213 lines
8.8 KiB
C
213 lines
8.8 KiB
C
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/* ------------------------------------------------------------------
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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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Filename: /audio/gsm_amr/c/include/lsp_avg.h
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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: Moved _cplusplus #ifdef after Include section.
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Who: Date:
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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 lsp_avg.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 int_lpc_h
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#define int_lpc_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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/*----------------------------------------------------------------------------
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; GLOBAL FUNCTION DEFINITIONS
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; Function Prototype declaration
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----------------------------------------------------------------------------*/
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/*
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**************************************************************************
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*
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* Function : Int_lpc_1and3
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* Purpose : Interpolates the LSPs and converts to LPC parameters
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* to get a different LP filter in each subframe.
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* Description : The 20 ms speech frame is divided into 4 subframes.
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* The LSPs are quantized and transmitted at the 2nd and
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* 4th subframes (twice per frame) and interpolated at the
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* 1st and 3rd subframe.
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*
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* |------|------|------|------|
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* sf1 sf2 sf3 sf4
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* F0 Fm F1
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*
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* sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm
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* sf2: Fm sf4: F1
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* Returns : void
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*
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**************************************************************************
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*/
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void Int_lpc_1and3(
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Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
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Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of
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present frame (M) */
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Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of
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present frame (M) */
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Word16 Az[], /* o : interpolated LP parameters in all subfr.
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(AZ_SIZE) */
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Flag *pOverflow
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);
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/*
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**************************************************************************
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*
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* Function : Int_lpc_1and3_2
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* Purpose : Interpolation of the LPC parameters. Same as the Int_lpc
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* function but we do not recompute Az() for subframe 2 and
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* 4 because it is already available.
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* Returns : void
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*
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**************************************************************************
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*/
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void Int_lpc_1and3_2(
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Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
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Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of
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present frame (M) */
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Word16 lsp_new[], /* i : LSP vector at the 4th subframe of
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present frame (M) */
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Word16 Az[], /* o :interpolated LP parameters
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in subframes 1 and 3 (AZ_SIZE) */
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Flag *pOverflow
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);
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/*
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**************************************************************************
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*
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* Function : Int_lpc_1to3
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* Purpose : Interpolates the LSPs and converts to LPC parameters
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* to get a different LP filter in each subframe.
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* Description : The 20 ms speech frame is divided into 4 subframes.
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* The LSPs are quantized and transmitted at the 4th
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* subframes (once per frame) and interpolated at the
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* 1st, 2nd and 3rd subframe.
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*
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* |------|------|------|------|
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* sf1 sf2 sf3 sf4
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* F0 F1
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*
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* sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
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* sf2: 1/2 F0 + 1/2 F1 sf4: F1
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* Returns : void
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*
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**************************************************************************
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*/
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void Int_lpc_1to3(
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Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */
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Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */
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Word16 Az[], /* o : interpolated LP parameters in all SFs (AZ_SIZE) */
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Flag *pOverflow
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);
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/*
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**************************************************************************
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*
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* Function : Int_lpc_1to3_2
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* Purpose : Interpolation of the LPC parameters. Same as the Int_lpc
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* function but we do not recompute Az() for subframe 4
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* because it is already available.
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* Returns : void
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*
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**************************************************************************
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*/
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void Int_lpc_1to3_2(
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Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */
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Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */
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Word16 Az[], /* o :interpolated LP parameters in SFs 1, 2, 3
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(AZ_SIZE) */
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Flag *pOverflow
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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 /* _INT_LPC_H_ */
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