| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /******************************** MPEG Audio Encoder ************************** |
| |
| Initial author: |
| contents/description: CRC calculation |
| |
| ******************************************************************************/ |
| |
| #include "FDK_crc.h" |
| |
| |
| |
| /*---------------- constants -----------------------*/ |
| |
| /** |
| * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^15 + x^2 + x^0. |
| */ |
| static const USHORT crcLookup_16_15_2_0[256] = |
| { |
| 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011, |
| 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022, |
| 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072, |
| 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041, |
| 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2, |
| 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1, |
| 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1, |
| 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082, |
| 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192, |
| 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1, |
| 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1, |
| 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2, |
| 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151, |
| 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162, |
| 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132, |
| 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101, |
| 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312, |
| 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321, |
| 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371, |
| 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342, |
| 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1, |
| 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2, |
| 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2, |
| 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381, |
| 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291, |
| 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2, |
| 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2, |
| 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1, |
| 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252, |
| 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261, |
| 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231, |
| 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202 |
| }; |
| |
| /** |
| * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^12 + x^5 + x^0. |
| */ |
| static const USHORT crcLookup_16_12_5_0[256] = |
| { |
| 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, |
| 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, |
| 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, |
| 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, |
| 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, |
| 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, |
| 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, |
| 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, |
| 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
| 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, |
| 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, |
| 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, |
| 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, |
| 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, |
| 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, |
| 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, |
| 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, |
| 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
| 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, |
| 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, |
| 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, |
| 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
