kopia lustrzana https://github.com/rs1729/RS
rs detect w/ correlation/DFT
Zilog80
rodzic
5f6ab9f33b
commit
cb8e143ee4
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@ -0,0 +1,727 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <complex.h>
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typedef unsigned char ui8_t;
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typedef unsigned short ui16_t;
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typedef unsigned int ui32_t;
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typedef short i16_t;
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typedef int i32_t;
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static int option_verbose = 0, // ausfuehrliche Anzeige
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option_inv = 0, // invertiert Signal
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option_dc = 0,
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wavloaded = 0;
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static int wav_channel = 0; // audio channel: left
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//int dfm_bps = 2500;
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static char dfm_header[] = "01100101011001101010010110101010";
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//int vai_bps = 4800;
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static char rs41_header[] = "00001000011011010101001110001000"
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"01000100011010010100100000011111";
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static 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 lms_bps = 4800;
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static char lms6_header[] = "0101011000001000""0001110010010111"
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"0001101010100111""0011110100111110";
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//int m10_bps = 9600;
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static char m10_header[] = "10011001100110010100110010011001";
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// frame byte[0..1]: byte[0]=framelen-1, byte[1]=type(8F=M2K2,9F=M10,AF=M10+)
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// M2K2 : 64 8F : 0110010010001111
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// M10 : 64 9F : 0110010010011111 (framelen 0x64+1)
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// M10-aux: 76 9F : 0111011010011111 (framelen 0x76+1)
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// M10+ : 64 AF : 0110010010101111 (w/ gtop-GPS)
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//int imet1ab_baudrate = 9600;
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static char imet1ab_header[] = "11110000111100001111000011110000"
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"11110000""10101100110010101100101010101100"
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"11110000""10101100110010101100101010101100";
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typedef struct {
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int bps;
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int hLen;
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int N;
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char *header;
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float spb;
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float thres;
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float complex *Fm;
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char *type;
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} rsheader_t;
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#define Nrs 6
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static rsheader_t rs_hdr[Nrs] = {
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{ 2500, 0, 0, dfm_header, 0.0, 0.60, NULL, "DFM"},
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{ 4800, 0, 0, rs41_header, 0.0, 0.70, NULL, "RS41"},
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{ 4800, 0, 0, rs92_header, 0.0, 0.70, NULL, "RS92"},
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{ 4800, 0, 0, lms6_header, 0.0, 0.70, NULL, "LMS6"},
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{ 9600, 0, 0, m10_header, 0.0, 0.76, NULL, "M10"},
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{ 9600, 0, 0, imet1ab_header, 0.0, 0.70, NULL, "IMET1AB"}
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};
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/*
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// m10-false-positive:
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// m10-preamble similar to rs41-preamble, parts of rs92/imet1ab; diffs:
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// - iq: - modulation-index rs41 < rs92 < m10,
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// - power level / frame < 1s, noise
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// - fm: - frame duration <-> noise (variance/standard deviation)
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// - pulse-shaping
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// m10: 00110011 at 9600 bps
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// rs41: 0 1 0 1 at 4800 bps
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// - m10 top-carrier, fm-mean/average
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// - m10-header ..110(1)0110011()011.. bit shuffle
