apps/codecs/libwma/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 //#include "types.h"
  21 #include "fft.h"
  22
  23 typedef struct MDCTContext
  24 {
  25     int n;  /* size of MDCT (i.e. number of input data * 2) */
  26     int nbits; /* n = 2^nbits */
  27     /* pre/post rotation tables */
  28     fixed32 *tcos;
  29     fixed32 *tsin;
  30     FFTContext fft;
  31 }
  32 MDCTContext;
  33
  34 int ff_mdct_init(MDCTContext *s, int nbits, int inverse);
  35 void ff_imdct_calc(MDCTContext *s, fixed32 *output, fixed32 *input);
  36 int mdct_init_global(void);
  37