modules/codec/wmafixed/mdct.h

   1 /*
   2  * WMA compatible decoder
   3  * Copyright (c) 2002 The FFmpeg Project.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #ifndef WMA_MDCT_H
  21 #define WMA_MDCT_H 1
  22
  23 #include "fft.h"
  24
  25 typedef struct MDCTContext
  26 {
  27     int n;     /* size of MDCT (i.e. number of input data * 2) */
  28     int nbits; /* n = 2^nbits */
  29     /* pre/post rotation tables */
  30     int32_t *tcos;
  31     int32_t *tsin;
  32     FFTContext fft;
  33 }
  34 MDCTContext;
  35
  36 int ff_mdct_init(MDCTContext *s, int nbits, int inverse);
  37 void ff_imdct_calc(MDCTContext *s, int32_t *output, int32_t *input);
  38 int mdct_init_global(void);
  39
  40 #endif