12228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 22228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* ----------------------------------------------------------------------------------------------------------- 32228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectSoftware License for The Fraunhofer FDK AAC Codec Library for Android 42228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 54f0d97057c5c640b25518358886f8c47da9fc052Jean-Michel Trivi� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 62228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project All rights reserved. 72228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 82228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1. INTRODUCTION 92228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThe Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthe MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 112228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThis FDK AAC Codec software is intended to be used on a wide variety of Android devices. 122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 132228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectaudio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectindependent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectof the MPEG specifications. 172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 182228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectPatent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectmay be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectindividually for the purpose of encoding or decoding bit streams in products that are compliant with 212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthe ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthese patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectsoftware may already be covered under those patent licenses when it is used for those licensed purposes only. 242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 252228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectCommercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectare also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectapplications information and documentation. 282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project2. COPYRIGHT LICENSE 302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 312228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectRedistribution and use in source and binary forms, with or without modification, are permitted without 322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectpayment of copyright license fees provided that you satisfy the following conditions: 332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 342228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must retain the complete text of this software license in redistributions of the FDK AAC Codec or 352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectyour modifications thereto in source code form. 362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 372228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must retain the complete text of this software license in the documentation and/or other materials 382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectprovided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 392228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must make available free of charge copies of the complete source code of the FDK AAC Codec and your 402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectmodifications thereto to recipients of copies in binary form. 412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 422228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThe name of Fraunhofer may not be used to endorse or promote products derived from this library without 432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectprior written permission. 442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 452228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectsoftware or your modifications thereto. 472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 482228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYour modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectand the date of any change. For modified versions of the FDK AAC Codec, the term 502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project3. NO PATENT LICENSE 542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 552228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectNO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 562228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectrespect to this software. 582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 592228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectby appropriate patent licenses. 612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project4. DISCLAIMER 632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 642228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThis FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectof merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 672228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectCONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectincluding but not limited to procurement of substitute goods or services; loss of use, data, or profits, 692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projector business interruption, however caused and on any theory of liability, whether in contract, strict 702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectliability, or tort (including negligence), arising in any way out of the use of this software, even if 712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectadvised of the possibility of such damage. 