Landon Curt Noll
a9ca93ec47
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<title>2014/vik - Best handling of beeps</title>
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2014/vik - Best handling of beeps</h2>
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<div class="navbar">
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<a class="Left" href="../skeggs/index.html">← skeggs</a>
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<a class="Left" href="../index.html">↑ 2014 ↑</a>
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<a class="Left" href="../wiedijk/index.html">wiedijk →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/prog.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2014%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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</ul>
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<!-- BEFORE: 1st line of markdown file: 2014/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 will theoretically work with Windows
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compilers (if anything in Windows works :-) ). See the <a href="#alternate-code">Alternate
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code</a> section below.</p>
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<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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<pre><code> STATUS: known bug - please help us fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2014_vik">2014 vik bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> echo foo | ./prog > audio_file.raw
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echo foo | ./prog | mplayer -demuxer rawaudio -</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>The alternate code, <a href="prog.alt.c">prog.alt.c</a>, is based on the author’s
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instructions on how to get it to work with Windows.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>prog.alt</code> as you would <code>prog</code> above as well as below.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This program sets a new tone for obfuscation. But do you understand
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what it says about obfuscation? Perhaps:</p>
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<pre><code> ./prog < prog.c > prog.raw</code></pre>
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<p>might speak to your coding style? If not, then perhaps:</p>
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<pre><code> ./prog < README.md | mplayer -demuxer rawaudio -</code></pre>
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<p>might help? :-)</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="remarks">Remarks</h3>
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<p>This program converts ASCII text to Morse audio file and vice versa. As far as
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I can tell, there are at least six chocolate references in this program.</p>
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<p>This program can convert text to Morse to a raw 44.1kHz stereo audio file.
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Via streaming to <code>mplayer(1)</code>, you can listen to the Morse audio.</p>
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<p>Don’t forget the last ‘<code>-</code>’ as it makes <code>mplayer(1)</code> read from <code>stdin</code>.</p>
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<h2 id="convert-audio-file-with-morse-signals-to-text">Convert audio file with Morse signals to text</h2>
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<pre><code> ./prog e < audio_file.raw</code></pre>
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<p>or alternatively pass a .wav file as input.</p>
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<p>The preferred input format 44.1kHz stereo, but it does a decent job on mono
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input and different frequencies as well.</p>
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<h3 id="portability">Portability</h3>
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<p>The program is portable to most platforms. The only system dependency is that
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the program relies on writing binary data to <code>stdout</code>.</p>
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<p>Microsoft compilers add a carriage return to newlines, and to compile the
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program with this platform, the following line can be added to <code>main()</code> before
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any code in order for the program to run correctly:</p>
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<pre><code> _setmode(_fileno(stdout), 0x8000);</code></pre>
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<p>NOTE: see the <a href="prog.alt.c">alternate code</a> for this.</p>
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<h3 id="known-issues">Known Issues</h3>
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<p>The program uses a quite simple algorithm for detecting tone on and off events
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in the Morse signal. Hence the program does not work well with noisy input
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signals. I have tested it with several samples of man made Morse recordings as
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well as computer generated ones.</p>
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<p>Generally, any recording from ham radio transmissions does not decode due to
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noise and echoes. Other man made recordings may decode, but some characters
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can be incorrect due to too big variation in length of tones and pauses.
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However I found some man made recordings on that decode reasonable well.</p>
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<p>If a recording doesn’t decode, you could try to pre-process the input with a
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narrow bandpass filter on the frequency of the transmission.</p>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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<div id="inventory">
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<h1 id="inventory-for-2014vik">Inventory for 2014/vik</h1>
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</div>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/prog.c">prog.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/prog.alt.c">prog.alt.c</a> - alternative source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/prog.orig.c">prog.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/try.sh">try.sh</a> - how to run</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="2014_vik.tar.bz2">2014_vik.tar.bz2</a> - download entry tarball</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/README.md">README.md</a> - markdown source for this web page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/.path">.path</a> - directory path from top directory</li>
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<li><a href="index.html">index.html</a> - this web page</li>
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</ul>
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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<p>All IOCCC content including this file and web page are:</p>
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<b> Copyright © 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
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<p>This work is licensed by Landon Curt Noll under:</p>
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target="_blank" rel="license noopener noreferrer" style="display:inline-block;"> CC BY-SA 4.0
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<p>The <b>CC BY-SA 4.0 LEGAL CODE</b> for this license is found under:</p>
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2014%2Fvik%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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