| /* ----------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------- */ |
| |
| /*********************** MPEG surround decoder library ************************* |
| |
| Author(s): Christian Ertel, Christian Griebel |
| |
| Description: SAC Dec error concealment |
| |
| *******************************************************************************/ |
| |
| #include "sac_dec_conceal.h" |
| |
| void SpatialDecConcealment_Init(SpatialDecConcealmentInfo *info, |
| const UINT resetFlags) { |
| FDK_ASSERT(info != NULL); |
| |
| if (resetFlags & MPEGS_CONCEAL_RESET_STATE) { |
| info->concealState = SpatialDecConcealState_Init; |
| /* Frame counters will be initialized implicitely in function |
| * SpatialDecConcealment_UpdateState(). */ |
| } |
| |
| if (resetFlags & MPEGS_CONCEAL_RESET_PARAMETER) { |
| /* Set default params */ |
| info->concealParams.method = MPEGS_CONCEAL_DEFAULT_METHOD; |
| info->concealParams.numKeepFrames = MPEGS_CONCEAL_DEFAULT_NUM_KEEP_FRAMES; |
| info->concealParams.numFadeOutFrames = |
| MPEGS_CONCEAL_DEFAULT_FADE_OUT_SLOPE_LENGTH; |
| info->concealParams.numFadeInFrames = |
| MPEGS_CONCEAL_DEFAULT_FADE_IN_SLOPE_LENGTH; |
| info->concealParams.numReleaseFrames = |
| MPEGS_CONCEAL_DEFAULT_NUM_RELEASE_FRAMES; |
| } |
| |
| return; |
| } |
| |
| int SpatialDecConcealment_Apply( |
| SpatialDecConcealmentInfo *info, |
| const SCHAR (*cmpIdxData)[MAX_PARAMETER_BANDS], SCHAR **diffIdxData, |
| SCHAR * |
| idxPrev, /* char |
| idxPrev[SPATIALDEC_MAX_NUM_OTT][SPATIALDEC_MAX_PARAMETER_BANDS], |
| */ |
| SCHAR *bsXXXDataMode, const int startBand, const int stopBand, |
| const SCHAR defaultValue, const int paramType, const int numParamSets) { |
| int appliedProcessing = 0; |
| int band, dataMode = -1; |
| |
| FDK_ASSERT(info != NULL); |
| FDK_ASSERT(cmpIdxData != NULL); |
| FDK_ASSERT(idxPrev != NULL); |
| FDK_ASSERT(bsXXXDataMode != NULL); |
| |
| /* Processing depends only on the internal state */ |
| switch (info->concealState) { |
| case SpatialDecConcealState_Init: |
| dataMode = 0; /* default */ |
| break; |
| |
| case SpatialDecConcealState_Ok: |
| /* Nothing to do */ |
| break; |
| |
| case SpatialDecConcealState_Keep: |
| dataMode = 1; /* keep */ |
| break; |
| |
| case SpatialDecConcealState_FadeToDefault: { |
| /* Start simple fade out */ |
| FIXP_DBL fac = fDivNorm(info->cntStateFrames + 1, |
| info->concealParams.numFadeOutFrames + 1); |
| |
| for (band = startBand; band < stopBand; band += 1) { |
| /* idxPrev = fac * defaultValue + (1-fac) * idxPrev; */ |
| idxPrev[band] = |
| fMultI(fac, defaultValue - idxPrev[band]) + idxPrev[band]; |
| } |
| dataMode = 1; /* keep */ |
| appliedProcessing = 1; |
| } break; |
| |
| case SpatialDecConcealState_Default: |
| for (band = startBand; band < stopBand; band += 1) { |
| idxPrev[band] = defaultValue; |
| } |
| dataMode = 1; /* keep */ |
| appliedProcessing = 1; |
| break; |
| |
| case SpatialDecConcealState_FadeFromDefault: { |
| FIXP_DBL fac = fDivNorm(info->cntValidFrames + 1, |
| info->concealParams.numFadeInFrames + 1); |
| |
| for (band = startBand; band < stopBand; band += 1) { |
| /* idxPrev = fac * cmpIdxData + (1-fac) * defaultValue; */ |
| idxPrev[band] = |
| fMultI(fac, cmpIdxData[numParamSets - 1][band] - defaultValue) + |
| defaultValue; |
| } |
| dataMode = 1; /* keep */ |
| appliedProcessing = 1; |
| } break; |
| |
| default: |
| FDK_ASSERT(0); /* All valid states shall be handled above. */ |
| break; |
| } |
| |
| if (dataMode >= 0) { |
| int i; |
| for (i = 0; i < numParamSets; i += 1) { |
| bsXXXDataMode[i] = dataMode; |
| if (diffIdxData != NULL) { |
| for (band = startBand; band < stopBand; band += 1) { |
| diffIdxData[i][band] = 0; |
| } |
| } |
| } |
| } |
| |
| return appliedProcessing; |
| } |
| |
| void SpatialDecConcealment_UpdateState(SpatialDecConcealmentInfo *info, |
| const int frameOk) { |
| FDK_ASSERT(info != NULL); |
| |
| if (frameOk) { |
| info->cntValidFrames += 1; |
| } else { |
| info->cntValidFrames = 0; |
| } |
| |
| switch (info->concealState) { |
| case SpatialDecConcealState_Init: |
| if (frameOk) { |
| /* NEXT STATE: Ok */ |
| info->concealState = SpatialDecConcealState_Ok; |
