diff options
Diffstat (limited to 'fdk-aac/libSBRenc/src/env_bit.cpp')
| -rw-r--r-- | fdk-aac/libSBRenc/src/env_bit.cpp | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/fdk-aac/libSBRenc/src/env_bit.cpp b/fdk-aac/libSBRenc/src/env_bit.cpp new file mode 100644 index 0000000..41812ac --- /dev/null +++ b/fdk-aac/libSBRenc/src/env_bit.cpp @@ -0,0 +1,257 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +Forschung e.V. All rights reserved. + + 1. INTRODUCTION +The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software +that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding +scheme for digital audio. This FDK AAC Codec software is intended to be used on +a wide variety of Android devices. + +AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient +general perceptual audio codecs. AAC-ELD is considered the best-performing +full-bandwidth communications codec by independent studies and is widely +deployed. AAC has been standardized by ISO and IEC as part of the MPEG +specifications. + +Patent licenses for necessary patent claims for the FDK AAC Codec (including +those of Fraunhofer) may be obtained through Via Licensing +(www.vialicensing.com) or through the respective patent owners individually for +the purpose of encoding or decoding bit streams in products that are compliant +with the ISO/IEC MPEG audio standards. Please note that most manufacturers of +Android devices already license these patent claims through Via Licensing or +directly from the patent owners, and therefore FDK AAC Codec software may +already be covered under those patent licenses when it is used for those +licensed purposes only. + +Commercially-licensed AAC software libraries, including floating-point versions +with enhanced sound quality, are also available from Fraunhofer. Users are +encouraged to check the Fraunhofer website for additional applications +information and documentation. + +2. COPYRIGHT LICENSE + +Redistribution and use in source and binary forms, with or without modification, +are permitted without payment of copyright license fees provided that you +satisfy the following conditions: + +You must retain the complete text of this software license in redistributions of +the FDK AAC Codec or your modifications thereto in source code form. + +You must retain the complete text of this software license in the documentation +and/or other materials provided with redistributions of the FDK AAC Codec or +your modifications thereto in binary form. You must make available free of +charge copies of the complete source code of the FDK AAC Codec and your +modifications thereto to recipients of copies in binary form. + +The name of Fraunhofer may not be used to endorse or promote products derived +from this library without prior written permission. + +You may not charge copyright license fees for anyone to use, copy or distribute +the FDK AAC Codec software or your modifications thereto. + +Your modified versions of the FDK AAC Codec must carry prominent notices stating +that you changed the software and the date of any change. For modified versions +of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" +must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK +AAC Codec Library for Android." + +3. NO PATENT LICENSE + +NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without +limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. +Fraunhofer provides no warranty of patent non-infringement with respect to this +software. + +You may use this FDK AAC Codec software or modifications thereto only for +purposes that are authorized by appropriate patent licenses. + +4. DISCLAIMER + +This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright +holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, +including but not limited to the implied warranties of merchantability and +fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR +CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, +or consequential damages, including but not limited to procurement of substitute +goods or services; loss of use, data, or profits, or business interruption, +however caused and on any theory of liability, whether in contract, strict +liability, or tort (including negligence), arising in any way out of the use of +this software, even if advised of the possibility of such damage. + +5. CONTACT INFORMATION + +Fraunhofer Institute for Integrated Circuits IIS +Attention: Audio and Multimedia Departments - FDK AAC LL +Am Wolfsmantel 33 +91058 Erlangen, Germany + +www.iis.fraunhofer.de/amm +amm-info@iis.fraunhofer.de +----------------------------------------------------------------------------- */ + +/**************************** SBR encoder library ****************************** + + Author(s): + + Description: + +*******************************************************************************/ + +/*! + \file + \brief Remaining SBR Bit Writing Routines +*/ + +#include "env_bit.h" +#include "cmondata.h" + +#ifndef min +#define min(a, b) (a < b ? a : b) +#endif + +#ifndef max +#define max(a, b) (a > b ? a : b) +#endif + +/* ***************************** crcAdvance **********************************/ +/** + * @fn + * @brief updates crc data register + * @return none + * + * This function updates the crc register + * + */ +static void crcAdvance(USHORT crcPoly, USHORT crcMask, USHORT *crc, + ULONG bValue, INT bBits) { + INT i; + USHORT flag; + + for (i = bBits - 1; i >= 0; i--) { + flag = ((*crc) & crcMask) ? (1) : (0); + flag ^= (bValue & (1 << i)) ? (1) : (0); + + (*crc) <<= 1; + if (flag) (*crc) ^= crcPoly; + } +} + +/* ***************************** FDKsbrEnc_InitSbrBitstream + * **********************************/ +/** + * @fn + * @brief Inittialisation of sbr bitstream, write of dummy header and CRC + * @return none + * + * + * + */ + +INT FDKsbrEnc_InitSbrBitstream( + HANDLE_COMMON_DATA hCmonData, + UCHAR *memoryBase, /*!< Pointer to bitstream buffer */ + INT memorySize, /*!< Length of bitstream buffer in bytes */ + HANDLE_FDK_CRCINFO hCrcInfo, UINT sbrSyntaxFlags) /*!< SBR syntax flags */ +{ + INT crcRegion = 0; + + /* reset bit buffer */ + FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER); + + FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase, memorySize, 0, + BS_WRITER); + + if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { + if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { /* Init and start CRC region */ + FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS); + FDKcrcInit(hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS); + crcRegion = FDKcrcStartReg(hCrcInfo, &hCmonData->sbrBitbuf, 0); + } else { + FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS); + } + } + + return (crcRegion); +} + +/* ************************** FDKsbrEnc_AssembleSbrBitstream + * *******************************/ +/** + * @fn + * @brief Formats the SBR payload + * @return nothing + * + * Also the CRC will be calculated here. + * + */ + +void FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData, + HANDLE_FDK_CRCINFO hCrcInfo, INT crcRegion, + UINT sbrSyntaxFlags) { + USHORT crcReg = SBR_CRCINIT; + INT numCrcBits, i; + + /* check if SBR is present */ + if (hCmonData == NULL) return; + + hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */ + + if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { + /* + * Calculate and write DRM CRC + */ + FDKcrcEndReg(hCrcInfo, &hCmonData->sbrBitbuf, crcRegion); + FDKwriteBits(&hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo) ^ 0xFF, + SI_SBR_DRM_CRC_BITS); + } else { + if (!(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY)) { + /* Do alignment here, because its defined as part of the + * sbr_extension_data */ + int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits; + + if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { + sbrLoad += SI_SBR_CRC_BITS; + } + + sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) + page 39. */ + + hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8; + + /* + append fill bits + */ + FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits); + + FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4); + } + + /* + calculate crc + */ + if (sbrSyntaxFlags & SBR_SYNTAX_CRC) { + FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf; + FDKresetBitbuffer(&tmpCRCBuf, BS_READER); + + numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + + hCmonData->sbrFillBits; + + for (i = 0; i < numCrcBits; i++) { + INT bit; + bit = FDKreadBits(&tmpCRCBuf, 1); + crcAdvance(SBR_CRC_POLY, SBR_CRC_MASK, &crcReg, bit, 1); + } + crcReg &= (SBR_CRC_RANGE); + + /* + * Write CRC data. + */ + FDKwriteBits(&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS); + } + } + + FDKsyncCache(&hCmonData->tmpWriteBitbuf); +} |