1 files changed, 220 insertions, 0 deletions
diff --git a/src/wx/audio_plot.cc b/src/wx/audio_plot.cc
new file mode 100644
index 000000000..d938d0c27
--- /dev/null
+++ b/src/wx/audio_plot.cc
@@ -0,0 +1,220 @@
+/*
+    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <iostream>
+#include <boost/bind.hpp>
+#include <wx/graphics.h>
+#include "audio_plot.h"
+#include "lib/decoder_factory.h"
+#include "lib/audio_decoder.h"
+#include "lib/audio_analysis.h"
+#include "wx/wx_util.h"
+
+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 = -70;
+
+AudioPlot::AudioPlot (wxWindow* parent)
+	: wxPanel (parent)
+	, _gain (0)
+	, _smoothing (1)
+{
+	SetDoubleBuffered (true);
+
+	for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
+		_channel_visible[i] = false;
+	}
+
+	for (int i = 0; i < AudioPoint::COUNT; ++i) {
+		_type_visible[i] = false;
+	}
+
+	_colours.push_back (wxColour (  0,   0,   0));
+	_colours.push_back (wxColour (255,   0,   0));
+	_colours.push_back (wxColour (  0, 255,   0));
+	_colours.push_back (wxColour (139,   0, 204));
+	_colours.push_back (wxColour (  0,   0, 255));
+	_colours.push_back (wxColour (100, 100, 100));
+	
+	Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (AudioPlot::paint), 0, this);
+	
+	SetMinSize (wxSize (640, 512));
+}
+
+void
+AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
+{
+	_analysis = a;
+
+	for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
+		_channel_visible[i] = false;
+	}
+
+	for (int i = 0; i < AudioPoint::COUNT; ++i) {
+		_type_visible[i] = false;
+	}
+	
+	Refresh ();
+}
+
+void
+AudioPlot::set_channel_visible (int c, bool v)
+{
+	_channel_visible[c] = v;
+	Refresh ();
+}
+
+void
+AudioPlot::set_type_visible (int t, bool v)
+{
+	_type_visible[t] = v;
+	Refresh ();
+}
+
+void
+AudioPlot::paint (wxPaintEvent &)
+{
+	wxPaintDC dc (this);
+
+	wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
+	if (!gc) {
+		return;
+	}
+
+	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);
+
+	db_label_width += 8;
+	
+	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;
+
+	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);
+		gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
+	}
+
+	gc->SetPen (*wxLIGHT_GREY_PEN);
+	gc->StrokePath (grid);
+
+	gc->DrawText (_("Time"), data_width, height - yo + db_label_height / 2);
+
+	for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
+		if (!_channel_visible[c] || c >= _analysis->channels()) {
+			continue;
+		}
+
+		wxGraphicsPath path[AudioPoint::COUNT];
+		
+		for (int i = 0; i < AudioPoint::COUNT; ++i) {
+			if (!_type_visible[i]) {
+				continue;
+			}
+			
+			path[i] = gc->CreatePath ();
+
+			float const val = 20 * log10 (_analysis->get_point(c, 0)[i]);
+			
+			path[i].MoveToPoint (
+				db_label_width,
+				height - (max (val, float (_minimum)) - _minimum + _gain) * ys - yo
+				);
+		}
+
+		list<float> smoothing[AudioPoint::COUNT];
+
+		for (int i = 0; i < _analysis->points(c); ++i) {
+			for (int j = 0; j < AudioPoint::COUNT; ++j) {
+				if (!_type_visible[j]) {
+					continue;
+				}
+
+				smoothing[j].push_back (_analysis->get_point(c, i)[j]);
+				if (int(smoothing[j].size()) > _smoothing) {
+					smoothing[j].pop_front ();
+				}
+
+				float const val = 20 * log10 (_analysis->smooth (smoothing[j], static_cast<AudioPoint::Type> (j)));
+				
+				path[j].AddLineToPoint (
+					i * xs + db_label_width,
+					height - (max (val, float (_minimum)) - _minimum + _gain) * ys - yo
+					);
+			}
+		}
+
+		wxColour const col = _colours[c];
+
+		if (_type_visible[AudioPoint::RMS]) {
+			gc->SetPen (*wxThePenList->FindOrCreatePen (col));
+			gc->StrokePath (path[AudioPoint::RMS]);
+		}
+
+		if (_type_visible[AudioPoint::PEAK]) {
+			gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2)));
+			gc->StrokePath (path[AudioPoint::PEAK]);
+		}
+	}
+
+	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);
+
+	delete gc;
+}
+
+void
+AudioPlot::set_gain (float g)
+{
+	_gain = g;
+	Refresh ();
+}
+
+void
+AudioPlot::set_smoothing (int s)
+{
+	_smoothing = s;
+	Refresh ();
+}