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reminder of how to get mic monitor
author drewp@bigasterisk.com
date Thu, 01 Jun 2023 14:21:51 -0700
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<h1></h1>
<h2>light9 in 2008</h2>
</div>

</div>


<div class="presentation">

<div class="slide">
<h1>light9 in 2008</h1>
<h2></h2>
<h3>Drew Perttula</h3>
<h4>http://bigasterisk.com/</h4>
</div>


<div class="slide">
  <h1>Existing system</h1>
From my June 2005 presentation:

<pre style="font-size: 60%">

              (play cmds)
    ascoltami -----------> mpd ------> audio out
        | (timing)
        v
    curvecalc    subcomposer    keyboardcomposer
        |            |                 |
        +---         |             ----+
            \-----   |    --------/
                  \--+---/
                     | (light levels)
                     v
                 dmxserver
                    | (dmx levels)
          ......... v ....................
          .      entec open dmx          .
external  .         | (dmx)              .
hardware  .         v                    .
          .      dmx dimmer              .
          .         | (juice)            .
          .         v                    .
          .      light                   .
          ................................
</pre>

</div>

<div class="slide">
  <h1>External libraries</h1>
  <ul>
    <li>Twisted - event loop and networking, xmlrpc</li>
    <li>tk, tix</li>
    <li>pympd - my twisted interface to mpd</li>
    <li>louie - signals</li>
    <li>mpd - music player daemon</li>
    <li>rdflib</li>
    <li>darcs</li>
  </ul>
</div>

<div class="slide">
  <h1>What's new: real sliders</h1>
  <img src="bcf2000-desk1.jpg" style="float:right; border: 2px solid #005;" width="40%"/>
  <ul>
    <li>$200 board with 8 motorized faders (plus knobs, lights, and buttons)</li>
    <li>Talks midi over usb</li>
    <li>Python/linux driver is easy:
    <pre>
self.dev = open("/dev/snd/midiC1D0")
b0, which, value = [ord(b) for b in 
                    self.dev.read(3)]
self.dev.write(chr(0xb0) + 
               chr(which[0]) + 
               chr(int(value)))</pre></li>
  </ul>
</div>

<div class="slide">
  <h1>What's new: RDF for data storage</h1>
  <ul>
    <li>Old system: ad-hoc text files.</li>
    <li>Never do this again.</li>
  </ul>
</div>

<div class="slide">
  <h1>Old file formats</h1>
<pre class="file">
[music]
preSong = silence-4sec.wav
postSong = silence-15sec.wav
</pre>

<pre class="file">
down-l : 0.32005
down-r : 0.3071
down-sides : 0.37
lo-c-cross : 0.24
</pre>

<pre class="file">
scoop-r right(t)
lo-fill can(t)
ch1 chase(t,names=back_colors, ontime=.6, offset=0) * ch1(t)
</pre>

<pre class="file">
patch = {
    ('fill-xl','b31',) : 61,
    ('broke',  'back8','b32',) : 62,
    ('blue-xl','b33broke',) : 63,
</pre>
</div>

<div class="slide">
  <h1>Storage goals</h1>
  <ul>
    <li>Stop inventing and extending syntaxes</li>
    <li>Stop reloading the files all the time. Get incremental 
    updates or query data as it's needed.</li>
    <li>Fancier data structures</li>
    <li>Arbitrary layout of files on disk</li>
    <li>Keep using my most flexible editor (emacs)</li>
  </ul>
</div>

<div class="slide">
  <h1>New system: RDF</h1>
  <ul>
    <li>Most files are RDF data (saved as .n3 or ntriples)</li>
    <li>Syntax(es) are already done, and all values are unambiguously labeled</li>
    <li>Complex data types and relationships are almost as easy as basic ones</li>
    <li>Extensible and upgradable, of course</li>
    <li>Used DSLs and logic programming to abbreviate boring parts</li>
  </ul>
</div>

<div class="slide">
  <h1>New data, shown as n3</h1>
<pre class="file" style="font-size: 80%">
@prefix : &lt;http://light9.bigasterisk.com/&gt; .
@prefix sub: &lt;http://light9.bigasterisk.com/sub/&gt; .
@prefix t: &lt;http://light9.bigasterisk.com/show/dance2008/&#x2936;
           song10/subterm/&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10&gt;
     :subterm   t:blacklight,
                t:song10,
                t:song3black .
t:song10 a :Subterm;
         :expression "song10(t)";
         :sub sub:song10 .
t:blacklight a :Subterm;
             :expression "blacklight(t)&gt;0";
             :sub sub:blacklight .
       </pre>
</div>


<div class="slide">
  <h1>The same data, in xml</h1>
  <pre style="font-size: 45%; line-height: 1.3em;">
&lt;rdf:RDF xmlns="http://light9.bigasterisk.com/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"&gt;

