141 lines
5.2 KiB
C
141 lines
5.2 KiB
C
/* ------------------------------------------------------------------
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* Copyright (C) 1998-2009 PacketVideo
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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* -------------------------------------------------------------------
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*/
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/****************************************************************************************
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Portions of this file are derived from the following 3GPP standard:
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3GPP TS 26.073
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ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
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Available from http://www.3gpp.org
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(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
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Permission to distribute, modify and use this file under the standard license
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terms listed above has been obtained from the copyright holder.
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****************************************************************************************/
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/*
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------------------------------------------------------------------------------
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Filename: /audio/gsm_amr/c/include/preemph.h
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Date: 02/05/2002
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------------------------------------------------------------------------------
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REVISION HISTORY
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Description: Placed header file in the proper template format. Added
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parameter pOverflow for the basic math ops.
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Description: Replaced "int" and/or "char" with OSCL defined types.
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Description: Moved _cplusplus #ifdef after Include section.
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Description:
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------------------------------------------------------------------------------
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INCLUDE DESCRIPTION
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This file contains all the constant definitions and prototype definitions
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needed by the file, preemph.c
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------------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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; CONTINUE ONLY IF NOT ALREADY DEFINED
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----------------------------------------------------------------------------*/
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#ifndef preemph_h
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#define preemph_h "$Id $"
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/*----------------------------------------------------------------------------
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; INCLUDES
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----------------------------------------------------------------------------*/
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#include "typedef.h"
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/*--------------------------------------------------------------------------*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*----------------------------------------------------------------------------
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; MACROS
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; Define module specific macros here
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; DEFINES
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; Include all pre-processor statements here.
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; EXTERNAL VARIABLES REFERENCES
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; Declare variables used in this module but defined elsewhere
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; SIMPLE TYPEDEF'S
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; ENUMERATED TYPEDEF'S
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----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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; STRUCTURES TYPEDEF'S
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----------------------------------------------------------------------------*/
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typedef struct
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{
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Word16 mem_pre; /* filter state */
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} preemphasisState;
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/*----------------------------------------------------------------------------
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; GLOBAL FUNCTION DEFINITIONS
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; Function Prototype declaration
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----------------------------------------------------------------------------*/
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Word16 preemphasis_reset(preemphasisState *st);
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/* reset of preemphasis filter (i.e. set state memory to zero)
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returns 0 on success
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*/
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void preemphasis_exit(preemphasisState **st);
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/* de-initialize preemphasis filter (i.e. free status struct)
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stores NULL in *st
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*/
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void preemphasis(
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preemphasisState *st, /* (i/o): preemphasis filter state */
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Word16 *signal, /* (i/o): input signal overwritten by the output */
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Word16 g, /* (i) : preemphasis coefficient */
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Word16 L, /* (i) : size of filtering */
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Flag *pOverflow /* (o) : overflow indicator */
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);
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/*----------------------------------------------------------------------------
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; END
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----------------------------------------------------------------------------*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* preemph_H_ */
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