-for-debian-l… G

13 years

eigenlabs + linux

by Alexandre Prokoudine

Hi, Is anybody interested to help Eigenlabs figure out the USB layer to get their stuff ported to Linux? http://www.eigenlabs.com/forum/threads/id/1148/ They are very free software friendly. Their code is available under GPL, they have a very good understanding of working with community while staying an enterprise (the instruments are not open, as far as I can tell), and, needless to say, the instruments they do are beyond awesome. Alexandre Prokoudine http://libregraphicsworld.org

13 years, 1 month

Re: [LAD] VSTGUI porting in Linux

by Louis Gorenfeld

>> Hello Louis, >> >> You might want to contact Filipe Coelho (aka falktx). >> >> http://forum.linuxmusicians.**com/viewtopic.php?f=47&t=10231<http://forum.linuxmusicians.com/viewtopic.php?f=47&t=10231> >> >> Regards, >> >> Jeremy >> > >I have some experimental code for VST UIs in Linux (using openGL), it's not >ready for release... >I've uploaded a source tarball with a plugin inside, although the UI seems >to have some little issues right now: >http://kxstudio.sourceforge.net/tmp/3BandEQ-VstTest1.tar.gz > >I'll work more on it soon, so for now it can be a "preview" of how it is >done. >But in short, it uses something I call "DISTRHO Plugin Toolkit", which >similar to Juce can make a single source code compile into different plugin >APIs (At the moment LADSPA, DSSI, LV2, VST and Standalone, some better than >others). >This plugin uses openGL for the UI, but Qt4 can be used alternatively. DISTRHO looks interesting, but I was wondering maybe if my existing VSTGUI code could somehow be used with the least amount of adjustments. I guess since it's just a bunch of x,y offsets and basic widgets it shouldn't be too hard to port to another toolkit, but I don't have the free time I used to. But, I'll definitely consider it. It's free, right? I didn't see a license so I'm guessing it'd be ok to bake into my binary-only application (apologies if I just missed it). I'm wondering if maybe downgrading VSTGUI and making the plugin perfectly WINE-friendly (or winelib) would be an option. Anyone know what the best VSTGUI version might be the best target for that? And any opinions on the VSTGUI port found at jacklab.net? -Louis

13 years, 1 month

Optimized device driver to Fast Track Pro (start developing)

by rodrigo＠angoera.com.br

Hi every body, I would like to develop an very optimized device driver for the USB soundcard, I am going to use the IC TUSB3200 similar the Fast Track Pro from M-Audio (I would like to optimize this device driver as well) , I am a hardware developer, and now I gonna start in the Linux world... I would like to know if someone could tell me what the better path to learn and develop an USB sound card???

13 years, 1 month

[ANN] Vee One Suite 0.2.0 - The second public release

by Rui Nuno Capela

Greetings, The new gang-of-three's now barely consolidated into one semi-official 'Vee One Suite'. Of course, as time goes by, inexorably, the still self-described 'old-school', 'proto-toys', just become a little older and mature by the day. Eventually, they will rot. But not today. Same old features, still the norm: * a pure stand-alone JACK client with JACK-session and both JACK MIDI and ALSA MIDI input support; * a LV2 instrument plugin. Here follows the news from the change-log, common to all synthv1, samplv1 and drumkv1, unless specifically stated otherwise: - New Reset (all values to preset default) button. - New parameter A / B comparison toggle buttons. - New element exclusive Group sounding setting. (drumkv1) - New Velocity sensitivity configuration control. - Increased baseline polyphony from 24 to 32 voices. - Mouse-wheel support on combo-dial knob widgets. - New command line options: --help and --version information. (stand-alone JACK client forms only) - Voice re-triggering fast-release fix. - LV2 event buffer recycle fix. - Prepared for relative filesystem paths on preset file references. - Audio sample file browser support for old 8.3 file-name formats. (samplv1, drumkv1) - Audio sample waveform widget context menu added. (samplv1) And here are the (old-school) buddies: * synthv1 - an old-school polyphonic synthesizer synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: http://synthv1.sourceforge.net downloads: http://sourceforge.net/projects/synthv1/files - source tarball: http://download.sourceforge.net/synthv1/synthv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.i586.… http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.x86_8… * samplv1 - an old-school polyphonic sampler samplv1 is an(other) old-school all-digital polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: http://samplv1.sourceforge.net downloads: http://sourceforge.net/projects/samplv1/files - source tarball: http://download.sourceforge.net/samplv1/samplv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.i586.… http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.x86_8… * drumkv1 - an old-school drum-kit sampler. drumkv1 is (yet) an(other) s an old-school all-digital drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.i586.… http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.x86_8… see also: http:/www.rncbc.org/drupal/node/580 enjoy! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

