const double start_time = _data->get_start_time();
const int64_t last_sample = snapshot->get_sample_count() - 1;
const double samples_per_pixel = samplerate * scale;
const double start = samplerate * (offset - start_time);
const double start_time = _data->get_start_time();
const int64_t last_sample = snapshot->get_sample_count() - 1;
const double samples_per_pixel = samplerate * scale;
const double start = samplerate * (offset - start_time);