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: M.Werner
87 contents/description: Short block grouping
89 ******************************************************************************/
90 #include "psy_const.h"
91 #include "interface.h"
94 * this routine does not work in-place
97 static inline FIXP_DBL
nrgAddSaturate(const FIXP_DBL a
, const FIXP_DBL b
) {
98 return ( (a
>=(FIXP_DBL
)MAXVAL_DBL
-b
) ? (FIXP_DBL
)MAXVAL_DBL
: (a
+ b
) );
102 FDKaacEnc_groupShortData(FIXP_DBL
*mdctSpectrum
, /* in-out */
103 SFB_THRESHOLD
*sfbThreshold
, /* in-out */
104 SFB_ENERGY
*sfbEnergy
, /* in-out */
105 SFB_ENERGY
*sfbEnergyMS
, /* in-out */
106 SFB_ENERGY
*sfbSpreadEnergy
,
109 const INT
*sfbOffset
,
110 const FIXP_DBL
*sfbMinSnrLdData
,
111 INT
*groupedSfbOffset
, /* out */
112 INT
*maxSfbPerGroup
, /* out */
113 FIXP_DBL
*groupedSfbMinSnrLdData
,
114 const INT noOfGroups
,
116 const INT granuleLength
)
119 INT line
; /* counts through lines */
120 INT sfb
; /* counts through scalefactor bands */
121 INT grp
; /* counts through groups */
122 INT wnd
; /* counts through windows in a group */
123 INT offset
; /* needed in sfbOffset grouping */
126 INT granuleLength_short
= granuleLength
/TRANS_FAC
;
128 /* for short blocks: regroup spectrum and */
129 /* group energies and thresholds according to grouping */
130 C_ALLOC_SCRATCH_START(tmpSpectrum
, FIXP_DBL
, (1024));
132 /* calculate maxSfbPerGroup */
134 for (wnd
= 0; wnd
< TRANS_FAC
; wnd
++)
136 for (sfb
= sfbActive
-1; sfb
>= highestSfb
; sfb
--)
138 for (line
= sfbOffset
[sfb
+1]-1; line
>= sfbOffset
[sfb
]; line
--)
140 if ( mdctSpectrum
[wnd
*granuleLength_short
+line
] != FL2FXCONST_SPC(0.0) ) break; /* this band is not completely zero */
142 if (line
>= sfbOffset
[sfb
]) break; /* this band was not completely zero */
144 highestSfb
= fixMax(highestSfb
, sfb
);
146 highestSfb
= highestSfb
> 0 ? highestSfb
: 0;
147 *maxSfbPerGroup
= highestSfb
+1;
149 /* calculate groupedSfbOffset */
152 for (grp
= 0; grp
< noOfGroups
; grp
++)
154 for (sfb
= 0; sfb
< sfbActive
+1; sfb
++)
156 groupedSfbOffset
[i
++] = offset
+ sfbOffset
[sfb
] * groupLen
[grp
];
159 offset
+= groupLen
[grp
] * granuleLength_short
;
161 groupedSfbOffset
[i
++] = granuleLength
;
163 /* calculate groupedSfbMinSnr */
165 for (grp
= 0; grp
< noOfGroups
; grp
++)
167 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
169 groupedSfbMinSnrLdData
[i
++] = sfbMinSnrLdData
[sfb
];
174 /* sum up sfbThresholds */
177 for (grp
= 0; grp
< noOfGroups
; grp
++)
179 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
181 FIXP_DBL thresh
= sfbThreshold
->Short
[wnd
][sfb
];
182 for (j
=1; j
<groupLen
[grp
]; j
++)
184 thresh
= nrgAddSaturate(thresh
, sfbThreshold
->Short
[wnd
+j
][sfb
]);
186 sfbThreshold
->Long
[i
++] = thresh
;
189 wnd
+= groupLen
[grp
];
192 /* sum up sfbEnergies left/right */
195 for (grp
= 0; grp
< noOfGroups
; grp
++)
197 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
199 FIXP_DBL energy
= sfbEnergy
->Short
[wnd
][sfb
];
200 for (j
=1; j
<groupLen
[grp
]; j
++)
202 energy
= nrgAddSaturate(energy
, sfbEnergy
->Short
[wnd
+j
][sfb
]);
204 sfbEnergy
->Long
[i
++] = energy
;
207 wnd
+= groupLen
[grp
];
210 /* sum up sfbEnergies mid/side */
213 for (grp
= 0; grp
< noOfGroups
; grp
++)
215 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
217 FIXP_DBL energy
= sfbEnergyMS
->Short
[wnd
][sfb
];
218 for (j
=1; j
<groupLen
[grp
]; j
++)
220 energy
= nrgAddSaturate(energy
, sfbEnergyMS
->Short
[wnd
+j
][sfb
]);
222 sfbEnergyMS
->Long
[i
++] = energy
;
225 wnd
+= groupLen
[grp
];
228 /* sum up sfbSpreadEnergies */
231 for (grp
= 0; grp
< noOfGroups
; grp
++)
233 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
235 FIXP_DBL energy
= sfbSpreadEnergy
->Short
[wnd
][sfb
];
236 for (j
=1; j
<groupLen
[grp
]; j
++)
238 energy
= nrgAddSaturate(energy
, sfbSpreadEnergy
->Short
[wnd
+j
][sfb
]);
240 sfbSpreadEnergy
->Long
[i
++] = energy
;
243 wnd
+= groupLen
[grp
];
246 /* re-group spectrum */
249 for (grp
= 0; grp
< noOfGroups
; grp
++)
251 for (sfb
= 0; sfb
< sfbActive
; sfb
++)
253 int width
= sfbOffset
[sfb
+1]-sfbOffset
[sfb
];
254 FIXP_DBL
*pMdctSpectrum
= &mdctSpectrum
[sfbOffset
[sfb
]] + wnd
*granuleLength_short
;
255 for (j
= 0; j
< groupLen
[grp
]; j
++)
257 FIXP_DBL
*pTmp
= pMdctSpectrum
;
258 for (line
= width
; line
> 0; line
--)
260 tmpSpectrum
[i
++] = *pTmp
++;
262 pMdctSpectrum
+= granuleLength_short
;
265 i
+= (groupLen
[grp
]*(sfbOffset
[sfbCnt
]-sfbOffset
[sfb
]));
266 wnd
+= groupLen
[grp
];
269 FDKmemcpy(mdctSpectrum
, tmpSpectrum
, granuleLength
*sizeof(FIXP_DBL
));
271 C_ALLOC_SCRATCH_END(tmpSpectrum
, FIXP_DBL
, (1024))