/* ------------------------------------------------------------------ * 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_decode_bs_utils.c Functions: GetNrBitsAvailable differential_Decoding map34IndexTo20 limitMinMax ------------------------------------------------------------------------------ REVISION HISTORY Who: Date: MM/DD/YYYY Description: ------------------------------------------------------------------------------ INPUT AND OUTPUT DEFINITIONS ------------------------------------------------------------------------------ FUNCTION DESCRIPTION Decode bitstream parametric stereo's utilities ------------------------------------------------------------------------------ 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 "aac_mem_funcs.h" #include "s_ps_dec.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 ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; 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 ----------------------------------------------------------------------------*/ Int32 GetNrBitsAvailable(HANDLE_BIT_BUFFER hBitBuf) { return (hBitBuf->bufferLen - hBitBuf->nrBitsRead); } /*---------------------------------------------------------------------------- ; FUNCTION CODE ; ; Differential Decoding of parameters over time/frequency ----------------------------------------------------------------------------*/ void differential_Decoding(Int32 enable, Int32 *aIndex, Int32 *aPrevFrameIndex, Int32 DtDf, Int32 nrElements, Int32 stride, Int32 minIdx, Int32 maxIdx) { Int32 i; Int32 *ptr_aIndex; if (enable == 1) { ptr_aIndex = aIndex; if (DtDf == 0) { *(ptr_aIndex) = limitMinMax(*ptr_aIndex, minIdx, maxIdx); ptr_aIndex++; for (i = 1; i < nrElements; i++) { *(ptr_aIndex) = limitMinMax(aIndex[i-1] + *ptr_aIndex, minIdx, maxIdx); ptr_aIndex++; } } else { if (stride == 1) { for (i = 0; i < nrElements; i++) { *(ptr_aIndex) = limitMinMax(aPrevFrameIndex[i] + *ptr_aIndex, minIdx, maxIdx); ptr_aIndex++; } } else { for (i = 0; i < nrElements; i++) { *(ptr_aIndex) = limitMinMax(aPrevFrameIndex[(i<<1)] + *ptr_aIndex, minIdx, maxIdx); ptr_aIndex++; } } } } else { pv_memset((void *)aIndex, 0, nrElements*sizeof(*aIndex)); } if (stride == 2) { for (i = (nrElements << 1) - 1; i > 0; i--) { aIndex[i] = aIndex[(i>>1)]; } } } /*---------------------------------------------------------------------------- ; FUNCTION CODE map34IndexTo20 ----------------------------------------------------------------------------*/ void map34IndexTo20(Int32 *aIndex) { aIndex[ 0] = ((aIndex[0] << 1) + aIndex[1]) / 3; aIndex[ 1] = (aIndex[1] + (aIndex[2] << 1)) / 3; aIndex[ 2] = ((aIndex[3] << 1) + aIndex[4]) / 3; aIndex[ 3] = (aIndex[4] + (aIndex[5] << 1)) / 3; aIndex[ 4] = (aIndex[ 6] + aIndex[7]) >> 1; aIndex[ 5] = (aIndex[ 8] + aIndex[9]) >> 1; aIndex[ 6] = aIndex[10]; aIndex[ 7] = aIndex[11]; aIndex[ 8] = (aIndex[12] + aIndex[13]) >> 1; aIndex[ 9] = (aIndex[14] + aIndex[15]) >> 1; aIndex[10] = aIndex[16]; aIndex[11] = aIndex[17]; aIndex[12] = aIndex[18]; aIndex[13] = aIndex[19]; aIndex[14] = (aIndex[20] + aIndex[21]) >> 1; aIndex[15] = (aIndex[22] + aIndex[23]) >> 1; aIndex[16] = (aIndex[24] + aIndex[25]) >> 1; aIndex[17] = (aIndex[26] + aIndex[27]) >> 1; aIndex[18] = (aIndex[28] + aIndex[29] + aIndex[30] + aIndex[31]) >> 2; aIndex[19] = (aIndex[32] + aIndex[33]) >> 1; } /*---------------------------------------------------------------------------- ; FUNCTION CODE limitMinMax ----------------------------------------------------------------------------*/ Int32 limitMinMax(Int32 i, Int32 min, Int32 max) { if (i < max) { if (i > min) { return i; } else { return min; } } else { return max; } } #endif #endif