fft.c File Reference

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Detailed Description

FFT/IFFT transforms.

Definition in file fft.c.

Go to the source code of this file.

Functions
int	ff_fft_init (FFTContext *s, int nbits, int inverse)
	The size of the FFT is 2^nbits.
void	ff_fft_calc_c (FFTContext *s, FFTComplex *z)
	Do a complex FFT with the parameters defined in ff_fft_init().
void	ff_fft_permute (FFTContext *s, FFTComplex *z)
	Do the permutation needed BEFORE calling ff_fft_calc().
void	ff_fft_end (FFTContext *s)

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Function Documentation

int ff_fft_init	(	FFTContext *	s,
		int	nbits,
		int	inverse
	)

The size of the FFT is 2^nbits.

If inverse is TRUE, inverse FFT is done

Definition at line 33 of file fft.c.

Referenced by decoder_impl::decoder_impl(), ff_mdct_init(), imc_decode_init(), main(), and qdm2_decode_init().

void ff_fft_calc_c	(	FFTContext *	s,
		FFTComplex *	z
	)

Do a complex FFT with the parameters defined in ff_fft_init().

The input data must be permuted before with s->revtab table. No 1.0/sqrt(n) normalization is done.

Definition at line 161 of file fft.c.

Referenced by ff_fft_init().

void ff_fft_permute	(	FFTContext *	s,
		FFTComplex *	z
	)

Do the permutation needed BEFORE calling ff_fft_calc().

Definition at line 238 of file fft.c.

Referenced by decoder_impl::apply_filter(), imc_imdct256(), main(), and qdm2_calculate_fft().

void ff_fft_end

(

FFTContext *

s

)

Definition at line 256 of file fft.c.

Referenced by ff_mdct_end(), imc_decode_close(), main(), qdm2_decode_close(), and decoder_impl::~decoder_impl().