pitch_fr.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

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** Copyright (C) 2000-2005 Trolltech AS and its licensors.
** All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See below for additional copyright and license information
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**********************************************************************/
/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : pitch_fr.h
*      Purpose          : Find the pitch period with 1/3 or 1/6 subsample
*                       : resolution (closed loop).
*
********************************************************************************
*/
#ifndef pitch_fr_h
#define pitch_fr_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
#include "mode.h"

/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
typedef struct {
   Word16 T0_prev_subframe;   /* integer pitch lag of previous sub-frame */
} Pitch_frState;
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
int Pitch_fr_init (Pitch_frState **st);
/* initialize one instance of the pre processing state.
   Stores pointer to filter status struct in *st. This pointer has to
   be passed to Pitch_fr in each call.
   returns 0 on success
 */
 
int Pitch_fr_reset (Pitch_frState *st);
/* reset of pre processing state (i.e. set state memory to zero)
   returns 0 on success
 */

void Pitch_fr_exit (Pitch_frState **st);
/* de-initialize pre processing state (i.e. free status struct)
   stores NULL in *st
 */

Word16 Pitch_fr (        /* o   : pitch period (integer)                    */
    Pitch_frState *st,   /* i/o : State struct                              */
    enum Mode mode,      /* i   : codec mode                                */
    Word16 T_op[],       /* i   : open loop pitch lags                      */
    Word16 exc[],        /* i   : excitation buffer                         */
    Word16 xn[],         /* i   : target vector                             */
    Word16 h[],          /* i   : impulse response of synthesis and   
                                  weighting filters                         */
    Word16 L_subfr,      /* i   : Length of subframe                        */
    Word16 i_subfr,      /* i   : subframe offset                           */
    Word16 *pit_frac,    /* o   : pitch period (fractional)                 */
    Word16 *resu3,       /* o   : subsample resolution 1/3 (=1) or 1/6 (=0) */
    Word16 *ana_index    /* o   : index of encoding                         */
);
 
#endif