2 Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <boost/bind.hpp>
22 #include <wx/graphics.h>
23 #include "audio_plot.h"
24 #include "lib/decoder_factory.h"
25 #include "lib/audio_decoder.h"
26 #include "lib/audio_analysis.h"
27 #include "wx/wx_util.h"
35 using boost::shared_ptr;
37 int const AudioPlot::_minimum = -70;
38 int const AudioPlot::max_smoothing = 128;
40 AudioPlot::AudioPlot (wxWindow* parent)
43 , _smoothing (max_smoothing / 2)
45 SetDoubleBuffered (true);
47 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
48 _channel_visible[i] = false;
51 for (int i = 0; i < AudioPoint::COUNT; ++i) {
52 _type_visible[i] = false;
55 _colours.push_back (wxColour ( 0, 0, 0));
56 _colours.push_back (wxColour (255, 0, 0));
57 _colours.push_back (wxColour ( 0, 255, 0));
58 _colours.push_back (wxColour (139, 0, 204));
59 _colours.push_back (wxColour ( 0, 0, 255));
60 _colours.push_back (wxColour (100, 100, 100));
62 Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (AudioPlot::paint), 0, this);
64 SetMinSize (wxSize (640, 512));
68 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
72 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
73 _channel_visible[i] = false;
76 for (int i = 0; i < AudioPoint::COUNT; ++i) {
77 _type_visible[i] = false;
84 AudioPlot::set_channel_visible (int c, bool v)
86 _channel_visible[c] = v;
91 AudioPlot::set_type_visible (int t, bool v)
98 AudioPlot::paint (wxPaintEvent &)
102 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
107 if (!_analysis || _analysis->channels() == 0) {
108 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
109 gc->DrawText (_("Please wait; audio is being analysed..."), 32, 32);
113 wxGraphicsPath grid = gc->CreatePath ();
114 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
115 wxDouble db_label_height;
116 wxDouble db_label_descent;
117 wxDouble db_label_leading;
118 gc->GetTextExtent (_("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
120 _db_label_width += 8;
122 int const data_width = GetSize().GetWidth() - _db_label_width;
123 /* Assume all channels have the same number of points */
124 _x_scale = data_width / float (_analysis->points (0));
125 _height = GetSize().GetHeight ();
127 _y_scale = (_height - _y_origin) / -_minimum;
129 for (int i = _minimum; i <= 0; i += 10) {
130 int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
131 grid.MoveToPoint (_db_label_width - 4, y);
132 grid.AddLineToPoint (_db_label_width + data_width, y);
133 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
136 gc->SetPen (*wxLIGHT_GREY_PEN);
137 gc->StrokePath (grid);
139 gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
142 if (_type_visible[AudioPoint::PEAK]) {
143 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
144 wxGraphicsPath p = gc->CreatePath ();
145 if (_channel_visible[c] && c < _analysis->channels()) {
148 wxColour const col = _colours[c];
149 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2)));
154 if (_type_visible[AudioPoint::RMS]) {
155 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
156 wxGraphicsPath p = gc->CreatePath ();
157 if (_channel_visible[c] && c < _analysis->channels()) {
160 wxColour const col = _colours[c];
161 gc->SetPen (*wxThePenList->FindOrCreatePen (col));
166 wxGraphicsPath axes = gc->CreatePath ();
167 axes.MoveToPoint (_db_label_width, 0);
168 axes.AddLineToPoint (_db_label_width, _height - _y_origin);
169 axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
170 gc->SetPen (*wxBLACK_PEN);
171 gc->StrokePath (axes);
177 AudioPlot::y_for_linear (float p) const
179 return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
183 AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
185 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
188 int const N = _analysis->points(channel);
189 for (int i = 0; i < N; ++i) {
190 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
191 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
194 } else if (peak < 0) {
198 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
203 AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
205 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
207 list<float> smoothing;
208 int const N = _analysis->points(channel);
209 for (int i = 0; i < N; ++i) {
211 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
212 if (int(smoothing.size()) > _smoothing) {
213 smoothing.pop_front ();
217 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
221 p = sqrt (p / smoothing.size ());
223 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
228 AudioPlot::set_gain (float g)
235 AudioPlot::set_smoothing (int s)