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3psk.c
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/*
3psk - 3-pole Phase Shift Keying
Copyright (c) Edward Cree, 2012-14
Licensed under the GNU GPL v3+
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <complex.h>
#include <fftw3.h>
#include <atg.h>
#include "bits.h"
#include "varicode.h"
#include "strbuf.h"
#include "gui.h"
#include "frontend.h"
#include "audio.h"
#include "ptt.h"
#define CONSLEN 256
#define CONSDLEN ((int)floor(CONSLEN*min(bw, 750)/750))
#define BITBUFLEN 16
#define PHASLEN 25
#define txstart(lead) if(G.tx&&!*G.tx) { *G.tx=true; txlead=max(txb(G), (lead)); }
#define read_spinner(G,name) (((G).name&&(G).name->elemdata)?((atg_spinner *)(G).name->elemdata)->value:0)
#define txb(G) read_spinner(G,txb)
#define txf(G) read_spinner(G,txf)
#define rxs(G) read_spinner(G,rxs)
#define amp(G) read_spinner(G,amp)
void ztoxy(fftw_complex z, double gsf, int *x, int *y);
int main(int argc, char **argv)
{
unsigned int init_txf=1800; // centre frequency, Hz
double rxf=init_txf;
bool setrxf=false;
double aif=4500; // approximate IF, Hz
unsigned int init_rxs=28;
unsigned int init_amp=10;
bool init_moni=true, init_afc=false;
unsigned int init_txb=60;
unsigned int bws=2;
unsigned int rxbuflen=AUDIOBUFLEN, txbuflen=AUDIOBUFLEN, sdlbuflen=AUDIOBUFLEN;
char init_macro[6][MACROLEN];
for(unsigned int i=0;i<6;i++)
init_macro[i][0]=0;
const char *wavrx=NULL;
bool textout=false;
const char *conffile=NULL;
sample_rate=SAMPLE_RATE;
struct ptt_settings ptt={.devpath=NULL, .devfd=-1, .inverted=false, .line=PTT_LINE_NONE};
for(int arg=1;arg<argc;arg++)
{
if(strncmp(argv[arg], "--conf=", 7)==0)
conffile=argv[arg]+7;
}
FILE *conffp=NULL;
#ifdef WINDOWS
if(!conffile)
conffile="3psk.conf";
#else
if(!conffile)
{
const char *home=getenv("HOME");
if(!home)
{
perror("No $HOME; getenv");
return(1);
}
size_t n=strlen(home)+7;
char *fn=malloc(n);
if(!fn)
{
perror("malloc");
return(1);
}
snprintf(fn, n, "%s/.3psk", home);
conffp=fopen(fn, "r");
if(!conffp)
{
fprintf(stderr, "Failed to open %s: fopen: %s\n", fn, strerror(errno));
}
free(fn);
}
else
#endif
{
conffp=fopen(conffile, "r");
if(!conffp)
{
fprintf(stderr, "Failed to open %s: fopen: %s\n", conffile, strerror(errno));
}
}
if(conffp)
{
while(!feof(conffp))
{
char *line=fgetl(conffp);
if(!line) break;
switch(*line)
{
case '#': // comment
case 0:
break;
default:
{
char *colon=strchr(line, ':');
if(colon) *colon++=0;
if((line[0]=='F')&&isdigit(line[1])&&!line[2])
{
int i=line[1]-'0'; // XXX possibly non-portable
if((i<1)||(i>NMACROS))
{
fprintf(stderr, "Bad item in conffile: `F%d' (only F1 to F%d are allowed)\n", i, NMACROS);
return(1);
}
size_t j=0;
while((j<MACROLEN)&&colon&&*colon)
{
char p=*colon++;