| 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, |
| 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, |
| 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, |
| 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, |
| 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
| 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, |
| 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, |
| 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, |
| 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, |
| 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 |
| }; |
| |
| |
| /*--------------- function declarations --------------------*/ |
| |
| static inline INT calcCrc_Bits( |
| USHORT * const pCrc, |
| USHORT crcMask, |
| USHORT crcPoly, |
| HANDLE_FDK_BITSTREAM hBs, |
| INT nBits |
| ); |
| |
| static inline INT calcCrc_Bytes( |
| USHORT * const pCrc, |
| const USHORT * pCrcLookup, |
| HANDLE_FDK_BITSTREAM hBs, |
| INT nBytes |
| ); |
| |
| static void crcCalc( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| HANDLE_FDK_BITSTREAM hBs, |
| const INT reg |
| ); |
| |
| |
| /*------------- function definitions ----------------*/ |
| |
| void FDKcrcInit( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const UINT crcPoly, |
| const UINT crcStartValue, |
| const UINT crcLen |
| ) |
| { |
| /* crc polynom example: |
| x^16 + x^15 + x^2 + x^0 (1) 1000 0000 0000 0101 -> 0x8005 |
| x^16 + x^12 + x^5 + x^0 (1) 0001 0000 0010 0001 -> 0x1021 |
| x^8 + x^4 + x^3 + x^2 + x^0 (1) 0001 1101 -> 0x001d */ |
| |
| hCrcInfo->crcLen = crcLen; |
| hCrcInfo->crcPoly = crcPoly; |
| hCrcInfo->startValue = crcStartValue; |
| hCrcInfo->crcMask = (crcLen) ? (1<<(crcLen-1)) : 0; |
| |
| FDKcrcReset(hCrcInfo); |
| |
| hCrcInfo->pCrcLookup = 0; |
| |
| if (hCrcInfo->crcLen==16) { |
| switch ( crcPoly ) { |
| case 0x8005: |
| hCrcInfo->pCrcLookup = crcLookup_16_15_2_0; |
| break; |
| case 0x1021: |
| hCrcInfo->pCrcLookup = crcLookup_16_12_5_0; |
| break; |
| case 0x001d: |
| default: |
| /* no lookup table */ |
| hCrcInfo->pCrcLookup = 0; |
| } |
| } |
| |
| |
| } |
| |
| void FDKcrcReset(HANDLE_FDK_CRCINFO hCrcInfo) |
| { |
| int i; |
| |
| hCrcInfo->crcValue = hCrcInfo->startValue; |
| |
| for(i=0;i<MAX_CRC_REGS;i++) { |
| hCrcInfo->crcRegData[i].isActive = 0; |
| } |
| hCrcInfo->regStart = 0; |
| hCrcInfo->regStop = 0; |
| } |
| |
| INT FDKcrcStartReg( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const HANDLE_FDK_BITSTREAM hBs, |
| const INT mBits |
| ) |
| { |
| int reg = hCrcInfo->regStart; |
| |
| FDK_ASSERT(hCrcInfo->crcRegData[reg].isActive==0); |
| hCrcInfo->crcRegData[reg].isActive = 1; |
| hCrcInfo->crcRegData[reg].maxBits = mBits; |
| hCrcInfo->crcRegData[reg].validBits = FDKgetValidBits(hBs) ; |
| hCrcInfo->crcRegData[reg].bitBufCntBits = 0; |
| |
| hCrcInfo->regStart = (hCrcInfo->regStart+1)%MAX_CRC_REGS; |
| |
| return (reg); |
| } |
| |
| INT FDKcrcEndReg( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| const HANDLE_FDK_BITSTREAM hBs, |
| const INT reg |
| ) |
| { |
| FDK_ASSERT((reg==(INT)hCrcInfo->regStop)&&(hCrcInfo->crcRegData[reg].isActive==1)); |
| |
| if (hBs->ConfigCache==BS_WRITER) { |
| hCrcInfo->crcRegData[reg].bitBufCntBits = FDKgetValidBits(hBs) - hCrcInfo->crcRegData[reg].validBits; |
| } |
| else { |
| hCrcInfo->crcRegData[reg].bitBufCntBits = hCrcInfo->crcRegData[reg].validBits - FDKgetValidBits(hBs); |
| } |
| |
| if (hCrcInfo->crcRegData[reg].maxBits == 0) { |
| hCrcInfo->crcRegData[reg].maxBits = hCrcInfo->crcRegData[reg].bitBufCntBits; |
| } |
| |
| crcCalc( hCrcInfo, hBs, reg); |
| |
| hCrcInfo->crcRegData[reg].isActive = 0; |
| hCrcInfo->regStop = (hCrcInfo->regStop+1)%MAX_CRC_REGS; |
| |
| return 0; |
| } |
| |
| USHORT FDKcrcGetCRC( |
| const HANDLE_FDK_CRCINFO hCrcInfo |
| ) |
| { |
| return ( hCrcInfo->crcValue & (((hCrcInfo->crcMask-1)<<1)+1) ); |
| } |
| |
| /** |
| * \brief Calculate crc bits. |
| * |
| * Calculate crc starting at current bitstream postion over nBits. |
