[FFmpeg-devel] ac3 imdct question
Mon Oct 13 17:47:54 CEST 2008
> Could someone DSP guru please explain me, what ff_fft_calc exactly
> calculates in ff_imdct_half_c() of mdct.c ?
Do I miss something obvious, ff_fft_calc should calculate the fft of a
complex buffer of floats.
> I've tried to replace it (for experimenting with pitch correction...)
> with the 'standard' inverse discrete fourier transform but it does
> not work, the sound (ac3 music sample file) gets heavily distorted :(
> here's my modification:
Replacing the fft with a dct will not work.
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