Linux-audio-dev

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3 participants
7535 discussions

by Dave Phillips

Greetings, A fellow Fender Mustang 1 user is working on native Linux software that can be used with the amplifier. Apparently he needs some tools like usbsnoop to find out what's happening to & from the amp's USB port. He wrote that usbsnoop and snoopyusb weren't able to do the job, so I thought I'd ask if there are other similar tools that might be more up-to-date. Suggestions ? Best, dp

15 years, 1 month

[LAD] Time-Stretch

by Harry Van Haaren

Hey all, I'm looking for an open-source time-stretching library, suitable for RT work. I've googled and come up with the following list, which I can't choose from: -Soundtouch : http://www.surina.net/soundtouch/index.html -ClearScale / DspDimension: http://www.clearscale.org/ -SecretRabbitCode / libsamplerate : http://www.mega-nerd.com/SRC/ -LibResample : https://ccrma.stanford.edu/~jos/resample/ -MFFM timescale: http://mffmtimescale.sourceforge.net/ -LibZita-Resampler: http://www.kokkinizita.net/linuxaudio/zita-resampler/resampler.html I'm attepmting to write a sample player, that will time-stretch long loops to stay in sync with JACK transport. I've deduced this is what I need to do: - Calculate the amount of samples I need to change the buffer length by - Take the buffer, resample it to a larger / smaller amount of samples. - Playback the samples as I normally would, except that there's more, and hence the audio will stay in sync. Design choices: 1. should I re-sample the whole buffer, and then playback from that buffer? this approach might cause a lot of CPU strain once the rate changes, as the *whole* buffer would be re-sampled at the same time. Once done, the CPU has no strain from resampling. 2. Resample "nframes" amount of samples from the buffer, and play them back? Less sudden CPU overhead, more constant CPU usage. The other problem I'm faced with is that some libraries mention that they do *not* support "dynamically variable resampling ratios". Would I need this? I think I do, as to get the beat "on-time" sometimes I'd need to add 200 samples, while in other cases 210 samples might suit better... I'm aware that Ardour uses SoundTouch, but I'm not sure is that the best lib for real-time use. Mixxx is using LibSamplerate AFAIK, and does so quite well, but might not be as suitable as Soundtouch.. http://www.surina.net/soundtouch/faq.html#sample_processing These kind of paragraphs are what stop me from just choosing one and going with it... Choices, Advice, Laughter, Help, etc all welcome! :-) Cheers, -Harry

15 years, 1 month

[LAD] On the last eve of the year

by Jens M Andreasen

It was so terribly cold. Snow was falling, and it was almost dark. Evening came on, the last evening of the year. In the cold and gloom a poor little girl, bareheaded and barefoot, was walking through the streets. Of course when she had left her house she'd had slippers on, but what good had they been? ... The Little Match Girl http://mx44.linux.dk/~jens/unpublished/mtchgirl.mp3 ... "She wanted to warm herself," the people said. No one imagined what beautiful things she had seen, and how happily she had gone with her old grandmother into the bright New Year.

