Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

5 participants
7443 discussions

by Dmitry Baikov

Just can't resist. ---------- Forwarded message ---------- From: Dmitry Baikov <dsbaikov(a)gmail.com> Date: Mar 2, 2007 3:59 AM Subject: jackmidi_alsaseq-0.4 To: Jack Dev List <jackit-devel(a)lists.sourceforge.net> After missing several deadlines, we are finally here. This is the latest and greatest release of jackmidi alsaseq bridge. It is getting ready for inclusion into jackd (I hope), and I'd like to test is as hard as possible. I hope you will help me here :) Everything it needs is an svn version of jackd. For timing it by default uses hrtimers (available on 2.6.19+), there 3 more variants for your pleasure: select, poll and alsa queues. To enable them, uncomment corresponding define in the beginning of alsa_seqmidi.c. Although, hrtimers (via clock_nanosleep) shows the best results. Alsa queues suffer from events reordering, unless used with jack_time.patch. This is NOT a problem of alsa-seq, but is nearly impossible to avoid. To sum up, the default setting (clock_nanosleep) gives the best results so far. Regards, Dmitry.

17 years, 7 months

[linux-audio-dev] Re: [linux-audio-user] Open letter to Steve Ballmer

by Lee Revell

On 3/2/07, Nick Copeland <nickycopeland(a)hotmail.com> wrote: > If Microsoft patent any capabilities that are present in the ALSA codestream > them ALSA itself is exempt from the patent. This is written into the patent > laws, they cover the possibliity that somebody had a product that was later > patented by some other, wiser party. If the company in potential infringment > can prove prior implementation then they are exempt. > Prior art doesn't exempt the first implementor, it invalidates the patent, at least in the US. Lee

17 years, 7 months

[linux-audio-dev] Open letter to Steve Ballmer

by Marc-Olivier Barre

Hi, Since Microsoft recent audio related patent "that looks a lot like ALSA", I thought this could be interesting : http://www.showusthecode.com/ In short it's an open letter to Steve Ballmer asking him to show the code and patents that Linux supposedly copied from Microsoft (haha, what a joke...) Happy reading, __________________ Marc-Olivier Barre, Markinoko.

17 years, 7 months

[linux-audio-dev] Can we use Gmail on the new site

by Frank Smith

HI All my mail gets stopped as I'm using Gmail. This is an issue with older sendmail filters I believe. Cheers Bob

17 years, 7 months

[linux-audio-dev] variable audio stream ?

by Dominique Michel

After the bug fixes release of Alsaplayer, the hard work has begun. A discussion comes on our todo list in regards with new input plugins. We have an experimental wavpack plugin that constantly check the frame size. Does anyone ever hear about streams with variable byte-per-sample and frequency parameters (for example, at start it was 16bit/2ch/44100 but in the middle it will be 24bit/5ch/48000)? (for wavpack or other formats as well) Ciao, Dominique

17 years, 7 months

[linux-audio-dev] audiogui

by Leonard Ritter

On Thu, 2007-02-22 at 06:42 -0600, Jan Depner wrote: > I can say that the QT package is much easier to use and has > better documentation and support. Not that GTK is terrible, it's just > not as polished or professional. the enemy of the good is the better. i, for one, used the past 3 days to write a python module named "audiogui", which provides widgets to mimick the look and feel of traditional audio hardware panels (i dare you to start an audio ui design war with me). it will be the base for providing an engine which renders panels from stylesheets, to be used with plugins of aldrin - but of course that whole thing could be connected to an OSC library and control any DSSI host. the basic idea was to imitate the design seen from native instruments plugins and propellerheads reason. of course i'm damn proud that the results look so well ;) here is a demo showing the three widgets DecoBox, Knob and LCD, with different settings applied. http://www.paniq.org/images/audiogui5.png in case you want to play with it, the module is based on PyGTK+ and Cairo, and can be checked out from the aldrin svn. http://svn.zeitherrschaft.org/aldrin/trunk you find the scripts in share/aldrin, they are named audiogui.py and lcdfont.py. run audiogui.py for above demonstration. -- Leonard Ritter -- Freelance Art & Logic -- http://www.leonard-ritter.com

