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radiosonde_auto_rx
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radiosonde_auto_rx/scan/rs_detect.c

346 wiersze
8.8 KiB
C
Czysty Bezpośredni odnośnik Wina Historia

/*
* detect/identify radiosondes
* DFM, RS92-SGP, RS41, M10, iMet-1-AB
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#ifdef CYGWIN
#include <fcntl.h> // cygwin: _setmode()
#include <io.h>
#endif
typedef unsigned char ui8_t;
typedef unsigned int ui32_t;
time_t rawtime;
struct tm *gmt;
int wavloaded = 0,
option_gmt = 0,
option_silent = 0;
#define DFM 2
#define RS41 3
#define RS92 4
#define M10 5
#define iMet 6
#define HEADLEN 32
#define HEADOFS 0 // HEADLEN+HEADOFS=32
//int dfm_baudrate = 2500;
char dfm_header[] = "01100101011001101010010110101010";
//int vai_baudrate = 4800;
char rs41_header[] = "00001000011011010101001110001000"
"01000100011010010100100000011111";
char rs92_header[] = "10100110011001101001"
"10100110011001101001"
"10100110011001101001"
"10100110011001101001"
"1010011001100110100110101010100110101001";
//int m10_baudrate = 9600;
char m10_header[] = "00110011001100110101100110110011";
//int imet_baudrate = 9600;
char imet_header[] = "11110000111100001111000011110000"
"11110000""10101100110010101100101010101100"
"11110000""10101100110010101100101010101100";
char buf25[HEADLEN+1] = "x";
int bufpos25 = -1;
char buf48[HEADLEN+1] = "x";
int bufpos48 = -1;
char buf96[HEADLEN+1] = "x";
int bufpos96 = -1;
/* -------------------------------------------------------------------------- */
int sample_rate = 0, bits_sample = 0, channels = 0;
int findstr(char *buff, char *str, int pos) {
int i;
for (i = 0; i < 4; i++) {
if (buff[(pos+i)%4] != str[i]) break;
}
return i;
}
int read_wav_header(FILE *fp) {
char txt[4+1] = "\0\0\0\0";
unsigned char dat[4];
int byte, p=0;
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "RIFF", 4)) return -1;
if (fread(txt, 1, 4, fp) < 4) return -1;
// pos_WAVE = 8L
if (fread(txt, 1, 4, fp) < 4) return -1;
if (strncmp(txt, "WAVE", 4)) return -1;
// pos_fmt = 12L
for ( ; ; ) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
txt[p % 4] = byte;
p++; if (p==4) p=0;
if (findstr(txt, "fmt ", p) == 4) break;
}
if (fread(dat, 1, 4, fp) < 4) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
channels = dat[0] + (dat[1] << 8);
if (fread(dat, 1, 4, fp) < 4) return -1;
memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24);
if (fread(dat, 1, 4, fp) < 4) return -1;
if (fread(dat, 1, 2, fp) < 2) return -1;
//byte = dat[0] + (dat[1] << 8);
if (fread(dat, 1, 2, fp) < 2) return -1;
bits_sample = dat[0] + (dat[1] << 8);
// pos_dat = 36L + info
for ( ; ; ) {
if ( (byte=fgetc(fp)) == EOF ) return -1;
txt[p % 4] = byte;
p++; if (p==4) p=0;
if (findstr(txt, "data", p) == 4) break;
}
if (fread(dat, 1, 4, fp) < 4) return -1;
if (!option_silent) {
fprintf(stderr, "sample_rate: %d\n", sample_rate);
fprintf(stderr, "bits : %d\n", bits_sample);
fprintf(stderr, "channels : %d\n", channels);
}
if ((bits_sample != 8) && (bits_sample != 16)) return -1;
return 0;
}
#define EOF_INT 0x1000000
int read_signed_sample(FILE *fp) { // int = i32_t
int byte, i, ret; // EOF -> 0x1000000
for (i = 0; i < channels; i++) {
// i = 0: links bzw. mono
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == 0) ret = byte;
if (bits_sample == 16) {
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == 0) ret += byte << 8;
}
}
if (bits_sample == 8) return ret-128;
if (bits_sample == 16) return (short)ret;
return ret;
}
int par=1, par_alt=1;
unsigned long sample_count = 0;
int read_bits_fsk(FILE *fp, int *bit, int *len) {
int n, sample;
n = 0;
do{
sample = read_signed_sample(fp);
if (sample == EOF_INT) return EOF;
sample_count++;
par_alt = par;
