gtk2_ardour/plugin_eq_gui.cc

   1 /*
   2     Copyright (C) 2008 Paul Davis
   3     Author: Sampo Savolainen
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #include "plugin_eq_gui.h"
  22 #include "fft.h"
  23
  24 #include "ardour_ui.h"
  25 #include "gui_thread.h"
  26 #include <ardour/audio_buffer.h>
  27 #include <ardour/data_type.h>
  28
  29 #include <gtkmm/box.h>
  30 #include <gtkmm/button.h>
  31 #include <gtkmm/checkbutton.h>
  32
  33 #include <iostream>
  34
  35
  36 PluginEqGui::PluginEqGui(boost::shared_ptr<ARDOUR::PluginInsert> pluginInsert)
  37         : _min_dB(-12.0),
  38           _max_dB(+12.0),
  39           _step_dB(3.0),
  40           _impulse_fft(0),
  41           _signal_input_fft(0),
  42           _signal_output_fft(0),
  43           _plugin_insert(pluginInsert)
  44 {
  45         _signal_analysis_running = false;
  46         _samplerate = ARDOUR_UI::instance()->the_session()->frame_rate();
  47
  48         _plugin = _plugin_insert->get_impulse_analysis_plugin();
  49         _plugin->activate();
  50
  51         set_buffer_size(4096, 16384);
  52         //set_buffer_size(4096, 4096);
  53
  54         _log_coeff = (1.0 - 2.0 * (1000.0/(_samplerate/2.0))) / powf(1000.0/(_samplerate/2.0), 2.0);
  55         _log_max = log10f(1 + _log_coeff);
  56
  57
  58         // Setup analysis drawing area
  59         _analysis_scale_surface = 0;
  60
  61         _analysis_area = new Gtk::DrawingArea();
  62         _analysis_width = 500.0;
  63         _analysis_height = 500.0;
  64         _analysis_area->set_size_request(_analysis_width, _analysis_height);
  65
  66         _analysis_area->signal_expose_event().connect( sigc::mem_fun (*this, &PluginEqGui::expose_analysis_area));
  67         _analysis_area->signal_size_allocate().connect( sigc::mem_fun (*this, &PluginEqGui::resize_analysis_area));
  68
  69
  70         // dB selection
  71         dBScaleModel = Gtk::ListStore::create(dBColumns);
  72
  73         dBScaleCombo = new Gtk::ComboBox(dBScaleModel);
  74         dBScaleCombo -> set_title("dB scale");
  75
  76 #define ADD_DB_ROW(MIN,MAX,STEP,NAME) \
  77         { \
  78                 Gtk::TreeModel::Row row = *(dBScaleModel->append()); \
  79                 row[dBColumns.dBMin]  = (MIN); \
  80                 row[dBColumns.dBMax]  = (MAX); \
  81                 row[dBColumns.dBStep] = (STEP); \
  82                 row[dBColumns.name]   = NAME; \
  83         }
  84
  85         ADD_DB_ROW( -6,  +6, 1, "-6dB .. +6dB");
  86         ADD_DB_ROW(-12, +12, 3, "-12dB .. +12dB");
  87         ADD_DB_ROW(-24, +24, 5, "-24dB .. +24dB");
  88         ADD_DB_ROW(-36, +36, 6, "-36dB .. +36dB");
  89         ADD_DB_ROW(-64, +64,12, "-64dB .. +64dB");
  90
  91 #undef ADD_DB_ROW
  92
  93         dBScaleCombo -> pack_start(dBColumns.name);
  94         dBScaleCombo -> set_active(1);
  95
  96         dBScaleCombo -> signal_changed().connect( sigc::mem_fun(*this, &PluginEqGui::change_dB_scale) );
  97
  98         Gtk::Label *dBComboLabel = new Gtk::Label("dB scale");
  99
 100         Gtk::HBox *dBSelectBin = new Gtk::HBox(false, 5);
 101         dBSelectBin->add( *manage(dBComboLabel));
 102         dBSelectBin->add( *manage(dBScaleCombo));
 103
