Linux-audio-dev

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2 participants
7534 discussions

[LAD] [ANN] Qtractor 0.9.22 - A Spring'21 Release batch #3

by Rui Nuno Capela

Hello one third and last time time, for a little while :) Didn't you know? Qtractor 0.9.22 (spring'21) has been released! Change-log: - Fixed one terribly old and overlooked mistake that was preventing MIDI tracks volume and panning automation to take effect on audio export. - All packaging builds switching to CMake. [8] Description: Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: https://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net Project page: https://sourceforge.net/projects/qtractor Downloads: https://sourceforge.net/projects/qtractor/files - source tarball: https://download.sf.net/qtractor/qtractor-0.9.22.tar.gz - source package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.22-64.rncbc.suse.src.rpm - binary package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.22-64.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qtractor/qtractor-0.9.22-64.x86_64.AppImage Git repos: https://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://bitbucket.org/rncbc/qtractor.git Wiki (outdated; help wanted, please): https://sourceforge.net/p/qtractor/wiki/ - static rendering: https://qtractor.org/doc http://qtractor.sourceforge.net/doc https://qtractor.sourceforge.io/doc - user manual & how-to's: https://download.sf.net/qtractor/qtractor-manual-and-howtos.epub https://download.sf.net/qtractor/qtractor-manual-and-howtos.pdf License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer https://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development https://qt.io/ [3] JACK Audio Connection Kit https://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [6] GPL - GNU General Public License https://www.gnu.org/copyleft/gpl.html [7] AppImage, Linux apps that run anywhere https://appimage.org/ [8] CMake, a cross-platform, open-source build system generator https://cmake.org See also: https://www.rncbc.org/drupal/node/2228 Stay safe && Keep the fun, always! -- rncbc aka Rui Nuno Capela

4 years, 8 months

[LAD] SysEx data-conversion woes: nibbles and complements (Microwave 2)

by Jeanette C.

Hey hey, I have a problem. I'm trying to understand the Waldorf Microwave 2/xt's waveform data dump. The SysEx manual seems clear and direct enough, but I can't get anywhere. In short: these synthesizers can load 8bit single cycle waveforms. Only a half cycle is sent, the second half is created by "mirroring"/negating the first half: Wave[64+n] = -Wave[63-n] To store 8bit samples in the SysEx format, which can only use 7bit, the samples were split into nibbles. Here's what the SysEx manual says about conversion to a signed char: "... Not(e) that samples are not two's complement format, to get a signed byte, the most significant bit must be flipped: signed char s = Wave[n]^0x80; ..." The whole wave dump format is defined as: "f0 3e 0e Dev_id 12 location_1 location_2 "128 bytes of wave data" chksum f7" Wave Data: index range description 0 0-0f sample1, most significant nibble 1 0-0f sample 1, least significant nibble ... Knowing all that, I tried a few things, but still couldn't get any sensible result. Here's a wave dump of wave 1, which I assume is the sine wave Complete SysEx dump: https://www.dropbox.com/s/v50wq3x55bh52l8/full_wav_dump.syx Only the wave data (128 bytes): https://www.dropbox.com/s/q5rcm3cvtfp8cdu/pure_wave_data.dat Could someone please help me on how to convert one sample from this data and vice versa, please? 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 And I love the way with just one whisper You tell me everything <3 (Britney Spears)

