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Diffstat (limited to 'libAACenc/src/transform.cpp')
| -rw-r--r-- | libAACenc/src/transform.cpp | 388 |
1 files changed, 209 insertions, 179 deletions
diff --git a/libAACenc/src/transform.cpp b/libAACenc/src/transform.cpp index 690b82e..08b1c2f 100644 --- a/libAACenc/src/transform.cpp +++ b/libAACenc/src/transform.cpp @@ -1,74 +1,85 @@ - -/* ----------------------------------------------------------------------------------------------------------- +/* ----------------------------------------------------------------------------- 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. +© 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. +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: +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 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 +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. +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. +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." +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. +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. +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. +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 @@ -79,9 +90,11 @@ Am Wolfsmantel 33 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. @@ -90,175 +103,192 @@ amm-info@iis.fraunhofer.de 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; +#if defined(__arm__) +#endif - const FIXP_WTP * RESTRICT pLeftWindowPart; - const FIXP_WTP * RESTRICT pRightWindowPart; +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; - /* - * MDCT scale: - * + 1: fMultDiv2() in windowing. - * + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC. - */ - *mdctData_e = 1+1; + UINT numSpec; + UINT numMdctLines; + UINT offset; + int fr; /* fr: right window slope length */ + SHORT mdctData_e[8]; - tl = frameLength; timeData = pTimeData; - switch( blockType ) { + 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: - { - int offset = (windowShape == LOL_WINDOW) ? ((frameLength * 3)>>2) : 0; - fl = frameLength - offset; - fr = frameLength - offset; - } - break; case STOP_WINDOW: - fl = frameLength >> 3; - fr = frameLength; + fr = frameLength - offset; 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); + fr = frameLength >> 3; 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); - } + mdct_block(mdctPers, timeData, frameLength, mdctData, numSpec, numMdctLines, + FDKgetWindowSlope(fr, windowShape), fr, mdctData_e); - /* 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 (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]; - if (filterType == FB_ELD) - { - const FIXP_WTB *pWindowELD=NULL; - int i, N = frameLength, L = frameLength; + return 0; +} - if (frameLength == 512) { - pWindowELD = ELDAnalysis512; - } else { - pWindowELD = ELDAnalysis480; - } +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; - for(i=0;i<N/4;i++) - { - FIXP_DBL z0, outval; + INT i; - 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)); + /* 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; - 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)); + timeData = pTimeData; - overlapAddBuffer[N/2+i] = overlapAddBuffer[i]; + if (blockType != LONG_WINDOW) { + return -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)); + /* + * MDCT scale: + * + 1: fMultDiv2() in windowing. + * + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC. + */ + *mdctData_e = 1 + 1; - mdctData[N-1-i] = outval; - overlapAddBuffer[N+N/2-1-i] = outval; - } + 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; + 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); + 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)); + 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[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)); + 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; - } + mdctData[N - 1 - i] = outval; + overlapAddBuffer[N + N / 2 - 1 - i] = outval; } - - dct_IV(mdctData, tl, mdctData_e); + dct_IV(mdctData, frameLength, mdctData_e); *prevWindowShape = windowShape; return 0; } - |