| /* ------------------------------------------------------------------ |
| * 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/add.h |
| |
| |
| |
| |
| Date: 08/11/2000 |
| |
| |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: Created separate header file for add function. |
| |
| Description: Changed function prototype; pointer to overflow flag is passed |
| in as a parameter. |
| |
| Description: Updated copyright section. |
| Changed "overflow" to "pOverflow" in the function prototype. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: |
| |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| This file contains all the constant definitions and prototype definitions |
| needed by the comfort noise(CN) generator functions |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef B_CN_COD_H |
| #define B_CN_COD_H |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "basicop_malloc.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 |
| ----------------------------------------------------------------------------*/ |
| extern Word16 window_200_40[]; |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| |
| ; FUNCTION NAME: pseudonoise |
| ; |
| ; PURPOSE: Generate a random integer value to use in comfort noise |
| ; generation. The algorithm uses polynomial x^31 + x^3 + 1 |
| ; (length of PN sequence is 2^31 - 1). |
| ; |
| ----------------------------------------------------------------------------*/ |
| |
| Word16 pseudonoise( |
| Word32 *pShift_reg, /* i/o : Old CN generator shift register state */ |
| Word16 no_bits /* i : Number of bits */ |
| ); |
| |
| /*---------------------------------------------------------------------------- |
| |
| ; FUNCTION NAME: build_CN_code |
| ; |
| ; PURPOSE: Compute the comfort noise fixed codebook excitation. The |
| ; gains of the pulses are always +/-1. |
| ; |
| ----------------------------------------------------------------------------*/ |
| |
| void build_CN_code( |
| Word32 *pSeed, /* i/o : Old CN generator shift register state */ |
| Word16 cod[], /* o : Generated CN fixed codebook vector */ |
| Flag *pOverflow /* i/o : Overflow flag */ |
| ); |
| |
| /*---------------------------------------------------------------------------- |
| |
| ; FUNCTION NAME: build_CN_param |
| ; |
| ; PURPOSE: Randomize the speech parameters. So that they |
| ; do not produce tonal artifacts if used by ECU. |
| ; |
| ----------------------------------------------------------------------------*/ |
| |
| void build_CN_param( |
| Word16 *pSeed, /* i/o : Old CN generator shift register state */ |
| const Word16 n_param, /* i : number of params */ |
| const Word16 param_size_table[], /* i : size of params */ |
| Word16 parm[], /* o : CN Generated params */ |
| Flag *pOverflow /* i/o : Overflow Flag */ |
| ); |
| |
| /*---------------------------------------------------------------------------- |
| ; END |
| ----------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _B_CN_COD_H_ */ |
| |
