2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
5 © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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.
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.
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.
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.
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:
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.
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.
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
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.
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."
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.
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
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.
73 5. CONTACT INFORMATION
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
78 91058 Erlangen, Germany
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
86 \brief Low Power Profile Transposer,
92 #include "sbrdecoder.h"
98 #define QMF_OUT_SCALE 8
103 #define MAX_NOISE_ENVELOPES 2
104 #define MAX_NOISE_COEFFS 5
105 #define MAX_NUM_NOISE_VALUES (MAX_NOISE_ENVELOPES * MAX_NOISE_COEFFS)
106 #define MAX_NUM_LIMITERS 12
108 /* Set MAX_ENVELOPES to the largest value of all supported BSFORMATs
109 by overriding MAX_ENVELOPES in the correct order: */
110 #define MAX_ENVELOPES_HEAAC 5
111 #define MAX_ENVELOPES MAX_ENVELOPES_HEAAC
113 #define MAX_FREQ_COEFFS 48
114 #define MAX_FREQ_COEFFS_FS44100 35
115 #define MAX_FREQ_COEFFS_FS48000 32
118 #define MAX_NUM_ENVELOPE_VALUES (MAX_ENVELOPES * MAX_FREQ_COEFFS)
120 #define MAX_GAIN_EXP 34
121 /* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_EXP)
123 #define MAX_GAIN_CONCEAL_EXP 1
124 /* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_CONCEAL_EXP) in concealment case (0dB) */
131 #define MAX_INVF_BANDS MAX_NOISE_COEFFS
133 #define MAX_NUM_PATCHES 6
134 #define SHIFT_START_SB 1 /*!< lowest subband of source range */
142 INVF_SWITCHED
/* not a real choice but used here to control behaviour */
147 /** parameter set for one single patch */
149 UCHAR sourceStartBand
; /*!< first band in lowbands where to take the samples from */
150 UCHAR sourceStopBand
; /*!< first band in lowbands which is not included in the patch anymore */
151 UCHAR guardStartBand
; /*!< first band in highbands to be filled with zeros in order to
152 reduce interferences between patches */
153 UCHAR targetStartBand
; /*!< first band in highbands to be filled with whitened lowband signal */
154 UCHAR targetBandOffs
; /*!< difference between 'startTargetBand' and 'startSourceBand' */
155 UCHAR numBandsInPatch
; /*!< number of consecutive bands in this one patch */
159 /** whitening factors for different levels of whitening
160 need to be initialized corresponding to crossover frequency */
162 FIXP_DBL off
; /*!< bw factor for signal OFF */
163 FIXP_DBL transitionLevel
;
164 FIXP_DBL lowLevel
; /*!< bw factor for signal LOW_LEVEL */
165 FIXP_DBL midLevel
; /*!< bw factor for signal MID_LEVEL */
166 FIXP_DBL highLevel
; /*!< bw factor for signal HIGH_LEVEL */
170 /*! The transposer settings are calculated on a header reset and are shared by both channels. */
172 UCHAR nCols
; /*!< number subsamples of a codec frame */
173 UCHAR noOfPatches
; /*!< number of patches */
174 UCHAR lbStartPatching
; /*!< first band of lowbands that will be patched */
175 UCHAR lbStopPatching
; /*!< first band that won't be patched anymore*/
176 UCHAR bwBorders
[MAX_NUM_NOISE_VALUES
]; /*!< spectral bands with different inverse filtering levels */
178 PATCH_PARAM patchParam
[MAX_NUM_PATCHES
]; /*!< new parameter set for patching */
179 WHITENING_FACTORS whFactors
; /*!< the pole moving factors for certain whitening levels as indicated
180 in the bitstream depending on the crossover frequency */
181 UCHAR overlap
; /*!< Overlap size */
182 } TRANSPOSER_SETTINGS
;
187 TRANSPOSER_SETTINGS
*pSettings
; /*!< Common settings for both channels */
188 FIXP_DBL bwVectorOld
[MAX_NUM_PATCHES
]; /*!< pole moving factors of past frame */
189 FIXP_DBL lpcFilterStatesReal
[LPC_ORDER
][(32)]; /*!< pointer array to save filter states */
190 FIXP_DBL lpcFilterStatesImag
[LPC_ORDER
][(32)]; /*!< pointer array to save filter states */
194 typedef SBR_LPP_TRANS
*HANDLE_SBR_LPP_TRANS
;
197 void lppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans
,
198 QMF_SCALE_FACTOR
*sbrScaleFactor
,
199 FIXP_DBL
**qmfBufferReal
,
201 FIXP_DBL
*degreeAlias
,
202 FIXP_DBL
**qmfBufferImag
,
205 const int firstSlotOffset
,
206 const int lastSlotOffset
,
207 const int nInvfBands
,
208 INVF_MODE
*sbr_invf_mode
,
209 INVF_MODE
*sbr_invf_mode_prev
214 createLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans
,
215 TRANSPOSER_SETTINGS
*pSettings
,
216 const int highBandStartSb
,
222 UCHAR
*noiseBandTable
,
223 const int noNoiseBands
,
230 resetLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans
,
231 UCHAR highBandStartSb
,
234 UCHAR
*noiseBandTable
,
241 #endif /* _LPP_TRANS_H */