| /* ------------------------------------------------------------------ |
| * 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: sbr_decode_envelope.c |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Who: Date: MM/DD/YYYY |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| 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 2002. |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #ifdef AAC_PLUS |
| |
| |
| #include "sbr_decode_envelope.h" |
| #include "sbr_constants.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 |
| ----------------------------------------------------------------------------*/ |
| void mapLowResEnergyVal( |
| Int32 currVal, |
| Int32 *prevData, |
| Int32 offset, |
| Int32 index, |
| Int32 res); |
| |
| Int32 indexLow2High(Int32 offset, |
| Int32 index, |
| Int32 res); |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 sbr_decode_envelope(SBR_FRAME_DATA * hFrameData) |
| |
| { |
| Int32 i; |
| Int32 no_of_bands; |
| Int32 band; |
| Int32 freqRes; |
| Int32 *iEnvelope = hFrameData->iEnvelope_man; |
| Int32 *sfb_nrg_prev = hFrameData->sfb_nrg_prev_man; |
| |
| Int32 offset = hFrameData->offset; |
| Int32 *nSfb = hFrameData->nSfb; |
| Int32 *domain_vec = hFrameData->domain_vec1; |
| Int32 *frameInfo = hFrameData->frameInfo; |
| |
| |
| |
| for (i = 0; i < frameInfo[0]; i++) |
| { |
| freqRes = frameInfo[frameInfo[0] + i + 2]; |
| no_of_bands = nSfb[freqRes]; |
| |
| if (domain_vec[i] == 0) |
| { |
| mapLowResEnergyVal(*iEnvelope, |
| sfb_nrg_prev, |
| offset, |
| 0, |
| freqRes); |
| iEnvelope++; |
| |
| for (band = 1; band < no_of_bands; band++) |
| { |
| *iEnvelope += *(iEnvelope - 1); |
| |
| mapLowResEnergyVal(*iEnvelope, |
| sfb_nrg_prev, |
| offset, |
| band, |
| freqRes); |
| iEnvelope++; |
| } |
| } |
| else |
| { |
| for (band = 0; band < no_of_bands; band++) |
| { |
| *iEnvelope += sfb_nrg_prev[ indexLow2High(offset, band, freqRes)]; |
| |
| mapLowResEnergyVal(*iEnvelope, |
| sfb_nrg_prev, |
| offset, |
| band, |
| freqRes); |
| iEnvelope++; |
| } |
| } |
| } |
| } |
| |
| |
| |
| void mapLowResEnergyVal( |
| Int32 currVal, |
| Int32 *prevData, |
| Int32 offset, |
| Int32 index, |
| Int32 res) |
| { |
| Int32 tmp; |
| |
| if (res == LO) |
| { |
| if (offset >= 0) |
| { |
| if (index < offset) |
| { |
| prevData[index] = currVal; |
| } |
| else |
| { |
| tmp = (index << 1) - offset; |
| prevData[tmp ] = currVal; |
| prevData[tmp +1 ] = currVal; |
| } |
| } |
| else |
| { |
| offset = -offset; |
| if (index < offset) |
| { |
| tmp = (index << 1) + index; |
| prevData[tmp ] = currVal; |
| prevData[tmp + 1] = currVal; |
| prevData[tmp + 2] = currVal; |
| } |
| else |
| { |
| tmp = (index << 1) + offset; |
| prevData[tmp ] = currVal; |
| prevData[tmp + 1] = currVal; |
| } |
| } |
| } |
| else |
| { |
| prevData[index] = currVal; |
| } |
| } |
| |
| |
| Int32 indexLow2High(Int32 offset, |
| Int32 index, |
| Int32 res) |
| { |
| if (res == LO) |
| { |
| if (offset >= 0) |
| { |
| if (index < offset) |
| { |
| return(index); |
| } |
| else |
| { |
| return((index << 1) - offset); |
| } |
| } |
| else |
| { |
| offset = -offset; |
| if (index < offset) |
| { |
| return((index << 1) + index); |
| } |
| else |
| { |
| return((index << 1) + offset); |
| } |
| } |
| } |
| else |
| { |
| return(index); |
| } |
| } |
| |
| #endif |
| |