15 years, 1 month

[LAD] PD L2Ork 20101229 snapshot now available

by Ivica Ico Bukvic

Please excuse cross-posting. Dear friends and fellow FOSS enthusiasts, It is my great pleasure to share with the community a belated Holiday present :-) in a form of latest snapshot of L2Ork iteration of Pure-Data. Better than ever, the latest version comes with the following improvements: *implemented apply undo for array properties and partially implemented apply undo for graph-on-parent object properties (does not apply to abstractions or top-level windows currently until I figure out how to address the indexing of toplevel windows inside the glist as well as how to address to which window such an undo belongs). *properties are disabled when right-clicking on an abstraction as modifying its settings externally does not make sense when one does not see the actual contents inside it. So, to edit the properties of an abstraction, one has to open the actual abstraction. *fixed how new arrays are created so that they always fit within the specified boundaries. Please note arrays that have been already created in prior patches remain untouched in terms of graph auto-resizing (legacy code is provided in g_editor.c canvas_vis that deals with this if anyone wishes to convert their arrays but is incomplete in that it assumes all arrays require resizing--this is however unnecessary as simple recreation of said arrays or manual readjustment of their settings ought to do the trick. -This feature needs further testing--feedback is most appreciated. *fixed how arrays deal with moving array points via mouse by restricting them within the array bounds--this should work for all gui-driven array operations, while array alterations via snapshots and other external ways of manipulating arrays remain unbound so as to allow for traditional data-flow debugging--this may change down the road in part due to introduction of the magicGlass option and in part due to belief that data monitoring should only report ranges specified by the graph. -This feature needs further testing--feedback is most appreciated. *added new feature for arrays where they report a bang through the <arrayname>_changed send (if one is provided) whenever they have been altered by a mouse click'n'drag--this in conjunction with array graph auto-resizing makes arrays formidable alternatives for multisliders. -This feature needs further testing--feedback is most appreciated. *when an array subpatch is opened and resized, the array automatically now resizes to properly fill the window. -This feature needs further testing--feedback is most appreciated. *fixed where array was not visible after reopening the patch if any of its points touched upon y graph limits. *fixed couple of segfaults caused by gridflow incompatibility--more problems remain with gridflow library compatibility, likely due to widgetbehavior and possibly also magicGlass incompatibility. Further investigation is necessary. *fixed memory leak in the disis_phasor~ external where the destructor was never properly called and updated its documentation (available in the l2ork_addons package). *fixed highlighting of signal nlets where nlet would revert to non-signal appearance after being highlighted/connected. *reintroduced array listview (this was a regression in respect to pd-extended). *improved appearance of the array listview. *fixed a few broken links in the pddp documentation and added new l2ork-specific array features to the pddp documentation. Latest snapshot is available from the usual place: http://l2ork.music.vt.edu/main/?page_id=56 Complete changelog since 11/25/2010 is available here: http://l2ork.music.vt.edu/data/pd/Changelog Happy belated Holidays! Best wishes, Ico

15 years, 1 month

[LAD] Fwd: Devs needed for opensource virtual analog softsynth idea

by Sascha Schneider

I love attractive UIs like those from Bristol, have to try those ... I want to use them in f.e. Qtractor or Rosegarden as softsynths with some live character with external midi-controllers or with automation. regards, saschas 2011/1/2 Ricardo Wurmus <ricardo.wurmus(a)gmail.com>: > Hi Sascha, > > I found the AlsaModularSynth to be a great sounding "analog-ish" modular > synthesizer with a very direct and very usable interface. > > I don't quite understand your vision just yet. Is the idea basically to > write an attractive and usable GUI for an existing synth (engine)? > > > > On 2 January 2011 21:47, Julien Claassen <julien(a)c-lab.de> wrote: >> >> Hello Sascha! >> I'm not good at coding at all, but I think a more useable framework for a >> softsynth, if you like to build it with an existing one, might be bristol. >> Bristol is a synth emulator. It has a couple of synths already. But it might >> not suffer, having a new filter or different oscillator in it, if Nick is OK >> with that. The synths it emulates, are basically built from the components >> (filters, oscs, etc.), that are in the engine. Then they are connected in a >> particular way and get a GUI/CLI put on top of them. Bristol has, what I >> would call MIDI learning. You can easily assing MIDI controls to controls of >> the currently loaded synth and I think you can save them as well. Have a >> look at his site: >> http://bristol.sf.net >> The sweet thing about using this would be, that you have to implement the >> new components and then there is an API - so I believe - for relatively >> easily constructing the connections and the <UIs. I know only of the textUI, >> which is very clever and helpful! >> Kindly yours >> julien >> >> -------- >> Music was my first love and it will be my last (John Miles) >> >> ======== FIND MY WEB-PROJECT AT: ======== >> http://ltsb.sourceforge.net >> the Linux TextBased Studio guide >> ======= AND MY PERSONAL PAGES AT: ======= >> http://www.juliencoder.de >> _______________________________________________ >> Linux-audio-dev mailing list >> Linux-audio-dev(a)lists.linuxaudio.org >> http://lists.linuxaudio.org/listinfo/linux-audio-dev > >