switch(p)
{
case '\\':
p=*colon++;
switch(p)
{
case 'n':
p='\n';
break;
case 't':
p='\t';
break;
case 'r':
p='\r';
break;
}
break;
default:
break;
}
init_macro[i-1][j++]=p;
init_macro[i-1][j]=0;
}
}
else if(strcmp(line, "TXF")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &init_txf)!=1)
{
fprintf(stderr, "Bad TXF in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad TXF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "RXF")==0)
{
if(colon)
{
if(sscanf(colon, "%lg", &rxf)!=1)
{
fprintf(stderr, "Bad RXF in conffile: %s not numeric\n", colon);
return(1);
}
setrxf=true;
}
else
{
fprintf(stderr, "Bad RXF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "TXB")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &init_txb)!=1)
{
fprintf(stderr, "Bad TXB in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad TXB in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "RXS")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &init_rxs)!=1)
{
fprintf(stderr, "Bad RXS in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad RXS in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "AMP")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &init_amp)!=1)
{
fprintf(stderr, "Bad AMP in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad AMP in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "BW")==0)
{
if(colon)
{
unsigned int bw;
if(sscanf(colon, "%u", &bw)!=1)
{
fprintf(stderr, "Bad BW in conffile: %s not numeric\n", colon);
return(1);
}
unsigned int i;
for(i=0;i<4;i++)
if(bw==bandwidths[i])
break;
if(i<4)
bws=i;
else
{
fprintf(stderr, "Bad BW in conffile: invalid value %u\n", bw);
fprintf(stderr, "\tValid values are: %u", bandwidths[0]);
for(unsigned int i=1;i<4;i++)
fprintf(stderr, ", %u", bandwidths[i]);
fprintf(stderr, "\n");
return(1);
}
}
else
{
fprintf(stderr, "Bad BW in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "IF")==0)
{
if(colon)
{
if(sscanf(colon, "%lg", &aif)!=1)
{
fprintf(stderr, "Bad IF in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad IF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "SR")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &sample_rate)!=1)
{
fprintf(stderr, "Bad SR in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad SR in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "MONI")==0)
init_moni=true;
else if(strcmp(line, "!MONI")==0)
init_moni=false;
else if(strcmp(line, "AFC")==0)
init_afc=true;
else if(strcmp(line, "!AFC")==0)
init_afc=false;
else if(strcmp(line, "TEXT")==0)
textout=true;
else if(strcmp(line, "!TEXT")==0)
textout=false;
else if(strcmp(line, "Au.SDLBUF")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &sdlbuflen)!=1)
{
