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100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
#ifndef BITSTREAM_H_
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#define BITSTREAM_H_
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/*****************************************************************************
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* This file is part of Kvazaar HEVC encoder.
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*
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* Copyright (C) 2013-2015 Tampere University of Technology and others (see
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* COPYING file).
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*
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* Kvazaar 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 2.1 of the License, or (at your
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* option) any later version.
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*
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* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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/*
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* \file
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* \brief Bitstream can be written to one or several bits at a time.
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*/
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#include "kvazaar.h"
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#include "global.h"
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/**
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* A stream of bits.
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*/
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typedef struct bitstream_t
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{
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/// \brief Total number of complete bytes.
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uint32_t len;
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/// \brief Pointer to the first chunk, or NULL.
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kvz_data_chunk *first;
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/// \brief Pointer to the last chunk, or NULL.
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kvz_data_chunk *last;
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/// \brief The incomplete byte.
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uint8_t data;
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/// \brief Number of bits in the incomplete byte.
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uint8_t cur_bit;
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uint8_t zerocount;
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} bitstream_t;
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typedef struct
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{
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uint8_t len;
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uint32_t value;
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} bit_table_t;
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extern bit_table_t kvz_g_exp_table[EXP_GOLOMB_TABLE_SIZE];
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void kvz_init_exp_golomb();
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void kvz_bitstream_init(bitstream_t * stream);
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kvz_data_chunk * kvz_bitstream_alloc_chunk();
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kvz_data_chunk * kvz_bitstream_take_chunks(bitstream_t *stream);
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void kvz_bitstream_free_chunks(kvz_data_chunk *chunk);
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void kvz_bitstream_finalize(bitstream_t * stream);
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uint64_t kvz_bitstream_tell(const bitstream_t * stream);
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void kvz_bitstream_writebyte(bitstream_t *stream, uint8_t byte);
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void kvz_bitstream_move(bitstream_t *dst, bitstream_t *src);
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void kvz_bitstream_clear(bitstream_t *stream);
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void kvz_bitstream_put(bitstream_t *stream, uint32_t data, uint8_t bits);
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/* Use macros to force inlining */
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#define bitstream_put_ue(stream, data) { kvz_bitstream_put(stream,kvz_g_exp_table[data].value,kvz_g_exp_table[data].len); }
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#define bitstream_put_se(stream, data) { uint32_t index=(uint32_t)(((data)<=0)?(-(data))<<1:((data)<<1)-1); \
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kvz_bitstream_put(stream,kvz_g_exp_table[index].value,kvz_g_exp_table[index].len); }
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void kvz_bitstream_add_rbsp_trailing_bits(bitstream_t *stream);
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void kvz_bitstream_align(bitstream_t *stream);
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void kvz_bitstream_align_zero(bitstream_t *stream);
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/* In debug mode print out some extra info */
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#ifdef KVZ_DEBUG_PRINT_CABAC
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/* Counter to keep up with bits written */
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#define WRITE_U(stream, data, bits, name) { printf("%-40s u(%d) : %d\n", name,bits,data); kvz_bitstream_put(stream,data,bits);}
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#define WRITE_UE(stream, data, name) { printf("%-40s ue(v): %d\n", name,data); bitstream_put_ue(stream,data);}
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#define WRITE_SE(stream, data, name) { printf("%-40s se(v): %d\n", name,data); bitstream_put_se(stream,(data));}
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#else
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#define WRITE_U(stream, data, bits, name) { kvz_bitstream_put(stream,data,bits); }
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#define WRITE_UE(stream, data, name) { bitstream_put_ue(stream,data); }
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#define WRITE_SE(stream, data, name) { bitstream_put_se(stream,data); }
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#endif
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#endif
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