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64 lines
1.9 KiB
64 lines
1.9 KiB
2 years ago
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/*
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* H.265 video codec.
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* Copyright (c) 2013-2014 struktur AG, Dirk Farin <farin@struktur.de>
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*
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* This file is part of libde265.
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*
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* libde265 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* libde265 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libde265. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DE265_BITSTREAM_H
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#define DE265_BITSTREAM_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDBOOL_H
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#include <stdbool.h>
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#endif
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#include <stdint.h>
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#define MAX_UVLC_LEADING_ZEROS 20
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#define UVLC_ERROR -99999
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typedef struct {
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uint8_t* data;
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int bytes_remaining;
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uint64_t nextbits; // left-aligned bits
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int nextbits_cnt;
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} bitreader;
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void bitreader_init(bitreader*, unsigned char* buffer, int len);
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void bitreader_refill(bitreader*); // refill to at least 56+1 bits
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int next_bit(bitreader*);
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int next_bit_norefill(bitreader*);
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int get_bits(bitreader*, int n);
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int get_bits_fast(bitreader*, int n);
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int peek_bits(bitreader*, int n);
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void skip_bits(bitreader*, int n);
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void skip_bits_fast(bitreader*, int n);
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void skip_to_byte_boundary(bitreader*);
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void prepare_for_CABAC(bitreader*);
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int get_uvlc(bitreader*); // may return UVLC_ERROR
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int get_svlc(bitreader*); // may return UVLC_ERROR
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bool check_rbsp_trailing_bits(bitreader*); // return true if remaining filler bits are all zero
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#endif
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