Linux-audio-dev February 2014

linux-audio-dev@lists.linuxaudio.org

27 participants
31 discussions

by Mark Hills

On Mon, 24 Feb 2014, David J Myers wrote: > I need to take the audio input from my sound hardware on one Linux box, > send it over the network to a second Linux box and play it back on the > second box sound hardware. > Can this be done using jackd and jack_netsource without modification? If > not, can it be done with a simple Jack applet of my own? If not, how can > I implement this quickly without writing my own streaming server and > client? Without wanting to hijack the thread (your subject is NetJack but your question more general), I had a similar use case and this could be useful to you: http://www.pogo.org.uk/~mark/trx/ Thanks -- Mark

11 years, 1 month

Re: [LAD] NetJack question

by Paul Davis

On Mon, Feb 24, 2014 at 10:38 AM, David J Myers < david.myers(a)amg-panogenics.com> wrote: > > user@ubuntu:~$ jackd -d net > jackd 0.121.2 > JACK 1 is now at 0.124.1 ... upgrading is recommended. You are using a version that is heading towards 4 years old.

11 years, 1 month

Re: [LAD] NetJack question

by Adrian Knoth

On Mon, Feb 24, 2014 at 11:58:21AM -0000, David J Myers wrote: > I need to take the audio input from my sound hardware on one Linux box, send > it over the network to a second Linux box and play it back on the second box > sound hardware. Yes. Using the latest jackd1 release will make this easier, however, you can also go for whatever your distribution has available. Basically, you run $ jackd -d alsa on the first box and $ jackd -d net on the second. If you have jackd2, it would be "netone", not "net". You then use Fons' zita-ajbridge on the second machine to connect to your physical I/O. (they replace the older alsa_in/out tools) The latest jackd1 can do the last two steps in one step. Maybe netjack2 is also an option for you. Go for whatever works. Cheers -- mail: adi(a)thur.de http://adi.thur.de PGP/GPG: key via keyserver

11 years, 1 month

NetJack question

by David J Myers

Hi there, I'm trying to find out whether I can use NetJack1 to do the following:- I need to take the audio input from my sound hardware on one Linux box, send it over the network to a second Linux box and play it back on the second box sound hardware. Can this be done using jackd and jack_netsource without modification? If not, can it be done with a simple Jack applet of my own? If not, how can I implement this quickly without writing my own streaming server and client? Many thanks for your time. DavidJ

11 years, 1 month

Re: [LAD] [LAU] JACK latency API clarifications

by Lieven Moors

On Fri, Feb 21, 2014 at 03:29:40PM -0500, Paul Davis wrote: > On Fri, Feb 21, 2014 at 3:27 PM, Lieven Moors <lievenmoors(a)gmail.com> wrote: > > > Aren't most clients checking for > > the sample rate in the process callback anyway? > > > if they are, then they are doing it wrong. That would be me ;-) I probably did this because I thought it could change at period boundaries. Could you explain why it is wrong?

11 years, 1 month

FVWM-Crystal-3.3.2 is out

by Dominique Michel

This is an exceptional announcement. You may ask why announce a FVWM-Crystal release on the LAA, fvwm-crystal being a desktop. That's simple, fvwm-crystal was improved in 3.3.0 with a key modifier editor which let you change its key modifiers. This will affect only the extensive set of fvwm-crystal own key-bindings, and the key bindings of other applications will remain fully unaffected. That's a very easy and fast way to have the extensive key-bindings set of applications like ardour or emacs to not collide with the desktop. During the last 2 years, a lot of bug fixes was done, the existing features was improved and unified between the recipes, and new features was added. The list of changes is so huge that it is better to try it for yourself, if you don't already have done it. During the last few months, a particular effort was made to fix some nasty bashisms. That should make fvwm-crystal to work much better with distributions using dash as default shell, and fix one hopefully unnoticed security issue. A short and very partial story of the last releases: 3.3.2 bring 2 new recipes with ACPI support (battery, cpu speed and temperature). 3.3.1 bring a new and complete Dutch translation and a Preference Editor for the preferences that don't have menu options. It bring too a pot file for easy translations in new languages. 3.2.6 see an updated Russian translation and x-terminal-emulator support (Debian). 3.2.4 add mount/umount/pmount/pmount-gui support with the built-in desktop icons. 3.2.1 finally succeed to remove the restart with all preference changes but one. 3.2 see a complete rewrite of the Thunar desktop icons manager. Not only the buttons was redone from the scratch into a single button, which fix the flickering, but also a new implementation of the associated actions was done. Now it's possible to associate any file manager you can think about with these icons, 2 are supported at the same time, as well than custom commands. ... For a complete list, see the ChangeLog file. Download: https://sourceforge.net/projects/fvwm-crystal/files/?source=navbar Website: http://fvwm-crystal.sourceforge.net/ Project site: https://sourceforge.net/projects/fvwm-crystal/?source=navbar Enjoy, Dominique