 104         // Phase checkbutton
 105         _phase_button = new Gtk::CheckButton("Show phase");
 106         _phase_button->set_active(true);
 107         _phase_button->signal_toggled().connect( sigc::mem_fun(*this, &PluginEqGui::redraw_scales));
 108
 109         // populate table
 110         attach( *manage(_analysis_area), 1, 3, 1, 2);
 111         attach( *manage(dBSelectBin),    1, 2, 2, 3, Gtk::SHRINK, Gtk::SHRINK);
 112         attach( *manage(_phase_button),  2, 3, 2, 3, Gtk::SHRINK, Gtk::SHRINK);
 113
 114
 115         // Connect the realtime signal collection callback
 116         _plugin_insert->AnalysisDataGathered.connect( sigc::mem_fun(*this, &PluginEqGui::signal_collect_callback ));
 117 }
 118
 119 PluginEqGui::~PluginEqGui()
 120 {
 121         if (_analysis_scale_surface) {
 122                 cairo_surface_destroy (_analysis_scale_surface);
 123         }
 124
 125         delete _impulse_fft;
 126         delete _signal_input_fft;
 127         delete _signal_output_fft;
 128
 129         _plugin->deactivate();
 130
 131         // all gui objects are *manage'd by the inherited Table object
 132 }
 133
 134
 135 void
 136 PluginEqGui::on_hide()
 137 {
 138         stop_updating();
 139         Gtk::Table::on_hide();
 140 }
 141
 142 void
 143 PluginEqGui::stop_updating()
 144 {
 145         if (_update_connection.connected()) {
 146                 _update_connection.disconnect();
 147         }
 148 }
 149
 150 void
 151 PluginEqGui::start_updating()
 152 {
 153         if (!_update_connection.connected() && is_visible()) {
 154                 _update_connection = Glib::signal_timeout().connect( sigc::mem_fun(this, &PluginEqGui::timeout_callback), 250);
 155         }
 156 }
 157
 158 void
 159 PluginEqGui::on_show()
 160 {
 161         Gtk::Table::on_show();
 162
 163         start_updating();
 164
 165         Gtk::Widget *toplevel = get_toplevel();
 166         if (!toplevel) {
 167                 std::cerr << "No toplevel widget for PluginEqGui?!?!" << std::endl;
 168         }
 169
 170         if (!_window_unmap_connection.connected()) {
 171                 _window_unmap_connection = toplevel->signal_unmap().connect( sigc::mem_fun(this, &PluginEqGui::stop_updating));
 172         }
 173
 174         if (!_window_map_connection.connected()) {
 175                 _window_map_connection = toplevel->signal_map().connect( sigc::mem_fun(this, &PluginEqGui::start_updating));
 176         }
 177
 178 }
 179
 180 void
 181 PluginEqGui::change_dB_scale()
 182 {
 183         Gtk::TreeModel::iterator iter = dBScaleCombo -> get_active();
 184
 185         Gtk::TreeModel::Row row;
 186
 187         if(iter && (row = *iter)) {
 188                 _min_dB = row[dBColumns.dBMin];
 189                 _max_dB = row[dBColumns.dBMax];
 190                 _step_dB = row[dBColumns.dBStep];
 191
 192
 193                 redraw_scales();
 194         }
 195 }
 196
 197 void
 198 PluginEqGui::redraw_scales()
 199 {
 200
 201         if (_analysis_scale_surface) {
 202                 cairo_surface_destroy (_analysis_scale_surface);
 203                 _analysis_scale_surface = 0;
 204         }
 205
 206         _analysis_area->queue_draw();
 207
 208         // TODO: Add graph legend!
