| |
| /* ----------------------------------------------------------------------------------------------------------- |
| 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. |
| |
| 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 Audio Encoder ************************** |
| |
| Initial author: M.Werner |
| contents/description: Short block grouping |
| |
| ******************************************************************************/ |
| #include "psy_const.h" |
| #include "interface.h" |
| |
| /* |
| * this routine does not work in-place |
| */ |
| |
| 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; |
| |
| /* for short blocks: regroup spectrum and */ |
| /* group energies and thresholds according to grouping */ |
| C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024)); |
| |
| /* 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)) |
| } |