+static std::string format_hz (float freq) {
+ std::stringstream ss;
+ if (freq >= 10000) {
+ ss << std::setprecision (1) << std::fixed << freq / 1000 << "KHz";
+ } else if (freq >= 1000) {
+ ss << std::setprecision (2) << std::fixed << freq / 1000 << "KHz";
+ } else {
+ ss << std::setprecision (1) << std::fixed << freq << "Hz";
+ }
+ return ss.str ();
+}
+
+static size_t fit_wave (float freq, float rate, float precision = 0.001) {
+ const size_t max_mult = floor (freq * rate);
+ float minErr = 2;
+ size_t fact = 1;
+ for (size_t i = 1; i < max_mult; ++i) {
+ const float isc = rate * (float)i / freq; // ideal sample count
+ const float rsc = rintf (isc); // rounded sample count
+ const float err = fabsf (isc - rsc);
+ if (err < minErr) {
+ minErr = err;
+ fact = i;
+ }
+ if (err < precision) {
+ break;
+ }
+ }
+ //printf(" FIT %8.1f Hz / %8.1f Hz * %ld = %.0f (err: %e)\n", freq, rate, fact, fact * rate / freq, minErr);
+ return fact;
+}
+
+std::string
+DummyAudioPort::setup_generator (GeneratorType const g, float const samplerate, int c, int total)