1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2015 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 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. 12 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. 17 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. 24 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. 28 29 2. COPYRIGHT LICENSE 30 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: 33 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. 36 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. 41 42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43 prior written permission. 44 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. 47 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." 52 53 3. NO PATENT LICENSE 54 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. 58 59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60 by appropriate patent licenses. 61 62 4. DISCLAIMER 63 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. 72 73 5. CONTACT INFORMATION 74 75 Fraunhofer Institute for Integrated Circuits IIS 76 Attention: Audio and Multimedia Departments - FDK AAC LL 77 Am Wolfsmantel 33 78 91058 Erlangen, Germany 79 80 www.iis.fraunhofer.de/amm 81 amm-info (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 /*! 85 \file 86 \brief Framing generator prototypes and structs 87 */ 88 #ifndef _FRAM_GEN_H 89 #define _FRAM_GEN_H 90 91 #include "sbr_def.h" /* for MAX_ENVELOPES and MAX_NOISE_ENVELOPES in struct FRAME_INFO and CODEC_TYPE */ 92 #include "sbr_encoder.h" /* for FREQ_RES */ 93 94 #define MAX_ENVELOPES_VARVAR MAX_ENVELOPES /*!< worst case number of envelopes in a VARVAR frame */ 95 #define MAX_ENVELOPES_FIXVAR_VARFIX 4 /*!< worst case number of envelopes in VARFIX and FIXVAR frames */ 96 #define MAX_NUM_REL 3 /*!< maximum number of relative borders in any VAR frame */ 97 98 /* SBR frame class definitions */ 99 typedef enum { 100 FIXFIX = 0, /*!< bs_frame_class: leading and trailing frame borders are fixed */ 101 FIXVAR, /*!< bs_frame_class: leading frame border is fixed, trailing frame border is variable */ 102 VARFIX, /*!< bs_frame_class: leading frame border is variable, trailing frame border is fixed */ 103 VARVAR /*!< bs_frame_class: leading and trailing frame borders are variable */ 104 ,FIXFIXonly /*!< bs_frame_class: leading border fixed (0), trailing border fixed (nrTimeSlots) and encased borders are dynamically derived from the tranPos */ 105 }FRAME_CLASS; 106 107 108 /* helper constants */ 109 #define DC 4711 /*!< helper constant: don't care */ 110 #define EMPTY (-99) /*!< helper constant: empty */ 111 112 113 /* system constants: AAC+SBR, DRM Frame-Length */ 114 #define FRAME_MIDDLE_SLOT_1920 4 115 #define NUMBER_TIME_SLOTS_1920 15 116 117 #define LD_PRETRAN_OFF 3 118 #define FRAME_MIDDLE_SLOT_512LD 4 119 #define NUMBER_TIME_SLOTS_512LD 8 120 #define TRANSIENT_OFFSET_LD 0 121 122 123 124 /* 125 system constants: AAC+SBR or aacPRO (hybrid format), Standard Frame-Length, Multi-Rate 126 --------------------------------------------------------------------------- 127 Number of slots (numberTimeSlots): 16 (NUMBER_TIME_SLOTS_2048) 128 Detector-offset (frameMiddleSlot): 4 129 Overlap : 3 130 Buffer-offset : 8 (BUFFER_FRAME_START_2048 = 0) 131 132 133 |<------------tranPos---------->| 134 |c|d|e|f|0|1|2|3|4|5|6|7|8|9|a|b|c|d|e|f| 135 FixFix | | 136 FixVar | :<- ->: 137 VarFix :<- ->: | 138 VarVar :<- ->: :<- ->: 139 0 1 2 3 4 5 6 7 8 9 a b c d e f 0 1 2 3 140 ................................................................................ 