/* ------------------------------------------------------------------ * 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_create_limiter_bands.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_create_limiter_bands.h" #include "shellsort.h" #include "s_patch.h" #include "pv_log2.h" #include "fxp_mul32.h" #define R_SHIFT 29 #define Q_fmt(x) (Int32)(x*((Int32)1<=0?0.5F:-0.5F)) /*---------------------------------------------------------------------------- ; 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 ----------------------------------------------------------------------------*/ void sbr_create_limiter_bands(Int32 limSbc[][13], Int32 *gateMode, Int *freqTable, struct PATCH Patch, const Int32 noBands) { Int32 i; Int32 j; Int32 k; Int isPatchBorder[2]; Int32 patchBorders[MAX_NUM_PATCHES + 1]; Int32 workLimiterBandTable[32 + MAX_NUM_PATCHES + 1]; Int32 nOctaves; const Int32 limiterBandsPerOctave[4] = {Q_fmt(0.0F), Q_fmt(1.2F), Q_fmt(2.0F), Q_fmt(3.0F) }; Int32 tmp_q1; Int32 noPatches = Patch.noOfPatches; Int32 lowSubband = freqTable[0]; Int32 highSubband = freqTable[noBands]; for (i = 0; i < noPatches; i++) { patchBorders[i] = Patch.targetStartBand[i] - lowSubband; } patchBorders[i] = highSubband - lowSubband; /* First band: 1 limiter band. */ limSbc[0][0] = freqTable[0] - lowSubband; limSbc[0][1] = freqTable[noBands] - lowSubband; gateMode[0] = 1; /* Next three bands: 1.2, 2, 3 limiter bands/octave plus bandborders at patchborders. */ for (i = 1; i < 4; i++) { for (k = 0; k <= noBands; k++) { workLimiterBandTable[k] = freqTable[k] - lowSubband; } for (k = 1; k < noPatches; k++) { workLimiterBandTable[noBands+k] = patchBorders[k]; } gateMode[i] = noBands + noPatches - 1; shellsort(workLimiterBandTable, gateMode[i] + 1); for (j = 1; j <= gateMode[i]; j++) { tmp_q1 = ((workLimiterBandTable[j] + lowSubband) << 20) / (workLimiterBandTable[j-1] + lowSubband); nOctaves = pv_log2(tmp_q1); tmp_q1 = fxp_mul32_Q20(nOctaves, limiterBandsPerOctave[i]); if (tmp_q1 < Q_fmt(0.49)) { if (workLimiterBandTable[j] == workLimiterBandTable[j-1]) { workLimiterBandTable[j] = highSubband; shellsort(workLimiterBandTable, gateMode[i] + 1); gateMode[i]--; j--; continue; } isPatchBorder[0] = isPatchBorder[1] = 0; for (k = 0; k <= noPatches; k++) { if (workLimiterBandTable[j-1] == patchBorders[k]) { isPatchBorder[0] = 1; break; } } for (k = 0; k <= noPatches; k++) { if (workLimiterBandTable[j] == patchBorders[k]) { isPatchBorder[1] = 1; break; } } if (!isPatchBorder[1]) { workLimiterBandTable[j] = highSubband; shellsort(workLimiterBandTable, gateMode[i] + 1); gateMode[i]--; j--; } else if (!isPatchBorder[0]) { workLimiterBandTable[j-1] = highSubband; shellsort(workLimiterBandTable, gateMode[i] + 1); gateMode[i]--; j--; } } } for (k = 0; k <= gateMode[i]; k++) { limSbc[i][k] = workLimiterBandTable[k]; } } } #endif