4 years, 8 months

[LAD] [ANN] Vee One Suite 0.9.22 - A Spring'21 Release batch #2

by Rui Nuno Capela

Hello again! The 'Vee One Suite' of 'old-school' software instruments, * synthv1 [1] as a polyphonic subtractive synthesizer; * samplv1 [2] a polyphonic sampler synthesizer; * drumkv1 [3] as yet another drum-kit sampler; * padthv1 [4] as a polyphonic additive synthesizer. Are all here and now for the second batch to the so called 'QStuff*' (northern) Spring'21 release season. Rejoice. And still delivered in dual form:: - a pure stand-alone JACK client with JACK-session [5], NSM (Non Session Management [6]) and both JACK MIDI and ALSA MIDI [7] input support; - a LV2 instrument plug-in [8]. Changes for this season are rather janitorial: - All packaging builds switching to CMake. [12] The 'Vee One Suite' are free, open-source Linux Audio [10] software, distributed under the terms of the GNU General Public License (GPL) [11] version 2 or later. And here they are again... **synthv1 - an old-school polyphonic synthesizer [1] ** synthv1 0.9.22 (spring'21) is out! synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: https://synthv1.sourceforge.io http://synthv1.sourceforge.net project page: https://sourceforge.net/projects/synthv1 downloads: https://sourceforge.net/projects/synthv1/files - source tarball: https://download.sf.net/synthv1/synthv1-0.9.22.tar.gz - source package: https://download.sf.net/synthv1/synthv1-0.9.22-63.rncbc.suse.src.rpm - binary packages (openSUSE Tumbleweed): https://download.sf.net/synthv1/synthv1-jack-0.9.22-63.rncbc.suse.x86_84.rpm https://download.sf.net/synthv1/synthv1-lv2-0.9.22-63.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/synthv1/synthv1-jack-0.9.22-63.x86_64.AppImage git repos: https://git.code.sf.net/p/synthv1/code https://github.com/rncbc/synthv1.git https://gitlab.com/rncbc/synthv1.git https://bitbucket.org/rncbc/synthv1.git **samplv1 - an old-school polyphonic sampler [2]** samplv1 0.9.22 (spring'21) is out! samplv1 is an old-school polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: https://samplv1.sourceforge.io http://samplv1.sourceforge.net project page: https://sourceforge.net/projects/samplv1 downloads: https://sourceforge.net/projects/samplv1/files - source tarball: https://download.sf.net/samplv1/samplv1-0.9.22.tar.gz - source package: https://download.sf.net/samplv1/samplv1-0.9.22-63.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/samplv1/samplv1-jack-0.9.22-63.rncbc.suse.x86_84.rpm https://download.sf.net/samplv1/samplv1-lv2-0.9.22-63.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/samplv1/samplv1-jack-0.9.22-63.x86_64.AppImage git repos: https://git.code.sf.net/p/samplv1/code https://github.com/rncbc/samplv1.git https://gitlab.com/rncbc/samplv1.git https://bitbucket.org/rncbc/samplv1.git **drumkv1 - an old-school drum-kit sampler [3]** drumkv1 0.9.22 (spring'21) is out! drumkv1 is an old-school drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: https://drumkv1.sourceforge.io http://drumkv1.sourceforge.net project page: https://sourceforge.net/projects/samplv1 downloads: https://sourceforge.net/projects/drumkv1/files - source tarball: https://download.sf.net/drumkv1/drumkv1-0.9.22.tar.gz - source package: https://download.sf.net/drumkv1/drumkv1-0.9.22-63.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/drumkv1/drumkv1-jack-0.9.22-63.rncbc.suse.x86_84.rpm https://download.sf.net/drumkv1/drumkv1-lv2-0.9.22-63.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/drumkv1/drumkv1-jack-0.9.22-63.x86_64.AppImage git repos: https://git.code.sf.net/p/drumkv1/code https://github.com/rncbc/drumkv1.git https://gitlab.com/rncbc/drumkv1.git https://bitbucket.org/rncbc/drumkv1.git **padthv1 - an old-school polyphonic additive synthesizer [4]** padthv1 0.9.22 (spring'21) is out! padthv1 is an old-school polyphonic additive synthesizer with stereo fx. padthv1 is based on the PADsynth algorithm by Paul Nasca, as a special variant of additive synthesis. LV2 URI: http://padthv1.sourceforge.net/lv2 website: http://padthv1.sourceforge.net https://padthv1.sourceforge.io project page: https://sourceforge.net/projects/padthv1 downloads: https://sourceforge.net/projects/padthv1/files - source tarball: https://download.sf.net/padthv1/padthv1-0.9.22.tar.gz - source package: https://download.sf.net/padthv1/padthv1-0.9.22-63.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): https://download.sf.net/padthv1/padthv1-jack-0.9.22-63.rncbc.suse.x86_84.rpm https://download.sf.net/padthv1/padthv1-lv2-0.9.22-63.rncbc.suse.x86_84.rpm - AppImage [9] package (JACK stand-alone only): https://download.sf.net/padthv1/padthv1-jack-0.9.22-63.x86_64.AppImage git repos: https://git.code.sf.net/p/padthv1/code https://github.com/rncbc/padthv1.git https://gitlab.com/rncbc/padthv1.git https://bitbucket.org/rncbc/padthv1.git References: [1] synthv1 - an old-school polyphonic synthesizer https://synthv1.sourceforge.io http://synthv1.sourceforge.net [2] samplv1 - an old-school polyphonic sampler https://samplv1.sourceforge.io http://samplv1.sourceforge.net [3] drumkv1 - an old-school drum-kit sampler https://drumkv1.sourceforge.io http://drumkv1.sourceforge.net [4] padthv1 - an old-school polyphonic additive synthesizer https://padthv1.sourceforge.io http://padthv1.sourceforge.net [5] JACK Audio Connection Kit https://jackaudio.org/ [6] NSM, Non Session Management http://non.tuxfamily.org/nsm/ [7] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [8] LV2, Audio Plugin Standard, the extensible successor of LADSPA http://lv2plug.in/ [9] AppImage, Linux apps that run anywhere https://appimage.org/ [10] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [11] GNU General Public License https://www.gnu.org/copyleft/gpl.html [12] CMake, a cross-platform, open-source build system generator https://cmake.org See also: https://www.rncbc.org/drupal/node/2226 Have fun && Stay safe && Healthy! -- rncbc aka. Rui Nuno Capela

