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143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
#ifndef __RLE_H
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#define __RLE_H
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#include <string.h>
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#include <assert.h>
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#include "mem.h"
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#include "bitcoder.h"
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#include "golomb.h"
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#if defined(RLECODER)
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#define OUTPUT_BIT(rlecoder,bit) rlecoder_write_bit(rlecoder,bit)
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#define INPUT_BIT(rlecoder) rlecoder_read_bit(rlecoder)
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#define OUTPUT_BIT_DIRECT(coder,bit) bitcoder_write_bit(&(coder)->bitcoder,bit)
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#define INPUT_BIT_DIRECT(rlecoder) bitcoder_read_bit(&(rlecoder)->bitcoder)
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#define ENTROPY_CODER RLECoderState
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#define ENTROPY_ENCODER_INIT(coder,limit) rlecoder_encoder_init(coder,limit)
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#define ENTROPY_ENCODER_DONE(coder) rlecoder_encoder_done(coder)
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#define ENTROPY_ENCODER_FLUSH(coder) rlecoder_encoder_flush(coder)
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#define ENTROPY_DECODER_INIT(coder,bitstream,limit) \
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rlecoder_decoder_init(coder,bitstream,limit)
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#define ENTROPY_DECODER_DONE(coder) /* nothing to do ... */
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#define ENTROPY_CODER_BITSTREAM(coder) ((coder)->bitcoder.bitstream)
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#define ENTROPY_CODER_EOS(coder) ((coder)->bitcoder.eos)
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#define ENTROPY_CODER_SYMBOL(coder) ((coder)->symbol)
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#define ENTROPY_CODER_RUNLENGTH(coder) ((coder)->count)
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#define ENTROPY_CODER_SKIP(coder,skip) do { (coder)->count -= skip; } while (0)
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#endif
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typedef struct
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{
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int symbol;
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uint32_t count; /* have seen count symbol's */
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BitCoderState bitcoder;
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GolombAdaptiveCoderState golomb_state[2]; /* 2 states for 2 symbols... */
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int have_seen_1;
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} RLECoderState;
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/*
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* bit should be 0 or 1 !!!
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*/
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static inline void
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rlecoder_write_bit (RLECoderState * s, int bit)
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{
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assert (bit == 0 || bit == 1);
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if (s->symbol == -1) {
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s->symbol = bit & 1;
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s->count = 1;
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s->have_seen_1 = bit;
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bitcoder_write_bit (&s->bitcoder, bit);
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}
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if (s->symbol != bit) {
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golombcoder_encode_number (&s->golomb_state[s->symbol],
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&s->bitcoder, s->count);
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s->symbol = ~s->symbol & 1;
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s->have_seen_1 = 1;
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s->count = 1;
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} else
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s->count++;
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}
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static inline int
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rlecoder_read_bit (RLECoderState * s)
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{
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if (s->count == 0) {
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s->symbol = ~s->symbol & 1;
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s->count = golombcoder_decode_number (&s->golomb_state[s->symbol],
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&s->bitcoder);
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if (s->bitcoder.eos) {
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s->symbol = 0;
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s->count = ~0;
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}
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}
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s->count--;
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return (s->symbol);
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}
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int coder_id = 0;
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FILE *file = NULL;
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static inline void
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rlecoder_encoder_init (RLECoderState * s, uint32_t limit)
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{
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bitcoder_encoder_init (&s->bitcoder, limit);
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s->symbol = -1;
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s->have_seen_1 = 0;
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s->golomb_state[0].count = 0;
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s->golomb_state[1].count = 0;
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s->golomb_state[0].bits = 5 << 3;
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s->golomb_state[1].bits = 5 << 3;
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}
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/**
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* once you called this, you better should not encode any more symbols ...
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*/
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static inline uint32_t
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rlecoder_encoder_flush (RLECoderState * s)
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{
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if (s->symbol == -1 || !s->have_seen_1)
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return 0;
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golombcoder_encode_number (&s->golomb_state[s->symbol],
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&s->bitcoder, s->count);
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return bitcoder_flush (&s->bitcoder);
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}
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static inline void
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rlecoder_decoder_init (RLECoderState * s, uint8_t * bitstream, uint32_t limit)
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{
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bitcoder_decoder_init (&s->bitcoder, bitstream, limit);
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s->golomb_state[0].count = 0;
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s->golomb_state[1].count = 0;
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s->golomb_state[0].bits = 5 << 3;
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s->golomb_state[1].bits = 5 << 3;
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s->symbol = bitcoder_read_bit (&s->bitcoder);
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s->count = golombcoder_decode_number (&s->golomb_state[s->symbol],
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&s->bitcoder) - 1;
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if (s->bitcoder.eos) {
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s->symbol = 0;
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s->count = ~0;
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}
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}
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static inline void
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rlecoder_encoder_done (RLECoderState * s)
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{
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bitcoder_encoder_done (&s->bitcoder);
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}
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#endif
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