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radiosonde_auto_rx/demod/lms6dm_dft.c

1066 wiersze
26 KiB
C
Czysty Wina Historia

/*
* LMS6
* (403 MHz)
*
* sync header: correlation/matched filter
* files: lms6dm_dft.c demod_dft.h demod_dft.c bch_ecc.c
* compile:
* gcc -c demod_dft.c
* gcc lms6dm_dft.c demod_dft.o -lm -o lms6dm_dft
* usage:
* ./lms6dm_dft -v --vit --ecc <audio.wav>
*
* author: zilog80
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#ifdef CYGWIN
#include <fcntl.h> // cygwin: _setmode()
#include <io.h>
#endif
typedef unsigned char ui8_t;
typedef unsigned short ui16_t;
typedef unsigned int ui32_t;
#include "demod_dft.h"
#include "bch_ecc.c" // RS/ecc/
int option_verbose = 0, // ausfuehrliche Anzeige
option_raw = 0, // rohe Frames
option_ecc = 0,
option_vit = 0,
option_inv = 0, // invertiert Signal
option_dc = 0,
wavloaded = 0;
int wav_channel = 0; // audio channel: left
/* -------------------------------------------------------------------------- */
#define BAUD_RATE 4800
#define BITS 8
#define HEADOFS 0 //16
#define HEADLEN ((4*16)-HEADOFS)
char rawheader[] = "0101011000001000""0001110010010111""0001101010100111""0011110100111110"; // (c0,inv(c1))
// (00) 58 f3 3f b8
//char header[] = "0000001101011101""0100100111000010""0100111111110010""0110100001101011"; // (c0,c1)
ui8_t rs_sync[] = { 0x00, 0x58, 0xf3, 0x3f, 0xb8};
// 0x58f33fb8 little-endian <-> 0x1ACFFC1D big-endian bytes
#define SYNC_LEN 5
#define FRM_LEN (223)
#define PAR_LEN (32)
#define FRMBUF_LEN (3*FRM_LEN)
#define BLOCKSTART (SYNC_LEN*BITS*2)
#define BLOCK_LEN (FRM_LEN+PAR_LEN+SYNC_LEN) // 255+5 = 260
#define RAWBITBLOCK_LEN ((BLOCK_LEN+1)*BITS*2) // (+1 tail)
// (00) 58 f3 3f b8
char blk_rawbits[RAWBITBLOCK_LEN+SYNC_LEN*BITS*2 +8] = "0000000000000000""0000001101011101""0100100111000010""0100111111110010""0110100001101011";
//char *block_rawbits = blk_rawbits+SYNC_LEN*BITS*2;
float soft_rawbits[RAWBITBLOCK_LEN+SYNC_LEN*BITS*2 +8] =
{ -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0,
-1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0,
-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0,
-1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0,
-1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0 };
ui8_t block_bytes[BLOCK_LEN+8];
ui8_t frm_sync[] = { 0x24, 0x54, 0x00, 0x00};
ui8_t frame[FRM_LEN] = { 0x24, 0x54, 0x00, 0x00}; // dataheader
ui8_t *p_frame = frame;
#define FRAME_LEN (300) // 4800baud, 16bits/byte
#define BITFRAME_LEN (FRAME_LEN*BITS)
#define RAWBITFRAME_LEN (BITFRAME_LEN*2)
#define OVERLAP 64
#define OFS 4
char frame_bits[BITFRAME_LEN+OVERLAP*BITS +8]; // init L-1 bits mit 0
#define L 7 // d_f=10
