gmed_n.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.
****************************************************************************************/
/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.5.0   March 2, 2001
*                                R99   Version 3.2.0
*                                REL-4 Version 4.0.0
*
********************************************************************************
*
*      File             : gmed_n.h
*      Purpose          : calculates N-point median.
*
********************************************************************************
*/
#ifndef gmed_n_h
#define gmed_n_h "$Id $"

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

#ifdef __cplusplus
extern "C"
{
#endif

    /*
    ********************************************************************************
    *                         DEFINITION OF DATA TYPES
    ********************************************************************************
    */

    /*
    ********************************************************************************
    *                         DECLARATION OF PROTOTYPES
    ********************************************************************************
    */
    Word16 gmed_n(    /* o : index of the median value (0...N-1)      */
        Word16 ind[], /* i : Past gain values                         */
        Word16 n      /* i : The number of gains; this routine        */
        /*     is only valid for a odd number of gains  */
    );


#ifdef __cplusplus
}
#endif

#endif