11 years, 1 month

JACK latency API clarifications

by Stefano D'Angelo

Hi all, Let's say I have a client that introduces an amount of latency that's variable at runtime and potentially unbounded. From JACK's docs it seems that you need to recompute the min/max latencies in the latency callback that's called "by the server" whenever it feels like, but you can force that by calling jack_recompute_total_latencies (right?). The problem is, you are advised to call this last function only after calling jack_port_set_latency_range(), which you should only call in the latency callback, which may be called next month... am I dumb (probably) or is there a deadly loop? I couldn't find code handling dynamic latencies around and I'm way too lazy to try to understand JACK internals or to make silly tests etc. (also because they would tell nothing since we have multiple implementations of the same JACK API). Stefano

11 years, 1 month

opencl benchmark results

by Patrick Shirkey

Hi, For those of you who are interested real world results for ffmpeg with opencl we have run some benchmarking tests across our cluster. At the end of last year there was a flurry of activity integrating opencl with ffmpeg. The work was undertaken by multicorewareinc who is also the official keeper of the code for AMD's proprietary version of ffmpeg. We have found that leveraging opencl with the latest development version of ffmpeg gives us upto 4566 DP-MFLOP on a single machine. Adding in the OpenCL component (GPUs) gives us around a 64% speed boost on AMD A4's. We got upto 400% increase on our intel machines (with alot of NVidia CUDA cores). We also noticed that essentially the same AMD/ATI card on a different bus (AGP-8 versus PCI-E) only picked up an extra 6% in speed. So clearly the recent work on the opencl integration with ffmpeg has provided some real world dividends. Just for the record our local cluster is clocking in around 20GFlops with the opencl code in the mix. We haven't added in the cloud servers though so that number is low. While we are not a not a threat to the big players, combining resources within the wider open source community creates a very serious competitor that shouldn't be ignored. Cheers -- Patrick Shirkey Boost Hardware Ltd

11 years, 1 month

Zita Resampler unexpected output

by André Garnier Coutinho

Hi Guys! I was doing some tests to learn how to use zita resampler and I got an unexpected output. All the last positions of my output vector were 0 and I don't know why. I have copied the main files of zita resampler to my home directory. The files were resampler.cc, resampler-tables.cc, vresampler.cc and their respective headers. I have done this because I will need to modify the source code to use it with double precision vectors. Does anyone know what I am doing wrong? I'm trying to do this to improve mod-DS1's performance. https://github.com/portalmod/mod-distortion I'm attaching my code. greets André

11 years, 1 month

Re: [LAD] Call for testing (final): ALSA driver for some firewire devices

by Takashi Sakamoto

> still no audio is captured, apparently... > this card has 16 inputs, maybe I should specify somehow which one > should be used? The aplay/arecord has 'D' option. This option is used to indicate PCM device. When you omit this option, 'default' PCM device is used. In system with PulseAudio, 'default' PCM device is set as input/output from/to PulseAudio. I guess you record from PulseAudio, not directly from your device. Would you test with 'D' option? Like: $ arecord -D hw:UFX1604 -c 16 -f S32_LE -r 44100 /tmp/test.wav Thanks Takashi Sakamoto o-takashi(a)sakamocchi.jp

11 years, 1 month

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Linux-audio-dev February 2014