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1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6 
7  1.    INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12 
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18 
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28 
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33 
34 2.    COPYRIGHT LICENSE
35 
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39 
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42 
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48 
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51 
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54 
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60 
61 3.    NO PATENT LICENSE
62 
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67 
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70 
71 4.    DISCLAIMER
72 
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83 
84 5.    CONTACT INFORMATION
85 
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90 
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94 
95 /**************************** SBR decoder library ******************************
96 
97    Author(s):
98 
99    Description:
100 
101 *******************************************************************************/
102 
103 #ifndef HBE_H
104 #define HBE_H
105 
106 #include "sbrdecoder.h"
107 
108 #ifndef QMF_SYNTH_CHANNELS
109 #define QMF_SYNTH_CHANNELS (64)
110 #endif
111 
112 #define HBE_QMF_FILTER_STATE_ANA_SIZE (400)
113 #define HBE_QMF_FILTER_STATE_SYN_SIZE (200)
114 
115 #ifndef MAX_NUM_PATCHES_HBE
116 #define MAX_NUM_PATCHES_HBE (6)
117 #endif
118 #define MAX_STRETCH_HBE (4)
119 
120 typedef enum {
121   KEEP_STATES_SYNCED_OFF = 0,    /*!< normal QMF transposer behaviour */
122   KEEP_STATES_SYNCED_NORMAL = 1, /*!< QMF transposer called for syncing of
123                                     states the last 8/14 slots are calculated in
124                                     case next frame is HBE */
125   KEEP_STATES_SYNCED_OUTDIFF =
126       2, /*!< QMF transposer behaviour as in normal case, but the calculated
127               slots are directly written to overlap area of buffer; only used in
128               resetSbrDec function */
129   KEEP_STATES_SYNCED_NOOUT =
130       3 /*!< QMF transposer is called for syncing of states only, not output
131              is generated at all; only used in resetSbrDec function */
132 } KEEP_STATES_SYNCED_MODE;
133 
134 struct hbeTransposer {
135   FIXP_DBL anaQmfStates[HBE_QMF_FILTER_STATE_ANA_SIZE];
136   FIXP_QSS synQmfStates[HBE_QMF_FILTER_STATE_SYN_SIZE];
137 
138   int xOverQmf[MAX_NUM_PATCHES_HBE];
139 
140   int maxStretch;
141   int timeDomainWinLen;
142   int qmfInBufSize;
143   int qmfOutBufSize;
144   int noCols;
145   int noChannels;
146   int startBand;
147   int stopBand;
148   int bSbr41;
149 
150   LONG *inBuf_F;
151   FIXP_DBL **qmfInBufReal_F;
152   FIXP_DBL **qmfInBufImag_F;
153 
154   FIXP_DBL *qmfBufferCodecTempSlot_F;
155 
156   QMF_FILTER_BANK HBEAnalysiscQMF;
157   QMF_FILTER_BANK HBESynthesisQMF;
158 
159   FIXP_DBL const *synthesisQmfPreModCos_F;
160   FIXP_DBL const *synthesisQmfPreModSin_F;
161 
162   FIXP_DBL **qmfHBEBufReal_F;
163   FIXP_DBL **qmfHBEBufImag_F;
164 
165   int bXProducts[MAX_STRETCH_HBE];
166 
167   int kstart;
168   int synthSize;
169 
170   int highband_exp[2];
171   int target_exp[2];
172 };
173 
174 typedef struct hbeTransposer *HANDLE_HBE_TRANSPOSER;
175 
176 SBR_ERROR QmfTransposerCreate(HANDLE_HBE_TRANSPOSER *hQmfTransposer,
177                               const int frameSize, int bDisableCrossProducts,
178                               int bSbr41);
179 
180 SBR_ERROR QmfTransposerReInit(HANDLE_HBE_TRANSPOSER hQmfTransposer,
181                               UCHAR *FreqBandTable[2], UCHAR NSfb[2]);
182 
183 void QmfTransposerClose(HANDLE_HBE_TRANSPOSER hQmfTransposer);
184 
185 void QmfTransposerApply(HANDLE_HBE_TRANSPOSER hQmfTransposer,
186                         FIXP_DBL **qmfBufferCodecReal,
187                         FIXP_DBL **qmfBufferCodecImag, int nColsIn,
188                         FIXP_DBL **ppQmfBufferOutReal_F,
189                         FIXP_DBL **ppQmfBufferOutImag_F,
190                         FIXP_DBL lpcFilterStatesReal[2 + (3 * (4))][(64)],
191                         FIXP_DBL lpcFilterStatesImag[2 + (3 * (4))][(64)],
192                         int pitchInBins, int scale_lb, int scale_hbe,
193                         int *scale_hb, int timeStep, int firstSlotOffsset,
194                         int ov_len,
195                         KEEP_STATES_SYNCED_MODE keepStatesSyncedMode);
196 
197 int *GetxOverBandQmfTransposer(HANDLE_HBE_TRANSPOSER hQmfTransposer);
198 
199 int Get41SbrQmfTransposer(HANDLE_HBE_TRANSPOSER hQmfTransposer);
200 #endif /* HBE_H */
201