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Question by xeophin · Oct 14, 2010 at 12:07 PM · audioaudiosource

What does the numSamples parameter in GetOutputData actually mean?

Unfortunately, the documentation for AudioSource.GetOutputData() is a bit sparse so, what does the numSamples parameter mean? And what does the function exactly return (yes, an array but of what exactly)?

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Answer by skovacs1 · Oct 14, 2010 at 02:42 PM

The documentation on this is indeed lacking.

If you google define: audio samples, you'll get a fairly clear answer as to what audio samples are, but the simplest explanation is that all digital audio is actually a series of quantized energy levels (samples).

GetOutputData "returns a block of the currently playing source's output data." numSamples would be the number of such samples to return and therefore the size of the returned array. The array returned is an array of float values, representing the quantized value of each sample.

The real question is what "block" is it returning? Is it from the point in the output data where it is currently playing at the moment the function goes through (it reads like this may the case, but doesn't really say) or is it from the beginning of the output data or somewhere else?

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avatar image xeophin · Oct 26, 2010 at 04:41 PM 0
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As far as I tried the function out, it actually returns the value of where the audio is currently playing.

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