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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
+----------------------------------------------------------------------------- */
+
+/**************************** SBR encoder library ******************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+/*!
+  \file
+  \brief  Noise floor estimation structs and prototypes $Revision: 92790 $
+*/
+
+#ifndef NF_EST_H
+#define NF_EST_H
+
+#include "sbr_encoder.h"
+#include "fram_gen.h"
+
+#define NF_SMOOTHING_LENGTH 4 /*!< Smoothing length of the noise floors. */
+
+typedef struct {
+  FIXP_DBL
+  prevNoiseLevels[NF_SMOOTHING_LENGTH]
+                 [MAX_NUM_NOISE_VALUES]; /*!< The previous noise levels. */
+  FIXP_DBL noiseFloorOffset
+      [MAX_NUM_NOISE_VALUES];   /*!< Noise floor offset, scaled with
+                                   NOISE_FLOOR_OFFSET_SCALING */
+  const FIXP_DBL *smoothFilter; /*!< Smoothing filter to use. */
+  FIXP_DBL ana_max_level;       /*!< Max level allowed.   */
+  FIXP_DBL weightFac; /*!< Weightening factor for the difference between orig
+                         and sbr. */
+  INT freqBandTableQmf[MAX_NUM_NOISE_VALUES +
+                       1]; /*!< Frequncy band table for the noise floor bands.*/
+  INT noNoiseBands;        /*!< Number of noisebands. */
+  INT noiseBands;          /*!< NoiseBands switch 4 bit.*/
+  INT timeSlots;           /*!< Number of timeslots in a frame. */
+  INVF_MODE diffThres;     /*!< Threshold value to control the inverse filtering
+                              decision */
+} SBR_NOISE_FLOOR_ESTIMATE;
+
+typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE;
+
+void FDKsbrEnc_sbrNoiseFloorEstimateQmf(
+    HANDLE_SBR_NOISE_FLOOR_ESTIMATE
+        h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
+                                  */
+    const SBR_FRAME_INFO
+        *frame_info, /*!< Time frequency grid of the current frame. */
+    FIXP_DBL
+        *noiseLevels, /*!< Pointer to vector to store the noise levels in.*/
+    FIXP_DBL **quotaMatrixOrig, /*!< Matrix holding the quota values of the
+                                   original. */
+    SCHAR *indexVector,         /*!< Index vector to obtain the patched data. */
+    INT missingHarmonicsFlag,   /*!< Flag indicating if a strong tonal component
+                                   will be missing. */
+    INT startIndex,             /*!< Start index. */
+    UINT numberOfEstimatesPerFrame, /*!< The number of tonality estimates per
+                                       frame. */
+    INT transientFrame, /*!< A flag indicating if a transient is present. */
+    INVF_MODE *pInvFiltLevels, /*!< Pointer to the vector holding the inverse
+                                  filtering levels. */
+    UINT sbrSyntaxFlags);
+
+INT FDKsbrEnc_InitSbrNoiseFloorEstimate(
+    HANDLE_SBR_NOISE_FLOOR_ESTIMATE
+        h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
+                                  */
+    INT ana_max_level,           /*!< Maximum level of the adaptive noise. */
+    const UCHAR *freqBandTable,  /*!< Frequany band table. */
+    INT nSfb,                    /*!< Number of frequency bands. */
+    INT noiseBands,              /*!< Number of noise bands per octave. */
+    INT noiseFloorOffset,        /*!< Noise floor offset. */
+    INT timeSlots,               /*!< Number of time slots in a frame. */
+    UINT useSpeechConfig /*!< Flag: adapt tuning parameters according to speech
+                          */
+);
+
+INT FDKsbrEnc_resetSbrNoiseFloorEstimate(
+    HANDLE_SBR_NOISE_FLOOR_ESTIMATE
+        h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
+                                  */
+    const UCHAR *freqBandTable,  /*!< Frequany band table. */
+    INT nSfb); /*!< Number of bands in the frequency band table. */
+
+void FDKsbrEnc_deleteSbrNoiseFloorEstimate(
+    HANDLE_SBR_NOISE_FLOOR_ESTIMATE
+        h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
+                                   */
+
+#endif