diff options
Diffstat (limited to 'media/libstagefright/codecs/aacdec/ps_bstr_decoding.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/ps_bstr_decoding.cpp | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/ps_bstr_decoding.cpp b/media/libstagefright/codecs/aacdec/ps_bstr_decoding.cpp new file mode 100644 index 0000000..c7ed60b --- /dev/null +++ b/media/libstagefright/codecs/aacdec/ps_bstr_decoding.cpp @@ -0,0 +1,304 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either + * express or implied. + * See the License for the specific language governing permissions + * and limitations under the License. + * ------------------------------------------------------------------- + */ +/* + + Filename: ps_bstr_decoding.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Decodes parametric stereo + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +SC 29 Software Copyright Licencing Disclaimer: + +This software module was originally developed by + Coding Technologies + +and edited by + - + +in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 +standards for reference purposes and its performance may not have been +optimized. This software module is an implementation of one or more tools as +specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. +ISO/IEC gives users free license to this software module or modifications +thereof for use in products claiming conformance to audiovisual and +image-coding related ITU Recommendations and/or ISO/IEC International +Standards. ISO/IEC gives users the same free license to this software module or +modifications thereof for research purposes and further ISO/IEC standardisation. +Those intending to use this software module in products are advised that its +use may infringe existing patents. ISO/IEC have no liability for use of this +software module or modifications thereof. Copyright is not released for +products that do not conform to audiovisual and image-coding related ITU +Recommendations and/or ISO/IEC International Standards. +The original developer retains full right to modify and use the code for its +own purpose, assign or donate the code to a third party and to inhibit third +parties from using the code for products that do not conform to audiovisual and +image-coding related ITU Recommendations and/or ISO/IEC International Standards. +This copyright notice must be included in all copies or derivative works. +Copyright (c) ISO/IEC 2003. + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#ifdef AAC_PLUS + +#ifdef PARAMETRICSTEREO + +#include "pv_audio_type_defs.h" +#include "aac_mem_funcs.h" +#include "ps_bstr_decoding.h" +#include "ps_decode_bs_utils.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +const Int32 aNoIidBins[3] = {NO_LOW_RES_IID_BINS, NO_IID_BINS, NO_HI_RES_BINS}; +const Int32 aNoIccBins[3] = {NO_LOW_RES_ICC_BINS, NO_ICC_BINS, NO_HI_RES_BINS}; +const Int32 aFixNoEnvDecode[4] = {0, 1, 2, 4}; + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + +void ps_bstr_decoding(STRUCT_PS_DEC *ps_dec) +{ + UInt32 env; + Int32 noIidSteps; + + if (!ps_dec->bPsDataAvail) + { + ps_dec->noEnv = 0; + } + + noIidSteps = ps_dec->bFineIidQ ? NO_IID_STEPS_FINE : NO_IID_STEPS; + + for (env = 0; env < ps_dec->noEnv; env++) + { + Int32 *aPrevIidIndex; + Int32 *aPrevIccIndex; + if (env == 0) + { + aPrevIidIndex = ps_dec->aIidPrevFrameIndex; + aPrevIccIndex = ps_dec->aIccPrevFrameIndex; + } + else + { + aPrevIidIndex = ps_dec->aaIidIndex[env-1]; + aPrevIccIndex = ps_dec->aaIccIndex[env-1]; + } + + /* + * Differential Decoding of IID parameters over time/frequency + */ + differential_Decoding(ps_dec->bEnableIid, + ps_dec->aaIidIndex[env], + aPrevIidIndex, + ps_dec->abIidDtFlag[env], + aNoIidBins[ps_dec->freqResIid], + (ps_dec->freqResIid) ? 