Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

7508 discussions

by Florian Paul Schmidt

Hi LAD, I'm working on a (very simple) EQ-matching plugin and wanted to check my understanding/approach and I also have a question. Here's what I do: 1. Analyze spectrum 1 using 50% overlapping blocks each windowed with a Hann window followed by an FFT and then using the absolute value to get the magnitude response of each block. Then finally I calculate the average of all those magnitude responses. 2. Analyze spectrum 2 using the same approach as for spectrum 1 3. Calculate the bin-wise ratio of spectrum 2 / spectrum 1 4. Calculate a linear phase filter response by using the IFFT of the aforementioned magnitude response ratio and then doing the ifftshift dance 5. Calculate a minimum phase filter response from the magnitude response ratio by taking the complex log followed by an IFFT, then folding the negative time components onto the positive ones, followed by an FFT, complex eponentiation and a final IFFT. In code: f = IFFT(exp(FFT(fold(IFFT(log(s)))))) where s is the magnitude response ratio. The code implementing this is found here: https://github.com/fps/fps-plugins.lv2/blob/master/eq_match.h The plugin using it is not done yet. So here are my questions: 1. Are there any glaring oversights with this approach? 2. What is a sensible approach to regularize this approach. If spectrum 1 has any components near zero magnitude then the division is ill suited. It works fine for my experiments with distorted guitars, but I wonder whether I should e.g. just clamp the values of spectrum 1 to something like -70 dB? 3. If the user wants to smooth the spectrum before calculating the responses what would be sensible approaches? I thought about smoothing s with a filter that has a varying bandwidth when expressed in FFT bins or Hz, but constant, when expressed in e.g. octaves or decades. I'm not sure how to do that though. Any thoughts? To finish this email, here is one example (you can play them e.g. by using mplayer on the console): 1. A guitar recording played through some distortion: https://github.com/fps/fps-plugins.lv2/blob/master/input.wav?raw=true 2. The same guitar recording played through some distortion and then a cabinet IR: https://github.com/fps/fps-plugins.lv2/blob/master/output.wav?raw=true 3. The same guitar played through the recovered filter after matching 1 to 2: https://github.com/fps/fps-plugins.lv2/blob/master/matched.wav?raw=true Kind regards, FPS -- https://fps.io

2 years, 2 months

GSequencer enters a second time the MIDI awards

by Joël Krähemann

Hi all, Please check and vote for your favorite sequencer: https://www.midi.org/component/zoo/item/advanced-gtk-sequencer-2?Itemid=1423 cheers, Joël http://gsequencer.org

