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Diffstat (limited to 'media/libstagefright/codecs/aacdec/ms_synt.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/ms_synt.cpp | 403 |
1 files changed, 0 insertions, 403 deletions
diff --git a/media/libstagefright/codecs/aacdec/ms_synt.cpp b/media/libstagefright/codecs/aacdec/ms_synt.cpp deleted file mode 100644 index 1f25516..0000000 --- a/media/libstagefright/codecs/aacdec/ms_synt.cpp +++ /dev/null @@ -1,403 +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. - * ------------------------------------------------------------------- - */ -/* - - Pathname: ms_synt.c - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Modified from original shareware code - - Description: Cleaned up a bit, not finished. - - Description: - Copied in code from pns_intensity_right.c, which has the same structure as - this file. Also, merged in code from ms_map_mask.c - - Description: - (1) Various optimizations (eliminated extra variables by making use of a - single temporary register throughout the code, etc.) - (2) Wrote pseudocode, pasted in correct function template, etc. - - Description: Unrolled loops to get speed up code - ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - wins_in_group = Number of windows in the current group. - [const Int] - - coef_per_win = Number of coefficients per window. - [const Int] - - num_bands = Number of scalefactor bands. - [const Int] - - band_length = Number of coefficients per scalefactor band. - [const Int] - - pFirst_Window_CoefsL = Array containing the spectral coefficients for - the left channel. - [Int32 *, length LN] - pFirst_Window_CoefsR = Array containing the spectral coefficients for - the right channel. - [Int32 *, length LN] - q_formatLeft = Array containing the q-format used to encode each - scalefactor band's data on the left channel. - [Int *, length MAXBANDS] - q_formatRight = Array containing the q-format used to encode each - scalefactor band's data on the right channel. - [Int *, length MAXBANDS] - - Local Stores/Buffers/Pointers Needed: - None - - Global Stores/Buffers/Pointers Needed: - None - - Outputs: - None - - Pointers and Buffers Modified: - pFirst_Window_CoefsL The coefficients in the group will be modified per the - formula for M/S stereo on each scalefactor band where - M/S stereo is active. - - pFirst_Window_CoefsR The coefficients in the group will be modified per the - formula for M/S stereo on each scalefactor band where - M/S stereo is active. - - q_formatLeft The q_format may be modified on scalefactor bands - where M/S stereo is active. - - q_formatRight The q_format may be modified on scalefactor bands - where M/S stereo is active. - - Local Stores Modified: - - Global Stores Modified: - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This module applies the formula for M/S coding to one grouped scalefactor - band. The ISO code has a similar function which applies M/S coding to an - entire frame. - - It is the calling function's responsibility to check the map_mask array, which - is filled by the function getmask. If a scalefactor band is identified as - using M/S stereo, the coefficients in that array are calculated using - the following formula... - - TempLeft = LeftCoefficient; - - LeftCoefficient = LeftCoefficient + RightCoefficient; - RightCoefficient = TempLeft - RightCoefficient; - - This function should be inlined if the compiler supports C99 inlining, - as this short function is only called by sfb_tools_ms(). - Therefore, inlining will not increase the code size. - ------------------------------------------------------------------------------- - REQUIREMENTS - - ------------------------------------------------------------------------------- - REFERENCES - - (1) ISO/IEC 14496-3:1999(E) - Part 3 - Subpart 4.6.7.1 M/S stereo - Subpart 4.6.2 ScaleFactors - - (2) 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. - ------------------------------------------------------------------------------- - PSEUDO-CODE - - start_indx = 0; - - pCoefR = coefLeft; - pCoefL = coefRight; - - FOR (win_indx = wins_in_group; win_indx > 