Robin Gareus wiki

sndfile-waveform

Wed, 11 Jan 2012 16:14:44 +0000

Sndfile-waveform

Preface

Erik de Castro Lopo wrote:

Robin Gareus wrote:

I was actually surprised that there's actually no sndfile-waveform
tool, yet! – Yeah right. It's a gimmick :)

You write it and I'll be happy to add it to sndfile-tools.

Erik

LAU email.

Story

The story is told as –help text. The Source is available from the git repository.

A uniform diff for sndfile-tools 1.03 is available from here.

sndfile-waveform - waveform image generator

Create a PNG image file visualizing the waveform of the audio.

Usage: ./src/sndfile-waveform [OPTION]  <sound-file> <png-file>

Options:
  -A, --annotation <COL>    specify text and border color; default 0xffffffff
  -b, --border              diplay a border with annotations
  -B, --background <COL>    specify background color; default 0x99ffffff
  -c, --channel             choose channel(s) to plot, 0: merge to mono
                            <0: all channels vertically separated
  -F, --foreground <COL>    specify background color; default 0x99000000
  -g <w>x<h>,               specify the size of the image to create
      --geometry <w>x<h>    default: 800x192
  -h, --help                display this help and exit
  -l, --logscale            use logarithmic scale
  -r, --rectified           rectify waveform
  -t  <num> [/ <den>]       use timecode instead of seconds for x-axis
      --timecode            numerator must be set, denominator defaults to 1
  -T  <offset>              override the BWF time-reference (if any)
                            the offset is specified in audio-frames
  -V, --version             output version information and exit

Example Images

sndfile-waveform  /tmp/ywbs.wav example0.png

sndfile-waveform -b -t 10 -T 0 -g 800x400 -c -1 -l /tmp/ywbs.wav example1.png

sndfile-waveform -b -r -g 800x200  /tmp/ywbs.wav example2.png

sndfile-waveform -b -g 800x200 -F 0xFFFFFFFF -B 0xFF000000 -A 0xFF000000 -c 1 -l /tmp/ywbs.wav example3.png

IHM -- recursive semantic hypermedia archive

Fri, 16 Dec 2011 17:11:34 +0000

Robin Gareus

CiTu, Université Paris 8; linuxaudio.org

Introduction: The Problem

IHM needs a spiffy media archive :)
There is no appropriate non-commercial solution.
joomla or drupal could be customized; yet that path would require non-sustainable development effort.

Intro.: Motivation / Use-case

Why another content-management system ?

Content means “some sort of information”, management in this context means “doing something with it.”

Most of the CMS are web-site revisioning systems with emphasis on social networks.

We want a system to contain abstract items or objects (i.e. image, article, movie, person, location, comments,..) and be able to define semantic relations between them.

Intro.: Collaborations (1/2)

Potential applications, existing projects, collaborations:

IHM - archive about history of man-machine interfaces
TheArtCollider - platform for connected creation (CiTu, Paris8)
MMDB - MyMovieDatabase (GNU project)
Ozalid - upcoming social network and archive of the Bibliothèque nationale de France
zeega.org - interactive documentaries and new forms of storytelling (Meta-Lab, Harvard)

Intro.: Collaborations (2/2)

Freesound.org - collection of audio-samples
newscoop/superdesk - newsroom production system (sourcefabric.org)
airtime - radio station system (sourcefabric.org)
mmTeX - fan-fiction layout and book publishing engine.

Intro.: Goals / Outline

Complete language-set to define relations
Modular system (extended by plugins)
Publish/subscribe architecture
Social network integration
Pluggable front-ends:
- n-dimensional navigation, timeline
- interoperability with existing authoring tools, apps and data-sets.
- integrated XHTML engine

Implementation: Data Model

The datamodel is a language based on triplets:

“Subject” + “predicate” + “Object”

Where subject and objects are an noun for an item/thing/frame/object and predicate is a verb.

Both, items and predicates are modular types and each of them may optionally have have dynamic attributes or adverbs.

Impl.: Data Model Example

“Mona Lisa” + was presented [from date to date] at + “the Louvre [website]”.

“Mona Lisa” + was authored [on date] by + “L. da Vinci.”.

Legend:

“subject, object”
+ predicate +
[attribute]

Impl.: References, Edges

Each item in IHM has a canonical resource-URI (aka. UUID) - which can be used to universally reference the content (similar to a permalink).
Edges are directional (parent/child) links between two resource-URIs using a predicate.
A matrix defines the potential relations.

Impl.: Data Types and Relations

http://theartcollider.org/ihm-test/?viz=vis_form_admin_typematrix

Impl.: Technical Specs

PHP/JavaScript/XHTML5, REST-API
Model/View/Controller
OAuth/OpenID for access control and authentication.
Atom/XML is the main data-format for content.
uses existing RDF templates (SOAP, DOAP, FOAF, etc)
modular system: the layout/architecture is defined in the core but the actual visualization, rendering and [interaction + graphic] design is handled by plugins.

Impl.: Data Aggregation

Each object may be aggregated or synchronized with an external resource URI.
Items may reference read-only sources (media archive on disk, 3rd party information) - synchronisation.
Changes to the data-set are published (push) and can be subscribed to. Asynchronous updates.

Prototype: Demo

Site: http://theartcollider.org/ihm-test/

API: http://theartcollider.org/ihm-test/api_rest.php

Prototype: What's missing

Proper front-end (web and interaction design[er])
- Item visualization
- Project specific customizations
Backend-parts:
- Authentication & access-control
- Pub/Sub API
- Query filtering on edges.
- …
Community management

Prototype: Outlook, Roadmap

Publicly usable prototype: after x-mas
Freeze APIs: spring 2012

DokuWiki Slideshow Plugin

Thu, 27 Oct 2011 14:30:00 +0000

This DokuWiki plugin generates an image-gallery/slideshow from pictures in a given namespace.

General Information

View demo: View slide-show

Download

The following link gets the latest version of the plugin and works with DokuWiki's plugin manager: Download

http://rg42.org/gitweb/?p=pixshow.git;a=snapshot;h=release;sf=zip&.zip

Usage Example

The Wiki Syntax

{{pixshow>blog:2011-04-nyc?hidectl&New_York_Visit|view image slide-show of NYC visit}}

creates a link with text “view image slide-show of NYC visit” that leads to a gallery showing images in the name-space blog:2011-04-nyc titled “New York Visit” with the control-panel initially hidden.

Syntax

Note that the pixshow plugin consists of two parts:

An action-plugin which creates the actual slideshow page.
A syntax-plugin to create a link to the gallery from within a wiki page.

{{pixshow>NAMESPACE [?OPTIONS] [|link-text] }}

The default link-text (if none is given) is “View slide-show”.
OPTIONS is a ampersand (&) separated list: noautostart, hidectrl, notitle, TITLE.
The last given non-special option is takes as Gallery-title. If none is given, the namespace-name is used as Gallery-title unless notitle is specified.

About

The pixshow plugin is based on an independent JavaScript web-slideshow ¹⁾ which has been modified to use DokuWiki as data-storage and for caching scaled images…

This plugin is intended for users who keep their images organized (and ordered) with a reasonable amount of pictures per folder/namespace and want to artistically present and share those as image-galleries.

It is not intended for drop-all-images-in-one-folder use-cases. Organization and processing of images is not withing the scope of this plugin.

Features

create slide-show from DokuWiki name-space, link back to DokuWiki pages.
automatic slide-show and manual mode (click on thumbnails)
clean design / auto-hide control-panels - full-screen playback²⁾.
smooth fading transition
user customizable fade and delay times
dokuwiki authentication (read-permission is required to view gallery; upload-permission is needed to edit captions)
JavaScript & XHTML only (no Flash/FLEX)
scale images to browser-window size (binning for width/height values to allow caching of scaled images).
Drag'n'Drop control panel.
Keyboard shortcuts and built-in help.
Gallery-Title
Image-Captions (additional meta-data storage; edit captions directly from gallery)
Link-creation / social-bookmarks for each gallery/name-space.

Caption Admin

If you access the gallery with write-permissions to the namespace, the control panel includes a text-field to edit/update the image-caption.

The text can only be modified while the slideshow is stopped (or in manual mode: click on thumbnail). For convenience and additional navigation buttons is available at the bottom of the page: - from left to right:

Move to previous picture (or wrap around)
show/hide links-popup
open controls-panel and edit caption (auto-stop slide-show)
move to next picture in sequence (or wrap around) - (Note: this button is also replicated at the lower right corner).

