1 /* -*- c-basic-offset: 8; default-tab-width: 8; -*- */
4 Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <boost/bind.hpp>
24 #include <wx/graphics.h>
25 #include "audio_plot.h"
26 #include "lib/audio_decoder.h"
27 #include "lib/audio_analysis.h"
28 #include "wx/wx_util.h"
36 using boost::shared_ptr;
38 int const AudioPlot::_minimum = -70;
39 int const AudioPlot::max_smoothing = 128;
41 AudioPlot::AudioPlot (wxWindow* parent)
42 : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
44 , _smoothing (max_smoothing / 2)
46 SetDoubleBuffered (true);
48 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
49 _channel_visible[i] = false;
52 for (int i = 0; i < AudioPoint::COUNT; ++i) {
53 _type_visible[i] = false;
56 _colours.push_back (wxColour ( 0, 0, 0));
57 _colours.push_back (wxColour (255, 0, 0));
58 _colours.push_back (wxColour ( 0, 255, 0));
59 _colours.push_back (wxColour (139, 0, 204));
60 _colours.push_back (wxColour ( 0, 0, 255));
61 _colours.push_back (wxColour (100, 100, 100));
63 Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (AudioPlot::paint), 0, this);
65 SetMinSize (wxSize (640, 512));
69 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
73 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
74 _channel_visible[i] = false;
77 for (int i = 0; i < AudioPoint::COUNT; ++i) {
78 _type_visible[i] = false;
85 AudioPlot::set_channel_visible (int c, bool v)
87 _channel_visible[c] = v;
92 AudioPlot::set_type_visible (int t, bool v)
99 AudioPlot::paint (wxPaintEvent &)
103 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
108 if (!_analysis || _analysis->channels() == 0) {
109 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
110 gc->DrawText (_("Please wait; audio is being analysed..."), 32, 32);
114 wxGraphicsPath grid = gc->CreatePath ();
115 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
116 wxDouble db_label_height;
117 wxDouble db_label_descent;
118 wxDouble db_label_leading;
119 gc->GetTextExtent (wxT ("-80dB"), &_db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
121 _db_label_width += 8;
123 int const data_width = GetSize().GetWidth() - _db_label_width;
124 /* Assume all channels have the same number of points */
125 _x_scale = data_width / float (_analysis->points (0));
126 _height = GetSize().GetHeight ();
128 _y_scale = (_height - _y_origin) / -_minimum;
130 for (int i = _minimum; i <= 0; i += 10) {
131 int const y = (_height - (i - _minimum) * _y_scale) - _y_origin;
132 grid.MoveToPoint (_db_label_width - 4, y);
133 grid.AddLineToPoint (_db_label_width + data_width, y);
134 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
137 gc->SetPen (*wxLIGHT_GREY_PEN);
138 gc->StrokePath (grid);
140 gc->DrawText (_("Time"), data_width, _height - _y_origin + db_label_height / 2);
143 if (_type_visible[AudioPoint::PEAK]) {
144 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
145 wxGraphicsPath p = gc->CreatePath ();
146 if (_channel_visible[c] && c < _analysis->channels()) {
149 wxColour const col = _colours[c];
150 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
151 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
153 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxSOLID));
159 if (_type_visible[AudioPoint::RMS]) {
160 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
161 wxGraphicsPath p = gc->CreatePath ();
162 if (_channel_visible[c] && c < _analysis->channels()) {
165 wxColour const col = _colours[c];
166 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
167 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
169 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxSOLID));
175 wxGraphicsPath axes = gc->CreatePath ();
176 axes.MoveToPoint (_db_label_width, 0);
177 axes.AddLineToPoint (_db_label_width, _height - _y_origin);
178 axes.AddLineToPoint (_db_label_width + data_width, _height - _y_origin);
179 gc->SetPen (*wxBLACK_PEN);
180 gc->StrokePath (axes);
186 AudioPlot::y_for_linear (float p) const
188 return _height - (20 * log10(p) - _minimum + _gain) * _y_scale - _y_origin;
192 AudioPlot::plot_peak (wxGraphicsPath& path, int channel) const
194 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK]));
197 int const N = _analysis->points(channel);
198 for (int i = 0; i < N; ++i) {
199 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
200 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
203 } else if (peak < 0) {
207 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (peak));
212 AudioPlot::plot_rms (wxGraphicsPath& path, int channel) const
214 path.MoveToPoint (_db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS]));
216 list<float> smoothing;
218 int const N = _analysis->points(channel);
220 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
221 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
223 int const before = _smoothing / 2;
224 int const after = _smoothing - before;
226 /* Pre-load the smoothing list */
227 for (int i = 0; i < before; ++i) {
228 smoothing.push_back (first);
230 for (int i = 0; i < after; ++i) {
232 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
234 smoothing.push_back (last);
238 for (int i = 0; i < N; ++i) {
240 int const next_for_window = i + after;
242 if (next_for_window < N) {
243 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
245 smoothing.push_back (last);
248 smoothing.pop_front ();
251 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
255 p = sqrt (p / smoothing.size ());
257 path.AddLineToPoint (_db_label_width + i * _x_scale, y_for_linear (p));
262 AudioPlot::set_gain (float g)
269 AudioPlot::set_smoothing (int s)