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4f0d97057c
- Update disclaimer in all source files. - Increment library version in each FDK sub-module. Bug 9428126 Change-Id: I490b96d4ee472246b01483202b0bb4f1e9c2a5d7
251 lines
8.9 KiB
C++
251 lines
8.9 KiB
C++
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/* -----------------------------------------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
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the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
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audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
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independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
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of the MPEG specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
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individually for the purpose of encoding or decoding bit streams in products that are compliant with
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the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
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these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
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software may already be covered under those patent licenses when it is used for those licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
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applications information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification, are permitted without
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payment of copyright license fees provided that you satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
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your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation and/or other materials
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provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived from this library without
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prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
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software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
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and the date of any change. For modified versions of the FDK AAC Codec, the term
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"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
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"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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respect to this software.
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You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
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"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
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of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
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including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
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or business interruption, however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of this software, even if
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advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------------------------------------- */
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/*!
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\file
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\brief Remaining SBR Bit Writing Routines
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*/
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#include "env_bit.h"
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#include "cmondata.h"
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#ifndef min
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#define min(a,b) ( a < b ? a:b)
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#endif
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#ifndef max
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#define max(a,b) ( a > b ? a:b)
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#endif
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/* ***************************** crcAdvance **********************************/
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/**
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* @fn
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* @brief updates crc data register
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* @return none
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*
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* This function updates the crc register
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*
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*/
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static void crcAdvance(USHORT crcPoly,
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USHORT crcMask,
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USHORT *crc,
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ULONG bValue,
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INT bBits
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)
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{
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INT i;
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USHORT flag;
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for (i=bBits-1; i>=0; i--) {
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flag = ((*crc) & crcMask) ? (1) : (0) ;
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flag ^= (bValue & (1<<i)) ? (1) : (0) ;
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(*crc)<<=1;
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if(flag) (*crc) ^= crcPoly;
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}
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}
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/* ***************************** FDKsbrEnc_InitSbrBitstream **********************************/
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/**
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* @fn
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* @brief Inittialisation of sbr bitstream, write of dummy header and CRC
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* @return none
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*
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*
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*
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*/
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INT FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData,
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UCHAR *memoryBase, /*!< Pointer to bitstream buffer */
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INT memorySize, /*!< Length of bitstream buffer in bytes */
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HANDLE_FDK_CRCINFO hCrcInfo,
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UINT sbrSyntaxFlags) /*!< SBR syntax flags */
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{
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INT crcRegion = 0;
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/* reset bit buffer */
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FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER);
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FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase,
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memorySize, 0, BS_WRITER);
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if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
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if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC)
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{ /* Init and start CRC region */
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FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS);
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FDKcrcInit( hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS );
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crcRegion = FDKcrcStartReg( hCrcInfo, &hCmonData->sbrBitbuf, 0 );
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} else {
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FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS);
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}
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}
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return (crcRegion);
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}
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/* ************************** FDKsbrEnc_AssembleSbrBitstream *******************************/
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/**
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* @fn
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* @brief Formats the SBR payload
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* @return nothing
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*
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* Also the CRC will be calculated here.
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*
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*/
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void
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FDKsbrEnc_AssembleSbrBitstream( HANDLE_COMMON_DATA hCmonData,
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HANDLE_FDK_CRCINFO hCrcInfo,
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INT crcRegion,
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UINT sbrSyntaxFlags)
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{
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USHORT crcReg = SBR_CRCINIT;
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INT numCrcBits,i;
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/* check if SBR is present */
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if ( hCmonData==NULL )
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return;
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hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */
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if ( sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC )
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{
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/*
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* Calculate and write DRM CRC
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*/
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FDKcrcEndReg( hCrcInfo, &hCmonData->sbrBitbuf, crcRegion );
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FDKwriteBits( &hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo)^0xFF, SI_SBR_DRM_CRC_BITS );
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}
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else
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{
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if ( !(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) )
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{
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/* Do alignment here, because its defined as part of the sbr_extension_data */
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int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits;
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if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
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sbrLoad += SI_SBR_CRC_BITS;
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}
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sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) page 39. */
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hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8;
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/*
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append fill bits
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*/
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FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits );
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FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4);
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}
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/*
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calculate crc
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*/
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if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
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FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf;
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FDKresetBitbuffer( &tmpCRCBuf, BS_READER );
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numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + hCmonData->sbrFillBits;
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for(i=0;i<numCrcBits;i++){
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INT bit;
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bit = FDKreadBits(&tmpCRCBuf,1);
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crcAdvance(SBR_CRC_POLY,SBR_CRC_MASK,&crcReg,bit,1);
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}
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crcReg &= (SBR_CRC_RANGE);
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/*
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* Write CRC data.
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*/
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FDKwriteBits (&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS);
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}
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}
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FDKsyncCache(&hCmonData->tmpWriteBitbuf);
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}
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