fprintf(stderr, "Bad Au.SDLBUF in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad Au.SDLBUF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "Au.TXBUF")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &txbuflen)!=1)
{
fprintf(stderr, "Bad Au.TXBUF in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad Au.TXBUF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "Au.RXBUF")==0)
{
if(colon)
{
if(sscanf(colon, "%u", &rxbuflen)!=1)
{
fprintf(stderr, "Bad Au.RXBUF in conffile: %s not numeric\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad Au.RXBUF in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "!Ptt")==0)
{
ptt.line=PTT_LINE_NONE;
}
else if(strcmp(line, "Ptt.DEV")==0)
{
if(colon)
{
ptt.devpath=strdup(colon);
}
else
{
fprintf(stderr, "Bad Ptt.DEV in conffile: no argument\n");
return(1);
}
}
else if(strcmp(line, "Ptt.INV")==0)
{
ptt.inverted=true;
}
else if(strcmp(line, "Ptt.!INV")==0)
{
ptt.inverted=false;
}
else if(strcmp(line, "Ptt.LINE")==0)
{
if(colon)
{
if(strcmp(colon, "RTS")==0)
ptt.line=PTT_LINE_RTS;
else if(strcmp(colon, "DTR")==0)
ptt.line=PTT_LINE_DTR;
else if(strcmp(colon, "BOTH")==0)
ptt.line=PTT_LINE_BOTH;
else
{
fprintf(stderr, "Bad Ptt.LINE in conffile: unrecognised value \"%s\"\n", colon);
return(1);
}
}
else
{
fprintf(stderr, "Bad Ptt.LINE in conffile: no argument\n");
return(1);
}
}
else
{
fprintf(stderr, "conffile: ignoring unrecognised line: %s:%s\n", line, colon);
}
}
break;
}
free(line);
}
fclose(conffp);
}
else
{
fprintf(stderr, "No conffile. Install one at ");
#ifdef WINDOWS
fprintf(stderr, "3psk.conf\n");
#else // !WINDOWS
fprintf(stderr, "~/.3psk\n");
#endif // WINDOWS
}
for(int arg=1;arg<argc;arg++)
{
if(strncmp(argv[arg], "--txf=", 6)==0)
{
sscanf(argv[arg]+6, "%u", &init_txf);
}
else if(strncmp(argv[arg], "--rxf=", 6)==0)
{
sscanf(argv[arg]+6, "%lg", &rxf);
setrxf=true;
}
else if(strncmp(argv[arg], "--rxs=", 6)==0)
{
sscanf(argv[arg]+6, "%u", &init_rxs);
}
else if(strncmp(argv[arg], "--sr=", 5)==0)
{
sscanf(argv[arg]+5, "%u", &sample_rate);
}
else if(strncmp(argv[arg], "--if=", 5)==0)
{
sscanf(argv[arg]+5, "%lg", &aif);
}
else if(strncmp(argv[arg], "--amp=", 6)==0)
{
sscanf(argv[arg]+5, "%u", &init_amp);
}
else if(strncmp(argv[arg], "--txb=", 6)==0)
{
sscanf(argv[arg]+6, "%u", &init_txb);
}
else if(strncmp(argv[arg], "--bw=", 5)==0)
{
unsigned int bw;
sscanf(argv[arg]+5, "%u", &bw);
unsigned int i;
for(i=0;i<4;i++)
if(bw==bandwidths[i])
break;
if(i<4)
bws=i;
else
{
fprintf(stderr, "Bad --bw: invalid value %u\n", bw);
fprintf(stderr, "\tValid values are: %u", bandwidths[0]);
for(unsigned int i=1;i<4;i++)
fprintf(stderr, ", %u", bandwidths[i]);
fprintf(stderr, "\n");
return(1);
}
}
else if(strcmp(argv[arg], "--moni")==0)
{
init_moni=true;
}
else if(strcmp(argv[arg], "--no-moni")==0)
{