char polyA[] = "1001111"; // 0x4f: x^6+x^3+x^2+x+1
char polyB[] = "1101101"; // 0x6d: x^6+x^5+x^3+x^2+1
/*
// d_f=6
qA[] = "1110011"; // 0x73: x^6+x^5+x^4+x+1
qB[] = "0011110"; // 0x1e: x^4+x^3+x^2+x
pA[] = "10010101"; // 0x95: x^7+x^4+x^2+1 = (x+1)(x^6+x^5+x^4+x+1) = (x+1)qA
pB[] = "00100010"; // 0x22: x^5+x = (x+1)(x^4+x^3+x^2+x)=x(x+1)^3 = (x+1)qB
polyA = qA + x*qB
polyB = qA + qB
*/
char vit_rawbits[RAWBITFRAME_LEN+OVERLAP*BITS*2 +8];
char vits_rawbits[RAWBITFRAME_LEN+OVERLAP*BITS*2 +8];
char vits_bits[BITFRAME_LEN+OVERLAP*BITS +8];
#define N (1 << L)
#define M (1 << (L-1))
typedef struct {
ui8_t bIn;
ui8_t codeIn;
int w;
int prevState;
float sw;
} states_t;
states_t vit_state[RAWBITFRAME_LEN+OVERLAP +8][M];
states_t vit_d[N];
ui8_t vit_code[N];
int vit_initCodes() {
int cA, cB;
int i, bits;
for (bits = 0; bits < N; bits++) {
cA = 0;
cB = 0;
for (i = 0; i < L; i++) {
cA ^= (polyA[L-1-i]&1) & ((bits >> i)&1);
cB ^= (polyB[L-1-i]&1) & ((bits >> i)&1);
}
vit_code[bits] = (cA<<1) | cB;
}
return 0;
}
int vit_dist(int c, char *rc) {
return (((c>>1)^rc[0])&1) + ((c^rc[1])&1);
}
int vit_start(char *rc) {
int t, m, j, c, d;
t = L-1;
m = M;
while ( t > 0 ) { // t=0..L-2: nextState<M
for (j = 0; j < m; j++) {
vit_state[t][j].prevState = j/2;
}
t--;
m /= 2;
}
m = 2;
for (t = 1; t < L; t++) {
for (j = 0; j < m; j++) {
c = vit_code[j];
vit_state[t][j].bIn = j % 2;
vit_state[t][j].codeIn = c;
d = vit_dist( c, rc+2*(t-1) );
vit_state[t][j].w = vit_state[t-1][vit_state[t][j].prevState].w + d;
}
m *= 2;
}
return t;
}
int vit_next(int t, char *rc) {
int b, nstate;
int j, index;
for (j = 0; j < M; j++) {
for (b = 0; b < 2; b++) {
nstate = j*2 + b;
vit_d[nstate].bIn = b;
vit_d[nstate].codeIn = vit_code[nstate];
vit_d[nstate].prevState = j;
vit_d[nstate].w = vit_state[t][j].w + vit_dist( vit_d[nstate].codeIn, rc );
}
}
for (j = 0; j < M; j++) {
if ( vit_d[j].w <= vit_d[j+M].w ) index = j; else index = j+M;
vit_state[t+1][j] = vit_d[index];
}
return 0;
}
int vit_path(int j, int t) {
int c;
vit_rawbits[2*t] = '\0';
while (t > 0) {
c = vit_state[t][j].codeIn;
vit_rawbits[2*t -2] = 0x30 + ((c>>1) & 1);
vit_rawbits[2*t -1] = 0x30 + (c & 1);
j = vit_state[t][j].prevState;
t--;
}
return 0;
}
int viterbi(char *rc) {
int t, tmax;
int j, j_min, w_min;
vit_start(rc);
tmax = strlen(rc)/2;
for (t = L-1; t < tmax; t++)
{
vit_next(t, rc+2*t);
}
w_min = -1;
for (j = 0; j < M; j++) {
if (w_min < 0) {
w_min = vit_state[tmax][j].w;
j_min = j;
}
if (vit_state[tmax][j].w < w_min) {
w_min = vit_state[tmax][j].w;
j_min = j;
}
}
vit_path(j_min, tmax);
return 0;
}
float vits_dist(int c, float *rc) {
int bit0 = ((c>>1)&1) * 2 - 1;
int bit1 = (c&1) * 2 - 1;