The caption-entry field allows UTF-8 text with HTML-entities and very basic HTML (no wiki syntax!). Only .. (bold text), .. (emphasize/italic) and the   (force line-break) HTML tags are accepted. Pressing enter will submit the new text.

The following shortcuts are automatically replaced to HTML-entities:

separators	... - -- () (-)	… − — · •
quotes	,, `` '' << >>	„ “ ” « »
arrows	<- <-> -> <= <=> =>	← ↔ → ⇐ ⇔ ⇒
special glyphs	(C) (TM) (R) (P) (S) (*) < >	© ™ ® ¶ § ♥ < >

Installation Notes

increase your DokuWiki's $conf['cachetime'] so that scaled images remain in the cache for an appropriate time period (1 week to 1 month).
add &cache=purge to the URL in order to purge the internal cache: pixshow caches image-size for each namespace. Uploading or deleting a file from a namespace will automatically flush the cache on operating-systems which support the filemtime system call.
the captions for each image are stored in data/meta/<NAMESPACE>/<IMAGENAME>.pixs.

TODO

parse user-options (~~auto-start, show/hide controls~~, sort-order, etc)
plugin (admin) config options:
- override defaults for user options (auto-start, show/hide control panel/thumbnails) & inverse user-options (noautostart,etc)
- configure style: custom design.css, icons.
- disable features: disable-meta, disable-links, disable-admin-links,…
- allow to disable internal cache feature (depends on filemtime which may not be avail on all OS)
[later] detect browser-window resizing also after the slideshow has started and re-load images.
[later] detect empty folders (in the syntax plugin) and render gallery links as red 'missing page'.
[later] smooth auto-hide transition, fade captions.
additional meta-data (~~EXIF parser, caption,~~ comments, discussion, location, date/time,…)

dokuplugin, floss

¹⁾ I wrote that around 2005

²⁾ if browser supports full-screen mode

Sun, 22 May 2011 17:06:58 +0000

BASEDIR=/home/rgareus/src/svn/jack2mp
killjack.sh; \
LD_LIBRARY_PATH=$BASEDIR/linux:$BASEDIR/common \
JACK_DRIVER_DIR=$BASEDIR/linux \
gdb --args $BASEDIR/dbus/jackdbus auto

Seeing Music - devel

Tue, 08 Feb 2011 13:19:37 +0000

X-Compiling with Minwg

Thu, 08 Jul 2010 13:17:16 +0000

for want of a better place: Here's how I cross-compile *cough* windoof apps on Debian Gnu/Linux:

./configure --host=i586-mingw32msvc --build=i386-linux --prefix=/home/rgareus/.wine/drive_c/x-prefix/

development

JACK2 control

Sun, 06 Jun 2010 23:03:30 +0000

Recent versions of Jack2 aka. jackdmp can be controlled via Dbus and most interestingly, jackdmp allows the backend-driver to be replaced dynamically even while jackd is running!

There's two main use-cases that motivated me:

to be able to quickly switch between the internal and an external soundcard.
to have JACK sessions survive system suspend/resume cycles using the “dummy” driver.

I hardly ever re-boot my laptop and I keep jackd running anytime ¹⁾.

So far I use Qjackctl's Dbus interface to start/stop jackd during suspend; disadvantage is that it terminates all existing jack sessions; it's not a big deal since most apps can simply re-connect but if jackd can be kept running: why not do so?

I did the switch: jackd here is now jackdmp.. while audio-applications are ignorant about the change and everything there works just like it was before with jack1, suspend-resume and qjackctl is now somewhat broken. qjackctl (v0.3.6.22) sometimes gets stuck when switching backends; this is a major bummer since I like it's connection patchbay. patchage (v0.4.4) suffers a similar issue. It does not update the ports correctly. Anyway those problems can be fixed in future releases. But I hit another little snag: Calling jack_control sm - which is needed to switch the backend - drops existing connections to system:* i/o ports. OK. The ports may be different in some setups but they're not here: switching between two stereo cards.

Long story short, here are two shell-scripts. The first to switch between different sound-cards retaining connections. and a secondd to take care of switching to the dummy-driver and back during suspend/resume cycles. They're rather pragmatic hacks, but good enough to get started:

~/bin/myjackctl.sh:

#!/bin/bash
function switch {
  CONNECTIONS=$(jack_lsp -c)
  jack_control sm || exit
  sleep 1
  IFS=$'\n'
  for line in $CONNECTIONS; do
    if [ ${line:0:3} == "   " ]; then
      OUT=${line:3}
    else
      OUT=""
      IN=$line
    fi
    # TODO: only connect system & output ports to avoid dups
    # .. but it does not really matter :)
    if [ -n "$OUT" -a -n "$IN" ]; then
      jack_connect "$IN" "$OUT" &>/dev/null
    fi
  done
}

function start {
  DRIVER=${1-"alsa"}
  DEVICE=${2-"hw:0"}
  PERIOD=${3-"1024"}
  RATE=${4-"48000"}
  NPERIODS=${5-"3"}
  MIDI=${6-"none"}
  jack_control ds "$DRIVER"
  test "$DRIVER" == "dummy" || jack_control dps device "$DEVICE"
  test $RATE -eq 0 || jack_control dps rate $RATE
  test $PERIOD -eq 0 || jack_control dps period $PERIOD
  test $NPERIODS -eq 0 -o "$DRIVER" == "dummy" || jack_control dps nperiods $NPERIODS
  test "$DRIVER" == "dummy" || jack_control dps midi-driver "$MIDI"
  jack_control status || jack_control start
}

start $@
switch

#pidof lashd >/dev/null || lashd &

/etc/pm/sleep.d/90jack2ctl.sh:

#!/bin/bash
case $1 in
  hibernate|suspend)
    pidof jackdbus >/dev/null && \
      su -l rgareus -c "/home/rgareus/bin/myjackctl.sh dummy" >/dev/null
  ;;
  thaw|resume)
    (sleep 4 ;
     /etc/init.d/rtirq start; \
     SNDDEV="hw:0"; grep UA25 /proc/asound/cards >/dev/null && SNDDEV="hw:1";
     pidof jackdbus >/dev/null &&
      su -l rgareus -c "/home/rgareus/bin/myjackctl.sh alsa $SNDDEV" >/dev/null
    )&
  ;;
  *) 
  ;;
esac

jack, development, audio

¹⁾ the only exception is to save power when traveling to places where there's no power-outlet fi. here; since jackd - especially at low latencies - increases power-consumption quite a bit.

Read or add comments to this article

Campcaster Debian Packaging

Thu, 25 Feb 2010 00:45:29 +0000

Robin Gareus

linuxaudio.org
Université Paris

Outline

Requirements
Paths, Locations & persistent storage
Code & Libraries
Licensing Issues
Patches made for the package
proposed future changes

Packaging Requirements

Basics
- install & setup
- remove & keep data & config
- purge → remove all
Debianized Paths
Clean Licenses, as little as possible extra libs
maintainable build/patch-system (quilt, git)

Paths

Original campcaster is setup to work from /opt and the source-tree.

Campcaster's configure & Makefile do not support DESTDIR.
prefix is used to replace paths rather than install-target.

Debian requires installation in /usr

/usr/lib/campcaster - binary arch depenent files
/usr/share/camcaster - arch indep. files (PHP, templates)
/var/[lib]/campcaster - data storage and variable files
/etc/ - configuration, init-scripts, etc

Campcaster problematic libs

Debian does not (usually) allow external libs to be part of a package.

libodbc++
xmlrpc++
taglib
PEAR (security concerns)
libserial (avail upstream)
embedded Smarty

Licensing

Campcaster mixes serveral licenses:

PHP licenses (v2.0, v2.02 & v3.0)
GPL v2/v3
SSL - incompatible with GPL.
test-sounds (was creative-commons)

Packages

Main Target: Ubuntu/Lucid

campcaster-libs - customized libs
campcaster-data - arch-indep files (PHP, images,..)
campcaster-station - executables, server-config
campcaster-studio - GUI binaries

Patches

add debian/ - various scripts & man-pages
use apache Alias instead of symlink in /var/www
Change (hardcoded) paths in shell and install scripts
Add icon in xpm format
Change pgsql setup scripts for debian postgres 8.3/8.4
minor cosmetic changes

Future

Some patches can (and already have been) merged upstream.

