| /* ------------------------------------------------------------------ |
| * 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/levinson.h |
| |
| Date: 01/29/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| Description: 1. Modified "int" definition by Word16 |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| File : lag_wind.h |
| Purpose : Lag windowing of autocorrelations. |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef _LEVINSON_H_ |
| #define _LEVINSON_H_ |
| #define levinson_h "$Id $" |
| |
| /*---------------------------------------------------------------------------- |
| ; 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.] |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL VARIABLES REFERENCES |
| ; [Declare variables used in this module but defined elsewhere] |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| typedef struct |
| { |
| Word16 old_A[M + 1]; /* Last A(z) for case of unstable filter */ |
| } LevinsonState; |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; [List function prototypes here] |
| ----------------------------------------------------------------------------*/ |
| Word16 Levinson_init(LevinsonState **st); |
| /* initialize one instance of the pre processing state. |
| Stores pointer to filter status struct in *st. This pointer has to |
| be passed to Levinson in each call. |
| returns 0 on success |
| */ |
| |
| Word16 Levinson_reset(LevinsonState *st); |
| /* reset of pre processing state (i.e. set state memory to zero) |
| returns 0 on success |
| */ |
| void Levinson_exit(LevinsonState **st); |
| /* de-initialize pre processing state (i.e. free status struct) |
| stores NULL in *st |
| */ |
| |
| Word16 Levinson( |
| LevinsonState *st, |
| Word16 Rh[], /* i : Rh[m+1] Vector of autocorrelations (msb) */ |
| Word16 Rl[], /* i : Rl[m+1] Vector of autocorrelations (lsb) */ |
| Word16 A[], /* o : A[m] LPC coefficients (m = 10) */ |
| Word16 rc[], /* o : rc[4] First 4 reflection coefficients */ |
| Flag *pOverflow |
| ); |
| |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _LEVINSON_H_ */ |
| |
| |
| |
| |