4 years, 8 months

[LAD] libsamplerate: src_simple issue: sign error perhaps?

by Jeanette C.

Hey hey, I've used libsamplerate through the src_simple interface to resample a audiofile of a single cycle wave. The output does not look right though: In the input values go from positive to negative floats. In the output values go from small positive floats to big positive floats. The process itself is error free and both used and generated frames are exactly to my expectations. Please, does anyone have an idea why this could be? Or if this is an error at all? 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 If only I could trade the fancy cars For a chance today, it's incomparable <3 (Britney Spears)

4 years, 9 months

[LAD] [ANN] The QStuff* Spring'21 Release batch #1

by Rui Nuno Capela

Hi everybody, The first batch of the so called 'QStuff*' is springing out: QjackCtl [1], Qsynth [2], Qsampler [3], QXGEdit [4], QmidiCtl [5] and QmidiNet [6], all bumping to **version 0.9.3** for the (northern) Spring'21 season, rejoice! ** QjackCtl - JACK Audio Connection Kit Qt GUI Interface [1] ** QjackCtl 0.9.3 (spring'21) is 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. 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-0.9.3.tar.gz - source package: https://download.sf.net/qjackctl/qjackctl-0.9.3-47.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qjackctl/qjackctl-0.9.3-47.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qjackctl/qjackctl-0.9.3-47.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://bitbucket.com/rncbc/qjackctl.git Change-log: - Graph connection lines drop-shadow eye-candy has been optimized, improving a lot on moving highly-connected nodes, especially the ones with plenty of backward-curved connections. - All packaging builds switching to CMake. [21] - Fixed default preset/aliases switching and reloading when entering pure-client mode (ie. "Active" status). ** Qsynth - A fluidsynth Qt GUI Interface [2] ** Qsynth 0.9.3 (spring'21) is released! Qsynth is a FluidSynth [10] GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. 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-0.9.3.tar.gz - source package: https://download.sf.net/qsynth/qsynth-0.9.3-47.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qsynth/qsynth-0.9.3-47.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qsynth/qsynth-0.9.3-47.x86_64.AppImage - Win64 and macOS packages (thanks again to Pedro Lopez-Cabanillas): https://download.sf.net/qsynth/qsynth-0.9.3-47.win-x64-setup.exe https://download.sf.net/qsynth/qsynth-0.9.3-47.mac-x64.dmg Git repos: https://git.code.sf.net/p/qsynth/code https://github.com/rncbc/qsynth.git https://gitlab.com/rncbc/qsynth.git https://bitbucket.com/rncbc/qsynth.git Change-log: - New Setup/Audio/WASAPI Exclusive Mode option added. - Fix for Windows runtime error (assertion failed) when compiled with MSVC (by Pedro Lopez-Cabanillas). - New Setup/MIDI/Auto Connect MIDI inputs option added. - Fix deprecated Reverb/Chorus API (FluidSynth >= 2.2.0). - All packaging builds switching to CMake. [21] ** Qsampler - A LinuxSampler Qt GUI Interface [3] ** Qsampler 0.9.3 (spring'21) is released! Qsampler is a LinuxSampler [11] GUI front-end application written in C++ around the Qt framework [7] using Qt Designer. 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-0.9.3.tar.gz https://download.sf.net/qsampler/liblscp-0.9.3.tar.gz - source packages: https://download.sf.net/qsampler/qsampler-0.9.3-47.rncbc.suse.src.rpm https://download.sf.net/qsampler/liblscp-0.9.3-47.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qsampler/qsampler-0.9.3-47.rncbc.suse.x86_64.rpm https://download.sf.net/qsampler/liblscp6-0.9.3-47.rncbc.suse.x86_64.rpm https://download.sf.net/qsampler/liblscp-devel-0.9.3-47.rncbc.suse.x86_64.r… - AppImage [20] package: https://download.sf.net/qsampler/qsampler-0.9.3-47.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://bitbucket.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://bitbucket.com/rncbc/liblscp.git Change-log: - All packaging builds switching to CMake. [21] ** QXGEdit - A Qt XG Editor [4] ** QXGEdit 0.9.3 (spring'21) is 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. 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-0.9.3.tar.gz - source package: https://download.sf.net/qxgedit/qxgedit-0.9.3-37.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qxgedit/qxgedit-0.9.3-37.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qxgedit/qxgedit-0.9.3-37.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://bitbucket.com/rncbc/qxgedit.git Change-log: - All packaging builds switching to CMake. [21] ** QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast [5] ** QmidiCtl 0.9.3 (spring'21) is 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. 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-0.9.3.tar.gz - source package: https://download.sf.net/qmidictl/qmidictl-0.9.3-27.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qmidictl/qmidictl-0.9.3-27.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qmidictl/qmidictl-0.9.3-27.x86_64.AppImage - Android package: https://download.sf.net/qmidictl/qmidictl-0.9.3-27.aab 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://bitbucket.com/rncbc/qmidictl.git Change-log: - All packaging builds switching to CMake. [21] ** QmidiNet - A MIDI Network Gateway via UDP/IP Multicast [6] ** QmidiNet 0.9.3 (spring'21) is 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. 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-0.9.3.tar.gz - source package: https://download.sf.net/qmidinet/qmidinet-0.9.3-27.rncbc.suse.src.rpm - binary packages: https://download.sf.net/qmidinet/qmidinet-0.9.3-27.rncbc.suse.x86_64.rpm - AppImage [20] package: https://download.sf.net/qmidinet/qmidinet-0.9.3-27.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://bitbucket.com/rncbc/qmidinet.git Change-log: - All packaging builds switching to CMake. [21] 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] CMake, a cross-platform, open-source build system generator https://cmake.org See also: https://www.rncbc.org/drupal/node/2224 Keep having fun && stay healthy, always! -- rncbc aka Rui Nuno Capela