Major Upstream ToDo Points:

remove PEAR and rely on available PEAR packages
replace xmlrpc++
option to use system-wide libs instead of provided ones

Nice to have:

flexible install-prefix and install-destination
replace SSL with GNU-TLS (xmlrpc++, curl)

Packaging ToDo:

drop campcaster's postInstallStation.sh script.

it does not conform to debian db/odbc standards

remove NFS auto-detection & provide README to set-up remote storage

building OSX applications

Fri, 05 Feb 2010 20:00:04 +0000

multiple architecture build flags autoconf projects on OSX:

CFLAGS="-arch i386 -arch ppc -arch x86_64" \
CXXFLAGS="-arch i386 -arch ppc -arch x86_64" \
./configure --disable-dependency-tracking

Campcaster 4 Debian & Ubunutu

Tue, 02 Feb 2010 15:59:33 +0000

Notes on packaging Campcaster for Debian & Ubuntu..

campcaster_1.3.0-1.tar.gz

tatort-dl - an ARD-mediathek download utility

Thu, 28 Jan 2010 17:44:55 +0000

tatort-dl is a shell-scripted CLI tool for downloading films from http://www.ardmediathek.de/.

It's named after it's main purpose: to download Tatorts ;) However - as of Jan 25 2010 - it also works with any other content on http://www.ardmediathek.de/.

Please read the license under “help” at ardmediathek.de before using tatort-dl. Some Films or Clips are only available during certain hours and/or time-periods.

Installation and Usage

tatort-rl will work on all systems supporting bash, curl/ and rtmpdump. It's developed for GNU/Linux and may work on OSX and BSD. Download: tatort-dl.sh (latest). Save it as tatort-dl in ~/bin or /usr/local/bin/ and mark it as executable chmod +x tatort-dl. You need to have rtmpdump and curl software installed (sudo apt-get install rtmpdump curl). Usage: tatort-dl <ARDmediathek-URL> [out-file] The default out-file name is ./format<ard-uid>.f4v Example: tatort-dl “http://www.ardmediathek.de/ard/servlet/content/3517136?documentId=3701294” ===== Source Code ===== <code|h view tatort-dl.sh source> extern>http://rg42.org/gitweb/?p=scripts.git;a=blob_plain;f=tatort-dl.sh;hb=HEAD </code>

Qjackctl - DBUS

Sun, 10 Jan 2010 21:10:29 +0000

Since version 0.3.4.11 qjackctl offers DBUS support to start and stop the JACK audio server:

From the change-log:

A couple of primitive D-Bus interface slots have been introduced, giving the option to start/stop the jackd server from the system bus eg. via dbus-send --system / org.rncbc.qjackctl.start (stop), (a nice addition supplied by Robin Gareus, thanks).

The DBUS addition qjackctl is mostly useful for laptops to get JACK back running after a suspend or hibernate cycle.

My motivation was simple: Since skype started working with jackplug in an .asoundrc I missed a couple of calls simply because I forgot to launch jackd after a suspend/resume cycle. I figured that I spend less time hacking an DBUS addition than keep re-starting jackd by hand ;)

Setup

The command-line to launch JACK via qjackctl is

dbus-send --system /org/rncbc/qjackctl org.rncbc.qjackctl.start

On resume you actually want to execute:

(sleep 4 ; dbus-send --system /org/rncbc/qjackctl org.rncbc.qjackctl.start)&

which allows audio-devices to settle (eg USB-soundcards to power up, or ALSA settings to be restored) before restarting JACK.

This command needs to be executed when resuming from standby mode. Depending on your GNU/Linux distribution and suspend-software this can be achieved by

writing a hook script in /etc/pm/sleep.d/

patching /usr/lib/hal/scripts/linux/hal-system-power-suspend-linux

adding a script in /etc/acpi/resume.d/

Resume Script

On Debian/squeeze I use the first option. Don't forget to mark the file executable (chmod +x /etc/pm/sleep.d/90qjackctl.sh ) after creating it.

/etc/pm/sleep.d/90qjackctl.sh

#!/bin/bash case $1 in thaw|resume) (sleep 4 ; dbus-send --system /org/rncbc/qjackctl org.rncbc.qjackctl.start)& ;; *) ;; esac

.asoundrc

For lack of a better place to put it, here's the ~/.asoundrc (or /etc/asound.conf) that I use to run all audio through JACK:

pcm.!default { type plug slave { pcm "jack" } } pcm.jack { type jack playback_ports { 0 system:playback_1 1 system:playback_2 } capture_ports { 0 system:capture_1 1 system:capture_2 } } ctl.mixer0 { type hw card 1 }

audio, jack, documentation, floss

Sat, 09 Jan 2010 19:29:55 +0000

: about text and desc.

http://rg42.org/gitweb/?p=pixshow.git;a=snapshot;h=release;sf=zip&.zip

dokuplugin

Valgrind

Sat, 09 Jan 2010 13:50:04 +0000

Valgrind is an instrumentation framework for building dynamic analysis tools. In other words it allows to check for memory-leaks and profile software applications.

Since reading it's manual page takes a bit to get through here are some command-lines to remember for easy usage.

valgrind --tool=memcheck --leak-check=full --leak-resolution=high --num-callers=50 --show-reachable=yes <program> <args>

development

Formatting Syntax

Thu, 07 Jan 2010 18:44:18 +0000

DokuWiki

Thu, 07 Jan 2010 18:44:18 +0000

Wed, 06 Jan 2010 19:18:02 +0000

fuer Maus:

Open LDAP Server

Tue, 23 Jun 2009 11:27:30 +0000

PC Paralell port

Tue, 23 Jun 2009 11:27:30 +0000

Tue, 23 Jun 2009 11:27:30 +0000

Marzipan Soundtrack

Tue, 23 Jun 2009 11:27:30 +0000

Code Snipplets

Tue, 23 Jun 2009 11:27:30 +0000

X11 VGA to PAL scart

Tue, 23 Jun 2009 11:27:30 +0000

Abc midi tutorial

Tue, 23 Jun 2009 11:27:30 +0000

VGA to SCART

Tue, 23 Jun 2009 11:27:30 +0000

Whois

Tue, 23 Jun 2009 11:27:30 +0000

Debian Sid on the x60s

Tue, 23 Jun 2009 11:27:30 +0000

Tritonus est diabolus in musica.

Tue, 23 Jun 2009 11:27:30 +0000

Agame Stratego

Tue, 23 Jun 2009 11:27:30 +0000

qemu on Debian/sid

Tue, 23 Jun 2009 11:27:30 +0000

Latex Wiki

Tue, 23 Jun 2009 11:27:30 +0000

secure shell stuff

Tue, 23 Jun 2009 11:27:30 +0000

Wiki

Tue, 23 Jun 2009 11:27:30 +0000

PlayGround

Tue, 23 Jun 2009 11:27:30 +0000

Javascript Code

Tue, 23 Jun 2009 11:27:30 +0000

git(1) - the stupid content tracker

Tue, 23 Jun 2009 11:27:30 +0000

Gareus Family

Tue, 23 Jun 2009 11:27:30 +0000

Tue, 23 Jun 2009 11:27:30 +0000

Fink

Tue, 23 Jun 2009 11:27:30 +0000

Arcade

Tue, 23 Jun 2009 11:27:30 +0000

Chess boards

Tue, 23 Jun 2009 11:27:30 +0000

ABC midi

Tue, 23 Jun 2009 11:27:30 +0000

Beatrix - the organ software synthesizer

Wed, 13 May 2009 13:27:40 +0000

http://people.dsv.su.se/~fk/beatrix_home.html

Beatrix is a MIDI-controlled, software synthesizer designed to imitate the sound and properties of the electromechanical organs and sound modification devices that brought world-wide fame to the names and products of Laurens Hammond and Don Leslie.

Disclaimer: beatrix is free (as in beer) - and redistribution if of the software is not permitted. the official license reads:

YOU MAY FREELY DOWNLOAD AND INSTALL A COPY OF THE SOFTWARE FOR YOUR PERSONAL USE. YOU MAY NOT BUNDLE, RENAME, SELL, REDISTRIBUTE, REPACKAGE OR IN ANY OTHER WAY ALTER WHOLE OR PART OF THE SOFTWARE AND ITS DISTRIBUTION WITHOUT PRIOR, EXPRESS AND WRITTEN PERMISSION FROM THE AUTHOR.

The information on this page could be used in license-contradicting ways, however the following instructions are complying the license and do not contain any beatrix related source-code.

About this

While https://sourceforge.net/projects/bristol would be the FLOSS synth of choise, beatrix implemets a great Hammond sound that is worth to pursue coding on. However the last official release v041 of beatrix from November 2004 lacks some essential features for professional use (eg. JACK-audio-interface and MIDI-seqencer).

Jackification

It would not to complicated to wrap beatrix into a jack-audio and alsa-sequencer application without changing any of beatrix' original source!

