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104 lines
3.3 KiB
C
104 lines
3.3 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) 2013-2014 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
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Kvazaar 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along 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 "global.h"
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typedef enum {BITSTREAM_TYPE_FILE, BITSTREAM_TYPE_MEMORY} bitstream_type;
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#define BASE_BITSTREAM uint8_t data; uint8_t cur_bit; uint8_t zerocount; bitstream_type type;
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//Size of the allocation for a memory bitstream in bytes
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#define BITSTREAM_MEMORY_CHUNK_SIZE 4096
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typedef struct
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{
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BASE_BITSTREAM
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} bitstream_base;
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typedef struct
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{
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BASE_BITSTREAM
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FILE* output;
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} bitstream_file;
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typedef struct
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{
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BASE_BITSTREAM
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uint8_t* output_data;
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uint32_t output_length;
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uint32_t allocated_length;
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} bitstream_mem;
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typedef union
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{
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bitstream_base base;
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bitstream_file file;
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bitstream_mem mem;
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} bitstream;
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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;
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extern const bit_table *g_exp_table;
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int bitstream_init(bitstream * stream, bitstream_type type);
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int bitstream_finalize(bitstream * stream);
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void bitstream_put(bitstream *stream, uint32_t data, uint8_t bits);
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int bitstream_writebyte(bitstream *stream_abstract, uint8_t byte);
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long long unsigned int bitstream_tell(const bitstream * stream);
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int bitstream_append(bitstream *dst, const bitstream *src);
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int bitstream_clear(bitstream *stream);
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/* Use macros to force inlining */
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#define bitstream_put_ue(stream, data) { bitstream_put(stream,g_exp_table[data].value,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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bitstream_put(stream,g_exp_table[index].value,g_exp_table[index].len); }
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void bitstream_align(bitstream *stream);
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void bitstream_align_zero(bitstream *stream);
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int init_exp_golomb(uint32_t len);
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void free_exp_golomb();
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/* In debug mode print out some extra info */
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#ifdef NOTDEFINED//_DEBUG
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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); 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) { 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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