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