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RS-tracker/meteosis/meteosis.c

429 wiersze
10 KiB
C
Czysty Bezpośredni odnośnik Wina Historia

/*
Meteosis MTS01 ?
*/
#include <stdio.h>
#include <string.h>
typedef unsigned char ui8_t;
typedef short i16_t;
typedef unsigned int ui32_t;
int option_raw = 0,
option_inv = 0,
option_b = 0,
option_timestamp = 0,
wavloaded = 0;
int wav_channel = 0; // audio channel: left
#define BAUD_RATE 1200
#define FRAMELEN 135 //148
#define BITFRAMELEN (8*FRAMELEN)
#define DATLEN 128
#define HEADLEN 32 //40
#define HEADOFS 0
char header[] = "10101010""10101010" // preamble: AA AA
"10110100""00101011"; // 10000000: B4 2B 80
char buf[HEADLEN+1] = "xxxxxxxxxx\0";
int bufpos = 0;
char frame_bits[BITFRAMELEN+80];
ui8_t frame_bytes[FRAMELEN+8];
int sample_rate = 0, bits_sample = 0, channels = 0;
float samples_per_bit = 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;
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;
samples_per_bit = sample_rate/(float)BAUD_RATE;
fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit);
return 0;
}
#define EOF_INT 0x1000000
unsigned long sample_count = 0;
double bitgrenze = 0;
int read_signed_sample(FILE *fp) { // int = i32_t
int byte, i, sample=0, s=0; // EOF -> 0x1000000
for (i = 0; i < channels; i++) {
// i = 0: links bzw. mono
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == wav_channel) sample = byte;
if (bits_sample == 16) {
byte = fgetc(fp);
if (byte == EOF) return EOF_INT;
if (i == wav_channel) sample += byte << 8;
}
}
if (bits_sample == 8) s = sample-128; // 8bit: 00..FF, centerpoint 0x80=128
if (bits_sample == 16) s = (short)sample;
sample_count++;
return s;
}
int par=1, par_alt=1;
int read_bits_fsk(FILE *fp, int *bit, int *len) {
static int sample;
int n;
float l;
n = 0;
do{
sample = read_signed_sample(fp);
if (sample == EOF_INT) return EOF;
//sample_count++; // in read_signed_sample()
par_alt = par;
par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
n++;
} while (par*par_alt > 0);
l = (float)n / samples_per_bit;
*len = (int)(l+0.5);
if (!option_inv) *bit = (1+par_alt)/2; // oben 1, unten -1
else *bit = (1-par_alt)/2; // sdr#<rev1381?, invers: unten 1, oben -1
// *bit = (1+inv*par_alt)/2; // ausser inv=0
/* Y-offset ? */
return 0;
}
int bitstart = 0;
unsigned long scount = 0;
int read_rawbit(FILE *fp, int *bit) {
int sample;
int sum;
sum = 0;
if (bitstart) {
scount = 0; // eigentlich scount = 1
bitgrenze = 0; // oder bitgrenze = -1
bitstart = 0;
}
bitgrenze += samples_per_bit;
do {
sample = read_signed_sample(fp);
if (sample == EOF_INT) return EOF;
//sample_count++; // in read_signed_sample()
//par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
sum += sample;
scount++;
} while (scount < bitgrenze); // n < samples_per_bit
if (sum >= 0) *bit = 1;
else *bit = 0;
if (option_inv) *bit ^= 1;
return 0;
}
int compare() {
int i=0;
while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == header[HEADLEN+HEADOFS-1-i])) {
i++;
}
return i;
}
char inv(char c) {
if (c == '0') return '1';
if (c == '1') return '0';
return c;
}
int compare2() {
int i=0;
while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == inv(header[HEADLEN+HEADOFS-1-i]))) {
i++;
}
return i;
}
ui32_t crc16_re(ui8_t bytes[], int len) {
ui32_t crc16poly = 0x8005; //rev(0xA001)
