kopia lustrzana https://github.com/rs1729/RS
432 wiersze
11 KiB
C
432 wiersze
11 KiB
C
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/*
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* detect/identify radiosondes
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* DFM, RS92-SGP, RS41, M10, iMet-1-AB
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#ifdef CYGWIN
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#include <fcntl.h> // cygwin: _setmode()
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#include <io.h>
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#endif
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typedef unsigned char ui8_t;
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typedef unsigned int ui32_t;
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time_t rawtime;
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struct tm *gmt;
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int wavloaded = 0,
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option_gmt = 0,
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option_silent = 0,
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option_b = 0;
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#define DFM 2
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#define RS41 3
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#define RS92 4
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#define M10 5
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#define iMet 6
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#define HEADLEN 32
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#define HEADOFS 0 // HEADLEN+HEADOFS=32
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//int dfm_baudrate = 2500;
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char dfm_header[] = "01100101011001101010010110101010";
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//int vai_baudrate = 4800;
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char rs41_header[] = "00001000011011010101001110001000"
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"01000100011010010100100000011111";
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char rs92_header[] = "10100110011001101001"
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"10100110011001101001"
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"10100110011001101001"
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"10100110011001101001"
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"1010011001100110100110101010100110101001";
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//int m10_baudrate = 9600;
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char m10_header[] = "00110011001100110101100110110011";
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//int imet_baudrate = 9600;
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char imet_header[] = "11110000111100001111000011110000"
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"11110000""10101100110010101100101010101100"
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"11110000""10101100110010101100101010101100";
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char buf25[HEADLEN+1] = "x";
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int bufpos25 = -1;
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char buf48[HEADLEN+1] = "x";
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int bufpos48 = -1;
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char buf96[HEADLEN+1] = "x";
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int bufpos96 = -1;
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int L, M;
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char *bufb = NULL;
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float *bufs = NULL;
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/* -------------------------------------------------------------------------- */
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int sample_rate = 0, bits_sample = 0, channels = 0;
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int findstr(char *buff, char *str, int pos) {
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int i;
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for (i = 0; i < 4; i++) {
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if (buff[(pos+i)%4] != str[i]) break;
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}
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return i;
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}
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int read_wav_header(FILE *fp) {
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char txt[4+1] = "\0\0\0\0";
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unsigned char dat[4];
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int byte, p=0;
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if (fread(txt, 1, 4, fp) < 4) return -1;
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if (strncmp(txt, "RIFF", 4)) return -1;
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if (fread(txt, 1, 4, fp) < 4) return -1;
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// pos_WAVE = 8L
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if (fread(txt, 1, 4, fp) < 4) return -1;
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if (strncmp(txt, "WAVE", 4)) return -1;
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// pos_fmt = 12L
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for ( ; ; ) {
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if ( (byte=fgetc(fp)) == EOF ) return -1;
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txt[p % 4] = byte;
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p++; if (p==4) p=0;
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if (findstr(txt, "fmt ", p) == 4) break;
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}
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if (fread(dat, 1, 4, fp) < 4) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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channels = dat[0] + (dat[1] << 8);
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if (fread(dat, 1, 4, fp) < 4) return -1;
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memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24);
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if (fread(dat, 1, 4, fp) < 4) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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//byte = dat[0] + (dat[1] << 8);
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if (fread(dat, 1, 2, fp) < 2) return -1;
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bits_sample = dat[0] + (dat[1] << 8);
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// pos_dat = 36L + info
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for ( ; ; ) {
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if ( (byte=fgetc(fp)) == EOF ) return -1;
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txt[p % 4] = byte;
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p++; if (p==4) p=0;
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if (findstr(txt, "data", p) == 4) break;
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}
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if (fread(dat, 1, 4, fp) < 4) return -1;
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if (!option_silent) {
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fprintf(stderr, "sample_rate: %d\n", sample_rate);
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fprintf(stderr, "bits : %d\n", bits_sample);
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fprintf(stderr, "channels : %d\n", channels);
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}
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if ((bits_sample != 8) && (bits_sample != 16)) return -1;
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return 0;
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}
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static int f32read_sample(FILE *fp, float *s) {
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int i;
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short b = 0;
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for (i = 0; i < channels; i++) {
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if (fread( &b, bits_sample/8, 1, fp) != 1) return EOF;
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if (i == 0) { // i = 0: links bzw. mono
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//if (bits_sample == 8) sint = b-128; // 8bit: 00..FF, centerpoint 0x80=128
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//if (bits_sample == 16) sint = (short)b;
