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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2011/vik - Most sound</h2>
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<h3>Tracker player</h3>
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</div>
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<a class="Left" href="../toledo/index.html">← 2011/toledo</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2011/vik/vik.c">C code</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2011%2Fvik%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Daniel_Vik">Daniel Vik</a><br>
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
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<!-- BEFORE: 1st line of markdown file: 2011/vik/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>There is an alternate version that should work for Windows. See <a href="#alternate-code">alternate
|
||
code</a> below.</p>
|
||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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||
<p>The current status of this entry is:</p>
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||
<blockquote>
|
||
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
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||
</blockquote>
|
||
<p>For more detailed information see <a href="../../bugs.html#2011_vik">2011/vik in bugs.html</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
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||
<pre><code> ./vik file.mod > audio_file.raw</code></pre>
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<p>If you have <code>mplayer(1)</code>:</p>
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<pre><code> ./vik file.mod | mplayer -demuxer rawaudio -</code></pre>
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<p>Alternatively, you can convert the file to a WAV:</p>
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<pre><code> ./vik file.mod > file.raw; ./raw2wav file.raw > file.wav</code></pre>
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<p>and then play <code>file.wav</code> with a program that can play WAV files.</p>
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<h2 id="try">Try:</h2>
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||
<pre><code> ./try.sh</code></pre>
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<p>The script checks that you have <code>mplayer(1)</code> installed and if it is it will pipe
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<code>vik</code> to <code>mplayer</code>. In this case it will also use <code>raw2wav</code> to convert the file
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to a WAV file. If <code>mplayer(1)</code> cannot be found it will just use <code>raw2wav</code>. This
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way even if one has an <code>mplayer(1)</code> that fails or is for some reason not what is
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expected they can at least play the WAV file manually.</p>
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<p>It is also possible to download a number of music module files from <a href="http://modarchive.org">The Mod
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Archive</a>.</p>
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||
<h2 id="alternate-code">Alternate code:</h2>
|
||
<p>This version is based on the author’s remarks and it should work for Windows.</p>
|
||
<h3 id="alternate-build">Alternate build:</h3>
|
||
<p>Assuming that <code>make</code> is similar enough try:</p>
|
||
<pre><code> make alt</code></pre>
|
||
<h3 id="alternate-use">Alternate use:</h3>
|
||
<p>Use <code>vik.alt</code> as you would <code>vik</code> above.</p>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>This entry converts .MOD audio files to a playable stream
|
||
in a most pleasing manner if you don’t like tremolo or vibrato.</p>
|
||
<p>Also it abuses the C compiler and/or assembler with a partially
|
||
initialized 32MB array. Can you tell what that partial
|
||
initialization for?</p>
|
||
<p>Does it take your system a long time to compile? You may want to do:</p>
|
||
<pre><code> cc -S vik.c</code></pre>
|
||
<p>and examine the resulting assembly file <code>vik.s</code>. On some platforms
|
||
the assembly file is about 128MB in size!</p>
|
||
<p><strong>NOTE</strong>: The <a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/randowan.mod">randowan.mod</a> and <a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/mad_world.mod">mad_world.mod</a> files were
|
||
created by <a href="http://www.translucentboy.com">Henrik Bertilsson</a> and are included
|
||
with his permission.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="introduction">Introduction</h3>
|
||
<p>In 1987, <a href="http://www.vgmpf.com/Wiki/index.php?title=Karsten_Obarski">Karsten
|
||
Obarski</a> <a href="https://en.wikipedia.org/wiki/Ultimate_Soundtracker">changed the
|
||
way</a> music was handled in games and
|
||
demos with the introduction of the MOD file format on <a href="https://en.wikipedia.org/wiki/Amiga">Commodore
|
||
Amiga</a></p>
|
||
<p>A MOD file contains a set of samples, a number of patterns indicating how and
|
||
when the samples are to be played, a list of what patterns to play in what
|
||
order, and a number of effects.</p>
|
||
<h3 id="features">Features</h3>
|
||
<p>This program converts MOD files created with the standard trackers for
|
||