init_moni=false;
}
else if(strcmp(argv[arg], "--afc")==0)
{
init_afc=true;
}
else if(strcmp(argv[arg], "--no-afc")==0)
{
init_afc=false;
}
else if(strcmp(argv[arg], "--text")==0)
{
textout=true;
}
else if(strcmp(argv[arg], "--no-text")==0)
{
textout=false;
}
else if(strncmp(argv[arg], "--rx=", 5)==0)
{
wavrx=argv[arg]+5;
}
else if(strncmp(argv[arg], "--conf=", 7)==0)
{
// nothing
}
else
{
fprintf(stderr, "Unrecognised arg `%s'\n", argv[arg]);
return(1);
}
}
sleeptime=(min(rxbuflen, txbuflen)*500)/sample_rate;
if(!setrxf) rxf=init_txf;
fprintf(stderr, "Constructing GUI\n");
gui G;
SDL_Surface *eye_back;
{
int e;
if((e=make_gui(&G, &bws)))
{
fprintf(stderr, "Failed to construct GUI\n");
return(e);
}
if(G.tx) *G.tx=false; else {fprintf(stderr, "Error: G.tx is NULL\n"); return(1);}
if(G.moni) *G.moni=init_moni; else {fprintf(stderr, "Error: G.moni is NULL\n"); return(1);}
if(G.afc) *G.afc=init_afc; else {fprintf(stderr, "Error: G.afc is NULL\n"); return(1);}
if(G.spl) *G.spl=!setrxf; else {fprintf(stderr, "Error: G.spl is NULL\n"); return(1);}
if(G.txb)
{
if((e=setspinval(G.txb, init_txb)))
{
fprintf(stderr, "Failed to set TXB spinner\n");
return(1);
}
}
else {fprintf(stderr, "Error: G.txb is NULL\n"); return(1);}
if(G.txf)
{
if((e=setspinval(G.txf, init_txf)))
{
fprintf(stderr, "Failed to set TXF spinner\n");
return(1);
}
}
else {fprintf(stderr, "Error: G.txf is NULL\n"); return(1);}
if(G.rxf)
{
if((e=setspinval(G.rxf, rxf)))
{
fprintf(stderr, "Failed to set RXF spinner\n");
return(1);
}
}
else {fprintf(stderr, "Error: G.rxf is NULL\n"); return(1);}
if(G.rxs)
{
if((e=setspinval(G.rxs, init_rxs)))
{
fprintf(stderr, "Failed to set RXS spinner\n");
return(1);
}
}
else {fprintf(stderr, "Error: G.rxs is NULL\n"); return(1);}
if(G.amp)
{
if((e=setspinval(G.amp, init_amp)))
{
fprintf(stderr, "Failed to set AMP spinner\n");
return(1);
}
}
else {fprintf(stderr, "Error: G.amp is NULL\n"); return(1);}
for(unsigned int i=0;i<NMACROS;i++)
if(G.macro[i])
snprintf(G.macro[i], MACROLEN, "%s", init_macro[i]);
eye_back=SDL_CreateRGBSurface(SDL_SWSURFACE, 90, 84, G.eye_img->format->BitsPerPixel, G.eye_img->format->Rmask, G.eye_img->format->Gmask, G.eye_img->format->Bmask, G.eye_img->format->Amask);
SDL_SetAlpha(eye_back, SDL_SRCALPHA, 48);
SDL_FillRect(eye_back, NULL, SDL_MapRGB(eye_back->format, EYE_BG.r, EYE_BG.g, EYE_BG.b));
}
int e;
if((e=ptt_open(&ptt)))
fprintf(stderr, "Failed to open PTT: %d\n", e);
unsigned int inp=NMACROS;
fprintf(stderr, "Starting audio subsystem\n");
FILE *rwf=NULL;
if(wavrx)
{
rwf=fopen(wavrx, "rb");
if(!rwf)
perror("--rx: fopen");
}
audiobuf rxaud, txaud;
if(init_audiorx(&rxaud, rxbuflen, sdlbuflen, rwf)) {fprintf(stderr, "Failed to initialise RX AudIO\n"); return(1);}
