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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/b_cn_cod.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/b_cn_cod.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/b_cn_cod.h b/media/libstagefright/codecs/amrnb/dec/src/b_cn_cod.h new file mode 100644 index 0000000..743237c --- /dev/null +++ b/media/libstagefright/codecs/amrnb/dec/src/b_cn_cod.h @@ -0,0 +1,171 @@ +/* ------------------------------------------------------------------ + * 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_ */ + |