How can I get duration of AudioInputStream?

I want to get duraction of an AudioInputStream (in microseconds). How can I easily do that? I found how can I get duration of an audio file:, but can开发者_开发百科't do that, because of encapsulation. The only object I see is the instance of an AudioInputStream class.

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getFrameLength() returns the stream length in frames, getFormat().getFrameRate() will give you the number of frames per second.

long durationInMillis = 1000 * getFrameLength() / getFormat().getFrameRate();