if(init_audiotx(&txaud, txbuflen, sdlbuflen)) {fprintf(stderr, "Failed to initialise TX AudIO\n"); return(1);}
fprintf(stderr, "Setting up decoder frontend\n");
fprintf(stderr, "frontend: Audio sample rate: %u Hz\n", rxaud.srate);
unsigned long blklen=floor(rxaud.srate/(double)bandwidths[bws]);
double bw=rxaud.srate/(double)blklen;
fprintf(stderr, "frontend: FFT block length: %lu samples\n", blklen);
if(blklen>4095)
{
fprintf(stderr, "frontend: FFT block length too long. Exiting\n");
return(1);
}
fprintf(stderr, "frontend: Filter bandwidth is %g Hz\n", bw);
unsigned long k = max(floor((aif * (double)blklen / (double)rxaud.srate)+0.5), 1);
double truif=(k*rxaud.srate/(double)blklen);
fprintf(stderr, "frontend: Actual IF: %g Hz\n", truif);
fftw_complex *fftin=fftw_malloc(sizeof(fftw_complex)*floor(rxaud.srate/(double)bandwidths[0]));
fftw_complex *fftout=fftw_malloc(sizeof(fftw_complex)*floor(rxaud.srate/(double)bandwidths[0]));
unsigned long speclen=max(floor(rxaud.srate/25.0), 360), spechalf=(speclen>>1)+1;
double spec_hpp=rxaud.srate/(double)speclen;
double *specin=fftw_malloc(sizeof(double)*speclen);
fftw_complex *specout=fftw_malloc(sizeof(fftw_complex)*spechalf);
fftw_set_timelimit(2.0);
fprintf(stderr, "frontend: Preparing FFT plans\n");
fftw_plan p[4], sp_p;
for(unsigned int i=0;i<4;i++)
p[i]=fftw_plan_dft_1d(floor(rxaud.srate/(double)bandwidths[i]), fftin, fftout, FFTW_FORWARD, FFTW_DESTROY_INPUT|FFTW_PATIENT);
sp_p=fftw_plan_dft_r2c_1d(speclen, specin, specout, FFTW_DESTROY_INPUT|FFTW_PATIENT);
fprintf(stderr, "frontend: Ready\n");
fprintf(stderr, "Setting up decoder\n");
double gsf=250.0/(double)blklen;
double sens=(double)blklen/16.0;
fftw_complex points[CONSLEN];
bool lined[CONSLEN];
for(size_t i=0;i<CONSLEN;i++)
{
points[i]=0;
lined[i]=false;
}
bool bitbuf[BITBUFLEN];
unsigned int bitbufp=0;
double old_da[PHASLEN];
for(size_t i=0;i<PHASLEN;i++)
old_da[i]=0;
double t_da=0;
double b_da[2]={-1, 1};
bool fch=false;
unsigned int st_ptr=0;
unsigned int symtime[PHASLEN];
for(size_t i=0;i<PHASLEN;i++)
symtime[i]=0;
bool st_loop=false;
bool crossed[2]={false, false};
unsigned int spec_pt[8][160];
for(unsigned int i=0;i<8;i++)
for(unsigned int j=0;j<160;j++)
spec_pt[i][j]=60;
unsigned int spec_which=0;
double rxdphi=0;
//double txphi=0;
bbuf txbits={0, NULL};
unsigned int txsetp=0, txoldp=0;
unsigned int txlead=0;
int errupt=0;
unsigned long t=0, txt=0, frame=0, lastflip=0;
bool wastx=true;
fprintf(stderr, "Starting main loop\n");
while(!errupt)
{
int16_t si;
bool havesi=false;
bool havetx=cantx(&txaud);
bool istx=(G.tx&&*G.tx)||txlead;
if(istx!=wastx)
{
if((e=ptt_set(istx, &ptt)))
fprintf(stderr, "Failed to set PTT %s: %d\n", istx?"true":"false", e);
}
wastx=istx;
#ifndef WINDOWS
