/* ------------------------------------------------------------------ * 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: get_sbr_stopfreq.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 if(fs < 32000) { k1_min = (Int) ( ( (float) (6000 * 2 * 64) / fs ) + 0.5 ); } else { if (fs < 64000) { k1_min = (Int) ( ( (float) (8000 * 2 * 64) / fs ) + 0.5 ); } else { k1_min = (Int) ( ((float) (10000 * 2 * 64) / fs ) + 0.5); } } return((Int)( k1_min * pow( 64.0 / k1_min,(stop_freq)/13.0) + 0.5)); ------------------------------------------------------------------------------ */ /*---------------------------------------------------------------------------- ; INCLUDES ----------------------------------------------------------------------------*/ #ifdef AAC_PLUS #include "get_sbr_stopfreq.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 ----------------------------------------------------------------------------*/ const UChar sbr_stopfreq_tbl[6][13] = { { 21, 23, 25, 27, 29, 32, 35, 38, 41, 45, 49, 54, 59}, /* 48000 */ { 23, 25, 27, 29, 31, 34, 37, 40, 43, 47, 51, 55, 59}, /* 44100 */ { 32, 34, 36, 38, 40, 42, 44, 46, 49, 52, 55, 58, 61}, /* 32000 and 24000 */ { 35, 36, 38, 40, 42, 44, 46, 48, 50, 52, 55, 58, 61}, /* 22050 */ { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 62} /* 16000 */ }; Int get_sbr_stopfreq(const Int32 fs, const Int32 stop_freq) { Int i; switch (fs) { case 48000: i = 0; break; case 32000: case 24000: i = 2; break; case 22050: i = 3; break; case 16000: i = 4; break; case 44100: default: i = 1; break; } return((Int)sbr_stopfreq_tbl[i][stop_freq]); } #endif