484 lines
11 KiB
C++
484 lines
11 KiB
C++
/*
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Copyright (C) 2006 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <iostream>
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#include <glibmm.h>
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#include <glibmm/refptr.h>
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#include <gdkmm/gc.h>
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#include <gtkmm/widget.h>
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#include <gtkmm/style.h>
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#include <gtkmm/treemodel.h>
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#include <gtkmm/treepath.h>
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#include <pbd/stl_delete.h>
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#include <math.h>
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#include "fft_graph.h"
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#include "analysis_window.h"
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using namespace std;
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using namespace Gtk;
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using namespace Gdk;
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FFTGraph::FFTGraph(int windowSize)
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{
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_logScale = 0;
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_in = 0;
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_out = 0;
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_hanning = 0;
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_logScale = 0;
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_a_window = 0;
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_show_minmax = false;
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_show_normalized = false;
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setWindowSize(windowSize);
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}
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void
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FFTGraph::setWindowSize(int windowSize)
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{
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if (_a_window) {
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Glib::Mutex::Lock lm (_a_window->track_list_lock);
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setWindowSize_internal(windowSize);
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} else {
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setWindowSize_internal(windowSize);
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}
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}
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void
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FFTGraph::setWindowSize_internal(int windowSize)
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{
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// remove old tracklist & graphs
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if (_a_window) {
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_a_window->clear_tracklist();
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}
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_windowSize = windowSize;
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_dataSize = windowSize / 2;
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if (_in != 0) {
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fftwf_destroy_plan(_plan);
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free(_in);
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_in = 0;
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}
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if (_out != 0) {
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free(_out);
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_out = 0;
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}
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if (_hanning != 0) {
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free(_hanning);
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_hanning = 0;
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}
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if (_logScale != 0) {
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free(_logScale);
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_logScale = 0;
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}
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// When destroying, window size is set to zero to free up memory
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if (windowSize == 0)
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return;
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// FFT input & output buffers
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_in = (float *) fftwf_malloc(sizeof(float) * _windowSize);
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_out = (float *) fftwf_malloc(sizeof(float) * _windowSize);
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// Hanning window
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_hanning = (float *) malloc(sizeof(float) * _windowSize);
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// normalize the window
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double sum = 0.0;
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for (int i=0; i < _windowSize; i++) {
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_hanning[i]=0.81f * ( 0.5f - (0.5f * (float) cos(2.0f * M_PI * (float)i / (float)(_windowSize))));
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sum += _hanning[i];
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}
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double isum = 1.0 / sum;
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for (int i=0; i < _windowSize; i++) {
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_hanning[i] *= isum;
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}
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_logScale = (int *) malloc(sizeof(int) * _dataSize);
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//float count = 0;
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for (int i = 0; i < _dataSize; i++) {
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_logScale[i] = 0;
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}
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_plan = fftwf_plan_r2r_1d(_windowSize, _in, _out, FFTW_R2HC, FFTW_ESTIMATE);
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}
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FFTGraph::~FFTGraph()
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{
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// This will free everything
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setWindowSize(0);
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}
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bool
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FFTGraph::on_expose_event (GdkEventExpose* event)
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{
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redraw();
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return true;
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}
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FFTResult *
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FFTGraph::prepareResult(Gdk::Color color, string trackname)
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{
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FFTResult *res = new FFTResult(this, color, trackname);
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return res;
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}
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void
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FFTGraph::set_analysis_window(AnalysisWindow *a_window)
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{
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_a_window = a_window;
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}
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void
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FFTGraph::draw_scales(Glib::RefPtr<Gdk::Window> window)
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{
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Glib::RefPtr<Gtk::Style> style = get_style();
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Glib::RefPtr<Gdk::GC> black = style->get_black_gc();
