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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/g_adapt.h')
-rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/g_adapt.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/g_adapt.h b/media/libstagefright/codecs/amrnb/enc/src/g_adapt.h new file mode 100644 index 0000000..2ea508b --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/g_adapt.h @@ -0,0 +1,159 @@ +/* ------------------------------------------------------------------ + * 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/g_adapt.h + + Date: 02/05/2002 + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Placed header file in the proper template format. Added + parameter pOverflow for the basic math ops. + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: Moved _cplusplus #ifdef after Include section. + + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + This file contains all the constant definitions and prototype definitions + needed by the file, g_adapt.c + +------------------------------------------------------------------------------ +*/ + +/*---------------------------------------------------------------------------- +; CONTINUE ONLY IF NOT ALREADY DEFINED +----------------------------------------------------------------------------*/ +#ifndef g_adapt_h +#define g_adapt_h "$Id $" + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" + +/*--------------------------------------------------------------------------*/ +#ifdef __cplusplus +extern "C" +{ +#endif + + /*---------------------------------------------------------------------------- + ; MACROS + ; Define module specific macros here + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; DEFINES + ; Include all pre-processor statements here. + ----------------------------------------------------------------------------*/ +#define LTPG_MEM_SIZE 5 /* number of stored past LTP coding gains + 1 */ + + /*---------------------------------------------------------------------------- + ; EXTERNAL VARIABLES REFERENCES + ; Declare variables used in this module but defined elsewhere + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; SIMPLE TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; ENUMERATED TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; STRUCTURES TYPEDEF'S + ----------------------------------------------------------------------------*/ + typedef struct + { + Word16 onset; /* onset state, Q0 */ + Word16 prev_alpha; /* previous adaptor output, Q15 */ + Word16 prev_gc; /* previous code gain, Q1 */ + + Word16 ltpg_mem[LTPG_MEM_SIZE]; /* LTP coding gain history, Q13 */ + /* (ltpg_mem[0] not used for history) */ + } GainAdaptState; + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; Function Prototype declaration + ----------------------------------------------------------------------------*/ + Word16 gain_adapt_init(GainAdaptState **st); + /* initialize one instance of the gain adaptor + Stores pointer to state struct in *st. This pointer has to + be passed to gain_adapt and gain_adapt_update in each call. + returns 0 on success + */ + + Word16 gain_adapt_reset(GainAdaptState *st); + /* reset of gain adaptor state (i.e. set state memory to zero) + returns 0 on success + */ + + void gain_adapt_exit(GainAdaptState **st); + /* de-initialize gain adaptor state (i.e. free state struct) + stores NULL in *st + */ + + /************************************************************************* + * + * Function: gain_adapt() + * Purpose: calculate pitch/codebook gain adaptation factor alpha + * (and update the adaptor state) + * + ************************************************************************** + */ + void gain_adapt( + GainAdaptState *st, /* i : state struct */ + Word16 ltpg, /* i : ltp coding gain (log2()), Q */ + Word16 gain_cod, /* i : code gain, Q13 */ + Word16 *alpha, /* o : gain adaptation factor, Q15 */ + Flag *pOverflow /* o : overflow indicator */ + ); + + /*---------------------------------------------------------------------------- + ; END + ----------------------------------------------------------------------------*/ +#ifdef __cplusplus +} +#endif + +#endif /* _H_ */ + + |