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1 
2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
4 
5 � Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6   All rights reserved.
7 
8  1.    INTRODUCTION
9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12 
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16 of the MPEG specifications.
17 
18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
24 
25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27 applications information and documentation.
28 
29 2.    COPYRIGHT LICENSE
30 
31 Redistribution and use in source and binary forms, with or without modification, are permitted without
32 payment of copyright license fees provided that you satisfy the following conditions:
33 
34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35 your modifications thereto in source code form.
36 
37 You must retain the complete text of this software license in the documentation and/or other materials
38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40 modifications thereto to recipients of copies in binary form.
41 
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
44 
45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46 software or your modifications thereto.
47 
48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49 and the date of any change. For modified versions of the FDK AAC Codec, the term
50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
52 
53 3.    NO PATENT LICENSE
54 
55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57 respect to this software.
58 
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
61 
62 4.    DISCLAIMER
63 
64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69 or business interruption, however caused and on any theory of liability, whether in contract, strict
70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
71 advised of the possibility of such damage.
72 
73 5.    CONTACT INFORMATION
74 
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
77 Am Wolfsmantel 33
78 91058 Erlangen, Germany
79 
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
83 
84 /*!
85   \file
86   \brief  Noise floor estimation structs and prototypes
87 */
88 
89 #ifndef __NF_EST_H
90 #define __NF_EST_H
91 
92 #include "sbr_encoder.h"
93 #include "fram_gen.h"
94 
95 #define NF_SMOOTHING_LENGTH 4                   /*!< Smoothing length of the noise floors. */
96 
97 typedef struct
98 {
99   FIXP_DBL prevNoiseLevels[NF_SMOOTHING_LENGTH][MAX_NUM_NOISE_VALUES]; /*!< The previous noise levels. */
100   FIXP_DBL noiseFloorOffset[MAX_NUM_NOISE_VALUES];   /*!< Noise floor offset, scaled with NOISE_FLOOR_OFFSET_SCALING */
101   const FIXP_DBL *smoothFilter;                      /*!< Smoothing filter to use. */
102   FIXP_DBL ana_max_level;                            /*!< Max level allowed.   */
103   FIXP_DBL weightFac;                                /*!< Weightening factor for the difference between orig and sbr. */
104   INT freqBandTableQmf[MAX_NUM_NOISE_VALUES + 1]; /*!< Frequncy band table for the noise floor bands.*/
105   INT noNoiseBands;                               /*!< Number of noisebands. */
106   INT noiseBands;                                 /*!< NoiseBands switch 4 bit.*/
107   INT timeSlots;                                  /*!< Number of timeslots in a frame. */
108   INVF_MODE diffThres;                            /*!< Threshold value to control the inverse filtering decision */
109 }
110 SBR_NOISE_FLOOR_ESTIMATE;
111 
112 typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE;
113 
114 void
115 FDKsbrEnc_sbrNoiseFloorEstimateQmf(HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */
116                          const SBR_FRAME_INFO *frame_info,   /*!< Time frequency grid of the current frame. */
117                          FIXP_DBL *noiseLevels,              /*!< Pointer to vector to store the noise levels in.*/
118                          FIXP_DBL **quotaMatrixOrig,         /*!< Matrix holding the quota values of the original. */
119                          SCHAR* indexVector,                 /*!< Index vector to obtain the patched data. */
120                          INT missingHarmonicsFlag,           /*!< Flag indicating if a strong tonal component will be missing. */
121                          INT startIndex,                     /*!< Start index. */
122                          UINT numberOfEstimatesPerFrame,     /*!< The number of tonality estimates per frame. */
123                          INT transientFrame,                 /*!< A flag indicating if a transient is present. */
124                          INVF_MODE* pInvFiltLevels,          /*!< Pointer to the vector holding the inverse filtering levels. */
125                          UINT sbrSyntaxFlags
126                          );
127 
128 INT
129 FDKsbrEnc_InitSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE  h_sbrNoiseFloorEstimate,   /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */
130                              INT ana_max_level,                       /*!< Maximum level of the adaptive noise. */
131                              const UCHAR *freqBandTable,      /*!< Frequany band table. */
132                              INT nSfb,                                /*!< Number of frequency bands. */
133                              INT noiseBands,                          /*!< Number of noise bands per octave. */
134                              INT noiseFloorOffset,                    /*!< Noise floor offset. */
135                              INT timeSlots,                           /*!< Number of time slots in a frame. */
136                              UINT useSpeechConfig             /*!< Flag: adapt tuning parameters according to speech */
137                              );
138 
139 INT
140 FDKsbrEnc_resetSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */
141                             const UCHAR *freqBandTable,   /*!< Frequany band table. */
142                             INT nSfb);                            /*!< Number of bands in the frequency band table. */
143 
144 void
145 FDKsbrEnc_deleteSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */
146 
147 #endif
148