722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project5. CONTACT INFORMATION 742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 752228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectFraunhofer Institute for Integrated Circuits IIS 762228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAttention: Audio and Multimedia Departments - FDK AAC LL 772228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAm Wolfsmantel 33 782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project91058 Erlangen, Germany 792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectwww.iis.fraunhofer.de/amm 812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectamm-info@iis.fraunhofer.de 822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project----------------------------------------------------------------------------------------------------------- */ 832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "psdec_hybrid.h" 852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "fft.h" 882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "sbr_ram.h" 892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "FDK_tools_rom.h" 912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "sbr_rom.h" 922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: InitHybridFilterBank 952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: Init one instance of HANDLE_HYBRID stuct 982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Arguments: 1002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 1022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 1042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1062228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectSBR_ERROR 1072228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectInitHybridFilterBank ( HANDLE_HYBRID hs, /*!< Handle to HYBRID struct. */ 1082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project SCHAR frameSize, /*!< Framesize (in Qmf s�bband samples). */ 1092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project SCHAR noBands, /*!< Number of Qmf bands for hybrid filtering. */ 1102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const UCHAR *pResolution ) /*!< Resolution in Qmf bands (length noBands). */ 1112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project SCHAR i; 1132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project UCHAR maxNoChannels = 0; 1142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i = 0; i < noBands; i++) { 1162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hs->pResolution[i] = pResolution[i]; 1172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if(pResolution[i] > maxNoChannels) 1182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project maxNoChannels = pResolution[i]; 1192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hs->nQmfBands = noBands; 1222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hs->frameSize = frameSize; 1232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hs->qmfBufferMove = HYBRID_FILTER_LENGTH - 1; 1242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hs->sf_mQmfBuffer = 0; 1262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return SBRDEC_OK; 1282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 1312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: dualChannelFiltering 1322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 1332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: fast 2-channel real-valued filtering with 6-tap delay. 1352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Arguments: 1372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 1392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 1412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 1432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project2 channel filter 1442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project<pre> 1452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Filter Coefs: 1462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0, 1472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.01899487526049, 1482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0, 1492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project -0.07293139167538, 1502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0, 1512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.30596630545168, 1522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.5, 1532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.30596630545168, 1542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0, 1552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project -0.07293139167538, 1562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0, 1572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.01899487526049, 1582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.0 1592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Filter design: 1622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project h[q,n] = g[n] * cos(2pi/2 * q * (n-6) ); n = 0..12, q = 0,1; 1632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project -> h[0,n] = g[n] * 1; 1652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project -> h[1,n] = g[n] * pow(-1,n); 1662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project</pre> 1672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 1682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic void slotBasedDualChannelFiltering( const FIXP_DBL *pQmfReal, 1702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_DBL *pQmfImag, 1712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *mHybridReal, 1732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *mHybridImag) 1742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL t1, t3, t5, t6; 1772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* symmetric filter coefficients */ 1792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* you don't have to shift the result after fMult because of p2_13_20 <= 0.5 */ 1812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t1 = fMultDiv2(p2_13_20[1] , ( (pQmfReal[1] >> 1) + (pQmfReal[11] >> 1))); 1822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t3 = fMultDiv2(p2_13_20[3] , ( (pQmfReal[3] >> 1) + (pQmfReal[ 9] >> 1))); 1832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t5 = fMultDiv2(p2_13_20[5] , ( (pQmfReal[5] >> 1) + (pQmfReal[ 7] >> 1))); 1842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t6 = fMultDiv2(p2_13_20[6] , (pQmfReal[6] >> 1) ); 1852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridReal[0] = (t1 + t3 + t5 + t6) << 2; 1872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridReal[1] = (- t1 - t3 - t5 + t6) << 2; 1882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t1 = fMultDiv2(p2_13_20[1] , ( (pQmfImag[1] >> 1) + (pQmfImag[11] >> 1))); 1902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t3 = fMultDiv2(p2_13_20[3] , ( (pQmfImag[3] >> 1) + (pQmfImag[ 9] >> 1))); 1912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t5 = fMultDiv2(p2_13_20[5] , ( (pQmfImag[5] >> 1) + (pQmfImag[ 7] >> 1))); 1922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project t6 = fMultDiv2(p2_13_20[6] , pQmfImag[6] >> 1 ); 1932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridImag[0] = (t1 + t3 + t5 + t6) << 2; 1952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridImag[1] = (- t1 - t3 - t5 + t6) << 2; 1962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 2002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: eightChannelFiltering 2012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 2022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: fast 8-channel complex-valued filtering with 6-tap delay. 