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 #include "ardour/chan_mapping.h"
  29 #include "ardour/session.h"
  30
  31 #include <gtkmm/box.h>
  32 #include <gtkmm/button.h>
  33 #include <gtkmm/checkbutton.h>
  34
  35 #include <iostream>
  36 #include <cmath>
  37
  38 PluginEqGui::PluginEqGui(boost::shared_ptr<ARDOUR::PluginInsert> pluginInsert)
  39         : _min_dB(-12.0),
  40           _max_dB(+12.0),
  41           _step_dB(3.0),
  42           _impulse_fft(0),
  43           _signal_input_fft(0),
  44           _signal_output_fft(0),
  45           _plugin_insert(pluginInsert)
  46 {
  47         _signal_analysis_running = false;
  48         _samplerate = ARDOUR_UI::instance()->the_session()->frame_rate();
  49
  50         _plugin = _plugin_insert->get_impulse_analysis_plugin();
  51         _plugin->activate();
  52
  53         set_buffer_size(4096, 16384);
  54         //set_buffer_size(4096, 4096);
  55
  56         _log_coeff = (1.0 - 2.0 * (1000.0/(_samplerate/2.0))) / powf(1000.0/(_samplerate/2.0), 2.0);
  57         _log_max = log10f(1 + _log_coeff);
  58
  59
  60         // Setup analysis drawing area
  61         _analysis_scale_surface = 0;
  62
  63         _analysis_area = new Gtk::DrawingArea();
  64         _analysis_width = 500.0;
  65         _analysis_height = 500.0;
  66         _analysis_area->set_size_request(_analysis_width, _analysis_height);
  67
  68         _analysis_area->signal_expose_event().connect( sigc::mem_fun (*this, &PluginEqGui::expose_analysis_area));
  69         _analysis_area->signal_size_allocate().connect( sigc::mem_fun (*this, &PluginEqGui::resize_analysis_area));
  70
  71
  72         // dB selection
  73         dBScaleModel = Gtk::ListStore::create(dBColumns);
  74
  75         dBScaleCombo = new Gtk::ComboBox(dBScaleModel);
  76         dBScaleCombo -> set_title("dB scale");
  77
  78 #define ADD_DB_ROW(MIN,MAX,STEP,NAME) \
  79         { \
  80                 Gtk::TreeModel::Row row = *(dBScaleModel->append()); \
  81                 row[dBColumns.dBMin]  = (MIN); \
  82                 row[dBColumns.dBMax]  = (MAX); \
  83                 row[dBColumns.dBStep] = (STEP); \
  84                 row[dBColumns.name]   = NAME; \
  85         }
  86
  87         ADD_DB_ROW( -6,  +6, 1, "-6dB .. +6dB");
  88         ADD_DB_ROW(-12, +12, 3, "-12dB .. +12dB");
  89         ADD_DB_ROW(-24, +24, 5, "-24dB .. +24dB");
  90         ADD_DB_ROW(-36, +36, 6, "-36dB .. +36dB");
  91         ADD_DB_ROW(-64, +64,12, "-64dB .. +64dB");
  92
  93 #undef ADD_DB_ROW
  94
  95         dBScaleCombo -> pack_start(dBColumns.name);
  96         dBScaleCombo -> set_active(1);
  97
  98         dBScaleCombo -> signal_changed().connect( sigc::mem_fun(*this, &PluginEqGui::change_dB_scale) );
  99
 100         Gtk::Label *dBComboLabel = new Gtk::Label("dB scale");
 101
 102         Gtk::HBox *dBSelectBin = new Gtk::HBox(false, 5);
 103         dBSelectBin->add( *manage(dBComboLabel));
 104         dBSelectBin->add( *manage(dBScaleCombo));
 105
 106         // Phase checkbutton
 107         _phase_button = new Gtk::CheckButton("Show phase");
 108         _phase_button->set_active(true);
