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