if(G.moni&&*G.moni&&((G.tx&&*G.tx)||txlead))
rxsample(&rxaud, NULL);
else
#endif
havesi=!rxsample(&rxaud, &si);
if(havetx)
{
if((G.tx&&*G.tx)||txlead)
{
if((int)((txt*txb(G))%txaud.srate)<txb(G))
{
txoldp=txsetp;
if(txlead)
{
txlead--;
txsetp=(txsetp+2)%3;
}
else
{
if(!txbits.data) txbits.nbits=0;
if(G.inr&&G.inri&&!txbits.nbits)
{
free(txbits.data);
const char buf[2]={G.inr[0], 0};
if(*buf=='\r')
{
*G.tx=false;
txlead=max(txb(G)/2, 8);
txbits=(bbuf){0, NULL};
}
else
txbits=encode(buf);
append_char(&G.ing, &G.ingl, &G.ingi, *buf);
G.inri--;
for(size_t i=0;i<G.inri;i++)
G.inr[i]=G.inr[i+1];
}
if(txbits.nbits)
{
bool b=*txbits.data;
txbits.nbits--;
for(size_t i=0;i<txbits.nbits;i++)
txbits.data[i]=txbits.data[i+1];
txsetp=(txsetp+(b?1:2))%3;
}
else
{
txsetp=(txsetp+2)%3;
}
}
}
double frac=min(fmod(txt*txb(G)/(double)(txaud.srate), 1)*2.0, 1.0);
/*double sweep=txb(G)*M_PI*2*sin(frac*M_PI)/(double)txaud.srate;
double txaim=txsetp*M_PI*2/3.0;
if((txphi>txaim-M_PI)&&(txphi<=txaim))
txphi=min(txphi+sweep, txaim);
else if(txphi>txaim+M_PI)
txphi=fmod(txphi+sweep, M_PI*2);
else if(txphi<=txaim-M_PI)
txphi=fmod(txphi+M_PI*2-sweep, M_PI*2);
else if((txphi>txaim)&&(txphi<=txaim+M_PI))
txphi=max(txphi-sweep, txaim);
else
{
fprintf(stderr, "Impossible txphi/aim relationship!\n");
txphi=txaim;
}
double txmag=1;//cos(M_PI/3)/cos(fmod(txphi, M_PI*2/3.0)-M_PI/3.0);*/
double ft=(txt*2*M_PI*txf(G)/txaud.srate);//+sin(t*128.0/(double)txaud.srate)*0.2;
//double tx=cos(ft+txphi)*txmag/3.0;
double tx=(cos(ft+txsetp*M_PI*2/3.0)*pow(frac, 1.5)+cos(ft+txoldp*M_PI*2/3.0)*pow(1-frac, 1.5))/3.0;
/*static int16_t nn=1;
if(!nn)
nn=1;
else if(!(txt&3))
nn=(nn<<1)+(((nn>>10)&1)^((nn>>12)&1)^((nn>>13)&1)^((nn>>15)&1));*/
//tx+=(nn-32767.5)/65536.0;
txsample(&txaud, tx*(1<<16)*.8);
txt++;
if(G.moni&&*G.moni)
{
si=tx*(1<<16)*.6;
havesi=true;
}
}
else
txsample(&txaud, 0);
}
if(havesi)
{
double sv=si/(double)(1<<16);
double phi=(t*2*M_PI*(truif-rxf)/rxaud.srate)+rxdphi;
fftin[t%blklen]=sv*(cos(phi)+I*sin(phi))*amp(G)/5.0;
if(!(t%speclen))
{
fftw_execute(sp_p);
SDL_FillRect(G.spectro_img, &(SDL_Rect){0, 0, 160, 60}, SDL_MapRGB(G.spectro_img->format, SPEC_BG.r, SPEC_BG.g, SPEC_BG.b));
int step=max(1, spec_hpp/6);
for(unsigned int h=0;h<40;h+=step)
{
unsigned int x=floor(h*100/spec_hpp)-20;
line(G.spectro_img, x, 0, x, 59, (atg_colour){31, 31, 31, ATG_ALPHA_OPAQUE});
}
unsigned int rx=floor(rxf/spec_hpp)-20;
line(G.spectro_img, rx, 0, rx, 59, (atg_colour){0, 47, 0, ATG_ALPHA_OPAQUE});
unsigned int tx=floor(txf(G)/spec_hpp)-20;
line(G.spectro_img, tx, 0, tx, 59, (atg_colour){63, 0, 0, ATG_ALPHA_OPAQUE});
for(unsigned int j=0;j<160;j++)
{
for(unsigned int k=1;k<8;k++)
pset(G.spectro_img, j, spec_pt[(spec_which+k)%8][j], (atg_colour){k*20, k*20, 0, ATG_ALPHA_OPAQUE});