return sqrt( (bit0-rc[0])*(bit0-rc[0]) + (bit1-rc[1])*(bit1-rc[1]) );
}
int vits_start(float *rc) {
int t, m, j, c;
float d;
t = L-1;
m = M;
while ( t > 0 ) { // t=0..L-2: nextState<M
for (j = 0; j < m; j++) {
vit_state[t][j].prevState = j/2;
}
t--;
m /= 2;
}
m = 2;
for (t = 1; t < L; t++) {
for (j = 0; j < m; j++) {
c = vit_code[j];
vit_state[t][j].bIn = j % 2;
vit_state[t][j].codeIn = c;
d = vits_dist( c, rc+2*(t-1) );
vit_state[t][j].sw = vit_state[t-1][vit_state[t][j].prevState].sw + d;
}
m *= 2;
}
return t;
}
int vits_next(int t, float *rc) {
int b, nstate;
int j, index;
for (j = 0; j < M; j++) {
for (b = 0; b < 2; b++) {
nstate = j*2 + b;
vit_d[nstate].bIn = b;
vit_d[nstate].codeIn = vit_code[nstate];
vit_d[nstate].prevState = j;
vit_d[nstate].sw = vit_state[t][j].sw + vits_dist( vit_d[nstate].codeIn, rc );
}
}
for (j = 0; j < M; j++) {
if ( vit_d[j].sw <= vit_d[j+M].sw ) index = j; else index = j+M;
vit_state[t+1][j] = vit_d[index];
}
return 0;
}
int vits_path(int j, int t) {
int c;
int dec;
vits_rawbits[2*t] = '\0';
vits_bits[t] = '\0';
while (t > 0) {
dec = vit_state[t][j].bIn;
vits_bits[t-1] = 0x30 + dec;
c = vit_state[t][j].codeIn;
vits_rawbits[2*t -2] = 0x30 + ((c>>1) & 1);
vits_rawbits[2*t -1] = 0x30 + (c & 1);
j = vit_state[t][j].prevState;
t--;
}
return 0;
}
int viterbi_soft(float *rc, int len) {
int t, tmax;
int j, j_min;
float sw_min;
vits_start(rc);
tmax = len/2;
for (t = L-1; t < tmax; t++)
{
vits_next(t, rc+2*t);
}
sw_min = -1.0;
for (j = 0; j < M; j++) {
if (sw_min < 0.0) {
sw_min = vit_state[tmax][j].sw;
j_min = j;
}
if (vit_state[tmax][j].sw < sw_min) {
sw_min = vit_state[tmax][j].sw;
j_min = j;
}
}
vits_path(j_min, tmax);
return 0;
}
// ------------------------------------------------------------------------
int deconv(char* rawbits, char *bits) {
int j, n, bitA, bitB;
char *p;
int len;
int errors = 0;
int m = L-1;
len = strlen(rawbits);
for (j = 0; j < m; j++) bits[j] = '0';
n = 0;
while ( 2*(m+n) < len ) {
p = rawbits+2*(m+n);
bitA = bitB = 0;
for (j = 0; j < m; j++) {
bitA ^= (bits[n+j]&1) & (polyA[j]&1);
bitB ^= (bits[n+j]&1) & (polyB[j]&1);
}
if ( (bitA^(p[0]&1))==(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = '1';
else if ( (bitA^(p[0]&1))==0 && (bitB^(p[1]&1))==0 ) bits[n+m] = '0';
else {
if ( (bitA^(p[0]&1))!=(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = 0x39;
else bits[n+m] = 0x38;
errors = n;
break;
}
n += 1;
}
bits[n+m] = '\0';
return errors;
}
// ------------------------------------------------------------------------
int crc16_0(ui8_t frame[], int len) {
int crc16poly = 0x1021;
int rem = 0x0, i, j;
int byte;
for (i = 0; i < len; i++) {
byte = frame[i];
rem = rem ^ (byte << 8);
for (j = 0; j < 8; j++) {