 209 }
 210
 211 void
 212 PluginEqGui::set_buffer_size(uint32_t size, uint32_t signal_size)
 213 {
 214         if (_buffer_size == size && _signal_buffer_size == signal_size)
 215                 return;
 216
 217
 218         FFT *tmp1 = _impulse_fft;
 219         FFT *tmp2 = _signal_input_fft;
 220         FFT *tmp3 = _signal_output_fft;
 221
 222         try {
 223                 _impulse_fft       = new FFT(size);
 224                 _signal_input_fft  = new FFT(signal_size);
 225                 _signal_output_fft = new FFT(signal_size);
 226         } catch( ... ) {
 227                 // Don't care about lost memory, we're screwed anyhow
 228                 _impulse_fft       = tmp1;
 229                 _signal_input_fft  = tmp2;
 230                 _signal_output_fft = tmp3;
 231                 throw;
 232         }
 233
 234         if (tmp1) delete tmp1;
 235         if (tmp2) delete tmp1;
 236         if (tmp3) delete tmp1;
 237
 238         _buffer_size = size;
 239         _signal_buffer_size = signal_size;
 240
 241         // These are for impulse analysis only, the signal analysis uses the actual
 242         // number of I/O's for the plugininsert
 243         uint32_t inputs  = _plugin->get_info()->n_inputs.n_audio();
 244         uint32_t outputs = _plugin->get_info()->n_outputs.n_audio();
 245
 246         // buffers for the signal analysis are ensured inside PluginInsert
 247         uint32_t n_chans = std::max(inputs, outputs);
 248         _bufferset.ensure_buffers(ARDOUR::DataType::AUDIO, n_chans, _buffer_size);
 249
 250         ARDOUR::ChanCount chanCount(ARDOUR::DataType::AUDIO, n_chans);
 251         _bufferset.set_count(chanCount);
 252 }
 253
 254 void
 255 PluginEqGui::resize_analysis_area(Gtk::Allocation& size)
 256 {
 257         _analysis_width  = (float)size.get_width();
 258         _analysis_height = (float)size.get_height();
 259
 260         if (_analysis_scale_surface) {
 261                 cairo_surface_destroy (_analysis_scale_surface);
 262                 _analysis_scale_surface = 0;
 263         }
 264 }
 265
 266 bool
 267 PluginEqGui::timeout_callback()
 268 {
 269         if (!_signal_analysis_running) {
 270                 _signal_analysis_running = true;
 271                 _plugin_insert -> collect_signal_for_analysis(_signal_buffer_size);
 272         }
 273         run_impulse_analysis();
 274
 275         return true;
 276 }
 277
 278 void
 279 PluginEqGui::signal_collect_callback(ARDOUR::BufferSet *in, ARDOUR::BufferSet *out)
 280 {
 281         ENSURE_GUI_THREAD(bind (mem_fun (*this, &PluginEqGui::signal_collect_callback), in, out));
 282
 283         _signal_input_fft ->reset();
 284         _signal_output_fft->reset();
 285
 286         for (uint32_t i = 0; i < _plugin_insert->input_streams().n_audio(); ++i) {
 287                 _signal_input_fft ->analyze(in ->get_audio(i).data(_signal_buffer_size, 0), FFT::HANN);
 288         }
 289
 290         for (uint32_t i = 0; i < _plugin_insert->output_streams().n_audio(); ++i) {
 291                 _signal_output_fft->analyze(out->get_audio(i).data(_signal_buffer_size, 0), FFT::HANN);
 292         }
 293
 294         _signal_input_fft ->calculate();
 295         _signal_output_fft->calculate();
 296
 297         _signal_analysis_running = false;
 298
 299         // This signals calls expose_analysis_area()
 300         _analysis_area->queue_draw();
 301 }
 302
 303 void
 304 PluginEqGui::run_impulse_analysis()
 305 {
 306         uint32_t inputs  = _plugin->get_info()->n_inputs.n_audio();
 307         uint32_t outputs = _plugin->get_info()->n_outputs.n_audio();
 308
 309         // Create the impulse, can't use silence() because consecutive calls won't work
 310         for (uint32_t i = 0; i < inputs; ++i) {
 311                 ARDOUR::AudioBuffer &buf = _bufferset.get_audio(i);
 312                 ARDOUR::Sample *d = buf.data(_buffer_size, 0);
 313                 memset(d, 0, sizeof(ARDOUR::Sample)*_buffer_size);
 314                 *d = 1.0;
 315         }
 316         uint32_t x,y;
 317         x=y=0;
 318
 319         _plugin->connect_and_run(_bufferset, x, y, _buffer_size, (nframes_t)0);
 320
 321         // Analyze all output buffers
 322         _impulse_fft->reset();
 323         for (uint32_t i = 0; i < outputs; ++i) {
 324                 _impulse_fft->analyze(_bufferset.get_audio(i).data(_buffer_size, 0));
 325         }
 326
 327         // normalize the output
 328         _impulse_fft->calculate();
 329
 330         // This signals calls expose_analysis_area()
 331         _analysis_area->queue_draw();
 332
 333 }
 334
 335 bool