2042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Arguments: 2062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 2082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 2102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 2112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 8 channel filter 2122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Implementation using a FFT of length 8 2142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project<pre> 2152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project prototype filter coefficients: 2162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.00746082949812 0.02270420949825 0.04546865930473 0.07266113929591 0.09885108575264 0.11793710567217 2172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.125 2182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0.11793710567217 0.09885108575264 0.07266113929591 0.04546865930473 0.02270420949825 0.00746082949812 2192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Filter design: 2212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project N = 13; Q = 8; 2222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project h[q,n] = g[n] * exp(j * 2 * pi / Q * (q + .5) * (n - 6)); n = 0..(N-1), q = 0..(Q-1); 2232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Time Signal: x[t]; 2252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Filter Bank Output 2262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y[q,t] = conv(x[t],h[q,t]) = conv(h[q,t],x[t]) = sum(x[k] * h[q, t - k] ) = sum(h[q, k] * x[t - k] ); k = 0..(N-1); 2272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y[q,t] = x[t - 12]*h[q, 12] + x[t - 11]*h[q, 11] + x[t - 10]*h[q, 10] + x[t - 9]*h[q, 9] 2292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 8]*h[q, 8] + x[t - 7]*h[q, 7] 2302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 6]*h[q, 6] 2312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 5]*h[q, 5] + x[t - 4]*h[q, 4] 2322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 3]*h[q, 3] + x[t - 2]*h[q, 2] + x[t - 1]*h[q, 1] + x[t - 0]*h[q, 0]; 2332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project h'[q, n] = h[q,(N-1)-n] = g[n] * exp(j * 2 * pi / Q * (q + .5) * (6 - n)); n = 0..(N-1), q = 0..(Q-1); 2352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y[q,t] = x[t - 12]*h'[q, 0] + x[t - 11]*h'[q, 1] + x[t - 10]*h'[q, 2] + x[t - 9]*h'[q, 3] 2372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 8]*h'[q, 4] + x[t - 7]*h'[q, 5] 2382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 6]*h'[q, 6] 2392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 5]*h'[q, 7] + x[t - 4]*h'[q, 8] 2402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + x[t - 3]*h'[q, 9] + x[t - 2]*h'[q, 10] + x[t - 1]*h'[q, 11] + x[t - 0]*h'[q, 12]; 2412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Try to split off FFT Modulation Term: 2432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FFT(x[t], q) = sum(x[t+k]*exp(-j*2*pi/N *q * k)) 2442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project c m 2452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Step 1: h'[q,n] = g[n] * ( exp(j * 2 * pi / 8 * .5 * (6 - n)) ) * ( exp (j * 2 * pi / 8 * q * (6 - n)) ); 2462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project h'[q,n] = g[n] *c[n] * m[q,n]; (see above) 2482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project c[n] = exp( j * 2 * pi / 8 * .5 * (6 - n) ); 2492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[q,n] = exp( j * 2 * pi / 8 * q * (6 - n) ); 2502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y[q,t] = x[t - 0]*g[0]*c[0]*m[q,0] + x[t - 1]*g[1]*c[ 1]*m[q, 1] + ... 2522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ... + x[t - 12]*g[2]*c[12]*m[q,12]; 2532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project | 2552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project n m *exp(-j*2*pi) | n' fft 2562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project------------------------------------------------------------------------------------------------------------------------- 2572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0 exp( j * 2 * pi / 8 * q * 6) -> exp(-j * 2 * pi / 8 * q * 2) | 2 exp(-j * 2 * pi / 8 * q * 0) 2582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1 exp( j * 2 * pi / 8 * q * 5) -> exp(-j * 2 * pi / 8 * q * 3) | 3 exp(-j * 2 * pi / 8 * q * 1) 2592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2 exp( j * 2 * pi / 8 * q * 4) -> exp(-j * 2 * pi / 8 * q * 4) | 4 exp(-j * 2 * pi / 8 * q * 2) 2602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3 exp( j * 2 * pi / 8 * q * 3) -> exp(-j * 2 * pi / 8 * q * 5) | 5 exp(-j * 2 * pi / 8 * q * 3) 2612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4 exp( j * 2 * pi / 8 * q * 2) -> exp(-j * 2 * pi / 8 * q * 6) | 6 exp(-j * 2 * pi / 8 * q * 4) 2622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5 exp( j * 2 * pi / 8 * q * 1) -> exp(-j * 2 * pi / 8 * q * 7) | 7 exp(-j * 2 * pi / 8 * q * 5) 2632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6 exp( j * 2 * pi / 8 * q * 0) | 0 exp(-j * 2 * pi / 8 * q * 6) 2642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 7 exp(-j * 2 * pi / 8 * q * 1) | 1 exp(-j * 2 * pi / 8 * q * 7) 2652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 8 exp(-j * 2 * pi / 8 * q * 2) | 2 2662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 9 exp(-j * 2 * pi / 8 * q * 3) | 3 2672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 10 exp(-j * 2 * pi / 8 * q * 4) | 4 2682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 11 exp(-j * 2 * pi / 8 * q * 5) | 5 2692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 12 exp(-j * 2 * pi / 8 * q * 6) | 6 2702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project now use fft modulation coefficients 2732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[6] = = fft[0] 