You would need to add jack-audio client code and wrap the midi-I/O into alsa much like beatrix-v041-jack7u.diff - I also suggest to compile beatrix with the -O3 option (in Makefile) and replace the usage documentation to include the [-R <sample-rate>] optional command line argument (in main.c).

After this small exercise, one would find that some internal buffer-sizes and hardcoded optimizations in beatrix yield to unwanted audio-effects when running at samplerates other than 22050. There are two proposed workarounds: re-sample or change pitch!

With jack at 22050Hz and multiples thereof (eg. 44.1kHz) there are no problems. Running at 48k SPS would need either of those fixes:

./beatrix osc.tuning=404.249986 # internal seq at 22050, tune corrected. # 404.25 = 440 Hz / 24000 * 22050 # internal pitch corrected from 22050 to 24k (*2 to JACK - 48kHz)

./beatrix -R 24001 osc.tuning=440.018333 # internal seq upsampled x2 #(-R 24000 would be correct, but collides with beatrix internals)

./beatrix -R 48001 osc.tuning=440.009179 # natively synth at 48k # Beware: Beatrix ties the effects to sample-buffer size. # Using large sample-rates, it is possible to configure # long reverb and whirl-effect, which may cause internal buffer # overflows.

Comments

Since many synth-internals are hardcoded in beatrix, a rewrite of the engine would be better suited than trying to fix existing code which is not even free. The rewrite could however make use of existing code - given the author consents.

A good alternative Hammond sound can be played with: http://ll-plugins.nongnu.org/azr3/ a JACK port of the AZR3 VST plugin by Rumpelrausch Täips; GPL and everything.

There are also a few CSound instruments available: fi. RotorOrgan or DirectHammond.

OAuth for Dokuwiki

Fri, 13 Mar 2009 14:13:10 +0000

This is the simple version of the dokuoauth plugin.

It implements basic [http://oauth.net|oAuth]] support for DokuWiki using hardcoded tokens instead of the whole oauth-flow. It's mainly intended as example while the dokuoauth plugin is being developed.

The plugin is symmetric: It authenticates OAuth signed requests to dokuwiki as well as adds an oAuth signature to an outgoing request (feed, sync) to hosts for which tokens are defined.

Installation

Install (with plugin-manager): http://rg42.org/gitweb/?p=dokuoauth.git;a=snapshot;h=simple;sf=tgz&.tar.gz

Edit lib/plugins/dokuoauth/tokens.php with an editor.

activate the plugin: Admin → Configuration-editor → DokuoAuth → enable

Configuration

Example tokens.php

// oauth-consumer - outgoing requests - local=consumer $oauth_providers=array( array( 'host' => "localhost", 'user' => "" , # if not empty only this user can use this token 'key' => "ctoken", 'secret' => "csecret", 'token' => "atoken", 'token_secret' => "asecret" , 'signature_method' => 'HMAC-SHA1' ), ); // Oauth service provider - incoming requests - local=serviceprovider $oauth_tokens=array( array( 'key' => "ctoken", 'secret' => "csecret", 'token' => "atoken", 'token_secret' => "asecret" , 'user' => "me" # authenticate this user ), array( 'key' => "ct", 'secret' => "cs", 'token' => "at", 'token_secret' => "as" , 'user' => "admin" # authenticate this user ), );

The $oauth_providers is used for transparently OAuth signing outgoing requests. The Plugins intercepts requests via devel:event:httpclient_request_send, if the hostname matches 'host' and the current (local) user matches the given 'user'.

$oauth_tokens are for incoming requests with an oauth_signature query parameter. If the tokens match and the signature is valid, the given 'user' is automatically logged in for this request. It works for any HTTP request, though it's mainly intended for XMLRPC.

There can be multiple $oauth_providers (for differnt hosts and users) as well as $oauth_tokens (different users).

Examples and Testing

from dokuwiki

Add a feed to a private namespace to a wiki-page. The outgoing request (to retrieve the feed) will be signed, and the signature will be used to authenticate against DokuWiki again.

{{rss http://localhost/dokuwiki/feed.php?mode=list&ns=private}}

Make sure that the tokens.php on the server lists the host (here localhost) in $oauth_providers and the feed-source has the same tokens and a username that can read the private-namespace in $oauth_tokens.

from the commandline

use oauthsign from oauth-utils.

oauthsign -c ctoken -C csecret -t atoken -T asecret -x "http://localhost/dokuwiki/feed.php?mode=list&ns=private"

debugging

Enable debug Logging (Admin → Configuration-editor → DokuoAuth) and look in the file /tmp/oAuth.debug.

dokuplugin, floss, www

InOut

Fri, 20 Feb 2009 15:07:05 +0000

..work in progress..

Interaction Concept

Flow for InOut Collab.

Create Account (once)

agree to CC-SA

choose username & pass; request a secutity token

Choose Interaction Mode (for each session)

simple - webcam, browser, file-upload

normal:

relay - DSL, low bandwidth, firewalled users

p2p - requires IP, direct access to icecast & OSC ports

Connect A/V streams

create OUT-port (provide hashed security-token and/or register on server)

announce public OSC commands/modifiers for this OUT port (via XMPP)

retrieve a list of available OUT-ports (from others), that can be used as IN

Brainstorm

Use XMPP for join/leave the network (alike jabber chat) and feedback (xmpp group chat)

unique ID for all ports.

use OSC for real-time control messages (client specific)

provide a minimal set of OSC for simple mode eg. zoom, seek, effect settings

provide a XHTML <video/> interface to monitor/select active streams

media-browser for available files in the pool

simple-mode:

server-side A/V creation tools (OSC-in; A/V out)

server-side filters (OSC controlled)

development, installation

Collaborative Video Editing

Fri, 16 Jan 2009 03:37:54 +0000

Links & Resources

http://www.syncvue.com/

http://corp.kaltura.com/

http://www.masternewmedia.org/news/2006/04/21/grassroots_collaborative_online_video_editing.htm

http://metavid.org/wiki/Help:Installation

DokuWiki LADSPA plugin

Thu, 01 Jan 2009 14:38:33 +0000

Work in progres

Visualizes LADSPA plugins and allows to demonstrate audio effect-presets in a wiki ~~page~~ story.

see git repository for now.

floss, www, dokuplugin

DokuWiki Tag Entry Plugin

Wed, 31 Dec 2008 15:55:24 +0000

Dokuwiki Tag Entry Plugin

This dokuwiki plugin provides functionality to assign tags to a wiki-page.
Work in Progress

The tagentry plugin displays a set of tag-name checkboxes just below the edit form and automatically modifies the content of the wiki-text entry-area using javascript once the checkbox is activated. It requires the tag and plugin:pagelist plugins. Per default it lists pages below tag: as tag-names.

download latest version (use this link with the Plugin Manager).

view devel repository.

ToDo:

move render functions to helper

improve tag listing

pages that exist in namespace $conf['plugin']['tag']['namespace'];

all available tags

order by importance or use-count and limit the max number of displayed tags

Time Based Text

Mon, 22 Dec 2008 14:11:30 +0000

Dokuwiki plugin for time based text.

download

FLOSS Lighting

Wed, 17 Dec 2008 17:42:34 +0000

http://llg.cubic.org/links.html

DMX 4 Linux

http://sourceforge.net/projects/qlc/

linuxfilm.org

Sun, 14 Dec 2008 17:28:05 +0000

A collection of links to articles to start brainstorming about linuxfilm, linuxAV and libreAV:

http://www.linuxjournal.com/article/8589 (Nov 2005)

http://www.linuxjournal.com/article/5817 (may 2002)

http://www.linux.com/feature/60624 (march 2007)

http://www.linuxmovies.org/software.html (2005)

http://www.linuxmovies.org/

http://en.wikibooks.org/wiki/Movie_Making_Manual-Linux_in_film_production

http://dreamlinuxforums.org/index.php?board=50.0

http://loll.sourceforge.net/linux/links/Audio-Video/Video/ (lots of links)

http://www.linux.com/articles/60970

http://en.wikiversity.org/wiki/Topic:Film_production

http://www.dvguru.com/2006/10/05/fonts-and-resources-to-spruce-up-your-film-or-dvd/

http://www.filmeditings.com/linux-video-editing-software.php

http://cuisine.bigasterisk.com/

http://lumiera.org/

http://cinelerra.org/

http://groups.google.com/group/open-source-video-editing-foundation/about

http://www.kinodv.org/

http://gmerlin.sourceforge.net/

http://openmovieeditor.org/

http://ubuntustudio.org/

http://www.cinepaint.org/

http://www.pitivi.org/wiki/Main_Page

Fri, 24 Oct 2008 13:46:58 +0000

soon to come - stripped down dokupubsub plugin. makes (oauth signed) wiki2 XML-RPC requests to distribute dokuwiki page edits.

