gtk2_ardour/fft_graph.cc

   1 /*
   2     Copyright (C) 2006 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <iostream>
  21
  22 #include <glibmm.h>
  23 #include <glibmm/refptr.h>
  24
  25 #include <gdkmm/gc.h>
  26
  27 #include <gtkmm/widget.h>
  28 #include <gtkmm/style.h>
  29 #include <gtkmm/treemodel.h>
  30 #include <gtkmm/treepath.h>
  31
  32 #include <pbd/stl_delete.h>
  33
  34 #include <math.h>
  35
  36 #include "fft_graph.h"
  37 #include "analysis_window.h"
  38
  39 using namespace std;
  40 using namespace Gtk;
  41 using namespace Gdk;
  42
  43 FFTGraph::FFTGraph(int windowSize)
  44 {
  45         _logScale = 0;
  46
  47         _in       = 0;
  48         _out      = 0;
  49         _hanning  = 0;
  50         _logScale = 0;
  51
  52         _a_window = 0;
  53
  54         _show_minmax     = false;
  55         _show_normalized = false;
  56
  57         setWindowSize(windowSize);
  58 }
  59
  60 void
  61 FFTGraph::setWindowSize(int windowSize)
  62 {
  63         if (_a_window) {
  64                 Glib::Mutex::Lock lm  (_a_window->track_list_lock);
  65                 setWindowSize_internal(windowSize);
  66         } else {
  67                 setWindowSize_internal(windowSize);
  68         }
  69 }
  70
  71 void
  72 FFTGraph::setWindowSize_internal(int windowSize)
  73 {
  74         // remove old tracklist & graphs
  75         if (_a_window) {
  76                 _a_window->clear_tracklist();
  77         }
  78
  79         _windowSize = windowSize;
  80         _dataSize = windowSize / 2;
  81         if (_in != 0) {
  82                 fftwf_destroy_plan(_plan);
  83                 free(_in);
  84                 _in = 0;
  85         }
  86
  87         if (_out != 0) {
  88                 free(_out);
  89                 _out = 0;
  90         }
  91
  92         if (_hanning != 0) {
  93                 free(_hanning);
  94                 _hanning = 0;
  95         }
  96
  97         if (_logScale != 0) {
  98                 free(_logScale);
  99                 _logScale = 0;
 100         }
 101
 102         // When destroying, window size is set to zero to free up memory
 103         if (windowSize == 0)
 104                 return;
 105
 106         // FFT input & output buffers
 107         _in      = (float *) fftwf_malloc(sizeof(float) * _windowSize);
 108         _out     = (float *) fftwf_malloc(sizeof(float) * _windowSize);
 109
 110         // Hanning window
 111         _hanning = (float *) malloc(sizeof(float) * _windowSize);
 112
 113
 114         // normalize the window
 115         double sum = 0.0;
 116
 117         for (int i=0; i < _windowSize; i++) {
 118                 _hanning[i]=0.81f * ( 0.5f - (0.5f * (float) cos(2.0f * M_PI * (float)i / (float)(_windowSize))));
 119                 sum += _hanning[i];
 120         }
 121
 122         double isum = 1.0 / sum;
 123
 124         for (int i=0; i < _windowSize; i++) {
 125                 _hanning[i] *= isum;
 126         }
 127
 128         _logScale = (int *) malloc(sizeof(int) * _dataSize);
 129         //float count = 0;
 130         for (int i = 0; i < _dataSize; i++) {
 131                 _logScale[i] = 0;
 132         }
 133         _plan = fftwf_plan_r2r_1d(_windowSize, _in, _out, FFTW_R2HC, FFTW_ESTIMATE);
 134 }
 135
 136 FFTGraph::~FFTGraph()
 137 {
 138         // This will free everything
 139         setWindowSize(0);
 140 }
 141
 142 bool
 143 FFTGraph::on_expose_event (GdkEventExpose* event)
 144 {
 145         redraw();
 146         return true;
 147 }
 148
 149 FFTResult *
 150 FFTGraph::prepareResult(Gdk::Color color, string trackname)
 151 {
 152         FFTResult *res = new FFTResult(this, color, trackname);
 153
 154         return res;
 155 }
 156
 157
 158 void
 159 FFTGraph::set_analysis_window(AnalysisWindow *a_window)
 160 {
 161         _a_window = a_window;
 162 }
 163
 164 void
 165 FFTGraph::draw_scales(Glib::RefPtr<Gdk::Window> window)
 166 {
 167
 168         Glib::RefPtr<Gtk::Style> style = get_style();
 169         Glib::RefPtr<Gdk::GC> black = style->get_black_gc();
 170         Glib::RefPtr<Gdk::GC> white = style->get_white_gc();
 171
 172         window->draw_rectangle(black, true, 0, 0, width, height);
 173
 174         /**
 175          *  4          5
 176          *  _          _
 177          *   |        |
 178          * 1 |        | 2
 179          *   |________|
 180          *        3
 181          **/
 182
 183         // Line 1
 184         window->draw_line(white, h_margin, v_margin, h_margin, height - v_margin );
 185
 186         // Line 2
 187         window->draw_line(white, width - h_margin + 1, v_margin, width - h_margin + 1, height - v_margin );
 188
 189         // Line 3
 190         window->draw_line(white, h_margin, height - v_margin, width - h_margin, height - v_margin );
 191
 192 #define DB_METRIC_LENGTH 8
 193         // Line 4
 194         window->draw_line(white, h_margin - DB_METRIC_LENGTH, v_margin, h_margin, v_margin );
 195
 196         // Line 5
 197         window->draw_line(white, width - h_margin + 1, v_margin, width - h_margin + DB_METRIC_LENGTH, v_margin );
 198
 199
 200
 201         if (graph_gc == 0) {