 336 PluginEqGui::expose_analysis_area(GdkEventExpose *evt)
 337 {
 338         redraw_analysis_area();
 339
 340         return false;
 341 }
 342
 343 void
 344 PluginEqGui::draw_analysis_scales(cairo_t *ref_cr)
 345 {
 346         // TODO: check whether we need rounding
 347         _analysis_scale_surface = cairo_surface_create_similar(cairo_get_target(ref_cr),
 348                                                              CAIRO_CONTENT_COLOR,
 349                                                              _analysis_width,
 350                                                              _analysis_height);
 351
 352         cairo_t *cr = cairo_create (_analysis_scale_surface);
 353
 354         cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
 355         cairo_rectangle(cr, 0.0, 0.0, _analysis_width, _analysis_height);
 356         cairo_fill(cr);
 357
 358
 359         draw_scales_power(_analysis_area, cr);
 360         if (_phase_button->get_active()) {
 361                 draw_scales_phase(_analysis_area, cr);
 362         }
 363
 364         cairo_destroy(cr);
 365
 366 }
 367
 368 void
 369 PluginEqGui::redraw_analysis_area()
 370 {
 371         cairo_t *cr;
 372
 373         cr = gdk_cairo_create(GDK_DRAWABLE(_analysis_area->get_window()->gobj()));
 374
 375         if (_analysis_scale_surface == 0) {
 376                 draw_analysis_scales(cr);
 377         }
 378
 379
 380         cairo_copy_page(cr);
 381
 382         cairo_set_source_surface(cr, _analysis_scale_surface, 0.0, 0.0);
 383         cairo_paint(cr);
 384
 385         if (_phase_button->get_active()) {
 386                 plot_impulse_phase(_analysis_area, cr);
 387         }
 388         plot_impulse_amplitude(_analysis_area, cr);
 389
 390         // TODO: make this optional
 391         plot_signal_amplitude_difference(_analysis_area, cr);
 392
 393         cairo_destroy(cr);
 394
 395
 396 }
 397
 398 #define PHASE_PROPORTION 0.5
 399
 400 void
 401 PluginEqGui::draw_scales_phase(Gtk::Widget *w, cairo_t *cr)
 402 {
 403         float y;
 404         cairo_font_extents_t extents;
 405         cairo_font_extents(cr, &extents);
 406
 407         char buf[256];
 408         cairo_text_extents_t t_ext;
 409
 410         for (uint32_t i = 0; i < 3; i++) {
 411
 412                 y = _analysis_height/2.0 - (float)i*(_analysis_height/8.0)*PHASE_PROPORTION;
 413
 414                 cairo_set_source_rgb(cr, .8, .9, 0.2);
 415                 if (i == 0) {
 416                         snprintf(buf,256, "0\u00b0");
 417                 } else {
 418                         snprintf(buf,256, "%d\u00b0", (i * 45));
 419                 }
 420                 cairo_text_extents(cr, buf, &t_ext);
 421                 cairo_move_to(cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
 422                 cairo_show_text(cr, buf);
 423
 424                 if (i == 0)
 425                         continue;
 426
 427
 428                 cairo_set_source_rgba(cr, .8, .9, 0.2, 0.6/(float)i);
 429                 cairo_move_to(cr, 0.0,            y);
 430                 cairo_line_to(cr, _analysis_width, y);
 431
 432
 433                 y = _analysis_height/2.0 + (float)i*(_analysis_height/8.0)*PHASE_PROPORTION;
 434
 435                 // label
 436                 snprintf(buf,256, "-%d\u00b0", (i * 45));
 437                 cairo_set_source_rgb(cr, .8, .9, 0.2);
 438                 cairo_text_extents(cr, buf, &t_ext);
 439                 cairo_move_to(cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
 440                 cairo_show_text(cr, buf);
 441
 442                 // line
 443                 cairo_set_source_rgba(cr, .8, .9, 0.2, 0.6/(float)i);
 444                 cairo_move_to(cr, 0.0,            y);
 445                 cairo_line_to(cr, _analysis_width, y);
 446
 447                 cairo_set_line_width (cr, 0.25 + 1.0/(float)(i+1));
 448                 cairo_stroke(cr);
 449         }
 450 }
 451
 452 void
 453 PluginEqGui::plot_impulse_phase(Gtk::Widget *w, cairo_t *cr)
 454 {
 455         float x,y;
 456
 457         int prevX = 0;
 458         float avgY = 0.0;
 459         int avgNum = 0;
 460
 461         // float width  = w->get_width();
 462         float height = w->get_height();
 463
 464         cairo_set_source_rgba(cr, 0.95, 0.3, 0.2, 1.0);
 465         for (uint32_t i = 0; i < _impulse_fft->bins()-1; i++) {
 466                 // x coordinate of bin i
 467                 x  = log10f(1.0 + (float)i / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 468                 x *= _analysis_width;
 469
