kopia lustrzana https://github.com/projecthorus/radiosonde_auto_rx
617 wiersze
16 KiB
C
617 wiersze
16 KiB
C
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/*
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* iMet-1-RS
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* Bell202 8N1
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* (empfohlen: sample rate 48kHz)
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*/
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#include <stdio.h>
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#include <string.h>
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#include <complex.h>
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#include <math.h>
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typedef unsigned char ui8_t;
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int option_verbose = 0, // ausfuehrliche Anzeige
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option_raw = 0, // rohe Frames
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option_rawbits = 0,
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option_dft = 0,
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wavloaded = 0;
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// Bell202, 1200 baud (1200Hz/2200Hz), 8N1
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#define BAUD_RATE 1200
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/* ------------------------------------------------------------------------------------ */
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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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int read_signed_sample(FILE *fp) { // int = i32_t
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int byte, i, ret; // 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 == 0) ret = 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 == 0) ret += byte << 8;
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}
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}
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if (bits_sample == 8) return ret-128;
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if (bits_sample == 16) return (short)ret;
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return ret;
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}
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/* ------------------------------------------------------------------------------------ */
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#define LOG2N 7 // 2^7 = 128 = N
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#define N 128 // 128 Vielfaches von 22 oder 10 unten
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#define WLEN 80 // (2*(48000/BAUDRATE))
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#define BITS (10)
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#define LEN_BITFRAME BAUD_RATE
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#define LEN_BYTEFRAME (LEN_BITFRAME/BITS)
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#define HEADLEN 30
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char header[] = "1111111111111111111""10""10000000""1";
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char buf[HEADLEN+1] = "x";
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int bufpos = -1;
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int bitpos;
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ui8_t bitframe[LEN_BITFRAME+1] = { 0, 1, 0, 0, 0, 0, 0, 0, 0, 1};
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ui8_t byteframe[LEN_BYTEFRAME+1];
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double x[N];
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double complex Z[N], w[N], expw[N][N], ew[N*N];
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int ptr;
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double Hann[N], buffer[N+1], xn[N];
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void init_dft() {
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int i, k, n;
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for (i = 0; i < N; i++) Hann[i] = 0;
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for (i = 0; i < WLEN; i++) Hann[i] = 0.5 * (1 - cos( 2 * M_PI * i / (double)(WLEN-1) ) );
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//Hann[i+(N-1-WLEN)/2] = 0.5 * (1 - cos( 2 * M_PI * i / (double)(WLEN-1) ) );
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for (k = 0; k < N; k++) {
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w[k] = -I*2*M_PI * k / (double)N;
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for (n = 0; n < N; n++) {
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expw[k][n] = cexp( w[k] * n );
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ew[k*n] = expw[k][n];
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}
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}
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}
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double dft_k(int k) {
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int n;
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double complex Zk;
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Zk = 0;
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for (n = 0; n < N; n++) {
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Zk += xn[n] * ew[k*n];
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}
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return cabs(Zk);
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}
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void dft() {
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int k, n;
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for (k = 0; k < N/2; k++) { // xn reell, brauche nur N/2 unten
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Z[k] = 0;
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for (n = 0; n < N; n++) {
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Z[k] += xn[n] * ew[k*n];
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}
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}
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}
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void dft2() {
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int s, l, l2, i, j, k;
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double complex w1, w2, T;
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for (i = 0; i < N; i++) {
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Z[i] = (double complex)xn[i];
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}
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j = 1;
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for (i = 1; i < N; i++) {
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if (i < j) {
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T = Z[j-1];
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Z[j-1] = Z[i-1];
