kopia lustrzana https://github.com/rs1729/RS
480 wiersze
12 KiB
C
480 wiersze
12 KiB
C
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/*
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UAII2022 Lindenberg
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2022-08-11 13:30Z
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405000 kHz
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Vikram PS-B3 ?
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*/
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#include <stdio.h>
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#include <string.h>
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typedef unsigned char ui8_t;
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typedef short i16_t;
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typedef unsigned int ui32_t;
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int option_raw = 0,
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option_inv = 0,
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option_b = 0,
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option_timestamp = 0,
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wavloaded = 0;
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int wav_channel = 0; // audio channel: left
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#define BAUD_RATE 770
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#define HEADLEN 32
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#define HEADOFS 0
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char header[] = "10101010100101101001100101100101";
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char buf[HEADLEN+1] = "xxxxxxxxxx\0";
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int bufpos = 0;
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#define FRAMELEN (48)
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#define BITFRAMELEN (FRAMELEN*8)
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#define RAWBITFRAMELEN (2*BITFRAMELEN)
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char rawbits[RAWBITFRAMELEN+128];
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char bits[BITFRAMELEN+64];
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ui8_t frame[FRAMELEN+8];
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int sample_rate = 0, bits_sample = 0, channels = 0;
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float samples_per_bit = 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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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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if ((bits_sample != 8) && (bits_sample != 16)) return -1;
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samples_per_bit = sample_rate/(float)BAUD_RATE;
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fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit);
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return 0;
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}
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#define EOF_INT 0x1000000
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unsigned long sample_count = 0;
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double bitgrenze = 0;
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int read_signed_sample(FILE *fp) { // int = i32_t
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int byte, i, sample=0, s=0; // EOF -> 0x1000000
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for (i = 0; i < channels; i++) {
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// i = 0: links bzw. mono
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byte = fgetc(fp);
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if (byte == EOF) return EOF_INT;
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if (i == wav_channel) sample = byte;
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if (bits_sample == 16) {
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byte = fgetc(fp);
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if (byte == EOF) return EOF_INT;
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if (i == wav_channel) sample += byte << 8;
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}
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}
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if (bits_sample == 8) s = sample-128; // 8bit: 00..FF, centerpoint 0x80=128
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if (bits_sample == 16) s = (short)sample;
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sample_count++;
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return s;
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}
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int par=1, par_alt=1;
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int read_bits_fsk(FILE *fp, int *bit, int *len) {
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static int sample;
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int n, y0;
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float l, x1;
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static float x0;
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n = 0;
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do {
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y0 = sample;
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sample = read_signed_sample(fp);
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if (sample == EOF_INT) return EOF;
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//sample_count++; // in read_signed_sample()
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par_alt = par;
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par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
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n++;
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} while (par*par_alt > 0);
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l = (float)n / samples_per_bit;
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*len = (int)(l+0.5);
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if (!option_inv) *bit = (1+par_alt)/2; // oben 1, unten -1
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else *bit = (1-par_alt)/2; // sdr#<rev1381?, invers: unten 1, oben -1
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// *bit = (1+inv*par_alt)/2; // ausser inv=0
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/* Y-offset ? */
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return 0;
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}
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int bitstart = 0;
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unsigned long scount = 0;
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int read_rawbit(FILE *fp, int *bit) {
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int sample;
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int sum;
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sum = 0;
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if (bitstart) {
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scount = 0; // eigentlich scount = 1
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bitgrenze = 0; // oder bitgrenze = -1
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bitstart = 0;
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}
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bitgrenze += samples_per_bit;
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do {
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sample = read_signed_sample(fp);
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if (sample == EOF_INT) return EOF;
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//sample_count++; // in read_signed_sample()
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//par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
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sum += sample;
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scount++;
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} while (scount < bitgrenze); // n < samples_per_bit
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if (sum >= 0) *bit = 1;
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else *bit = 0;
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if (option_inv) *bit ^= 1;
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return 0;
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}
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int compare() {
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int i=0;
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while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == header[HEADLEN+HEADOFS-1-i])) {
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i++;
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}
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return i;
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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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int compare2() {
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int i=0;
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while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == inv(header[HEADLEN+HEADOFS-1-i]))) {
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i++;
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}
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return i;
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}
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// manchester1 1->10,0->01: 1.bit
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// manchester2 0->10,1->01: 2.bit
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void manchester1(char* frame_rawbits, char *frame_bits) {
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int i;
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char bit, bits[2];
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for (i = 0; i < BITFRAMELEN; i++) {
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bits[0] = frame_rawbits[2*i];
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bits[1] = frame_rawbits[2*i+1];
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if ((bits[0] == '0') && (bits[1] == '1')) bit = '0';
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else
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if ((bits[0] == '1') && (bits[1] == '0')) bit = '1';
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else bit = 'x';
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frame_bits[i] = bit;
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}
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}
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void manchester2(char* frame_rawbits, char *frame_bits) {
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int i;
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char bit, bits[2];
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for (i = 0; i < BITFRAMELEN; i++) {
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bits[0] = frame_rawbits[2*i];
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bits[1] = frame_rawbits[2*i+1];
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if ((bits[0] == '0') && (bits[1] == '1')) bit = '1';
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else
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if ((bits[0] == '1') && (bits[1] == '0')) bit = '0';
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else bit = 'x';
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frame_bits[i] = bit;
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}
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}
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int bits2bytes(char *bitstr, ui8_t *bytes) {
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int i, bit, d, byteval;
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int bitpos, bytepos;
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bitpos = 0;
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bytepos = 0;
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while (bytepos < FRAMELEN) {
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byteval = 0;
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d = 1;
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for (i = 0; i < 8; i++) {
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//bit = bitstr[bitpos+i]; /* little endian */
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bit = bitstr[bitpos+7-i]; /* big endian */
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if (bit == '1') byteval += d;
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else /*if ((bit == '0') */ byteval += 0;
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d <<= 1;
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}
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bitpos += 8;
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bytes[bytepos++] = byteval;
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}
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//while (bytepos < FRAME_LEN) bytes[bytepos++] = 0;
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return 0;
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}
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int dechex(ui8_t b) { // sign ?
