| /* ------------------------------------------------------------------ |
| * 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 |
| |
