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copied!<p>To answer your first question, you can check if the <a href="http://java.sun.com/javase/6/docs/api/javax/sound/sampled/Line.Info.html" rel="nofollow noreferrer">Line.Info</a> object for your recording input matches <a href="http://java.sun.com/javase/6/docs/api/javax/sound/sampled/Port.Info.html#LINE_IN" rel="nofollow noreferrer">Port.Info.LINE_IN</a> like this:</p> <pre><code>public static boolean isLineIn(Line.Info lineInfo) { Line.Info[] detected = AudioSystem.getSourceLineInfo(Port.Info.LINE_IN); for (Line.Info lineIn : detected) { if (lineIn.matches(lineInfo)) { return true; } } return false; } </code></pre> <p>However, this doesn't work with operating systems or soundcard driver APIs that don't provide the type of each available mixer channel. So when I test it on Windows it works, but not on Linux or Mac. For more information and recommendations, see this <a href="http://www.jsresources.org/faq_audio.html#no_predefined_ports" rel="nofollow noreferrer">FAQ</a>.</p> <p>Regarding your second question, you can try changing the recording input settings through a <a href="http://java.sun.com/javase/6/docs/api/javax/sound/sampled/Control.html" rel="nofollow noreferrer">Control</a> class. In particular, see <a href="http://java.sun.com/javase/6/docs/api/javax/sound/sampled/FloatControl.Type.html" rel="nofollow noreferrer">FloatControl.Type</a> for some common settings. Keep in mind that the availability of these controls depends on the operating system and soundcard drivers, just like line-in detection.</p>

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