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author | Andreas Huber <andih@google.com> | 2009-12-07 09:56:32 -0800 |
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committer | Andreas Huber <andih@google.com> | 2009-12-07 11:02:28 -0800 |
commit | dacaa73ae5010b66f4224d70a520945e5b653544 (patch) | |
tree | a2c9e71b6337dd25d149bd5fa43f7a782e9387fb /media/libstagefright/codecs/aacdec/deinterleave.cpp | |
parent | 5921fb51e0219ddd7cad439a73495f320c57d50e (diff) | |
download | frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.zip frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.tar.gz frameworks_base-dacaa73ae5010b66f4224d70a520945e5b653544.tar.bz2 |
Initial check in of stagefright software AAC decoder based on PV source code.
Diffstat (limited to 'media/libstagefright/codecs/aacdec/deinterleave.cpp')
-rw-r--r-- | media/libstagefright/codecs/aacdec/deinterleave.cpp | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/deinterleave.cpp b/media/libstagefright/codecs/aacdec/deinterleave.cpp new file mode 100644 index 0000000..5298b19 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/deinterleave.cpp @@ -0,0 +1,287 @@ +/* ------------------------------------------------------------------ + * 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 */ |