see git repository

dokuwiki OAuth tests and examples

Sun, 19 Oct 2008 13:49:58 +0000

You can access the dokuwiki OAuth API by making requests to doku.php?do[oauth]=XXX or simply by making any request adding the oauth_signature request-parameter.

get liboauth and oauth-utils.

curl "http://example.org/doku.php?do\[oauth\]=addconsumer&consumer_key=key&consumer_secret=secret" oauthsign -x "http://example.org/doku.php?do=admin" key secret accesskey accesssecret

Here's a script that walks through the complete oAuth Core 1.0 protocol:

DW="http://localhost/robwiki/" DWOA="${DW}?do[oauth]=" DWRPC="${DW}lib/exe/xmlrpc.php" CK="key" CS="secret" CU="" TOKENFILE=`mktemp /tmp/oauth.XXXXXXXXXX` || exit 1 function cleanup { rm $TOKENFILE; } trap cleanup EXIT echo " +++ add consumer." curl "${DW}?do\[oauth\]=addconsumer&consumer_key=${CK}&consumer_secret=${CS}&callback_uri=${CU}" echo " +++ getting request token.." $OAUTHSIGN -X -f $TOKENFILE -w -e "${DWOA}requesttoken" "$CK" "$CS" \ || (echo " !!! no request token returned."; exit 1) || exit 1; echo " +++ Authorization." REQTOK=`cat $TOKENFILE | awk '/oauth_token_key=(.*)/{ print substr($1,17);}'` echo "visit ${DWOA}authorize&oauth_token=${REQTOK}" echo -n "to authorize this request token and press enter.." read echo " +++ exchanging request token for access token" $OAUTHSIGN -X -f $TOKENFILE -w "${DWOA}accesstoken" \ || (echo " !!! token exchange failed"; exit 1) || exit 1; echo " +++ making test request.." $OAUTHSIGN -x -f $TOKENFILE "${DW}?do=admin" \ | grep "Logged in as:" # || echo " !!! test request failed" echo " +++ performing XML-RPC.." curl --data-ascii @- -H "Content-Type: text/xml" \ `oauthsign -p -G -f $TOKENFILE ${DWRPC}` \ << EOF <?xml version="1.0" encoding="iso-8859-1"?> <methodCall> <methodName>wiki.getPageInfo</methodName> <params> <param> <value> <string>wiki:start</string> </value> </param> </params> </methodCall> EOF

Note: Apache rewrite-rules modify the base-string! - this is to be fixed or worked-around. So far query-parameter and URL must not be modified before they're passed to the PHP script (Using DirectoryIndex doku.php works, redirecting from index.php does not!) - This is a minor issue since in general oAuth requests always use a full absolute URL ending with /doku.php (or /lib/lib/exe/xmlrpc.php) to access the dokuwiki API.

old Test & Examples

get liboauth and oauthsign:

curl -v "$(./oauthsign GET "http://localhost/dokuwiki/doku.php?do=admin&id=start" key accesskey secret accesssecret )" 2>&1 | less

To invoke oAuth API callbacks start with:

curl "http://localhost/robwiki/doku.php?do\[oauth\]=token&oauth_version=1.0&oauth_nonce=123456789affeb00b&oauth_timestamp=1234567890&oauth_consumer_key=key&oauth_signature_method=HMAC-SHA1&oauth_signature=2U6rOwNhH%2FE25%2FniBor%2B6Zz4TwQ%3D"

$ curl -v "$(./oauthsign GET 'http://localhost/robwiki/?do[oauth]=token' key accesskey secret accesssecret )" 2>&1 | less # $ ./oauthsign GET 'http://localhost/robwiki/?do[oauth]=token' key accesskey secret accesssecret http://localhost/robwiki/?do%5Boauth%5D=token&oauth_consumer_key=key&oauth_nonce=RY4ZHtOrlztZRBpn9LEjIli1Ae4&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1223642226&oauth_token=accesskey&oauth_version=1.0&oauth_signature=Cd89NAcMebpJFvlDh3YvgNEZe4g%3D

Test-script:

#!/bin/sh CONKEY="key" CONSEC="secret" DOKUURL="http://localhost/robwiki/" echo "CONSUMER: key=$CONKEY sec=$CONSEC" ################# # get request-key URL=$(oauthsign GET "${DOKUURL}?do=requesttoken" $CONKEY "" $CONSEC "" ) RV=$(curl "$URL") REQKEY=$(echo "$RV" | awk -F '&' '/oauth_token=(.*)/{ print substr($1,13);}') REQSEC=$(echo "$RV" | awk -F '&' '/oauth_token_secret=/{ print substr($2,20);}') #REQKEY="requestkey" #REQSEC="requestsecret" echo "REQUEST: key=$REQKEY sec=$REQSEC" echo " ---- " ################## # get access-token URL=$(oauthsign GET "${DOKUURL}?do=accesstoken" $CONKEY $REQKEY $CONSEC $REQSEC) RV=$(curl "$URL") ACCKEY=$(echo "$RV" | awk -F '&' '/oauth_token=(.*)/{ print substr($1,13);}') ACCSEC=$(echo "$RV" | awk -F '&' '/oauth_token_secret=/{ print substr($2,20);}') echo "ACCESS: key=$ACCKEY sec=$ACCSEC" echo " ---- " #ACCKEY="accesskey" #ACCSEC="accesssecret" ############## # make request URL=$(oauthsign GET "${DOKUURL}?do=admin" $CONKEY $ACCKEY $CONSEC $ACCSEC) curl "$URL"

OAuth for Dokuwiki

Fri, 10 Oct 2008 12:12:03 +0000

Towards oAuth support for dokuwiki.

Code

patch dokuwiki's inc/auth.php to provide a trigger that allows to hook into the authentication mechanism.

--- a/inc/auth.php +++ b/inc/auth.php @@ -72,7 +72,13 @@ // external trust mechanism in place $auth->trustExternal($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']); }else{ - auth_login($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']); + $evt = new Doku_Event('ACTION_ON_AUTH',$ACT); + $evt->advise_before(); + if(empty($_SERVER['REMOTE_USER'])) { + auth_login($_REQUEST['u'],$_REQUEST['p'],$_REQUEST['r']); + } + $evt->advise_after(); + unset($evt); } }

use an action-plugin to provide authentication on a per HTTP-request basis:

if(!defined('DOKU_INC')) die(); class action_plugin_oauth extends DokuWiki_Action_Plugin { function register(&$contr){ $contr->register_hook('ACTION_ON_AUTH', 'BEFORE', $this, 'handle_act_authhook'); $contr->register_hook('ACTION_ACT_PREPROCESS', 'BEFORE', $this, 'handle_act_preprocess'); } function handle_act_authhook(&$event, $param){ if (!empty($_REQUEST['oauth_signature'])) { // verify signature // check consumer and access token // -> set username for this session // http://oauth.googlecode.com/svn/code/php/ require_once("dokuoauth.php"); try { $req = OAuthRequest::from_request(); list($consumer, $token) = $doku_server->verify_request($req); } catch (OAuthException $e) { print($e->getMessage() . "\n<hr />\n"); print_r($req); die(); // XXX } // dokuwiki - set user $user='root'; $_SERVER['REMOTE_USER'] = $user; global $USERINFO; global $auth; $USERINFO = $auth->getUserData($user); } } function handle_act_preprocess(&$event, $param){ $handled=false; if (!empty($event->data['oauth'])) { // ... // token-exchange, admin, etc. // } if ($handled) { $event->stopPropagation(); $event->preventDefault(); } } } //Setup VIM: ex: et sw=4 ts=4 enc=utf-8 :

work in progress

Discussion

adding the ACTION_ON_AUTH event to existing events does not seem to be too far out; however it raises the following concerns:

makes it easier to write a exploit-plugin

may slow down the system - the Auth plugin is called for each request!

it's somewhat parallel to inc/auth/*.php structure.

The first is not really true, any plugin can used to perform malicious actions; it's just that ACTION_ON_AUTH should never be used carelessly which ties into the second issue: pay strict attention to optimize performance of the callback handler - On a wiki with ACLs it will be called for each request!

Which is also what makes it different from inc/auth/ authentication mechanisms… more on that later.. I'm going to ask on the dokuwiki mailing list..

