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POBest practice: Where to resample PCM and which tool?
 

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    <p>I have developed a kernel module (Android) which provides me:</p> <pre><code>PCM 16-bit 48000 Hz 2 channel </code></pre> <p>and I want to stream it to an Apple's Airport Express (AEX) in java.</p> <p>The AEX needs 44.1 kHz PCM so I have to resample the PCM-stream.</p> <p>I have following possibilities, but which is the best?</p> <h2>1. Use the C-program "raop_play" (part of <a href="http://raop-play.sourceforge.net/">raop-play</a>)</h2> <pre><code>advantages: high-performant due to native C already uses libsamplerate to resample wav, mp3, ogg, flac, aac, pls openssl as static library usable via command-line from my java-program via Runtime.exec() disadvantages: I am relative new to C overloaded: I don't need wav, mp3.. only PCM many dependencies with GPL-libraries which I have to compile for Android only supports PCM already with 44.1 kHz, no resampling for PCM implemented yet -&gt; have to implement resampling for PCM </code></pre> <h2>2. Resample &amp; stream in java (with <a href="https://github.com/intervigilium/libresample">libresample JNI-bridge</a>)</h2> <pre><code>advantages: I CAN java :) middle-performant due to resamling in C , but streaming in java just one dependency to LGPL-library no Runtime.exec() needed disadvantages: needs [bouncycastle][3] for AES which is a bit larger than openssl less performant than solution #1 (but maybe fast enough) </code></pre> <h2>3. Resample already in kernel module</h2> <pre><code>advantages: most performant no resampling at higher level disadvantages: I am relative new to C Is it possible to use libsamplerate or libresample in kernel-space?! </code></pre>
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