ui32_t rem = 0xFFFF; // init value
int i, j;
ui32_t re = 0;
for (i = 0; i < len; i++) {
rem = rem ^ (bytes[i] << 8);
for (j = 0; j < 8; j++) {
if (rem & 0x8000) {
rem = (rem << 1) ^ crc16poly;
}
else {
rem = (rem << 1);
}
rem &= 0xFFFF;
}
}
for (j = 0; j < 16; j++) {
if (rem & (1<<(15-j))) re |= (1<<j);
}
return re;
}
int bits2bytes(char *bitstr, ui8_t *bytes) {
int i, bit, d, byteval;
int bitpos, bytepos;
bitpos = 0;
bytepos = 0;
while (bytepos < FRAMELEN) {
byteval = 0;
d = 1;
for (i = 0; i < 8; i++) {
//bit = bitstr[bitpos+i]; /* little endian */
bit = bitstr[bitpos+7-i]; /* big endian */
if (bit == '1') byteval += d;
else /*if ((bit == '0') */ byteval += 0;
d <<= 1;
}
bitpos += 8;
bytes[bytepos++] = byteval;
}
//while (bytepos < FRAME_LEN) bytes[bytepos++] = 0;
return 0;
}
int OFS = 5;
int print_frame() {
int i, j;
int crcdat, crcval, crc_ok;
bits2bytes(frame_bits, frame_bytes);
// CRC
crcdat = (frame_bytes[OFS+DATLEN+1]<<8) | frame_bytes[OFS+DATLEN];
crcval = crc16_re(frame_bytes+OFS, DATLEN);
crc_ok = (crcdat == crcval);
if (option_raw) {
if (option_raw == 1) {
for (j = 0; j < FRAMELEN; j++) {
printf("%02X ", frame_bytes[j]);
}
printf(" # [%04X:%04X]", crcdat, crcval);
printf(" # [%s]", crc_ok ? "OK" : "NO");
}
else {
for (j = 0; j < BITFRAMELEN; j++) {
printf("%c", frame_bits[j]);
if (j % 8 == 7) printf(" ");
}
}
printf("\n");
}
else {
// ASCII-String:
// SN/ID?,?,counter,YYMMDDhhmmss,?,lat,lon,alt?,?,?,?,?,?,?,?,?,?,?
printf("%s", frame_bytes+OFS);
printf(" [%s]", crc_ok ? "OK" : "NO");
printf("\n");
}
return 0;
}
int main(int argc, char **argv) {
FILE *fp;
char *fpname;
int i, j, h, bit, len;
int bit_count, frames;
int header_found = 0;
fpname = argv[0];
++argv;
while ((*argv) && (!wavloaded)) {
if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
fprintf(stderr, "%s [options] audio.wav\n", fpname);
fprintf(stderr, " options:\n");
fprintf(stderr, " -i\n");
fprintf(stderr, " -b\n");
return 0;
}
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
option_inv = 1;
}
else if (strcmp(*argv, "-b" ) == 0) { option_b = 1; }
else if (strcmp(*argv, "-t" ) == 0) { option_timestamp = 1; }
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
option_raw = 1;
}
else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
option_raw = 2;
}
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) return -1;
bit_count = 0;
frames = 0;
while (!read_bits_fsk(fp, &bit, &len)) {
if (len == 0) {
bufpos--;
if (bufpos < 0) bufpos = HEADLEN-1;
buf[bufpos] = 'x';
continue;
}
for (j = 0; j < len; j++) {
bufpos--;
if (bufpos < 0) bufpos = HEADLEN-1;
buf[bufpos] = 0x30 + bit;
if (!header_found)
{
h = compare(); //h2 = compare2();
if ((h >= HEADLEN)) {
header_found = 1;
fflush(stdout);
if (option_timestamp) printf("<%8.3f> ", sample_count/(double)sample_rate);
strncpy(frame_bits, header, HEADLEN);
bit_count += HEADLEN;
frames++;
}
}
else
{
frame_bits[bit_count] = 0x30 + bit;
bit_count += 1;
}
if (bit_count >= BITFRAMELEN) {
bit_count = 0;
header_found = 0;
print_frame();
}
}
if (header_found && option_b) {
bitstart = 1;
while ( bit_count < BITFRAMELEN ) {
if (read_rawbit(fp, &bit) == EOF) break;
frame_bits[bit_count] = 0x30 + bit;
bit_count += 1;
}
bit_count = 0;
header_found = 0;
print_frame();
}
}
printf("\n");
fclose(fp);
return 0;
}
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