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diff --git a/media/libstagefright/codecs/aacdec/getmask.cpp b/media/libstagefright/codecs/aacdec/getmask.cpp
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-/* ------------------------------------------------------------------
- * 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.
- * -------------------------------------------------------------------
- */
-/*
-
- Pathname: getmask.c
-
-------------------------------------------------------------------------------
- REVISION HISTORY
-
- Description: Modified from original shareware code
-
- Description: Modified to pass variables by reference to eliminate use
- of global variables.
- Replaced for-loop style memory initialization with memset()
-
- Description: (1) Modified to bring code in-line with PV standard
- (2) Removed multiple returns, Replaced multiple 'if's with
- switch
-
- Description: (1) Modified per review comments
- (2) increment pointer pMask after memset
-
- Description: Make the maximum number of bits requested from getbits
- become a constant.
-
- Description: Typecast 1 to UInt32 for bitmask to avoid masking on a 16-bit
- platform
-
- Description: Replace some instances of getbits to get9_n_lessbits
- when the number of bits read is 9 or less.
-
- Who: Date: MM/DD/YYYY
- Description:
-
-------------------------------------------------------------------------------
- INPUT AND OUTPUT DEFINITIONS
-
- Inputs:
- pFrameInfo = pointer to structure that holds information for current
- frame, Type FrameInfo
-
- pInputStream= pointer to structure that holds input stream information
- Type BITS
-
- pGroup = pointer to array that holds the stop window index for
- each group in current frame, Type Int
-
- max_sfb = number of active sfbs for each window, Type Int
-
- mask[] = array that holds the MS_mask information
- Type Int
-
- Local Stores/Buffers/Pointers Needed:
- None
-
- Global Stores/Buffers/Pointers Needed:
- None
-
- Outputs:
- mask_present = 0 (no Mid/Side mixed)
- 2 (Mid/Side mixed present for entire frame)
- 1 (Mid/Side mixed information read from bitstream)
- -1 (invalid mask_present read from bitstream)
-
- Pointers and Buffers Modified:
- pMask contents replaced by MS information of each scalefactor band
-
- Local Stores Modified:
- None
-
- Global Stores Modified:
- None
-
-------------------------------------------------------------------------------
- FUNCTION DESCRIPTION
-
- This function reads the Mid/Side(MS) mask information from the input
- bitstream. If the mask_present field is equal to 2, the mask bits is set to
- 1 for the entire frame. If mask_present has a value of 0, the function
- returns 0, If mask_present is set to 1, the Mid/Side(MS) information is
- read from the input stream. When mask_present is 3, an error code (-1) is
- generated.
- The Mid/Side(MS) information is later used for mixing the left and right
- channel sounds. Each scalefactor band has its own MS information.
-
- (ISO comments: read a synthesis mask, read a synthesis mask uses
- EXTENDED_MS_MASK and grouped mask )
-
-------------------------------------------------------------------------------
- REQUIREMENTS
-
- This function shall replace the contents of pMask with the MS information
- of each scalefactor band
-
-------------------------------------------------------------------------------
- REFERENCES
-
- (1) MPEG-2 NBC Audio Decoder
- "This software module was originally developed by AT&T, Dolby
- Laboratories, Fraunhofer Gesellschaft IIS in the course of development
- of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and
- 3. This software module is an implementation of a part of one or more
- MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4
- Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio
- standards free license to this software module or modifications thereof
- for use in hardware or software products claiming conformance to the
- MPEG-2 NBC/MPEG-4 Audio standards. Those intending to use this software
- module in hardware or software products are advised that this use may
- infringe existing patents. The original developer of this software
- module and his/her company, the subsequent editors and their companies,
- and ISO/IEC have no liability for use of this software module or
- modifications thereof in an implementation. Copyright is not released
- for non MPEG-2 NBC/MPEG-4 Audio conforming products.The original
- developer retains full right to use the code for his/her own purpose,
- assign or donate the code to a third party and to inhibit third party
- from using the code for non MPEG-2 NBC/MPEG-4 Audio conforming products.
- This copyright notice must be included in all copies or derivative
- works."
- Copyright(c)1996.
