| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*! |
| \file |
| \brief Noise floor estimation structs and prototypes |
| */ |
| |
| #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. */ |
| int 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 |
