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Diffstat (limited to 'media/libstagefright/codecs/aacdec/sbr_find_start_andstop_band.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/sbr_find_start_andstop_band.cpp | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/sbr_find_start_andstop_band.cpp b/media/libstagefright/codecs/aacdec/sbr_find_start_andstop_band.cpp new file mode 100644 index 0000000..fc3d38f --- /dev/null +++ b/media/libstagefright/codecs/aacdec/sbr_find_start_andstop_band.cpp @@ -0,0 +1,198 @@ +/* ------------------------------------------------------------------ + * 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 + + + |