libs/mpega/resample.h

   1 /*
   2  * mad - MPEG audio decoder
   3  * Copyright (C) 2000-2003 Robert Leslie
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * $Id$
  20  */
  21
  22 # ifndef RESAMPLE_H
  23 # define RESAMPLE_H
  24
  25 # include "fixed.h"
  26
  27 # define MAX_RESAMPLEFACTOR     6
  28 # define MAX_NSAMPLES           (1152 * MAX_RESAMPLEFACTOR)
  29
  30 struct resample_state {
  31   mad_fixed_t ratio;
  32
  33   mad_fixed_t step;
  34   mad_fixed_t last;
  35 };
  36
  37 int resample_init(struct resample_state *, unsigned int, unsigned int);
  38
  39 # define resample_finish(state)  /* nothing */
  40
  41 unsigned int resample_block(struct resample_state *, unsigned int nsamples,
  42                             mad_fixed_t const *, mad_fixed_t *);
  43
  44 # endif