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Diffstat (limited to 'libMpegTPEnc/src/tpenc_adts.cpp')
| -rw-r--r-- | libMpegTPEnc/src/tpenc_adts.cpp | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/libMpegTPEnc/src/tpenc_adts.cpp b/libMpegTPEnc/src/tpenc_adts.cpp new file mode 100644 index 0000000..39460f0 --- /dev/null +++ b/libMpegTPEnc/src/tpenc_adts.cpp @@ -0,0 +1,315 @@ + +/* ----------------------------------------------------------------------------------------------------------- +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: Alex Groeschel + contents/description: ADTS Transport Headers support + +******************************************************************************/ + +#include "tpenc_adts.h" + + +#include "tpenc_lib.h" +#include "tpenc_asc.h" + + +int adtsWrite_CrcStartReg( + HANDLE_ADTS pAdts, /*!< pointer to adts stucture */ + HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ + int mBits /*!< number of bits in crc region */ + ) +{ + if (pAdts->protection_absent) { + return 0; + } + return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) ); +} + +void adtsWrite_CrcEndReg( + HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */ + HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */ + int reg /*!< crc region */ + ) +{ + if (pAdts->protection_absent == 0) + { + FDKcrcEndReg(&pAdts->crcInfo, hBs, reg); + } +} + +int adtsWrite_GetHeaderBits( HANDLE_ADTS hAdts ) +{ + int bits = 0; + + if (hAdts->currentBlock == 0) { + /* Static and variable header bits */ + bits = 56; + if (!hAdts->protection_absent) { + /* Add header/ single raw data block CRC bits */ + bits += 16; + if (hAdts->num_raw_blocks>0) { + /* Add bits of raw data block position markers */ + bits += (hAdts->num_raw_blocks)*16; + } + } + } + if (!hAdts->protection_absent && hAdts->num_raw_blocks>0) { + /* Add raw data block CRC bits. Not really part of the header, put they cause bit overhead to be accounted. */ + bits += 16; + } + + hAdts->headerBits = bits; + + return bits; +} + +INT adtsWrite_Init(HANDLE_ADTS hAdts, CODER_CONFIG *config) +{ + /* Sanity checks */ + if ( config->nSubFrames < 1 + || config->nSubFrames > 4 + || (int)config->aot > 4 + || (int)config->aot < 1 ) { + return -1; + } + + /* fixed header */ + if (config->flags & CC_MPEG_ID) { + hAdts->mpeg_id = 0; /* MPEG 4 */ + } else { + hAdts->mpeg_id = 1; /* MPEG 2 */ + } + hAdts->layer=0; + hAdts->protection_absent = ! (config->flags & CC_PROTECTION); + hAdts->profile = ((int)config->aot) - 1; + hAdts->sample_freq_index = getSamplingRateIndex(config->samplingRate); + hAdts->sample_freq = config->samplingRate; + hAdts->private_bit=0; + hAdts->channel_mode = config->channelMode; + hAdts->original=0; + hAdts->home=0; + /* variable header */ + hAdts->copyright_id=0; + hAdts->copyright_start=0; + + hAdts->num_raw_blocks=config->nSubFrames-1; /* 0 means 1 raw data block */ + + FDKcrcInit(&hAdts->crcInfo, 0x8005, 0xFFFF, 16); + + hAdts->currentBlock = 0; + + + return 0; +} + +int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts, + HANDLE_FDK_BITSTREAM hBitStream, + int buffer_fullness, + int frame_length) +{ + INT crcIndex = 0; + + + hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts); + + FDK_ASSERT(((frame_length+hAdts->headerBits)/8)<0x2000); /*13 bit*/ + FDK_ASSERT(buffer_fullness<0x800); /* 11 bit */ + + if (!hAdts->protection_absent) { + FDKcrcReset(&hAdts->crcInfo); + } + + if (hAdts->currentBlock == 0) { + FDKresetBitbuffer(hBitStream, BS_WRITER); + } + + hAdts->subFrameStartBit = FDKgetValidBits(hBitStream); + + /* Skip new header if this is raw data block 1..n */ + if (hAdts->currentBlock == 0) + { + FDKresetBitbuffer(hBitStream, BS_WRITER); + + if (hAdts->num_raw_blocks == 0) { + crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0); + } + + /* fixed header */ + FDKwriteBits(hBitStream, 0xFFF, 12); + FDKwriteBits(hBitStream, hAdts->mpeg_id, 1); + FDKwriteBits(hBitStream, hAdts->layer, 2); + FDKwriteBits(hBitStream, hAdts->protection_absent, 1); + FDKwriteBits(hBitStream, hAdts->profile, 2); + FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4); + FDKwriteBits(hBitStream, hAdts->private_bit, 1); + FDKwriteBits(hBitStream, getChannelConfig(hAdts->channel_mode), 3); + FDKwriteBits(hBitStream, hAdts->original, 1); + FDKwriteBits(hBitStream, hAdts->home, 1); + /* variable header */ + FDKwriteBits(hBitStream, hAdts->copyright_id, 1); + FDKwriteBits(hBitStream, hAdts->copyright_start, 1); + FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits)>>3, 13); + FDKwriteBits(hBitStream, buffer_fullness, 11); + FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2); + + if (!hAdts->protection_absent) { + int i; + + /* End header CRC portion for single raw data block and write dummy zero values for unknown fields. */ + if (hAdts->num_raw_blocks == 0) { + adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex); + } else { + for (i=0; i<hAdts->num_raw_blocks; i++) { + FDKwriteBits(hBitStream, 0, 16); + } + } + FDKwriteBits(hBitStream, 0, 16); + } + } /* End of ADTS header */ + + return 0; +} + +void adtsWrite_EndRawDataBlock(HANDLE_ADTS hAdts, + HANDLE_FDK_BITSTREAM hBs, + int *pBits) +{ + if (!hAdts->protection_absent) { + FDK_BITSTREAM bsWriter; + + FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); + FDKpushFor(&bsWriter, 56); + + if (hAdts->num_raw_blocks == 0) { + FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); + } else { + int distance; + + /* Write CRC of current raw data block */ + FDKwriteBits(hBs, FDKcrcGetCRC(&hAdts->crcInfo), 16); + + /* Write distance to current data block */ + if (hAdts->currentBlock < hAdts->num_raw_blocks) { + FDKpushFor(&bsWriter, hAdts->currentBlock*16); + distance = FDKgetValidBits(hBs) - (56 + (hAdts->num_raw_blocks)*16 + 16); + FDKwriteBits(&bsWriter, distance>>3, 16); + } + } + FDKsyncCache(&bsWriter); + } + + /* Write total frame lenth for multiple raw data blocks and header CRC */ + if (hAdts->num_raw_blocks > 0 && hAdts->currentBlock == hAdts->num_raw_blocks) { + FDK_BITSTREAM bsWriter; + int crcIndex = 0; + + FDKinitBitStream(&bsWriter, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, 0, BS_WRITER); + + if (!hAdts->protection_absent) { + FDKcrcReset(&hAdts->crcInfo); + crcIndex = FDKcrcStartReg(&hAdts->crcInfo, &bsWriter, 0); + } + /* Write total frame length */ + FDKpushFor(&bsWriter, 56-28+2); + FDKwriteBits(&bsWriter, FDKgetValidBits(hBs)>>3, 13); + + /* Write header CRC */ + if (!hAdts->protection_absent) { + FDKpushFor(&bsWriter, 11+2 + (hAdts->num_raw_blocks)*16); + FDKcrcEndReg(&hAdts->crcInfo, &bsWriter, crcIndex); + FDKwriteBits(&bsWriter, FDKcrcGetCRC(&hAdts->crcInfo), 16); + } + FDKsyncCache(&bsWriter); + } + + /* Correct *pBits to reflect the amount of bits of the current subframe */ + *pBits -= hAdts->subFrameStartBit; + if (!hAdts->protection_absent && hAdts->num_raw_blocks > 0) { + /* Fixup CRC bits, since they come after each raw data block */ + *pBits += 16; + } + hAdts->currentBlock++; +} + |