if (rem & 0x8000) {
rem = (rem << 1) ^ crc16poly;
}
else {
rem = (rem << 1);
}
rem &= 0xFFFF;
}
}
return rem;
}
int check_CRC(ui8_t frame[]) {
ui32_t crclen = 0,
crcdat = 0;
crclen = 221;
crcdat = (frame[crclen]<<8) | frame[crclen+1];
if ( crcdat != crc16_0(frame, crclen) ) {
return 1; // CRC NO
}
else return 0; // CRC OK
}
// ------------------------------------------------------------------------
int bits2bytes(char *bitstr, ui8_t *bytes) {
int i, bit, d, byteval;
int len = strlen(bitstr)/8;
int bitpos, bytepos;
bitpos = 0;
bytepos = 0;
while (bytepos < len) {
byteval = 0;
d = 1;
for (i = 0; i < BITS; i++) {
bit=*(bitstr+bitpos+i); /* little endian */
//bit=*(bitstr+bitpos+7-i); /* big endian */
if ((bit == '1') || (bit == '9')) byteval += d;
else /*if ((bit == '0') || (bit == '8'))*/ byteval += 0;
d <<= 1;
}
bitpos += BITS;
bytes[bytepos++] = byteval & 0xFF;
}
//while (bytepos < FRAME_LEN+OVERLAP) bytes[bytepos++] = 0;
return bytepos;
}
/* -------------------------------------------------------------------------- */
typedef struct {
int frnr;
int sn;
int week; int gpstow;
int jahr; int monat; int tag;
int wday;
int std; int min; float sek;
double lat; double lon; double h;
double vH; double vD; double vV;
double vE; double vN; double vU;
//int freq;
} gpx_t;
gpx_t gpx;
gpx_t gpx0 = { 0 };
#define pos_SondeSN (OFS+0x00) // ?4 byte 00 7A....
#define pos_FrameNb (OFS+0x04) // 2 byte
//GPS Position
#define pos_GPSTOW (OFS+0x06) // 4 byte
#define pos_GPSlat (OFS+0x0E) // 4 byte
#define pos_GPSlon (OFS+0x12) // 4 byte
#define pos_GPSalt (OFS+0x16) // 4 byte
//GPS Velocity East-North-Up (ENU)
#define pos_GPSvO (OFS+0x1A) // 3 byte
#define pos_GPSvN (OFS+0x1D) // 3 byte
#define pos_GPSvV (OFS+0x20) // 3 byte
int get_SondeSN() {
unsigned byte;
byte = (p_frame[pos_SondeSN]<<24) | (p_frame[pos_SondeSN+1]<<16)
| (p_frame[pos_SondeSN+2]<<8) | p_frame[pos_SondeSN+3];
gpx.sn = byte & 0xFFFFFF;
return 0;
}
int get_FrameNb() {
int i;
unsigned byte;
ui8_t frnr_bytes[2];
int frnr;
gpx = gpx0;
for (i = 0; i < 2; i++) {
byte = p_frame[pos_FrameNb + i];
frnr_bytes[i] = byte;
}
frnr = (frnr_bytes[0] << 8) + frnr_bytes[1] ;
gpx.frnr = frnr;
return 0;
}
char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
//char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
int get_GPStime() {
int i;
unsigned byte;
ui8_t gpstime_bytes[4];
int gpstime = 0, // 32bit
day;
float ms;
for (i = 0; i < 4; i++) {
byte = p_frame[pos_GPSTOW + i];
gpstime_bytes[i] = byte;
}
gpstime = 0;
for (i = 0; i < 4; i++) {
gpstime |= gpstime_bytes[i] << (8*(3-i));
}
gpx.gpstow = gpstime;
ms = gpstime % 1000;
gpstime /= 1000;
day = gpstime / (24 * 3600);
gpstime %= (24*3600);