 470                 y  = _analysis_height/2.0 - (_impulse_fft->phase_at_bin(i)/M_PI)*(_analysis_height/2.0)*PHASE_PROPORTION;
 471
 472                 if ( i == 0 ) {
 473                         cairo_move_to(cr, x, y);
 474
 475                         avgY = 0;
 476                         avgNum = 0;
 477                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 478                         avgY = avgY/(float)avgNum;
 479                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 480                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 481                         cairo_line_to(cr, prevX, avgY);
 482                         //cairo_line_to(cr, prevX, avgY/(float)avgNum);
 483
 484                         avgY = 0;
 485                         avgNum = 0;
 486
 487                 }
 488
 489                 prevX = rint(x);
 490                 avgY += y;
 491                 avgNum++;
 492         }
 493
 494         cairo_set_line_width (cr, 2.0);
 495         cairo_stroke(cr);
 496 }
 497
 498 void
 499 PluginEqGui::draw_scales_power(Gtk::Widget *w, cairo_t *cr)
 500 {
 501         static float scales[] = { 30.0, 70.0, 125.0, 250.0, 500.0, 1000.0, 2000.0, 5000.0, 10000.0, 15000.0, 20000.0, -1.0 };
 502
 503         float divisor = _samplerate / 2.0 / _impulse_fft->bins();
 504         float x;
 505
 506         cairo_set_line_width (cr, 1.5);
 507         cairo_set_font_size(cr, 9);
 508
 509         cairo_font_extents_t extents;
 510         cairo_font_extents(cr, &extents);
 511         // float fontXOffset = extents.descent + 1.0;
 512
 513         char buf[256];
 514
 515         for (uint32_t i = 0; scales[i] != -1.0; ++i) {
 516                 float bin = scales[i] / divisor;
 517
 518                 x  = log10f(1.0 + bin / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 519                 x *= _analysis_width;
 520
 521                 if (scales[i] < 1000.0) {
 522                         snprintf(buf, 256, "%0.0f", scales[i]);
 523                 } else {
 524                         snprintf(buf, 256, "%0.0fk", scales[i]/1000.0);
 525                 }
 526
 527                 cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 528
 529                 //cairo_move_to(cr, x + fontXOffset, 3.0);
 530                 cairo_move_to(cr, x - extents.height, 3.0);
 531
 532                 cairo_rotate(cr, M_PI / 2.0);
 533                 cairo_show_text(cr, buf);
 534                 cairo_rotate(cr, -M_PI / 2.0);
 535                 cairo_stroke(cr);
 536
 537                 cairo_set_source_rgb(cr, 0.3, 0.3, 0.3);
 538                 cairo_move_to(cr, x, _analysis_height);
 539                 cairo_line_to(cr, x, 0.0);
 540                 cairo_stroke(cr);
 541         }
 542
 543         float y;
 544
 545         //double dashes[] = { 1.0, 3.0, 4.5, 3.0 };
 546         double dashes[] = { 3.0, 5.0 };
 547
 548         for (float dB = 0.0; dB < _max_dB; dB += _step_dB ) {
 549                 snprintf(buf, 256, "+%0.0f", dB );
 550
 551                 y  = ( _max_dB - dB) / ( _max_dB - _min_dB );
 552                 //std::cerr << " y = " << y << std::endl;
 553                 y *= _analysis_height;
 554
 555                 if (dB != 0.0) {
 556                         cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 557                         cairo_move_to(cr, 1.0,     y + extents.height + 1.0);
 558                         cairo_show_text(cr, buf);
 559                         cairo_stroke(cr);
 560                 }
 561
 562                 cairo_set_source_rgb(cr, 0.2, 0.2, 0.2);
 563                 cairo_move_to(cr, 0,     y);
 564                 cairo_line_to(cr, _analysis_width, y);
 565                 cairo_stroke(cr);
 566
 567                 if (dB == 0.0) {
 568                         cairo_set_dash(cr, dashes, 2, 0.0);
 569                 }
 570         }
 571
 572
 573
 574         for (float dB = - _step_dB; dB > _min_dB; dB -= _step_dB ) {
 575                 snprintf(buf, 256, "%0.0f", dB );
 576
 577                 y  = ( _max_dB - dB) / ( _max_dB - _min_dB );
 578                 y *= _analysis_height;
 579
 580                 cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 581                 cairo_move_to(cr, 1.0,     y - extents.descent - 1.0);
 582                 cairo_show_text(cr, buf);
 583                 cairo_stroke(cr);
 584
 585                 cairo_set_source_rgb(cr, 0.2, 0.2, 0.2);
 586                 cairo_move_to(cr, 0,     y);
 587                 cairo_line_to(cr, _analysis_width, y);
 588                 cairo_stroke(cr);
 589         }
 590
 591         cairo_set_dash(cr, 0, 0, 0.0);