13 years, 1 month

CAPS Tonestack tone strange behavior

by Lucas Takejame

Hi everyone, I was using CAPS AmpVTS and notice that some tone knobs didn't work well. I end up trying tonestack plugin itself and it seems that the problem (is this a bug or its the way it really works?) is there, the Bass filter apparently stops working about 0.5 to 1.0 , the Mid filter, on the other way, apparently starts working in this zone, Treble seems to work fine. Has anyone noticed something like that or even corrected this problem? Att, Lucas Takejame

13 years, 1 month

Embedded linux: Multitrack + Playback/Record

by Prasant J

Hello, I intend to develop an audio application for my embedded linux system. My objectives are multi-track playback + record. (support for file formats like wav, mp3, etc.) Can anyone suggest if there is a library with a clean API that I can use? Any suggestions are welcome. - Regards, pj

13 years, 1 month

Segfault when trying to dereference __midi_event.buffer (c++ newbie question)

by Shani Hadiyanto Pribadi

Hello there! I am trying to write a real time pitch shifter using C++. The pitch shifter uses resampling and WSOLA for time-scaling. I have written a jack client that already works using C, but I would like to try using zita-resampler as the resampler library for my program. That is why I am rewriting my program using C++ (it would also be a learning experience for me). I looked to Rui's synthv1 and zita-ajbridge for example of writing jack client using C++. The problem I am having relates to Jack MIDI. My program keeps having a segfault when it is trying to read from the MIDI buffer, specifically when it tries to dereference the buffer pointer inside the event structure. jack_midi_event_get(&in_event, midi_buf, event_index); if ((*(in_event.buffer) & 0xf0) == 0x90) // Segfault happens here, on boolean mask operation { _note = *(in_event.buffer + 1); } So I tried to print the buffer's content but it also segfaults. std::cout << std::hex << static_cast<unsigned int> (*(in_event.buffer)) << std::endl; My understanding that in_event.buffer is a pointer-to-char, so that *(in_event.buffer) should be an unsigned char. I don't understand where I am doing wrong, I would be very grateful if someone could point out my error. Oh, my computer is Archlinux 64 bit using jack2-git 20120718. I have put up a git repo of the code on https://github.com/shanipribadi/pitch-segfault.git Thanks. Shani Pribadi

13 years, 1 month

VSTGUI porting in Linux

by Louis Gorenfeld

Hi, I'm the author of a free VST called Digits that has a Linux port. Recently, I put out a new version that has a full editor GUI, but was unable to get the GUI to work on Linux because VSTGUI 4 doesn't appear to have a Linux port. What do you think the best strategy (fastest, least code changes) would be to deliver a GUI for Linux users? I see on the JUCETICE site that there's a VSTGUI 3.0 port, and the old 2.2 VSTGUI that comes with the VST SDK has at least some Linux support (IIRC). I don't use any advanced features (just dials, labels, and sliders). Are either of these good options, and which would be best? Input from somebody experienced with this would be great. -Louis

13 years, 1 month

Trouble setting h/w MIDI device as output port

by Dr Nick Bailey

I've been stumped for a while as to why my Tascam US-122 box stopped working as a writeable midi port. Using Debian Wheezy, everything was working up to a few weeks ago. MIDI input still works and there's nothing suspicious in the /var/logs. But... nick@arial:~$ aplaymidi -l Port Client name Port name 14:0 Midi Through Midi Through Port-0 20:0 TASCAM US-X2Y TASCAM US-X2Y MIDI 1 24:0 USB MIDI keyboard USB MIDI keyboard MIDI 1 nick@arial:~$ aplaymidi -p 20:0 Desktop/076903b_.mid Cannot connect to port 20:0 - Input/output error nick@arial:~$ uname -a Linux arial 3.2.0-4-686-pae #1 SMP Debian 3.2.32-1 i686 GNU/Linux Using older kernels doesn't help. Connecting e.g. rosegarden to the TASCAM US-122 in qjackctl fails silently (the link is not made in the connections window and nothing is printed on the console). Can't see any module loading issues. Is anybody else seeing this behaviour? I'd submit a bug report but really can't figure out exactly what isn't working :( nick@arial:~$ lsmod Module Size Used by snd_usb_audio 71309 0 snd_hrtimer 12540 0 snd_seq_dummy 12455 0 snd_usb_usx2y 22748 2 snd_usbmidi_lib 18844 2 snd_usb_audio,snd_usb_usx2y snd_seq_midi 12744 0 snd_seq_midi_event 13124 1 snd_seq_midi snd_rawmidi 18376 2 snd_seq_midi,snd_usbmidi_lib ... usbcore 104470 8 ehci_hcd,uhci_hcd,uas,usb_storage,snd_usb_audio,snd_usbmidi_lib,snd_usb_usx2y usb_common 12338 1 usbcore Nick/.

13 years, 1 month

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Linux-audio-dev