17 years, 7 months

[linux-audio-dev] alsaseq reorders my events

by Dmitry Baikov

Hi! I nearly finished alsaseq driver for jackmidi, but have a problem. Alsaseq reorders events in fast sequences, so note-on/note-off pairs got mixed. The algorithm of sending is simple: snd_seq_ev_schedule_real(&alsa_event, output_que, 1, &timestamp); frame_time = jack_frame_time(self->jack); frame_offset = event.time - frame_time; offset = ((long long)frame_offset) * 1000000000 / rate; timestamp.tv_sec = (long) (offset / 1000000000); timestamp.tv_nsec = (long) (offset % 1000000000); snd_seq_event_output(self->seq, &alsa_event); Here are the traces of what is going on: jackmidi_alsaseq reads events from external midi interface and send them to another midi interface. Log shows what is being sent to alsaseq and when. Output format is: [event] at [event.time] ([frame_time] + [frame_offset]) (+[offset]ns) c0ff@ace ~/src/jack/alsamidi $ ./jackmidi_alsaseq port created: in (20:0) MIDI 1 port created: out (20:0) MIDI 1 port created: in (24:0) USB Trigger Finger MIDI 1 port created: out (24:0) USB Trigger Finger MIDI 1 port_event: ADD 130:0 port created: out (130:0) aseqdump 90 4e 7f at 86646526 (86622198 + 24328) (+506833333ns) 80 4e 40 at 86649830 (86622200 + 27630) (+575625000ns) 90 4e 7f at 86654006 (86622201 + 31805) (+662604166ns) 80 4e 40 at 86656795 (86638582 + 18213) (+379437500ns) 90 4e 7f at 86660562 (86638584 + 21978) (+457875000ns) 80 4e 40 at 86663502 (86638584 + 24918) (+519125000ns) 90 4e 7f at 86666819 (86638585 + 28234) (+588208333ns) 80 4e 40 at 86669453 (86638585 + 30868) (+643083333ns) 90 4e 7f at 86673078 (86654965 + 18113) (+377354166ns) 80 4e 40 at 86676430 (86654966 + 21464) (+447166666ns) 90 4e 6f at 86678638 (86654967 + 23671) (+493145833ns) 80 4e 40 at 86680654 (86654968 + 25686) (+535125000ns) We can see that all events go strictly in order (their frame_time is monotonically increasing). Frame offsets are so big, because it runs under jackd -d dummy -p 16384. At the same time, aseqdump is hooked to jackmidi_alsaseq output port: c0ff@ace ~ $ aseqdump Waiting for data at port 130:0. Press Ctrl+C to end. Source_ Event_________________ Ch _Data__ 0:1 Port subscribed 128:5 -> 130:0 0:1 Port subscribed 128:2 -> 130:0 128:2 Note on 0 78 127 128:2 Note off 0 78 64 128:2 Note off 0 78 64 128:2 Note on 0 78 127 128:2 Note on 0 78 127 128:2 Note on 0 78 127 128:2 Note off 0 78 64 128:2 Note on 0 78 127 128:2 Note off 0 78 64 128:2 Note off 0 78 64 128:2 Note on 0 78 111 128:2 Note off 0 78 64 We see, Note on/Note off events are mixed. Your suggestions, please. Regards, Dmitry. P.S. Not wanting to start a flame war, but it is exactly the case, why it's better for jackmidi driver to use as lower-level interface as possible - less problems, more control. P.P.S. alsa-devels, if you reply, please CC me, i'm not subscribed.

