diff options
Diffstat (limited to 'libSACdec/src/sac_dec_conceal.cpp')
| -rw-r--r-- | libSACdec/src/sac_dec_conceal.cpp | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/libSACdec/src/sac_dec_conceal.cpp b/libSACdec/src/sac_dec_conceal.cpp new file mode 100644 index 0000000..dfeef7b --- /dev/null +++ b/libSACdec/src/sac_dec_conceal.cpp @@ -0,0 +1,392 @@ +/* ----------------------------------------------------------------------------- +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; +} |