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Diffstat (limited to 'opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/l_abs.cpp')
-rw-r--r-- | opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/l_abs.cpp | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/l_abs.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/l_abs.cpp new file mode 100644 index 0000000..eed4fc3 --- /dev/null +++ b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/l_abs.cpp @@ -0,0 +1,160 @@ +/* ------------------------------------------------------------------ + * 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: l_abs.cpp + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + Inputs: + L_var1 = 32 bit long signed integer (Word32 ) whose value falls + in the range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. + + Local Stores/Buffers/Pointers Needed: + None + + Global Stores/Buffers/Pointers Needed: + None + + Outputs: + L_var1 = absolute value of input (Word32) + + Pointers and Buffers Modified: + None + + Local Stores Modified: + None + + Global Stores Modified: + None + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + This function calculates the absolute value of L_var1; saturate in case + where the input is -214783648. + +------------------------------------------------------------------------------ + REQUIREMENTS + + None + +------------------------------------------------------------------------------ + REFERENCES + + [1] basicop2.c, ETS Version 2.0.0, February 8, 1999 + +------------------------------------------------------------------------------ + PSEUDO-CODE + +Word32 L_abs (Word32 L_var1) +{ + Word32 L_var_out; + + if (L_var1 == MIN_32) + { + L_var_out = MAX_32; + } + else + { + if (L_var1 < 0) + { + L_var_out = -L_var1; + } + else + { + L_var_out = L_var1; + } + } + +#if (WMOPS) + multiCounter[currCounter].L_abs++; +#endif + return (L_var_out); +} + + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "l_abs.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_abs(Word32 L_var1) +{ + /*---------------------------------------------------------------------------- + ; Define all local variables + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; Function body here + ----------------------------------------------------------------------------*/ + + Word32 y = L_var1 - (L_var1 < 0); + y = y ^(y >> 31); + return (y); + +} |