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authorMatthias P. Braendli <matthias.braendli@mpb.li>2016-09-10 20:15:44 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2016-09-10 20:15:44 +0200
commit14c7b800eaa23e9da7c92c7c4df397d0c191f097 (patch)
treed840b6ec41ff74d1184ca1dcd7731d08f1e9ebbb /libAACenc/src/pre_echo_control.cpp
parent78a801e4d716c6f2403cc56cf6c5b6f138f24b2f (diff)
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Remove FDK-AAC
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diff --git a/libAACenc/src/pre_echo_control.cpp b/libAACenc/src/pre_echo_control.cpp
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-
-/* -----------------------------------------------------------------------------------------------------------
-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: Pre echo control
-
-******************************************************************************/
-
-#include "pre_echo_control.h"
-#include "psy_configuration.h"
-
-void FDKaacEnc_InitPreEchoControl(FIXP_DBL *RESTRICT pbThresholdNm1,
- INT *calcPreEcho,
- INT numPb,
- FIXP_DBL *RESTRICT sfbPcmQuantThreshold,
- INT *mdctScalenm1)
-{
- *mdctScalenm1 = PCM_QUANT_THR_SCALE>>1;
-
- FDKmemcpy(pbThresholdNm1, sfbPcmQuantThreshold, numPb*sizeof(FIXP_DBL));
-
- *calcPreEcho = 1;
-}
-
-
-void FDKaacEnc_PreEchoControl(FIXP_DBL *RESTRICT pbThresholdNm1,
- INT calcPreEcho,
- INT numPb,
- INT maxAllowedIncreaseFactor,
- FIXP_SGL minRemainingThresholdFactor,
- FIXP_DBL *RESTRICT pbThreshold,
- INT mdctScale,
- INT *mdctScalenm1)
-{
- int i;
- FIXP_DBL tmpThreshold1, tmpThreshold2;
- int scaling;
-
- /* If lastWindowSequence in previous frame was start- or stop-window,
- skip preechocontrol calculation */
- if (calcPreEcho==0) {
- /* copy thresholds to internal memory */
- FDKmemcpy(pbThresholdNm1, pbThreshold, numPb*sizeof(FIXP_DBL));
- *mdctScalenm1 = mdctScale;
- return;
- }
-
- if ( mdctScale > *mdctScalenm1 ) {
- /* if current thresholds are downscaled more than the ones from the last block */
- scaling = 2*(mdctScale-*mdctScalenm1);
- for(i = 0; i < numPb; i++) {
-
- /* multiplication with return data type fract ist equivalent to int multiplication */
- FDK_ASSERT(scaling>=0);
- tmpThreshold1 = maxAllowedIncreaseFactor * (pbThresholdNm1[i]>>scaling);
- tmpThreshold2 = fMult(minRemainingThresholdFactor, pbThreshold[i]);
-
- FIXP_DBL tmp = pbThreshold[i];
-
- /* copy thresholds to internal memory */
- pbThresholdNm1[i] = tmp;
-
- tmp = fixMin(tmp, tmpThreshold1);
- pbThreshold[i] = fixMax(tmp, tmpThreshold2);
- }
- }
- else {
- /* if thresholds of last block are more downscaled than the current ones */
- scaling = 2*(*mdctScalenm1-mdctScale);
- for(i = 0; i < numPb; i++) {
-
- /* multiplication with return data type fract ist equivalent to int multiplication */
- tmpThreshold1 = (maxAllowedIncreaseFactor>>1) * pbThresholdNm1[i];
- tmpThreshold2 = fMult(minRemainingThresholdFactor, pbThreshold[i]);
-
- /* copy thresholds to internal memory */
- pbThresholdNm1[i] = pbThreshold[i];
-
- FDK_ASSERT(scaling>=0);
- if((pbThreshold[i]>>(scaling+1)) > tmpThreshold1) {
- pbThreshold[i] = tmpThreshold1<<(scaling+1);
- }
- pbThreshold[i] = fixMax(pbThreshold[i], tmpThreshold2);
- }
- }
-
- *mdctScalenm1 = mdctScale;
-}