 109         _phase_button->signal_toggled().connect( sigc::mem_fun(*this, &PluginEqGui::redraw_scales));
 110
 111         // populate table
 112         attach( *manage(_analysis_area), 1, 3, 1, 2);
 113         attach( *manage(dBSelectBin),    1, 2, 2, 3, Gtk::SHRINK, Gtk::SHRINK);
 114         attach( *manage(_phase_button),  2, 3, 2, 3, Gtk::SHRINK, Gtk::SHRINK);
 115
 116
 117         // Connect the realtime signal collection callback
 118         _plugin_insert->AnalysisDataGathered.connect (analysis_connection, invalidator (*this), ui_bind (&PluginEqGui::signal_collect_callback, this, _1, _2), gui_context());
 119 }
 120
 121 PluginEqGui::~PluginEqGui()
 122 {
 123         if (_analysis_scale_surface) {
 124                 cairo_surface_destroy (_analysis_scale_surface);
 125         }
 126
 127         delete _impulse_fft;
 128         delete _signal_input_fft;
 129         delete _signal_output_fft;
 130
 131         _plugin->deactivate();
 132
 133         // all gui objects are *manage'd by the inherited Table object
 134 }
 135
 136
 137 void
 138 PluginEqGui::on_hide()
 139 {
 140         stop_updating();
 141         Gtk::Table::on_hide();
 142 }
 143
 144 void
 145 PluginEqGui::stop_updating()
 146 {
 147         if (_update_connection.connected()) {
 148                 _update_connection.disconnect();
 149         }
 150 }
 151
 152 void
 153 PluginEqGui::start_updating()
 154 {
 155         if (!_update_connection.connected() && is_visible()) {
 156                 _update_connection = Glib::signal_timeout().connect( sigc::mem_fun(this, &PluginEqGui::timeout_callback), 250);
 157         }
 158 }
 159
 160 void
 161 PluginEqGui::on_show()
 162 {
 163         Gtk::Table::on_show();
 164
 165         start_updating();
 166
 167         Gtk::Widget *toplevel = get_toplevel();
 168         if (!toplevel) {
 169                 std::cerr << "No toplevel widget for PluginEqGui?!?!" << std::endl;
 170         }
 171
 172         if (!_window_unmap_connection.connected()) {
 173                 _window_unmap_connection = toplevel->signal_unmap().connect( sigc::mem_fun(this, &PluginEqGui::stop_updating));
 174         }
 175
 176         if (!_window_map_connection.connected()) {
 177                 _window_map_connection = toplevel->signal_map().connect( sigc::mem_fun(this, &PluginEqGui::start_updating));
 178         }
 179
 180 }
 181
 182 void
 183 PluginEqGui::change_dB_scale()
 184 {
 185         Gtk::TreeModel::iterator iter = dBScaleCombo -> get_active();
 186
 187         Gtk::TreeModel::Row row;
 188
 189         if(iter && (row = *iter)) {
 190                 _min_dB = row[dBColumns.dBMin];
 191                 _max_dB = row[dBColumns.dBMax];
 192                 _step_dB = row[dBColumns.dBStep];
 193
 194
 195                 redraw_scales();
 196         }
 197 }
 198
 199 void
 200 PluginEqGui::redraw_scales()
 201 {
 202
 203         if (_analysis_scale_surface) {
 204                 cairo_surface_destroy (_analysis_scale_surface);
 205                 _analysis_scale_surface = 0;
 206         }
 207
 208         _analysis_area->queue_draw();
 209
 210         // TODO: Add graph legend!