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Glib::RefPtr<Gdk::GC> white = style->get_white_gc();
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window->draw_rectangle(black, true, 0, 0, width, height);
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/**
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* 4 5
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* _ _
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* | |
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* 1 | | 2
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* |________|
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* 3
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**/
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// Line 1
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window->draw_line(white, h_margin, v_margin, h_margin, height - v_margin );
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// Line 2
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window->draw_line(white, width - h_margin + 1, v_margin, width - h_margin + 1, height - v_margin );
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// Line 3
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window->draw_line(white, h_margin, height - v_margin, width - h_margin, height - v_margin );
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#define DB_METRIC_LENGTH 8
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// Line 4
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window->draw_line(white, h_margin - DB_METRIC_LENGTH, v_margin, h_margin, v_margin );
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// Line 5
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window->draw_line(white, width - h_margin + 1, v_margin, width - h_margin + DB_METRIC_LENGTH, v_margin );
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if (graph_gc == 0) {
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graph_gc = GC::create( get_window() );
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}
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Color grey;
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grey.set_rgb_p(0.2, 0.2, 0.2);
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graph_gc->set_rgb_fg_color( grey );
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if (layout == 0) {
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layout = create_pango_layout ("");
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layout->set_font_description (get_style()->get_font());
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}
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// Draw logscale
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int logscale_pos = 0;
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int position_on_scale;
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/* TODO, write better scales and change the log function so that octaves are of equal pixel length
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float scale_points[10] = { 55.0, 110.0, 220.0, 440.0, 880.0, 1760.0, 3520.0, 7040.0, 14080.0, 28160.0 };
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for (int x = 0; x < 10; x++) {
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// i = 0.. _dataSize-1
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float freq_at_bin = (SR/2.0) * ((double)i / (double)_dataSize);
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freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)(currentScaleWidth - 1) );
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}
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*/
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for (int x = 1; x < 8; x++) {
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position_on_scale = (int)floor( (double)currentScaleWidth*(double)x/8.0);
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while (_logScale[logscale_pos] < position_on_scale)
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logscale_pos++;
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int coord = (int)(v_margin + 1.0 + position_on_scale);
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int SR = 44100;
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int rate_at_pos = (int)((double)(SR/2) * (double)logscale_pos / (double)_dataSize);
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char buf[32];
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if (rate_at_pos < 1000)
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snprintf(buf,32,"%dHz",rate_at_pos);
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else
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snprintf(buf,32,"%dk",(int)floor( (float)rate_at_pos/(float)1000) );
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std::string label = buf;
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layout->set_text(label);
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window->draw_line(graph_gc, coord, v_margin, coord, height - v_margin - 1);
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int width, height;
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layout->get_pixel_size (width, height);
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window->draw_layout(white, coord - width / 2, v_margin / 2, layout);
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}
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}
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void
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FFTGraph::redraw()
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{
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Glib::Mutex::Lock lm (_a_window->track_list_lock);
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draw_scales(get_window());
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if (_a_window == 0)
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return;
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if (!_a_window->track_list_ready)
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return;
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cairo_t *cr;
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cr = gdk_cairo_create(GDK_DRAWABLE(get_window()->gobj()));
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cairo_set_line_width(cr, 1.5);
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cairo_translate(cr, (float)v_margin + 1.0, (float)h_margin);
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// Find "session wide" min & max
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float min = 1000000000000.0;
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float max = -1000000000000.0;
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TreeNodeChildren track_rows = _a_window->track_list.get_model()->children();
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for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
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TreeModel::Row row = *i;
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FFTResult *res = row[_a_window->tlcols.graph];
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// disregard fft analysis from empty signals
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if (res->minimum() == res->maximum()) {
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continue;
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}
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if ( res->minimum() < min) {
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min = res->minimum();
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}
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if ( res->maximum() > max) {
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max = res->maximum();
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}
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}
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if (!_show_normalized) {
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min = -150.0f;
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max = 0.0f;
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}
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//int graph_height = height - 2 * h_margin;
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float fft_pane_size_w = (float)(width - 2*v_margin) - 1.0;
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float fft_pane_size_h = (float)(height - 2*h_margin);
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double pixels_per_db = (double)fft_pane_size_h / (double)(max - min);
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cairo_rectangle(cr, 0.0, 0.0, fft_pane_size_w, fft_pane_size_h);
