diff options
Diffstat (limited to 'media/libstagefright/codecs/aacdec/pulse_nc.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/pulse_nc.cpp | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/media/libstagefright/codecs/aacdec/pulse_nc.cpp b/media/libstagefright/codecs/aacdec/pulse_nc.cpp deleted file mode 100644 index 87b264d..0000000 --- a/media/libstagefright/codecs/aacdec/pulse_nc.cpp +++ /dev/null @@ -1,298 +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: pulse_nc.c - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Modified from original shareware code - - Description: Modified to pass variables by reference to eliminate use - of global variables. - - Description: Modified to bring code in-line with PV standards. - - Description: Pass in max as input argument. - - Description: Went back to the if-statement to check for max. - - Who: Date: - Description: - ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - coef[] = Array of quantized spectral coefficents. - (Int []) - - pPulseInfo = Pointer to structure which contains noiseless - encoding info, includes information about the pulse data, - pulse amplitude, etc. - (const PulseInfo *) - - pLongFrameInfo = Pointer to structure that holds information about - each group. (long block flag, number of windows, - scalefactor bands per group, etc.) - - Variable is named (pLongFrameInfo) because this function - is only used for LONG windows. - (FrameInfo *) - max = Pointer to the maximum value of coef[] - - Local Stores/Buffers/Pointers Needed: - None - - Global Stores/Buffers/Pointers Needed: - None - - Outputs: - None - - Pointers and Buffers Modified: - coef[] = coefficient contents are modified by the encoded pulse - - Local Stores Modified: - - Global Stores Modified: - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This function adds pulses to defined ranges of coefficients in the window, - for the case of LONG windows. The pulses are unsigned, so - negative coefficients subtract the pulse, and positive coefficients add it. - (The ampltiude of the coefficient is always increased by the pulse) - - A maximum of 4 coefficients may be modified by a pulse, and these - coefficients must all occur in the same scalefactor band. - - The number of pulse-encoded coefficients to be processed by this function - is communicated to this function via pPulseInfo->number_pulse - - This value is equal to the actual number of pulses - 1. - (e.g if pPulseInfo->number_pulse == 0, one pulse is assumed) - This function must not be called if no pulse encoded data exists. - The function assumes that at least one pulse exists. ------------------------------------------------------------------------------- - REQUIREMENTS - - This module shall correctly add transmitted pulse(s) to the correct - coefficients in a LONG window. - ------------------------------------------------------------------------------- - REFERENCES - (1) ISO/IEC 14496-3:1999(E) - Part 3 - Subpart 4.6.3.3 Decoding Process - - (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 - - index = pLongFrameInfo->win_sfb_top[0][pPulseInfo->pulse_start_sfb]; - - pPulseOffset = &(pPulseInfo->pulse_offset[0]); - - pPulseAmp = &(pPulseInfo->pulse_amp[0]); - - pCoef = &(Coef[index]); - - FOR (index = pPulseInfo->number_pulse; index >= 0; index--) - - pCoef = pCoef + *(pPulseOffset); - pPulseOffset = pPulseOffset + 1; - - IF (*pCoef > 0) - *(pCoef) = *(pCoef) + *(pPulseAmp); - pPulseAmp = pPulseAmp + 1; - ELSE - *(pCoef) = *(pCoef) - *(pPulseAmp); - pPulseAmp = pPulseAmp + 1; - ENDIF - - ENDFOR - ------------------------------------------------------------------------------- - 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 "s_frameinfo.h" -#include "s_pulseinfo.h" -#include "pulse_nc.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 pulse_nc( - Int16 coef[], - const PulseInfo *pPulseInfo, - const FrameInfo *pLongFrameInfo, - Int *max) -{ - Int index; - - Int16 *pCoef; - Int temp; - - const Int *pPulseOffset; - const Int *pPulseAmp; - - /*--- Find the scalefactor band where pulse-encoded data starts ---*/ - - if (pPulseInfo->pulse_start_sfb > 0) - { - index = pLongFrameInfo->win_sfb_top[0][pPulseInfo->pulse_start_sfb - 1]; - } - else - { - index = 0; - } - - /*------------------------------------------------------------------------- - Each pulse index is stored as an offset from the previous pulse - - Example - here we have a sfb that is 20 coefficients in length: - - [0][1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] - [ ][ ][ ][ ][ ][P][P][ ][ ][ ][ ][ ][ ][ ][ ][ P][ ][ ][ ][ P] - - The array pointed to by pPulseOffset == [5][1][9][4] - - pPulseAmp is of the same length as pPulseOffset, and contains - an individual pulse amplitude for each coefficient. - --------------------------------------------------------------------------*/ - - pCoef = &(coef[index]); - - pPulseOffset = &(pPulseInfo->pulse_offset[0]); - - pPulseAmp = &(pPulseInfo->pulse_amp[0]); - - for (index = pPulseInfo->number_pulse; index > 0; index--) - { - pCoef += *pPulseOffset++; - - temp = *pCoef; - - if (temp > 0) - { - temp += *(pPulseAmp++); - *pCoef = (Int16)temp; - if (temp > *max) - { - *max = temp; - } - } - else - { - temp -= *(pPulseAmp++); - *pCoef = (Int16)temp; - if (-temp > *max) - { - *max = -temp; - } - } - - } /* for() */ - - return; - -} /* pulse_nc */ |