| * |
| * \param pCrc Pointer to an outlying allocated crc info structure. |
| * \param crcMask CrcMask in use. |
| * \param crcPoly Crc polynom in use. |
| * \param hBs Handle to current bit buffer structure. |
| * \param nBits Number of processing bits. |
| * |
| * \return Number of processed bits. |
| */ |
| static inline INT calcCrc_Bits( |
| USHORT * const pCrc, |
| USHORT crcMask, |
| USHORT crcPoly, |
| HANDLE_FDK_BITSTREAM hBs, |
| INT nBits |
| ) |
| { |
| int i; |
| USHORT crc = *pCrc; /* get crc value */ |
| |
| if (hBs!=NULL) { |
| for (i = 0; (i < nBits); i++) { |
| USHORT tmp = FDKreadBits(hBs,1); // process single bit |
| tmp ^= ( (crc & crcMask) ? 1 : 0 ); |
| tmp *= crcPoly; |
| crc <<= 1; |
| crc ^= tmp; |
| } |
| } |
| else { |
| for (i = 0; (i < nBits); i++) { |
| USHORT tmp = 0; // process single bit |
| tmp ^= ( (crc & crcMask) ? 1 : 0 ); |
| tmp *= crcPoly; |
| crc <<= 1; |
| crc ^= tmp; |
| } |
| } |
| *pCrc = crc; /* update crc value */ |
| |
| return nBits; |
| } |
| |
| /** |
| * \brief Calculate crc bytes. |
| * |
| * Calculate crc starting at current bitstream postion over nBytes. |
| * |
| * \param pCrc Pointer to an outlying allocated crc info structure. |
| * \param pCrcLookup Pointer to lookup table used for fast crc calculation. |
| * \param hBs Handle to current bit buffer structure. |
| * \param nBits Number of processing bytes. |
| * |
| * \return Number of processed bits. |
| */ |
| static inline INT calcCrc_Bytes( |
| USHORT * const pCrc, |
| const USHORT * pCrcLookup, |
| HANDLE_FDK_BITSTREAM hBs, |
| INT nBytes |
| ) |
| { |
| int i; |
| USHORT crc = *pCrc; /* get crc value */ |
| |
| if (hBs!=NULL) { |
| for (i=0; i<nBytes; i++) { |
| crc = (crc<<8)^pCrcLookup[((crc>>8)^((UCHAR)FDKreadBits(hBs,8)))&0xFF]; |
| } |
| } |
| else { |
| for (i=0; i<nBytes; i++) { |
| crc = (crc<<8)^pCrcLookup[((crc>>8)^((UCHAR)0))&0xFF]; |
| } |
| } |
| |
| *pCrc = crc; /* update crc value */ |
| |
| return (i); |
| } |
| |
| /** |
| * \brief Calculate crc. |
| * |
| * Calculate crc. Lenght depends on mBits parameter in FDKcrcStartReg() configuration. |
| * |
| * \param hCrcInfo Pointer to an outlying allocated crc info structure. |
| * \param hBs Pointer to current bit buffer structure. |
| * \param reg Crc region ID. |
| * |
| * \return Number of processed bits. |
| */ |
| static void crcCalc( |
| HANDLE_FDK_CRCINFO hCrcInfo, |
| HANDLE_FDK_BITSTREAM hBs, |
| const INT reg |
| ) |
| { |
| USHORT crc = hCrcInfo->crcValue; |
| CCrcRegData *rD = &hCrcInfo->crcRegData[reg]; |
| FDK_BITSTREAM bsReader; |
| |
| if (hBs->ConfigCache==BS_READER) { |
| bsReader = *hBs; |
| FDKpushBiDirectional(&bsReader, -(INT)(rD->validBits-FDKgetValidBits(&bsReader))); |
| } |
| else { |
| FDKinitBitStream(&bsReader, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, hBs->hBitBuf.ValidBits, BS_READER); |
| FDKpushBiDirectional(&bsReader, rD->validBits); |
| } |
| |
| int bits, rBits; |
| rBits = (rD->maxBits>=0) ? rD->maxBits : -rD->maxBits; /* ramaining bits */ |
| if ((rD->maxBits>0) && (((INT)rD->bitBufCntBits>>3<<3)<rBits) ) { |
| bits = rD->bitBufCntBits; |
| } |
| else { |
| bits = rBits; |
| } |
| |
| int words = bits >> 3; /* processing bytes */ |
| int mBits = bits & 0x7; /* modulo bits */ |
| |
| if(hCrcInfo->pCrcLookup) { |
| rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, &bsReader, words)<<3); |
| } |
| else { |
| rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, words<<3 ); |
| } |
| |
| /* remaining valid bits*/ |
| if(mBits!=0) { |
| rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, mBits ); |
| } |
| |
| if (rBits!=0) { |
| /* zero bytes */ |
| if ( (hCrcInfo->pCrcLookup) && (rBits>8) ) { |
| rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, NULL, rBits>>3)<<3); |
| } |
| /* remaining zero bits */ |
| if (rBits!=0) { |
| rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, NULL, rBits ); |
| } |
| } |
| |
| hCrcInfo->crcValue = crc; |
| } |
| |
