1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2013 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 Sbr decoder 87 */ 88 #ifndef __PSDEC_H 89 #define __PSDEC_H 90 91 #include "sbrdecoder.h" 92 93 94 95 /* This PS decoder implements the baseline version. So it always uses the */ 96 /* hybrid filter structure for 20 stereo bands and does not implemet IPD/OPD */ 97 /* synthesis. The baseline version has to support the complete PS bitstream */ 98 /* syntax. But IPD/OPD data is ignored and set to 0. If 34 stereo band config */ 99 /* is used in the bitstream for IIS/ICC the decoded parameters are mapped to */ 100 /* 20 stereo bands. */ 101 102 103 #include "FDK_bitstream.h" 104 105 #include "psdec_hybrid.h" 106 107 #define SCAL_HEADROOM ( 2 ) 108 109 #define PS_EXTENSION_SIZE_BITS ( 4 ) 110 #define PS_EXTENSION_ESC_COUNT_BITS ( 8 ) 111 112 #define NO_QMF_CHANNELS ( 64 ) 113 #define MAX_NUM_COL ( 32 ) 114 115 116 #define NO_QMF_BANDS_HYBRID20 ( 3 ) 117 #define NO_SUB_QMF_CHANNELS ( 12 ) 118 119 #define NRG_INT_COEFF ( 0.75f ) 120 #define INT_FILTER_COEFF (FL2FXCONST_DBL( 1.0f - NRG_INT_COEFF )) 121 #define PEAK_DECAY_FACTOR (FL2FXCONST_DBL( 0.765928338364649f )) 122 #define TRANSIENT_IMPACT_FACTOR (FL2FXCONST_DBL( 2.0 / 3.0 )) 123 124 #define NO_SERIAL_ALLPASS_LINKS ( 3 ) 125 #define MAX_NO_PS_ENV ( 4 + 1 ) /* +1 needed for VAR_BORDER */ 126 127 #define MAX_DELAY_BUFFER_SIZE ( 14 ) 128 #define NO_DELAY_BUFFER_BANDS ( 35 ) 129 130 #define NO_HI_RES_BINS ( 34 ) 131 #define NO_MID_RES_BINS ( 20 ) 132 #define NO_LOW_RES_BINS ( 10 ) 133 134 #define FIRST_DELAY_SB ( 23 ) 135 #define NO_SAMPLE_DELAY_ALLPASS ( 2 ) 136 #define NO_DELAY_LENGTH_VECTORS ( 12 ) /* d(m): d(0)=3 + d(1)=4 + d(2)=5 */ 137 138 #define NO_HI_RES_IID_BINS ( NO_HI_RES_BINS ) 139 #define NO_HI_RES_ICC_BINS ( NO_HI_RES_BINS ) 140 141 #define NO_MID_RES_IID_BINS ( NO_MID_RES_BINS ) 142 #define NO_MID_RES_ICC_BINS ( NO_MID_RES_BINS ) 143 144 #define NO_LOW_RES_IID_BINS ( NO_LOW_RES_BINS ) 145 #define NO_LOW_RES_ICC_BINS ( NO_LOW_RES_BINS ) 146 147 #define SUBQMF_GROUPS ( 10 ) 148 #define QMF_GROUPS ( 12 ) 149 150 #define SUBQMF_GROUPS_HI_RES ( 32 ) 151 #define QMF_GROUPS_HI_RES ( 18 ) 152 153 #define NO_IID_GROUPS ( SUBQMF_GROUPS + QMF_GROUPS ) 154 #define NO_IID_GROUPS_HI_RES ( SUBQMF_GROUPS_HI_RES + QMF_GROUPS_HI_RES ) 155 156 #define NO_IID_STEPS ( 7 ) /* 1 .. + 7 */ 157 #define NO_IID_STEPS_FINE ( 15 ) /* 1 .. +15 */ 158 #define NO_ICC_STEPS ( 8 ) /* 0 .. + 7 */ 159 160 #define NO_IID_LEVELS ( 2 * NO_IID_STEPS + 1 ) /* - 7 .. + 7 */ 161 #define NO_IID_LEVELS_FINE ( 2 * NO_IID_STEPS_FINE + 1 ) /* -15 .. +15 */ 162 #define NO_ICC_LEVELS ( NO_ICC_STEPS ) /* 0 .. + 7 */ 163 164 #define FIXP_SQRT05 ((FIXP_DBL)0x5a827980) /* 1/SQRT2 */ 165 166 struct PS_DEC_COEFFICIENTS { 167 168 FIXP_DBL H11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 169 FIXP_DBL H12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 170 FIXP_DBL H21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 171 FIXP_DBL H22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 172 173 FIXP_DBL DeltaH11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 174 FIXP_DBL DeltaH12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 175 FIXP_DBL DeltaH21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 176 FIXP_DBL DeltaH22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ 177 178 SCHAR aaIidIndexMapped[MAX_NO_PS_ENV][NO_HI_RES_IID_BINS]; /*!< The mapped IID index for all envelopes and all IID bins */ 179 SCHAR aaIccIndexMapped[MAX_NO_PS_ENV][NO_HI_RES_ICC_BINS]; /*!