    &lt;rdf:Description rdf:about="http://light9.bigasterisk.com/show/dance2008/song10"&gt;
        &lt;subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight"/&gt;
        &lt;subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10"/&gt;
        &lt;subterm rdf:resource="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song3black"/&gt;
    &lt;/rdf:Description&gt;

    &lt;Subterm rdf:about="http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight"&gt;
        &lt;expression&gt;blacklight(t)&amp;gt;0&lt;/expression&gt;
        &lt;sub rdf:resource="http://light9.bigasterisk.com/sub/blacklight"/&gt;
    &lt;/Subterm&gt;

    &lt;Subterm rdf:about="http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10"&gt;
        &lt;expression&gt;song10(t)&lt;/expression&gt;
        &lt;sub rdf:resource="http://light9.bigasterisk.com/sub/song10"/&gt;
    &lt;/Subterm&gt;
&lt;/rdf:RDF&gt;
</pre>
</div>

<div class="slide">
  <h1>A simple line-based format</h1>
  <pre style="font-size: 45%;">
&lt;http://light9.bigasterisk.com/show/dance2008/song10&gt; &lt;http://light9.bigasterisk.com/subterm&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10&gt; &lt;http://light9.bigasterisk.com/subterm&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10&gt; &lt;http://light9.bigasterisk.com/subterm&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/song3black&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight&gt;&#x2936;
  &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#type&gt; &lt;http://light9.bigasterisk.com/Subterm&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/expression&gt; "blacklight(t)>0" .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/blacklight&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/sub&gt; &lt;http://light9.bigasterisk.com/sub/blacklight&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10&gt;&#x2936;
  &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#type&gt; &lt;http://light9.bigasterisk.com/Subterm&gt; .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/expression&gt; "song10(t)" .

&lt;http://light9.bigasterisk.com/show/dance2008/song10/subterm/song10&gt;&#x2936;
  &lt;http://light9.bigasterisk.com/sub&gt; &lt;http://light9.bigasterisk.com/sub/song10&gt; .
</pre>

</div>

<div class="slide">
  <h1>Again, with less wrapping</h1>
  <pre style="font-size: 40%;">
&lt;http://l9.com/show/dance2008/song10&gt; &lt;http://l9.com/subterm&gt; &lt;http://l9.com/show/dance2008/song10/subterm/blacklight&gt; .
&lt;http://l9.com/show/dance2008/song10&gt; &lt;http://l9.com/subterm&gt; &lt;http://l9.com/show/dance2008/song10/subterm/song10&gt; .
&lt;http://l9.com/show/dance2008/song10&gt; &lt;http://l9.com/subterm&gt; &lt;http://l9.com/show/dance2008/song10/subterm/song3black&gt; .
&lt;http://l9.com/show/dance2008/song10/subterm/blacklight&gt; &lt;http://l9.com/expression&gt; "blacklight(t)>0" .
&lt;http://l9.com/show/dance2008/song10/subterm/blacklight&gt; &lt;http://l9.com/sub&gt; &lt;http://l9.com/sub/blacklight&gt; .
&lt;http://l9.com/show/dance2008/song10/subterm/blacklight&gt; &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#type&gt; &lt;http://l9.com/Subterm&gt; .
&lt;http://l9.com/show/dance2008/song10/subterm/song10&gt; &lt;http://l9.com/expression&gt; "song10(t)" .
&lt;http://l9.com/show/dance2008/song10/subterm/song10&gt; &lt;http://l9.com/sub&gt; &lt;http://l9.com/sub/song10&gt; .
&lt;http://l9.com/show/dance2008/song10/subterm/song10&gt; &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#type&gt; &lt;http://l9.com/Subterm&gt; .
</pre>
</div>

<div class="slide">
  <h1>Again, rendered with graphviz</h1>
  <img src="rdfgraph.png" />
</div>

<div class="slide">
  <h1>What's next: lightsim</h1>
  <ul>
    <li>We could really use a good way to preview scenes</li>
    <li>Hard to use text labels for all the different lighting scenes</li>
    <li>Can't work on lighting cues without looking at the stage</li>
  </ul>
</div>
<div class="slide">
  <h1>lightsim enablers</h1>
  <ul>
    <li>Light obeys superposition: <br/>F(ax+by) = aF(x) + bF(y)</li>
    <li>All my lights are computer-controlled</li>
  </ul>
</div>
<div class="slide">
  <h1>lightsim demos</h1>
  <ul>
    <li>Original version from 2002: Tk, PIL</li>
    <li>Current version: qt, OpenGL</li>
  </ul>
</div>

<div class="slide">
  <h1>More</h1>
  <li>Links related to this project:<br/>
http://delicious.com/drewpca/light9</li>
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