| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 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/src/include/c_g_aver.h |
| |
| Date: 12/29/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| File : c_g_aver.h |
| Purpose : Background noise source charateristic detector (SCD) |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef _C_G_AVER_H_ |
| #define _C_G_AVER_H_ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "typedef.h" |
| #include "mode.h" |
| #include "cnst.h" |
| |
| /*--------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; [Define module specific macros here] |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; [Include all pre-processor statements here.] |
| ----------------------------------------------------------------------------*/ |
| #define L_CBGAINHIST 7 |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL VARIABLES REFERENCES |
| ; [Declare variables used in this module but defined elsewhere] |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| typedef struct |
| { |
| /* history vector of past synthesis speech energy */ |
| Word16 cbGainHistory[L_CBGAINHIST]; |
| |
| /* state flags */ |
| Word16 hangVar; /* counter; */ |
| Word16 hangCount; /* counter; */ |
| |
| } Cb_gain_averageState; |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; [List function prototypes here] |
| ----------------------------------------------------------------------------*/ |
| /* |
| * Function : Cb_gain_average_init |
| * Purpose : Allocates initializes state memory |
| * Description : Stores pointer to filter status struct in *st. This |
| * pointer has to be passed to Cb_gain_average in each call. |
| * Returns : 0 on success |
| */ |
| Word16 Cb_gain_average_init(Cb_gain_averageState **st); |
| |
| /* |
| * Function : Cb_gain_average_reset |
| * Purpose : Resets state memory |
| * Returns : 0 on success |
| */ |
| Word16 Cb_gain_average_reset(Cb_gain_averageState *st); |
| |
| /* |
| * Function : Cb_gain_average_exit |
| * Purpose : The memory used for state memory is freed |
| * Description : Stores NULL in *s |
| * Returns : void |
| */ |
| void Cb_gain_average_exit(Cb_gain_averageState **st); |
| |
| /* |
| * Function : Cb_gain_average |
| * Purpose : Charaterice synthesis speech and detect background noise |
| * Returns : background noise decision; 0 = bgn, 1 = no bgn |
| */ |
| Word16 Cb_gain_average( |
| Cb_gain_averageState *st, /* i/o : State variables for CB gain avergeing */ |
| enum Mode mode, /* i : AMR mode */ |
| Word16 gain_code, /* i : CB gain Q1 */ |
| Word16 lsp[], /* i : The LSP for the current frame Q15 */ |
| Word16 lspAver[], /* i : The average of LSP for 8 frames Q15 */ |
| Word16 bfi, /* i : bad frame indication flag */ |
| Word16 prev_bf, /* i : previous bad frame indication flag */ |
| Word16 pdfi, /* i : potential degraded bad frame ind flag */ |
| Word16 prev_pdf, /* i : prev pot. degraded bad frame ind flag */ |
| Word16 inBackgroundNoise, /* i : background noise decision */ |
| Word16 voicedHangover, /* i : # of frames after last voiced frame */ |
| Flag *pOverflow |
| ); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _C_G_AVER_H_ */ |
| |
| |
