libcelt/c64_fft.h

/* (c) Copyright 2008/2009 Xiph.Org Foundation */
/*
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   modification, are permitted provided that the following conditions
   are met:
   
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   notice, this list of conditions and the following disclaimer.
   
   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
   
   - Neither the name of the Xiph.org Foundation nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
   
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
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*/

#ifndef _dsp_fft_h_
#define _dsp_fft_h_

#include "config.h"

#include "arch.h"
#include "os_support.h"
#include "mathops.h"
#include "stack_alloc.h"

typedef struct {
  int nfft;
  int shift;
  celt_int32 *twiddle;
  celt_int32 *itwiddle;
} c64_fft_t;

extern c64_fft_t *c64_fft16_alloc(int length, int x, int y);
extern void c64_fft16_free(c64_fft_t *state);
extern void c64_fft16_inplace(c64_fft_t *state, celt_int16 *X);
extern void c64_ifft16(c64_fft_t *state, const celt_int16 *X, celt_int16 *Y);

extern c64_fft_t *c64_fft32_alloc(int length, int x, int y);
extern void c64_fft32_free(c64_fft_t *state);
extern void c64_fft32(c64_fft_t *state, const celt_int32 *X, celt_int32 *Y);
extern void c64_ifft32(c64_fft_t *state, const celt_int32 *X, celt_int32 *Y);

#endif