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if (bits_sample == 8) { b -= 128; }
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*s = b/128.0;
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if (bits_sample == 16) { *s /= 256.0; }
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}
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}
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return 0;
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}
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int par=1, par_alt=1;
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unsigned long sample_count = 0;
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int read_bits_fsk(FILE *fp, int *bit, int *len) {
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float s = 0.0;
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int n;
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n = 0;
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do{
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if (f32read_sample(fp, &s) == EOF) return EOF;
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if (option_b) {
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bufs[sample_count%M] = s;
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}
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sample_count++;
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par_alt = par;
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par = (s >= 0.0) ? 1 : -1;
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n++;
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} while (par*par_alt > 0);
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*len = n;
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*bit = (1+par_alt)/2; // oben 1, unten -1
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//*bit = (1-par_alt)/2;// sdr#<rev1381?, invers: unten 1, oben -1
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return 0;
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}
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int read_bufb(char *bits, unsigned int mvp, int reset, float spb) {
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static unsigned int rcount;
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static float rbitgrenze;
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double sum = 0.0;
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if (reset) {
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rcount = 0;
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rbitgrenze = 0;
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}
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rbitgrenze += spb;
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do {
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sum += bufs[(rcount + mvp + M) % M];
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rcount++;
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} while (rcount < rbitgrenze); // n < spb
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if (sum >= 0) *bits = '1';
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else *bits = '0';
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return 0;
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}
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int bufscmp(char *hdr, int len, unsigned int bufspos, float spb) {
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int errs = 0;
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int pos;
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for (pos = 0; pos < len; pos += 1) {
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read_bufb(bufb+pos, bufspos, pos==0, spb);
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}
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bufb[pos] = '\0';
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while (len > 0) {
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if (bufb[len-1] != hdr[len-1]) errs += 1;
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len--;
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}
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return errs;
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}
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/* -------------------------------------------------------------------------- */
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char inv(char c) {
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if (c == '0') return '1';
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if (c == '1') return '0';
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return c;
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}
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void inc_buf(int *bufpos) {
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*bufpos = (*bufpos+1) % HEADLEN;
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}
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int compare(char buf[], char header[], int bufpos) {
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int i, j;
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i = 0;
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j = bufpos;
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while (i < HEADLEN) {
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if (j < 0) j = HEADLEN-1;
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if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break;
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j--;
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i++;
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}
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if (i == HEADLEN) return 1;
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i = 0;
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j = bufpos;
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while (i < HEADLEN) {
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if (j < 0) j = HEADLEN-1;
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if (buf[j] != inv(header[HEADOFS+HEADLEN-1-i])) break;
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j--;
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i++;
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}
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if (i == HEADLEN) return -1;
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return 0;
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}
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/* -------------------------------------------------------------------------- */
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int main(int argc, char **argv) {
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FILE *fp;
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char *fpname;
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int header_found, bit, len, i;
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int len25, len48, len96;
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int zeit = 0;
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int herrs = 0;
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#ifdef CYGWIN
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_setmode(fileno(stdin), _O_BINARY); // _setmode(_fileno(stdin), _O_BINARY);
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setbuf(stdout, NULL);
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#endif
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fpname = argv[0];
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++argv;
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while ((*argv) && (!wavloaded)) {
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if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
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fprintf(stderr, "%s [-t nn] audio.wav\n", fpname);
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return 0;
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}
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else if ( (strcmp(*argv, "-s") == 0) || (strcmp(*argv, "--silent") == 0) ) {
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option_silent = 1;
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}
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else if ( (strcmp(*argv, "-z") == 0) || (strcmp(*argv, "--zulu") == 0) ) {
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option_gmt = 1;
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}
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else if ( (strcmp(*argv, "-t") == 0) || (strcmp(*argv, "--time") == 0) ) {
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++argv;
