Marco wrote:
Hi
I am programming a toolset for analysing wav-files with FFT. The
programm works fine, except that the results are crap. I made some
testfiles (4khz and 440Hz) but in the end i see just crap (it does not
show me a peak 440Hz). I believe that my decoding and splitting is
wrong, so i'd like you to tell me whether it is right.
I want to do 2 FT-analyzes per channel (fftlyzer[analyze][channel]).
fftlyzer is a class I made for analyzing the sound. (It is doing the
FT-analyse when it's internal buffer is full, stores the result and
resets the buffer afterwards.)
Here is a snippet of my code.
I think you are missing to handle more then one channel and your add
function is totally borked as data_size is most likely in bytes and you
iterate over a buffer pointer that is int16. So most likely you are over
reading the buffer. My advice is that you first make sure that the data
you get is ok, that by writing the raw buffer to disc and then play it
with some nice program that can handle raw audio. (ffmpeg, sox, audacity).
MvH
Benjamin Larsson
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