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Diffstat (limited to 'libAACenc/src/chaosmeasure.cpp')
| -rw-r--r-- | libAACenc/src/chaosmeasure.cpp | 220 |
1 files changed, 125 insertions, 95 deletions
diff --git a/libAACenc/src/chaosmeasure.cpp b/libAACenc/src/chaosmeasure.cpp index 4e56e9e..664284b 100644 --- a/libAACenc/src/chaosmeasure.cpp +++ b/libAACenc/src/chaosmeasure.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 @@ -79,14 +90,15 @@ Am Wolfsmantel 33 www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ------------------------------------------------------------------------------------------------------------ */ +----------------------------------------------------------------------------- */ + +/**************************** AAC encoder library ****************************** -/******************************** MPEG Audio Encoder ************************** + Author(s): M. Werner - Initial author: M. Werner - contents/description: Chaos measure calculation + Description: Chaos measure calculation -******************************************************************************/ +*******************************************************************************/ #include "chaosmeasure.h" @@ -94,40 +106,63 @@ amm-info@iis.fraunhofer.de functionname: FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast description: Eberlein method of chaos measure calculation by high-pass filtering amplitude spectrum - A special case of FDKaacEnc_CalculateChaosMeasureTonalGeneric -- - highly optimized + A special case of FDKaacEnc_CalculateChaosMeasureTonalGeneric +-- highly optimized *****************************************************************************/ -static void -FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( FIXP_DBL *RESTRICT paMDCTDataNM0, - INT numberOfLines, - FIXP_DBL *RESTRICT chaosMeasure ) -{ +static void FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( + FIXP_DBL *RESTRICT paMDCTDataNM0, INT numberOfLines, + FIXP_DBL *RESTRICT chaosMeasure) { INT i, j; /* calculate chaos measure by "peak filter" */ - for (i=0; i<2; i++) { - /* make even and odd pass through data */ - FIXP_DBL left,center; /* left, center tap of filter */ - - left = (FIXP_DBL)((LONG)paMDCTDataNM0[i]^((LONG)paMDCTDataNM0[i]>>(DFRACT_BITS-1))); - center = (FIXP_DBL)((LONG)paMDCTDataNM0[i+2]^((LONG)paMDCTDataNM0[i+2]>>(DFRACT_BITS-1))); - - for (j = i+2; j < numberOfLines - 2; j+=2) { - FIXP_DBL right = (FIXP_DBL)((LONG)paMDCTDataNM0[j+2]^((LONG)paMDCTDataNM0[j+2]>>(DFRACT_BITS-1))); - FIXP_DBL tmp = (left>>1)+(right>>1); - - if (tmp < center ) { - INT leadingBits = CntLeadingZeros(center)-1; - tmp = schur_div(tmp<<leadingBits, center<<leadingBits, 8); - chaosMeasure[j] = fMult(tmp,tmp); - } - else { - chaosMeasure[j] = (FIXP_DBL)MAXVAL_DBL; - } - - left = center; - center = right; + /* make even and odd pass through data */ + FIXP_DBL left_0_div2, + center_0; /* left, center tap of filter, even numbered */ + FIXP_DBL left_1_div2, center_1; /* left, center tap of filter, odd numbered */ + + left_0_div2 = (FIXP_DBL)(((LONG)paMDCTDataNM0[0] ^ + ((LONG)paMDCTDataNM0[0] >> (DFRACT_BITS - 1))) >> + 1); + left_1_div2 = (FIXP_DBL)(((LONG)paMDCTDataNM0[1] ^ + ((LONG)paMDCTDataNM0[1] >> (DFRACT_BITS - 1))) >> + 1); + center_0 = (FIXP_DBL)((LONG)paMDCTDataNM0[2] ^ + ((LONG)paMDCTDataNM0[2] >> (DFRACT_BITS - 1))); + center_1 = (FIXP_DBL)((LONG)paMDCTDataNM0[3] ^ + ((LONG)paMDCTDataNM0[3] >> (DFRACT_BITS - 1))); + + for (j = 2; j < numberOfLines - 2; j += 2) { + FIXP_DBL right_0 = + (FIXP_DBL)((LONG)paMDCTDataNM0[j + 2] ^ + ((LONG)paMDCTDataNM0[j + 2] >> (DFRACT_BITS - 1))); + FIXP_DBL tmp_0 = left_0_div2 + (right_0 >> 1); + FIXP_DBL right_1 = + (FIXP_DBL)((LONG)paMDCTDataNM0[j + 3] ^ + ((LONG)paMDCTDataNM0[j + 3] >> (DFRACT_BITS - 1))); + FIXP_DBL tmp_1 = left_1_div2 + (right_1 >> 1); + + if (tmp_0 < center_0) { + INT leadingBits = CntLeadingZeros(center_0) - 1; + tmp_0 = schur_div(tmp_0 << leadingBits, center_0 << leadingBits, 8); + tmp_0 = fMult(tmp_0, tmp_0); + } else { + tmp_0 = (FIXP_DBL)MAXVAL_DBL; + } + chaosMeasure[j + 0] = tmp_0; + left_0_div2 = center_0 >> 1; + center_0 = right_0; + + if (tmp_1 < center_1) { + INT leadingBits = CntLeadingZeros(center_1) - 1; + tmp_1 = schur_div(tmp_1 << leadingBits, center_1 << leadingBits, 8); + tmp_1 = fMult(tmp_1, tmp_1); + } else { + tmp_1 = (FIXP_DBL)MAXVAL_DBL; } + + left_1_div2 = center_1 >> 1; + center_1 = right_1; + chaosMeasure[j + 1] = tmp_1; } /* provide chaos measure for first few lines */ @@ -135,11 +170,10 @@ FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( FIXP_DBL *RESTRICT paMDCTDat chaosMeasure[1] = chaosMeasure[2]; /* provide chaos measure for last few lines */ - for (i = (numberOfLines-3); i < numberOfLines; i++) + for (i = (numberOfLines - 3); i < numberOfLines; i++) chaosMeasure[i] = FL2FXCONST_DBL(0.5); } - /***************************************************************************** functionname: FDKaacEnc_CalculateChaosMeasure description: calculates a chaosmeasure for every line, different methods @@ -148,14 +182,10 @@ FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( FIXP_DBL *RESTRICT paMDCTDat input: MDCT data, number of lines output: chaosMeasure *****************************************************************************/ -void -FDKaacEnc_CalculateChaosMeasure( FIXP_DBL *paMDCTDataNM0, - INT numberOfLines, - FIXP_DBL *chaosMeasure ) +void FDKaacEnc_CalculateChaosMeasure(FIXP_DBL *paMDCTDataNM0, INT numberOfLines, + FIXP_DBL *chaosMeasure) { - FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( paMDCTDataNM0, - numberOfLines, - chaosMeasure ); + FDKaacEnc_FDKaacEnc_CalculateChaosMeasurePeakFast( + paMDCTDataNM0, numberOfLines, chaosMeasure); } - |