if ((day < 0) || (day > 6)) return -1;
gpx.wday = day;
gpx.std = gpstime / 3600;
gpx.min = (gpstime % 3600) / 60;
gpx.sek = gpstime % 60 + ms/1000.0;
return 0;
}
double B60B60 = 0xB60B60; // 2^32/360 = 0xB60B60.xxx
int get_GPSlat() {
int i;
unsigned byte;
ui8_t gpslat_bytes[4];
int gpslat;
double lat;
for (i = 0; i < 4; i++) {
byte = p_frame[pos_GPSlat + i];
if (byte > 0xFF) return -1;
gpslat_bytes[i] = byte;
}
gpslat = 0;
for (i = 0; i < 4; i++) {
gpslat |= gpslat_bytes[i] << (8*(3-i));
}
lat = gpslat / B60B60;
gpx.lat = lat;
return 0;
}
int get_GPSlon() {
int i;
unsigned byte;
ui8_t gpslon_bytes[4];
int gpslon;
double lon;
for (i = 0; i < 4; i++) {
byte = p_frame[pos_GPSlon + i];
if (byte > 0xFF) return -1;
gpslon_bytes[i] = byte;
}
gpslon = 0;
for (i = 0; i < 4; i++) {
gpslon |= gpslon_bytes[i] << (8*(3-i));
}
lon = gpslon / B60B60;
gpx.lon = lon;
return 0;
}
int get_GPSalt() {
int i;
unsigned byte;
ui8_t gpsheight_bytes[4];
int gpsheight;
double height;
for (i = 0; i < 4; i++) {
byte = p_frame[pos_GPSalt + i];
if (byte > 0xFF) return -1;
gpsheight_bytes[i] = byte;
}
gpsheight = 0;
for (i = 0; i < 4; i++) {
gpsheight |= gpsheight_bytes[i] << (8*(3-i));
}
height = gpsheight / 1000.0;
gpx.h = height;
if (height < -100 || height > 60000) return -1;
return 0;
}
int get_GPSvel24() {
int i;
unsigned byte;
ui8_t gpsVel_bytes[3];
int vel24;
double vx, vy, vz, dir; //, alpha;
for (i = 0; i < 3; i++) {
byte = p_frame[pos_GPSvO + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vx = vel24 / 1e3; // ost
for (i = 0; i < 3; i++) {
byte = p_frame[pos_GPSvN + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vy= vel24 / 1e3; // nord
for (i = 0; i < 3; i++) {
byte = p_frame[pos_GPSvV + i];
if (byte > 0xFF) return -1;
gpsVel_bytes[i] = byte;
}
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
vz = vel24 / 1e3; // hoch
gpx.vE = vx;
gpx.vN = vy;
gpx.vU = vz;
gpx.vH = sqrt(vx*vx+vy*vy);
/*
alpha = atan2(vy, vx)*180/M_PI; // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts)
dir = 90-alpha; // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht
if (dir < 0) dir += 360; // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t)
gpx.vD2 = dir;
*/
dir = atan2(vx, vy) * 180 / M_PI;
if (dir < 0) dir += 360;
gpx.vD = dir;
gpx.vV = vz;
return 0;
}
// RS(255,223)-CCSDS
#define rs_N 255
#define rs_K 223
#define rs_R (rs_N-rs_K) // 32
ui8_t rs_cw[rs_N];
int lms6_ecc(ui8_t *cw) {
int errors;
ui8_t err_pos[rs_R],
err_val[rs_R];
errors = rs_decode(cw, err_pos, err_val);
return errors;
}
void print_frame(int crc_err, int len) {
int err=0;
if (p_frame[0] != 0)
{
//if ((p_frame[pos_SondeSN+1] & 0xF0) == 0x70) // ? beginnen alle SNs mit 0x7A.... bzw 80..... ?