par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
n++;
} while (par*par_alt > 0);
*len = n;
*bit = (1+par_alt)/2; // oben 1, unten -1
//*bit = (1-par_alt)/2;// sdr#<rev1381?, invers: unten 1, oben -1
return 0;
}
/* -------------------------------------------------------------------------- */
char inv(char c) {
if (c == '0') return '1';
if (c == '1') return '0';
return c;
}
void inc_buf(int *bufpos) {
*bufpos = (*bufpos+1) % HEADLEN;
}
int compare(char buf[], char header[], int bufpos) {
int i, j;
i = 0;
j = bufpos;
while (i < HEADLEN) {
if (j < 0) j = HEADLEN-1;
if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break;
j--;
i++;
}
if (i == HEADLEN) return 1;
i = 0;
j = bufpos;
while (i < HEADLEN) {
if (j < 0) j = HEADLEN-1;
if (buf[j] != inv(header[HEADOFS+HEADLEN-1-i])) break;
j--;
i++;
}
if (i == HEADLEN) return -1;
return 0;
}
/* -------------------------------------------------------------------------- */
int main(int argc, char **argv) {
FILE *fp;
char *fpname;
int header_found, bit, len, i;
int len25, len48, len96;
int zeit = 0;
#ifdef CYGWIN
_setmode(fileno(stdin), _O_BINARY); // _setmode(_fileno(stdin), _O_BINARY);
setbuf(stdout, NULL);
#endif
fpname = argv[0];
++argv;
while ((*argv) && (!wavloaded)) {
if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
fprintf(stderr, "%s [-t nn] audio.wav\n", fpname);
return 0;
}
else if ( (strcmp(*argv, "-s") == 0) || (strcmp(*argv, "--silent") == 0) ) {
option_silent = 1;
}
else if ( (strcmp(*argv, "-z") == 0) || (strcmp(*argv, "--zulu") == 0) ) {
option_gmt = 1;
}
else if ( (strcmp(*argv, "-t") == 0) || (strcmp(*argv, "--time") == 0) ) {
++argv;
if (*argv) zeit = atoi(*argv);
else return -1;
}
else {
fp = fopen(*argv, "rb");
if (fp == NULL) {
fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
return -1;
}
wavloaded = 1;
}
++argv;
}
if (!wavloaded) fp = stdin;
i = read_wav_header(fp);
if (i) {
fclose(fp);
return -1;
}
header_found = 0;
while (!read_bits_fsk(fp, &bit, &len) && !header_found) {
len25 = (int) (len * 2500.0 / sample_rate + 0.5);
len48 = (int) (len * 4800.0 / sample_rate + 0.5);
len96 = (int) (len * 9600.0 / sample_rate + 0.5);
for (i = 0; i < len25; i++) {
inc_buf(&bufpos25);
buf25[bufpos25] = 0x30 + bit; // Ascii
header_found = compare(buf25, dfm_header, bufpos25) * DFM;
if (header_found) goto ende;
}
for (i = 0; i < len48; i++) {
inc_buf(&bufpos48);
buf48[bufpos48] = 0x30 + bit; // Ascii
header_found = compare(buf48, rs41_header+16, bufpos48) * RS41;
if (header_found) goto ende;
header_found = compare(buf48, rs92_header, bufpos48) * RS92;
if (header_found) goto ende;
}
for (i = 0; i < len96; i++) {
inc_buf(&bufpos96);
buf96[bufpos96] = 0x30 + bit; // Ascii
header_found = compare(buf96, m10_header, bufpos96) * M10;
if (header_found) goto ende;
header_found = compare(buf96, imet_header+32, bufpos96) * iMet;
if (header_found) goto ende;
}
if (zeit > 0 && sample_count > zeit*sample_rate) goto ende;
}
ende:
fclose(fp);
if (!option_silent) {
printf("sample: %lu\n", sample_count);
if (zeit) printf("%ds = %d samples\n", zeit, zeit*sample_rate);
printf("found: ");
if (!header_found) printf("NO");
else {
time(&rawtime);
gmt = gmtime(&rawtime);
if (header_found < 0) printf("-");
if (header_found*header_found == DFM*DFM) printf("DFM");
if (header_found*header_found == RS41*RS41) printf("RS41");
if (header_found*header_found == RS92*RS92) printf("RS92");
if (header_found*header_found == M10*M10) printf("M10");
if (header_found*header_found == iMet*iMet) printf("iMet");
if (option_gmt) {
printf(" (%4d-%02d-%02d %02d:%02dZ) ", gmt->tm_year+1900, gmt->tm_mon,
gmt->tm_mday, gmt->tm_hour, gmt->tm_min);
}
}
printf("\n");
}
return header_found;
}
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