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)
41 , _smoothing (max_smoothing / 2)
44 SetDoubleBuffered (true);
47 for (int i = 0; i < MAX_DCP_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 ( 0, 139, 0));
61 _colours.push_back (wxColour ( 0, 0, 139));
62 _colours.push_back (wxColour (255, 255, 0));
63 _colours.push_back (wxColour ( 0, 255, 255));
64 _colours.push_back (wxColour (255, 0, 255));
65 _colours.push_back (wxColour (255, 0, 139));
66 _colours.push_back (wxColour (139, 0, 255));
68 set_analysis (shared_ptr<AudioAnalysis> ());
70 #if MAX_DCP_AUDIO_CHANNELS != 12
71 #warning AudioPlot::AudioPlot is expecting the wrong MAX_DCP_AUDIO_CHANNELS
74 Bind (wxEVT_PAINT, boost::bind (&AudioPlot::paint, this));
76 SetMinSize (wxSize (640, 512));
80 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
85 _message = _("Please wait; audio is being analysed...");
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)
114 double db_label_width;
126 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
131 if (!_analysis || _analysis->channels() == 0) {
132 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
133 gc->DrawText (_message, 32, 32);
137 wxGraphicsPath grid = gc->CreatePath ();
138 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
139 wxDouble db_label_height;
140 wxDouble db_label_descent;
141 wxDouble db_label_leading;
143 gc->GetTextExtent (wxT ("-80dB"), &metrics.db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
145 metrics.db_label_width += 8;
147 int const data_width = GetSize().GetWidth() - metrics.db_label_width;
148 /* Assume all channels have the same number of points */
149 metrics.x_scale = data_width / float (_analysis->points (0));
150 metrics.height = GetSize().GetHeight ();
151 metrics.y_origin = 32;
152 metrics.y_scale = (metrics.height - metrics.y_origin) / -_minimum;
154 for (int i = _minimum; i <= 0; i += 10) {
155 int const y = (metrics.height - (i - _minimum) * metrics.y_scale) - metrics.y_origin;
156 grid.MoveToPoint (metrics.db_label_width - 4, y);
157 grid.AddLineToPoint (metrics.db_label_width + data_width, y);
158 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
161 gc->SetPen (wxPen (wxColour (200, 200, 200)));
162 gc->StrokePath (grid);
164 gc->DrawText (_("Time"), data_width, metrics.height - metrics.y_origin + db_label_height / 2);
166 if (_type_visible[AudioPoint::PEAK]) {
167 for (int c = 0; c < MAX_DCP_AUDIO_CHANNELS; ++c) {
168 wxGraphicsPath p = gc->CreatePath ();
169 if (_channel_visible[c] && c < _analysis->channels()) {
170 plot_peak (p, c, metrics);
172 wxColour const col = _colours[c];
173 gc->SetPen (wxPen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
178 if (_type_visible[AudioPoint::RMS]) {
179 for (int c = 0; c < MAX_DCP_AUDIO_CHANNELS; ++c) {
180 wxGraphicsPath p = gc->CreatePath ();
181 if (_channel_visible[c] && c < _analysis->channels()) {
182 plot_rms (p, c, metrics);
184 wxColour const col = _colours[c];
185 gc->SetPen (wxPen (col, 1, wxPENSTYLE_SOLID));
190 wxGraphicsPath axes = gc->CreatePath ();
191 axes.MoveToPoint (metrics.db_label_width, 0);
192 axes.AddLineToPoint (metrics.db_label_width, metrics.height - metrics.y_origin);
193 axes.AddLineToPoint (metrics.db_label_width + data_width, metrics.height - metrics.y_origin);
194 gc->SetPen (wxPen (wxColour (0, 0, 0)));
195 gc->StrokePath (axes);
201 AudioPlot::y_for_linear (float p, Metrics const & metrics) const
207 return metrics.height - (20 * log10(p) - _minimum) * metrics.y_scale - metrics.y_origin;
211 AudioPlot::plot_peak (wxGraphicsPath& path, int channel, Metrics const & metrics) const
213 if (_analysis->points (channel) == 0) {
217 path.MoveToPoint (metrics.db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK], metrics));
220 int const N = _analysis->points(channel);
221 for (int i = 0; i < N; ++i) {
222 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
223 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
226 } else if (peak < 0) {
230 path.AddLineToPoint (metrics.db_label_width + i * metrics.x_scale, y_for_linear (peak, metrics));
235 AudioPlot::plot_rms (wxGraphicsPath& path, int channel, Metrics const & metrics) const
237 if (_analysis->points (channel) == 0) {
241 path.MoveToPoint (metrics.db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS], metrics));
243 list<float> smoothing;
245 int const N = _analysis->points(channel);
247 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
248 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
250 int const before = _smoothing / 2;
251 int const after = _smoothing - before;
253 /* Pre-load the smoothing list */
254 for (int i = 0; i < before; ++i) {
255 smoothing.push_back (first);
257 for (int i = 0; i < after; ++i) {
259 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
261 smoothing.push_back (last);
265 for (int i = 0; i < N; ++i) {
267 int const next_for_window = i + after;
269 if (next_for_window < N) {
270 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
272 smoothing.push_back (last);
275 smoothing.pop_front ();
278 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
282 if (!smoothing.empty ()) {
283 p = sqrt (p / smoothing.size ());
286 path.AddLineToPoint (metrics.db_label_width + i * metrics.x_scale, y_for_linear (p, metrics));
291 AudioPlot::set_smoothing (int s)