< The mapped ICC index for all envelopes and all ICC bins */ 180 181 }; 182 183 184 185 186 typedef enum { 187 ppt_none = 0, 188 ppt_mpeg = 1, 189 ppt_drm = 2 190 } PS_PAYLOAD_TYPE; 191 192 193 typedef struct { 194 UCHAR bPsHeaderValid; /*!< set if new header is available from bitstream */ 195 196 UCHAR bEnableIid; /*!< One bit denoting the presence of IID parameters */ 197 UCHAR bEnableIcc; /*!< One bit denoting the presence of ICC parameters */ 198 UCHAR bEnableExt; /*!< The PS extension layer is enabled using the enable_ext bit. 199 If it is set to %1 the IPD and OPD parameters are sent. 200 If it is disabled, i.e. %0, the extension layer is skipped. */ 201 202 UCHAR modeIid; /*!< The configuration of IID parameters (number of bands and 203 quantisation grid, iid_quant) is determined by iid_mode. */ 204 UCHAR modeIcc; /*!< The configuration of Inter-channel Coherence parameters 205 (number of bands and quantisation grid) is determined by 206 icc_mode. */ 207 208 UCHAR freqResIid; /*!< 0=low, 1=mid or 2=high frequency resolution for iid */ 209 UCHAR freqResIcc; /*!< 0=low, 1=mid or 2=high frequency resolution for icc */ 210 211 UCHAR bFineIidQ; /*!< Use fine Iid quantisation. */ 212 213 UCHAR bFrameClass; /*!< The frame_class bit determines whether the parameter 214 positions of the current frame are uniformly spaced 215 accross the frame or they are defined using the positions 216 described by border_position. */ 217 218 UCHAR noEnv; /*!< The number of envelopes per frame */ 219 UCHAR aEnvStartStop[MAX_NO_PS_ENV+1]; /*!< In case of variable parameter spacing the parameter 220 positions are determined by border_position */ 221 222 SCHAR abIidDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for IID, 0 => freq */ 223 SCHAR abIccDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for ICC, 0 => freq */ 224 225 SCHAR aaIidIndex[MAX_NO_PS_ENV][NO_HI_RES_IID_BINS]; /*!< The IID index for all envelopes and all IID bins */ 226 SCHAR aaIccIndex[MAX_NO_PS_ENV][NO_HI_RES_ICC_BINS]; /*!< The ICC index for all envelopes and all ICC bins */ 227 228 } MPEG_PS_BS_DATA; 229 230 231 232 struct PS_DEC { 233 234 SCHAR noSubSamples; 235 SCHAR noChannels; 236 237 SCHAR procFrameBased; /*!< Helper to detected switching from frame based to slot based 238 processing */ 239 240 PS_PAYLOAD_TYPE bPsDataAvail[(1)+1]; /*!< set if new data available from bitstream */ 241 UCHAR psDecodedPrv; /*!< set if PS has been processed in the last frame */ 242 243 /* helpers for frame delay line */ 244 UCHAR bsLastSlot; /*!< Index of last read slot. */ 245 UCHAR bsReadSlot; /*!< Index of current read slot for additional delay. */ 246 UCHAR processSlot; /*!< Index of current slot for processing (need for add. delay). */ 247 248 249 INT rescal; 250 INT sf_IntBuffer; 251 252 union { /* Bitstream data */ 253 MPEG_PS_BS_DATA mpeg; /*!< Struct containing all MPEG specific PS data from bitstream. */ 254 } bsData[(1)+1]; 255 256 shouldBeUnion { /* Static data */ 257 struct { 258 SCHAR aIidPrevFrameIndex[NO_HI_RES_IID_BINS]; /*!< The IID index for previous frame */ 259 SCHAR aIccPrevFrameIndex[NO_HI_RES_ICC_BINS]; /*!< The ICC index for previous frame */ 260 261 UCHAR delayBufIndex; /*!< Pointer to where the latest sample is in buffer */ 262 UCHAR noSampleDelay; /*!< How many QMF samples delay is used. */ 263 UCHAR lastUsb; /*!< uppermost WMF delay band of last frame */ 264 265 UCHAR aDelayRBufIndexSer[NO_SERIAL_ALLPASS_LINKS]; /*!< Delay buffer for reverb filter */ 266 UCHAR aDelayBufIndexDelayQmf[NO_QMF_CHANNELS-FIRST_DELAY_SB]; /*!< Delay buffer for ICC group 20 & 21 */ 267 268 SCHAR scaleFactorPsDelayBuffer; /*!