1
2/* -----------------------------------------------------------------------------------------------------------
3Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5� Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6  All rights reserved.
7
8 1.    INTRODUCTION
9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12
13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16of the MPEG specifications.
17
18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20individually for the purpose of encoding or decoding bit streams in products that are compliant with
21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23software may already be covered under those patent licenses when it is used for those licensed purposes only.
24
25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27applications information and documentation.
28
292.    COPYRIGHT LICENSE
30
31Redistribution and use in source and binary forms, with or without modification, are permitted without
32payment of copyright license fees provided that you satisfy the following conditions:
33
34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35your modifications thereto in source code form.
36
37You must retain the complete text of this software license in the documentation and/or other materials
38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40modifications thereto to recipients of copies in binary form.
41
42The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43prior written permission.
44
45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46software or your modifications thereto.
47
48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49and 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
533.    NO PATENT LICENSE
54
55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57respect to this software.
58
59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60by appropriate patent licenses.
61
624.    DISCLAIMER
63
64This 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
66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69or business interruption, however caused and on any theory of liability, whether in contract, strict
70liability, or tort (including negligence), arising in any way out of the use of this software, even if
71advised of the possibility of such damage.
72
735.    CONTACT INFORMATION
74
75Fraunhofer Institute for Integrated Circuits IIS
76Attention: Audio and Multimedia Departments - FDK AAC LL
77Am Wolfsmantel 33
7891058 Erlangen, Germany
79
80www.iis.fraunhofer.de/amm
81amm-info@iis.fraunhofer.de
82----------------------------------------------------------------------------------------------------------- */
83
84/*!
85  \file
86  \brief  missing harmonics detection header file
87*/
88
89#ifndef __MH_DETECT_H
90#define __MH_DETECT_H
91
92#include "sbr_encoder.h"
93#include "fram_gen.h"
94
95typedef struct
96{
97  FIXP_DBL thresHoldDiff;      /*!< threshold for tonality difference */
98  FIXP_DBL thresHoldDiffGuide; /*!< threshold for tonality difference for the guide */
99  FIXP_DBL thresHoldTone;      /*!< threshold for tonality for a sine */
100  FIXP_DBL invThresHoldTone;
101  FIXP_DBL thresHoldToneGuide; /*!< threshold for tonality for a sine for the guide */
102  FIXP_DBL sfmThresSbr;        /*!< tonality flatness measure threshold for the SBR signal.*/
103  FIXP_DBL sfmThresOrig;       /*!< tonality flatness measure threshold for the original signal.*/
104  FIXP_DBL decayGuideOrig;     /*!< decay value of the tonality value of the guide for the tone. */
105  FIXP_DBL decayGuideDiff;     /*!< decay value of the tonality value of the guide for the tonality difference. */
106  FIXP_DBL derivThresMaxLD64;      /*!< threshold for detecting LP character in a signal. */
107  FIXP_DBL derivThresBelowLD64;    /*!< threshold for detecting LP character in a signal. */
108  FIXP_DBL derivThresAboveLD64;    /*!< threshold for detecting LP character in a signal. */
109}THRES_HOLDS;
110
111typedef struct
112{
113  INT deltaTime;            /*!< maximum allowed transient distance (from frame border in number of qmf subband sample)
114                                 for a frame to be considered a transient frame.*/
115  THRES_HOLDS thresHolds;   /*!< the thresholds used for detection. */
116  INT maxComp;              /*!< maximum alllowed compensation factor for the envelope data. */
117}DETECTOR_PARAMETERS_MH;
118
119typedef struct
120{
121  FIXP_DBL *guideVectorDiff;
122  FIXP_DBL *guideVectorOrig;
123  UCHAR* guideVectorDetected;
124}GUIDE_VECTORS;
125
126
127typedef struct
128{
129  INT qmfNoChannels;
130  INT nSfb;
131  INT sampleFreq;
132  INT previousTransientFlag;
133  INT previousTransientFrame;
134  INT previousTransientPos;
135
136  INT noVecPerFrame;
137  INT transientPosOffset;
138
139  INT move;
140  INT totNoEst;
141  INT noEstPerFrame;
142  INT timeSlots;
143
144  UCHAR *guideScfb;
145  UCHAR *prevEnvelopeCompensation;
146  UCHAR *detectionVectors[MAX_NO_OF_ESTIMATES];
147  FIXP_DBL tonalityDiff[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
148  FIXP_DBL sfmOrig[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
149  FIXP_DBL sfmSbr[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
150  const DETECTOR_PARAMETERS_MH *mhParams;
151  GUIDE_VECTORS guideVectors[MAX_NO_OF_ESTIMATES];
152}
153SBR_MISSING_HARMONICS_DETECTOR;
154
155typedef SBR_MISSING_HARMONICS_DETECTOR *HANDLE_SBR_MISSING_HARMONICS_DETECTOR;
156
157void
158FDKsbrEnc_SbrMissingHarmonicsDetectorQmf(HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector,
159                               FIXP_DBL ** pQuotaBuffer,
160                               INT ** pSignBuffer,
161                               SCHAR *indexVector,
162                               const SBR_FRAME_INFO *pFrameInfo,
163                               const UCHAR* pTranInfo,
164                               INT* pAddHarmonicsFlag,
165                               UCHAR* pAddHarmonicsScaleFactorBands,
166                               const UCHAR* freqBandTable,
167                               INT nSfb,
168                               UCHAR * envelopeCompensation,
169                               FIXP_DBL *pNrgVector);
170
171INT
172FDKsbrEnc_CreateSbrMissingHarmonicsDetector (
173                                   HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMHDet,
174                                   INT chan);
175
176INT
177FDKsbrEnc_InitSbrMissingHarmonicsDetector(
178                                  HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector,
179                                  INT sampleFreq,
180                                  INT frameSize,
181                                  INT nSfb,
182                                  INT qmfNoChannels,
183                                  INT totNoEst,
184                                  INT move,
185                                  INT noEstPerFrame,
186                                  UINT sbrSyntaxFlags);
187
188void
189FDKsbrEnc_DeleteSbrMissingHarmonicsDetector (HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector);
190
191
192INT
193FDKsbrEnc_ResetSbrMissingHarmonicsDetector (HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMissingHarmonicsDetector,
194                                   INT nSfb);
195
196#endif
197