| /* ------------------------------------------------------------------ |
| * 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_find_start_andstop_band.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_find_start_andstop_band.h" |
| #include "get_sbr_startfreq.h" |
| #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 |
| ----------------------------------------------------------------------------*/ |
| |
| SBR_ERROR sbr_find_start_andstop_band(const Int32 samplingFreq, |
| const Int32 startFreq, |
| const Int32 stopFreq, |
| Int *lsbM, |
| Int *usb) |
| { |
| /* Update startFreq struct */ |
| *lsbM = get_sbr_startfreq(samplingFreq, startFreq); |
| |
| if (*lsbM == 0) |
| { |
| return(SBRDEC_ILLEGAL_SCFACTORS); |
| } |
| |
| /*Update stopFreq struct */ |
| if (stopFreq < 13) |
| { |
| *usb = get_sbr_stopfreq(samplingFreq, stopFreq); |
| } |
| else if (stopFreq == 13) |
| { |
| *usb = 64; |
| } |
| else if (stopFreq == 14) |
| { |
| *usb = (*lsbM) << 1; |
| } |
| else |
| { |
| *usb = 3 * *lsbM; |
| } |
| |
| /* limit to Nyqvist */ |
| if (*usb > 64) |
| { |
| *usb = 64; |
| } |
| |
| /* test for invalid lsb, usb combinations */ |
| if ((*usb - *lsbM) > 48) |
| { |
| /* |
| * invalid SBR bitstream ? |
| */ |
| return(SBRDEC_INVALID_BITSTREAM); |
| } |
| |
| if ((samplingFreq == 44100) && ((*usb - *lsbM) > 35)) |
| { |
| /* |
| * invalid SBR bitstream ? |
| */ |
| return(SBRDEC_INVALID_BITSTREAM); |
| } |
| |
| if ((samplingFreq >= 48000) && ((*usb - *lsbM) > 32)) |
| { |
| /* |
| * invalid SBR bitstream ? |
| */ |
| return(SBRDEC_INVALID_BITSTREAM); |
| } |
| |
| return(SBRDEC_OK); |
| |
| } |
| |
| #endif |
| |
| |
| |