apps/codecs/libspeex/filterbank.h

   1 /* Copyright (C) 2006 Jean-Marc Valin */
   2 /**
   3    @file filterbank.h
   4    @brief Converting between psd and filterbank
   5  */
   6 /*
   7    Redistribution and use in source and binary forms, with or without
   8    modification, are permitted provided that the following conditions are
   9    met:
  10
  11    1. Redistributions of source code must retain the above copyright notice,
  12    this list of conditions and the following disclaimer.
  13
  14    2. Redistributions in binary form must reproduce the above copyright
  15    notice, this list of conditions and the following disclaimer in the
  16    documentation and/or other materials provided with the distribution.
  17
  18    3. The name of the author may not be used to endorse or promote products
  19    derived from this software without specific prior written permission.
  20
  21    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24    DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  25    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31    POSSIBILITY OF SUCH DAMAGE.
  32 */
  33
  34 #ifndef FILTERBANK_H
  35 #define FILTERBANK_H
  36
  37 #include "arch.h"
  38
  39 typedef struct {
  40    int *bank_left;
  41    int *bank_right;
  42    spx_word16_t *filter_left;
  43    spx_word16_t *filter_right;
  44 #ifndef FIXED_POINT
  45    float *scaling;
  46 #endif
  47    int nb_banks;
  48    int len;
  49 } FilterBank;
  50
  51
  52 FilterBank *filterbank_new(int banks, spx_word32_t sampling, int len, int type);
  53
  54 void filterbank_destroy(FilterBank *bank);
  55
  56 void filterbank_compute_bank32(FilterBank *bank, spx_word32_t *ps, spx_word32_t *mel);
  57
  58 void filterbank_compute_psd16(FilterBank *bank, spx_word16_t *mel, spx_word16_t *psd);
  59
  60 #ifndef FIXED_POINT
  61 void filterbank_compute_bank(FilterBank *bank, float *psd, float *mel);
  62 void filterbank_compute_psd(FilterBank *bank, float *mel, float *psd);
  63 #endif
  64
  65
  66 #endif