2 years, 2 months

[ANN] The QStuff* Spring'23 Release batch #1

by Rui Nuno Capela

Hello! The first batch of the 'QStuff*': QjackCtl [1], Qsynth [2], Qsampler [3], QXGEdit [4], QmidiCtl [5] and QmidiNet [6], are all being released for the (northern) Spring'23 season. Enjoy while it's warm. ** QjackCtl - JACK Audio Connection Kit Qt GUI Interface [1] ** QjackCtl 0.9.11 (spring'23) released! QjackCtl is an aged yet modern, not so 'simple' anymore, Qt [7] application to control the JACK [8] sound server, for the Linux Audio [12] infrastructure. Change-log: - Graph: Soft incremental bounds constraints now imposed to all new and old nodes positioning. - Prepping into the next development cycle (with Qt >= 6.5). Website: https://qjackctl.sourceforge.io http://qjackctl.sourceforge.net Project page: https://sourceforge.net/projects/qjackctl Downloads: https://sourceforge.net/projects/qjackctl/files - source tarball: https://download.sf.net/qjackctl/qjackctl-0.9.11.tar.gz - source package: https://download.sf.net/qjackctl/qjackctl-0.9.11-55.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qjackctl/qjackctl-0.9.11-55.1.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qjackctl/qjackctl-0.9.11-55.1.x86_64.AppImage Git repos: https://git.code.sf.net/p/qjackctl/code https://github.com/rncbc/qjackctl.git https://gitlab.com/rncbc/qjackctl.git https://codeberg.com/rncbc/qjackctl.git ** Qsynth - A FluidSynth Qt GUI Interface [2] ** Qsynth 0.9.11 (spring'23) released! Qsynth is a FluidSynth [10] GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. Change-log: - Optimized audio output peak-meters. - Prepping into the next development cycle (with Qt >= 6.5). Website: https://qsynth.sourceforge.io http://qsynth.sourceforge.net Project page: https://sourceforge.net/projects/qsynth Downloads: https://sourceforge.net/projects/qsynth/files - source tarball: https://download.sf.net/qsynth/qsynth-0.9.11.tar.gz - source package: https://download.sf.net/qsynth/qsynth-0.9.11-55.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qsynth/qsynth-0.9.11-55.1.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qsynth/qsynth-0.9.11-55.1.x86_64.AppImage - Flatpak [21] package (thanks to Pedro Lopez-Cabanillas): https://flathub.org/apps/details/org.rncbc.qsynth Git repos: https://git.code.sf.net/p/qsynth/code https://github.com/rncbc/qsynth.git https://gitlab.com/rncbc/qsynth.git https://codeberg.com/rncbc/qsynth.git ** Qsampler - A LinuxSampler Qt GUI Interface [3] ** Qsampler 0.9.10 (spring'23) released! Qsampler is a LinuxSampler [11] GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. Change-log: - Bumping copyright headers to the brand new year. Website: https://qsampler.sourceforge.io http://qsampler.sourceforge.net Project page: https://sourceforge.net/projects/qsampler Downloads: https://sourceforge.net/projects/qsampler/files - source tarballs: https://download.sf.net/qsampler/qsampler-0.9.10.tar.gz https://download.sf.net/qsampler/liblscp-0.9.10.tar.gz - source packages: https://download.sf.net/qsampler/qsampler-0.9.10-54.1.rncbc.suse.src.rpm https://download.sf.net/qsampler/liblscp-0.9.10-54.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qsampler/qsampler-0.9.10-54.1.rncbc.suse.x86_64.rpm https://download.sf.net/qsampler/liblscp6-0.9.10-54.1.rncbc.suse.x86_64.rpm https://download.sf.net/qsampler/liblscp-devel-0.9.10-54.1.rncbc.suse.x86_6… - AppImage [20] package: https://download.sf.net/qsampler/qsampler-0.9.10-54.1.x86_64.AppImage Git repos: https://git.code.sf.net/p/qsampler/code https://github.com/rncbc/qsampler.git https://gitlab.com/rncbc/qsampler.git https://codeberg.com/rncbc/qsampler.git https://git.code.sf.net/p/qsampler/liblscp https://github.com/rncbc/liblscp.git https://gitlab.com/rncbc/liblscp.git https://codeberg.com/rncbc/liblscp.git ** QXGEdit - A Qt XG Editor [4] ** QXGEdit 0.9.10 (spring'23) released! QXGEdit is a live XG instrument editor, specialized on editing MIDI System Exclusive files (.syx) for the Yamaha DB50XG [14] and thus probably a baseline for many other XG devices. Change-log: - Micro-adjustments to the View > Options... dialog layout. - Prepping into the next development cycle (with Qt >= 6.5). Website: https://qxgedit.sourceforge.io http://qxgedit.sourceforge.net Project page: https://sourceforge.net/projects/qxgedit Downloads: https://sourceforge.net/projects/qxgedit/files - source tarball: https://download.sf.net/qxgedit/qxgedit-0.9.10.tar.gz - source package: https://download.sf.net/qxgedit/qxgedit-0.9.10-54.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qxgedit/qxgedit-0.9.10-54.1.