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// - m10 frame byte[1]=type(M2K2,M10,M10+)
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*/
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static unsigned int sample_in, sample_out, delay;
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static int M; // N
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static float *bufs = NULL;
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static char *rawbits = NULL;
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static int Nvar = 0; // < M
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static double xsum = 0;
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static float *xs = NULL;
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/*
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static double xsum=0, qsum=0;
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static float *xs = NULL,
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*qs = NULL;
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*/
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static float dc_ofs = 0.0;
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static float dc = 0.0;
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/* ------------------------------------------------------------------------------------ */
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static int LOG2N, N_DFT;
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static float complex *ew;
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static float complex *X, *Z, *cx;
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static float *xn;
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static void dft_raw(float complex *Z) {
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int s, l, l2, i, j, k;
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float complex w1, w2, T;
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j = 1;
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for (i = 1; i < N_DFT; 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_DFT/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 = (float complex)1.0;
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w2 = ew[s]; // cexp(-I*M_PI/(float)l2)
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for (j = 1; j <= l2; j++) {
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for (i = j; i <= N_DFT; 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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static void dft(float *x, float complex *Z) {
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int i;
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for (i = 0; i < N_DFT; i++) Z[i] = (float complex)x[i];
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dft_raw(Z);
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}
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static void Nidft(float complex *Z, float complex *z) {
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int i;
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for (i = 0; i < N_DFT; i++) z[i] = conj(Z[i]);
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dft_raw(z);
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// idft():
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// for (i = 0; i < N_DFT; i++) z[i] = conj(z[i])/(float)N_DFT; // hier: z reell
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}
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/* ------------------------------------------------------------------------------------ */
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/*
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static float get_bufvar(int ofs) {
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float mu = xs[(sample_out+M + ofs) % M]/Nvar;
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float var = qs[(sample_out+M + ofs) % M]/Nvar - mu*mu;
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return var;
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}
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*/
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static float get_bufmu(int ofs) {
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float mu = xs[(sample_out+M + ofs) % M]/Nvar;
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return mu;
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}
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static int getCorrDFT(int abs, int K, unsigned int pos, float *maxv, unsigned int *maxvpos, rsheader_t rshd) {
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int i;
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int mp = -1;
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float mx = 0.0;
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double xnorm = 1;
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unsigned int mpos = 0;
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dc = 0.0;
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if (rshd.N + K > N_DFT/2 - 2) return -1;
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if (sample_in < delay+rshd.N+K) return -2;
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if (pos == 0) pos = sample_out;
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for (i = 0; i < rshd.N+K; i++) xn[i] = bufs[(pos+M -(rshd.N+K-1) + i) % M];
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while (i < N_DFT) xn[i++] = 0.0;
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dft(xn, X);