2742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[7] = = fft[1] 2752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[8] = m[ 0] = fft[2] 2762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[9] = m[ 1] = fft[3] 2772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[10] = m[ 2] = fft[4] 2782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[11] = m[ 3] = fft[5] 2792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[12] = m[ 4] = fft[6] 2802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project m[ 5] = fft[7] 2812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y[q,t] = ( x[t- 6]*g[ 6]*c[ 6] ) * fft[q,0] + 2832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 7]*g[ 7]*c[ 7] ) * fft[q,1] + 2842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 0]*g[ 0]*c[ 0] + x[t- 8]*g[ 8]*c[ 8] ) * fft[q,2] + 2852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 1]*g[ 1]*c[ 1] + x[t- 9]*g[ 9]*c[ 9] ) * fft[q,3] + 2862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 2]*g[ 2]*c[ 2] + x[t-10]*g[10]*c[10] ) * fft[q,4] + 2872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 3]*g[ 3]*c[ 3] + x[t-11]*g[11]*c[11] ) * fft[q,5] + 2882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 4]*g[ 4]*c[ 4] + x[t-12]*g[12]*c[12] ) * fft[q,6] + 2892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ( x[t- 5]*g[ 5]*c[ 5] ) * fft[q,7]; 2902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pre twiddle factors c[n] = exp(j * 2 * pi / 8 * .5 * (6 - n)); 2922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project n c] | n c[n] | n c[n] 2932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project--------------------------------------------------------------------------------------------------- 2942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 0 exp( j * 6 * pi / 8) | 1 exp( j * 5 * pi / 8) | 2 exp( j * 4 * pi / 8) 2952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3 exp( j * 3 * pi / 8) | 4 exp( j * 2 * pi / 8) | 5 exp( j * 1 * pi / 8) 2962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6 exp( j * 0 * pi / 8) | 7 exp(-j * 1 * pi / 8) | 8 exp(-j * 2 * pi / 8) 2972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 9 exp(-j * 3 * pi / 8) | 10 exp(-j * 4 * pi / 8) | 11 exp(-j * 5 * pi / 8) 2982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 12 exp(-j * 6 * pi / 8) | | 2992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project</pre> 3002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 3012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* defining rotation factors for *ChannelFiltering */ 3032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos0Pi FL2FXCONST_DBL( 1.f) 3052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin0Pi FL2FXCONST_DBL( 0.f) 3062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos1Pi FL2FXCONST_DBL(-1.f) 3082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin1Pi FL2FXCONST_DBL( 0.f) 3092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos1Pi_2 FL2FXCONST_DBL( 0.f) 3112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin1Pi_2 FL2FXCONST_DBL( 1.f) 3122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos1Pi_3 FL2FXCONST_DBL( 0.5f) 3142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin1Pi_3 FL2FXCONST_DBL( 0.86602540378444f) 3152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos0Pi_4 cos0Pi 3172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos1Pi_4 FL2FXCONST_DBL(0.70710678118655f) 3182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos2Pi_4 cos1Pi_2 3192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos3Pi_4 (-cos1Pi_4) 3202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos4Pi_4 (-cos0Pi_4) 3212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos5Pi_4 cos3Pi_4 3222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos6Pi_4 cos2Pi_4 3232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin0Pi_4 sin0Pi 3252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin1Pi_4 FL2FXCONST_DBL(0.70710678118655f) 3262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin2Pi_4 sin1Pi_2 3272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin3Pi_4 sin1Pi_4 3282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin4Pi_4 sin0Pi_4 3292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin5Pi_4 (-sin3Pi_4) 3302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin6Pi_4 (-sin2Pi_4) 3312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos0Pi_8 cos0Pi 3332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos1Pi_8 FL2FXCONST_DBL(0.92387953251129f) 3342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos2Pi_8 cos1Pi_4 3352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos3Pi_8 FL2FXCONST_DBL(0.38268343236509f) 3362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos4Pi_8 cos2Pi_4 3372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos5Pi_8 (-cos3Pi_8) 3382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define cos6Pi_8 (-cos2Pi_8) 3392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin0Pi_8 sin0Pi 3412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin1Pi_8 cos3Pi_8 3422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin2Pi_8 sin1Pi_4 3432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin3Pi_8 cos1Pi_8 3442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin4Pi_8 sin2Pi_4 3452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin5Pi_8 sin3Pi_8 3462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define sin6Pi_8 sin1Pi_4 3472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#if defined(ARCH_PREFER_MULT_32x16) 3492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define FIXP_HYB FIXP_SGL 3502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define FIXP_CAST FX_DBL2FX_SGL 3512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 3522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define FIXP_HYB FIXP_DBL 3532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define FIXP_CAST 3542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 3552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_HYB cr[13] = 3572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 3582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(cos6Pi_8), FIXP_CAST(cos5Pi_8), FIXP_CAST(cos4Pi_8), 3592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(cos3Pi_8), FIXP_CAST(cos2Pi_8), FIXP_CAST(cos1Pi_8), 3602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(cos0Pi_8), 3612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(cos1Pi_8), FIXP_CAST(cos2Pi_8), FIXP_CAST(cos3Pi_8), 