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Diffstat (limited to 'libAACenc/src/transform.cpp')
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diff --git a/libAACenc/src/transform.cpp b/libAACenc/src/transform.cpp deleted file mode 100644 index 690b82e..0000000 --- a/libAACenc/src/transform.cpp +++ /dev/null @@ -1,264 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -Software License for The Fraunhofer FDK AAC Codec Library for Android - -© Copyright 1995 - 2013 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 ------------------------------------------------------------------------------------------------------------ */ - -/***************************************************************************** - - 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" - -INT FDKaacEnc_Transform_Real (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 - See FDK_tools/doc/intern/mdct.tex for more detail. */ - int tl, fl, nl, fr, nr; - - const FIXP_WTP * RESTRICT pLeftWindowPart; - const FIXP_WTP * RESTRICT pRightWindowPart; - - /* - * MDCT scale: - * + 1: fMultDiv2() in windowing. - * + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC. - */ - *mdctData_e = 1+1; - - tl = frameLength; - timeData = pTimeData; - - switch( blockType ) { - case LONG_WINDOW: - { - int offset = (windowShape == LOL_WINDOW) ? ((frameLength * 3)>>2) : 0; - fl = frameLength - offset; - fr = frameLength - offset; - } - break; - case STOP_WINDOW: - fl = frameLength >> 3; - fr = frameLength; - break; - case START_WINDOW: /* or StopStartSequence */ - fl = frameLength; - fr = frameLength >> 3; - break; - case SHORT_WINDOW: - fl = fr = frameLength >> 3; - tl >>= 3; - timeData = pTimeData + 3*fl + (fl/2); - break; - default: - FDK_ASSERT(0); - return -1; - break; - } - - /* Taken from FDK_tools/src/mdct.cpp Derive NR and NL */ - nr = (tl - fr)>>1; - nl = (tl - fl)>>1; - - pLeftWindowPart = FDKgetWindowSlope(fl, *prevWindowShape); - pRightWindowPart = FDKgetWindowSlope(fr, windowShape); - - /* windowing */ - if (filterType != FB_ELD) - { - /* Left window slope offset */ - for (i=0; i<nl ; i++) - { -#if SAMPLE_BITS == DFRACT_BITS /* SPC_BITS and DFRACT_BITS should be equal. */ - mdctData[(tl/2)+i] = - (FIXP_DBL) timeData[tl-i-1] >> ( 1 ); -#else - mdctData[(tl/2)+i] = - (FIXP_DBL) timeData[tl-i-1] << (DFRACT_BITS - SAMPLE_BITS - 1); -#endif - } - /* Left window slope */ - for (i=0; i<fl/2; i++) - { - FIXP_DBL tmp0; - tmp0 = fMultDiv2((FIXP_PCM)timeData[i+nl], pLeftWindowPart[i].v.im); - mdctData[(tl/2)+i+nl] = fMultSubDiv2(tmp0, (FIXP_PCM)timeData[tl-nl-i-1], pLeftWindowPart[i].v.re); - } - - /* Right window slope offset */ - for(i=0; i<nr; i++) - { -#if SAMPLE_BITS == DFRACT_BITS /* This should be SPC_BITS instead of DFRACT_BITS. */ - mdctData[(tl/2)-1-i] = - (FIXP_DBL) timeData[tl+i] >> (1); -#else - mdctData[(tl/2)-1-i] = - (FIXP_DBL) timeData[tl+i] << (DFRACT_BITS - SAMPLE_BITS - 1); -#endif - } - /* Right window slope */ - for (i=0; i<fr/2; i++) - { - FIXP_DBL tmp1; - tmp1 = fMultDiv2((FIXP_PCM)timeData[tl+nr+i], pRightWindowPart[i].v.re); - mdctData[(tl/2)-nr-i-1] = -fMultAddDiv2(tmp1, (FIXP_PCM)timeData[(tl*2)-nr-i-1], pRightWindowPart[i].v.im); - } - } - - if (filterType == FB_ELD) - { - const FIXP_WTB *pWindowELD=NULL; - int i, N = frameLength, L = frameLength; - - if (frameLength == 512) { - pWindowELD = ELDAnalysis512; - } else { - pWindowELD = ELDAnalysis480; - } - - 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, tl, mdctData_e); - - *prevWindowShape = windowShape; - - return 0; -} - |