| /* ------------------------------------------------------------------ |
| * 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/bgnscd.h |
| |
| Date: 12/29/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| File : bgnscd.h |
| Purpose : Background noise source charateristic detector (SCD) |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef _BGNSCD_H_ |
| #define _BGNSCD_H_ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "typedef.h" |
| #include "cnst.h" |
| |
| /*--------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; [Define module specific macros here] |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; [Include all pre-processor statements here.] |
| ----------------------------------------------------------------------------*/ |
| #define L_ENERGYHIST 60 |
| #define INV_L_FRAME 102 |
| |
| |
| /* 2*(160*x)^2 / 65536 where x is FLP values 150,5 and 50 */ |
| #define FRAMEENERGYLIMIT 17578 /* 150 */ |
| #define LOWERNOISELIMIT 20 /* 5 */ |
| #define UPPERNOISELIMIT 1953 /* 50 */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 frameEnergyHist[L_ENERGYHIST]; |
| |
| /* state flags */ |
| Word16 bgHangover; /* counter; number of frames after last speech frame */ |
| |
| } Bgn_scdState; |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; [List function prototypes here] |
| ----------------------------------------------------------------------------*/ |
| /* |
| * Function : Bgn_scd_init |
| * Purpose : Allocates initializes state memory |
| * Description : Stores pointer to filter status struct in *st. This |
| * pointer has to be passed to Bgn_scd in each call. |
| * Returns : 0 on success |
| */ |
| Word16 Bgn_scd_init(Bgn_scdState **st); |
| |
| /* |
| * Function : Bgn_scd_reset |
| * Purpose : Resets state memory |
| * Returns : 0 on success |
| */ |
| Word16 Bgn_scd_reset(Bgn_scdState *st); |
| |
| /* |
| * Function : Bgn_scd_exit |
| * Purpose : The memory used for state memory is freed |
| * Description : Stores NULL in *s |
| * Returns : void |
| */ |
| void Bgn_scd_exit(Bgn_scdState **st); |
| |
| /* |
| * Function : Bgn_scd |
| * Purpose : Charaterice synthesis speech and detect background noise |
| * Returns : background noise decision; 0 = bgn, 1 = no bgn |
| */ |
| Word16 Bgn_scd(Bgn_scdState *st, /* i : State variables for bgn SCD */ |
| Word16 ltpGainHist[], /* i : LTP gain history */ |
| Word16 speech[], /* o : synthesis speech frame */ |
| Word16 *voicedHangover,/* o : # of frames after last voiced frame */ |
| Flag *pOverflow |
| ); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _BGNSCD_H_ */ |