Amiga, e.g. Pro Tracker, Noise Tracker and Sound Tracker to raw 16 bit
|
||
44.1kHz stereo audio. The program supports MOD music with 4, 6, and 8
|
||
channels MOD files with up to 31 samples.</p>
|
||
<p>The MOD format includes many effects for each audio channel and this
|
||
program supports most of them, including:</p>
|
||
<ul>
|
||
<li>Arpeggio</li>
|
||
<li>Slide and fine slide up/down/to note</li>
|
||
<li>Set sample offset</li>
|
||
<li>Volume slide</li>
|
||
<li>Pattern break</li>
|
||
<li>Filter on/off</li>
|
||
<li>Set volume</li>
|
||
<li>Cut sample</li>
|
||
<li>Delay sample</li>
|
||
<li>Delay pattern</li>
|
||
<li>Set speed</li>
|
||
</ul>
|
||
<p>Due to size constraints tremolo and vibrato is not supported. Also, to
|
||
avoid infinite long songs, the position jump feature is ignored.</p>
|
||
<h3 id="songs">Songs</h3>
|
||
<p>With his permission, the package includes two songs composed by Henrik
|
||
Bertilsson, also known as Deelite:</p>
|
||
<ol type="1">
|
||
<li>Mad World</li>
|
||
<li>Randowan</li>
|
||
</ol>
|
||
<h3 id="build">Build</h3>
|
||
<p>Compiling for Unix systems (including cygwin) is straight forward:</p>
|
||
<pre><code> gcc -o vik vik.c</code></pre>
|
||
<h3 id="usage">Usage</h3>
|
||
<h4 id="convert-mod-file-to-raw-44.1khz-stereo-audio-file">Convert MOD file to raw 44.1kHz stereo audio file</h4>
|
||
<pre><code> ./vik mad_world.mod > audio_file.raw</code></pre>
|
||
<h4 id="listen-to-the-mod-file-streaming-to-mplayer">Listen to the MOD file (streaming to mplayer)</h4>
|
||
<pre><code> ./vik randowan.mod | mplayer -demuxer rawaudio -</code></pre>
|
||
<p>(Don’t forget the last <code>-</code> as it makes mplayer read from <code>stdin</code>.)</p>
|
||
<h3 id="obfuscation">Obfuscation</h3>
|
||
<p>The IOCCC rules did not put a limit on the entropy of the source code,
|
||
and it appears that the general entropy rules don’t apply. An estimate
|
||
is that the code density entropy of this entry is <code>~1.2</code> which means that
|
||
there are around 2500 characters of code carrying information, yet there
|
||
are only 2037 IOCCC characters of actual code. Most of the additional
|
||
characters are encoded with non-counting characters in the frequency
|
||
table. But there are also <code>~50</code> or so white space characters spread out
|
||
through the source code that carry information.</p>
|
||
<p>The use of macros certainly adds to the obfuscation but the reason for
|
||
using them is mainly to fit as many features as possible within the size
|
||
limits. So please excuse the use of them.</p>
|
||
<p>Once the preprocessor is run, the code gets more interesting. The MOD player is
|
||
basically a register based <a href="https://en.wikipedia.org/wiki/Finite-state_machine">state
|
||
machine</a> and all the
|
||
<a href="https://en.wikipedia.org/wiki/Magic_(programming)#Variants">magic</a> is hidden in a fog of short statements. Many of the register updates
|
||
are conditional and the program uses the <code>?:</code> operator (sigh) mainly to save
|
||
space, but also to leverage the comma operator and precedence more efficiently.</p>
|
||
<h3 id="portability">Portability</h3>
|
||
<p>The program is portable to most platforms. The only system dependency is
|
||
that the program relies on writing binary data to <code>stdout</code>.</p>
|
||
<p>Microsoft compilers adds a carriage return to newlines, and to compile
|
||
the program with this platform, the following line can be added after
|
||
the main declaration in order for the program to run correctly:</p>
|
||
<pre><code> _setmode(_fileno(stdout), 0x8000);</code></pre>
|
||
<p><strong>NOTE</strong>: this is what the <a href="#alternate-code">alternate version</a> is for.</p>
|
||
<h3 id="limitations">Limitations</h3>
|
||
<p>The program only runs when a valid MOD file is passed as argument. If
|
||
no argument is passed, the program crashes.</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
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|
||
|
||
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|
||
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|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2011vik">Inventory for 2011/vik</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/vik.c">vik.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/vik.alt.c">vik.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/vik.orig.c">vik.orig.c</a> - original source code</li>
|
||
<li><a href="mad_world.mod">mad_world.mod</a> - 4-channel Protracker module sound data</li>
|
||
<li><a href="randowan.mod">randowan.mod</a> - 4-channel Protracker module sound data</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/raw2wav">raw2wav</a> - convert raw format to WAV format</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/try.sh">try.sh</a> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2011_vik.tar.bz2">2011_vik.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2011/vik/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
|
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|
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|
||
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|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2011%2Fvik%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
||
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</div>
|
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</body>
|
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|
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