SOAP

Tue, 07 Oct 2008 20:42:36 +0000

Client

use warnings; use strict; use SOAP::Lite; use Getopt::Long; use Data::Dumper; my $opt = {}; GetOptions($opt, 'server=s', 'command=s', 'urn=s', ); my $NS = "urn:". ($opt->{urn} || "SOAPServer::Handler"); my $HOST = 'http://'.$opt->{server}; my $soap = SOAP::Lite ->readable(1) ->uri($NS) ->proxy($HOST); my $soapd = new SOAP::Data->type(hash => $opt); my $som = $soap->command($soapd); print Dumper $som->result;

Server

apache config

Listen 8088 <VirtualHost _default_:8088> DocuemtRoot /var/www/ ServerName soap ErrorLog /var/log/apache2/soap_error.log TransferLog /var/log/apache2/soap_transfer.log <Location /soap> SetHandler perl-script PerlHandler Apache2::SOAP PerlSetVar dispatch_to SOAPServer::Handler </Location> </VirtualHost>

handler script

package SOAPServer::Handler; use SOAP::Lite; sub command { my ($class, $soap_hash) = @_; $data = SOAP::Data->new; $data->type(hash => {result => 'hiho'}); print STDERR "huhu\n"; return $data; } 1;

Dokuwiki XML RPC

Mon, 25 Aug 2008 17:28:19 +0000

dokuwiki supports |WikiRPCInterface2 Remote Procedure Calls (RPC), speaking the Extensible Markup Language (XML). see: dokwiki XMLRPC.

As heavy dokuwiki user I am interested to make use of this interface for various purposes. Here's some basics: a “hello world, what's your Dokuwiki version number?” example in PHP.

<?php $host="example.org"; $dokuwikipath="/"; $dw_user=NULL; $dw_pass=NULL; $req = xmlrpc_encode_request("dokuwiki.getVersion", array()); $res= dokuXmlRpc($req); print_r($res); ######################################################################## # XML-RPC # see http://php.net/manual/en/ref.xmlrpc.php ## function dokuXmlRpc($request) { global $host, $dokuwikipath, $dw_user, $dw_pass; $x = dokuPost($host, $dokuwikipath, $request, 0, $user, $pass); $response = xmlrpc_decode($x); if (xmlrpc_is_fault($response)) { trigger_error("xmlrpc: $response[faultString] ($response[faultCode])"); } return($response); } function dokuPost($host, $dokuwikipath, $data_to_send, $headers=0, $user=NULL, $pass=NULL) { $fp = fsockopen('ssl://'.$host, 443); if (!$fp) { trigger_error("dokuXmlRpc: can not connect to server."); return NULL; } $path=$dokuwikipath.'lib/exe/xmlrpc.php?'; if ($user) $path.='user='.urlencode($user).'&'; if ($pass) $path.='pass='.urlencode($pass).'&'; $path=preg_replace('![?&]$!', '', $path); fputs($fp, "POST $path HTTP/1.1\r\n"); fputs($fp, "Host: $host\r\n"); fputs($fp, "Content-type: text/xml\r\n"); fputs($fp, "Content-length: ". strlen($data_to_send) ."\r\n"); fputs($fp, "Connection: close\r\n\r\n"); fputs($fp, $data_to_send); while(!feof($fp)) { $res .= fgets($fp, 128); } fclose($fp); if (!$headers) { $res=preg_replace("/^.*\r\n\r\n/s",'',$res); } return $res; }

DokuWiki Publish/Subscribe

Thu, 21 Aug 2008 20:11:32 +0000

dokuwiki Publish/Subscribe

Ideas on Server to Server communication to synchronize dokuwiki content.

About

Motivations ranges from adding features as dokuwiki mirror, backup and decentralized load-balancing solutions to semantic web communication and data-portability.

Kludge solutions (like dokursync) work fine for smaller sites but there's need for improvement on scalability and offering web-standards.

Outline

http://OAuth.net & http://openID.org

RPC

XMPP & Atom

I envisage a subscription and publication plugin for dokuwiki, making use of existing infrastructure (eg. Atom and raw data export). A mechanism to distribute locks may be included in either or will be implemented as a optional standalone plugin.

Current ideas include using a XMPP ↔ HTTP gateway and or the WikiRPCInterface2. Then again, using a custom RPC notification to distribute edit-locks would be easier to maintain, setup and may have lower latency, but lacks interoperability.

The intention is to minimize dokuwiki changes, and also keep the dokuwiki plugins rather simple. re-use existing frameworks and protocols.

Ideas

The preferred mechanism would be to implement Jabber XMPP Publish-Subscribe extension in conjunction with a XMPP → RPC gatewaty.

Having dokuwiki publish news is a minor task; email-subscription is already possible. Formatting it in XML or Atom and signing the change is straight-forward; wrapping and sending it to a gateway also easy.

Acting upon subscriptions is a bit trickier. It's feasible to just generate an automatic edit request via HTTP-POST for each incoming XMPP news. This could be built-in or happen at a gateway; with design depending on implementation: Authentication could happen internally (dokuwiki signs data-changeset), as part of the protocol (oAuth) or via transport (HTTPS). the choice depends on the use-case and application: user-administrated vs. admin-maintained or low-traffic-decentraliced-wiki vs. mirror/load-balancing.

options:

dokuwiki provides OAuth for setUID-requests - normal do=save POST requests can be used to perform updates. (oAuth-tokens are tunneled with XMPP-message/request to any gateway - openID can be used as remote user-account)

whitelist/blacklist approach: local xmpp gateway filters and performs wiki updates (write files or hardcoded-auth POST)

custom dokuwiki shared-Auth mechanism.

(1) is the most flexible and cool, alas also the most complex choice. (2) is pragmatic and probably fast (good performance and short implementation-time) wheres (3) may offer more advanced SPAM protection, user configuration and mapping and as well be on the way to provide a lock mechanism.

PubSub does not strictly address locking. A solution would be to publish an “invalidated” version of a page when beginning to edit and re-publish afterwards. It would either require very short draft-timeout times or dokuwiki would need send AJAX requests on cancel edit and re-publish.

Storm

http://wokkel.ik.nu/

http://idavoll.ik.nu

http://www.dokuwiki.org/devel:xmlrpc

http://www.jspwiki.org/wiki/WikiRPCInterface2

http://www.mediamatic.net/page/26605/en

http://www.mediamatic.net/module/PubSub/

wokkel implements a HTTP ↔ XMPP gatway that distributing Atom feeds along with an authoritative resource URI. It's intended to run on a host reachable by the web-server (localhost, or in DMZ); the XMPP port is open to public (it's a jabber server) while the HTTP has a whitelist IP filter.

idavoll/wokkel HTTP command summary:

create XMPP node ID

publish content to XMPP node ID (sends out xmpp messages)

subscribe to node (will generate a HTTP POST to a given address for an incoming XMPP message)

unsubscribe from node id

see http://idavoll.ik.nu/wiki/HTTP_Interface and http://idavoll.ik.nu/wiki/HTTP_Interface_Subscription After publication the XMPP-node ID should be included in the xhtml header to provide subscription discovery.

Dokuwiki & rsync

Thu, 21 Aug 2008 18:24:56 +0000

A method to synchronize two dokuwiki installations.

About

The idea is simple: For each wiki-write-transaction a small dokuwiki action plugin launches rsync to publish/update the underlying data storage.

Synchronization happens in the background: a small perl script prevents multiple simultaneous rsync processes and re-runs if changes occur during an active transfer.

Notes

While rsync is capable of bi-directionally synchronizing multiple wikis. The script below is in use on a (read/write) master to (mostly read-only) slave wiki. Use rsync's -u option, but with care: page-locks, and edit-drafts are not distributed. - While suitable for a small group of editors, race-conditions may occur on larger public wikis.

One workaround is to make a receiving namespace read-only; optionally in combination with the include plugin to make parts locally writable content.

Alternatively one can make use of redirecting or proxying write-requests (HTTP-POSTs in general) to the central master. There can be different master servers per namespace; but depends on secure cross-site requests and authentication token passing.