15 years, 1 month

[LAD] [ANN] MusE 2.0alpha

by Robert Jonsson

Hello everybody, We have a present for you, a new release of MusE. The alpha indicates this is an early version so it's mainly - a teaser to spread the word. - an early adopters build. - to welcome developers who want to port MusE to other platforms. MusE has now been completely ported to the Qt4 architecture and we (mainly Tim and Orcan) are busy to make it even better than before, lots of gui stuff being reworked. MusE now also sports a new version of the DeicsOnze, DX11 emulating softsynth, up from version 0.2 to 1.0. The homepage has received a new look that we hope will give a better indication of what MusE is and does. Do visit http://muse-sequencer.org. The full changelog is available at: http://lmuse.svn.sourceforge.net/viewvc/lmuse/trunk/muse2/ChangeLog?revisio… Find the download at: https://sourceforge.net/projects/lmuse/files/ Happy Holidays! The MusE Team

15 years, 1 month

[LAD] LV2 Beat reporting?

by Jeremy

Hi all, So I'm writing some LV2 plugins to wrap up the Aubio audio analysis library<http://aubio.org/>, and I'm not sure exactly how to handle functions like "onset" detection. Currently, it just outputs clicks to an audio port (0 when no beat, 1 when beat is detected). However, this doesn't take advantage of the power of LV2. It is unclear to hosts and other plugins exactly what sort of data is coming out. I was thinking that maybe it would output MIDI, as midi matches the "event based" aspect of beat detection. Perhaps sending out MIDI beat clock signals <http://en.wikipedia.org/wiki/MIDI_beat_clock>? However, that doesn't really match the sort of data that the Aubio functions detect. Maybe it could just send a midi note on event? It seems like maybe some sort of LV2 specific extension might be in order? The Event Port <http://lv2plug.in/ns/ext/event/#EventPort> extension seems to define everything I need: sending timestamped events with no extra information attached. The question is: does it require some sort of further extension to define what a beat port is in the way the MidiEvent extension does? Of course, this raises the question: Is a port specific for "beats" even necessary? I can think of a few cases: - DAW uses beat signals to set up markers on a track - DAW uses beat signals to break a percussive track up into beats. - Delay effect uses beat signals to have a timed delay - Automatic drummer adds on a percussion part to audio with varying tempo - ? other beat-synchronous effects? Anyway, I'm wondering what you all think would be the best option, or whether you think functionality like this is even warranted in an LV2 plugin (should analysis plugins stick to VAMP?). So let me know what you think. Jeremy Salwen

15 years, 1 month

[LAD] [ANN] tschack-0.120.1 and PyJackd-0.1.0

by torbenh

hi... since jack1 release is taking pretty long, i decided to stop waiting with a tschack release. tschack is an SMP aware fork of jack1. its a dropin replacement like jack2. features: - jack1 mlocking - controlapi which works even when libjackserver.so is loaded RTLD_LOCAL - smp aware - backendswitching - strictly synchronous like jack1. (-> no latency penalty) - clickless connections. - shuts down audio processing when cpu is overloaded for too long. i also released PyJackd which is a wrapper around libjackserver. features: - commandline for backendswitching - pulseaudio dbus reservation. get it here: http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz -- torben Hohn

15 years, 1 month

[LAD] on the soft synth midi jitters

by cal

Does anyone have any experience with speed of traversal through a boost multi index container? I'm pondering their use to manage notes currently in play, eg indexed by midi channel ordered by midi event time/frame stamp. cheers, Cal

15 years, 1 month

[LAD] Program design: C++ -> SHM -> Python

by Harry Van Haaren

Hi, I've been trying to come up with a nice program architecture for a live performance tool (Audio looping etc), and I've kind of hit a wall: Input will be taken via OSC, the "engine" will be written in C++, and the GUI is up in the air. I've written most of the engine, (working to a degree needs some bugfixes), and now I've started implementing the GUI in the same binary. Ie: its all compiled together, double-click it and it shows on screen & loads JACK client. The GUI code has a nasty habit of segfaulting.. which is also killing the engine. That's a no-go for live performance. The engine is rock solid stable. So its the fact that there's the GUI thread running around that's segfault-ing things. So I'm wondering if it feasible to keep the audio/other data in SHared Memory, and then write the GUI in Python reading from the same memory? Is this concidered "ugly" design? I have no experience with SHM, so I thought I'd ask. The other option I was concidering is writing the front-end GUI part using only info obtained from OSC, but that would exclude the waveforms of the audio, and lots of other nice features... Help, advice, laughter etc welcomed :-) -Harry

15 years, 1 month

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Linux-audio-dev