| /* ------------------------------------------------------------------ |
| * 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/pstfilt.h |
| |
| Date: 02/05/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| File : pstfilt.h |
| Purpose : Performs adaptive postfiltering on the synthesis |
| : speech |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef _PSTFILT_H_ |
| #define _PSTFILT_H_ |
| #define pstfilt_h "$Id $" |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "typedef.h" |
| #include "mode.h" |
| #include "cnst.h" |
| #include "preemph.h" |
| #include "agc.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 res2[L_SUBFR]; |
| Word16 mem_syn_pst[M]; |
| preemphasisState preemph_state; |
| agcState agc_state; |
| Word16 synth_buf[M + L_FRAME]; |
| } Post_FilterState; |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; [List function prototypes here] |
| ----------------------------------------------------------------------------*/ |
| Word16 Post_Filter_reset(Post_FilterState *st); |
| /* reset post filter (i.e. set state memory to zero) |
| returns 0 on success |
| */ |
| |
| void Post_Filter( |
| Post_FilterState *st, /* i/o : post filter states */ |
| enum Mode mode, /* i : AMR mode */ |
| Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */ |
| Word16 *Az_4, /* i : interpolated LPC parameters in all subfr. */ |
| Flag *pOverflow |
| ); |
| /* filters the signal syn using the parameters in Az_4 to calculate filter |
| coefficients. |
| The filter must be set up using Post_Filter_init prior to the first call |
| to Post_Filter. Post_FilterState is updated to mirror the current state |
| of the filter |
| |
| return 0 on success |
| */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _PSTFILT_H_ */ |
| |
| |
| |