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Z[i-1] = T;
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}
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k = N/2;
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while (k < j) {
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j = j - k;
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k = k/2;
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}
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j = j + k;
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}
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for (s = 0; s < LOG2N; s++) {
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l2 = 1 << s;
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l = l2 << 1;
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w1 = (double complex)1.0;
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w2 = cexp(-I*M_PI/(double)l2);
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for (j = 1; j <= l2; j++) {
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for (i = j; i <= N; i += l) {
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k = i + l2;
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T = Z[k-1] * w1;
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Z[k-1] = Z[i-1] - T;
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Z[i-1] = Z[i-1] + T;
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}
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w1 = w1 * w2;
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}
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}
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}
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int max_bin() {
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int k, kmax;
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double max;
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max = 0; kmax = 0;
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for (k = 0; k < N/2-1; k++) {
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if (cabs(Z[k]) > max) {
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max = cabs(Z[k]);
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kmax = k;
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}
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}
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return kmax;
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}
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double freq2bin(int f) {
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return f * N / (double)sample_rate;
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}
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int bin2freq(int k) {
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return sample_rate * k / N;
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}
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/* ------------------------------------------------------------------------------------ */
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void inc_bufpos() {
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bufpos = (bufpos+1) % HEADLEN;
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}
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int compare() {
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int i=0, 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[HEADLEN-1-i]) break;
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j--;
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i++;
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}
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return i;
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}
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int bits2byte(ui8_t *bits) {
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int i, d = 1, byte = 0;
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if ( bits[0]+bits[1]+bits[2]+bits[3]+bits[4] // 1 11111111 1 (sync)
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+bits[5]+bits[6]+bits[7]+bits[8]+bits[9] == 10 ) return 0xFFFF;
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for (i = 1; i < BITS-1; i++) { // little endian
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if (bits[i] == 1) byte += d;
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else if (bits[i] == 0) byte += 0;
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d <<= 1;
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}
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return byte & 0xFF;
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}
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int bits2bytes(ui8_t *bits, ui8_t *bytes, int len) {
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int i;
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int byte;
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for (i = 0; i < len; i++) {
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byte = bits2byte(bits+BITS*i);
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bytes[i] = byte & 0xFF;
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if (byte == 0xFFFF) break;
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}
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return i;
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}
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void print_rawbits(int len) {
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int i;
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for (i = 0; i < len; i++) {
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if ((i % BITS == 1) || (i % BITS == BITS-1)) fprintf(stdout, " ");
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fprintf(stdout, "%d", bitframe[i]);
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}
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fprintf(stdout, "\n");
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}
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/* -------------------------------------------------------------------------- */
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int crc16poly = 0x1021; // CRC16-CCITT
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int crc16(ui8_t bytes[], int len) {
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int rem = 0x1D0F; // initial value
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int i, j;
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for (i = 0; i < len; i++) {
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rem = rem ^ (bytes[i] << 8);
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for (j = 0; j < 8; j++) {
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if (rem & 0x8000) {
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rem = (rem << 1) ^ crc16poly;
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}
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else {
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rem = (rem << 1);
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}