Last but not least NFS-sharing the data/lock folder may be an option. see dokupubsub

Source

<?php /** * @license GPL 2 (http://www.gnu.org/licenses/gpl.html) * @author Robin Gareus <robin@gareus.org> */ // must be run within Dokuwiki if(!defined('DOKU_INC')) die(); if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/'); require_once (DOKU_PLUGIN.'action.php'); class action_plugin_rsync extends DokuWiki_Action_Plugin { function getInfo(){ return array( 'author' => 'Robin Gareus', 'email' => 'robin@gareus.org', 'date' => '2007-05-23', 'name' => 'rsync plugin', 'desc' => 'rsync dokuwiki data', 'url' => '', ); } function register(&$contr){ $contr->register_hook('IO_WIKIPAGE_WRITE', 'AFTER', $this, 'handle_wikipage_write', array()); } function handle_wikipage_write(&$event, $param) { global $conf; // if an old revision is saved or the file is empty -> run away if ( ($event->data[3]) || (!$event->data[0][1]) ) return false; //$ns=$event->data[1]; //$path=$event->data[0][0]; system ("/usr/local/bin/dokusync.pl &>/tmp/rwikisync.log &"); return true; } }

The Perl script to rsync the actual data. Save as /usr/local/bin/dokusync.pl or change the path in the above plugin code accordingly.

#!/usr/bin/perl ### CONFIG $rsyncopts="-azv --delete --no-o --no-g --chmod=Dg+wx,ug+rw"; $myssh="ssh -i /var/opt/id_rsa -l username"; @excludelist = ( "_darcs", "cache/", "attic/", "private/", "index/" ); $src="/var/www/data/"; $dstpath="/site/docroot/data/"; $dsthost="example.org"; $dst=$dsthost.":".$dstpath; ###prevent multiple instances use File::Pid; $pidfile = File::Pid->new({ file => "/var/lock/rwikisync.pid"}); if ( my $num = $pidfile->running ) { # touch restart-file system("touch /var/lock/rsyncrestart"); die "Already running: $num - restart scheduled\n"; } $pidfile->write; ### build commandline $command="rsync ".$rsyncopts." -e \"".$myssh."\" "; foreach (@excludelist) { $command.=" --exclude '".$_."'"; } $command.=" ".$src." ".$dst; ### and execute it.. system("date"); system($command); ### fix group permissions system($myssh." ".$dsthost." \"chgrp -R www-data ".$dstpath." 2>/dev/null\""); # check if restart was attempted -> rm restart file and rsync again.. while ( -e "/var/lock/rsyncrestart" ) { unlink "/var/lock/rsyncrestart"; system($command); } $pidfile->remove;

Image Compositor Socket

Mon, 21 Jul 2008 14:38:31 +0000

ardour - the new digital audio workstation - includes rudimentary support to display video-timelines. - For this to work the video-data needs to be supplied by a 3rd-party application via TCP-socket, hence the name: Image Compositor Socket.

Back in 2004/2005 aniComp from the CMT, Glasgow Animatics-server was supported in Ardour-0.99; but since then ardour-2.X ICS code has been mostly unmaintained.

I took to code a video-server that implements the ICS protocol and this wiki page collects related information concerning ardour.

ICS and ardour 2.X

ardour-0.99.3 works /just fine/. However the 2.0-ongoing branch (currently ardour-2.5, svn rev. 3617) requires patching some regressions of the video-display.

You can grab split-patches and follow discussion at http://tracker.ardour.org/ or download a combined patch based on the git:/ /mir.dnsalias.com/ardour2 ics branch

Setup

ardour enables it's video-capabilities if it can find an executable aniComp in $PATH. probably the easiest way to accoplish this is to

sudo ln -s /bin/true /usr/local/bin/aniComp

ardour2 will also need the an additional line in the ardour.menus configuration file:

<menuitem action='aniConnect'/>

I've added it below the “AddTrackBus” entry.

Launch the socket-server, ardour and activate ardour's “connect” menu-entry.

ICS Protocol

ICS uses TCP port 30000. the general syntax is in ASCII text: Every message but the raw-video-data is encoded as Text, integers are represented as decimal values.

NUMBER := <ascii-decimal-integer (3 or 10bytes)> TEXT := <length (3bytes)><data (length bytes)> REPLY := "RT0" | "RT1" COMMAND := <2-byte-command> [2-byte-id]* [TEXT]* [NUMBER]*

there are various 2-byte identifiers for commands, items and attributes (eg. IN: insert, RM: remove, IT: imageframe time axis etc). for a full list see the ardour source:

gtk2_ardour/ardour_image_compositor_socket.h gtk2_ardour/imageframe_socket_handler.cc gtk2_ardour/imageframe_socket_handler.h

If you don't have aniComp and can't wait until sodankyla is deployable, you can connect to ardour using the gnu-tool socket. Here's an annotated example session:

# # $ socket -v -ls 30000 # # load session SAOS019/tmp/a25/a25.ardour # # create new video-track "TTTT" INIT004TTTT # rename "TTTT" to "NAME" MVIT004TTTT004NAME # insert a new marker-track (just testing) INMT005VNAME004NAME # add a new video-scene/group to the video-track INIG004NAME007myscene # add an image to the video-scene INII004NAME007myscene004myID00000000000000000000 # # ardour asks: # # "RQID004NAME007myscene004myID066" # | + | + | + | # | | | preferred height # Track Scene Chunk # # # reply - header # Width # | Height # | | SPP # | | | Data len # | | | | RDID00800600300000000000000000000000000000144 # expect "RT1" from ardour. # now send image data - here: 144 bytes 000...000 (repeat)

Note: ardour-0.99.3 expects SPP=4 and RGBA image data. The patched ardour2 can handle RGB24 and RGBA32.

external resources

http://subversion.ardour.org/svn/ardour2/branches/2.0-ongoing/gtk2_ardour/ardour_image_compositor_socket.h

http://animix.sourceforge.net/anicomp/images/anicomp_preview_2.png

http://sourceforge.net/projects/animix/

Dokubookmark - Website Tagger

Fri, 04 Jul 2008 00:31:35 +0000

Bookmark Wiki

Inspired by the Dokuwiki-Weblog Bookmarklet hack. Here's a safer method to safe bookmarks in dokuwiki.

see bookmarklets for a method that does not require additional PHP code.

Bookmarklet

Add a new bookmark in your browser with the text below. Edit it to match the hostname and protocol to match your dokuwiki server.

javascript:Q=document.selection?document.selection.createRange().text:document.getSelection(); void(window.open('https://your.hostname/dwlog.php?te='+escape(Q)+'&ur='+ escape(location.href)+'&ti='+escape(document.title),'dokuwikiadd','scrollbars=yes,resizable=yes,toolbars=yes,width=600,height=300,left=200,top=200,status=yes'));

Source

..work in progress..

The script offers two methods:

directly redirect to dokuwiki edit/preview form.

intermediate page (allows to change page-name)

The first can also be archived directly with a bookmarklet, which is however not compatible with all browsers.. - this first method is basically the same javascript but read from the server instead of the browser's bookmark.

The 2nd Method provides more elaborate interaction. This code adds a checkable list of tags and allows to change the page-name or namespace, before going into preview-edit mode.

Bookmarklets

Thu, 03 Jul 2008 01:13:14 +0000

Dokuwiki Bookmark Log

Inspired by the Dokuwiki-Weblog Bookmarklet hack. Here's a safer method to safe bookmarks in dokuwiki.

Bookmarklet

Add a new bookmark in your browser with the text below. Edit it to match the hostname and protocol (http, https) of your dokuwiki server.

javascript:Q=document.selection?document.selection.createRange().text:document.getSelection(); void(window.open('https://your.hostname/dwlog.php?te='+escape(Q)+'&ur='+ escape(location.href)+'&ti='+escape(document.title),'dokuwikiadd','scrollbars=yes,resizable=yes,toolbars=yes,width=600,height=300,left=200,top=200,status=yes'));

Source

Ideas/ToDo

show [common] tags as checkboxes

skip one step (Location: redirect to edit/preview page, doku _template)

check dokuwiki auth, sectok

getting things done

Mon, 30 Jun 2008 01:41:02 +0000

Dokuwiki's ToDo list - won't get things done faster, but maybe with less latency. Has to compete with trac+git ;)

Example:

<gtd [warn=dd] [due=dd]> [#] [@context] [p:project] [d:yyyy-mm-dd|mm-dd|dd] [w:dd] [describing text] [#] [@context] [p:project] [d:yyyy-mm-dd|mm-dd|dd] [w:dd] [describing text] </gtd>

[warn=dd] set a global warning period in days before the task has to be finished, the item changes its' color to orange optional (defaults to 5)

[due=dd] set a global due to period in days before the task has to be finished, the item changes its' color to red optional (defaults to 2)

[#] A leading '#' marks a Todo as done optional

[@context] The context of the Todo ( _ will be transformed to space ). required

[p:project] Specifies if a todo item belongs to a certain project ( _ will be transformed to space ). optional

