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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/src/sub.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/src/sub.cpp | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/src/sub.cpp b/media/libstagefright/codecs/amrnb/common/src/sub.cpp deleted file mode 100644 index d936128..0000000 --- a/media/libstagefright/codecs/amrnb/common/src/sub.cpp +++ /dev/null @@ -1,218 +0,0 @@ -/* ------------------------------------------------------------------ - * 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/src/sub.c - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Created separate file for the sub function. Sync'ed up with the - current template and fixed tabs. - - Description: Changed all occurrences of L_diff to diff, deleted "short" in - the definition of var1 and var2, and fixed the range values. - - Description: Changed function prototype passing in a pointer to overflow flag - instead of using global data. - - Description: Changes made per formal review comments. - 1. Changed the parameter name fron "overflow" to "pOverflow" - 2. Updated template - 3. Updated reference section - - Description: Removed conditional code that updates WMOPS counter - - Description: - 1. Modified if-else structure to save cycles by processing - the most common case faster. - - Who: Date: - Description: - ------------------------------------------------------------------------------- - MODULE DESCRIPTION - - Subtraction function with overflow control - ------------------------------------------------------------------------------- -*/ - -/*---------------------------------------------------------------------------- -; INCLUDES -----------------------------------------------------------------------------*/ -#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 -; [List function prototypes here] -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL VARIABLE DEFINITIONS -; [Variable declaration - defined here and used outside this module] -----------------------------------------------------------------------------*/ - - -/* ------------------------------------------------------------------------------- - FUNCTION NAME: sub ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - var1 = 16 bit short signed integer (Word16) whose value falls in - the range : 0xffff 8000 <= var1 <= 0x0000 7fff. - - var2 = 16 bit short signed integer (Word16) whose value falls in - the range : 0xffff 8000 <= var2 <= 0x0000 7fff. - - pOverflow = pointer to overflow (Flag) - - Outputs: - pOverflow -> 1 if the subtract operation resulted in overflow - - Returns: - diff = 16-bit limited difference between var1 and var2 (Word16) - - Global Variables Used: - None - - Local Variables Needed: - None - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This function performs the subtraction (var1-var2) with overflow control and - saturation; the 16 bit result is set at +32767 when overflow occurs or at - -32768 when underflow occurs. - ------------------------------------------------------------------------------- - REQUIREMENTS - - None - ------------------------------------------------------------------------------- - REFERENCES - - [1] sub() function in basicop2.c, UMTS GSM AMR speech codec, R99 - - Version 3.2.0, March 2, 2001 - ------------------------------------------------------------------------------- - - PSEUDO-CODE - - Word16 sub (Word16 var1, Word16 var2) - { - Word16 var_out; - Word32 diff; - - diff = (Word32) var1 - var2; - -* The reference ETSI code uses a global flag for Overflow inside the function -* saturate(). In the actual implementation a pointer to Overflow flag is passed -* in as a parameter to the function - - var_out = saturate (diff); - - #if (WMOPS) - multiCounter[currCounter].sub++; - #endif - - return (var_out); - } - ------------------------------------------------------------------------------- - RESOURCES USED [optional] - - When the code is written for a specific target processor the - the resources used should be documented below. - - HEAP MEMORY USED: x bytes - - STACK MEMORY USED: x bytes - - CLOCK CYCLES: (cycle count equation for this function) + (variable - used to represent cycle count for each subroutine - called) - where: (cycle count variable) = cycle count for [subroutine - name] - ------------------------------------------------------------------------------- - CAUTION [optional] - [State any special notes, constraints or cautions for users of this function] - ------------------------------------------------------------------------------- -*/ - -/*---------------------------------------------------------------------------- -; FUNCTION CODE -----------------------------------------------------------------------------*/ - -Word16 sub(Word16 var1, Word16 var2, Flag *pOverflow) -{ - - Word32 diff; - - diff = (Word32) var1 - var2; - - /* Saturate result (if necessary). */ - /* Replaced function call with in-line code */ - /* to conserve MIPS, i.e., var_out = saturate (diff) */ - - - if ((UWord32)(diff - 0xFFFF8000L) > 0x000FFFF) - { - if (diff > (Word32) 0x0007FFFL) - { - diff = MAX_16; - } - else - { - diff = MIN_16; - } - - *pOverflow = 1; - } - - - return ((Word16) diff); -} |