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rem &= 0xFFFF;
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}
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}
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return rem;
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}
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/* -------------------------------------------------------------------------- */
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#define LEN_GPSePTU (18+20)
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/*
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GPS Data Packet
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offset bytes description
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0 1 SOH = 0x01
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1 1 PKT_ID = 0x02
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2 4 Latitude, +/- deg (float)
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6 4 Longitude, +/- deg (float)
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10 2 Altitude, meters (Alt = n-5000)
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12 1 nSat (0 - 12)
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13 3 Time (hr,min,sec)
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16 2 CRC (16-bit)
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packet size = 18 bytes
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*/
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#define pos_GPSlat 0x02 // 4 byte float
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#define pos_GPSlon 0x06 // 4 byte float
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#define pos_GPSalt 0x0A // 2 byte int
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#define pos_GPStim 0x0D // 3 byte
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#define pos_GPScrc 0x10 // 2 byte
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void print_GPS(int pos) {
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float lat, lon;
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int alt;
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int std, min, sek;
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int crc1, crc2;
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crc1 = ((byteframe+pos)[pos_GPScrc] << 8) | (byteframe+pos)[pos_GPScrc+1];
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crc2 = crc16(byteframe+pos, pos_GPScrc); // len=pos
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lat = *(float*)(byteframe+pos+pos_GPSlat);
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lon = *(float*)(byteframe+pos+pos_GPSlon);
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alt = ((byteframe+pos)[pos_GPSalt+1]<<8)+(byteframe+pos)[pos_GPSalt] - 5000;
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std = (byteframe+pos)[pos_GPStim+0];
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min = (byteframe+pos)[pos_GPStim+1];
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sek = (byteframe+pos)[pos_GPStim+2];
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fprintf(stdout, "(%02d:%02d:%02d) ", std, min, sek);
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fprintf(stdout, " lat: %.6f° ", lat);
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fprintf(stdout, " lon: %.6f° ", lon);
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fprintf(stdout, " alt: %dm ", alt);
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fprintf(stdout, " # ");
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fprintf(stdout, " CRC: %04X ", crc1);
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fprintf(stdout, "- %04X ", crc2);
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if (crc1 == crc2) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
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}
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/*
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PTU (enhanced) Data Packet
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offset bytes description
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0 1 SOH = 0x01
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1 1 PKT_ID = 0x04
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2 2 PKT = packet number
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4 3 P, mbs (P = n/100)
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7 2 T, °C (T = n/100)
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9 2 U, % (U = n/100)
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11 1 Vbat, V (V = n/10)
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12 2 Tint, °C (Tint = n/100)
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14 2 Tpr, °C (Tpr = n/100)
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16 2 Tu, °C (Tu = n/100)
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18 2 CRC (16-bit)
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packet size = 20 bytes
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*/
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#define pos_PCKnum 0x02 // 2 byte
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#define pos_PTUprs 0x04 // 3 byte
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#define pos_PTUtem 0x07 // 2 byte int
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#define pos_PTUhum 0x09 // 2 byte
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#define pos_PTUbat 0x0B // 1 byte
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#define pos_PTUcrc 0x12 // 2 byte
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void print_ePTU(int pos) {
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int P, U;
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short T;
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int bat, pcknum;
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int crc1, crc2;
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crc1 = ((byteframe+pos)[pos_PTUcrc] << 8) | (byteframe+pos)[pos_PTUcrc+1];
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crc2 = crc16(byteframe+pos, pos_PTUcrc); // len=pos
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P = (byteframe+pos)[pos_PTUprs] | ((byteframe+pos)[pos_PTUprs+1]<<8) | ((byteframe+pos)[pos_PTUprs+2]<<16);
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T = (byteframe+pos)[pos_PTUtem] | ((byteframe+pos)[pos_PTUtem+1]<<8);
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U = (byteframe+pos)[pos_PTUhum] | ((byteframe+pos)[pos_PTUhum+1]<<8);
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bat = (byteframe+pos)[pos_PTUbat];
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pcknum = (byteframe+pos)[pos_PCKnum] | ((byteframe+pos)[pos_PCKnum+1]<<8);
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fprintf(stdout, "[%d] ", pcknum);
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fprintf(stdout, " P:%.2fmb ", P/100.0);
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fprintf(stdout, " T:%.2f°C ", T/100.0);
