Linux-audio-dev August 2016

linux-audio-dev@lists.linuxaudio.org

8 participants
7 discussions

by Tim Goetze

http://quitte.de/dsp/caps.html The latest release of the caps audio plugin suite contains a number of bug fixes and improvements as well as changes intended to make it more suitable for low-power systems. http://quitte.de/dsp/caps.html#CHANGES Most notably, support for a variety of little-used features has been dropped, reducing the binary size by roughly a third. There's also a new plugin implementing simplistic linear emulation of several guitar amplifier loudspeaker cabinets with reduced computational complexity: http://quitte.de/dsp/caps.html#CabinetIII The compressor plugins now report current gain reduction: http://quitte.de/dsp/caps.html#Compress http://quitte.de/dsp/caps_0.9.24.tar.bz2 Cheers, Tim

5 years, 6 months

Hi, I'm new

by Guy Sherman

Hi all, I just found this list after being directed to the IRC channel over the weekend. I'm new here! Lately I've been dabbling in a bit of open-source audio development (I say open-source rather than linux, because I've been dabbling on both linux and windows). Anyhow, amongst other things I've been trying to teach myself about DSP, so I wrote a really (really, really, really) naive distortion plugin. I was wondering if anyone would be interested in taking a look at it and giving me some feedback, and tips on where to go next. I wrote a little about it here: http://guysherman.com/2015/08/30/my-first-ever-audio-plugin/ And the code is at: https://github.com/guysherman/si-plugins I've got some other projects on the boil that I've been talking about with the crew from the Ardour list, which I'll mention here when they take shape a little more. Cheers, Guy. -- Guy Sherman *e:* guy(a)guysherman.com *w: *http://guysherman.com

7 years, 7 months

Mixed boolean & numbers

by Will Godfrey

I'm finding quite a lot of occasions where variables defined as 'bool' are sometimes being set with true or false and other times 0 or 1. On one occasion there is something like x = n + {boolean variable} This last one seems quite unsafe to me as I didn't think the actual value of true and false was guaranteed. Am I being overly cautious or should I change them all to one form or the other? -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

7 years, 7 months

Audio plugins: Streamable audio ports?

by Tim E. Real

Are there any plugin architectures that allow input data length different than the output length such that the 'run' function can ask for more or less input data, for example via some kind of stream? Instead of passing 'run' a block of data, host would pass these streams so that 'run' can pull and push whatever lengths it needs. There would be compatibility information on each stream so that other streams could accommodate. I thought I read of an LV2 extension or something... Or am I imagining something like Pulse? Thanks. Tim.

7 years, 7 months

Tascam US-16x08 0644:8047

by Greg

Greetings, I am fairly new to USB dev (in linux in particular, but also in general), but I would very much like to try to get support for the above device working in snd-usb-audio. - Is this an appropriate place to discuss snd-usb-audio? - Are there any recommended reading pointers for behavior of the quirk table? I patched parse_audio_format_rates_v2(), get_sample_rate_v2(), and set_sample_rate_v2(), and through some sort of beginner luck was able to get aplay audio out of the first two channels. That was incomplete hackery though (eg fixed sample rate), and I would like to learn how to properly add quirk support. There have been other reports that this device worked OOTB, but I fail to see how! I've also been examining the traffic to the device with wireshark and a win7 vm, but the learning curve for USB is a bit steep, so I am digesting. (: If anyone can provide suggestions on lsusb output alone, here's what I have: http://pastebin.com/pA9MLQet cheers, Greg [x-post from alsa-devel due to empty thread - see: http://mailman.alsa-project.org/pipermail/alsa-devel/2015-July/094682.html]

7 years, 7 months

Advanced Gtk+ Sequencer v0.7.54 - minor version increases soon

by Joël Krähemann

Hi all I'd like to get some feedback on GSequencer v0.7.54. Many things have changed so far. Good real-time is still a pain especially as doing much GUI interaction. How-ever I have coded a strategy to counter the issue. Here are some new features listed that should work: * automation editor to automate ports, currently only LADSPA, DSSI and Lv2 * Configuration in place of device, pcm-channels, samplerate, buffer size and format * Virtual MIDI mapping to route from GSequencer to DSSI and Lv2 * Notation editor to edit notes of DSSI and Lv2 plugins Things I'm not sure if still works: * auto-scroll of notation editor on playback * export to WAV files with different samplerate and format All existing features for sure: * sequencer editors with copy and later for paste in notation editor * reallocate audio channels and pads * destroy machines * link lines Believed to be broken: * different threading models than super-thread with channel scope are believed to be broken Currently unmaintained: * Original file format temporally replaced by a light-weight one Note: having 128 channels on DSSI or Lv2 synths is a bit over-helming. So you might want to adjust the channels and do MIDI mapping. Cheers, Joël Krähemann

7 years, 8 months

FFADO 2.3.0 released

by Jonathan Woithe

The FFADO developers are pleased to announce FFADO version 2.3.0, a package of userspace drivers for firewire audio interfaces. While there are no significant new features in this version compared to the last, FFADO 2.3.0 contains a large number of incremental improvements. Users of FFADO are encouraged to upgrade. This source-only release can be downloaded from the ffado.org website at http://ffado.org or via the direct link: http://ffado.org/files/libffado-2.3.0.tgz Notable changes include: * Configuration entries added for additional devices which work with the generic support layer (PreSonus Studiolive 32.4.2, Presonus StudioLive 16.0.2, ICON FireXon, Onyx Blackbird and the new Onyx 1640i, among others). * Support added for the newer Focusrite Saffire Pro 26. * Improved build support for various downstream consumers. * Better routing for selected Saffire devices and the Firestudio Mobile. * Significant cleanup and refinement of the M-Audio and Yamaha driver. * Compilation fixes for recent versions of gcc. * Recover from dead streams without causing jackd to shut down. Thanks go out to the developers and users who contributed code and information which went into this release: Kristian Amlie, Melanie Bernkopf, David Binderman, Philippe Carriere, Yves Grenier, Florian Hofmann, Hector Martin, Mathieu Picot, Philippe Ploquin, Stefan Richter, Takashi Sakamoto, Jano Svitok, Karl Swisher, Steven Tonge and Jonathan Woithe.

7 years, 8 months

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Linux-audio-dev August 2016