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Diffstat (limited to 'libSACdec/src/sac_smoothing.cpp')
| -rw-r--r-- | libSACdec/src/sac_smoothing.cpp | 295 |
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diff --git a/libSACdec/src/sac_smoothing.cpp b/libSACdec/src/sac_smoothing.cpp new file mode 100644 index 0000000..bee6551 --- /dev/null +++ b/libSACdec/src/sac_smoothing.cpp @@ -0,0 +1,295 @@ +/* ----------------------------------------------------------------------------- +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 +----------------------------------------------------------------------------- */ + +/*********************** MPEG surround decoder library ************************* + + Author(s): + + Description: SAC Dec parameter smoothing + +*******************************************************************************/ + +#include "sac_dec.h" +#include "sac_bitdec.h" +#include "sac_smoothing.h" +#include "sac_rom.h" + +/******************************************************************************* + Functionname: calcFilterCoeff + ******************************************************************************* + + Description: + + Arguments: + + Input: + + Output: + + +*******************************************************************************/ +static FIXP_DBL calcFilterCoeff__FDK(spatialDec *self, int ps, + const SPATIAL_BS_FRAME *frame) { + int dSlots; + FIXP_DBL delta; + + dSlots = frame->paramSlot[ps] - self->smoothState->prevParamSlot; + + if (dSlots <= 0) { + dSlots += self->timeSlots; + } + + delta = fDivNorm(dSlots, self->smgTime[ps]); + + return delta; +} + +/******************************************************************************* + Functionname: getSmoothOnOff + ******************************************************************************* + + Description: + + Arguments: + + Input: + + Output: + + +*******************************************************************************/ +static int getSmoothOnOff(spatialDec *self, int ps, int pb) { + int smoothBand = 0; + + smoothBand = self->smgData[ps][pb]; + + return smoothBand; +} + +void SpatialDecSmoothM1andM2(spatialDec *self, const SPATIAL_BS_FRAME *frame, + int ps) { + FIXP_DBL delta__FDK; + FIXP_DBL one_minus_delta__FDK; + + int pb, row, col; + int residualBands = 0; + + if (self->residualCoding) { + int i; + int boxes = self->numOttBoxes; + for (i = 0; i < boxes; i++) { + if (self->residualBands[i] > residualBands) { + residualBands = self->residualBands[i]; + } + } + } + + delta__FDK = calcFilterCoeff__FDK(self, ps, frame); + if (delta__FDK == /*FL2FXCONST_DBL(1.0f)*/ (FIXP_DBL)MAXVAL_DBL) + one_minus_delta__FDK = FL2FXCONST_DBL(0.0f); + else if (delta__FDK == FL2FXCONST_DBL(0.0f)) + one_minus_delta__FDK = /*FL2FXCONST_DBL(1.0f)*/ (FIXP_DBL)MAXVAL_DBL; + else + one_minus_delta__FDK = (FL2FXCONST_DBL(0.5f) - (delta__FDK >> 1)) << 1; + + for (pb = 0; pb < self->numParameterBands; pb++) { + int smoothBand; + + smoothBand = getSmoothOnOff(self, ps, pb); + + if (smoothBand && (pb >= residualBands)) { + for (row = 0; row < self->numM2rows; row++) { + for (col = 0; col < self->numVChannels; col++) { + self->M2Real__FDK[row][col][pb] = + ((fMultDiv2(delta__FDK, self->M2Real__FDK[row][col][pb]) + + fMultDiv2(one_minus_delta__FDK, + self->M2RealPrev__FDK[row][col][pb])) + << 