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fprintf(stdout, " U:%.2f%% ", U/100.0);
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fprintf(stdout, " bat:%.1fV ", bat/10.0);
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fprintf(stdout, " # ");
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fprintf(stdout, " CRC: %04X ", crc1);
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fprintf(stdout, "- %04X ", crc2);
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if (crc1 == crc2) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
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}
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/* -------------------------------------------------------------------------- */
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int print_frame(int len) {
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int i;
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int framelen;
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if ( len < 2 || len > LEN_BYTEFRAME) return -1;
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for (i = len; i < LEN_BYTEFRAME; i++) byteframe[i] = 0;
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if (option_rawbits)
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{
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print_rawbits((LEN_GPSePTU+2)*BITS);
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}
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else
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{
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framelen = bits2bytes(bitframe, byteframe, len);
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if (option_raw) {
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for (i = 0; i < framelen; i++) { // LEN_GPSePTU
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fprintf(stdout, "%02X ", byteframe[i]);
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}
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fprintf(stdout, "\n");
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}
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//else
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{
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if ((byteframe[0] == 0x01) && (byteframe[1] == 0x02)) { // GPS Data Packet
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print_GPS(0x00); // packet offset in byteframe
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fprintf(stdout, "\n");
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}
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if ((byteframe[pos_GPScrc+2+0] == 0x01) && (byteframe[pos_GPScrc+2+1] == 0x04)) { // PTU Data Packet
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print_ePTU(pos_GPScrc+2); // packet offset in byteframe
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fprintf(stdout, "\n");
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}
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/*
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if ((byteframe[0] == 0x01) && (byteframe[1] == 0x04)) { // PTU Data Packet
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print_ePTU(0x00); // packet offset in byteframe
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fprintf(stdout, "\n");
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}
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*/
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fprintf(stdout, "\n");
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}
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}
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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 sample;
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unsigned int sample_count;
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int i, j, kmax, k0, k1;
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int bit = 8, bit0 = 8;
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int pos = 0, pos0 = 0;
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int header_found = 0;
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int bitlen; // sample_rate/BAUD_RATE
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int len;
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double k_f0, k_f1, k_df;
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double cb0, cb1;
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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, " -v, --verbose\n");
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fprintf(stderr, " -r, --raw\n");
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return 0;
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|
}
|
|
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
|
|
option_verbose = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
|
|
option_raw = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "--rawbits") == 0) ) {
|
|
option_rawbits = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "-d1") == 0) || (strcmp(*argv, "--dft1") == 0) ) {
|
|
option_dft = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "-d2") == 0) || (strcmp(*argv, "--dft2") == 0) ) {
|
|
option_dft = 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) {
|
|
fclose(fp);
|
|
return -1;
|
|
}
|
|
|
|
|
|
bitlen = sample_rate/BAUD_RATE;
|
|
k_f0 = freq2bin(2200); // bit0: 2200Hz
|
|
k_f1 = freq2bin(1200); // bit1: 1200Hz
|
|
k_df = fabs(k_f0-k_f1)/2.5;
|
|
k0 = (int)(k_f0+.5);
|
|
k1 = (int)(k_f1+.5);
|
|
|
|
init_dft();
|
|
|
|
ptr = -1; sample_count = -1;
|
|
while ((sample=read_signed_sample(fp)) < EOF_INT) {
|
|
|
|
ptr++;
|
|
sample_count++;
|
|
if (ptr == N) ptr = 0;
|
|
buffer[ptr] = sample / (double)(1<<bits_sample);
|
|
|
|
if (sample_count < N) continue;
|
|
|
|
|
|
for (j = 0; j < N; j++) {
|
|
xn[j] = Hann[j]*buffer[(ptr + j + 1)%N];
|
|
}
|
|
|
|
if (option_dft) {
|
|
if (option_dft == 2) dft2();
|
|
else dft();
|
|
kmax = max_bin();
|
|
if (kmax > k_f0-k_df && kmax < k_f0+k_df) bit = 0; // kmax = freq2bin(2200): 2200Hz
|
|
else if (kmax > k_f1-k_df && kmax < k_f1+k_df) bit = 1; // kmax = freq2bin(1200): 1200Hz
|
|
}
|
|
else {
|
|
cb0 = dft_k(k0);
|
|
cb1 = dft_k(k1);
|
|
if ( cb0 > cb1 ) bit = 0; // freq2bin(2200): 2200Hz
|
|
else bit = 1; // freq2bin(1200): 1200Hz
|
|
}
|
|
|
|
if (bit != bit0) {
|
|
|
|
pos0 = pos;
|
|
pos = sample_count; //sample_count-(N-1)/2
|
|
|
|
len = (pos-pos0+bitlen/2)/bitlen; //(pos-pos0)/bitlen + 0.5;
|
|
for (i = 0; i < len; i++) {
|
|
inc_bufpos();
|
|
buf[bufpos] = 0x30 + bit0;
|
|
|
|
if (!header_found) {
|
|
if (compare() >= HEADLEN) {
|
|
header_found = 1;
|
|
bitpos = 10;
|
|
}
|
|
}
|
|
else {
|
|
bitframe[bitpos] = bit0;
|
|
bitpos++;
|
|
if (bitpos >= LEN_BITFRAME-200) { // LEN_GPSePTU*BITS+40
|
|
|
|
print_frame(bitpos/BITS);
|
|
|
|
bitpos = 0;
|
|
header_found = 0;
|
|
}
|
|
}
|
|
}
|
|
bit0 = bit;
|
|
}
|
|
|
|
}
|
|
fprintf(stdout, "\n");
|
|
|
|
fclose(fp);
|
|
|
|
return 0;
|
|
}
|
|
|