-
- (2) ISO/IEC 14496-3: 1999(E)
- Subpart 4
- p15 (Table 4.4.5 getmask)
-
-------------------------------------------------------------------------------
- PSEUDO-CODE
-
- CALL getbits(LEN_MASK_PRES, pInputStream)
- MODIFYING (pInputStream)
- RETURNING (mask present information)
- mask_present = mask present information
-
- SWITCH (mask_present)
-
- CASE (0):
- BREAK;
-
- CASE (2):
- nwin = pFrameInfo->num_win;
- FOR(win = 0; win < nwin; win = *(pGroup++))
-
- FOR(sfb = pFrameInfo->sfb_per_win[win]; sfb > 0; sfb--)
- *(pMask++) = 1;
- ENDFOR
-
- ENDFOR
-
- BREAK;
-
- CASE(1):
-
- nwin = pFrameInfo->num_win;
-
- nToDo = max_sfb;
-
- WHILE (nToDo > 0)
- nCall = nToDo;
-
- IF (nCall > MAX_GETBITS)
- THEN
- nCall = MAX_GETBITS;
- ENDIF
-
- tempMask =
- getbits(
- nCall,
- pInputStream);
-
- bitmask = 1 << (nCall - 1);
- FOR (sfb = nCall; sfb > 0; sfb--)
- *(pMask++) = (tempMask & bitmask) >> (sfb - 1);
- bitmask >>= 1;
- ENDFOR
-
- nToDo -= nCall;
- END WHILE
-
- pv_memset(
- pMask,
- 0,
- (pFrameInfo->sfb_per_win[win]-max_sfb)*sizeof(*pMask));
-
- ENDFOR (win)
-
- BREAK
-
- DEFAULT:
- mask_present = -1
-
- ENDSWITCH
-
- RETURN mask_present
-
-------------------------------------------------------------------------------
-*/
-
-
-/*----------------------------------------------------------------------------
-; INCLUDES
-----------------------------------------------------------------------------*/
-#include "pv_audio_type_defs.h"
-#include "huffman.h"
-#include "aac_mem_funcs.h"
-#include "e_maskstatus.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
-----------------------------------------------------------------------------*/
-Int getmask(
- FrameInfo *pFrameInfo,
- BITS *pInputStream,
- Int group[],
- Int max_sfb,
- Int mask[])
-{
-
- Int win; /* window index */
- Int sfb;
- Int mask_present;
- Int *pMask;
- Int *pGroup;
- Int nwin;
- Int nCall;
- Int nToDo;
- UInt32 tempMask;
- UInt32 bitmask;
-
- pMask = mask;
- pGroup = group;
-
- mask_present =
- get9_n_lessbits(
- LEN_MASK_PRES,
- pInputStream);
-
- switch (mask_present)
- {
- case(MASK_NOT_PRESENT):
- /* special EXTENDED_MS_MASK cases */
- /* no ms at all */
- break;
-
- case(MASK_ALL_FRAME):
- /* MS for whole spectrum on, mask bits set to 1 */
- nwin = pFrameInfo->num_win;
- for (win = 0; win < nwin; win = *(pGroup++))
- {
- for (sfb = pFrameInfo->sfb_per_win[win]; sfb > 0; sfb--)
- {
- *(pMask++) = 1; /* cannot use memset for Int type */
- }
-
- }
-
- break;
-
- case(MASK_FROM_BITSTREAM):
- /* MS_mask_present==1, get mask information*/
- nwin = pFrameInfo->num_win;
- for (win = 0; win < nwin; win = *(pGroup++))
- {
- /*
- * the following code is equivalent to
- *
- * for(sfb = max_sfb; sfb > 0; sfb--)
- * {
- * *(pMask++) =
- * getbits(
- * LEN_MASK,
- * pInputStream);
- * }
- *
- * in order to save the calls to getbits, the above
- * for-loop is broken into two parts
- */
-
- nToDo = max_sfb;
-
- while (nToDo > 0)
- {
- nCall = nToDo;
-
- if (nCall > MAX_GETBITS)
- {
- nCall = MAX_GETBITS;
- }
-
- tempMask =
- getbits(
- nCall,
- pInputStream);
-
- bitmask = (UInt32) 1 << (nCall - 1);
- for (sfb = nCall; sfb > 0; sfb--)
- {
- *(pMask++) = (Int)((tempMask & bitmask) >> (sfb - 1));
- bitmask >>= 1;
- }
-
- nToDo -= nCall;
- }
-
- /*
- * set remaining sfbs to zero
- * re-use nCall to save one variable on stack
- */
-
- nCall = pFrameInfo->sfb_per_win[win] - max_sfb;
-
-
- if (nCall >= 0)
- {
- pv_memset(pMask,
- 0,
- nCall*sizeof(*pMask));
-
- pMask += nCall;
- }
- else
- {
- mask_present = MASK_ERROR;
- break;
- }
-
-
- } /* for (win) */
-
- break;
-
- default:
- /* error */
- break;
-
- } /* switch (mask_present) */
-
- return mask_present;
-
-} /* getmask */
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