| info->cntStateFrames = 0; |
| } |
| break; |
| |
| case SpatialDecConcealState_Ok: |
| if (!frameOk) { |
| /* NEXT STATE: Keep */ |
| info->concealState = SpatialDecConcealState_Keep; |
| info->cntStateFrames = 0; |
| } |
| break; |
| |
| case SpatialDecConcealState_Keep: |
| info->cntStateFrames += 1; |
| if (frameOk) { |
| /* NEXT STATE: Ok */ |
| info->concealState = SpatialDecConcealState_Ok; |
| } else { |
| if (info->cntStateFrames >= info->concealParams.numKeepFrames) { |
| if (info->concealParams.numFadeOutFrames == 0) { |
| /* NEXT STATE: Default */ |
| info->concealState = SpatialDecConcealState_Default; |
| } else { |
| /* NEXT STATE: Fade to default */ |
| info->concealState = SpatialDecConcealState_FadeToDefault; |
| info->cntStateFrames = 0; |
| } |
| } |
| } |
| break; |
| |
| case SpatialDecConcealState_FadeToDefault: |
| info->cntStateFrames += 1; |
| if (info->cntValidFrames > 0) { |
| /* NEXT STATE: Fade in from default */ |
| info->concealState = SpatialDecConcealState_FadeFromDefault; |
| info->cntStateFrames = 0; |
| } else { |
| if (info->cntStateFrames >= info->concealParams.numFadeOutFrames) { |
| /* NEXT STATE: Default */ |
| info->concealState = SpatialDecConcealState_Default; |
| } |
| } |
| break; |
| |
| case SpatialDecConcealState_Default: |
| if (info->cntValidFrames > 0) { |
| if (info->concealParams.numFadeInFrames == 0) { |
| /* NEXT STATE: Ok */ |
| info->concealState = SpatialDecConcealState_Ok; |
| } else { |
| /* NEXT STATE: Fade in from default */ |
| info->concealState = SpatialDecConcealState_FadeFromDefault; |
| info->cntValidFrames = 0; |
| } |
| } |
| break; |
| |
| case SpatialDecConcealState_FadeFromDefault: |
| info->cntValidFrames += 1; |
| if (frameOk) { |
| if (info->cntValidFrames >= info->concealParams.numFadeInFrames) { |
| /* NEXT STATE: Ok */ |
| info->concealState = SpatialDecConcealState_Ok; |
| } |
| } else { |
| /* NEXT STATE: Fade to default */ |
| info->concealState = SpatialDecConcealState_FadeToDefault; |
| info->cntStateFrames = 0; |
| } |
| break; |
| |
| default: |
| FDK_ASSERT(0); /* All valid states should be handled above! */ |
| break; |
| } |
| } |
| |
| SACDEC_ERROR SpatialDecConcealment_SetParam(SpatialDecConcealmentInfo *self, |
| const SAC_DEC_CONCEAL_PARAM param, |
| const INT value) { |
| SACDEC_ERROR err = MPS_OK; |
| |
| switch (param) { |
| case SAC_DEC_CONCEAL_METHOD: |
| switch ((SpatialDecConcealmentMethod)value) { |
| case SAC_DEC_CONCEAL_WITH_ZERO_VALUED_OUTPUT: |
| case SAC_DEC_CONCEAL_BY_FADING_PARAMETERS: |
| break; |
| default: |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| if (self != NULL) { |
| /* store parameter value */ |
| self->concealParams.method = (SpatialDecConcealmentMethod)value; |
| } else { |
| err = MPS_INVALID_HANDLE; |
| goto bail; |
| } |
| break; |
| case SAC_DEC_CONCEAL_NUM_KEEP_FRAMES: |
| if (value < 0) { |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| if (self != NULL) { |
| /* store parameter value */ |
| self->concealParams.numKeepFrames = (UINT)value; |
| } else { |
| err = MPS_INVALID_HANDLE; |
| goto bail; |
| } |
| break; |
| case SAC_DEC_CONCEAL_FADE_OUT_SLOPE_LENGTH: |
| if (value < 0) { |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| if (self != NULL) { |
| /* store parameter value */ |
| self->concealParams.numFadeOutFrames = (UINT)value; |
| } else { |
| err = MPS_INVALID_HANDLE; |
| goto bail; |
| } |
| break; |
| case SAC_DEC_CONCEAL_FADE_IN_SLOPE_LENGTH: |
| if (value < 0) { |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| if (self != NULL) { |
| /* store parameter value */ |
| self->concealParams.numFadeInFrames = (UINT)value; |
| } else { |
| err = MPS_INVALID_HANDLE; |
| goto bail; |
| } |
| break; |
| case SAC_DEC_CONCEAL_NUM_RELEASE_FRAMES: |
| if (value < 0) { |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| if (self != NULL) { |
| /* store parameter value */ |
| self->concealParams.numReleaseFrames = (UINT)value; |
| } else { |
| err = MPS_INVALID_HANDLE; |
| goto bail; |
| } |
| break; |
| default: |
| err = MPS_INVALID_PARAMETER; |
| goto bail; |
| } |
| |
| bail: |
| return err; |
| } |