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dc = get_bufmu(pos-sample_out); //oder: dc = creal(X[0])/N_DFT;
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for (i = 0; i < N_DFT; i++) Z[i] = X[i]*rshd.Fm[i];
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Nidft(Z, cx);
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if (abs) {
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for (i = rshd.N; i < rshd.N+K; i++) {
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if (fabs(creal(cx[i])) > fabs(mx)) { // imag(cx)=0
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mx = creal(cx[i]);
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mp = i;
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}
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}
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}
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else {
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for (i = rshd.N; i < rshd.N+K; i++) {
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if (creal(cx[i]) > mx) { // imag(cx)=0
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mx = creal(cx[i]);
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mp = i;
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}
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}
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}
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if (mp == rshd.N || mp == rshd.N+K-1) return -4; // Randwert
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mpos = pos - ( rshd.N+K-1 - mp );
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//xnorm = sqrt(qs[(mpos + 2*M) % M]);
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xnorm = 0.0;
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for (i = 0; i < rshd.N; i++) xnorm += bufs[(mpos-i + M) % M]*bufs[(mpos-i + M) % M];
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xnorm = sqrt(xnorm);
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mx /= xnorm*N_DFT;
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*maxv = mx;
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*maxvpos = mpos;
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return mp;
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}
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/* ------------------------------------------------------------------------------------ */
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static int sample_rate = 0, bits_sample = 0, channels = 0;
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static int wav_ch = 0; // 0: links bzw. mono; 1: rechts
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static 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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static int read_wav_header(FILE *fp, int wav_channel) {
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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 (wav_channel >= 0 && wav_channel < channels) wav_ch = wav_channel;
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else wav_ch = 0;
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fprintf(stderr, "channel-In : %d\n", wav_ch+1);
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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 == wav_ch) { // 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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static int f32buf_sample(FILE *fp, int inv, int cm) {
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float s = 0.0;
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float xneu, xalt;
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if (f32read_sample(fp, &s) == EOF) return EOF;
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if (inv) s = -s;
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bufs[sample_in % M] = s - dc_ofs;
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xneu = bufs[(sample_in ) % M];
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xalt = bufs[(sample_in+M - Nvar) % M];
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xsum += xneu - xalt; // + xneu - xalt
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xs[sample_in % M] = xsum;
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/*
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qsum += (xneu - xalt)*(xneu + xalt); // + xneu*xneu - xalt*xalt
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qs[sample_in % M] = qsum;
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*/
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if (0 && cm) {
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// direct correlation
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}
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sample_out = sample_in - delay;
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sample_in += 1;
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return 0;
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}
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static int read_bufbit(int symlen, char *bits, unsigned int mvp, int reset, float spb) {
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// symlen==2: manchester2 0->10,1->01->1: 2.bit
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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 (symlen == 2) {
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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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}
