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1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2018 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 encoder library ******************************
96 
97    Author(s):
98 
99    Description:
100 
101 *******************************************************************************/
102 
103 /*!
104   \file
105   \brief  Envelope estimation structs and prototypes $Revision: 92790 $
106 */
107 #ifndef ENV_EST_H
108 #define ENV_EST_H
109 
110 #include "sbr_def.h"
111 #include "sbr_encoder.h" /* SBR econfig structs */
112 #include "ps_main.h"
113 #include "bit_sbr.h"
114 #include "fram_gen.h"
115 #include "tran_det.h"
116 #include "code_env.h"
117 #include "ton_corr.h"
118 
119 typedef struct {
120   FIXP_DBL *rBuffer[32];
121   FIXP_DBL *iBuffer[32];
122 
123   FIXP_DBL *p_YBuffer;
124 
125   FIXP_DBL *YBuffer[32];
126   int YBufferScale[2];
127 
128   UCHAR envelopeCompensation[MAX_FREQ_COEFFS];
129   UCHAR pre_transient_info[2];
130 
131   int YBufferWriteOffset;
132   int YBufferSzShift;
133   int rBufferReadOffset;
134 
135   int no_cols;
136   int no_rows;
137   int start_index;
138 
139   int time_slots;
140   int time_step;
141 } SBR_EXTRACT_ENVELOPE;
142 typedef SBR_EXTRACT_ENVELOPE *HANDLE_SBR_EXTRACT_ENVELOPE;
143 
144 struct ENV_CHANNEL {
145   FAST_TRAN_DETECTOR sbrFastTransientDetector;
146   SBR_TRANSIENT_DETECTOR sbrTransientDetector;
147   SBR_CODE_ENVELOPE sbrCodeEnvelope;
148   SBR_CODE_ENVELOPE sbrCodeNoiseFloor;
149   SBR_EXTRACT_ENVELOPE sbrExtractEnvelope;
150 
151   SBR_ENVELOPE_FRAME SbrEnvFrame;
152   SBR_TON_CORR_EST TonCorr;
153 
154   struct SBR_ENV_DATA encEnvData;
155 
156   int qmfScale;
157   UCHAR fLevelProtect;
158 };
159 typedef struct ENV_CHANNEL *HANDLE_ENV_CHANNEL;
160 
161 /************  Function Declarations ***************/
162 
163 INT FDKsbrEnc_CreateExtractSbrEnvelope(HANDLE_SBR_EXTRACT_ENVELOPE hSbrCut,
164                                        INT channel, INT chInEl,
165                                        UCHAR *dynamic_RAM);
166 
167 INT FDKsbrEnc_InitExtractSbrEnvelope(HANDLE_SBR_EXTRACT_ENVELOPE hSbr,
168                                      int no_cols, int no_rows, int start_index,
169                                      int time_slots, int time_step,
170                                      int tran_off, ULONG statesInitFlag,
171                                      int chInEl, UCHAR *dynamic_RAM,
172                                      UINT sbrSyntaxFlags);
173 
174 void FDKsbrEnc_deleteExtractSbrEnvelope(HANDLE_SBR_EXTRACT_ENVELOPE hSbrCut);
175 
176 typedef struct {
177   FREQ_RES res[MAX_NUM_NOISE_VALUES];
178   int maxQuantError;
179 
180 } SBR_FRAME_TEMP_DATA;
181 
182 typedef struct {
183   const SBR_FRAME_INFO *frame_info;
184   FIXP_DBL noiseFloor[MAX_NUM_NOISE_VALUES];
185   SCHAR sfb_nrg_coupling
186       [MAX_NUM_ENVELOPE_VALUES]; /* only used if stereomode = SWITCH_L_R_C */
187   SCHAR sfb_nrg[MAX_NUM_ENVELOPE_VALUES];
188   SCHAR noise_level_coupling
189       [MAX_NUM_NOISE_VALUES]; /* only used if stereomode = SWITCH_L_R_C */
190   SCHAR noise_level[MAX_NUM_NOISE_VALUES];
191   UCHAR transient_info[3];
192   UCHAR nEnvelopes;
193 } SBR_ENV_TEMP_DATA;
194 
195 /*
196  * Extract features from QMF data. Afterwards, the QMF data is not required
197  * anymore.
198  */
199 void FDKsbrEnc_extractSbrEnvelope1(HANDLE_SBR_CONFIG_DATA h_con,
200                                    HANDLE_SBR_HEADER_DATA sbrHeaderData,
201                                    HANDLE_SBR_BITSTREAM_DATA sbrBitstreamData,
202                                    HANDLE_ENV_CHANNEL h_envChan,
203                                    HANDLE_COMMON_DATA cmonData,
204                                    SBR_ENV_TEMP_DATA *eData,
205                                    SBR_FRAME_TEMP_DATA *fData);
206 
207 /*
208  * Process the previously features extracted by FDKsbrEnc_extractSbrEnvelope1
209  * and create/encode SBR envelopes.
210  */
211 void FDKsbrEnc_extractSbrEnvelope2(HANDLE_SBR_CONFIG_DATA h_con,
212                                    HANDLE_SBR_HEADER_DATA sbrHeaderData,
213                                    HANDLE_PARAMETRIC_STEREO hParametricStereo,
214                                    HANDLE_SBR_BITSTREAM_DATA sbrBitstreamData,
215                                    HANDLE_ENV_CHANNEL sbrEnvChannel0,
216                                    HANDLE_ENV_CHANNEL sbrEnvChannel1,
217                                    HANDLE_COMMON_DATA cmonData,
218                                    SBR_ENV_TEMP_DATA *eData,
219                                    SBR_FRAME_TEMP_DATA *fData, int clearOutput);
220 
221 INT FDKsbrEnc_GetEnvEstDelay(HANDLE_SBR_EXTRACT_ENVELOPE hSbr);
222 
223 #endif
224