 211 }
 212
 213 void
 214 PluginEqGui::set_buffer_size(uint32_t size, uint32_t signal_size)
 215 {
 216         if (_buffer_size == size && _signal_buffer_size == signal_size)
 217                 return;
 218
 219
 220         FFT *tmp1 = _impulse_fft;
 221         FFT *tmp2 = _signal_input_fft;
 222         FFT *tmp3 = _signal_output_fft;
 223
 224         try {
 225                 _impulse_fft       = new FFT(size);
 226                 _signal_input_fft  = new FFT(signal_size);
 227                 _signal_output_fft = new FFT(signal_size);
 228         } catch( ... ) {
 229                 // Don't care about lost memory, we're screwed anyhow
 230                 _impulse_fft       = tmp1;
 231                 _signal_input_fft  = tmp2;
 232                 _signal_output_fft = tmp3;
 233                 throw;
 234         }
 235
 236         delete tmp1;
 237         delete tmp2;
 238         delete tmp3;
 239
 240         _buffer_size = size;
 241         _signal_buffer_size = signal_size;
 242
 243         // These are for impulse analysis only, the signal analysis uses the actual
 244         // number of I/O's for the plugininsert
 245         uint32_t inputs  = _plugin->get_info()->n_inputs.n_audio();
 246         uint32_t outputs = _plugin->get_info()->n_outputs.n_audio();
 247
 248         // buffers for the signal analysis are ensured inside PluginInsert
 249         uint32_t n_chans = std::max(inputs, outputs);
 250         _bufferset.ensure_buffers(ARDOUR::DataType::AUDIO, n_chans, _buffer_size);
 251         _collect_bufferset.ensure_buffers(ARDOUR::DataType::AUDIO, n_chans, _buffer_size);
 252
 253         ARDOUR::ChanCount chanCount(ARDOUR::DataType::AUDIO, n_chans);
 254         _bufferset.set_count(chanCount);
 255         _collect_bufferset.set_count(chanCount);
 256 }
 257
 258 void
 259 PluginEqGui::resize_analysis_area(Gtk::Allocation& size)
 260 {
 261         _analysis_width  = (float)size.get_width();
 262         _analysis_height = (float)size.get_height();
 263
 264         if (_analysis_scale_surface) {
 265                 cairo_surface_destroy (_analysis_scale_surface);
 266                 _analysis_scale_surface = 0;
 267         }
 268 }
 269
 270 bool
 271 PluginEqGui::timeout_callback()
 272 {
 273         if (!_signal_analysis_running) {
 274                 _signal_analysis_running = true;
 275                 _plugin_insert -> collect_signal_for_analysis(_signal_buffer_size);
 276         }
 277         run_impulse_analysis();
 278
 279         return true;
 280 }
 281
 282 void
 283 PluginEqGui::signal_collect_callback(ARDOUR::BufferSet *in, ARDOUR::BufferSet *out)
 284 {
 285         ENSURE_GUI_THREAD (*this, &PluginEqGui::signal_collect_callback, in, out)
 286
 287         _signal_input_fft ->reset();
 288         _signal_output_fft->reset();
 289
 290         for (uint32_t i = 0; i < _plugin_insert->input_streams().n_audio(); ++i) {
 291                 _signal_input_fft ->analyze(in ->get_audio(i).data(), FFT::HANN);
 292         }
 293
 294         for (uint32_t i = 0; i < _plugin_insert->output_streams().n_audio(); ++i) {
 295                 _signal_output_fft->analyze(out->get_audio(i).data(), FFT::HANN);
 296         }
 297
 298         _signal_input_fft ->calculate();
 299         _signal_output_fft->calculate();
 300
 301         _signal_analysis_running = false;
 302
 303         // This signals calls expose_analysis_area()
 304         _analysis_area->queue_draw();
 305 }
 306
 307 void
 308 PluginEqGui::run_impulse_analysis()
 309 {
 310         uint32_t inputs  = _plugin->get_info()->n_inputs.n_audio();
 311         uint32_t outputs = _plugin->get_info()->n_outputs.n_audio();
 312
 313         // Create the impulse, can't use silence() because consecutive calls won't work
 314         for (uint32_t i = 0; i < inputs; ++i) {
 315                 ARDOUR::AudioBuffer& buf = _bufferset.get_audio(i);
 316                 ARDOUR::Sample* d = buf.data();
 317                 memset(d, 0, sizeof(ARDOUR::Sample)*_buffer_size);
 318                 *d = 1.0;
 319         }
 320
 321         ARDOUR::ChanMapping in_map(_plugin->get_info()->n_inputs);
 322         ARDOUR::ChanMapping out_map(_plugin->get_info()->n_outputs);
 323
 324         _plugin->connect_and_run(_bufferset, in_map, out_map, _buffer_size, (nframes_t)0);
 325         nframes_t f = _plugin->signal_latency();
 326         // Adding user_latency() could be interesting
 327
 328         // Gather all output, taking latency into account.