3622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(cos4Pi_8), FIXP_CAST(cos5Pi_8), FIXP_CAST(cos6Pi_8) 3632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 3642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_HYB ci[13] = 3662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 3672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST( sin6Pi_8), FIXP_CAST( sin5Pi_8), FIXP_CAST( sin4Pi_8), 3682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST( sin3Pi_8), FIXP_CAST( sin2Pi_8), FIXP_CAST( sin1Pi_8), 3692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST( sin0Pi_8) , 3702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(-sin1Pi_8), FIXP_CAST(-sin2Pi_8), FIXP_CAST(-sin3Pi_8), 3712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_CAST(-sin4Pi_8), FIXP_CAST(-sin5Pi_8), FIXP_CAST(-sin6Pi_8) 3722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 3732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic void slotBasedEightChannelFiltering( const FIXP_DBL *pQmfReal, 3752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_DBL *pQmfImag, 3762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *mHybridReal, 3782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *mHybridImag) 3792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 3802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int bin; 3822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL _fft[128 + ALIGNMENT_DEFAULT - 1]; 3832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *fft = (FIXP_DBL *)ALIGN_PTR(_fft); 3842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#if defined(ARCH_PREFER_MULT_32x16) 3862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_SGL *p = p8_13_20; /* BASELINE_PS */ 3872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 3882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_DBL *p = p8_13_20; /* BASELINE_PS */ 3892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 3902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* pre twiddeling */ 3922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* x*(a*b + c*d) = fMultDiv2(x, fMultAddDiv2(fMultDiv2(a, b), c, d)) */ 3942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* x*(a*b - c*d) = fMultDiv2(x, fMultSubDiv2(fMultDiv2(a, b), c, d)) */ 3952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL accu1, accu2, accu3, accu4; 3962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define TWIDDLE_1(n_0,n_1,n_2) \ 3982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project cplxMultDiv2(&accu1, &accu2, pQmfReal[n_0], pQmfImag[n_0], cr[n_0], ci[n_0]); \ 3992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project accu1 = fMultDiv2(p[n_0], accu1); \ 4002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project accu2 = fMultDiv2(p[n_0], accu2); \ 4012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project cplxMultDiv2(&accu3, &accu4, pQmfReal[n_1], pQmfImag[n_1], cr[n_1], ci[n_1]); \ 4022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project accu3 = fMultDiv2(p[n_1], accu3); \ 4032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project accu4 = fMultDiv2(p[n_1], accu4); \ 4042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fft[FIXP_FFT_IDX_R(n_2)] = accu1 + accu3; \ 4052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fft[FIXP_FFT_IDX_I(n_2)] = accu2 + accu4; 4062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project #define TWIDDLE_0(n_0,n_1) \ 4082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project cplxMultDiv2(&accu1, &accu2, pQmfReal[n_0], pQmfImag[n_0], cr[n_0], ci[n_0]); \ 4092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fft[FIXP_FFT_IDX_R(n_1)] = fMultDiv2(p[n_0], accu1); \ 4102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fft[FIXP_FFT_IDX_I(n_1)] = fMultDiv2(p[n_0], accu2); 4112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_0( 6, 0) 4132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_0( 7, 1) 4142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_1( 0, 8, 2) 4162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_1( 1, 9, 3) 4172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_1( 2,10, 4) 4182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_1( 3,11, 5) 4192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_1( 4,12, 6) 4202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project TWIDDLE_0( 5, 7) 4222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fft_8 (fft); 4242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* resort fft data into output array*/ 4262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(bin=0; bin<8;bin++ ) { 4272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridReal[bin] = fft[FIXP_FFT_IDX_R(bin)] << 4; 4282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project mHybridImag[bin] = fft[FIXP_FFT_IDX_I(bin)] << 4; 4292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 4312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 4342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: fillHybridDelayLine 4352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 4362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: The delay line of the hybrid filter is filled and copied from 4382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project left to right. 4392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 4412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 4432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid 4452228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectfillHybridDelayLine( FIXP_DBL **fixpQmfReal, /*!< Qmf real Values */ 4462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL **fixpQmfImag, /*!< Qmf imag Values */ 4472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridLeftR[12], /*!< Hybrid real Values left channel */ 4482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridLeftI[12], /*!< Hybrid imag Values left channel */ 4492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridRightR[12], /*!< Hybrid real Values right channel */ 4502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridRightI[12], /*!