17 years, 7 months

[linux-audio-dev] Wiki for Linux Sound & MIDI Software

by Robin Gareus

With ongoing preparation to "Integrate End User and Developer Resources at linuxaudio.org" (workshop @ LAC2007) we are proud to announce a first version of Dave's linux-sound application index as public-wiki: http://apps.linuxaudio.org/ this is by far no cute end-user resource portal yet, but a first step in merging data and setting up a prototype back-end! We are looking for interested people to contribute at various levels and suggest to use the mailing list for general discussion while keeping dokuwiki and style related requests at http://apps.linuxaudio.org/wiki:open_discussion Further [major] back-end development on http://apps.linuxaudio.org/ will probably not happen until LAC2007, but we are interested to tweak the look and feel, fix bugs, and collect feedback. We're also looking for qualified LAU's and LAD's to verify and maintain the current content with editor privileges, responsibilities and deeds. next up: docs.linuxaudio.org: - static documentation (docbook, LateX, [x]html) - slides and presentations (PDF, ps, png jpg,..??) - music (collaborate with or outsource to freesound et al.) - include (external?) video presentations, movies, etc - source code (coding examples: wiki-page; svn-mirror/server ??) for each hosted documentation there will be an option for user annotation(s). eg. wiki-discussion page, blog-comments, email-notify[-mailing-list]? - some of it will be merged with apps.linuxaudio.org which will provide automatic indexing; details remain to be discussed. some of the intended supported formats imply moderation / maintained upload or installation of static documentation. - the ring of maintainers could evolve with key-signatures, and parts of the system may become completely open. - suggestions: http://apps-devel.linuxaudio.org/wiki:suggest_doc ico & robin

17 years, 7 months

[linux-audio-dev] [ANN] Lists moving to linuxaudio.org on the 1st of march.

by Marc-Olivier Barre

Dear list members, On the 1st of march at 0h00 GMT, the three LA* lists will be moved to linuxaudio.org. What will it change for you ? not much : ¤ The new address you send your posts to will be : linux-audio-announce(a)linuxaudio.org for LAA linux-audio-dev(a)linuxaudio.org for LAD linux-audio-user(a)linuxaudio.org for LAU ¤ All the user currently subscribed will be migrated automatically, you do NOT need to create a new account ¤ Your password will be reset in the process, so will your parameters. Sorry we cannot do better than this... To get a password reminder (the first one should be automatically generated), you will find the lists home page at http://lists.linuxaudio.org/ ¤ The former addresses will still be valid, but when you will post to them, you will receive a reminder asking you to post on the new list. To avoid having duplicates when merging archives, the posts on the former addresses _will not be received_ by the list members. ¤ We will have a bigger and faster server, a spamassasin setup and interfacing with mailman is also in progress so administration will be easier _and_ moderation will be less pain (thus faster to do). I hope everything will go smoothly. If any of you run into trouble I will be on #LAD(a)freenode.net during the migration and available at "mobarre at linuxaudio dot org" which will be the new list admin address to help you with anything you'd need. Cheers, __________________ Marc-Olivier Barre, Markinoko.

17 years, 7 months

[linux-audio-dev] Linux Audio Conference 2007 - program online!

by nescivi

Dear all, thanks to many submissions from yourselves, we have been able to create an extensive program for the Linux Audio Conference in Berlin in March, featuring many paper presentations, tutorials, workshops and demos, and not to forget concerts on each night of the conference. (btw, if you still have some linux-made songs you would like to send in for the Radio music, feel free to do so; there are no restrictions on genre there, and we especially created that category to give a place for linux-made recordings). Below is the press release. Hope to see you all in Berlin! ------------ The 5th Linux Audio Conference is taking place in Berlin (Germany) in 2007. The TU-Berlin is hosting the conference in cooperation with people of the Humboldt University Berlin, the Berliner Künstlerprogramm of the DAAD, the festival MaerzMusik, the Instituto Cervantes Berlin and the Tesla Berlin. The conference shows once per year important developments in the subject making music with Linux and open source tools. Invited is everyone who is interested in the possibilities of this platform. The LAC is offering a wide range of workshops, tutorials and hands on demos. There will be presentations on the subjects Computer Music, Music Production, Drivers and Sound Architectures and Audio Distributions. The LAC aims at bringing together developers and users of Linux and open source audio software with the goal of information sharing, project discussion and music. Each day of the conference there is a concert which features music composed and created with open source software. One of the highlights of the conference is the demonstration of a auditorium of the TU-Berlin, that has been equipped with a new spatialisation system (Wave Field Synthesis), driven by a Linux-Cluster. The program of the conference is now online and (free) registration is possible. Free admission to all events except to the concerts at the Tesla and the MaerzMusik LAC2007 22.3. to 25.3.2007, TU-Berlin, www.lac.tu-berlin.de

17 years, 7 months

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Linux-audio-dev