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Diffstat (limited to 'fdk-aac/libAACenc/src/grp_data.cpp')
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diff --git a/fdk-aac/libAACenc/src/grp_data.cpp b/fdk-aac/libAACenc/src/grp_data.cpp new file mode 100644 index 0000000..bc9d85f --- /dev/null +++ b/fdk-aac/libAACenc/src/grp_data.cpp @@ -0,0 +1,264 @@ +/* ----------------------------------------------------------------------------- +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 +----------------------------------------------------------------------------- */ + +/**************************** AAC encoder library ****************************** + + Author(s): M.Werner + + Description: Short block grouping + +*******************************************************************************/ + +#include "psy_const.h" +#include "interface.h" + +/* + * this routine does not work in-place + */ + +/* + * Don't use fAddSaturate2() because it looses one bit accuracy which is + * usefull for quality. + */ +static inline FIXP_DBL nrgAddSaturate(const FIXP_DBL a, const FIXP_DBL b) { + return ((a >= (FIXP_DBL)MAXVAL_DBL - b) ? (FIXP_DBL)MAXVAL_DBL : (a + b)); +} + +void FDKaacEnc_groupShortData(FIXP_DBL *mdctSpectrum, /* in-out */ + SFB_THRESHOLD *sfbThreshold, /* in-out */ + SFB_ENERGY *sfbEnergy, /* in-out */ + SFB_ENERGY *sfbEnergyMS, /* in-out */ + SFB_ENERGY *sfbSpreadEnergy, const INT sfbCnt, + const INT sfbActive, const INT *sfbOffset, + const FIXP_DBL *sfbMinSnrLdData, + INT *groupedSfbOffset, /* out */ + INT *maxSfbPerGroup, /* out */ + FIXP_DBL *groupedSfbMinSnrLdData, + const INT noOfGroups, const INT *groupLen, + const INT granuleLength) { + INT i, j; + INT line; /* counts through lines */ + INT sfb; /* counts through scalefactor bands */ + INT grp; /* counts through groups */ + INT wnd; /* counts through windows in a group */ + INT offset; /* needed in sfbOffset grouping */ + INT highestSfb; + INT granuleLength_short = granuleLength / TRANS_FAC; + + C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024)) + + /* for short blocks: regroup spectrum and */ + /* group energies and thresholds according to grouping */ + + /* calculate maxSfbPerGroup */ + highestSfb = 0; + for (wnd = 0; wnd < TRANS_FAC; wnd++) { + for (sfb = sfbActive - 1; sfb >= highestSfb; sfb--) { + for (line = sfbOffset[sfb + 1] - 1; line >= sfbOffset[sfb]; line--) { + if (mdctSpectrum[wnd * granuleLength_short + line] != + FL2FXCONST_SPC(0.0)) + break; /* this band is not completely zero */ + } + if (line >= sfbOffset[sfb]) break; /* this band was not completely zero */ + } + highestSfb = fixMax(highestSfb, sfb); + } + highestSfb = highestSfb > 0 ? highestSfb : 0; + *maxSfbPerGroup = highestSfb + 1; + + /* calculate groupedSfbOffset */ + i = 0; + offset = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive + 1; sfb++) { + groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp]; + } + i += sfbCnt - sfb; + offset += groupLen[grp] * granuleLength_short; + } + groupedSfbOffset[i++] = granuleLength; + + /* calculate groupedSfbMinSnr */ + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb]; + } + i += sfbCnt - sfb; + } + + /* sum up sfbThresholds */ + wnd = 0; + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb]; + for (j = 1; j < groupLen[grp]; j++) { + thresh = nrgAddSaturate(thresh, sfbThreshold->Short[wnd + j][sfb]); + } + sfbThreshold->Long[i++] = thresh; + } + i += sfbCnt - sfb; + wnd += groupLen[grp]; + } + + /* sum up sfbEnergies left/right */ + wnd = 0; + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + FIXP_DBL energy = sfbEnergy->Short[wnd][sfb]; + for (j = 1; j < groupLen[grp]; j++) { + energy = nrgAddSaturate(energy, sfbEnergy->Short[wnd + j][sfb]); + } + sfbEnergy->Long[i++] = energy; + } + i += sfbCnt - sfb; + wnd += groupLen[grp]; + } + + /* sum up sfbEnergies mid/side */ + wnd = 0; + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb]; + for (j = 1; j < groupLen[grp]; j++) { + energy = nrgAddSaturate(energy, sfbEnergyMS->Short[wnd + j][sfb]); + } + sfbEnergyMS->Long[i++] = energy; + } + i += sfbCnt - sfb; + wnd += groupLen[grp]; + } + + /* sum up sfbSpreadEnergies */ + wnd = 0; + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb]; + for (j = 1; j < groupLen[grp]; j++) { + energy = nrgAddSaturate(energy, sfbSpreadEnergy->Short[wnd + j][sfb]); + } + sfbSpreadEnergy->Long[i++] = energy; + } + i += sfbCnt - sfb; + wnd += groupLen[grp]; + } + + /* re-group spectrum */ + wnd = 0; + i = 0; + for (grp = 0; grp < noOfGroups; grp++) { + for (sfb = 0; sfb < sfbActive; sfb++) { + int width = sfbOffset[sfb + 1] - sfbOffset[sfb]; + FIXP_DBL *pMdctSpectrum = + &mdctSpectrum[sfbOffset[sfb]] + wnd * granuleLength_short; + for (j = 0; j < groupLen[grp]; j++) { + FIXP_DBL *pTmp = pMdctSpectrum; + for (line = width; line > 0; line--) { + tmpSpectrum[i++] = *pTmp++; + } + pMdctSpectrum += granuleLength_short; + } + } + i += (groupLen[grp] * (sfbOffset[sfbCnt] - sfbOffset[sfb])); + wnd += groupLen[grp]; + } + + FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength * sizeof(FIXP_DBL)); + + C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024)) +} |