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/audio_decoder.h"
25 #include "lib/audio_analysis.h"
26 #include "wx/wx_util.h"
34 using boost::shared_ptr;
36 int const AudioPlot::_minimum = -70;
37 int const AudioPlot::max_smoothing = 128;
39 AudioPlot::AudioPlot (wxWindow* parent)
40 : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
42 , _smoothing (max_smoothing / 2)
43 , _message (_("Please wait; audio is being analysed..."))
46 SetDoubleBuffered (true);
49 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
50 _channel_visible[i] = false;
53 for (int i = 0; i < AudioPoint::COUNT; ++i) {
54 _type_visible[i] = false;
57 _colours.push_back (wxColour ( 0, 0, 0));
58 _colours.push_back (wxColour (255, 0, 0));
59 _colours.push_back (wxColour ( 0, 255, 0));
60 _colours.push_back (wxColour (139, 0, 204));
61 _colours.push_back (wxColour ( 0, 0, 255));
62 _colours.push_back (wxColour ( 0, 139, 0));
63 _colours.push_back (wxColour ( 0, 0, 139));
64 _colours.push_back (wxColour (255, 255, 0));
66 #if MAX_AUDIO_CHANNELS != 8
67 #warning AudioPlot::AudioPlot is expecting the wrong MAX_AUDIO_CHANNELS
70 Bind (wxEVT_PAINT, boost::bind (&AudioPlot::paint, this));
72 SetMinSize (wxSize (640, 512));
76 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
80 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
81 _channel_visible[i] = false;
84 for (int i = 0; i < AudioPoint::COUNT; ++i) {
85 _type_visible[i] = false;
92 AudioPlot::set_channel_visible (int c, bool v)
94 _channel_visible[c] = v;
99 AudioPlot::set_type_visible (int t, bool v)
101 _type_visible[t] = v;
106 AudioPlot::set_message (wxString s)
117 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
122 if (!_analysis || _analysis->channels() == 0) {
123 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
124 gc->DrawText (_message, 32, 32);
128 wxGraphicsPath grid = gc->CreatePath ();
129 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
130 wxDouble db_label_height;
131 wxDouble db_label_descent;
132 wxDouble db_label_leading;
133 gc->GetTextExtent (wxT ("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
135 _db_label_width += 8;
137 int const data_width = GetSize().GetWidth() - _db_label_width;
138 /* Assume all channels have the same number of points */
139 _x_scale = data_width / float (_analysis->points (0));
140 _height = GetSize().GetHeight ();
142 _y_scale = (_height - _y_origin) / -_minimum;
144 for (int i = _minimum; i <= 0; i += 10) {
145 int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
146 grid.MoveToPoint (_db_label_width - 4, y);
147 grid.AddLineToPoint (_db_label_width + data_width, y);
148 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
151 gc->SetPen (*wxLIGHT_GREY_PEN);
152 gc->StrokePath (grid);
154 gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
156 if (_type_visible[AudioPoint::PEAK]) {
157 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
158 wxGraphicsPath p = gc->CreatePath ();
159 if (_channel_visible[c] && c < _analysis->channels()) {
162 wxColour const col = _colours[c];
163 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
168 if (_type_visible[AudioPoint::RMS]) {
169 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
170 wxGraphicsPath p = gc->CreatePath ();
171 if (_channel_visible[c] && c < _analysis->channels()) {
174 wxColour const col = _colours[c];
175 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
180 wxGraphicsPath axes = gc->CreatePath ();
181 axes.MoveToPoint (_db_label_width, 0);
182 axes.AddLineToPoint (_db_label_width, _height - _y_origin);
183 axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
184 gc->SetPen (*wxBLACK_PEN);
185 gc->StrokePath (axes);
191 AudioPlot::y_for_linear (float p) const
193 return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
197 AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
199 if (_analysis->points (channel) == 0) {
203 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
206 int const N = _analysis->points(channel);
207 for (int i = 0; i < N; ++i) {
208 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
209 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
212 } else if (peak < 0) {
216 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
221 AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
223 if (_analysis->points (channel) == 0) {
227 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
229 list<float> smoothing;
231 int const N = _analysis->points(channel);
233 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
234 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
236 int const before = _smoothing / 2;
237 int const after = _smoothing - before;
239 /* Pre-load the smoothing list */
240 for (int i = 0; i < before; ++i) {
241 smoothing.push_back (first);
243 for (int i = 0; i < after; ++i) {
245 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
247 smoothing.push_back (last);
251 for (int i = 0; i < N; ++i) {
253 int const next_for_window = i + after;
255 if (next_for_window < N) {
256 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
258 smoothing.push_back (last);
261 smoothing.pop_front ();
264 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
268 if (smoothing.size() > 0) {
269 p = sqrt (p / smoothing.size ());
272 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
277 AudioPlot::set_gain (float g)
284 AudioPlot::set_smoothing (int s)