xeye_ atsu / Mbed 2 deprecated I2S_AIC23B_RiceGolomb

パラメータを適応変化させる事により圧縮率を向上させた動的ライス・ゴロム符号を利用した可逆圧縮方式。圧縮ソフト、圧縮率のMATLABシミュレーションは詳細はInterface誌2011年8月号に掲載されるRX62Nマイコン連動特集にて掲載予定。

Dependencies:   mbed

Lossless_lib/_bitio.cpp@0:d920d64db582, 2011-03-30 (annotated)

Committer:
lynxeyed_atsu
Date:
Wed Mar 30 06:05:24 2011 +0000
Revision:
0:d920d64db582
alpha

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lynxeyed_atsu 0:d920d64db582 1 #include "mbed.h"
lynxeyed_atsu 0:d920d64db582 2 #include "string"
lynxeyed_atsu 0:d920d64db582 3 #include "_bitio.h"
lynxeyed_atsu 0:d920d64db582 4
lynxeyed_atsu 0:d920d64db582 5
lynxeyed_atsu 0:d920d64db582 6 //FILE *infp, *outfp;
lynxeyed_atsu 0:d920d64db582 7 int getcount, putcount;
lynxeyed_atsu 0:d920d64db582 8 int bitbuf;
lynxeyed_atsu 0:d920d64db582 9
lynxeyed_atsu 0:d920d64db582 10
lynxeyed_atsu 0:d920d64db582 11 void init_bit_o(void)
lynxeyed_atsu 0:d920d64db582 12 {
lynxeyed_atsu 0:d920d64db582 13 putcount = 8; bitbuf = 0;
lynxeyed_atsu 0:d920d64db582 14 }
lynxeyed_atsu 0:d920d64db582 15
lynxeyed_atsu 0:d920d64db582 16 void init_bit_i(void)
lynxeyed_atsu 0:d920d64db582 17 {
lynxeyed_atsu 0:d920d64db582 18 getcount = 0; bitbuf = 0;
lynxeyed_atsu 0:d920d64db582 19 }
lynxeyed_atsu 0:d920d64db582 20
lynxeyed_atsu 0:d920d64db582 21
lynxeyed_atsu 0:d920d64db582 22 Uint getbit(void)
lynxeyed_atsu 0:d920d64db582 23 {
lynxeyed_atsu 0:d920d64db582 24 int flag;
lynxeyed_atsu 0:d920d64db582 25 if (--getcount >= 0) return (bitbuf >> getcount) & 1U;
lynxeyed_atsu 0:d920d64db582 26 getcount = 7;
lynxeyed_atsu 0:d920d64db582 27 if((flag = fgetc(infp))==EOF)return OVERRUN;
lynxeyed_atsu 0:d920d64db582 28 else bitbuf = flag;
lynxeyed_atsu 0:d920d64db582 29 return (bitbuf >> 7) & 1U;
lynxeyed_atsu 0:d920d64db582 30 }
lynxeyed_atsu 0:d920d64db582 31
lynxeyed_atsu 0:d920d64db582 32 Uint getbits(int n)
lynxeyed_atsu 0:d920d64db582 33 {
lynxeyed_atsu 0:d920d64db582 34 Uint x = 0;
lynxeyed_atsu 0:d920d64db582 35 if (n < 1 || 25 < n) return 0;
lynxeyed_atsu 0:d920d64db582 36 while (n > getcount) {
lynxeyed_atsu 0:d920d64db582 37 n -= getcount;
lynxeyed_atsu 0:d920d64db582 38 x |= rightbits(getcount, bitbuf) << n;
lynxeyed_atsu 0:d920d64db582 39 bitbuf = fgetc(infp);
lynxeyed_atsu 0:d920d64db582 40 getcount = 8;
lynxeyed_atsu 0:d920d64db582 41 }
lynxeyed_atsu 0:d920d64db582 42 getcount -= n;
lynxeyed_atsu 0:d920d64db582 43 return x | rightbits(n, bitbuf >> getcount);
lynxeyed_atsu 0:d920d64db582 44 }
lynxeyed_atsu 0:d920d64db582 45
lynxeyed_atsu 0:d920d64db582 46
lynxeyed_atsu 0:d920d64db582 47 void putbit(Uint bit)
lynxeyed_atsu 0:d920d64db582 48 {
lynxeyed_atsu 0:d920d64db582 49 putcount--;
lynxeyed_atsu 0:d920d64db582 50 if (bit != 0) bitbuf |= (1 << putcount);
lynxeyed_atsu 0:d920d64db582 51 if (putcount == 0) {
lynxeyed_atsu 0:d920d64db582 52 if (fputc(bitbuf, outfp) == EOF) error("can't write\r\n");
lynxeyed_atsu 0:d920d64db582 53 bitbuf = 0; putcount = 8;
lynxeyed_atsu 0:d920d64db582 54 }
lynxeyed_atsu 0:d920d64db582 55 }
lynxeyed_atsu 0:d920d64db582 56
lynxeyed_atsu 0:d920d64db582 57
lynxeyed_atsu 0:d920d64db582 58 void putbits(int n, Uint x)
lynxeyed_atsu 0:d920d64db582 59 {
lynxeyed_atsu 0:d920d64db582 60 if (n < 1 || 25 < n) return;
lynxeyed_atsu 0:d920d64db582 61 while (n >= putcount) {
lynxeyed_atsu 0:d920d64db582 62 n -= putcount;
lynxeyed_atsu 0:d920d64db582 63 bitbuf |= rightbits(putcount, x >> n);
lynxeyed_atsu 0:d920d64db582 64 if (fputc(bitbuf, outfp) == EOF) error("cant write\r\n");
lynxeyed_atsu 0:d920d64db582 65 bitbuf = 0U;
lynxeyed_atsu 0:d920d64db582 66 putcount = 8;
lynxeyed_atsu 0:d920d64db582 67 }
lynxeyed_atsu 0:d920d64db582 68 putcount -= n;
lynxeyed_atsu 0:d920d64db582 69 bitbuf |= rightbits(n, x) << putcount;
lynxeyed_atsu 0:d920d64db582 70 }
lynxeyed_atsu 0:d920d64db582 71