141 142 |-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-| 143 144 frame-generator:0 16 24 32 145 analysis-buffer:8 24 32 40 146 */ 147 #define FRAME_MIDDLE_SLOT_2048 4 148 #define NUMBER_TIME_SLOTS_2048 16 149 150 151 /* 152 system constants: mp3PRO, Multi-Rate & Single-Rate 153 -------------------------------------------------- 154 Number of slots (numberTimeSlots): 9 (NUMBER_TIME_SLOTS_1152) 155 Detector-offset (frameMiddleSlot): 4 (FRAME_MIDDLE_SLOT_1152) 156 Overlap : 3 157 Buffer-offset : 4.5 (BUFFER_FRAME_START_1152 = 0) 158 159 160 |<----tranPos---->| 161 |5|6|7|8|0|1|2|3|4|5|6|7|8| 162 FixFix | | 163 FixVar | :<- ->: 164 VarFix :<- ->: | 165 VarVar :<- ->: :<- ->: 166 0 1 2 3 4 5 6 7 8 0 1 2 3 167 ............................................. 168 169 -|-|-|-|-B-|-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-| 170 171 frame-generator: 0 9 13 18 172 analysis-buffer: 4.5 13.5 22.5 173 */ 174 #define FRAME_MIDDLE_SLOT_1152 4 175 #define NUMBER_TIME_SLOTS_1152 9 176 177 178 /* system constants: Layer2+SBR */ 179 #define FRAME_MIDDLE_SLOT_2304 8 180 #define NUMBER_TIME_SLOTS_2304 18 181 182 183 /*! 184 \struct SBR_GRID 185 \brief sbr_grid() signals to be converted to bitstream elements 186 187 The variables hold the signals (e.g. lengths and numbers) in "clear text" 188 */ 189 190 typedef struct 191 { 192 /* system constants */ 193 INT bufferFrameStart; /*!< frame generator vs analysis buffer time alignment (currently set to 0, offset added elsewhere) */ 194 INT numberTimeSlots; /*!< number of SBR timeslots per frame */ 195 196 /* will be adjusted for every frame */ 197 FRAME_CLASS frameClass; /*!< SBR frame class */ 198 INT bs_num_env; /*!< bs_num_env, number of envelopes for FIXFIX */ 199 INT bs_abs_bord; /*!< bs_abs_bord, absolute border for VARFIX and FIXVAR */ 200 INT n; /*!< number of relative borders for VARFIX and FIXVAR */ 201 INT p; /*!< pointer-to-transient-border */ 202 INT bs_rel_bord[MAX_NUM_REL]; /*!< bs_rel_bord, relative borders for all VAR */ 203 INT v_f[MAX_ENVELOPES_FIXVAR_VARFIX]; /*!< envelope frequency resolutions for FIXVAR and VARFIX */ 204 205 INT bs_abs_bord_0; /*!< bs_abs_bord_0, leading absolute border for VARVAR */ 206 INT bs_abs_bord_1; /*!< bs_abs_bord_1, trailing absolute border for VARVAR */ 207 INT bs_num_rel_0; /*!< bs_num_rel_0, number of relative borders associated with leading absolute border for VARVAR */ 208 INT bs_num_rel_1; /*!< bs_num_rel_1, number of relative borders associated with trailing absolute border for VARVAR */ 209 INT bs_rel_bord_0[MAX_NUM_REL]; /*!< bs_rel_bord_0, relative borders associated with leading absolute border for VARVAR */ 210 INT bs_rel_bord_1[MAX_NUM_REL]; /*!< bs_rel_bord_1, relative borders associated with trailing absolute border for VARVAR */ 211 INT v_fLR[MAX_ENVELOPES_VARVAR]; /*!< envelope frequency resolutions for VARVAR */ 212 213 } 214 SBR_GRID; 215 typedef SBR_GRID *HANDLE_SBR_GRID; 216 217 218 219 /*! 220 \struct SBR_FRAME_INFO 221 \brief time/frequency grid description for one frame 222 */ 223 typedef struct 224 { 225 INT nEnvelopes; /*!< number of envelopes */ 226 INT borders[MAX_ENVELOPES+1]; /*!< envelope borders in SBR timeslots */ 227 FREQ_RES freqRes[MAX_ENVELOPES]; /*!< frequency resolution of each envelope */ 228 INT shortEnv; /*!< number of an envelope to be shortened (starting at 1) or 0 for no shortened envelope */ 229 INT nNoiseEnvelopes; /*!< number of noise floors */ 230 INT bordersNoise[MAX_NOISE_ENVELOPES+1];/*!