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63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/*! \file bitstream.h
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\brief Bitstream related functions
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\author Marko Viitanen
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\date 2012-05
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This file has all bitstream headers
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*/
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#ifndef _BITSTREAM_H
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#define _BITSTREAM_H
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typedef struct
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{
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uint32_t data[32];
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uint8_t cur_byte;
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uint8_t cur_bit;
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FILE* output;
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uint8_t* buffer;
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uint32_t buffer_pos;
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uint32_t bufferlen;
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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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}bitTable;
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extern bitTable *g_exp_table;
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int floorLog2(unsigned int n);
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void bitstream_alloc(bitstream* stream, uint32_t alloc);
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void bitstream_clear_buffer(bitstream* stream);
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void bitstream_init(bitstream* stream);
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void bitstream_put(bitstream* 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) { 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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void bitstream_flush(bitstream* stream);
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void init_exp_golomb(uint32_t len);
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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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static int WRITE_VALUE = 0;
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#define WRITE_U(stream, data, bits, name) { printf("%8d %-40s u(%d) : %d\n",WRITE_VALUE, name,bits,data); bitstream_put(stream,data,bits); WRITE_VALUE++;}
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#define WRITE_UE(stream, data, name) { printf("%8d %-40s ue(v): %d\n",WRITE_VALUE, name,data); bitstream_put_ue(stream,data); WRITE_VALUE++;}
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#define WRITE_SE(stream, data, name) { printf("%8d %-40s se(v): %d\n",WRITE_VALUE, name,data); bitstream_put_se(stream,(data)); WRITE_VALUE++;}
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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 |