/* ----------------------------------------------------------------------------- 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; }