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qxgedit/qxgedit-0.9.10-54.1.x86_64.AppImage Git repos: https://git.code.sf.net/p/qxgedit/code https://github.com/rncbc/qxgedit.git https://gitlab.com/rncbc/qxgedit.git https://codeberg.com/rncbc/qxgedit.git ** QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast [5] ** QmidiCtl 0.9.10 (spring'23) released! QmidiCtl [5] is a MIDI remote controller application that sends MIDI data over the network, using UDP/IP multicast. Inspired by multimidicast [15] and designed to be compatible with ipMIDI [15] for Windows. QmidiCtl [5] was long ago designed for the Maemo [17] enabled handheld devices, namely the late Nokia N900 [18] and promoted to the Maemo Package [18] repositories. Nevertheless, QmidiCtl [5] may still be found effective as a regular desktop application and recently as an Android application as well. Change-log: - Prepping into the next development cycle (with Qt >= 6.5). Website: https://qmidictl.sourceforge.io http://qmidictl.sourceforge.net Project page: https://sourceforge.net/projects/qmidictl Downloads: https://sourceforge.net/projects/qmidictl/files - source tarball: https://download.sf.net/qmidictl/qmidictl-0.9.10.tar.gz - source package: https://download.sf.net/qmidictl/qmidictl-0.9.10-54.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qmidictl/qmidictl-0.9.10-54.1.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qmidictl/qmidictl-0.9.10-54.1.x86_64.AppImage - Android packages: https://download.sf.net/qmidictl/qmidictl-0.9.10-54.1.arm64-v8a.apk https://download.sf.net/qmidictl/qmidictl-0.9.10-54.1.x86_64.apk https://play.google.com/store/apps/details?id=org.rncbc.qmidictl Git repos: https://git.code.sf.net/p/qmidictl/code https://github.com/rncbc/qmidictl.git https://gitlab.com/rncbc/qmidictl.git https://codeberg.com/rncbc/qmidictl.git ** QmidiNet - A MIDI Network Gateway via UDP/IP Multicast [6] ** QmidiNet 0.9.10 (spring'23) released! QmidiNet is a MIDI network gateway application that sends and receives MIDI data (ALSA-MIDI [9] and JACK-MIDI [8]) over the network, using UDP/IP multicast. Inspired by multimidicast [15] and designed to be compatible with ipMIDI [16] for Windows. Change-log: - Fixed lost or out of order messages on JACK-MIDI client. - Prepping into the next development cycle (with Qt >= 6.5). Website: https://qmidinet.sourceforge.io http://qmidinet.sourceforge.net Project page: https://sourceforge.net/projects/qmidinet Downloads: https://sourceforge.net/projects/qmidinet/files - source tarball: https://download.sf.net/qmidinet/qmidinet-0.9.10.tar.gz - source package: https://download.sf.net/qmidinet/qmidinet-0.9.10-54.1.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qmidinet/qmidinet-0.9.10-54.1.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qmidinet/qmidinet-0.9.10-54.1.x86_64.AppImage Git repos: https://git.code.sf.net/p/qmidinet/code https://github.com/rncbc/qmidinet.git https://gitlab.com/rncbc/qmidinet.git https://codeberg.com/rncbc/qmidinet.git -- License: All of the Qstuff* are free, open-source Linux Audio [11] software, distributed under the terms of the GNU General Public License (GPL) version 2 or later [12]. References: [1] QjackCtl - A JACK Audio Connection Kit Qt GUI Interface https://qjackctl.sourceforge.io [2] Qsynth - A fluidsynth Qt GUI Interface https://qsynth.sourceforge.io [3] Qsampler - A LinuxSampler Qt GUI Interface https://qsampler.sourceforge.io [4] QXGEdit - A Qt XG Editor https://qxgedit.sourceforge.io [5] QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast https://qmidictl.sourceforge.io [6] QmidiNet - A MIDI Network Gateway via UDP/IP Multicast https://qmidinet.sourceforge.io [7] Qt framework, C++ class library and tools for cross-platform application and UI development https://qt.io/ [8] JACK Audio Connection Kit https://jackaudio.org [9] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [10] FluidSynth - A SoundFont Synthesizer A real-time software synthesizer based on SoundFont 2 specifications https://www.fluidsynth.org [11] LinuxSampler - The Linux Sampler Project A modular, streaming capable, realtime audio sampler https://www.linuxsampler.org [12] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [13] GPL - GNU General Public License https://www.gnu.org/copyleft/gpl.html [14] Yamaha DB50XG (https://web.archive.org/web/20150607065739/) http://www.soundonsound.com/sos/1996_articles/may96/yamahadb50xg.html [15] multimidicast - sends and receives MIDI from ALSA sequencers over network https://llg.cubic.org/tools/multimidicast [16] ipMIDI - MIDI over Ethernet ports - send MIDI over your LAN https://nerds.de [17] Maemo.org - Home of the Maemo community https://www.maemo.org [18] Maemo.org Wiki - Nokia N900 https://wiki.maemo.org/Nokia_N900 [19] Maemo.org - Downloads: QmidiCtl https://maemo.org/downloads/product/Maemo5/qmidictl [20] AppImage, Linux apps that run anywhere https://appimage.org/ [21] Flatpak, next-generation technology for building and distributing desktop applications on Linux https://flatpak.org/ See also: https://www.rncbc.org/drupal/node/2439 See you all soon! -- rncbc aka Rui Nuno Capela