 202                 graph_gc = GC::create( get_window() );
 203         }
 204
 205         Color grey;
 206
 207         grey.set_rgb_p(0.2, 0.2, 0.2);
 208
 209         graph_gc->set_rgb_fg_color( grey );
 210
 211         if (layout == 0) {
 212                 layout = create_pango_layout ("");
 213                 layout->set_font_description (get_style()->get_font());
 214         }
 215
 216         // Draw logscale
 217         int logscale_pos = 0;
 218         int position_on_scale;
 219
 220
 221 /* TODO, write better scales and change the log function so that octaves are of equal pixel length
 222         float scale_points[10] = { 55.0, 110.0, 220.0, 440.0, 880.0, 1760.0, 3520.0, 7040.0, 14080.0, 28160.0 };
 223
 224         for (int x = 0; x < 10; x++) {
 225
 226                 // i = 0.. _dataSize-1
 227                 float freq_at_bin = (SR/2.0) * ((double)i / (double)_dataSize);
 228
 229
 230
 231                         freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)(currentScaleWidth - 1) );
 232         }
 233         */
 234
 235         for (int x = 1; x < 8; x++) {
 236                 position_on_scale = (int)floor( (double)currentScaleWidth*(double)x/8.0);
 237
 238                 while (_logScale[logscale_pos] < position_on_scale)
 239                         logscale_pos++;
 240
 241                 int coord = (int)(v_margin + 1.0 + position_on_scale);
 242
 243                 int SR = 44100;
 244
 245                 int rate_at_pos = (int)((double)(SR/2) * (double)logscale_pos / (double)_dataSize);
 246
 247                 char buf[32];
 248                 if (rate_at_pos < 1000)
 249                         snprintf(buf,32,"%dHz",rate_at_pos);
 250                 else
 251                         snprintf(buf,32,"%dk",(int)floor( (float)rate_at_pos/(float)1000) );
 252
 253                 std::string label = buf;
 254
 255                 layout->set_text(label);
 256
 257                 window->draw_line(graph_gc, coord, v_margin, coord, height - v_margin - 1);
 258
 259                 int width, height;
 260                 layout->get_pixel_size (width, height);
 261
 262                 window->draw_layout(white, coord - width / 2, v_margin / 2, layout);
 263
 264         }
 265
 266 }
 267
 268 void
 269 FFTGraph::redraw()
 270 {
 271         Glib::Mutex::Lock lm  (_a_window->track_list_lock);
 272
 273         draw_scales(get_window());
 274
 275
 276         if (_a_window == 0)
 277                 return;
 278
 279         if (!_a_window->track_list_ready)
 280                 return;
 281
 282         cairo_t *cr;
 283         cr = gdk_cairo_create(GDK_DRAWABLE(get_window()->gobj()));
 284         cairo_set_line_width(cr, 1.5);
 285         cairo_translate(cr, (float)v_margin + 1.0, (float)h_margin);
 286
 287
 288
 289         // Find "session wide" min & max
 290         float min =  1000000000000.0;
 291         float max = -1000000000000.0;
 292
 293         TreeNodeChildren track_rows = _a_window->track_list.get_model()->children();
 294
 295         for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
 296
 297                 TreeModel::Row row = *i;
 298                 FFTResult *res = row[_a_window->tlcols.graph];
 299
 300                 // disregard fft analysis from empty signals
 301                 if (res->minimum() == res->maximum()) {
 302                         continue;
 303                 }
 304
 305                 if ( res->minimum() < min) {
 306                         min = res->minimum();
 307                 }
 308
 309                 if ( res->maximum() > max) {
 310                         max = res->maximum();
 311                 }
 312         }
 313
 314         if (!_show_normalized) {
 315                 min = -150.0f;
 316                 max = 0.0f;
 317         }
 318
 319         //int graph_height = height - 2 * h_margin;
 320
 321
 322
 323         float fft_pane_size_w = (float)(width  - 2*v_margin) - 1.0;
 324         float fft_pane_size_h = (float)(height - 2*h_margin);
 325
 326         double pixels_per_db = (double)fft_pane_size_h / (double)(max - min);
 327
 328         cairo_rectangle(cr, 0.0, 0.0, fft_pane_size_w, fft_pane_size_h);
 329         cairo_clip(cr);
 330
 331         for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
 332
 333                 TreeModel::Row row = *i;
 334
 335                 // don't show graphs for tracks which are deselected
 336                 if (!row[_a_window->tlcols.visible]) {
 337                         continue;
 338                 }
 339
 340                 FFTResult *res = row[_a_window->tlcols.graph];
 341
 342                 // don't show graphs for empty signals
 343                 if (res->minimum() == res->maximum()) {
 344                         continue;
 345                 }
 346
 347                 float mpp;
 348
 349                 if (_show_minmax) {
 350                         mpp = -1000000.0;
 351
 352                         cairo_set_source_rgba(cr, res->get_color().get_red_p(), res->get_color().get_green_p(), res->get_color().get_blue_p(), 0.30);
 353                         cairo_move_to(cr, 0.5f + (float)_logScale[0], 0.5f + (float)( fft_pane_size_h - (int)floor( (res->maxAt(0) - min) * pixels_per_db) ));
