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)
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 (100, 100, 100));
64 Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (AudioPlot::paint), 0, this);
66 SetMinSize (wxSize (640, 512));
70 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
74 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
75 _channel_visible[i] = false;
78 for (int i = 0; i < AudioPoint::COUNT; ++i) {
79 _type_visible[i] = false;
86 AudioPlot::set_channel_visible (int c, bool v)
88 _channel_visible[c] = v;
93 AudioPlot::set_type_visible (int t, bool v)
100 AudioPlot::paint (wxPaintEvent &)
104 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
109 if (!_analysis || _analysis->channels() == 0) {
110 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
111 gc->DrawText (_("Please wait; audio is being analysed..."), 32, 32);
115 wxGraphicsPath grid = gc->CreatePath ();
116 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
117 wxDouble db_label_height;
118 wxDouble db_label_descent;
119 wxDouble db_label_leading;
120 gc->GetTextExtent (wxT ("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
122 _db_label_width += 8;
124 int const data_width = GetSize().GetWidth() - _db_label_width;
125 /* Assume all channels have the same number of points */
126 _x_scale = data_width / float (_analysis->points (0));
127 _height = GetSize().GetHeight ();
129 _y_scale = (_height - _y_origin) / -_minimum;
131 for (int i = _minimum; i <= 0; i += 10) {
132 int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
133 grid.MoveToPoint (_db_label_width - 4, y);
134 grid.AddLineToPoint (_db_label_width + data_width, y);
135 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
138 gc->SetPen (*wxLIGHT_GREY_PEN);
139 gc->StrokePath (grid);
141 gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
144 if (_type_visible[AudioPoint::PEAK]) {
145 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
146 wxGraphicsPath p = gc->CreatePath ();
147 if (_channel_visible[c] && c < _analysis->channels()) {
150 wxColour const col = _colours[c];
151 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
152 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
154 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxSOLID));
160 if (_type_visible[AudioPoint::RMS]) {
161 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
162 wxGraphicsPath p = gc->CreatePath ();
163 if (_channel_visible[c] && c < _analysis->channels()) {
166 wxColour const col = _colours[c];
167 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
168 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
170 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxSOLID));
176 wxGraphicsPath axes = gc->CreatePath ();
177 axes.MoveToPoint (_db_label_width, 0);
178 axes.AddLineToPoint (_db_label_width, _height - _y_origin);
179 axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
180 gc->SetPen (*wxBLACK_PEN);
181 gc->StrokePath (axes);
187 AudioPlot::y_for_linear (float p) const
189 return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
193 AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
195 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
198 int const N = _analysis->points(channel);
199 for (int i = 0; i < N; ++i) {
200 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
201 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
204 } else if (peak < 0) {
208 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
213 AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
215 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
217 list<float> smoothing;
219 int const N = _analysis->points(channel);
221 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
222 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
224 int const before = _smoothing / 2;
225 int const after = _smoothing - before;
227 /* Pre-load the smoothing list */
228 for (int i = 0; i < before; ++i) {
229 smoothing.push_back (first);
231 for (int i = 0; i < after; ++i) {
233 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
235 smoothing.push_back (last);
239 for (int i = 0; i < N; ++i) {
241 int const next_for_window = i + after;
243 if (next_for_window < N) {
244 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
246 smoothing.push_back (last);
249 smoothing.pop_front ();
252 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
256 p = sqrt (p / smoothing.size ());
258 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
263 AudioPlot::set_gain (float g)
270 AudioPlot::set_smoothing (int s)