1); + if (0 || (self->phaseCoding == 3)) { + self->M2Imag__FDK[row][col][pb] = + ((fMultDiv2(delta__FDK, self->M2Imag__FDK[row][col][pb]) + + fMultDiv2(one_minus_delta__FDK, + self->M2ImagPrev__FDK[row][col][pb])) + << 1); + } + } + } + } + } + self->smoothState->prevParamSlot = frame->paramSlot[ps]; +} + +/* init states */ +void initParameterSmoothing(spatialDec *self) { + self->smoothState->prevParamSlot = 0; +} + +void SpatialDecSmoothOPD(spatialDec *self, const SPATIAL_BS_FRAME *frame, + int ps) { + int pb; + int dSlots; + FIXP_DBL delta__FDK; + FIXP_DBL one_minus_delta__FDK; + FIXP_DBL *phaseLeftSmooth__FDK = self->smoothState->opdLeftState__FDK; + FIXP_DBL *phaseRightSmooth__FDK = self->smoothState->opdRightState__FDK; + int quantCoarse; + + quantCoarse = frame->IPDLosslessData[0].bsQuantCoarseXXX[ps]; + + if (frame->OpdSmoothingMode == 0) { + FDKmemcpy(phaseLeftSmooth__FDK, self->PhaseLeft__FDK, + self->numParameterBands * sizeof(FIXP_DBL)); + FDKmemcpy(phaseRightSmooth__FDK, self->PhaseRight__FDK, + self->numParameterBands * sizeof(FIXP_DBL)); + } else { + if (ps == 0) { + dSlots = frame->paramSlot[ps] + 1; + } else { + dSlots = frame->paramSlot[ps] - frame->paramSlot[ps - 1]; + } + + delta__FDK = (FIXP_DBL)((INT)(FL2FXCONST_DBL(0.0078125f)) * dSlots); + + if (delta__FDK == (FIXP_DBL)MAXVAL_DBL /*FL2FXCONST_DBL(1.0f)*/) + one_minus_delta__FDK = FL2FXCONST_DBL(0.0f); + else if (delta__FDK == FL2FXCONST_DBL(0.0f)) + one_minus_delta__FDK = (FIXP_DBL)MAXVAL_DBL /*FL2FXCONST_DBL(1.0f)*/; + else + one_minus_delta__FDK = (FL2FXCONST_DBL(0.5f) - (delta__FDK >> 1)) << 1; + + for (pb = 0; pb < self->numParameterBands; pb++) { + FIXP_DBL tmpL, tmpR, tmp; + + tmpL = self->PhaseLeft__FDK[pb]; + tmpR = self->PhaseRight__FDK[pb]; + + while (tmpL > phaseLeftSmooth__FDK[pb] + PI__IPD) tmpL -= PI__IPD << 1; + while (tmpL < phaseLeftSmooth__FDK[pb] - PI__IPD) tmpL += PI__IPD << 1; + while (tmpR > phaseRightSmooth__FDK[pb] + PI__IPD) tmpR -= PI__IPD << 1; + while (tmpR < phaseRightSmooth__FDK[pb] - PI__IPD) tmpR += PI__IPD << 1; + + phaseLeftSmooth__FDK[pb] = + fMult(delta__FDK, tmpL) + + fMult(one_minus_delta__FDK, phaseLeftSmooth__FDK[pb]); + phaseRightSmooth__FDK[pb] = + fMult(delta__FDK, tmpR) + + fMult(one_minus_delta__FDK, phaseRightSmooth__FDK[pb]); + + tmp = (((tmpL >> 1) - (tmpR >> 1)) - ((phaseLeftSmooth__FDK[pb] >> 1) - + (phaseRightSmooth__FDK[pb] >> 1))) + << 1; + while (tmp > PI__IPD) tmp -= PI__IPD << 1; + while (tmp < -PI__IPD) tmp += PI__IPD << 1; + if (fixp_abs(tmp) > fMult((quantCoarse ? FL2FXCONST_DBL(50.f / 180.f) + : FL2FXCONST_DBL(25.f / 180.f)), + PI__IPD)) { + phaseLeftSmooth__FDK[pb] = tmpL; + phaseRightSmooth__FDK[pb] = tmpR; + } + + while (phaseLeftSmooth__FDK[pb] > PI__IPD << 1) + phaseLeftSmooth__FDK[pb] -= PI__IPD << 1; + while (phaseLeftSmooth__FDK[pb] < (FIXP_DBL)0) + phaseLeftSmooth__FDK[pb] += PI__IPD << 1; + while (phaseRightSmooth__FDK[pb] > PI__IPD << 1) + phaseRightSmooth__FDK[pb] -= PI__IPD << 1; + while (phaseRightSmooth__FDK[pb] < (FIXP_DBL)0) + phaseRightSmooth__FDK[pb] += PI__IPD << 1; + + self->PhaseLeft__FDK[pb] = phaseLeftSmooth__FDK[pb]; + self->PhaseRight__FDK[pb] = phaseRightSmooth__FDK[pb]; + } + } + return; +} |