qgain795.h

实现3GPP的GSM中AMR语音的CODECS。

/* ------------------------------------------------------------------
 * Copyright (C) 2008 PacketVideo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 * -------------------------------------------------------------------
 */
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:

    3GPP TS 26.073
    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
    Available from http://www.3gpp.org

(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------



 Filename: /audio/gsm_amr/c/include/qgain795.h

     Date: 02/05/2002

------------------------------------------------------------------------------
 REVISION HISTORY

 Description: Placed header file in the proper template format.  Added
 parameter pOverflow for the basic math ops.

 Description: Moved _cplusplus #ifdef after Include section.

 Description:

------------------------------------------------------------------------------
 INCLUDE DESCRIPTION

 This file contains all the constant definitions and prototype definitions
 needed by the file, qgain795.c

------------------------------------------------------------------------------
*/

/*----------------------------------------------------------------------------
; CONTINUE ONLY IF NOT ALREADY DEFINED
----------------------------------------------------------------------------*/
#ifndef qgain795_h
#define qgain795_h "$Id $"

/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "typedef.h"
#include "g_adapt.h"

/*--------------------------------------------------------------------------*/
#ifdef __cplusplus
extern "C"
{
#endif

    /*----------------------------------------------------------------------------
    ; MACROS
    ; Define module specific macros here
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; DEFINES
    ; Include all pre-processor statements here.
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; EXTERNAL VARIABLES REFERENCES
    ; Declare variables used in this module but defined elsewhere
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; SIMPLE TYPEDEF'S
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; ENUMERATED TYPEDEF'S
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; STRUCTURES TYPEDEF'S
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; GLOBAL FUNCTION DEFINITIONS
    ; Function Prototype declaration
    ----------------------------------------------------------------------------*/
    void
    MR795_gain_quant(
        GainAdaptState *adapt_st, /* i/o: gain adapter state structure       */
        Word16 res[],             /* i  : LP residual,                  Q0   */
        Word16 exc[],             /* i  : LTP excitation (unfiltered),  Q0   */
        Word16 code[],            /* i  : CB innovation (unfiltered),   Q13  */
        Word16 frac_coeff[],      /* i  : coefficients (5),             Q15  */
        Word16 exp_coeff[],       /* i  : energy coefficients (5),      Q0   */
        /*      coefficients from calc_filt_ener() */
        Word16 exp_code_en,       /* i  : innovation energy (exponent), Q0   */
        Word16 frac_code_en,      /* i  : innovation energy (fraction), Q15  */
        Word16 exp_gcode0,        /* i  : predicted CB gain (exponent), Q0   */
        Word16 frac_gcode0,       /* i  : predicted CB gain (fraction), Q15  */
        Word16 L_subfr,           /* i  : Subframe length                    */
        Word16 cod_gain_frac,     /* i  : opt. codebook gain (fraction),Q15  */
        Word16 cod_gain_exp,      /* i  : opt. codebook gain (exponent), Q0  */
        Word16 gp_limit,          /* i  : pitch gain limit                   */
        Word16 *gain_pit,         /* i/o: Pitch gain (unquant/quant),   Q14  */
        Word16 *gain_cod,         /* o  : Code gain,                    Q1   */
        Word16 *qua_ener_MR122,   /* o  : quantized energy error,       Q10  */
        /*      (for MR122 MA predictor update)    */
        Word16 *qua_ener,         /* o  : quantized energy error,       Q10  */
        /*      (for other MA predictor update)    */
        Word16 **anap,            /* o  : Index of quantization              */
        /*      (first gain pitch, then code pitch)*/
        Flag   *pOverflow         /* o  : overflow indicator                 */
    );

    /*----------------------------------------------------------------------------
    ; END
    ----------------------------------------------------------------------------*/
#ifdef __cplusplus
}
#endif

#endif /* qgain795_H_ */