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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/include/mult.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/include/mult.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/include/mult.h b/media/libstagefright/codecs/amrnb/common/include/mult.h new file mode 100644 index 0000000..6927eba --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/include/mult.h @@ -0,0 +1,190 @@ +/* ------------------------------------------------------------------ + * 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/mult.h + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Created separate header file for mult function. + + Description: Changed prototype of the mult() function. Instead of using global + a pointer to overflow flag is now passed into the function. + + Description: Updated copyright information. + Updated variable name from "overflow" to "pOverflow" to match + with original function declaration. + + Description: Moved _cplusplus #ifdef after Include section. + + Description: Providing support for ARM and Linux-ARM assembly instructions. + + Who: Date: + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + This file contains all the constant definitions and prototype definitions + needed by the mult function. + +------------------------------------------------------------------------------ +*/ + +#ifndef MULT_H +#define MULT_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 + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; SIMPLE TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; ENUMERATED TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; STRUCTURES TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; Function Prototype declaration + ----------------------------------------------------------------------------*/ +#if defined(PV_ARM_V5) + + __inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) + { + Word32 product; + + OSCL_UNUSED_ARG(pOverflow); + + __asm + { + SMULBB product, var1, var2 + MOV product, product, ASR #15 + CMP product, 0x7FFF + MOVGE product, 0x7FFF + } + + return ((Word16) product); + } + +#elif defined(PV_ARM_GCC_V5) + + __inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) + { + register Word32 ra = var1; + register Word32 rb = var2; + Word32 product; + Word32 temp = 0x7FFF; + + OSCL_UNUSED_ARG(pOverflow); + + asm volatile("smulbb %0, %1, %2" + : "=r"(product) + : "r"(ra), "r"(rb) + ); + asm volatile("mov %0, %1, ASR #15" + : "=r"(product) + : "r"(product) + ); + asm volatile("cmp %0, %1" + : "=r"(product) + : "r"(temp) + ); + asm volatile("movge %0, %1" + : "=r"(product) + : "r"(temp) + ); + + return ((Word16) product); + } + +#else /* C EQUIVALENT */ + + static inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) + { + register Word32 product; + + product = ((Word32) var1 * var2) >> 15; + + /* Saturate result (if necessary). */ + /* var1 * var2 >0x00007fff is the only case */ + /* that saturation occurs. */ + + if (product > 0x00007fffL) + { + *pOverflow = 1; + product = (Word32) MAX_16; + } + + + /* Return the product as a 16 bit value by type casting Word32 to Word16 */ + + return ((Word16) product); + } + +#endif + /*---------------------------------------------------------------------------- + ; END + ----------------------------------------------------------------------------*/ +#ifdef __cplusplus +} +#endif + +#endif /* _MULT_H_ */ + |