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    between Google Inc. and  Fraunhofer
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   $Id$
   Author(s):   M. Lohwasser
   Description: fixed point abs definitions

   This software and/or program is protected by copyright law and international
   treaties. Any reproduction or distribution of this software and/or program,
   or any portion of it, may result in severe civil and criminal penalties, and
   will be prosecuted to the maximum extent possible under law.

******************************************************************************/

#ifndef _AUTOCORR_2ND_H
#define _AUTOCORR_2ND_H



#include "common_fix.h"

typedef struct {
  FIXP_DBL  r00r;
  FIXP_DBL  r11r;
  FIXP_DBL  r22r;
  FIXP_DBL  r01r;
  FIXP_DBL  r02r;
  FIXP_DBL  r12r;
  FIXP_DBL  r01i;
  FIXP_DBL  r02i;
  FIXP_DBL  r12i;
  FIXP_DBL  det;
  int det_scale;
} ACORR_COEFS;

#define LPC_ORDER 2


INT
autoCorr2nd_real (ACORR_COEFS *ac,          /*!< Pointer to autocorrelation coeffs */
                  const FIXP_DBL *reBuffer, /*!< Pointer to to real part of spectrum */
                  const int len             /*!< Number of qmf slots */
                 );
INT
autoCorr2nd_cplx (ACORR_COEFS *ac,           /*!< Pointer to autocorrelation coeffs */
                  const FIXP_DBL *reBuffer,  /*!< Pointer to to real part of spectrum */
                  const FIXP_DBL *imBuffer,  /*!< Pointer to imag part of spectrum */
                  const int len              /*!< Number of qmf slots */
                 );


#endif /* _AUTOCORR_2ND_H */