< noise floor borders in SBR timeslots */ 231 } 232 SBR_FRAME_INFO; 233 /* WARNING: When rearranging the elements of this struct keep in mind that the static 234 * initializations in the corresponding C-file have to be rearranged as well! 235 * snd 2002/01/23 236 */ 237 typedef SBR_FRAME_INFO *HANDLE_SBR_FRAME_INFO; 238 239 240 /*! 241 \struct SBR_ENVELOPE_FRAME 242 \brief frame generator main struct 243 244 Contains tuning parameters, time/frequency grid description, sbr_grid() bitstream elements, and generator internal signals 245 */ 246 typedef struct 247 { 248 /* system constants */ 249 INT frameMiddleSlot; /*!< transient detector offset in SBR timeslots */ 250 251 /* basic tuning parameters */ 252 INT staticFraming; /*!< 1: run static framing in time, i.e. exclusive use of bs_frame_class = FIXFIX */ 253 INT numEnvStatic; /*!< number of envelopes per frame for static framing */ 254 FREQ_RES freq_res_fixfix[2]; /*!< envelope frequency resolution to use for bs_frame_class = FIXFIX; single env and split */ 255 UCHAR fResTransIsLow; /*!< frequency resolution for transient frames - always low (0) or according to table (1) */ 256 257 /* expert tuning parameters */ 258 const int *v_tuningSegm; /*!< segment lengths to use around transient */ 259 const int *v_tuningFreq; /*!< frequency resolutions to use around transient */ 260 INT dmin; /*!< minimum length of dependent segments */ 261 INT dmax; /*!< maximum length of dependent segments */ 262 INT allowSpread; /*!< 1: allow isolated transient to influence grid of 3 consecutive frames */ 263 264 /* internally used signals */ 265 FRAME_CLASS frameClassOld; /*!< frame class used for previous frame */ 266 INT spreadFlag; /*!< 1: use VARVAR instead of VARFIX to follow up old transient */ 267 268 INT v_bord[2 * MAX_ENVELOPES_VARVAR + 1]; /*!< borders for current frame and preliminary borders for next frame (fixed borders excluded) */ 269 INT length_v_bord; /*!< helper variable: length of v_bord */ 270 INT v_freq[2 * MAX_ENVELOPES_VARVAR + 1]; /*!< frequency resolutions for current frame and preliminary resolutions for next frame */ 271 INT length_v_freq; /*!< helper variable: length of v_freq */ 272 273 INT v_bordFollow[MAX_ENVELOPES_VARVAR]; /*!< preliminary borders for current frame (calculated during previous frame) */ 274 INT length_v_bordFollow; /*!< helper variable: length of v_bordFollow */ 275 INT i_tranFollow; /*!< points to transient border in v_bordFollow (may be negative, see keepForFollowUp()) */ 276 INT i_fillFollow; /*!< points to first fill border in v_bordFollow */ 277 INT v_freqFollow[MAX_ENVELOPES_VARVAR]; /*!< preliminary frequency resolutions for current frame (calculated during previous frame) */ 278 INT length_v_freqFollow; /*!< helper variable: length of v_freqFollow */ 279 280 281 /* externally needed signals */ 282 SBR_GRID SbrGrid; /*!< sbr_grid() signals to be converted to bitstream elements */ 283 SBR_FRAME_INFO SbrFrameInfo; /*!< time/frequency grid description for one frame */ 284 } 285 SBR_ENVELOPE_FRAME; 286 typedef SBR_ENVELOPE_FRAME *HANDLE_SBR_ENVELOPE_FRAME; 287 288 289 290 void 291 FDKsbrEnc_initFrameInfoGenerator ( 292 HANDLE_SBR_ENVELOPE_FRAME hSbrEnvFrame, 293 INT allowSpread, 294 INT numEnvStatic, 295 INT staticFraming, 296 INT timeSlots, 297 const FREQ_RES* freq_res_fixfix 298 ,UCHAR fResTransIsLow, 299 INT ldGrid 300 ); 301 302 HANDLE_SBR_FRAME_INFO 303 FDKsbrEnc_frameInfoGenerator (HANDLE_SBR_ENVELOPE_FRAME hSbrEnvFrame, 304 UCHAR *v_transient_info, 305 UCHAR *v_transient_info_pre, 306 int ldGrid, 307 const int *v_tuning); 308 309 #endif 310
