| /* ----------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten |
| Forschung e.V. All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software |
| that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding |
| scheme for digital audio. This FDK AAC Codec software is intended to be used on |
| a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient |
| general perceptual audio codecs. AAC-ELD is considered the best-performing |
| full-bandwidth communications codec by independent studies and is widely |
| deployed. AAC has been standardized by ISO and IEC as part of the MPEG |
| specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including |
| those of Fraunhofer) may be obtained through Via Licensing |
| (www.vialicensing.com) or through the respective patent owners individually for |
| the purpose of encoding or decoding bit streams in products that are compliant |
| with the ISO/IEC MPEG audio standards. Please note that most manufacturers of |
| Android devices already license these patent claims through Via Licensing or |
| directly from the patent owners, and therefore FDK AAC Codec software may |
| already be covered under those patent licenses when it is used for those |
| licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions |
| with enhanced sound quality, are also available from Fraunhofer. Users are |
| encouraged to check the Fraunhofer website for additional applications |
| information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, |
| are permitted without payment of copyright license fees provided that you |
| satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of |
| the FDK AAC Codec or your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation |
| and/or other materials provided with redistributions of the FDK AAC Codec or |
| your modifications thereto in binary form. You must make available free of |
| charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived |
| from this library without prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute |
| the FDK AAC Codec software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating |
| that you changed the software and the date of any change. For modified versions |
| of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" |
| must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK |
| AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without |
| limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. |
| Fraunhofer provides no warranty of patent non-infringement with respect to this |
| software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for |
| purposes that are authorized by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright |
| holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, |
| including but not limited to the implied warranties of merchantability and |
| fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, |
| or consequential damages, including but not limited to procurement of substitute |
| goods or services; loss of use, data, or profits, or business interruption, |
| however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of |
| this software, even if advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------- */ |
| |
| /**************************** SBR encoder library ****************************** |
| |
| Author(s): |
| |
| Description: |
| |
| *******************************************************************************/ |
| |
| /*! |
| \file |
| \brief Framing generator prototypes and structs $Revision: 92790 $ |
| */ |
| #ifndef FRAM_GEN_H |
| #define FRAM_GEN_H |
| |
| #include "sbr_def.h" /* for MAX_ENVELOPES and MAX_NOISE_ENVELOPES in struct FRAME_INFO and CODEC_TYPE */ |
| #include "sbr_encoder.h" /* for FREQ_RES */ |
| |
| #define MAX_ENVELOPES_VARVAR \ |
| MAX_ENVELOPES /*!< worst case number of envelopes in a VARVAR frame */ |
| #define MAX_ENVELOPES_FIXVAR_VARFIX \ |
| 4 /*!< worst case number of envelopes in VARFIX and FIXVAR frames */ |
| #define MAX_NUM_REL \ |
| 3 /*!< maximum number of relative borders in any VAR frame */ |
| |
| /* SBR frame class definitions */ |
| typedef enum { |
| FIXFIX = |
| 0, /*!< bs_frame_class: leading and trailing frame borders are fixed */ |
| FIXVAR, /*!< bs_frame_class: leading frame border is fixed, trailing frame |
