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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: ./src/deinterleave.c
------------------------------------------------------------------------------
REVISION HISTORY
Description: Modified from original shareware code
Description: (1) Modified with new template, rename variables
(2) Removed for-loop to calculate win_inc, win_inc = SN2 (128)
(3) Replaced for-loop with memcpy
(4) Converted Int16 -> Int
Description: Modified per review comments
Who: Date:
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
interleaved = input array that contains interleaved coefficients
Data Type Int
deinterleaved = output array that will be updated with de-interleaved
coefficients of input array. Data Type Int
pFrameInfo = pointer to structure that holds information of current
frame. Data Type FrameInfo
Local Stores/Buffers/Pointers Needed:
None
Global Stores/Buffers/Pointers Needed:
None
Outputs:
None
Pointers and Buffers Modified:
deinterleaved contents updated with de-interleaved coefficients from
the input array: interleaved
Local Stores Modified:
None
Global Stores Modified:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function performs the deinterleaving across all short windows in
each group
------------------------------------------------------------------------------
REQUIREMENTS
This function should replace the contents of pDeinterleaved with the
de-interleaved 1024 coefficients of one frame
------------------------------------------------------------------------------
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 p78 quant_to_spec
------------------------------------------------------------------------------
PSEUDO-CODE
pInterleaved = interleaved;
pDeinterleaved = deinterleaved;
pSfbPerWin = pFrameInfo->sfb_per_win;
ngroups = pFrameInfo->num_groups;
pGroupLen = pFrameInfo->group_len;
pGroup = pDeinterleaved;
FOR (group = ngroups; group > 0; group--)
pSfbWidth = pFrameInfo->sfb_width_128;
sfb_inc = 0;
pStart = pInterleaved;
FOR (sfb = pSfbPerWin[ngroups-group]; sfb > 0; sfb--)
pWin = pGroup;
FOR (win = pGroupLen[ngroups-group]; win > 0; win--)
pDeinterleaved = pWin + sfb_inc;
pv_memcpy(
pDeinterleaved,
pInterleaved,
*pSfbWidth*sizeof(*pInterleaved));
pInterleaved += *pSfbWidth;
pWin += SN2;
ENDFOR (win)
sfb_inc += *pSfbWidth++;
ENDFOR (sfb)
pGroup += (pInterleaved - pStart);
ENDFOR (group)
------------------------------------------------------------------------------
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 "pv_audio_type_defs.h"
#include "huffman.h"
#include "aac_mem_funcs.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
----------------------------------------------------------------------------*/
void deinterleave(
Int16 interleaved[],
Int16 deinterleaved[],
FrameInfo *pFrameInfo)
{
Int group; /* group index */
Int sfb; /* scalefactor band index */
Int win; /* window index */
Int16 *pGroup;
Int16 *pWin;
Int16 *pStart;
Int16 *pInterleaved;
Int16 *pDeinterleaved;
Int sfb_inc;
Int ngroups;
Int *pGroupLen;
Int *pSfbPerWin;
Int *pSfbWidth;
pInterleaved = interleaved;
pDeinterleaved = deinterleaved;
pSfbPerWin = pFrameInfo->sfb_per_win;
ngroups = pFrameInfo->num_groups;
pGroupLen = pFrameInfo->group_len;
pGroup = pDeinterleaved;
for (group = ngroups; group > 0; group--)
{
pSfbWidth = pFrameInfo->sfb_width_128;
sfb_inc = 0;
pStart = pInterleaved;
/* Perform the deinterleaving across all windows in a group */
for (sfb = pSfbPerWin[ngroups-group]; sfb > 0; sfb--)
{
pWin = pGroup;
for (win = pGroupLen[ngroups-group]; win > 0; win--)
{
pDeinterleaved = pWin + sfb_inc;
pv_memcpy(
pDeinterleaved,
pInterleaved,
*pSfbWidth*sizeof(*pInterleaved));
pInterleaved += *pSfbWidth;
pWin += SN2;
} /* for (win) */
sfb_inc += *pSfbWidth++;
} /* for (sfb) */
pGroup += (pInterleaved - pStart);
} /* for (group) */
} /* deinterleave */
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