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Diffstat (limited to 'media/libstagefright/codecs/amrnb/enc/src/l_comp.cpp')
-rw-r--r-- | media/libstagefright/codecs/amrnb/enc/src/l_comp.cpp | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/enc/src/l_comp.cpp b/media/libstagefright/codecs/amrnb/enc/src/l_comp.cpp new file mode 100644 index 0000000..64be4dd --- /dev/null +++ b/media/libstagefright/codecs/amrnb/enc/src/l_comp.cpp @@ -0,0 +1,162 @@ +/* ------------------------------------------------------------------ + * 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. +****************************************************************************************/ +/* +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + hi = 16 bit signed integer (Word16) whose value falls in + the range : 0x8000 <= hi <= 0x7fff. + lo = 16 bit signed integer (Word16) whose value falls in + the range : 0x8000 <= lo <= 0x7fff. + + Outputs: + pOverflow = 1 if overflow happens in a math function called by this function. + L_out = 32-bit result of (hi<<16 + lo<<1). + + Returns: + None + + Local Stores Modified: + None + + Global Stores Modified: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This function composes a 32 bit integer from two 16 bit double precision + format (DPF) numbers hi and lo by the following operation: + 1. Deposit hi into the 16 MS bits of the 32 bit output L_out. + 2. Shift lo left by 1. + 3. Add results from 1 and 2 with saturation to return the 32 bit result + L_out. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + [1] oper_32b.c, ETS Version 2.0.0, February 8, 1999 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ + RESOURCES USED + When the code is written for a specific target processor the + the resources used should be documented below. + + STACK USAGE: [stack count for this module] + [variable to represent + stack usage for each subroutine called] + + where: [stack usage variable] = stack usage for [subroutine + name] (see [filename].ext) + + DATA MEMORY USED: x words + + PROGRAM MEMORY USED: x words + + CLOCK CYCLES: [cycle count equation for this module] + [variable + used to represent cycle count for each subroutine + called] + + where: [cycle count variable] = cycle count for [subroutine + name] (see [filename].ext) + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" +#include "l_comp.h" +#include "basic_op.h" +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + +Word32 L_Comp(Word16 hi, Word16 lo, Flag *pOverflow) +{ + + /*---------------------------------------------------------------------------- + ; Define all local variables + ----------------------------------------------------------------------------*/ + Word32 L_32; + Word32 temp32; + /*---------------------------------------------------------------------------- + ; Function body here + ----------------------------------------------------------------------------*/ + + L_32 = L_deposit_h(hi); + + temp32 = L_mac(L_32, lo, 1, pOverflow); + /*---------------------------------------------------------------------------- + ; Return nothing or data or data pointer + ----------------------------------------------------------------------------*/ + + return (temp32); /* = hi<<16 + lo<<1 */ +} |