 329         _impulse_fft->reset();
 330
 331         // Silence collect buffers to copy data to, can't use silence() because consecutive calls won't work
 332         for (uint32_t i = 0; i < outputs; ++i) {
 333                 ARDOUR::AudioBuffer &buf = _collect_bufferset.get_audio(i);
 334                 ARDOUR::Sample *d = buf.data();
 335                 memset(d, 0, sizeof(ARDOUR::Sample)*_buffer_size);
 336         }
 337
 338         if (f == 0) {
 339                 //std::cerr << "0: no latency, copying full buffer, trivial.." << std::endl;
 340                 for (uint32_t i = 0; i < outputs; ++i) {
 341                         memcpy(_collect_bufferset.get_audio(i).data(),
 342                                _bufferset.get_audio(i).data(), _buffer_size * sizeof(float));
 343                 }
 344         } else {
 345                 //int C = 0;
 346                 //std::cerr << (++C) << ": latency is " << f << " frames, doing split processing.." << std::endl;
 347                 nframes_t target_offset = 0;
 348                 nframes_t frames_left = _buffer_size; // refaktoroi
 349                 do {
 350                         if (f >= _buffer_size) {
 351                                 //std::cerr << (++C) << ": f (=" << f << ") is larger than buffer_size, still trying to reach the actual output" << std::endl;
 352                                 // there is no data in this buffer regarding to the input!
 353                                 f -= _buffer_size;
 354                         } else {
 355                                 // this buffer contains either the first, last or a whole bu the output of the impulse
 356                                 // first part: offset is 0, so we copy to the start of _collect_bufferset
 357                                 //             we start at output offset "f"
 358                                 //             .. and copy "buffer size" - "f" - "offset" frames
 359
 360                                 nframes_t length = _buffer_size - f - target_offset;
 361
 362                                 //std::cerr << (++C) << ": copying " << length << " frames to _collect_bufferset.get_audio(i)+" << target_offset << " from bufferset at offset " << f << std::endl;
 363                                 for (uint32_t i = 0; i < outputs; ++i) {
 364                                         memcpy(_collect_bufferset.get_audio(i).data(target_offset),
 365                                                 _bufferset.get_audio(i).data() + f,
 366                                                 length * sizeof(float));
 367                                 }
 368
 369                                 target_offset += length;
 370                                 frames_left   -= length;
 371                                 f = 0;
 372                         }
 373                         if (frames_left > 0) {
 374                                 // Silence the buffers
 375                                 for (uint32_t i = 0; i < inputs; ++i) {
 376                                         ARDOUR::AudioBuffer &buf = _bufferset.get_audio(i);
 377                                         ARDOUR::Sample *d = buf.data();
 378                                         memset(d, 0, sizeof(ARDOUR::Sample)*_buffer_size);
 379                                 }
 380
 381                                 in_map  = ARDOUR::ChanMapping(_plugin->get_info()->n_inputs);
 382                                 out_map = ARDOUR::ChanMapping(_plugin->get_info()->n_outputs);
 383                                 _plugin->connect_and_run(_bufferset, in_map, out_map, _buffer_size, (nframes_t)0);
 384                         }
 385                 } while ( frames_left > 0);
 386
 387         }
 388
 389
 390         for (uint32_t i = 0; i < outputs; ++i) {
 391                 _impulse_fft->analyze(_collect_bufferset.get_audio(i).data());
 392         }
 393
 394         // normalize the output
 395         _impulse_fft->calculate();
 396
 397         // This signals calls expose_analysis_area()
 398         _analysis_area->queue_draw();
 399 }
 400
 401 bool
 402 PluginEqGui::expose_analysis_area(GdkEventExpose *)
 403 {
 404         redraw_analysis_area();
 405
 406         return false;
 407 }
 408
 409 void
 410 PluginEqGui::draw_analysis_scales(cairo_t *ref_cr)
 411 {
 412         // TODO: check whether we need rounding
 413         _analysis_scale_surface = cairo_surface_create_similar(cairo_get_target(ref_cr),