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return ((b>>4) & 0xF)*10 + (b & 0xF);
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}
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int print_frame() {
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manchester1(rawbits, bits);
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bits2bytes(bits, frame);
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if (option_raw) {
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if (option_raw == 1) {
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for (int j = 0; j < FRAMELEN; j++) {
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printf("%02X ", frame[j]);
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}
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}
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else {
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printf("%s", bits);
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/*
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for (j = 0; j < BITFRAMELEN; j++) {
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printf("%c", bits[j]);
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if (j % 8 == 7) printf(" ");
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}
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*/
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}
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printf("\n");
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}
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else
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{
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ui32_t count;
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count = (frame[4]<<8) | frame[5];
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printf("[%5d] ", count);
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// date? (binary-coded decimal (BCD))
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ui8_t yy = frame[22]; // ? year
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ui8_t mm = ((frame[16]&0xF)<<4) | ((frame[17]>>4)&0xF); // ? month
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ui8_t dd = frame[20]; // day
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printf(" 20%02X-%02X-%02X ", yy, mm, dd);
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// time (binary-coded decimal (BCD))
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ui8_t hrs = dechex(frame[23]);
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ui8_t min = dechex(frame[24]);
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ui8_t sec = dechex(frame[25]);
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printf(" %02X:%02X:%02X ", frame[23], frame[24], frame[25]); // UTC
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// lat
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int lat_deg = dechex(frame[26]); // sign ?
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ui8_t lat_min1 = dechex(frame[27]);
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ui8_t lat_min2 = dechex(frame[28]);
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ui8_t lat_min3 = dechex(frame[29]);
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float lat = lat_deg + (lat_min1 + lat_min2*1e-2f + lat_min3*1e-4f) / 60.0f;
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printf(" lat: %.4f ", lat);
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// lon
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int lon_deg = dechex(frame[30])*10 + dechex(frame[31]>>4); // sign ?
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ui8_t lon_min1 = dechex( ((frame[31]&0xF)<<4) | ((frame[32]>>4)&0xF) );
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ui8_t lon_min2 = dechex( ((frame[32]&0xF)<<4) | ((frame[33]>>4)&0xF) );
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ui8_t lon_min3 = dechex( ((frame[33]&0xF)<<4) | ((frame[34]>>4)&0xF) );
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float lon = lon_deg + (lon_min1 + lon_min2*1e-2f + lon_min3*1e-4f) / 60.0f;
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printf(" lon: %.4f ", lon);
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//frame[35]
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// alt
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int alt1 = dechex(frame[36]);
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ui8_t alt2 = dechex(frame[37]);
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ui8_t alt3 = dechex(frame[38]);
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float alt = (alt1*1e4f + alt2*1e2f + alt3) / 10.0f; // MSL
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printf(" alt: %.1f ", alt);
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printf("\n");
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}
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return 0;
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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 ofs, i, j, h, h2, bit, len, abw;
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int bit_count, frame_count;
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int header_found = 0;
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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 [options] audio.wav\n", fpname);
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fprintf(stderr, " options:\n");
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fprintf(stderr, " -i\n");
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fprintf(stderr, " -b\n");
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return 0;
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}
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else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
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option_inv = 1;
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}
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else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
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option_raw = 1;
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}
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else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
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option_raw = 2;
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}
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else if (strcmp(*argv, "-b" ) == 0) { option_b = 1; }
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else if (strcmp(*argv, "-t" ) == 0) { option_timestamp = 1; }
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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) return -1;
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bit_count = 0;
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frame_count = 0;
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while (!read_bits_fsk(fp, &bit, &len)) {
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if (len == 0) {
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bufpos--;
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if (bufpos < 0) bufpos = HEADLEN-1;
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buf[bufpos] = 'x';
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continue;
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}
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for (j = 0; j < len; j++) {
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bufpos--;
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if (bufpos < 0) bufpos = HEADLEN-1;
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buf[bufpos] = 0x30 + bit;
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if (!header_found)
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{
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h = compare(); //h2 = compare2();
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if ((h >= HEADLEN)) {
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header_found = 1;
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fflush(stdout);
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if (option_timestamp) printf("<%8.3f> ", sample_count/(double)sample_rate);
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strncpy(rawbits, header, HEADLEN);
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bit_count += HEADLEN;
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frame_count++;
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}
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}
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else
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{
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rawbits[bit_count] = 0x30 + bit;
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bit_count += 1;
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}
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if (bit_count >= RAWBITFRAMELEN) {
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bit_count = 0;
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header_found = 0;
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print_frame();
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}
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}
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if (header_found && option_b && 0) {
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bitstart = 1;
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while ( bit_count < RAWBITFRAMELEN ) {
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if (read_rawbit(fp, &bit) == EOF) break;
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rawbits[bit_count] = 0x30 + bit;
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bit_count += 1;
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}
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bit_count = 0;
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header_found = 0;
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print_frame();
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}
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}
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printf("\n");
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fclose(fp);
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return 0;
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}
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