double mag=4*sqrt(cabs(specout[j+20]));
pset(G.spectro_img, j, spec_pt[spec_which][j]=max(59-mag, 0), (atg_colour){255, 255, 0, ATG_ALPHA_OPAQUE});
}
spec_which=(spec_which+1)%8;
}
specin[t%speclen]=sv;
t++;
if(!(t%blklen))
{
static fftw_complex oldz=0;
fftw_execute(p[bws]);
int x,y;
double oldphi=carg(oldz), newphi=carg(fftout[k]);
double rbar=min((cabs(oldz)+cabs(fftout[k]))*250/blklen, 159);
static unsigned int delt=0;
static bool last;
if(delt<30)
{
if(delt)
line(G.eye_img, (delt-1)*3, (last?0:oldphi)*13+42, delt*3, newphi*13+42, (atg_colour){rbar*0.5, rbar*0.9, rbar*1.6, ATG_ALPHA_OPAQUE});
}
else if((delt>300)&&(rbar>20))
delt=0;
if(!delt)
SDL_BlitSurface(eye_back, NULL, G.eye_img, NULL);
delt++;
last=false;
if((0<oldphi)&&(oldphi<M_PI/3.0)&&(newphi>M_PI/3.0)) crossed[0]=true;
if((0>oldphi)&&(oldphi>-M_PI/3.0)&&(newphi<-M_PI/3.0)) crossed[1]=true;
ztoxy(points[frame%CONSDLEN], gsf, &x, &y);
if(lined[frame%CONSDLEN]) line(G.constel_img, x, y, 60, 60, CONS_BG);
pset(G.constel_img, x, y, CONS_BG);
fftw_complex half=points[(frame+(CONSDLEN>>1))%CONSDLEN];
ztoxy(half, gsf, &x, &y);
atg_colour c=(cabs(half)>sens)?(atg_colour){0, 127, 0, ATG_ALPHA_OPAQUE}:(atg_colour){127, 0, 0, ATG_ALPHA_OPAQUE};
if(lined[(frame+(CONSDLEN>>1))%CONSDLEN]) line(G.constel_img, x, y, 60, 60, (atg_colour){0, 95, 95, ATG_ALPHA_OPAQUE});
pset(G.constel_img, x, y, c);
ztoxy(points[frame%CONSDLEN]=fftout[k], gsf, &x, &y);
bool green=cabs(fftout[k])>sens;
bool enough=false;
double da;
double mda=fabs(da=carg(fftout[k]));
enough=(mda>M_PI/3.0);//&&(mda<M_PI*0.83);
fftw_complex dz=bws?fftout[k]-points[(frame+CONSDLEN-1)%CONSDLEN]:fftout[k]/points[(frame+CONSDLEN-1)%CONSDLEN];
bool spd=bws?(cabs(dz)<cabs(fftout[k])*blklen*blklen/(exp2(((signed)rxs(G)-32)/4.0)*2e4)):(fabs(carg(dz))<blklen/(exp2(((signed)rxs(G)-32)/4.0)*2e2));
oldz=fftout[k];
if((lined[frame%CONSDLEN]=(green&&enough&&(fch||spd))))
{
if(delt>=30)
delt=0;
last=true;
rxdphi-=da;
line(G.constel_img, x, y, 60, 60, (atg_colour){0, 191, 191, ATG_ALPHA_OPAQUE});
line(G.phasing_img, 0, 60, G.phasing_img->w, 60, (atg_colour){0, 191, 191, ATG_ALPHA_OPAQUE});
int py=60+(old_da[st_ptr]-M_PI*2/3.0)*60;
line(G.phasing_img, st_ptr*G.phasing_img->w/PHASLEN, py, (st_ptr+1)*G.phasing_img->w/PHASLEN, py, PHAS_BG);
old_da[st_ptr]=(da<0)?da+M_PI*4/3.0:da;
double d_da=old_da[st_ptr]-M_PI*2/3.0;
t_da+=d_da;
py=60+d_da*60;
b_da[0]=max(b_da[0], d_da);
b_da[1]=min(b_da[1], d_da);
line(G.phasing_img, st_ptr*G.phasing_img->w/PHASLEN, py, (st_ptr+1)*G.phasing_img->w/PHASLEN, py, (da>0)?(atg_colour){255, 191, 255, ATG_ALPHA_OPAQUE}:(atg_colour){255, 255, 127, ATG_ALPHA_OPAQUE});
unsigned int dt=t-symtime[st_ptr];
double baud=rxaud.srate*(st_loop?PHASLEN:st_ptr)/(double)dt;
