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+/* -----------------------------------------------------------------------------
+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;
+}
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