 354
 355                         // Draw the line of maximum values
 356                         for (int x = 1; x < res->length(); x++) {
 357                                 if (res->maxAt(x) > mpp)
 358                                         mpp = res->maxAt(x);
 359                                 mpp = fmax(mpp, min);
 360                                 mpp = fmin(mpp, max);
 361
 362                                 // If the next point on the log scale is at the same location,
 363                                 // don't draw yet
 364                                 if (x + 1 < res->length() && _logScale[x] == _logScale[x + 1]) {
 365                                         continue;
 366                                 }
 367
 368                                 float X = 0.5f + (float)_logScale[x];
 369                                 float Y = 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) );
 370
 371                                 cairo_line_to(cr, X, Y);
 372
 373                                 mpp = -1000000.0;
 374                         }
 375
 376                         mpp = +10000000.0;
 377                         // Draw back to the start using the minimum value
 378                         for (int x = res->length()-1; x >= 0; x--) {
 379                                 if (res->minAt(x) < mpp)
 380                                         mpp = res->minAt(x);
 381                                 mpp = fmax(mpp, min);
 382                                 mpp = fmin(mpp, max);
 383
 384                                 // If the next point on the log scale is at the same location,
 385                                 // don't draw yet
 386                                 if (x - 1 > 0 && _logScale[x] == _logScale[x - 1]) {
 387                                         continue;
 388                                 }
 389
 390                                 float X = 0.5f + (float)_logScale[x];
 391                                 float Y = 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) );
 392
 393                                 cairo_line_to(cr, X, Y );
 394
 395                                 mpp = +10000000.0;
 396                         }
 397
 398                         cairo_close_path(cr);
 399
 400                         cairo_fill(cr);
 401                 }
 402
 403
 404
 405                 // Set color from track
 406                 cairo_set_source_rgb(cr, res->get_color().get_red_p(), res->get_color().get_green_p(), res->get_color().get_blue_p());
 407
 408                 mpp = -1000000.0;
 409
 410                 cairo_move_to(cr, 0.5, fft_pane_size_h-0.5);
 411
 412                 for (int x = 0; x < res->length(); x++) {
 413
 414
 415                         if (res->avgAt(x) > mpp)
 416                                 mpp = res->avgAt(x);
 417                         mpp = fmax(mpp, min);
 418                         mpp = fmin(mpp, max);
 419
 420                         // If the next point on the log scale is at the same location,
 421                         // don't draw yet
 422                         if (x + 1 < res->length() && _logScale[x] == _logScale[x + 1]) {
 423                                 continue;
 424                         }
 425
 426                         cairo_line_to(cr, 0.5f + (float)_logScale[x], 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) ));
 427
 428                         mpp = -1000000.0;
 429                 }
 430
 431                 cairo_stroke(cr);
 432         }
 433
 434         cairo_destroy(cr);
 435 }
 436
 437 void
 438 FFTGraph::on_size_request(Gtk::Requisition* requisition)
 439 {
 440         width  = max(requisition->width,  minScaleWidth  + h_margin * 2);
 441         height = max(requisition->height, minScaleHeight + 2 + v_margin * 2);
 442
 443         update_size();
 444
 445         requisition->width  = width;;
 446         requisition->height = height;
 447 }
 448
 449 void
 450 FFTGraph::on_size_allocate(Gtk::Allocation & alloc)
 451 {
 452         width = alloc.get_width();
 453         height = alloc.get_height();
 454
 455         update_size();
 456
 457         DrawingArea::on_size_allocate (alloc);
 458 }
 459
 460 void
 461 FFTGraph::update_size()
 462 {
 463         currentScaleWidth  = width - h_margin*2;
 464         currentScaleHeight = height - 2 - v_margin*2;
 465
 466         float SR = 44100;
 467         float FFT_START = SR/(double)_dataSize;
 468         float FFT_END = SR/2.0;
 469         float FFT_RANGE = log( FFT_END / FFT_START);
 470         float pixel = 0;
 471         for (int i = 0; i < _dataSize; i++) {
 472                 float freq_at_bin = (SR/2.0) * ((double)i / (double)_dataSize);
 473                 float freq_at_pixel;
 474                 pixel--;
 475                 do {
 476                         pixel++;
 477                         freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)(currentScaleWidth - 1) );
 478                 } while (freq_at_bin > freq_at_pixel);
 479
 480                 _logScale[i] = (int)floor(pixel);
 481         }
 482 }
 483