if ( p_frame[pos_SondeSN+1] )
{
get_FrameNb();
get_GPStime();
get_SondeSN();
if (option_verbose) printf(" (%7d) ", gpx.sn);
printf(" [%5d] ", gpx.frnr);
printf("%s ", weekday[gpx.wday]);
printf("(%02d:%02d:%06.3f) ", gpx.std, gpx.min, gpx.sek); // falls Rundung auf 60s: Ueberlauf
get_GPSlat();
get_GPSlon();
err = get_GPSalt();
if (!err) {
printf(" lat: %.6f° ", gpx.lat);
printf(" lon: %.6f° ", gpx.lon);
printf(" alt: %.2fm ", gpx.h);
//if (option_verbose)
{
get_GPSvel24();
//if (option_verbose == 2) printf(" (%.1f ,%.1f,%.1f) ", gpx.vE, gpx.vN, gpx.vU);
printf(" vH: %.1fm/s D: %.1f° vV: %.1fm/s ", gpx.vH, gpx.vD, gpx.vV);
}
}
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
printf("\n");
}
}
}
int blk_pos = SYNC_LEN;
int frm_pos = 0;
int sf = 0;
void proc_frame(int len) {
char *rawbits = NULL;
int i, j;
int err = 0;
int errs = 0;
int crc_err = 0;
int flen, blen;
if ((len % 8) > 4) {
while (len % 8) blk_rawbits[len++] = '0';
}
//if (len > RAWBITFRAME_LEN+OVERLAP*BITS*2) len = RAWBITFRAME_LEN+OVERLAP*BITS*2;
//for (i = len; i < RAWBITFRAME_LEN+OVERLAP*BITS*2; i++) frame_rawbits[i] = 0; // oder: '0'
blk_rawbits[len] = '\0';
flen = len / (2*BITS);
if (option_vit == 1) {
viterbi(blk_rawbits);
rawbits = vit_rawbits;
}
else if (option_vit == 2) {
viterbi_soft(soft_rawbits, len);
rawbits = vits_rawbits;
}
else rawbits = blk_rawbits;
err = deconv(rawbits, frame_bits);
if (err) { for (i=err; i < RAWBITBLOCK_LEN/2; i++) frame_bits[i] = 0; }
blen = bits2bytes(frame_bits, block_bytes);
for (j = blen; j < flen; j++) block_bytes[j] = 0;
if (option_ecc) {
for (j = 0; j < rs_N; j++) rs_cw[rs_N-1-j] = block_bytes[SYNC_LEN+j];
errs = lms6_ecc(rs_cw);
for (j = 0; j < rs_N; j++) block_bytes[SYNC_LEN+j] = rs_cw[rs_N-1-j];
}
if (option_raw == 2) {
for (i = 0; i < flen; i++) printf("%02x ", block_bytes[i]);
if (option_ecc) printf("(%d)", errs);
printf("\n");
}
else if (option_raw == 4 && option_ecc) {
for (i = 0; i < rs_N; i++) printf("%02x", block_bytes[SYNC_LEN+i]);
printf(" (%d)", errs);
printf("\n");
}
else if (option_raw == 8) {
if (option_vit == 1) {
for (i = 0; i < len; i++) printf("%c", vit_rawbits[i]); printf("\n");
}
else if (option_vit == 2) {
for (i = 0; i < len; i++) printf("%c", vits_rawbits[i]); printf("\n");
}
else {
for (i = 0; i < len; i++) printf("%c", blk_rawbits[i]); printf("\n");
}
}
blk_pos = SYNC_LEN;
while ( blk_pos-SYNC_LEN < FRM_LEN ) {
if (sf == 0) {
while ( blk_pos-SYNC_LEN < FRM_LEN ) {
sf = 0;
for (j = 0; j < 4; j++) sf += (block_bytes[blk_pos+j] == frm_sync[j]);
if (sf == 4) {
frm_pos = 0;
break;
}
blk_pos++;
}
}
if ( sf && frm_pos < FRM_LEN ) {
frame[frm_pos] = block_bytes[blk_pos];
frm_pos++;
blk_pos++;
}
if (frm_pos == FRM_LEN) {
crc_err = check_CRC(p_frame);
if (option_raw == 1) {
for (i = 0; i < FRM_LEN; i++) printf("%02x ", p_frame[i]);
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
printf("\n");
}
if (option_raw == 0) print_frame(crc_err, len);
frm_pos = 0;
sf = 0;
}
}
}
int main(int argc, char **argv) {
FILE *fp = NULL;
char *fpname = NULL;
float spb = 0.0;
int header_found = 0;
int bit, rbit;
int bitpos = 0;
int bitQ;
int pos;
int herrs, herr1;
int headerlen = 0;
int k,K;
float mv;
unsigned int mv_pos, mv0_pos;
int mp = 0;
float thres = 0.76;
int bitofs = 0;
int symlen = 1;
unsigned int bc = 0;
float sb = 0.0;
float sbit = 0.0;