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if (symlen != 2) {
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if (sum >= 0) *bits = '1';
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else *bits = '0';
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}
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else {
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if (sum >= 0) strncpy(bits, "10", 2);
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else strncpy(bits, "01", 2);
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}
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return 0;
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}
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static int headcmp(int symlen, char *hdr, int len, unsigned int mvp, int inv, int option_dc, float spb) {
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int errs = 0;
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int pos;
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int step = 1;
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char sign = 0;
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if (symlen != 1) step = 2;
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if (inv) sign=1;
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for (pos = 0; pos < len; pos += step) {
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read_bufbit(symlen, rawbits+pos, mvp+1-(int)(len*spb), pos==0, spb);
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}
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rawbits[pos] = '\0';
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while (len > 0) {
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if ((rawbits[len-1]^sign) != hdr[len-1]) errs += 1;
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len--;
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}
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if (option_dc && errs < 3) {
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dc_ofs += dc;
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}
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return errs;
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}
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/* -------------------------------------------------------------------------- */
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#define SQRT2 1.4142135624 // sqrt(2)
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// sigma = sqrt(log(2)) / (2*PI*BT):
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//#define SIGMA 0.2650103635 // BT=0.5: 0.2650103635 , BT=0.3: 0.4416839392
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// Gaussian FM-pulse
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static double Q(double x) {
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return 0.5 - 0.5*erf(x/SQRT2);
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}
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static double pulse(double t, double sigma) {
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return Q((t-0.5)/sigma) - Q((t+0.5)/sigma);
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}
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static double norm2_match(float *match, int n) {
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int i;
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double x, y = 0.0;
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for (i = 0; i < n; i++) {
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x = match[i];
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y += x*x;
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}
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return y;
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}
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static int init_buffers() {
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int i, j, pos;
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double t;
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double b0, b1, b2, b;
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float normMatch;
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int K, NN;
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int n, k;
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float *match = NULL;
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float *m = NULL;
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double BT = 0.5;
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double sigma = sqrt(log(2)) / (2*M_PI*BT);
|
||||
|
||||
char *bits = NULL;
|
||||
float spb = 0.0;
|
||||
|
||||
int hLen = 0;
|
||||
|
||||
for (j = 0; j < Nrs; j++) {
|
||||
rs_hdr[j].spb = sample_rate/(float)rs_hdr[j].bps;
|
||||
rs_hdr[j].hLen = strlen(rs_hdr[j].header);
|
||||
rs_hdr[j].N = rs_hdr[j].hLen * rs_hdr[j].spb + 0.5;
|
||||
if (rs_hdr[j].hLen > hLen) hLen = rs_hdr[j].hLen;
|
||||
}
|
||||
|
||||
NN = hLen * sample_rate/2500.0 + 0.5; // max(hLen*spb)
|
||||
|
||||
M = 3*NN;
|
||||
//if (samples_per_bit < 6) M = 6*N;
|
||||
|
||||
delay = NN/16;
|
||||
sample_in = 0;
|
||||
|
||||
K = M-NN - delay; // N+K < M
|
||||
|
||||
LOG2N = 2 + (int)(log(NN+K)/log(2));
|
||||
N_DFT = 1 << LOG2N;
|
||||
|
||||
while (NN + K > N_DFT/2 - 2) {
|
||||
LOG2N += 1;
|
||||
N_DFT <<= 1;
|
||||
}
|
||||
|
||||
Nvar = NN; // wenn Nvar fuer xnorm, dann Nvar=rshd.N
|
||||
|
||||
rawbits = (char *)calloc( hLen+1, sizeof(char)); if (rawbits == NULL) return -100;