4 years, 9 months

[LAD] Cli sound file player requirements

by John Murphy

I need a command line sound file player which I can somehow control, while playing, to go immediately to a new position in the same file and keep playing without missing a beat. And a way to pause/continue. I'm currently using sox (from a Qt QProcess) and I can stop it with a 'kill' QProcess, but I seem to find that 'kill one start another' leaves some overlap (but it could be me). Thanks for any thoughts. If it could also output feedback on the current play position, it would save me tracking the position in Qt with a timer, which works (and looks quite good on a QLCDNumber) but... -- Thanks again, John.

4 years, 9 months

[LAD] Converting single-cycle wave to harmonic spectrum

by Jeanette C.

Hey hey, I'm trying to convert a single cycle wave to a harmonic spectrum. I know that in theory this is a job for standard FFT. I wondered if there isn't a "simpler" way given a few assumptions about the input. The input waveform is exactly one single cycle The waveform has only harmonic overtones. That means that only integral multiples of the base frequency need to be considered and the specific Nyquist frequency is determined by the number of samples (I think). I treid searching, but it appears that I don't have the right keyword to hand, getting only very general results bordering on the off-topic. :) Can anyone help? A good keyword, name of an algorithm or a general name for this specific task would be helpful enough, I suppose. 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 She's so lucky, she's a star But she cry, cry, cries in her lonely heart... <3 (Britney Spears)

4 years, 9 months

[LAD] update of zita-njbridge

by Fons Adriaensen

Hello all, zita-njbridge 0.4.8 is now available at the usual place. Changes: * added --ipv4 and --ipv6 options * removed some unused code * some minor fixes Ciao, -- FA

4 years, 9 months

[LAD] OT: Documentary: Sisters with Transistors

by Kevin Cole

I know it's a bit off-topic but I suspect there are a lot of people on these lists who would appreciate the newly released film: https://www.theguardian.com/film/2021/apr/23/sisters-with-transistors-revie…

4 years, 9 months

[LAD] FFmpeg and JACK output

by Filipe Coelho

Hello everyone. I was in the need for ffmpeg to output directly to JACK, which is not supported upstream. (It has JACK input support, as in recording something from JACK and feed it to something else, but not the other way around) After trying a couple of methods that didn't work so great, like fifos or bridging through alsa loopback, I just went ahead and implemented this part in FFmpeg. You can find the relevant code at https://github.com/falkTX/FFmpeg/tree/n4.4-jackoutdev Not yet submitted upstream, still doing some testing. If this is something useful for you, feedback / comments on the code is very welcome. The relevant part sits at this file https://github.com/falkTX/FFmpeg/blob/n4.4-jackoutdev/libavdevice/jack_enc.c Have a great weekend!

4 years, 9 months

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Linux-audio-dev