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if (*argv) zeit = atoi(*argv);
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else return -1;
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}
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else if ( (strcmp(*argv, "-b") == 0) ) {
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option_b = 1;
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}
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else {
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fp = fopen(*argv, "rb");
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if (fp == NULL) {
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fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
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return -1;
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}
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wavloaded = 1;
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}
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++argv;
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}
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if (!wavloaded) fp = stdin;
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i = read_wav_header(fp);
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if (i) {
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fclose(fp);
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return -1;
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}
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if (option_b) {
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L = strlen(m10_header);
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M = L*sample_rate/9600.0;
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bufb = (char *)calloc( L+3, sizeof(char)); if (bufb == NULL) return -1;
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bufs = (float *)calloc( M+17, sizeof(float)); if (bufs == NULL) return -1;
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}
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header_found = 0;
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while (!read_bits_fsk(fp, &bit, &len) && !header_found) {
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len25 = (int) (len * 2500.0 / sample_rate + 0.5);
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len48 = (int) (len * 4800.0 / sample_rate + 0.5);
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len96 = (int) (len * 9600.0 / sample_rate + 0.5);
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for (i = 0; i < len25; i++) {
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inc_buf(&bufpos25);
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buf25[bufpos25] = 0x30 + bit; // Ascii
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header_found = compare(buf25, dfm_header, bufpos25) * DFM;
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if (header_found) goto ende;
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}
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for (i = 0; i < len48; i++) {
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inc_buf(&bufpos48);
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buf48[bufpos48] = 0x30 + bit; // Ascii
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header_found = compare(buf48, rs41_header+16, bufpos48) * RS41;
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if (header_found) goto ende;
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header_found = compare(buf48, rs92_header, bufpos48) * RS92;
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if (header_found) goto ende;
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}
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for (i = 0; i < len96; i++) {
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inc_buf(&bufpos96);
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buf96[bufpos96] = 0x30 + bit; // Ascii
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header_found = compare(buf96, m10_header, bufpos96) * M10;
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if (header_found) {
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if (option_b) {
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// rs41-preamble similar to m10-preamble; diffs:
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// - iq: modulation-index rs41 < m10
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// - pulse-shaping
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// m10: 00110011 at 9600 bps
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// rs41: 0101 at 4800 bps
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// - m10 top-carrier
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// - m10-header ..110(1)0110011()011.. bit shuffle
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float spb = sample_rate/9600.0;
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char hdr[HEADLEN+1];
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unsigned long mvp = sample_count - (HEADLEN+len96-1-i)*spb - 1;
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int j;
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for (j = 0; j < HEADLEN; j++) hdr[j] = buf96[(bufpos96+1+j)%HEADLEN]; hdr[HEADLEN] = '\0';
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herrs = bufscmp(hdr, HEADLEN, mvp, spb);
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if (herrs < 3) goto ende; // threshold: max errors 2nd pass
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}
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else goto ende;
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}
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header_found = compare(buf96, imet_header+32, bufpos96) * iMet;
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if (header_found) goto ende;
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}
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if (zeit > 0 && sample_count > zeit*sample_rate) goto ende;
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}
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ende:
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fclose(fp);
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if (option_b) {
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if (bufb) { free(bufb); bufb = NULL; }
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if (bufs) { free(bufs); bufs = NULL; }
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}
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if (!option_silent) {
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printf("sample: %lu\n", sample_count);
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if (zeit) printf("%ds = %d samples\n", zeit, zeit*sample_rate);
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printf("found: ");
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if (!header_found) printf("NO");
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else {
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time(&rawtime);
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gmt = gmtime(&rawtime);
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if (header_found < 0) printf("-");
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if (header_found*header_found == DFM*DFM) printf("DFM");
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if (header_found*header_found == RS41*RS41) printf("RS41");
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if (header_found*header_found == RS92*RS92) printf("RS92");
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if (header_found*header_found == M10*M10) {
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printf("M10");
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if (option_b) printf(" (%d)", herrs);
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}
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if (header_found*header_found == iMet*iMet) printf("iMet");
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if (option_gmt) {
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printf(" (%4d-%02d-%02d %02d:%02dZ) ", gmt->tm_year+1900, gmt->tm_mon,
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gmt->tm_mday, gmt->tm_hour, gmt->tm_min);
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}
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}
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printf("\n");
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}
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return header_found;
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}
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