2 years, 2 months

spectmorph-0.6.0

by Stefan Westerfeld

spectmorph-0.6.0 has been released. The new main features are: - SpectMorph now provides a CLAP plugin. - A filter with different filter modes was added. - A new, more flexible modulation system was added. - SpectMorph now provides visual feedback for modulated parameters. Video Tutorial for 0.6.0: https://youtu.be/watch?v=scKrf0o6e6k What is SpectMorph? ------------------- SpectMorph is a free software project which allows to analyze samples of musical instruments, and to combine them (morphing). It can be used to construct hybrid sounds, for instance a sound between a trumpet and a flute; or smooth transitions, for instance a sound that starts as a trumpet and then gradually changes to a flute. SpectMorph ships with many ready-to-use instruments which can be combined using morphing. SpectMorph is implemented in C++ and licensed under the GNU LGPL version 2.1 or later Integrating SpectMorph into your Work ------------------------------------- SpectMorph is currently available for Linux, Windows and macOS (Intel and Apple Silicon), with CLAP/LV2/VST plugins. Under Linux, there is also JACK Support. Links: ------ Website: http://www.spectmorph.org Download: http://www.spectmorph.org/downloads There are many audio demos on the website, which demonstrate morphing between instruments. List of Changes in SpectMorph 0.6.0: ------------------------------------ #### New features * New, more flexible modulation system * Added filter with different filter modes * Provide visual feedback for modulated properties * Provide signed .pkg installers for macOS (Intel and ARM) #### CLAP Plugin * Provide CLAP Plugin * Support for per-voice modulation * Support timestamped modulation/automation events #### LV2 Plugin * Support LV2 on all platforms * Fix crashes triggered by Carla (absolute_path/abstract_path returning NULL) * Support newer LV2 development headers #### Minor Changes * Support "Velocity" as modulation source * Make pitch bend range configurable * New Presets with filter: "Cheese Cake Bass", "Liquid Silver" * Sort midi events by timestamp to workaround Bitwig bug * Sliders now support shift+drag for fine editing * Support for Apple Silicon * Avoid crashes if XOpenIM / XCreateIC return NULL (#15). * Fix statically linked plugin data directory location (works in flatpak apps now). * Add dockerized MXE builds for windows, bump compiler version to gcc-12. * Bump minimum C++ standard to C++17 * Fix build on RISC-V (#13) * Use GitHub CI for Linux, macOS and Windows * Change license from "LGPL v3 or later" to "LGPL v2.1 or later". * Minor fixes and cleanups #### Internals: Properties * Add generic property handling * Simplify load/save/gui for properties * Support modulatable properties using ModulationList * Add gui for editing property value and ModulationList * MorphPlan is no longer ref-counted, just one instance per Project * Introduced MorphOperatorConfig objects for cleaner/faster parameter updates #### Internals: Filter * Add two filter types: "Ladder" and "Sallen-Key" filter to output operator * Integrated PandaResampler for SIMD 4x filter oversampling * Support modulation with high time resolution for filter #### Internals: UI Toolkit * Support multiple update regions in UI toolkit * Optimize drawing for UI toolkit * Support "software sprites" for efficient visual feedback * Map Ctrl+Left Click to Right Click on macOS #### Internals: Optimizations * Pass wav set pointers (instead of strings) to morph linear/grid/source. * Avoid fmod() for phase truncation. * Build using -ffast-math * NotifyBuffer: fast dsp thread -> ui thread notifications (no malloc in dsp thread) * Avoid allocations in dsp thread in many cases (retrigger, noise decoder process) * Support optimized SIMD code on ARM (Apple Silicon), code from Peter Johnson (#11) -- Stefan Westerfeld, http://space.twc.de/~stefan

2 years, 2 months

stereospread.lv2 - Stereo spreading plugin (conjugate random phase all-pass filter pair)

by Florian Paul Schmidt

Hi, I wrote a small plugin for spreading mono content to stereo and I would like to receive some feedback on it from people more knowledgable in DSP matters than me. It has one nice property: It spreads the signal over the spectrum by way of a conjugate pair of random phase all-pass filters, and since it's a conjugate pair it sums back to unity when down-mixing to mono. So, no ugly comb filter effects like when downmixing a Haas-expanded signal. https://github.com/fps/stereospread.lv2 The page has an example sound.. How it works: It's actually rather simple: 1. create a vector of random phases (matlab notation): filter_length = 1000; spread = pi; hfft1 = exp(-1i*(spread*rand(filter_length,1) - spread/2)); And for the second filter just take the complex conjugate: hfft2 = conj(hfft1); This ensures that what is a phase theta in the first filter becomes a phase of -theta in the second filter, and summed that just gives a phase of 0. 2. Then assemble the coefficients such that it corresponds to a fft of a real signal and do the inverse fft (possibly I have a small error here which i needed to fix with the 'symmetric' flag in matlab): f1 = ifft([1; hfft1; conj(hfft1((end-1):-1:1))], 'symmetric'); f2 = ifft([1; hfft2; conj(hfft2((end-1):-1:1))], 'symmetric'); 3. The two IRs f1 and f2 implement the pair of filters and can be applied via convolution (which the above plugin does). It seems to be possible with little ill effect to reduce the length of the filter down to a size of 50 samples or so by just cutting it off before the convolution. What do you think? Kind regards, FPS -- https://dfdx.eu