[w:dd] overwrite global warning period by days optional

[d:yyyy-mm-dd] The date until when the task should be done, if you use mm-dd the year will be appended automatically, same if you only use dd the month and the year will be appended automatically optional

[describing text] Describing text. Must be on a new (one linebreak) line (Wiki Syntax can be used to format). required

<gtd warn=3 due=1>

@mycontext p:example d:2008-05-29 describing text of a task

@mycontext p:example d:15 w:20 describing text of some due task that has to be done this month

@mycontext p:example d:30 w:10 another describing text of a monthly task

@mycontext p:enhancements d:2020-01-01 this task is not due in the near future

@mycontext p:enhancements d:2008-07-19 w:50 ..to be done mid July.. </gtd>

scratch

Goban

Tue, 29 Apr 2008 08:30:09 +0000

link collection

http://gtl.xmp.net/

http://www.european-go.org/rating/gor.html

http://stason.org/TULARC/games/go/

http://www.goproblems.com/

the Frontera Project

Wed, 16 Apr 2008 15:05:38 +0000

Outline and Resource Collection for the Frontera Project

* http://frontera.sf.net

Camera

* http://wiki.elphel.com/index.php?title=Camera_software * testOnDemandRTSPServer in package livemedia-utils

Viber - the video monitor

Sun, 30 Mar 2008 11:43:53 +0000

Viber - video monitoring software

scratches on newspaper margins:

Design

Thread model

There can be multiple display (one for each window), and decoder (one for each file) threads. However there is only one master sync source (thread) at a given time. How this sync source affects the different tracks is specified by the session which can include a per track transport which can be derived from the master in arbitrary ways.

The buffer thread needs to ensure that the cache will contain the data that the video-display thread will need in the near future.

There is one buffer thread that spawns decoders in the background (the decoders should finish their work before the display thread comes along). The buffer-thread is mainly concerned with latency compensation, and generates a map of video-frames to timecode<footnote>The underlying decoder→framecache may perform additional transformations in the timecode (eg. EDL)</footnote>.

The buffer thread has different modes of operation:

still picture

play (readahead, compensate latency)

The play-mode should recognize varispeed or backwards playback..

The buffer-thread needs not to be a thread but can be a callback from the sync-source<footnote>In principle the buffer-function can be run periodically from jack_process callback. But this is not practical since it can be up to a hundred ms latency: 4096/44100</footnote>. Theres more to be said about this.

Video Display Thread

This thread only flips buffers and stores a timestamp along with the screen's retrace count, at a freq between 25..120Hz.

It synchronizes to DRI vblank (wait for interrupt - GLXWaitVideoSyncSGI or directly DRM_IOCTL_WAIT_VBLANK, DRM_VBLANK_RELATIVE) ; if unavailable these could be substituted by a RTC, HPET device sync or a realtime thread (jack_client_create_thread(..))

Note: to prevent async_x_replies; this thread should wake up the UI interaction Thread for calling XFlush() as to prevent async-X11-replies. ToDo: check for fallback: what if there's no VGA ;) ToDo: figure out the latency of XvShmPutImage() relative to the retrace count.

UI interaction Thread or Callbacks

handles XPending() events.

process remote-control cmds (MIDI?, OSC, stdio,..)

modify (load/save) session

Sync Source Thread or Callbacks

provide a clock source. linking this to audio hardware: the thread would in intervals around 50Hz (48k/1024 or 192k/4096) but that may vary from 1Hz (8k/8192) up to 6kHz (192k/32).

thread plugins

dummy - fixed frame

jack_transport

jack freewheeling ?!) skip video frames for as fast as possible audio (video progress monitor)- as fast as possible video makes no sense

amidi_seq thread (MTC)

callback plugins - wake up

jack_audio (LTC)

jack_audio (debug; scope - connect to VGA luminosity)

jack_midi (MTC)

Decoder, Buffer Thread(s)

simplified API:

openFile(path|streamURL?) *getFileInfo(VC, ..)- returns possible data formats, framerate, time offset, etc. *SetRenderFormatandSize(dataformat, size)*SetDecoderParams(seekparams)*storeFrameandInfo(timecode, *data)'';

The buffer thread links them all together.

VideoDB

Mon, 28 Jan 2008 17:11:58 +0000

Simulating Analog Audio Cicuits

Tue, 29 May 2007 02:43:00 +0000

Idea: feed the great SPICE simulator with audio-data.

Solution: add a libsndfile voltage-source to SPICE ;)

general information

It's yet a quick experiment, and requires patching the SPICE source-code. Initial tests show that it might be realistic to simulate simple schematics in real-time¹⁾. Although the spice command is already named jack it's yet only a file-reader. For testing, there is a tool txt2snd to convert spice .print lines into wav²⁾ files.

one (of the many) problem is running spice in audio-samplerate time-steps… - it's work in progres.

prepare

patch spice: ng-spice-rework-17-sndfile.diff

compile txt2snd-0.1.tgz

prepare some libsndfile readable audio file.

spice syntax

The patched spice knows a new type of voltags-source jack with the optional argument file.

an example netlist entry - here: connecting the sound-source /tmp/test.wav to pin 4(Signal) and pin 0 (GND) with a range of [-1..+1] Volts.

V_V2 4 0 file /tmp/test.wav jack 0 0 1.0 0

Syntax:

jack <id> <v_offset> <v_mult> <t_off> file <filename>

<id> is an integer identifier 0 to 3

<v_offset> is offset added in Volts

<v_mult> is the multiplier when converting sndfile-float [0..1] to volts

<t_off> is a offset in miliseconds added when seeking the sound-file

NOTE: The option file must precede the option jack.

txt2snd

txt2snd allows to convert spice output int wav files - it's yet rather simple but has a built-in help.

It reads 4 tabulator seprarated values per line in the format:

<idx/int> <time|ms/float> <ignored/float> <value/float>

example:

11 8.916652e-05 1.846313e-02 -7.477363e-01

this format can easly be generated by SPICE. this example 20 seconds of net 5 will be in written at 48kSPS

.print tran v(4) v(5) .tran 2.08333e-05 20.0 0 2.08333e-05 .op

Note: the rounding (spice-milliseconds to audio-sample) is buggy and includes an only sometimes working workaround (use –verbose to investigate skipped/missing frames).

the following script might come in handy..

#!/bin/sh INFILE=example.netlist OUTFILE=/tmp/spice.txt WAVFILE=/tmp/spice.wav echo "# writing data to $OUTFILE" ngspice -b $INFILE | awk 'BEGIN{go=0;} /^-------------------------------------/{go=1;} /^[0-9]/{if (go==1) print $0;}' > $OUTFILE echo "# txt to snd" cat $OUTFILE | txt2snd $WAVFILE echo "# done."

Example

A complete spice3 example:

V_V2 1 0 file /tmp/test.wav jack 0 0 1.0 0 R_R1 1 0 1M .print tran v(1) v(1) .tran 2.08333e-05 2.0 0 2.08333e-05 .op .END

References

spice source

http://www-ti.informatik.uni-tuebingen.de/~bernauer/lehre/ti-1-0506/spice/ngspice.pdf

¹⁾ simulating 1sec audio of the foxx-effect on my Core-Duo 1.6GHz takes about 4sec

²⁾ 16-bit signed-int-LE

ardour

Mon, 09 Apr 2007 15:54:58 +0000

ardour is digital audio workstation software. You can use it to record, edit and mix multi-track audio. You can produce your own CDs, mix video soundtracks, or just experiment with new ideas about music and sound.

tools:

xjadeo - video player synchronized to ardour via jack-transport.

gjvidtimeline - video timeline, can be synced to ardour

local resources:

{{wiki:ardour-svn1686-ui1024.diff|patch to ardour source} - decrease default font-size for 1024×768

ardour2_ui.rc - decreased font-size for 1024×768 - resource config file for ardour2

[warn=dd]	set a global warning period in days before the task has to be finished, the item changes its' color to orange	optional (defaults to 5)
[due=dd]	set a global due to period in days before the task has to be finished, the item changes its' color to red	optional (defaults to 2)
[#]	A leading '#' marks a Todo as done	optional
[@context]	The context of the Todo ( `_` will be transformed to space ).	required
[p:project]	Specifies if a todo item belongs to a certain project ( `_` will be transformed to space ).	optional
[w:dd]	overwrite global warning period by days	optional
[d:yyyy-mm-dd]	The date until when the task should be done, if you use mm-dd the year will be appended automatically, same if you only use dd the month and the year will be appended automatically	optional
[describing text]	Describing text. Must be on a new (one linebreak) line (Wiki Syntax can be used to format).	required