float level = -1.0, ll = -1.0;
#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");
fprintf(stderr, " -r, --raw\n");
fprintf(stderr, " --vit,--vit2 (Viterbi/soft)\n");
fprintf(stderr, " --ecc (Reed-Solomon)\n");
return 0;
}
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; // bytes - rs_ecc_codewords
}
else if ( (strcmp(*argv, "-r0") == 0) || (strcmp(*argv, "--raw0") == 0) ) {
option_raw = 2; // bytes: sync + codewords
}
else if ( (strcmp(*argv, "-rc") == 0) || (strcmp(*argv, "--rawecc") == 0) ) {
option_raw = 4; // rs_ecc_codewords
}
else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
option_raw = 8; // rawbits
}
else if (strcmp(*argv, "--ecc" ) == 0) { option_ecc = 1; } // RS-ECC
else if (strcmp(*argv, "--vit" ) == 0) { option_vit = 1; } // viterbi-hard
else if (strcmp(*argv, "--vit2") == 0) { option_vit = 2; } // viterbi-soft
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
option_inv = 1;
}
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);
}
else return -1;
}
else if ( (strcmp(*argv, "--level") == 0) ) {
++argv;
if (*argv) {
ll = atof(*argv);
}
else return -1;
}
else {
fp = fopen(*argv, "rb");
if (fp == NULL) {
fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
return -1;
}
wavloaded = 1;
}
++argv;
}
if (!wavloaded) fp = stdin;
spb = read_wav_header(fp, (float)BAUD_RATE, wav_channel);
if ( spb < 0 ) {
fclose(fp);
fprintf(stderr, "error: wav header\n");
return -1;
}
if ( spb < 8 ) {
fprintf(stderr, "note: sample rate low\n");
}
if (option_raw == 4) option_ecc = 1;
if (option_vit) {
vit_initCodes();
}
if (option_ecc) {
rs_init_RS255ccsds(); // bch_ecc.c
}
symlen = 1;
headerlen = strlen(rawheader);
bitofs = 1; // +1 .. +2
K = init_buffers(rawheader, headerlen, 2); // shape=2 (alt. shape=1)
if ( K < 0 ) {
fprintf(stderr, "error: init buffers\n");
return -1;
};
level = ll;
k = 0;
mv = -1; mv_pos = 0;
while ( f32buf_sample(fp, option_inv, 1) != EOF ) {
k += 1;
if (k >= K-4) {
mv0_pos = mv_pos;
mp = getCorrDFT(-1, K, 0, &mv, &mv_pos);
k = 0;
}
else {
mv = 0.0;
continue;
}
if (mp > 0 && (mv > thres || mv < -thres)) {
if (mv_pos > mv0_pos) {
header_found = 0;
herrs = headcmp(symlen, rawheader, headerlen, mv_pos, mv<0, option_dc); // (symlen=1)
herr1 = 0;
if (herrs <= 3 && herrs > 0) {
herr1 = headcmp(symlen, rawheader, headerlen, mv_pos+1, mv<0, option_dc);
if (herr1 < herrs) {
herrs = herr1;
herr1 = 1;
}
}
if (herrs <= 3) header_found = 1; // herrs <= 3 bitfehler in header
if (header_found) {
if (ll <= 0) level = header_level(rawheader, headerlen, mv_pos, mv<0) * 0.6;
bitpos = 0;
pos = BLOCKSTART;
if (mv > 0) bc = 0; else bc = 1;
while ( pos < RAWBITBLOCK_LEN ) {
header_found = !(pos>=RAWBITBLOCK_LEN-10);
//bitQ = read_sbit(fp, symlen, &rbit, option_inv, bitofs, bitpos==0, !header_found); // symlen=1, return: zeroX/bit
bitQ = read_softbit(fp, symlen, &rbit, &sb, level, option_inv, bitofs, bitpos==0, !header_found); // symlen=1, return: zeroX/bit
if (bitQ == EOF) { break; }
bit = rbit ^ (bc%2); // (c0,inv(c1))
blk_rawbits[pos] = 0x30 + bit;
sbit = sb * (-(int)(bc%2)*2+1);
soft_rawbits[pos] = sbit;
bc++;
pos++;
bitpos += 1;
}
blk_rawbits[pos] = '\0';
soft_rawbits[pos] = 0;
proc_frame(pos);
if (pos < RAWBITBLOCK_LEN) break;
pos = BLOCKSTART;
header_found = 0;
}
}
}
}
free_buffers();
fclose(fp);
return 0;
}
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