1 : 2, + -noIidSteps, + noIidSteps); + + /* + * Differential Decoding of ICC parameters over time/frequency + */ + differential_Decoding(ps_dec->bEnableIcc, + ps_dec->aaIccIndex[env], + aPrevIccIndex, + ps_dec->abIccDtFlag[env], + aNoIccBins[ps_dec->freqResIcc], + (ps_dec->freqResIcc) ? 1 : 2, + 0, + NO_ICC_STEPS - 1); + + + } /* for (env=0; env<ps_dec->noEnv; env++) */ + + if (ps_dec->noEnv == 0) + { + ps_dec->noEnv = 1; + + if (ps_dec->bEnableIid) + { /* NO_HI_RES_BINS == 34 */ + pv_memmove(ps_dec->aaIidIndex[ps_dec->noEnv-1], + ps_dec->aIidPrevFrameIndex, + NO_HI_RES_BINS*sizeof(*ps_dec->aIidPrevFrameIndex)); + + } + else + { + pv_memset((void *)ps_dec->aaIidIndex[ps_dec->noEnv-1], + 0, + NO_HI_RES_BINS*sizeof(**ps_dec->aaIidIndex)); + } + if (ps_dec->bEnableIcc) + { + pv_memmove(ps_dec->aaIccIndex[ps_dec->noEnv-1], + ps_dec->aIccPrevFrameIndex, + NO_HI_RES_BINS*sizeof(*ps_dec->aIccPrevFrameIndex)); + } + else + { + pv_memset((void *)ps_dec->aaIccIndex[ps_dec->noEnv-1], + 0, + NO_HI_RES_BINS*sizeof(**ps_dec->aaIccIndex)); + } + } + + pv_memmove(ps_dec->aIidPrevFrameIndex, + ps_dec->aaIidIndex[ps_dec->noEnv-1], + NO_HI_RES_BINS*sizeof(*ps_dec->aIidPrevFrameIndex)); + + pv_memmove(ps_dec->aIccPrevFrameIndex, + ps_dec->aaIccIndex[ps_dec->noEnv-1], + NO_HI_RES_BINS*sizeof(*ps_dec->aIccPrevFrameIndex)); + + ps_dec->bPsDataAvail = 0; + + if (ps_dec->bFrameClass == 0) + { + Int32 shift; + + shift = ps_dec->noEnv >> 1; + + ps_dec->aEnvStartStop[0] = 0; + + for (env = 1; env < ps_dec->noEnv; env++) + { + ps_dec->aEnvStartStop[env] = + (env * ps_dec->noSubSamples) >> shift; + } + + ps_dec->aEnvStartStop[ps_dec->noEnv] = ps_dec->noSubSamples; + } + else + { /* if (ps_dec->bFrameClass != 0) */ + ps_dec->aEnvStartStop[0] = 0; + + if (ps_dec->aEnvStartStop[ps_dec->noEnv] < ps_dec->noSubSamples) + { + ps_dec->noEnv++; + ps_dec->aEnvStartStop[ps_dec->noEnv] = ps_dec->noSubSamples; + + pv_memmove(ps_dec->aaIidIndex[ps_dec->noEnv], + ps_dec->aaIidIndex[ps_dec->noEnv-1], + NO_HI_RES_BINS*sizeof(**ps_dec->aaIidIndex)); + + pv_memmove(ps_dec->aaIccIndex[ps_dec->noEnv], + ps_dec->aaIccIndex[ps_dec->noEnv-1], + NO_HI_RES_BINS*sizeof(**ps_dec->aaIccIndex)); + } + + for (env = 1; env < ps_dec->noEnv; env++) + { + UInt32 thr; + thr = ps_dec->noSubSamples - ps_dec->noEnv + env; + + if (ps_dec->aEnvStartStop[env] > thr) + { + ps_dec->aEnvStartStop[env] = thr; + } + else + { + thr = ps_dec->aEnvStartStop[env-1] + 1; + + if (ps_dec->aEnvStartStop[env] < thr) + { + ps_dec->aEnvStartStop[env] = thr; + } + } + } + } /* if (ps_dec->bFrameClass == 0) ... else */ + + for (env = 0; env < ps_dec->noEnv; env++) + { + if (ps_dec->freqResIid == 2) + { + map34IndexTo20(ps_dec->aaIidIndex[env]); + } + if (ps_dec->freqResIcc == 2) + { + map34IndexTo20(ps_dec->aaIccIndex[env]); + } + } + + +} + +#endif + + +#endif + |