 592
 593 }
 594
 595 inline float
 596 power_to_dB(float a)
 597 {
 598         return 10.0 * log10f(a);
 599 }
 600
 601 void
 602 PluginEqGui::plot_impulse_amplitude(Gtk::Widget *w, cairo_t *cr)
 603 {
 604         float x,y;
 605
 606         int prevX = 0;
 607         float avgY = 0.0;
 608         int avgNum = 0;
 609
 610         // float width  = w->get_width();
 611         float height = w->get_height();
 612
 613         cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
 614         cairo_set_line_width (cr, 2.5);
 615
 616         for (uint32_t i = 0; i < _impulse_fft->bins()-1; i++) {
 617                 // x coordinate of bin i
 618                 x  = log10f(1.0 + (float)i / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 619                 x *= _analysis_width;
 620
 621                 float yCoeff = ( power_to_dB(_impulse_fft->power_at_bin(i)) - _min_dB) / (_max_dB - _min_dB);
 622
 623                 y = _analysis_height - _analysis_height*yCoeff;
 624
 625                 if ( i == 0 ) {
 626                         cairo_move_to(cr, x, y);
 627
 628                         avgY = 0;
 629                         avgNum = 0;
 630                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 631                         avgY = avgY/(float)avgNum;
 632                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 633                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 634                         cairo_line_to(cr, prevX, avgY);
 635                         //cairo_line_to(cr, prevX, avgY/(float)avgNum);
 636
 637                         avgY = 0;
 638                         avgNum = 0;
 639
 640                 }
 641
 642                 prevX = rint(x);
 643                 avgY += y;
 644                 avgNum++;
 645         }
 646
 647         cairo_stroke(cr);
 648 }
 649
 650 void
 651 PluginEqGui::plot_signal_amplitude_difference(Gtk::Widget *w, cairo_t *cr)
 652 {
 653         float x,y;
 654
 655         int prevX = 0;
 656         float avgY = 0.0;
 657         int avgNum = 0;
 658
 659         // float width  = w->get_width();
 660         float height = w->get_height();
 661
 662         cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
 663         cairo_set_line_width (cr, 2.5);
 664
 665         for (uint32_t i = 0; i < _signal_input_fft->bins()-1; i++) {
 666                 // x coordinate of bin i
 667                 x  = log10f(1.0 + (float)i / (float)_signal_input_fft->bins() * _log_coeff) / _log_max;
 668                 x *= _analysis_width;
 669
 670                 float power_out = power_to_dB(_signal_output_fft->power_at_bin(i));
 671                 float power_in  = power_to_dB(_signal_input_fft ->power_at_bin(i));
 672                 float power = power_out - power_in;
 673
 674                 // for SaBer
 675                 /*
 676                 double p = 10.0 * log10( 1.0 + (double)_signal_output_fft->power_at_bin(i) - (double)
 677  - _signal_input_fft ->power_at_bin(i));
 678                 //p *= 1000000.0;
 679                 float power = (float)p;
 680
 681                 if ( (i % 1000) == 0) {
 682                         std::cerr << i << ": " << power << std::endl;
 683                 }
 684                 */
 685
 686                 if (isinf(power)) {
 687                         if (power < 0) {
 688                                 power = _min_dB - 1.0;
 689                         } else {
 690                                 power = _max_dB - 1.0;
 691                         }
 692                 } else if (isnan(power)) {
 693                         power = _min_dB - 1.0;
 694                 }
 695
 696                 float yCoeff = ( power - _min_dB) / (_max_dB - _min_dB);
 697
 698                 y = _analysis_height - _analysis_height*yCoeff;
 699
 700                 if ( i == 0 ) {
 701                         cairo_move_to(cr, x, y);
 702
 703                         avgY = 0;
 704                         avgNum = 0;
 705                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 706                         avgY = avgY/(float)avgNum;
 707                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 708                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 709                         cairo_line_to(cr, prevX, avgY);
 710
 711                         avgY = 0;
 712                         avgNum = 0;
 713
 714                 }
 715
 716                 prevX = rint(x);
 717                 avgY += y;
 718                 avgNum++;
 719         }
 720
 721         cairo_stroke(cr);
 722
 723
 724 }