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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/bgnscd.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/bgnscd.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/bgnscd.h b/media/libstagefright/codecs/amrnb/dec/src/bgnscd.h new file mode 100644 index 0000000..41349d9 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/bgnscd.h @@ -0,0 +1,159 @@ +/* ------------------------------------------------------------------ + * 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_ */ |