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Diffstat (limited to 'libSBRenc/src/sbr_misc.cpp')
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diff --git a/libSBRenc/src/sbr_misc.cpp b/libSBRenc/src/sbr_misc.cpp new file mode 100644 index 0000000..c44be22 --- /dev/null +++ b/libSBRenc/src/sbr_misc.cpp @@ -0,0 +1,272 @@ + +/* ----------------------------------------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2012 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 +----------------------------------------------------------------------------------------------------------- */ + +/*! + \file + \brief Sbr miscellaneous helper functions +*/ +#include "sbr_misc.h" + + +void FDKsbrEnc_Shellsort_fract (FIXP_DBL *in, INT n) +{ + FIXP_DBL v; + INT i, j; + INT inc = 1; + + do + inc = 3 * inc + 1; + while (inc <= n); + + do { + inc = inc / 3; + for (i = inc + 1; i <= n; i++) { + v = in[i-1]; + j = i; + while (in[j-inc-1] > v) { + in[j-1] = in[j-inc-1]; + j -= inc; + if (j <= inc) + break; + } + in[j-1] = v; + } + } while (inc > 1); + +} + +/* Sorting routine */ +void FDKsbrEnc_Shellsort_int (INT *in, INT n) +{ + + INT i, j, v; + INT inc = 1; + + do + inc = 3 * inc + 1; + while (inc <= n); + + do { + inc = inc / 3; + for (i = inc + 1; i <= n; i++) { + v = in[i-1]; + j = i; + while (in[j-inc-1] > v) { + in[j-1] = in[j-inc-1]; + j -= inc; + if (j <= inc) + break; + } + in[j-1] = v; + } + } while (inc > 1); + +} + + + +/******************************************************************************* + Functionname: FDKsbrEnc_AddVecLeft + ******************************************************************************* + + Description: + + Arguments: INT* dst, INT* length_dst, INT* src, INT length_src + + Return: none + +*******************************************************************************/ +void +FDKsbrEnc_AddVecLeft (INT *dst, INT *length_dst, INT *src, INT length_src) +{ + INT i; + + for (i = length_src - 1; i >= 0; i--) + FDKsbrEnc_AddLeft (dst, length_dst, src[i]); +} + + +/******************************************************************************* + Functionname: FDKsbrEnc_AddLeft + ******************************************************************************* + + Description: + + Arguments: INT* vector, INT* length_vector, INT value + + Return: none + +*******************************************************************************/ +void +FDKsbrEnc_AddLeft (INT *vector, INT *length_vector, INT value) +{ + INT i; + + for (i = *length_vector; i > 0; i--) + vector[i] = vector[i - 1]; + vector[0] = value; + (*length_vector)++; +} + + +/******************************************************************************* + Functionname: FDKsbrEnc_AddRight + ******************************************************************************* + + Description: + + Arguments: INT* vector, INT* length_vector, INT value + + Return: none + +*******************************************************************************/ +void +FDKsbrEnc_AddRight (INT *vector, INT *length_vector, INT value) +{ + vector[*length_vector] = value; + (*length_vector)++; +} + + + +/******************************************************************************* + Functionname: FDKsbrEnc_AddVecRight + ******************************************************************************* + + Description: + + Arguments: INT* dst, INT* length_dst, INT* src, INT length_src) + + Return: none + +*******************************************************************************/ +void +FDKsbrEnc_AddVecRight (INT *dst, INT *length_dst, INT *src, INT length_src) +{ + INT i; + for (i = 0; i < length_src; i++) + FDKsbrEnc_AddRight (dst, length_dst, src[i]); +} + + +/***************************************************************************** + + functionname: FDKsbrEnc_LSI_divide_scale_fract + + description: Calculates division with best precision and scales the result. + + return: num*scale/denom + +*****************************************************************************/ +FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, FIXP_DBL scale) +{ + FIXP_DBL tmp = FL2FXCONST_DBL(0.0f); + if (num != FL2FXCONST_DBL(0.0f)) { + + INT shiftCommon; + INT shiftNum = CountLeadingBits(num); + INT shiftDenom = CountLeadingBits(denom); + INT shiftScale = CountLeadingBits(scale); + + num = num << shiftNum; + scale = scale << shiftScale; + + tmp = fMultDiv2(num,scale); + + if ( denom > (tmp >> fixMin(shiftNum+shiftScale-1,(DFRACT_BITS-1))) ) { + denom = denom << shiftDenom; + tmp = schur_div(tmp,denom,15); + shiftCommon = fixMin((shiftNum-shiftDenom+shiftScale-1),(DFRACT_BITS-1)); + if (shiftCommon < 0) + tmp <<= -shiftCommon; + else + tmp >>= shiftCommon; + } + else { + tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL; + } + } + + return (tmp); +} + |