| border is variable */ |
| VARFIX, /*!< bs_frame_class: leading frame border is variable, trailing frame |
| border is fixed */ |
| VARVAR /*!< bs_frame_class: leading and trailing frame borders are variable */ |
| , |
| FIXFIXonly /*!< bs_frame_class: leading border fixed (0), trailing border |
| fixed (nrTimeSlots) and encased borders are dynamically derived |
| from the tranPos */ |
| } FRAME_CLASS; |
| |
| /* helper constants */ |
| #define DC 4711 /*!< helper constant: don't care */ |
| #define EMPTY (-99) /*!< helper constant: empty */ |
| |
| /* system constants: AAC+SBR, DRM Frame-Length */ |
| #define FRAME_MIDDLE_SLOT_1920 4 |
| #define NUMBER_TIME_SLOTS_1920 15 |
| |
| #define LD_PRETRAN_OFF 3 |
| #define FRAME_MIDDLE_SLOT_512LD 4 |
| #define NUMBER_TIME_SLOTS_512LD 8 |
| #define TRANSIENT_OFFSET_LD 0 |
| |
| /* |
| system constants: AAC+SBR or aacPRO (hybrid format), Standard Frame-Length, |
| Multi-Rate |
| --------------------------------------------------------------------------- |
| Number of slots (numberTimeSlots): 16 (NUMBER_TIME_SLOTS_2048) |
| Detector-offset (frameMiddleSlot): 4 |
| Overlap : 3 |
| Buffer-offset : 8 (BUFFER_FRAME_START_2048 = 0) |
| |
| |
| |<------------tranPos---------->| |
| |c|d|e|f|0|1|2|3|4|5|6|7|8|9|a|b|c|d|e|f| |
| FixFix | | |
| FixVar | :<- ->: |
| VarFix :<- ->: | |
| VarVar :<- ->: :<- ->: |
| 0 1 2 3 4 5 6 7 8 9 a b c d e f 0 1 2 3 |
| ................................................................................ |
| |
| |-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-| |
| |
| frame-generator:0 16 24 32 |
| analysis-buffer:8 24 32 40 |
| */ |
| #define FRAME_MIDDLE_SLOT_2048 4 |
| #define NUMBER_TIME_SLOTS_2048 16 |
| |
| /* |
| system constants: mp3PRO, Multi-Rate & Single-Rate |
| -------------------------------------------------- |
| Number of slots (numberTimeSlots): 9 (NUMBER_TIME_SLOTS_1152) |
| Detector-offset (frameMiddleSlot): 4 (FRAME_MIDDLE_SLOT_1152) |
| Overlap : 3 |
| Buffer-offset : 4.5 (BUFFER_FRAME_START_1152 = 0) |
| |
| |
| |<----tranPos---->| |
| |5|6|7|8|0|1|2|3|4|5|6|7|8| |
| FixFix | | |
| FixVar | :<- ->: |
| VarFix :<- ->: | |
| VarVar :<- ->: :<- ->: |
| 0 1 2 3 4 5 6 7 8 0 1 2 3 |
| ............................................. |
| |
| -|-|-|-|-B-|-|-|-|-|-|-|-|-B-|-|-|-|-|-|-|-|-| |
| |
| frame-generator: 0 9 13 18 |
| analysis-buffer: 4.5 13.5 22.5 |
| */ |
| #define FRAME_MIDDLE_SLOT_1152 4 |
| #define NUMBER_TIME_SLOTS_1152 9 |
| |
| /* system constants: Layer2+SBR */ |
| #define FRAME_MIDDLE_SLOT_2304 8 |
| #define NUMBER_TIME_SLOTS_2304 18 |
| |
| /*! |
| \struct SBR_GRID |
| \brief sbr_grid() signals to be converted to bitstream elements |
| |
| The variables hold the signals (e.g. lengths and numbers) in "clear text" |
| */ |
| |
| typedef struct { |
| /* system constants */ |
| INT bufferFrameStart; /*!< frame generator vs analysis buffer time alignment |
| (currently set to 0, offset added elsewhere) */ |
| INT numberTimeSlots; /*!< number of SBR timeslots per frame */ |
| |
| /* will be adjusted for every frame */ |
| FRAME_CLASS frameClass; /*!< SBR frame class */ |
| INT bs_num_env; /*!< bs_num_env, number of envelopes for FIXFIX */ |
| INT bs_abs_bord; /*!< bs_abs_bord, absolute border for VARFIX and FIXVAR */ |
| INT n; /*!< number of relative borders for VARFIX and FIXVAR */ |
| INT p; /*!< pointer-to-transient-border */ |
| INT bs_rel_bord[MAX_NUM_REL]; /*!< bs_rel_bord, relative borders for all VAR |
| */ |
| INT v_f[MAX_ENVELOPES_FIXVAR_VARFIX]; /*!< envelope frequency resolutions for |
| FIXVAR and VARFIX */ |
| |
| INT bs_abs_bord_0; /*!< bs_abs_bord_0, leading absolute border for VARVAR */ |
| INT bs_abs_bord_1; /*!< bs_abs_bord_1, trailing absolute border for VARVAR */ |
| INT bs_num_rel_0; /*!< bs_num_rel_0, number of relative borders associated |
| with leading absolute border for VARVAR */ |
| INT bs_num_rel_1; /*!< bs_num_rel_1, number of relative borders associated |
| with trailing absolute border for VARVAR */ |
| INT bs_rel_bord_0[MAX_NUM_REL]; /*!< bs_rel_bord_0, relative borders |
| associated with leading absolute border |
| for VARVAR */ |
| INT bs_rel_bord_1[MAX_NUM_REL]; /*!< bs_rel_bord_1, relative borders |
| associated with trailing absolute border |
| for VARVAR */ |
