const double samples_per_pixel = samplerate * pp.scale();
const double pixels_per_sample = 1 / samples_per_pixel;
const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
const double samples_per_pixel = samplerate * pp.scale();
const double pixels_per_sample = 1 / samples_per_pixel;
const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);