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/*************************** Fraunhofer IIS FDK Tools ********************** 852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Author(s): Josef Hoepfl, Manuel Jander 872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Description: MDCT routines 882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project******************************************************************************/ 902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "mdct.h" 922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "FDK_tools_rom.h" 952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "dct.h" 962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "fixpoint_math.h" 972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid mdct_init( H_MDCT hMdct, 1002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *overlap, 1012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT overlapBufferSize ) 1022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->overlap.freq = overlap; 1042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project //FDKmemclear(overlap, overlapBufferSize*sizeof(FIXP_DBL)); 1052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_fr = 0; 1062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_nr = 0; 1072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_tl = 0; 1082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_size = overlapBufferSize; 1092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid imdct_gain(FIXP_DBL *pGain_m, int *pGain_e, int tl) 1132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL gain_m = *pGain_m; 1152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int gain_e = *pGain_e; 1162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int log2_tl; 1172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project log2_tl = DFRACT_BITS-1-fNormz((FIXP_DBL)tl); 1192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project gain_e += -MDCT_OUTPUT_GAIN - log2_tl - MDCT_OUT_HEADROOM + 1; 1212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Detect non-radix 2 transform length and add amplitude compensation factor 1232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project which cannot be included into the exponent above */ 1242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project switch ( (tl) >> (log2_tl - 2) ) { 1252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project case 0x7: /* 10 ms, 1/tl = 1.0/(FDKpow(2.0, -log2_tl) * 0.53333333333333333333) */ 1262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (gain_m == (FIXP_DBL)0) { 1272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project gain_m = FL2FXCONST_DBL(0.53333333333333333333f); 1282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 1292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project gain_m = fMult(gain_m, FL2FXCONST_DBL(0.53333333333333333333f)); 1302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 1322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project case 0x6: /* 3/4 of radix 2, 1/tl = 1.0/(FDKpow(2.0, -log2_tl) * 2.0/3.0) */ 1332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (gain_m == (FIXP_DBL)0) { 1342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project gain_m = FL2FXCONST_DBL(2.0/3.0f); 1352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 1362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project gain_m = fMult(gain_m, FL2FXCONST_DBL(2.0/3.0f)); 1372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 1392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project case 0x4: 1402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* radix 2, nothing to do. */ 1412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 1422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project default: 1432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* unsupported */ 1442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(0); 1452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 1462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pGain_m = gain_m; 1492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pGain_e = gain_e; 1502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1522228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectINT imdct_drain( 1532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project H_MDCT hMdct, 1542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *output, 1552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT nrSamplesRoom 1562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ) 1572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int buffered_samples = 0; 1592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (nrSamplesRoom > 0) { 1612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project buffered_samples = hMdct->ov_offset; 1622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(buffered_samples <= nrSamplesRoom); 1642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (buffered_samples > 0) { 1662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(output, hMdct->overlap.time, buffered_samples*sizeof(FIXP_DBL)); 1672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_offset = 0; 1682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return buffered_samples; 1712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1732228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectINT imdct_copy_ov_and_nr( 1742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project H_MDCT hMdct, 1752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL * pTimeData, 1762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT nrSamples 1772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ) 1782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 1792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pOvl; 1802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int nt, nf, i; 1812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nt = fMin(hMdct->ov_offset, nrSamples); 1832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nrSamples -= nt; 1842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nf = fMin(hMdct->prev_nr, nrSamples); 1852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nrSamples -= nf; 1862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemcpy(pTimeData, hMdct->overlap.time, nt*sizeof(FIXP_DBL)); 1872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTimeData += nt; 1882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOvl = hMdct->overlap.freq + hMdct->ov_size - 1; 1902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<nf; i++) { 1912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL x = - (*pOvl--); 1922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pTimeData = IMDCT_SCALE_DBL(x); 1932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pTimeData ++; 1942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 1952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return (nt+nf); 1972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 1982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectvoid imdct_adapt_parameters(H_MDCT hMdct, int *pfl, int *pnl, int tl, const FIXP_WTP *wls, int noOutSamples) 2002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 2012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int fl = *pfl, nl = *pnl; 2022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int window_diff, use_current = 0, use_previous = 0; 2032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (hMdct->prev_tl == 0) { 2042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_wrs = wls; 2052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_fr = fl; 2062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_nr = (noOutSamples-fl)>>1; 2072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_tl = noOutSamples; 2082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_offset = 0; 2092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project use_current = 1; 2102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project window_diff = (hMdct->prev_fr - fl)>>1; 2132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* check if the previous window slope can be adjusted to match the current window slope */ 2152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (hMdct->prev_nr + window_diff > 0) { 2162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project use_current = 1; 2172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* check if the current window slope can be adjusted to match the previous window slope */ 2192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (nl - window_diff > 0 ) { 2202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project use_previous = 1; 2212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* if both is possible choose the larger of both window slope lengths */ 2242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (use_current && use_previous) { 2252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (fl < hMdct->prev_fr) { 2262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project use_current = 0; 2272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 2282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project use_previous = 0; 2292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* 2322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project * If the previous transform block is big enough, enlarge previous window overlap, 2332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project * if not, then shrink current window overlap. 