1
2/* -----------------------------------------------------------------------------------------------------------
3Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5© Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Förderung 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#ifndef __HYBRID_H
85#define __HYBRID_H
86
87#include "sbrdecoder.h"
88
89
90#define HYBRID_FILTER_LENGTH  13
91#define HYBRID_FILTER_DELAY    6
92
93
94#define FAST_FILTER2
95#define FAST_FILTER4
96#define FAST_FILTER8
97#define FAST_FILTER12
98
99#define FFT_IDX_R(a)  (2*a)
100#define FFT_IDX_I(a)  (2*a+1)
101
102#define FIXP_FFT_IDX_R(a)   (a<<1)
103#define FIXP_FFT_IDX_I(a)  ((a<<1) + 1)
104
105
106typedef enum {
107
108  HYBRID_2_REAL     = 2,
109  HYBRID_4_CPLX     = 4,
110  HYBRID_8_CPLX     = 8,
111  HYBRID_12_CPLX    = 12
112
113} HYBRID_RES;
114
115typedef struct
116{
117  SCHAR   nQmfBands;
118  SCHAR   frameSize;
119  SCHAR   qmfBufferMove;
120
121  UCHAR   pResolution[3];
122
123  FIXP_DBL mQmfBufferRealSlot[3][HYBRID_FILTER_LENGTH];   /**< Stores old Qmf samples. */
124  FIXP_DBL mQmfBufferImagSlot[3][HYBRID_FILTER_LENGTH];
125  SCHAR sf_mQmfBuffer;
126
127} HYBRID;
128
129typedef HYBRID *HANDLE_HYBRID;
130
131void
132fillHybridDelayLine( FIXP_DBL **fixpQmfReal,
133                     FIXP_DBL **fixpQmfImag,
134                     FIXP_DBL   fixpHybridLeftR[12],
135                     FIXP_DBL   fixpHybridLeftI[12],
136                     FIXP_DBL   fixpHybridRightR[12],
137                     FIXP_DBL   fixpHybridRightI[12],
138                     HANDLE_HYBRID hHybrid );
139
140void
141slotBasedHybridAnalysis ( FIXP_DBL *fixpQmfReal,
142                          FIXP_DBL *fixpQmfImag,
143
144                          FIXP_DBL  *fixpHybridReal,
145                          FIXP_DBL  *fixpHybridImag,
146
147                          HANDLE_HYBRID hHybrid);
148
149
150void
151slotBasedHybridSynthesis ( FIXP_DBL  *fixpHybridReal,
152                           FIXP_DBL  *fixpHybridImag,
153
154                           FIXP_DBL  *fixpQmfReal,
155                           FIXP_DBL  *fixpQmfImag,
156
157                           HANDLE_HYBRID hHybrid );
158
159SBR_ERROR InitHybridFilterBank ( HANDLE_HYBRID  hHybrid,
160                                 SCHAR frameSize,
161                                 SCHAR noBands,
162                                 const UCHAR *pResolution );
163
164
165#endif /* __HYBRID_H */
166