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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/include/int_lpc.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/include/int_lpc.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/include/int_lpc.h b/media/libstagefright/codecs/amrnb/common/include/int_lpc.h new file mode 100644 index 0000000..e95e6ca --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/include/int_lpc.h @@ -0,0 +1,212 @@ +/* ------------------------------------------------------------------ + * 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/include/lsp_avg.h + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Placed header file in the proper template format. Added + parameter pOverflow for the basic math ops. + + Description: Moved _cplusplus #ifdef after Include section. + + Who: Date: + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + This file contains all the constant definitions and prototype definitions + needed by the lsp_avg.c + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; CONTINUE ONLY IF NOT ALREADY DEFINED +----------------------------------------------------------------------------*/ +#ifndef int_lpc_h +#define int_lpc_h "$Id $" + +/*---------------------------------------------------------------------------- +; 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 + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; Function Prototype declaration + ----------------------------------------------------------------------------*/ + + /* + ************************************************************************** + * + * Function : Int_lpc_1and3 + * Purpose : Interpolates the LSPs and converts to LPC parameters + * to get a different LP filter in each subframe. + * Description : The 20 ms speech frame is divided into 4 subframes. + * The LSPs are quantized and transmitted at the 2nd and + * 4th subframes (twice per frame) and interpolated at the + * 1st and 3rd subframe. + * + * |------|------|------|------| + * sf1 sf2 sf3 sf4 + * F0 Fm F1 + * + * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm + * sf2: Fm sf4: F1 + * Returns : void + * + ************************************************************************** + */ + void Int_lpc_1and3( + Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ + Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of + present frame (M) */ + Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of + present frame (M) */ + Word16 Az[], /* o : interpolated LP parameters in all subfr. + (AZ_SIZE) */ + Flag *pOverflow + ); + + /* + ************************************************************************** + * + * Function : Int_lpc_1and3_2 + * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc + * function but we do not recompute Az() for subframe 2 and + * 4 because it is already available. + * Returns : void + * + ************************************************************************** + */ + void Int_lpc_1and3_2( + Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ + Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of + present frame (M) */ + Word16 lsp_new[], /* i : LSP vector at the 4th subframe of + present frame (M) */ + Word16 Az[], /* o :interpolated LP parameters + in subframes 1 and 3 (AZ_SIZE) */ + Flag *pOverflow + ); + + /* + ************************************************************************** + * + * Function : Int_lpc_1to3 + * Purpose : Interpolates the LSPs and converts to LPC parameters + * to get a different LP filter in each subframe. + * Description : The 20 ms speech frame is divided into 4 subframes. + * The LSPs are quantized and transmitted at the 4th + * subframes (once per frame) and interpolated at the + * 1st, 2nd and 3rd subframe. + * + * |------|------|------|------| + * sf1 sf2 sf3 sf4 + * F0 F1 + * + * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 + * sf2: 1/2 F0 + 1/2 F1 sf4: F1 + * Returns : void + * + ************************************************************************** + */ + void Int_lpc_1to3( + Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ + Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */ + Word16 Az[], /* o : interpolated LP parameters in all SFs (AZ_SIZE) */ + Flag *pOverflow + ); + + /* + ************************************************************************** + * + * Function : Int_lpc_1to3_2 + * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc + * function but we do not recompute Az() for subframe 4 + * because it is already available. + * Returns : void + * + ************************************************************************** + */ + void Int_lpc_1to3_2( + Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ + Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */ + Word16 Az[], /* o :interpolated LP parameters in SFs 1, 2, 3 + (AZ_SIZE) */ + Flag *pOverflow + ); + + /*---------------------------------------------------------------------------- + ; END + ----------------------------------------------------------------------------*/ +#ifdef __cplusplus +} +#endif + +#endif /* _INT_LPC_H_ */ + + |