 414                                                              CAIRO_CONTENT_COLOR,
 415                                                              _analysis_width,
 416                                                              _analysis_height);
 417
 418         cairo_t *cr = cairo_create (_analysis_scale_surface);
 419
 420         cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
 421         cairo_rectangle(cr, 0.0, 0.0, _analysis_width, _analysis_height);
 422         cairo_fill(cr);
 423
 424
 425         draw_scales_power(_analysis_area, cr);
 426         if (_phase_button->get_active()) {
 427                 draw_scales_phase(_analysis_area, cr);
 428         }
 429
 430         cairo_destroy(cr);
 431
 432 }
 433
 434 void
 435 PluginEqGui::redraw_analysis_area()
 436 {
 437         cairo_t *cr;
 438
 439         cr = gdk_cairo_create(GDK_DRAWABLE(_analysis_area->get_window()->gobj()));
 440
 441         if (_analysis_scale_surface == 0) {
 442                 draw_analysis_scales(cr);
 443         }
 444
 445
 446         cairo_copy_page(cr);
 447
 448         cairo_set_source_surface(cr, _analysis_scale_surface, 0.0, 0.0);
 449         cairo_paint(cr);
 450
 451         if (_phase_button->get_active()) {
 452                 plot_impulse_phase(_analysis_area, cr);
 453         }
 454         plot_impulse_amplitude(_analysis_area, cr);
 455
 456         // TODO: make this optional
 457         plot_signal_amplitude_difference(_analysis_area, cr);
 458
 459         cairo_destroy(cr);
 460
 461
 462 }
 463
 464 #define PHASE_PROPORTION 0.5
 465
 466 void
 467 PluginEqGui::draw_scales_phase(Gtk::Widget */*w*/, cairo_t *cr)
 468 {
 469         float y;
 470         cairo_font_extents_t extents;
 471         cairo_font_extents(cr, &extents);
 472
 473         char buf[256];
 474         cairo_text_extents_t t_ext;
 475
 476         for (uint32_t i = 0; i < 3; i++) {
 477
 478                 y = _analysis_height/2.0 - (float)i*(_analysis_height/8.0)*PHASE_PROPORTION;
 479
 480                 cairo_set_source_rgb(cr, .8, .9, 0.2);
 481                 if (i == 0) {
 482                         snprintf(buf,256, "0\u00b0");
 483                 } else {
 484                         snprintf(buf,256, "%d\u00b0", (i * 45));
 485                 }
 486                 cairo_text_extents(cr, buf, &t_ext);
 487                 cairo_move_to(cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
 488                 cairo_show_text(cr, buf);
 489
 490                 if (i == 0)
 491                         continue;
 492
 493
 494                 cairo_set_source_rgba(cr, .8, .9, 0.2, 0.6/(float)i);
 495                 cairo_move_to(cr, 0.0,            y);
 496                 cairo_line_to(cr, _analysis_width, y);
 497
 498
 499                 y = _analysis_height/2.0 + (float)i*(_analysis_height/8.0)*PHASE_PROPORTION;
 500
 501                 // label
 502                 snprintf(buf,256, "-%d\u00b0", (i * 45));
 503                 cairo_set_source_rgb(cr, .8, .9, 0.2);
 504                 cairo_text_extents(cr, buf, &t_ext);
 505                 cairo_move_to(cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
 506                 cairo_show_text(cr, buf);
 507
 508                 // line
 509                 cairo_set_source_rgba(cr, .8, .9, 0.2, 0.6/(float)i);
 510                 cairo_move_to(cr, 0.0,            y);
 511                 cairo_line_to(cr, _analysis_width, y);
 512
 513                 cairo_set_line_width (cr, 0.25 + 1.0/(float)(i+1));
 514                 cairo_stroke(cr);
 515         }
 516 }
 517
 518 void
 519 PluginEqGui::plot_impulse_phase(Gtk::Widget *w, cairo_t *cr)
 520 {
 521         float x,y;
 522
 523         int prevX = 0;
 524         float avgY = 0.0;
 525         int avgNum = 0;
 526
 527         // float width  = w->get_width();
 528         float height = w->get_height();
 529
 530         cairo_set_source_rgba(cr, 0.95, 0.3, 0.2, 1.0);
 531         for (uint32_t i = 0; i < _impulse_fft->bins()-1; i++) {
 532                 // x coordinate of bin i
 533                 x  = log10f(1.0 + (float)i / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 534                 x *= _analysis_width;
 535
 536                 y  = _analysis_height/2.0 - (_impulse_fft->phase_at_bin(i)/M_PI)*(_analysis_height/2.0)*PHASE_PROPORTION;
 537
 538                 if ( i == 0 ) {
 539                         cairo_move_to(cr, x, y);
 540
 541                         avgY = 0;
 542                         avgNum = 0;