| INT v_fLR[MAX_ENVELOPES_VARVAR]; /*!< envelope frequency resolutions for |
| VARVAR */ |
| |
| } SBR_GRID; |
| typedef SBR_GRID *HANDLE_SBR_GRID; |
| |
| /*! |
| \struct SBR_FRAME_INFO |
| \brief time/frequency grid description for one frame |
| */ |
| typedef struct { |
| INT nEnvelopes; /*!< number of envelopes */ |
| INT borders[MAX_ENVELOPES + 1]; /*!< envelope borders in SBR timeslots */ |
| FREQ_RES freqRes[MAX_ENVELOPES]; /*!< frequency resolution of each envelope */ |
| INT shortEnv; /*!< number of an envelope to be shortened (starting at 1) or 0 |
| for no shortened envelope */ |
| INT nNoiseEnvelopes; /*!< number of noise floors */ |
| INT bordersNoise[MAX_NOISE_ENVELOPES + |
| 1]; /*!< noise floor borders in SBR timeslots */ |
| } SBR_FRAME_INFO; |
| /* WARNING: When rearranging the elements of this struct keep in mind that the |
| * static initializations in the corresponding C-file have to be rearranged as |
| * well! snd 2002/01/23 |
| */ |
| typedef SBR_FRAME_INFO *HANDLE_SBR_FRAME_INFO; |
| |
| /*! |
| \struct SBR_ENVELOPE_FRAME |
| \brief frame generator main struct |
| |
| Contains tuning parameters, time/frequency grid description, sbr_grid() |
| bitstream elements, and generator internal signals |
| */ |
| typedef struct { |
| /* system constants */ |
| INT frameMiddleSlot; /*!< transient detector offset in SBR timeslots */ |
| |
| /* basic tuning parameters */ |
| INT staticFraming; /*!< 1: run static framing in time, i.e. exclusive use of |
| bs_frame_class = FIXFIX */ |
| INT numEnvStatic; /*!< number of envelopes per frame for static framing */ |
| FREQ_RES |
| freq_res_fixfix[2]; /*!< envelope frequency resolution to use for |
| bs_frame_class = FIXFIX; single env and split */ |
| UCHAR |
| fResTransIsLow; /*!< frequency resolution for transient frames - always |
| low (0) or according to table (1) */ |
| |
| /* expert tuning parameters */ |
| const int *v_tuningSegm; /*!< segment lengths to use around transient */ |
| const int *v_tuningFreq; /*!< frequency resolutions to use around transient */ |
| INT dmin; /*!< minimum length of dependent segments */ |
| INT dmax; /*!< maximum length of dependent segments */ |
| INT allowSpread; /*!< 1: allow isolated transient to influence grid of 3 |
| consecutive frames */ |
| |
| /* internally used signals */ |
| FRAME_CLASS frameClassOld; /*!< frame class used for previous frame */ |
| INT spreadFlag; /*!< 1: use VARVAR instead of VARFIX to follow up old |
| transient */ |
| |
| INT v_bord[2 * MAX_ENVELOPES_VARVAR + 1]; /*!< borders for current frame and |
| preliminary borders for next |
| frame (fixed borders excluded) */ |
| INT length_v_bord; /*!< helper variable: length of v_bord */ |
| INT v_freq[2 * MAX_ENVELOPES_VARVAR + 1]; /*!< frequency resolutions for |
| current frame and preliminary |
| resolutions for next frame */ |
| INT length_v_freq; /*!< helper variable: length of v_freq */ |
| |
| INT v_bordFollow[MAX_ENVELOPES_VARVAR]; /*!< preliminary borders for current |
| frame (calculated during previous |
| frame) */ |
| INT length_v_bordFollow; /*!< helper variable: length of v_bordFollow */ |
| INT i_tranFollow; /*!< points to transient border in v_bordFollow (may be |
| negative, see keepForFollowUp()) */ |
| INT i_fillFollow; /*!< points to first fill border in v_bordFollow */ |
| INT v_freqFollow[MAX_ENVELOPES_VARVAR]; /*!< preliminary frequency resolutions |
| for current frame (calculated |
| during previous frame) */ |
| INT length_v_freqFollow; /*!< helper variable: length of v_freqFollow */ |
| |
| /* externally needed signals */ |
| SBR_GRID |
| SbrGrid; /*!< sbr_grid() signals to be converted to bitstream elements */ |
| SBR_FRAME_INFO |
| SbrFrameInfo; /*!< time/frequency grid description for one frame */ |
| } SBR_ENVELOPE_FRAME; |
| typedef SBR_ENVELOPE_FRAME *HANDLE_SBR_ENVELOPE_FRAME; |
| |
| void FDKsbrEnc_initFrameInfoGenerator(HANDLE_SBR_ENVELOPE_FRAME hSbrEnvFrame, |
| INT allowSpread, INT numEnvStatic, |
| INT staticFraming, INT timeSlots, |
| const FREQ_RES *freq_res_fixfix, |
| UCHAR fResTransIsLow, INT ldGrid); |
| |
| HANDLE_SBR_FRAME_INFO |
| FDKsbrEnc_frameInfoGenerator(HANDLE_SBR_ENVELOPE_FRAME hSbrEnvFrame, |
| UCHAR *v_transient_info, const INT rightBorderFIX, |
| UCHAR *v_transient_info_pre, int ldGrid, |
| const int *v_tuning); |
| |
| #endif |