< Hybrid imag Values right channel */ 4512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project HANDLE_HYBRID hHybrid ) 4522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 4532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int i; 4542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i = 0; i < HYBRID_FILTER_DELAY; i++) { 4562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project slotBasedHybridAnalysis ( fixpQmfReal[i], 4572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpQmfReal[i], 4582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridLeftR, 4592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridLeftI, 4602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hHybrid ); 4612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(fixpHybridRightR, fixpHybridLeftR, sizeof(FIXP_DBL)*NO_SUB_QMF_CHANNELS); 4642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(fixpHybridRightI, fixpHybridLeftI, sizeof(FIXP_DBL)*NO_SUB_QMF_CHANNELS); 4652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 4662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 4692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: slotBasedHybridAnalysis 4702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 4712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: The lower QMF subbands are further split to provide better 4732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project frequency resolution for PS processing. 4742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 4762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 4782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid 4812228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectslotBasedHybridAnalysis ( FIXP_DBL *fixpQmfReal, /*!< Qmf real Values */ 4822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *fixpQmfImag, /*!< Qmf imag Values */ 4832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridReal[12], /*!< Hybrid real Values */ 4852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL fixpHybridImag[12], /*!< Hybrid imag Values */ 4862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project HANDLE_HYBRID hHybrid) 4882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 4892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int k, band; 4902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project HYBRID_RES hybridRes; 4912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int chOffset = 0; 4922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project C_ALLOC_SCRATCH_START(pTempRealSlot, FIXP_DBL, 4*HYBRID_FILTER_LENGTH); 4942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pTempImagSlot = pTempRealSlot + HYBRID_FILTER_LENGTH; 4962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pWorkRealSlot = pTempImagSlot + HYBRID_FILTER_LENGTH; 4972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pWorkImagSlot = pWorkRealSlot + HYBRID_FILTER_LENGTH; 4982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /*! 5002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Hybrid filtering is applied to the first hHybrid->nQmfBands QMF bands (3 when 10 or 20 stereo bands 5012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project are used, 5 when 34 stereo bands are used). For the remaining QMF bands a delay would be necessary. 5022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project But there is no need to implement a delay because there is a look-ahead of HYBRID_FILTER_DELAY = 6 5032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project QMF samples in the low-band buffer. 5042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 5052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(band = 0; band < hHybrid->nQmfBands; band++) { 5072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* get hybrid resolution per qmf band */ 5092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* in case of baseline ps 10/20 band stereo mode : */ 5102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* */ 5112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* qmfBand[0] : 8 ( HYBRID_8_CPLX ) */ 5122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* qmfBand[1] : 2 ( HYBRID_2_REAL ) */ 5132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* qmfBand[2] : 2 ( HYBRID_2_REAL ) */ 5142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* */ 5152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* (split the 3 lower qmf band to 12 hybrid bands) */ 5162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hybridRes = (HYBRID_RES)hHybrid->pResolution[band]; 5182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(pWorkRealSlot, hHybrid->mQmfBufferRealSlot[band], hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); 5202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(pWorkImagSlot, hHybrid->mQmfBufferImagSlot[band], hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); 5212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pWorkRealSlot[hHybrid->qmfBufferMove] = fixpQmfReal[band]; 5232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pWorkImagSlot[hHybrid->qmfBufferMove] = fixpQmfImag[band]; 5242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(hHybrid->mQmfBufferRealSlot[band], pWorkRealSlot + 1, hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); 5262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(hHybrid->mQmfBufferImagSlot[band], pWorkImagSlot + 1, hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); 5272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (fixpQmfReal) { 5292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* actual filtering only if output signal requested */ 5312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project switch( hybridRes ) { 5322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* HYBRID_2_REAL & HYBRID_8_CPLX are only needful for baseline ps */ 5342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project case HYBRID_2_REAL: 5352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project slotBasedDualChannelFiltering( pWorkRealSlot, 5372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pWorkImagSlot, 5382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTempRealSlot, 5392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTempImagSlot); 5402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 5412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project case HYBRID_8_CPLX: 5432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project slotBasedEightChannelFiltering( pWorkRealSlot, 5452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pWorkImagSlot, 5462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTempRealSlot, 5472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTempImagSlot); 5482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 5492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project