/*
*****************************************************************************
*
*??????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?????????????:?agc.c
*
*****************************************************************************
*/

/*
*****************************************************************************
*?????????????????????????MODULE?INCLUDE?FILE?AND?VERSION?ID
*****************************************************************************
*/
#include?“agc.h“
const?char?agc_id[]?=?“@（#）$Id?$“?agc_h;

/*
*****************************************************************************
*?????????????????????????INCLUDE?FILES
*****************************************************************************
*/
#include?
#include?
#include?“typedef.h“
#include?“basic_op.h“
#include?“count.h“
#include?“cnst.h“
#include?“inv_sqrt.h“
?
/*
*****************************************************************************
*?????????????????????????LOCAL?VARIABLES?AND?TABLES
*****************************************************************************
*/

/*
*****************************************************************************
*?????????????????????????LOCAL?PROGRAM?CODE
*****************************************************************************
*/

static?Word32?energy_old（?/*?o?:?return?energy?of?signal?????*/
????Word16?in[]??????????/*?i?:?input?signal?（length?l_trm）?*/
????Word16?l_trm??????????/*?i?:?signal?length???????????????*/
）
{
????Word32?s;
????Word16?i?temp;

????temp?=?shr?（in[0]?2）;
????s?=?L_mult?（temp?temp）;
????
????for?（i?=?1;?i?????{
????????temp?=?shr?（in[i]?2）;
????????s?=?L_mac?（s?temp?temp）;
????}

????return?s;
}

static?Word32?energy_new（?/*?o?:?return?energy?of?signal?????*/
????Word16?in[]??????????/*?i?:?input?signal?（length?l_trm）?*/
????Word16?l_trm??????????/*?i?:?signal?length???????????????*/
）
{
????Word32?s;
????Word16?i;
????Flag?ov_save;

????ov_save?=?Overflow;?move16?（）;?/*?save?overflow?flag?in?case?energy_old?*/
???????????????????????????????????/*?must?be?called????????????????????????*/
????s?=?L_mult（in[0]?in[0]）;
????for?（i?=?1;?i?????{
????????s?=?L_mac（s?in[i]?in[i]）;
????}
????
????/*?check?for?overflow?*/
????test?（）;?
????if?（L_sub?（s?MAX_32）?==?0L）
????{
????????Overflow?=?ov_save;?move16?（）;?/*?restore?overflow?flag?*/
????????s?=?energy_old?（in?l_trm）;?move32?（）;?/*?function?result?*/
????}
????else
????{
???????s?=?L_shr（s?4）;
????}

????return?s;
}
/*
*****************************************************************************
*?????????????????????????PUBLIC?PROGRAM?CODE
*****************************************************************************
*/
/*
************************

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????8664??2001-12-12?20:08??c-code\agc.c
?????文件????????3842??2001-12-12?20:08??c-code\agc.h
?????文件????????7800??2001-12-12?20:08??c-code\allmodes.txt
?????文件????????1712??2001-12-12?20:08??c-code\amr_chk.csh
?????文件????????3779??2001-12-12?20:08??c-code\autocorr.c
?????文件????????2287??2001-12-12?20:08??c-code\autocorr.h
?????文件????????9812??2001-12-12?20:08??c-code\az_lsp.c
?????文件????????2525??2001-12-12?20:08??c-code\az_lsp.h
?????文件????????3451??2001-12-12?20:08??c-code\a_refl.c
?????文件????????1849??2001-12-12?20:08??c-code\a_refl.h
?????文件??????107410??2001-12-12?20:08??c-code\basicop2.c
?????文件????????3806??2001-12-12?20:08??c-code\basic_op.h
?????文件????????8593??2001-12-12?20:08??c-code\bgnscd.c
?????文件????????3812??2001-12-12?20:08??c-code\bgnscd.h
?????文件???????12994??2003-02-18?11:34??c-code\bitno.tab
?????文件????????3550??2001-12-12?20:08??c-code\bits2prm.c
?????文件????????1877??2001-12-12?20:08??c-code\bits2prm.h
?????文件????????4961??2001-12-12?20:08??c-code\b_cn_cod.c
?????文件????????3793??2001-12-12?20:08??c-code\b_cn_cod.h
?????文件????????9253??2001-12-12?20:08??c-code\c1035pf.c
?????文件????????1943??2001-12-12?20:08??c-code\c1035pf.h
?????文件???????13896??2001-12-12?20:08??c-code\c2_11pf.c
?????文件????????3011??2001-12-12?20:08??c-code\c2_11pf.h
?????文件?????????736??2001-12-12?20:08??c-code\c2_11pf.tab
?????文件???????14479??2001-12-12?20:08??c-code\c2_9pf.c
?????文件????????3868??2001-12-12?20:08??c-code\c2_9pf.h
?????文件?????????846??2001-12-12?20:08??c-code\c2_9pf.tab
?????文件???????16795??2001-12-12?20:08??c-code\c3_14pf.c
?????文件????????3000??2001-12-12?20:08??c-code\c3_14pf.h
?????文件???????18922??2001-12-12?20:08??c-code\c4_17pf.c
?????文件????????2997??2001-12-12?20:08??c-code\c4_17pf.h
............此處省略233個(gè)文件信息