snprintf(G.bauds, 9, "RXB %03d", (int)floor(baud+.5));
symtime[st_ptr]=t;
st_ptr=(st_ptr+1)%PHASLEN;
if(!st_ptr) st_loop=true;
if(G.afc&&*G.afc)
{
if(crossed[(da>0)?1:0]&&!crossed[(da>0)?0:1])
{
double ch=4.0/da;
rxf-=ch;
setspinval(G.rxf, floor(rxf+.5));
}
}
crossed[0]=crossed[1]=false;
if(!st_ptr)
{
if(G.afc&&*G.afc)
{
double diff=b_da[0]-b_da[1];
double ch=t_da*rxaud.srate/(double)(dt*M_PI*2.0);
if(fabs(ch)>0.1&&fabs(diff)<0.5)
{
rxf+=ch;
setspinval(G.rxf, floor(rxf+.5));
}
}
t_da=0;
b_da[0]=-1;
b_da[1]=1;
}
if(bitbufp>=BITBUFLEN)
{
bitbufp--;
for(unsigned int i=0;i<bitbufp;i++)
bitbuf[i]=bitbuf[i+1];
}
bitbuf[bitbufp++]=(da>0);
int ubits=0;
char *text=decode((bbuf){.nbits=bitbufp, .data=bitbuf}, &ubits);
if(*text)
{
size_t tp=strlen(G.outtext[OUTLINES-1]);
for(const char *p=text;*p;p++)
{
if(textout) putchar(*p);
if((*p=='\n')||(tp>OUTLINELEN))
{
for(unsigned int i=0;i<OUTLINES-1;i++)
strcpy(G.outtext[i], G.outtext[i+1]);
G.outtext[OUTLINES-1][0]=' ';
G.outtext[OUTLINES-1][1]=0;
tp=1;
}
if(*p=='\t')
{
G.outtext[OUTLINES-1][tp++]=' ';
while((tp<OUTLINELEN)&&((tp-1)&3))
G.outtext[OUTLINES-1][tp++]=' ';
G.outtext[OUTLINES-1][tp]=0;
}
else if(*p!='\n')
{
G.outtext[OUTLINES-1][tp++]=*p;
G.outtext[OUTLINES-1][tp]=0;
}
}
}
bitbufp-=ubits;
for(unsigned int i=0;i<bitbufp;i++)
bitbuf[i]=bitbuf[i+ubits];
free(text);
}
pset(G.constel_img, x, y, green?(atg_colour){0, 255, 0, ATG_ALPHA_OPAQUE}:(atg_colour){255, 0, 0, ATG_ALPHA_OPAQUE});
frame++;
if(t>lastflip)
{
lastflip+=sample_rate/8;
if(G.spl) *G.spl=(rxf!=txf(G));
if(G.underrun[0]) *G.underrun[0]=txaud.underrun;
if(G.underrun[1]) *G.underrun[1]=rxaud.underrun;
if(G.ingi>((INLINES+1)*INLINELEN))
{
G.ingi-=INLINELEN;
memmove(G.ing, G.ing+INLINELEN, G.ingi);
}
for(unsigned int i=0;i<INLINES;i++)
G.intextleft[i][0]=G.intextright[i][0]=0;
unsigned int x=0,y=0;
for(size_t p=0;p<G.ingi;p++)
{
G.intextleft[y][x++]=G.ing[p];
G.intextleft[y][x]=0;
if((G.ing[p]=='\n')||(x>=INLINELEN))
{
if(y<INLINES-1)
y++;
else
{
for(unsigned int i=0;i<y;i++)
strcpy(G.intextleft[i], G.intextleft[i+1]);
G.intextleft[y][0]=0;
}
x=0;
}
}
unsigned int sx=0;
for(size_t p=0;p<G.inri;p++)
{
x++;
G.intextright[y][sx++]=G.inr[p];
G.intextright[y][sx]=0;
if((G.inr[p]=='\n')||(x>=INLINELEN))
{
if(y<INLINES-1)
y++;
else
{
for(unsigned int i=0;i<y;i++)
{
strcpy(G.intextleft[i], G.intextleft[i+1]);
strcpy(G.intextright[i], G.intextright[i+1]);
}
G.intextleft[y][0]=G.intextright[y][0]=0;
}
x=sx=0;
}
}
for(unsigned int i=0;i<NMACROS;i++)
*G.mcol[i]=(i==inp)?(atg_colour){63, 63, 47, ATG_ALPHA_OPAQUE}:(atg_colour){23, 23, 23, ATG_ALPHA_OPAQUE};
atg_flip(G.canvas);
atg_event e;
while(atg_poll_event(&e, G.canvas))
{
switch(e.type)
{
case ATG_EV_RAW:;
SDL_Event s=e.event.raw;