|
||||
bufs = (float *)calloc( M+1, sizeof(float)); if (bufs == NULL) return -100;
|
||||
xs = (float *)calloc( M+1, sizeof(float)); if (xs == NULL) return -100;
|
||||
/*
|
||||
qs = (float *)calloc( M+1, sizeof(float)); if (qs == NULL) return -100;
|
||||
*/
|
||||
|
||||
xn = calloc(N_DFT+1, sizeof(float)); if (xn == NULL) return -1;
|
||||
|
||||
ew = calloc(LOG2N+1, sizeof(complex float)); if (ew == NULL) return -1;
|
||||
X = calloc(N_DFT+1, sizeof(complex float)); if (X == NULL) return -1;
|
||||
Z = calloc(N_DFT+1, sizeof(complex float)); if (Z == NULL) return -1;
|
||||
cx = calloc(N_DFT+1, sizeof(complex float)); if (cx == NULL) return -1;
|
||||
|
||||
for (n = 0; n < LOG2N; n++) {
|
||||
k = 1 << n;
|
||||
ew[n] = cexp(-I*M_PI/(float)k);
|
||||
}
|
||||
|
||||
match = (float *)calloc( NN+1, sizeof(float)); if (match == NULL) return -1;
|
||||
m = (float *)calloc(N_DFT+1, sizeof(float)); if (m == NULL) return -1;
|
||||
|
||||
|
||||
for (j = 0; j < Nrs; j++)
|
||||
{
|
||||
|
||||
rs_hdr[j].Fm = (float complex *)calloc(N_DFT+1, sizeof(complex float)); if (rs_hdr[j].Fm == NULL) return -1;
|
||||
bits = rs_hdr[j].header;
|
||||
spb = rs_hdr[j].spb;
|
||||
|
||||
for (i = 0; i < rs_hdr[j].N; i++) {
|
||||
|
||||
pos = i/spb;
|
||||
t = (i - pos*spb)/spb - 0.5;
|
||||
|
||||
b1 = ((bits[pos] & 0x1) - 0.5)*2.0;
|
||||
b = b1*pulse(t, sigma);
|
||||
|
||||
if (pos > 0) {
|
||||
b0 = ((bits[pos-1] & 0x1) - 0.5)*2.0;
|
||||
b += b0*pulse(t+1, sigma);
|
||||
}
|
||||
|
||||
if (pos < hLen) {
|
||||
b2 = ((bits[pos+1] & 0x1) - 0.5)*2.0;
|
||||
b += b2*pulse(t-1, sigma);
|
||||
}
|
||||
|
||||
match[i] = b;
|
||||
}
|
||||
|
||||
normMatch = sqrt(norm2_match(match, rs_hdr[j].N));
|
||||
for (i = 0; i < rs_hdr[j].N; i++) {
|
||||
match[i] /= normMatch;
|
||||
}
|
||||
|
||||
for (i = 0; i < rs_hdr[j].N; i++) m[rs_hdr[j].N-1 - i] = match[i];
|
||||
while (i < N_DFT) m[i++] = 0.0;
|
||||
dft(m, rs_hdr[j].Fm);
|
||||
|
||||
}
|
||||
|
||||
|
||||
free(match); match = NULL;
|
||||
free(m); m = NULL;
|
||||
|
||||
return K;
|
||||
}
|
||||
|
||||
static int free_buffers() {
|
||||
int j;
|
||||
|
||||
if (bufs) { free(bufs); bufs = NULL; }
|
||||
if (xs) { free(xs); xs = NULL; }
|
||||
/*
|
||||
if (qs) { free(qs); qs = NULL; }
|
||||
*/
|
||||
if (rawbits) { free(rawbits); rawbits = NULL; }
|
||||
|
||||
if (xn) { free(xn); xn = NULL; }
|
||||
if (ew) { free(ew); ew = NULL; }
|
||||
if (X) { free(X); X = NULL; }
|
||||
if (Z) { free(Z); Z = NULL; }
|
||||
if (cx) { free(cx); cx = NULL; }
|
||||
|
||||
for (j = 0; j < Nrs; j++) {
|
||||
if (rs_hdr[j].Fm) { free(rs_hdr[j].Fm); rs_hdr[j].Fm = NULL; }
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------------------------------ */
|
||||
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
|
||||
FILE *fp = NULL;
|
||||
char *fpname = NULL;
|
||||
|
||||
int j;
|
||||
int k, K;
|
||||
float mv[Nrs];
|
||||
unsigned int mv_pos[Nrs], mv0_pos[Nrs];
|
||||
int mp[Nrs];
|
||||
|
||||
int header_found = 0;
|
||||
int herrs;
|
||||
float thres = 0.76;
|
||||
|
||||
|
||||
#ifdef CYGWIN
|
||||
_setmode(fileno(stdin), _O_BINARY); // _setmode(_fileno(stdin), _O_BINARY);
|
||||
#endif
|
||||
setbuf(stdout, NULL);
|
||||
|
||||
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, " -v, --verbose\n");
|
||||
return 0;
|
||||
}
|
||||
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
|
||||
option_verbose = 1;
|
||||
}
|
||||
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
|
||||
option_inv = 1; // nicht noetig
|
||||
}
|
||||
else if ( (strcmp(*argv, "--dc") == 0) ) {
|
||||
option_dc = 1;
|
||||
}
|
||||
else if ( (strcmp(*argv, "--ch2") == 0) ) { wav_channel = 1; } // right channel (default: 0=left)
|
||||
else if ( (strcmp(*argv, "--ths") == 0) ) {
|
||||
++argv;
|
||||
if (*argv) {
|
||||
thres = atof(*argv);
|
||||
for (j = 0; j < Nrs; j++) rs_hdr[j].thres = thres;
|
||||
}
|
||||
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;
|
||||
|
||||
|
||||
j = read_wav_header(fp, wav_channel);
|
||||
if ( j < 0 ) {
|
||||
fclose(fp);
|
||||
fprintf(stderr, "error: wav header\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
K = init_buffers();
|
||||
if ( K < 0 ) {
|
||||
fprintf(stderr, "error: init buffers\n");
|
||||
return -1;
|
||||
};
|
||||
|
||||
for (j = 0; j < Nrs; j++) {
|
||||
mv[j] = -1;
|
||||
mv_pos[j] = 0;
|
||||
mp[j] = 0;
|
||||
}
|
||||
|
||||
k = 0;
|
||||
|
||||
while ( f32buf_sample(fp, option_inv, 1) != EOF ) {
|
||||
|
||||
k += 1;
|
||||
|
||||
if (k >= K-4) {
|
||||
for (j = 0; j < Nrs; j++) {
|
||||
mv0_pos[j] = mv_pos[j];
|
||||
mp[j] = getCorrDFT(-1, K, 0, mv+j, mv_pos+j, rs_hdr[j]);
|
||||
}
|
||||
k = 0;
|
||||
}
|
||||
else {
|
||||
for (j = 0; j < Nrs; j++) mv[j] = 0.0;
|
||||
continue;
|
||||
}
|
||||
|
||||
header_found = 0;
|
||||
for (j = 0; j < Nrs; j++)
|
||||
{
|
||||
if (mp[j] > 0 && (mv[j] > rs_hdr[j].thres || mv[j] < -rs_hdr[j].thres)) {
|
||||
if (mv_pos[j] > mv0_pos[j]) {
|
||||
|
||||
herrs = headcmp(1, rs_hdr[j].header, rs_hdr[j].hLen, mv_pos[j], mv[j]<0, option_dc, rs_hdr[j].spb);
|
||||
if (herrs < 2) { // max 1 bitfehler in header
|
||||
fprintf(stdout, "sample: %d\n", mv_pos[j]);
|
||||
fprintf(stdout, "%s: %.4f (%d)\n", rs_hdr[j].type, mv[j], herrs);
|
||||
header_found = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (header_found) break;
|
||||
header_found = 0;
|
||||
|
||||
}
|
||||
|
||||
|
||||
free_buffers();
|
||||
|
||||
fclose(fp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
Ładowanie…
Reference in New Issue