2 years, 2 months

Help with Alsa lib

by ollie razdow

I'm a bit of a noob to linux audio programming, but I'm stuck with alsa lib and wondering if someone could help. When I use the function snd_dtl_open I get the error: Cannot open shared library libasound_module_conf_pulse.so (/usr/lib/alsa-lib/libasound_module_conf_pulse.so The library exists in /usr/lib/x86_64-linux-gnu/alsa-lib/l, but not /usr/lib/alsa-lib which doesn't exist. I suppose I could create a symlinked folder, but I'm wondering why alsa looks in that directory and what I can do get it working correctly? Thanks for any advice.

2 years, 3 months

liquidsfz-0.3.2

by Stefan Westerfeld

liquidsfz-0.3.2 has been released The main goal of liquidsfz is to provide an SFZ sampler implementation library that is easy to integrate into other projects. A standalone jack client and a LV2 plugin is also available. liquidsfz is implemented in C++ and licensed under MPL-2.0. The release tarball can be downloaded here: https://github.com/swesterfeld/liquidsfz#releases Overview of Changes in liquidsfz-0.3.2: * Fix crashes triggered by Carla while saving without path * Allow multiple overlapping notes during sustain (#38) * Provide cross compiled LV2 plugin for Windows * Use LV2_STATE__freePath if available (fixes LV2 on windows) * Fixes for building on macOS and Windows * Improve tests and CI checks -- Stefan Westerfeld, http://space.twc.de/~stefan

2 years, 3 months

snd-firewire-ctl-services 0.1.0 released

by Takashi Sakamoto

Hi all, This is a short announcement about a new release of snd-firewire-ctl-services project. After development for mostly three years[1], version 0.1.0 is released today. If you have FireWire audio device and interests in ALSA support, the release would be worth to check out. * https://github.com/alsa-project/snd-firewire-ctl-services/releases/tag/snd-… The project provides user space service programs to operate digital signal processing function in devices supported by ALSA firewire stack. If using such device, you can configure DSP functions such as the volumes of device. For some device, effects such as dynamics and equalizers are also configurable. Available devices are listed in README.rst of the project. The service programs work as 'message broaker'. ALSA control applications are available for end-user interface to communicate to the service programs[2]. The device connected to IEEE 1394 bus is the peer. The service programs receives messages from both ends, then translates and convert the messages to send to the opposite end. Against your expectation, the project provides neither GUI programs nor end-user interfaces. I know that the user experience is heavily on look-and-feel on the GUI programs, while it is out of the aim of project. I daily use quashctl in QasTools[3] and it is pretty good to me for such ALSA control application. If encountering any issue, please file it to github repository[4]. README should be helpful to new users. Thanks for your support and long patience to ALSA firewire stack. [1] https://lists.linuxaudio.org/hyperkitty/list/linux-audio-dev@lists.linuxaud… [2] For TASCAM FireWire series, ALSA sequencer application is such end as well to operate control surface. [3] https://gitlab.com/sebholt/qastools [4] https://github.com/alsa-project/snd-firewire-ctl-services Regards Takashi Sakamoto

2 years, 3 months

I'm being stalked, please be weary

by Jeanette C.

Hey hey, I am being stalked and the stalker has already contacted people I am connected with. Please, if anyone contacts you with any request, be weary. It's a plain name gmail address. Thank you and sorry to bother you! Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c Do you even know what I like Just what I'm living for, What I adore <3 (Britney Spears)

2 years, 3 months

[LAA] New LV2 plugin: B.Silent

by Sven Jaehnichen

Hi, worried about the daily life noise level? But you only want a bit - silence? Then B.Silent is the virtual instrument to make your dreams come true. B.Silent is a unique MIDI instrument to produce silence in highest quality. Choose between 8 hand-selected types of silence provided as built-in presets to play silence in a never heard cleanliness. No background noise, no distortion, no glitches, only pure silence. Github: https://github.com/sjaehn/BSilent Video: https://www.youtube.com/watch?v=6-8g2qBZhSI Enjoy the silence! Released April 1, 2023 Sven

2 years, 4 months

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Linux-audio-dev