 543                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 544                         avgY = avgY/(float)avgNum;
 545                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 546                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 547                         cairo_line_to(cr, prevX, avgY);
 548                         //cairo_line_to(cr, prevX, avgY/(float)avgNum);
 549
 550                         avgY = 0;
 551                         avgNum = 0;
 552
 553                 }
 554
 555                 prevX = rint(x);
 556                 avgY += y;
 557                 avgNum++;
 558         }
 559
 560         cairo_set_line_width (cr, 2.0);
 561         cairo_stroke(cr);
 562 }
 563
 564 void
 565 PluginEqGui::draw_scales_power(Gtk::Widget */*w*/, cairo_t *cr)
 566 {
 567         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 };
 568
 569         float divisor = _samplerate / 2.0 / _impulse_fft->bins();
 570         float x;
 571
 572         cairo_set_line_width (cr, 1.5);
 573         cairo_set_font_size(cr, 9);
 574
 575         cairo_font_extents_t extents;
 576         cairo_font_extents(cr, &extents);
 577         // float fontXOffset = extents.descent + 1.0;
 578
 579         char buf[256];
 580
 581         for (uint32_t i = 0; scales[i] != -1.0; ++i) {
 582                 float bin = scales[i] / divisor;
 583
 584                 x  = log10f(1.0 + bin / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 585                 x *= _analysis_width;
 586
 587                 if (scales[i] < 1000.0) {
 588                         snprintf(buf, 256, "%0.0f", scales[i]);
 589                 } else {
 590                         snprintf(buf, 256, "%0.0fk", scales[i]/1000.0);
 591                 }
 592
 593                 cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 594
 595                 //cairo_move_to(cr, x + fontXOffset, 3.0);
 596                 cairo_move_to(cr, x - extents.height, 3.0);
 597
 598                 cairo_rotate(cr, M_PI / 2.0);
 599                 cairo_show_text(cr, buf);
 600                 cairo_rotate(cr, -M_PI / 2.0);
 601                 cairo_stroke(cr);
 602
 603                 cairo_set_source_rgb(cr, 0.3, 0.3, 0.3);
 604                 cairo_move_to(cr, x, _analysis_height);
 605                 cairo_line_to(cr, x, 0.0);
 606                 cairo_stroke(cr);
 607         }
 608
 609         float y;
 610
 611         //double dashes[] = { 1.0, 3.0, 4.5, 3.0 };
 612         double dashes[] = { 3.0, 5.0 };
 613
 614         for (float dB = 0.0; dB < _max_dB; dB += _step_dB ) {
 615                 snprintf(buf, 256, "+%0.0f", dB );
 616
 617                 y  = ( _max_dB - dB) / ( _max_dB - _min_dB );
 618                 //std::cerr << " y = " << y << std::endl;
 619                 y *= _analysis_height;
 620
 621                 if (dB != 0.0) {
 622                         cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 623                         cairo_move_to(cr, 1.0,     y + extents.height + 1.0);
 624                         cairo_show_text(cr, buf);
 625                         cairo_stroke(cr);
 626                 }
 627
 628                 cairo_set_source_rgb(cr, 0.2, 0.2, 0.2);
 629                 cairo_move_to(cr, 0,     y);
 630                 cairo_line_to(cr, _analysis_width, y);
 631                 cairo_stroke(cr);
 632
 633                 if (dB == 0.0) {
 634                         cairo_set_dash(cr, dashes, 2, 0.0);
 635                 }
 636         }
 637
 638
 639
 640         for (float dB = - _step_dB; dB > _min_dB; dB -= _step_dB ) {
 641                 snprintf(buf, 256, "%0.0f", dB );
 642
 643                 y  = ( _max_dB - dB) / ( _max_dB - _min_dB );
 644                 y *= _analysis_height;
 645
 646                 cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 647                 cairo_move_to(cr, 1.0,     y - extents.descent - 1.0);
 648                 cairo_show_text(cr, buf);
 649                 cairo_stroke(cr);
 650
 651                 cairo_set_source_rgb(cr, 0.2, 0.2, 0.2);
 652                 cairo_move_to(cr, 0,     y);
 653                 cairo_line_to(cr, _analysis_width, y);
 654                 cairo_stroke(cr);
 655         }
 656
 657         cairo_set_dash(cr, 0, 0, 0.0);
 658
 659 }
 660
 661 inline float
 662 power_to_dB(float a)
 663 {
 664         return 10.0 * log10f(a);
 665 }
 666
 667 void
 668 PluginEqGui::plot_impulse_amplitude(Gtk::Widget *w, cairo_t *cr)