0; win_indx--) - - - tempInt = q_formatLeft[start_indx] - q_formatRight[start_indx]; - - IF (tempInt > 0) - THEN - - shift_left_chan = 1 + tempInt; - shift_right_chan = 1; - - q_formatLeft[start_indx] = (q_formatRight[start_indx] - 1); - q_formatRight[start_indx] = (q_formatRight[start_indx] - 1); - - ELSE - shift_left_chan = 1; - shift_right_chan = 1 - tempInt; - - q_formatRight[start_indx] = (q_formatLeft[start_indx] - 1); - q_formatLeft[start_indx] = (q_formatLeft[start_indx] - 1); - - ENDIF - - FOR (tempInt = band_length; tempInt > 0; tempInt--) - - temp_left = *(pCoefL) >> shift_left_chan; - temp_right = *(pCoefR) >> shift_right_chan; - - *(pCoefL++) = temp_left + temp_right; - *(pCoefR++) = temp_left - temp_right; - - ENDFOR - - tempInt = (coef_per_win - band_length); - - pCoefR = pCoefR + tempInt; - pCoefL = pCoefL + tempInt; - - start_indx = start_indx + num_bands; - - ENDFOR - ------------------------------------------------------------------------------- - RESOURCES USED - When the code is written for a specific target processor 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 "ms_synt.h" -#include "fxp_mul32.h" -#include "aac_mem_funcs.h" -#include "window_block_fxp.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 ms_synt( - const Int wins_in_group, - const Int coef_per_win, - const Int num_bands, - const Int band_length, - Int32 coefLeft[], - Int32 coefRight[], - Int q_formatLeft[], - Int q_formatRight[]) -{ - - Int32 *pCoefL = coefLeft; - Int32 *pCoefR = coefRight; - Int start_indx = 0; - - - if (band_length < 0 || band_length > LONG_WINDOW) - { - return; /* avoid any processing on error condition */ - } - - - Int nextWinPtrUpdate = (coef_per_win - band_length); - - for (Int win_indx = wins_in_group; win_indx > 0; win_indx--) - { - - if (q_formatRight[start_indx] < 31) - { - Int tempInt = q_formatLeft[start_indx] - q_formatRight[start_indx]; - - /* Normalize the left and right channel to the same q-format */ - if (tempInt > 0) - { - /* - * shift_left_chan and shift_right_chan each have an offset - * of 1. Even if the left and right channel share the same - * q-format, we must shift each by 1 to guard against - * overflow. - */ - Int shift_left_chan = 1 + tempInt; - - /* - * Following code line is equivalent to... - * q_formatLeft = q_formatRight - 1; - * q_formatRight = q_formatRight - 1; - */ - q_formatLeft[start_indx] = --(q_formatRight[start_indx]); - - - /* - * band_length is always an even number (check tables in pg.66 IS0 14496-3) - */ - - Int32 temp_left = *(pCoefL) >> shift_left_chan; - Int32 temp_right = *(pCoefR) >> 1; - - - - for (Int i = band_length; i != 0; i--) - { - *(pCoefL++) = temp_left + temp_right; - *(pCoefR++) = temp_left - temp_right; - temp_left = *(pCoefL) >> shift_left_chan; - temp_right = *(pCoefR) >> 1; - - } - - } - else - { - /* - * shift_left_chan and shift_right_chan each have an offset - * of 1. Even if the left and right channel share the same - * q-format, we must shift each by 1 to guard against - * overflow. - */ - Int shift_right_chan = 1 - tempInt; - - /* - * Following code line is equivalent to... - * q_formatRight = q_formatLeft - 1; - * q_formatLeft = q_formatLeft - 1; - */ - q_formatRight[start_indx] = --(q_formatLeft[start_indx]); - - /* - * band_length is always an even number (check tables in pg.66 IS0 14496-3) - */ - - Int32 temp_left = *(pCoefL) >> 1; - Int32 temp_right = *(pCoefR) >> shift_right_chan; - - for (Int i = band_length; i != 0; i--) - { - *(pCoefL++) = temp_left + temp_right; - *(pCoefR++) = temp_left - temp_right; - - temp_left = *(pCoefL) >> 1; - temp_right = *(pCoefR) >> shift_right_chan; - - } - } - - } - else - { - /* - * Nothing on right channel, just copy left into right - */ - q_formatRight[start_indx] = (q_formatLeft[start_indx]); - - pv_memcpy(pCoefR, pCoefL, band_length*sizeof(*pCoefR)); - pCoefR += band_length; - pCoefL += band_length; - } - - /* - * Increment the window pointers so they point - * to the next window in the group - */ - pCoefL += nextWinPtrUpdate; - pCoefR += nextWinPtrUpdate; - - start_indx += num_bands; - - } /* for (win_indx) */ - - return; - -} /* MS_synt */ |