apps/codecs/libspeex/fftwrap.h

   1 /* Copyright (C) 2005 Jean-Marc Valin
   2    File: fftwrap.h
   3
   4    Wrapper for various FFTs
   5
   6    Redistribution and use in source and binary forms, with or without
   7    modification, are permitted provided that the following conditions
   8    are met:
   9
  10    - Redistributions of source code must retain the above copyright
  11    notice, this list of conditions and the following disclaimer.
  12
  13    - Redistributions in binary form must reproduce the above copyright
  14    notice, this list of conditions and the following disclaimer in the
  15    documentation and/or other materials provided with the distribution.
  16
  17    - Neither the name of the Xiph.org Foundation nor the names of its
  18    contributors may be used to endorse or promote products derived from
  19    this software without specific prior written permission.
  20
  21    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  25    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32
  33 */
  34
  35 #ifndef FFTWRAP_H
  36 #define FFTWRAP_H
  37
  38 #include "arch.h"
  39
  40 /** Compute tables for an FFT */
  41 void *spx_fft_init(int size);
  42
  43 /** Destroy tables for an FFT */
  44 void spx_fft_destroy(void *table);
  45
  46 /** Forward (real to half-complex) transform */
  47 void spx_fft(void *table, spx_word16_t *in, spx_word16_t *out);
  48
  49 /** Backward (half-complex to real) transform */
  50 void spx_ifft(void *table, spx_word16_t *in, spx_word16_t *out);
  51
  52 /** Forward (real to half-complex) transform of float data */
  53 void spx_fft_float(void *table, float *in, float *out);
  54
  55 /** Backward (half-complex to real) transform of float data */
  56 void spx_ifft_float(void *table, float *in, float *out);
  57
  58 #endif