2342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 2352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (use_current) { 2362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_nr += window_diff; 2372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_fr = fl; 2382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_wrs = wls; 2392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 2402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nl -= window_diff; 2412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project fl = hMdct->prev_fr; 2422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pfl = fl; 2452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pnl = nl; 2462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 2472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2482228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectINT imdct_block( 2492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project H_MDCT hMdct, 2502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *output, 2512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *spectrum, 2522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const SHORT scalefactor[], 2532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const INT nSpec, 2542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const INT noOutSamples, 2552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const INT tl, 2562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_WTP *wls, 2572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT fl, 2582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_WTP *wrs, 2592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const INT fr, 2602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL gain 2612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ) 2622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 2632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pOvl; 2642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pOut0 = output, *pOut1; 2652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT nl, nr; 2662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int w, i, nrSamples = 0, specShiftScale, transform_gain_e = 0; 2672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Derive NR and NL */ 2692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nr = (tl - fr)>>1; 2702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nl = (tl - fl)>>1; 2712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Include 2/N IMDCT gain into gain factor and exponent. */ 2732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project imdct_gain(&gain, &transform_gain_e, tl); 2742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Detect FRprevious / FL mismatches and override parameters accordingly */ 2762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (hMdct->prev_fr != fl) { 2772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project imdct_adapt_parameters(hMdct, &fl, &nl, tl, wls, noOutSamples); 2782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOvl = hMdct->overlap.freq + hMdct->ov_size - 1; 2812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if ( noOutSamples > nrSamples ) { 2832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Purge buffered output. */ 2842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<hMdct->ov_offset; i++) { 2852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pOut0 = hMdct->overlap.time[i]; 2862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut0 ++; 2872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nrSamples = hMdct->ov_offset; 2892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_offset = 0; 2902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 2912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (w=0; w<nSpec; w++) 2932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project { 2942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL *pSpec, *pCurr; 2952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_WTP *pWindow; 2962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project specShiftScale = transform_gain_e; 2982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Setup window pointers */ 3002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pWindow = hMdct->prev_wrs; 3012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Current spectrum */ 3032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pSpec = spectrum+w*tl; 3042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* DCT IV of current spectrum. */ 3062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project dct_IV(pSpec, tl, &specShiftScale); 3072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Optional scaling of time domain - no yet windowed - of current spectrum */ 3092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* and de-scale current spectrum signal (time domain, no yet windowed) */ 3102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (gain != (FIXP_DBL)0) { 3112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project scaleValuesWithFactor(pSpec, gain, tl, scalefactor[w] + specShiftScale); 3122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 3132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project scaleValues(pSpec, tl, scalefactor[w] + specShiftScale); 3142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if ( noOutSamples <= nrSamples ) { 3172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Divert output first half to overlap buffer if we already got enough output samples. */ 3182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut0 = hMdct->overlap.time + hMdct->ov_offset; 3192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_offset += hMdct->prev_nr + fl/2; 3202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 3212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Account output samples */ 3222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nrSamples += hMdct->prev_nr + fl/2; 3232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* NR output samples 0 .. NR. -overlap[TL/2..TL/2-NR] */ 3262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<hMdct->prev_nr; i++) { 3272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL x = - (*pOvl--); 3282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pOut0 = IMDCT_SCALE_DBL(x); 3292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut0 ++; 3302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if ( noOutSamples <= nrSamples ) { 3332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Divert output second half to overlap buffer if we already got enough output samples. */ 3342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut1 = hMdct->overlap.time + hMdct->ov_offset + fl/2 - 1; 3352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->ov_offset += fl/2 + nl; 3362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } else { 3372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut1 = pOut0 + (fl - 1); 3382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project nrSamples += fl/2 + nl; 3392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* output samples before window crossing point NR .. TL/2. -overlap[TL/2-NR..TL/2-NR-FL/2] + current[NR..TL/2] */ 3422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* output samples after window crossing point TL/2 .. TL/2+FL/2. -overlap[0..FL/2] - current[TL/2..FL/2] */ 3432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pCurr = pSpec + tl - fl/2; 3442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<fl/2; i++) { 3452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL x0, x1; 3462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project cplxMult(&x1, &x0, *pCurr++, - *pOvl--, pWindow[i]); 3482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pOut0 = IMDCT_SCALE_DBL(x0); 3492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pOut1 = IMDCT_SCALE_DBL(-x1); 3502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut0 ++; 3512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut1 --; 3522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut0 += (fl/2); 3542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* NL output samples TL/2+FL/2..TL. - current[FL/2..0] */ 3562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut1 += (fl/2) + 1; 3572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pCurr = pSpec + tl - fl/2 - 1; 3582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<nl; i++) { 3592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL x = - (*pCurr--); 3602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *pOut1 = IMDCT_SCALE_DBL(x); 3612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOut1 ++; 3622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Set overlap source pointer for next window pOvl = pSpec + tl/2 - 1; */ 3652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOvl = pSpec + tl/2 - 1; 3662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Previous window values. */ 3682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_nr = nr; 3692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_fr = fr; 3702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_tl = tl; 3712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project hMdct->prev_wrs = wrs; 3722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Save overlap */ 3752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOvl = hMdct->overlap.freq + hMdct->ov_size - tl/2; 3772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(pOvl >= hMdct->overlap.time + hMdct->ov_offset); 3782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(tl/2 <= hMdct->ov_size); 3792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<tl/2; i++) { 3802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project pOvl[i] = spectrum[i+(nSpec-1)*tl]; 3812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return nrSamples; 3842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 3852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 386