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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/agc.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/agc.h | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/agc.h b/media/libstagefright/codecs/amrnb/dec/src/agc.h new file mode 100644 index 0000000..b6e3249 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/agc.h @@ -0,0 +1,163 @@ +/* ------------------------------------------------------------------ + * 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/agc.h + + Date: 12/07/2001 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Removed unneeded sections of the standard template. + Updated function prototype for agc() and agc2() to match new + interface + + Description: Changed paramter name from "overflow" to "pOverflow" for + functions agc() and agc2() + + Description: Replaced "int" and/or "char" with OSCL defined types. + + + Description: Moved _cplusplus #ifdef after Include section. + + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + File : agc.h + Purpose : Scales the postfilter output on a subframe basis + : by automatic control of the subframe gain. + +------------------------------------------------------------------------------ +*/ + +#ifndef _AGC_H_ +#define _AGC_H_ + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" + +/*--------------------------------------------------------------------------*/ +#ifdef __cplusplus +extern "C" +{ +#endif + + /*---------------------------------------------------------------------------- + ; MACROS + ; [Define module specific macros here] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; DEFINES + ; [Include all pre-processor statements here.] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; EXTERNAL VARIABLES REFERENCES + ; [Declare variables used in this module but defined elsewhere] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; SIMPLE TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; ENUMERATED TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; STRUCTURES TYPEDEF'S + ----------------------------------------------------------------------------*/ + typedef struct + { + Word16 past_gain; + } agcState; + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; [List function prototypes here] + ----------------------------------------------------------------------------*/ + /*---------------------------------------------------------------------------- + ; + ; Function : agc_reset + ; Purpose : Reset of agc (i.e. set state memory to 1.0) + ; Returns : 0 on success + ; + ----------------------------------------------------------------------------*/ + Word16 agc_reset(agcState *st); + + + /*---------------------------------------------------------------------------- + ; + ; Function : agc + ; Purpose : Scales the postfilter output on a subframe basis + ; Description : sig_out[n] = sig_out[n] * gain[n]; + ; where gain[n] is the gain at the nth sample given by + ; gain[n] = agc_fac * gain[n-1] + (1 - agc_fac) g_in/g_out + ; g_in/g_out is the square root of the ratio of energy at + ; the input and output of the postfilter. + ; + ----------------------------------------------------------------------------*/ + void agc( + agcState *st, /* i/o : agc state */ + Word16 *sig_in, /* i : postfilter input signal, (l_trm) */ + Word16 *sig_out, /* i/o : postfilter output signal, (l_trm) */ + Word16 agc_fac, /* i : AGC factor */ + Word16 l_trm, /* i : subframe size */ + Flag *pOverflow /* i : overflow flag */ + ); + + /*---------------------------------------------------------------------------- + ; + ; Function: agc2 + ; Purpose: Scales the excitation on a subframe basis + ; + ----------------------------------------------------------------------------*/ + void agc2( + Word16 *sig_in, /* i : postfilter input signal */ + Word16 *sig_out, /* i/o : postfilter output signal */ + Word16 l_trm, /* i : subframe size */ + Flag *pOverflow /* i : overflow flag */ + ); + +#ifdef __cplusplus +} +#endif + +#endif /* _AGC_H_ */ + + |