default: 5512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(0); 5522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 5532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(k = 0; k < (SCHAR)hybridRes; k++) { 5552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridReal [chOffset + k] = pTempRealSlot[k]; 5562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridImag [chOffset + k] = pTempImagSlot[k]; 5572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 5582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project chOffset += hybridRes; 5592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } /* if (mHybridReal) */ 5602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 5612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* group hybrid channels 3+4 -> 3 and 2+5 -> 2 */ 5632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridReal[3] += fixpHybridReal[4]; 5642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridImag[3] += fixpHybridImag[4]; 5652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridReal[4] = (FIXP_DBL)0; 5662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridImag[4] = (FIXP_DBL)0; 5672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridReal[2] += fixpHybridReal[5]; 5692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridImag[2] += fixpHybridImag[5]; 5702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridReal[5] = (FIXP_DBL)0; 5712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpHybridImag[5] = (FIXP_DBL)0; 5722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* free memory on scratch */ 5742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project C_ALLOC_SCRATCH_END(pTempRealSlot, FIXP_DBL, 4*HYBRID_FILTER_LENGTH); 5752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 5772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/******************************************************************************* 5802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Functionname: slotBasedHybridSynthesis 5812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ******************************************************************************* 5822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: The coefficients offering higher resolution for the lower QMF 5842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project channel are simply added prior to the synthesis with the 54 5852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project subbands QMF. 5862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Arguments: 5882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Return: none 5902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*******************************************************************************/ 5922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! <pre> 5942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r0(n) ---\ 5952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r1(n) ---- + --\ 5962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r2(n) ---/ \ 5972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + --> F0(w) 5982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r3(n) ---\ / 5992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r4(n) ---- + --/ 6002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r5(n) ---/ 6012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r6(n) ---\ 6042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + ---------> F1(w) 6052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r7(n) ---/ 6062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r8(n) ---\ 6092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project + ---------> F2(w) 6102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project l,r9(n) ---/ 6112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project </pre> 6132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Hybrid QMF synthesis filterbank for the 10 and 20 stereo-bands configurations. The 6142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project coefficients offering higher resolution for the lower QMF channel are simply added 6152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project prior to the synthesis with the 54 subbands QMF. 6162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [see ISO/IEC 14496-3:2001/FDAM 2:2004(E) - Page 52] 6182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 6192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid 6222228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectslotBasedHybridSynthesis ( FIXP_DBL *fixpHybridReal, /*!< Hybrid real Values */ 6232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *fixpHybridImag, /*!< Hybrid imag Values */ 6242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *fixpQmfReal, /*!< Qmf real Values */ 6252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *fixpQmfImag, /*!< Qmf imag Values */ 6262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project HANDLE_HYBRID hHybrid ) /*!< Handle to HYBRID struct. */ 6272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 6282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int k, band; 6292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project HYBRID_RES hybridRes; 6312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int chOffset = 0; 6322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(band = 0; band < hHybrid->nQmfBands; band++) { 6342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL qmfReal = FL2FXCONST_DBL(0.f); 6362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL qmfImag = FL2FXCONST_DBL(0.f); 6372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hybridRes = (HYBRID_RES)hHybrid->pResolution[band]; 6382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(k = 0; k < (SCHAR)hybridRes; k++) { 6402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project qmfReal += fixpHybridReal[chOffset + k]; 6412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project qmfImag += fixpHybridImag[chOffset + k]; 6422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 6432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpQmfReal[band] = qmfReal; 6452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fixpQmfImag[band] = qmfImag; 6462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project chOffset += hybridRes; 6482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 6492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 6502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 653