 669 {
 670         float x,y;
 671
 672         int prevX = 0;
 673         float avgY = 0.0;
 674         int avgNum = 0;
 675
 676         // float width  = w->get_width();
 677         float height = w->get_height();
 678
 679         cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
 680         cairo_set_line_width (cr, 2.5);
 681
 682         for (uint32_t i = 0; i < _impulse_fft->bins()-1; i++) {
 683                 // x coordinate of bin i
 684                 x  = log10f(1.0 + (float)i / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
 685                 x *= _analysis_width;
 686
 687                 float yCoeff = ( power_to_dB(_impulse_fft->power_at_bin(i)) - _min_dB) / (_max_dB - _min_dB);
 688
 689                 y = _analysis_height - _analysis_height*yCoeff;
 690
 691                 if ( i == 0 ) {
 692                         cairo_move_to(cr, x, y);
 693
 694                         avgY = 0;
 695                         avgNum = 0;
 696                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 697                         avgY = avgY/(float)avgNum;
 698                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 699                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 700                         cairo_line_to(cr, prevX, avgY);
 701                         //cairo_line_to(cr, prevX, avgY/(float)avgNum);
 702
 703                         avgY = 0;
 704                         avgNum = 0;
 705
 706                 }
 707
 708                 prevX = rint(x);
 709                 avgY += y;
 710                 avgNum++;
 711         }
 712
 713         cairo_stroke(cr);
 714 }
 715
 716 void
 717 PluginEqGui::plot_signal_amplitude_difference(Gtk::Widget *w, cairo_t *cr)
 718 {
 719         float x,y;
 720
 721         int prevX = 0;
 722         float avgY = 0.0;
 723         int avgNum = 0;
 724
 725         // float width  = w->get_width();
 726         float height = w->get_height();
 727
 728         cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
 729         cairo_set_line_width (cr, 2.5);
 730
 731         for (uint32_t i = 0; i < _signal_input_fft->bins()-1; i++) {
 732                 // x coordinate of bin i
 733                 x  = log10f(1.0 + (float)i / (float)_signal_input_fft->bins() * _log_coeff) / _log_max;
 734                 x *= _analysis_width;
 735
 736                 float power_out = power_to_dB(_signal_output_fft->power_at_bin(i));
 737                 float power_in  = power_to_dB(_signal_input_fft ->power_at_bin(i));
 738                 float power = power_out - power_in;
 739
 740                 // for SaBer
 741                 /*
 742                 double p = 10.0 * log10( 1.0 + (double)_signal_output_fft->power_at_bin(i) - (double)
 743  - _signal_input_fft ->power_at_bin(i));
 744                 //p *= 1000000.0;
 745                 float power = (float)p;
 746
 747                 if ( (i % 1000) == 0) {
 748                         std::cerr << i << ": " << power << std::endl;
 749                 }
 750                 */
 751
 752                 if (std::isinf(power)) {
 753                         if (power < 0) {
 754                                 power = _min_dB - 1.0;
 755                         } else {
 756                                 power = _max_dB - 1.0;
 757                         }
 758                 } else if (std::isnan(power)) {
 759                         power = _min_dB - 1.0;
 760                 }
 761
 762                 float yCoeff = ( power - _min_dB) / (_max_dB - _min_dB);
 763
 764                 y = _analysis_height - _analysis_height*yCoeff;
 765
 766                 if ( i == 0 ) {
 767                         cairo_move_to(cr, x, y);
 768
 769                         avgY = 0;
 770                         avgNum = 0;
 771                 } else if (rint(x) > prevX || i == _impulse_fft->bins()-1 ) {
 772                         avgY = avgY/(float)avgNum;
 773                         if (avgY > (height * 10.0) ) avgY = height * 10.0;
 774                         if (avgY < (-height * 10.0) ) avgY = -height * 10.0;
 775                         cairo_line_to(cr, prevX, avgY);
 776
 777                         avgY = 0;
 778                         avgNum = 0;
 779
 780                 }
 781
 782                 prevX = rint(x);
 783                 avgY += y;
 784                 avgNum++;
 785         }
 786
 787         cairo_stroke(cr);
 788
 789
 790 }