using std::cout;
using std::vector;
+using std::list;
using std::max;
using std::min;
using boost::bind;
using boost::shared_ptr;
-int const AudioPlot::_minimum = -90;
+int const AudioPlot::_minimum = -70;
+int const AudioPlot::max_smoothing = 128;
AudioPlot::AudioPlot (wxWindow* parent)
: wxPanel (parent)
, _gain (0)
+ , _smoothing (max_smoothing / 2)
{
SetDoubleBuffered (true);
return;
}
- if (!_analysis) {
+ if (!_analysis || _analysis->channels() == 0) {
gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
gc->DrawText (_("Please wait; audio is being analysed..."), 32, 32);
return;
wxGraphicsPath grid = gc->CreatePath ();
gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
- wxDouble db_label_width;
wxDouble db_label_height;
wxDouble db_label_descent;
wxDouble db_label_leading;
- gc->GetTextExtent (_("-80dB"), &db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
+ gc->GetTextExtent (wxT ("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
- db_label_width += 8;
+ _db_label_width += 8;
- int const data_width = GetSize().GetWidth() - db_label_width;
+ int const data_width = GetSize().GetWidth() - _db_label_width;
/* Assume all channels have the same number of points */
- float const xs = data_width / float (_analysis->points (0));
- int const height = GetSize().GetHeight ();
- int const yo = 32;
- float const ys = (height - yo) / -_minimum;
+ _x_scale = data_width / float (_analysis->points (0));
+ _height = GetSize().GetHeight ();
+ _y_origin = 32;
+ _y_scale = (_height - _y_origin) / -_minimum;
for (int i = _minimum; i <= 0; i += 10) {
- int const y = (height - (i - _minimum) * ys) - yo;
- grid.MoveToPoint (db_label_width - 4, y);
- grid.AddLineToPoint (db_label_width + data_width, y);
+ int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
+ grid.MoveToPoint (_db_label_width - 4, y);
+ grid.AddLineToPoint (_db_label_width + data_width, y);
gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
}
+
gc->SetPen (*wxLIGHT_GREY_PEN);
gc->StrokePath (grid);
- for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
- if (!_channel_visible[c] || c >= _analysis->channels()) {
- continue;
- }
+ gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
- wxGraphicsPath path[AudioPoint::COUNT];
-
- for (int i = 0; i < AudioPoint::COUNT; ++i) {
- if (!_type_visible[i]) {
- continue;
+
+ if (_type_visible[AudioPoint::PEAK]) {
+ for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
+ wxGraphicsPath p = gc->CreatePath ();
+ if (_channel_visible[c] && c < _analysis->channels()) {
+ plot_peak (p, c);
}
-
- path[i] = gc->CreatePath ();
- path[i].MoveToPoint (
- db_label_width,
- height - (max (_analysis->get_point(c, 0)[i], float (_minimum)) - _minimum + _gain) * ys - yo
- );
+ wxColour const col = _colours[c];
+#if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
+ gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
+#else
+ gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxSOLID));
+#endif
+ gc->StrokePath (p);
}
+ }
- for (int i = 0; i < _analysis->points(c); ++i) {
- for (int j = 0; j < AudioPoint::COUNT; ++j) {
- if (!_type_visible[j]) {
- continue;
- }
-
- path[j].AddLineToPoint (
- i * xs + db_label_width,
- height - (max (_analysis->get_point(c, i)[j], float (_minimum)) - _minimum + _gain) * ys - yo
- );
+ if (_type_visible[AudioPoint::RMS]) {
+ for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
+ wxGraphicsPath p = gc->CreatePath ();
+ if (_channel_visible[c] && c < _analysis->channels()) {
+ plot_rms (p, c);
}
+ wxColour const col = _colours[c];
+#if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
+ gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
+#else
+ gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxSOLID));
+#endif
+ gc->StrokePath (p);
}
+ }
- wxColour const col = _colours[c];
+ wxGraphicsPath axes = gc->CreatePath ();
+ axes.MoveToPoint (_db_label_width, 0);
+ axes.AddLineToPoint (_db_label_width, _height - _y_origin);
+ axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
+ gc->SetPen (*wxBLACK_PEN);
+ gc->StrokePath (axes);
+
+ delete gc;
+}
- if (_type_visible[AudioPoint::RMS]) {
- gc->SetPen (*wxThePenList->FindOrCreatePen (col));
- gc->StrokePath (path[AudioPoint::RMS]);
+float
+AudioPlot::y_for_linear (float p) const
+{
+ return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
+}
+
+void
+AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
+{
+ path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
+
+ float peak = 0;
+ int const N = _analysis->points(channel);
+ for (int i = 0; i < N; ++i) {
+ float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
+ peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
+ if (p > peak) {
+ peak = p;
+ } else if (peak < 0) {
+ peak = 0;
}
+
+ path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
+ }
+}
+
+void
+AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
+{
+ path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
+
+ list<float> smoothing;
+
+ int const N = _analysis->points(channel);
- if (_type_visible[AudioPoint::PEAK]) {
- gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2)));
- gc->StrokePath (path[AudioPoint::PEAK]);
+ float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
+ float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
+
+ int const before = _smoothing / 2;
+ int const after = _smoothing - before;
+
+ /* Pre-load the smoothing list */
+ for (int i = 0; i < before; ++i) {
+ smoothing.push_back (first);
+ }
+ for (int i = 0; i < after; ++i) {
+ if (i < N) {
+ smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
+ } else {
+ smoothing.push_back (last);
}
}
+
+ for (int i = 0; i < N; ++i) {
- wxGraphicsPath axes = gc->CreatePath ();
- axes.MoveToPoint (db_label_width, 0);
- axes.AddLineToPoint (db_label_width, height - yo);
- axes.AddLineToPoint (db_label_width + data_width, height - yo);
- gc->SetPen (*wxBLACK_PEN);
- gc->StrokePath (axes);
+ int const next_for_window = i + after;
- delete gc;
+ if (next_for_window < N) {
+ smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
+ } else {
+ smoothing.push_back (last);
+ }
+
+ smoothing.pop_front ();
+
+ float p = 0;
+ for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
+ p += pow (*j, 2);
+ }
+
+ p = sqrt (p / smoothing.size ());
+
+ path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
+ }
}
void
_gain = g;
Refresh ();
}
+
+void
+AudioPlot::set_smoothing (int s)
+{
+ _smoothing = s;
+ Refresh ();
+}