/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. This FDK AAC Codec software is intended to be used on a wide variety of Android devices. AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part of the MPEG specifications. Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners individually for the purpose of encoding or decoding bit streams in products that are compliant with the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec software may already be covered under those patent licenses when it is used for those licensed purposes only. Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional applications information and documentation. 2. COPYRIGHT LICENSE Redistribution and use in source and binary forms, with or without modification, are permitted without payment of copyright license fees provided that you satisfy the following conditions: You must retain the complete text of this software license in redistributions of the FDK AAC Codec or your modifications thereto in source code form. You must retain the complete text of this software license in the documentation and/or other materials provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. You must make available free of charge copies of the complete source code of the FDK AAC Codec and your modifications thereto to recipients of copies in binary form. The name of Fraunhofer may not be used to endorse or promote products derived from this library without prior written permission. You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec software or your modifications thereto. Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software and the date of any change. For modified versions of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 3. NO PATENT LICENSE NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with respect to this software. You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized by appropriate patent licenses. 4. DISCLAIMER This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, including but not limited to procurement of substitute goods or services; loss of use, data, or profits, or business interruption, however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence), arising in any way out of the use of this software, even if advised of the possibility of such damage. 5. CONTACT INFORMATION Fraunhofer Institute for Integrated Circuits IIS Attention: Audio and Multimedia Departments - FDK AAC LL Am Wolfsmantel 33 91058 Erlangen, Germany www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ----------------------------------------------------------------------------- */ /**************************** AAC encoder library ****************************** Author(s): Tobias Chalupka Description: FDKaacLdEnc_MdctTransform480: The module FDKaacLdEnc_MdctTransform will perform the MDCT. The MDCT supports the sine window and the zero padded window. The algorithm of the MDCT can be divided in Windowing, PreModulation, Fft and PostModulation. *******************************************************************************/ #include "transform.h" #include "dct.h" #include "psy_const.h" #include "aacEnc_rom.h" #include "FDK_tools_rom.h" #if defined(__arm__) #endif INT FDKaacEnc_Transform_Real(const INT_PCM *pTimeData, FIXP_DBL *RESTRICT mdctData, const INT blockType, const INT windowShape, INT *prevWindowShape, H_MDCT mdctPers, const INT frameLength, INT *pMdctData_e, INT filterType) { const INT_PCM *RESTRICT timeData; UINT numSpec; UINT numMdctLines; UINT offset; int fr; /* fr: right window slope length */ SHORT mdctData_e[8]; timeData = pTimeData; if (blockType == SHORT_WINDOW) { numSpec = 8; numMdctLines = frameLength >> 3; } else { numSpec = 1; numMdctLines = frameLength; } offset = (windowShape == LOL_WINDOW) ? ((frameLength * 3) >> 2) : 0; switch (blockType) { case LONG_WINDOW: case STOP_WINDOW: fr = frameLength - offset; break; case START_WINDOW: /* or StopStartSequence */ case SHORT_WINDOW: fr = frameLength >> 3; break; default: FDK_ASSERT(0); return -1; } mdct_block(mdctPers, timeData, frameLength, mdctData, numSpec, numMdctLines, FDKgetWindowSlope(fr, windowShape), fr, mdctData_e); if (blockType == SHORT_WINDOW) { if (!(mdctData_e[0] == mdctData_e[1] && mdctData_e[1] == mdctData_e[2] && mdctData_e[2] == mdctData_e[3] && mdctData_e[3] == mdctData_e[4] && mdctData_e[4] == mdctData_e[5] && mdctData_e[5] == mdctData_e[6] && mdctData_e[6] == mdctData_e[7])) { return -1; } } *prevWindowShape = windowShape; *pMdctData_e = mdctData_e[0]; return 0; } INT FDKaacEnc_Transform_Real_Eld(const INT_PCM *pTimeData, FIXP_DBL *RESTRICT mdctData, const INT blockType, const INT windowShape, INT *prevWindowShape, const INT frameLength, INT *mdctData_e, INT filterType, FIXP_DBL *RESTRICT overlapAddBuffer) { const INT_PCM *RESTRICT timeData; INT i; /* tl: transform length fl: left window slope length nl: left window slope offset fr: right window slope length nr: right window slope offset */ const FIXP_WTB *pWindowELD = NULL; int N = frameLength; int L = frameLength; timeData = pTimeData; if (blockType != LONG_WINDOW) { return -1; } /* * MDCT scale: * + 1: fMultDiv2() in windowing. * + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC. */ *mdctData_e = 1 + 1; switch (frameLength) { case 512: pWindowELD = ELDAnalysis512; break; case 480: pWindowELD = ELDAnalysis480; break; case 256: pWindowELD = ELDAnalysis256; *mdctData_e += 1; break; case 240: pWindowELD = ELDAnalysis240; *mdctData_e += 1; break; case 128: pWindowELD = ELDAnalysis128; *mdctData_e += 2; break; case 120: pWindowELD = ELDAnalysis120; *mdctData_e += 2; break; default: FDK_ASSERT(0); return -1; } for (i = 0; i < N / 4; i++) { FIXP_DBL z0, outval; z0 = (fMult((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i], pWindowELD[N / 2 - 1 - i]) << (WTS0 - 1)) + (fMult((FIXP_PCM)timeData[L + N * 3 / 4 + i], pWindowELD[N / 2 + i]) << (WTS0 - 1)); outval = (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i], pWindowELD[N + N / 2 - 1 - i]) >> (-WTS1)); outval += (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 + i], pWindowELD[N + N / 2 + i]) >> (-WTS1)); outval += (fMultDiv2(overlapAddBuffer[N / 2 + i], pWindowELD[2 * N + i]) >> (-WTS2 - 1)); overlapAddBuffer[N / 2 + i] = overlapAddBuffer[i]; overlapAddBuffer[i] = z0; mdctData[i] = overlapAddBuffer[N / 2 + i] + (fMultDiv2(overlapAddBuffer[N + N / 2 - 1 - i], pWindowELD[2 * N + N / 2 + i]) >> (-WTS2 - 1)); mdctData[N - 1 - i] = outval; overlapAddBuffer[N + N / 2 - 1 - i] = outval; } for (i = N / 4; i < N / 2; i++) { FIXP_DBL z0, outval; z0 = fMult((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i], pWindowELD[N / 2 - 1 - i]) << (WTS0 - 1); outval = (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i], pWindowELD[N + N / 2 - 1 - i]) >> (-WTS1)); outval += (fMultDiv2(overlapAddBuffer[N / 2 + i], pWindowELD[2 * N + i]) >> (-WTS2 - 1)); overlapAddBuffer[N / 2 + i] = overlapAddBuffer[i] + (fMult((FIXP_PCM)timeData[L - N / 4 + i], pWindowELD[N / 2 + i]) << (WTS0 - 1)); overlapAddBuffer[i] = z0; mdctData[i] = overlapAddBuffer[N / 2 + i] + (fMultDiv2(overlapAddBuffer[N + N / 2 - 1 - i], pWindowELD[2 * N + N / 2 + i]) >> (-WTS2 - 1)); mdctData[N - 1 - i] = outval; overlapAddBuffer[N + N / 2 - 1 - i] = outval; } dct_IV(mdctData, frameLength, mdctData_e); *prevWindowShape = windowShape; return 0; }