< Scale factor for ps delay buffer */ 269 270 /* hybrid filter bank delay lines */ 271 FIXP_DBL aaQmfDelayBufReal[(NO_QMF_CHANNELS-FIRST_DELAY_SB) + (MAX_DELAY_BUFFER_SIZE-1)*(NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)]; 272 FIXP_DBL aaQmfDelayBufImag[(NO_QMF_CHANNELS-FIRST_DELAY_SB) + (MAX_DELAY_BUFFER_SIZE-1)*(NO_DELAY_BUFFER_BANDS-FIRST_DELAY_SB)]; 273 274 FIXP_DBL *pAaRealDelayBufferQmf[MAX_DELAY_BUFFER_SIZE]; /*!< Real part delay buffer */ 275 FIXP_DBL *pAaImagDelayBufferQmf[MAX_DELAY_BUFFER_SIZE]; /*!< Imaginary part delay buffer */ 276 277 FIXP_DBL aaRealDelayBufferQmf[NO_SAMPLE_DELAY_ALLPASS][FIRST_DELAY_SB]; /*!< Real part delay buffer */ 278 FIXP_DBL aaImagDelayBufferQmf[NO_SAMPLE_DELAY_ALLPASS][FIRST_DELAY_SB]; /*!< Imaginary part delay buffer*/ 279 280 FIXP_DBL aaRealDelayBufferSubQmf[NO_SAMPLE_DELAY_ALLPASS][NO_SUB_QMF_CHANNELS]; /*!< Real part delay buffer */ 281 FIXP_DBL aaImagDelayBufferSubQmf[NO_SAMPLE_DELAY_ALLPASS][NO_SUB_QMF_CHANNELS]; /*!< Imaginary part delay buffer */ 282 283 FIXP_DBL aaaRealDelayRBufferSerQmf[FIRST_DELAY_SB][NO_DELAY_LENGTH_VECTORS]; /*!< Real part delay buffer */ 284 FIXP_DBL aaaImagDelayRBufferSerQmf[FIRST_DELAY_SB][NO_DELAY_LENGTH_VECTORS]; /*!< Imaginary part delay buffer */ 285 286 FIXP_DBL aaaRealDelayRBufferSerSubQmf[NO_SUB_QMF_CHANNELS][NO_DELAY_LENGTH_VECTORS]; /*!< Real part delay buffer */ 287 FIXP_DBL aaaImagDelayRBufferSerSubQmf[NO_SUB_QMF_CHANNELS][NO_DELAY_LENGTH_VECTORS]; /*!< Imaginary part delay buffer */ 288 289 HYBRID hybrid; /*!< hybrid filter bank struct 1 or 2. */ 290 291 FIXP_DBL aPrevNrgBin[NO_MID_RES_BINS]; /*!< energy of previous frame */ 292 FIXP_DBL aPrevPeakDiffBin[NO_MID_RES_BINS]; /*!< peak difference of previous frame */ 293 FIXP_DBL aPeakDecayFastBin[NO_MID_RES_BINS]; /*!< Saved max. peak decay value per bin */ 294 SCHAR aPowerPrevScal[NO_MID_RES_BINS]; /*!< Last power value (each bin) of previous frame */ 295 296 FIXP_DBL h11rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) coefficients */ 297 FIXP_DBL h12rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) coefficients */ 298 FIXP_DBL h21rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) coefficients */ 299 FIXP_DBL h22rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) coefficients */ 300 301 PS_DEC_COEFFICIENTS coef; /*!< temporal coefficients (reusable scratch memory) */ 302 303 } mpeg; 304 305 } specificTo; 306 307 308 }; 309 310 typedef struct PS_DEC *HANDLE_PS_DEC; 311 312 313 int CreatePsDec(HANDLE_PS_DEC *h_PS_DEC, int aacSamplesPerFrame); 314 315 int DeletePsDec(HANDLE_PS_DEC *h_PS_DEC); 316 317 void 318 scalFilterBankValues( HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */ 319 FIXP_DBL **fixpQmfReal, /* qmf filterbank values */ 320 FIXP_DBL **fixpQmfImag, /* qmf filterbank values */ 321 int lsb, /* sbr start subband */ 322 int scaleFactorLowBandSplitLow, 323 int scaleFactorLowBandSplitHigh, 324 SCHAR *scaleFactorLowBand_lb, 325 SCHAR *scaleFactorLowBand_hb, 326 int scaleFactorHighBands, 327 INT *scaleFactorHighBand, 328 INT noCols); 329 330 void 331 rescalFilterBankValues( HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */ 332 FIXP_DBL **QmfBufferReal, /* qmf filterbank values */ 333 FIXP_DBL **QmfBufferImag, /* qmf filterbank values */ 334 int lsb, /* sbr start subband */ 335 INT noCols); 336 337 338 void 339 initSlotBasedRotation( HANDLE_PS_DEC h_ps_d, 340 int env, 341 int usb); 342 343 void 344 ApplyPsSlot( HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */ 345 FIXP_DBL **rIntBufferLeft, /* real values of left qmf timeslot */ 346 FIXP_DBL **iIntBufferLeft, /* imag values of left qmf timeslot */ 347 FIXP_DBL *rIntBufferRight, /* real values of right qmf timeslot */ 348 FIXP_DBL *iIntBufferRight); /* imag values of right qmf timeslot */ 349 350 351 352 #endif /* __PSDEC_H */ 353
