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using namespace std;
#include <iostream>
#include <iomanip>
#include <unistd.h>
#include "refout.h"
#include "lockin.h"
#include "gui.h"
#include <alsa/asoundlib.h>
#ifdef TUNER
# include <sys/ioctl.h> /* for ioctl, TCGETA */
# include <termios.h> /* for ECHO */
#endif
datum smash(double foo) {
if (foo > INT_MAX) return INT_MAX;
if (foo < -INT_MAX) return -INT_MAX;
return datum(foo);
}
#ifdef TUNER
int fn = fileno(stdin);
string kbd("\t1q2we4r5t6yu8i9op-[=]");
string keymap("C+D+EF+G+A+BC");
const double halfstep(pow(2.0, 1.0/12.0));
int octave(4);
int kbkey(9); // A4 = 440 Hz
int abskey(57);
void dokey(int newkey){
abskey = newkey;
ofreq = 440*pow(halfstep, abskey-57);
int myoct = abskey / 12;
int mykey = abskey - myoct*12;
string keyname;
char keylet = keymap[mykey];
if (keylet == '+') {
keyname += keymap[mykey-1];
keyname += '#';
} else keyname += keylet;
fprintf(stderr, "\r\033[K %2s%1d %6.2f\r", keyname.c_str(), myoct, ofreq);
fflush(stderr);
}
int escmode(0);
void chkey(){
char cc;
int nn = read(fn, &cc, 1);
if (nn <= 0) return;
if (cc == 033) {
escmode = 1;
return;
}
if (escmode) {
if (cc == '~') escmode = 0;
if (cc != 'O' && isupper(cc)) escmode = 0;
if (cc == 'B' || cc == 'D') dokey(abskey-1);
else if (cc == 'A' || cc == 'C') dokey(abskey+1);
return;
}
string::size_type where = kbd.find(cc);
if (where != kbd.npos) {
kbkey = where;
} else if (cc == ',') {
octave--;
if (octave < 0) octave = 0;
} else if (cc == '.') {
octave++;
if (octave > 8) octave = 8;
} else {
int foo;
foo = cc;
fprintf(stderr, "%04o\n", foo);
return;
}
dokey(12*octave + kbkey);
}
void setkey(){
kbd += char(127); // the "backspace" key
kbd += '\\';
kbd += char(10); // the "return" key
}
#else
inline void chkey(){} // does nothing
inline void setkey(){} // does nothing
#endif
void* refout(void* _arg){
ref_arg* arg = (ref_arg*) _arg;
setkey(); // FIXME (doesn't do anything at the moment)
double reftime = .2; // # of seconds in output buffer
int refframe = int(arg->pcm->rate * reftime); // # of frames
int bufsize(refframe * arg->pcm->nchan);
if (verbosity) cerr << "Refout starts, ofreq: " << actOutFreq
<< " INT_MAX: " << INT_MAX
<< " sizeof(datum): " << sizeof(datum)
<< " refframe: " << refframe
<< " bufsize: " << bufsize
<< endl;
#ifdef TUNER
{
termio save;
// If ioctl fails, we're probably not connected to a terminal.
int rslt;
rslt = ioctl(fn, TCGETA, &save);
termio t(save);
t.c_lflag &= ~ECHO;
t.c_lflag &= ~ICANON;
t.c_cc[VMIN] = 1;
t.c_cc[VTIME] = 0;
t.c_cc[VERASE] = 0;
ioctl(fn, TCSETA, &t);
int temp(1);
ioctl(fn, FIONBIO, &temp);
}
#endif
Keeper keep(arg->pcm, FPP);
datum* ptr;
datum foo[2];
int flip;
/////////////////
// main refout loop
//
// this is a SINGLE loop over TWO variables;
// the cap_buffer is emptied in units of refframe
// and filled in units of fpkp.
// Parallel code appears in krunch.cxx
valarray<datum> refout_buffer(bufsize);
int out_idx(0);
int ref_end(fpkp);
int ref_idx(0);
double theta0(0);
double theta1(0);
double old_cpkp(0), old_fpkp(0);
double dtheta0(0);
double dtheta1(0);
int kperno(0);
for (;;) { // loop over all samples
// loop control for output (write) process
if (out_idx >= refframe) {
int todo = out_idx;
out_idx = 0;
datum* obuf_ptr(&refout_buffer[0]);
while (todo) { // keep trying to get this buffer out
int rslt = snd_pcm_writei(keep, obuf_ptr, todo);
if (rslt == todo) break; // good!
if (rslt > 0) { // short write = harmless
// but should be rare
cout << "Refout: short write; probably harmless." << endl;
todo -= rslt;
obuf_ptr += rslt;
continue;
}
if (rslt == -EPIPE) { // explicit underrrun
if (xrun_verbosity) fprintf(stderr,
"Refout underrun: wrote %d got %d" NL, todo, rslt);
snd_pcm_prepare(arg->pcm->phndl); // recover from underruns
continue;
}
// some error we don't understand
fprintf(stderr, "Refout wrote %d got %d" NL, todo, rslt);
snd_pcm_prepare(arg->pcm->phndl); // try to recover
}
}
// Loop control for reference process.
// Note that dtheta0 only changes at the boundary
// between krunch periods.
if (ref_idx == ref_end) {
theta0 = 0.;
// theta1 is free-running
ref_idx = 0;
ref_end = fpkp;
dtheta0 = 2. * M_PI * cpkp / fpkp;
// cpkp == cycles per krunch period
// fpkp == frames per krunch period
if (old_cpkp != cpkp || old_fpkp != fpkp){
if (verbosity > 0) {
cout.precision(6);
cout << fixed;
double freq = arg->pcm->rate / fpkp * cpkp;
cout << "Refout switching to: " << freq
<< setprecision(1)
<< " cpkp: " << cpkp
<< " fpkp: " << fpkp
<< " dtheta: " << setprecision(20) << dtheta0
<< " rate: " << arg->pcm->rate
<< endl;
}
old_cpkp = cpkp;
old_fpkp = fpkp;
}
}
if (ref_idx == 0) {
ref_to_krunch kper(kperno, int(cpkp), int(fpkp));
int didwrite = write(arg->pipefd, &kper, sizeof(kper));
if (didwrite != sizeof(kper)) {
fprintf(stderr, "refout: write to pipe failed:");
perror(0);
exeunt(1);
}
kperno++;
}
dtheta1 = dtheta0 * arg->ival;
chkey(); // FIXME
double expo((refOutAmp_dB - VoCal_dB)/20);
if (expo > 100) expo = 100;
double gainFactor(pow(10, expo));
double amplitude(full_swing * gainFactor);
foo[0] = smash(amplitude * cos(theta0));
foo[1] = smash(amplitude * cos(theta1));
// Fill all channels in frame (not just the first two):
ptr = &refout_buffer[out_idx * arg->pcm->nchan];
for (unsigned int jj = 0; jj < arg->pcm->nchan; jj++) {
flip = jj & 1; // copy foo[0] or foo[1]
*ptr++ = foo[flip];
}
theta0 += dtheta0;
theta1 += dtheta1;
out_idx++;
ref_idx++;
}
return 0;
}
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