CODEWITHSUNDEEP
c++windowswinapixaudio2
PolGraphic
PolGraphic

Reputation: 3364

How can I get the frequency value at given time with XAudio2?

I've already loaded the .wav audio to the buffer with XAudio2 (Windows 8.1) and to play it I just have to use:

//start consuming audio in the source voice
/* IXAudio2SourceVoice* */ g_source->Start();

//play the sound
g_source->SubmitSourceBuffer(buffer.xaBuffer());

I wonder, how can I get the frequency value at given time with XAudio2?

Upvotes: 0

Views: 405

Answers (1)

Hans Passant
Hans Passant

Reputation: 941515

The question does not make much sense, a .wav file contains a great many frequencies. It is the blend of them that makes it sound like music to your ears, instead of just an artificial generated tone. A blend that's constantly changing.

A signal processing step is required to convert the samples in the .wav file from the time domain to the frequency domain. Generally known as spectrum analysis, the Fast Fourier Transform (FFT) is the standard technique.

A random Google hit on "xaudio2 fft" produced this code sample. No idea how good it is, but something to play with to get the lay of the land. You'll find more about it in this gamedev question.

Upvotes: 2

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