mirror of https://github.com/mstorsjo/fdk-aac.git
258 lines
8.7 KiB
C++
258 lines
8.7 KiB
C++
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. 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
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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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
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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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,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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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
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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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
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized 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
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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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,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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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
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this software, even if 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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/**************************** SBR encoder library ******************************
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Author(s):
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Description:
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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, USHORT crcMask, USHORT *crc,
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ULONG bValue, INT bBits) {
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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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/**
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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(
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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, 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, memorySize, 0,
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BS_WRITER);
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if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
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if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { /* 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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/**
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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 FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData,
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HANDLE_FDK_CRCINFO hCrcInfo, INT crcRegion,
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UINT sbrSyntaxFlags) {
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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) 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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* 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,
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SI_SBR_DRM_CRC_BITS);
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} else {
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if (!(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY)) {
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/* Do alignment here, because its defined as part of the
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* 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)
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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 +
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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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