On Fri, Nov 04, 2016 at 11:37:24PM +0530, Pallavi Kumari wrote: > >> ok, do you know how to compute that or should i explain it ? > > Explanation will help. Is there any function in FFmpeg to get absolute > value of FFT?
hypot() of the 2 real components of each complex value should work complex numbers are like dots on a paper, if you declare the middle of the paper as 0, the 2 components are the x and y coordinates of a complex number and the distance to the 0 point is the absolute value > and how to get frequency data? the data[i] array after the FFT is so that data[i] are the values for the frequency i. You may need to permute them though see libavcodec/tests/fft.c for how exactly the fft relates to a reference fft [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Does the universe only have a finite lifespan? No, its going to go on forever, its just that you wont like living in it. -- Hiranya Peiri
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