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)
42 , _smoothing (max_smoothing / 2)
44 SetDoubleBuffered (true);
46 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
47 _channel_visible[i] = false;
50 for (int i = 0; i < AudioPoint::COUNT; ++i) {
51 _type_visible[i] = false;
54 _colours.push_back (wxColour ( 0, 0, 0));
55 _colours.push_back (wxColour (255, 0, 0));
56 _colours.push_back (wxColour ( 0, 255, 0));
57 _colours.push_back (wxColour (139, 0, 204));
58 _colours.push_back (wxColour ( 0, 0, 255));
59 _colours.push_back (wxColour (100, 100, 100));
61 Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (AudioPlot::paint), 0, this);
63 SetMinSize (wxSize (640, 512));
67 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
71 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
72 _channel_visible[i] = false;
75 for (int i = 0; i < AudioPoint::COUNT; ++i) {
76 _type_visible[i] = false;
83 AudioPlot::set_channel_visible (int c, bool v)
85 _channel_visible[c] = v;
90 AudioPlot::set_type_visible (int t, bool v)
97 AudioPlot::paint (wxPaintEvent &)
101 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
106 if (!_analysis || _analysis->channels() == 0) {
107 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
108 gc->DrawText (_("Please wait; audio is being analysed..."), 32, 32);
112 wxGraphicsPath grid = gc->CreatePath ();
113 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
114 wxDouble db_label_height;
115 wxDouble db_label_descent;
116 wxDouble db_label_leading;
117 gc->GetTextExtent (wxT ("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
119 _db_label_width += 8;
121 int const data_width = GetSize().GetWidth() - _db_label_width;
122 /* Assume all channels have the same number of points */
123 _x_scale = data_width / float (_analysis->points (0));
124 _height = GetSize().GetHeight ();
126 _y_scale = (_height - _y_origin) / -_minimum;
128 for (int i = _minimum; i <= 0; i += 10) {
129 int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
130 grid.MoveToPoint (_db_label_width - 4, y);
131 grid.AddLineToPoint (_db_label_width + data_width, y);
132 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
135 gc->SetPen (*wxLIGHT_GREY_PEN);
136 gc->StrokePath (grid);
138 gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
141 if (_type_visible[AudioPoint::PEAK]) {
142 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
143 wxGraphicsPath p = gc->CreatePath ();
144 if (_channel_visible[c] && c < _analysis->channels()) {
147 wxColour const col = _colours[c];
148 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
149 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
151 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxSOLID));
157 if (_type_visible[AudioPoint::RMS]) {
158 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
159 wxGraphicsPath p = gc->CreatePath ();
160 if (_channel_visible[c] && c < _analysis->channels()) {
163 wxColour const col = _colours[c];
164 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
165 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
167 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxSOLID));
173 wxGraphicsPath axes = gc->CreatePath ();
174 axes.MoveToPoint (_db_label_width, 0);
175 axes.AddLineToPoint (_db_label_width, _height - _y_origin);
176 axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
177 gc->SetPen (*wxBLACK_PEN);
178 gc->StrokePath (axes);
184 AudioPlot::y_for_linear (float p) const
186 return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
190 AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
192 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
195 int const N = _analysis->points(channel);
196 for (int i = 0; i < N; ++i) {
197 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
198 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
201 } else if (peak < 0) {
205 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
210 AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
212 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
214 list<float> smoothing;
216 int const N = _analysis->points(channel);
218 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
219 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
221 int const before = _smoothing / 2;
222 int const after = _smoothing - before;
224 /* Pre-load the smoothing list */
225 for (int i = 0; i < before; ++i) {
226 smoothing.push_back (first);
228 for (int i = 0; i < after; ++i) {
230 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
232 smoothing.push_back (last);
236 for (int i = 0; i < N; ++i) {
238 int const next_for_window = i + after;
240 if (next_for_window < N) {
241 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
243 smoothing.push_back (last);
246 smoothing.pop_front ();
249 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
253 p = sqrt (p / smoothing.size ());
255 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
260 AudioPlot::set_gain (float g)
267 AudioPlot::set_smoothing (int s)