/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved.
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// MP3 internal implementation details (Huffman encoding)
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// C++ header
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#ifndef _MP3_INTERNALS_HUFFMAN_HH
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#define _MP3_INTERNALS_HUFFMAN_HH
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#ifndef _MP3_INTERNALS_HH
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#include "MP3Internals.hh"
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#endif
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void updateSideInfoForHuffman(MP3SideInfo& sideInfo, Boolean isMPEG2,
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unsigned char const* mainDataPtr,
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unsigned p23L0, unsigned p23L1,
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unsigned& part23Length0a,
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unsigned& part23Length0aTruncation,
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unsigned& part23Length0b,
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unsigned& part23Length0bTruncation,
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unsigned& part23Length1a,
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unsigned& part23Length1aTruncation,
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unsigned& part23Length1b,
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unsigned& part23Length1bTruncation);
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#define SSLIMIT 18
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class MP3HuffmanEncodingInfo {
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public:
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MP3HuffmanEncodingInfo(Boolean includeDecodedValues = False);
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~MP3HuffmanEncodingInfo();
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public:
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unsigned numSamples;
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unsigned allBitOffsets[SBLIMIT*SSLIMIT + 1];
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unsigned reg1Start, reg2Start, bigvalStart; /* special bit offsets */
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unsigned* decodedValues;
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};
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/* forward */
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void MP3HuffmanDecode(MP3SideInfo::gr_info_s_t* gr, Boolean isMPEG2,
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unsigned char const* fromBasePtr,
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unsigned fromBitOffset, unsigned fromLength,
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unsigned& scaleFactorsLength,
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MP3HuffmanEncodingInfo& hei);
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extern unsigned char huffdec[]; // huffman table data
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// The following are used if we process Huffman-decoded values
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#ifdef FOUR_BYTE_SAMPLES
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#define BYTES_PER_SAMPLE_VALUE 4
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#else
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#ifdef TWO_BYTE_SAMPLES
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#define BYTES_PER_SAMPLE_VALUE 2
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#else
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// ONE_BYTE_SAMPLES
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#define BYTES_PER_SAMPLE_VALUE 1
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#endif
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#endif
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#ifdef DO_HUFFMAN_ENCODING
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unsigned MP3HuffmanEncode(MP3SideInfo::gr_info_s_t const* gr,
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unsigned char const* fromPtr,
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unsigned char* toPtr, unsigned toBitOffset,
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unsigned numHuffBits);
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#endif
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#endif
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