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 ----------------------------------------------------------------------------------------------------------- */
84 /******************************** MPEG Audio Encoder **************************
86 Initial author: Alex Groeschel
87 contents/description: Temporal noise shaping
89 ******************************************************************************/
94 #include "common_fix.h"
96 #include "psy_const.h"
100 #define PI 3.1415926535897931f
105 * This bitfield defines which TNS features are enabled
106 * The TNS mask is composed of 4 bits.
107 * tnsMask |= 0x1; activate TNS short blocks
108 * tnsMask |= 0x2; activate TNS for long blocks
109 * tnsMask |= 0x4; activate TNS PEAK tool for short blocks
110 * tnsMask |= 0x8; activate TNS PEAK tool for long blocks
112 #define TNS_ENABLE_MASK 0xf
114 /* TNS max filter order for Low Complexity MPEG4 profile */
115 #define TNS_MAX_ORDER 12
118 #define MAX_NUM_OF_FILTERS 2
121 typedef struct{ /*stuff that is tabulated dependent on bitrate etc. */
122 INT filterEnabled
[MAX_NUM_OF_FILTERS
];
123 INT threshOn
[MAX_NUM_OF_FILTERS
]; /* min. prediction gain for using tns TABUL*/
124 INT tnsLimitOrder
[MAX_NUM_OF_FILTERS
]; /* Limit for TNS order TABUL*/
125 INT tnsFilterDirection
[MAX_NUM_OF_FILTERS
]; /* Filtering direction, 0=up, 1=down TABUL */
126 INT acfSplit
[MAX_NUM_OF_FILTERS
];
127 INT seperateFiltersAllowed
;
129 }TNS_CONFIG_TABULATED
;
133 typedef struct { /*assigned at InitTime*/
134 TNS_CONFIG_TABULATED confTab
;
136 INT maxOrder
; /* max. order of tns filter */
138 FIXP_DBL acfWindow
[MAX_NUM_OF_FILTERS
][TNS_MAX_ORDER
+3+1];
139 /* now some things that only probably can be done at Init time;
140 could be they have to be split up for each individual (short) window or
142 INT lpcStartBand
[MAX_NUM_OF_FILTERS
];
143 INT lpcStartLine
[MAX_NUM_OF_FILTERS
];
155 typedef struct{ /*changed at runTime*/
156 TNS_SUBBLOCK_INFO subBlockInfo
[TRANS_FAC
];
157 FIXP_DBL ratioMultTable
[TRANS_FAC
][MAX_SFB_SHORT
];
160 typedef struct{ /*changed at runTime*/
161 TNS_SUBBLOCK_INFO subBlockInfo
;
162 FIXP_DBL ratioMultTable
[MAX_SFB_LONG
];
165 /* can be implemented as union */
166 typedef shouldBeUnion
{
168 TNS_DATA_SHORT Short
;
173 TNS_DATA_RAW dataRaw
;
179 INT numOfFilters
[TRANS_FAC
];
180 INT coefRes
[TRANS_FAC
];
181 INT length
[TRANS_FAC
][MAX_NUM_OF_FILTERS
];
182 INT order
[TRANS_FAC
][MAX_NUM_OF_FILTERS
];
183 INT direction
[TRANS_FAC
][MAX_NUM_OF_FILTERS
];
184 INT coefCompress
[TRANS_FAC
][MAX_NUM_OF_FILTERS
];
185 /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */
186 /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */
187 /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */
188 INT coef
[TRANS_FAC
][MAX_NUM_OF_FILTERS
][TNS_MAX_ORDER
];
191 INT
FDKaacEnc_FreqToBandWithRounding(
194 const INT numOfBands
,
195 const INT
*bandStartOffset