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cairo_clip(cr);
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for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
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TreeModel::Row row = *i;
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// don't show graphs for tracks which are deselected
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if (!row[_a_window->tlcols.visible]) {
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continue;
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}
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FFTResult *res = row[_a_window->tlcols.graph];
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// don't show graphs for empty signals
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if (res->minimum() == res->maximum()) {
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continue;
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}
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float mpp;
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if (_show_minmax) {
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mpp = -1000000.0;
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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);
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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) ));
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// Draw the line of maximum values
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for (int x = 1; x < res->length(); x++) {
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if (res->maxAt(x) > mpp)
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mpp = res->maxAt(x);
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mpp = fmax(mpp, min);
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mpp = fmin(mpp, max);
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// If the next point on the log scale is at the same location,
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// don't draw yet
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if (x + 1 < res->length() && _logScale[x] == _logScale[x + 1]) {
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continue;
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}
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float X = 0.5f + (float)_logScale[x];
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float Y = 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) );
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cairo_line_to(cr, X, Y);
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mpp = -1000000.0;
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}
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mpp = +10000000.0;
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// Draw back to the start using the minimum value
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for (int x = res->length()-1; x >= 0; x--) {
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if (res->minAt(x) < mpp)
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mpp = res->minAt(x);
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mpp = fmax(mpp, min);
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mpp = fmin(mpp, max);
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// If the next point on the log scale is at the same location,
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// don't draw yet
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if (x - 1 > 0 && _logScale[x] == _logScale[x - 1]) {
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continue;
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}
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float X = 0.5f + (float)_logScale[x];
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float Y = 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) );
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cairo_line_to(cr, X, Y );
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mpp = +10000000.0;
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}
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cairo_close_path(cr);
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cairo_fill(cr);
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}
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// Set color from track
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cairo_set_source_rgb(cr, res->get_color().get_red_p(), res->get_color().get_green_p(), res->get_color().get_blue_p());
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mpp = -1000000.0;
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cairo_move_to(cr, 0.5, fft_pane_size_h-0.5);
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for (int x = 0; x < res->length(); x++) {
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if (res->avgAt(x) > mpp)
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mpp = res->avgAt(x);
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mpp = fmax(mpp, min);
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mpp = fmin(mpp, max);
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// If the next point on the log scale is at the same location,
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// don't draw yet
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if (x + 1 < res->length() && _logScale[x] == _logScale[x + 1]) {
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continue;
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}
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cairo_line_to(cr, 0.5f + (float)_logScale[x], 0.5f + (float)( fft_pane_size_h - (int)floor( (mpp - min) * pixels_per_db) ));
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mpp = -1000000.0;
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}
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cairo_stroke(cr);
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}
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cairo_destroy(cr);
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}
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void
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FFTGraph::on_size_request(Gtk::Requisition* requisition)
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{
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width = max(requisition->width, minScaleWidth + h_margin * 2);
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height = max(requisition->height, minScaleHeight + 2 + v_margin * 2);
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update_size();
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requisition->width = width;;
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requisition->height = height;
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}
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void
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FFTGraph::on_size_allocate(Gtk::Allocation & alloc)
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{
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width = alloc.get_width();
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height = alloc.get_height();
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update_size();
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DrawingArea::on_size_allocate (alloc);
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}
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void
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FFTGraph::update_size()
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{
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currentScaleWidth = width - h_margin*2;
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currentScaleHeight = height - 2 - v_margin*2;
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float SR = 44100;
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float FFT_START = SR/(double)_dataSize;
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float FFT_END = SR/2.0;
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float FFT_RANGE = log( FFT_END / FFT_START);
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float pixel = 0;
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for (int i = 0; i < _dataSize; i++) {
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float freq_at_bin = (SR/2.0) * ((double)i / (double)_dataSize);
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float freq_at_pixel;
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pixel--;
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do {
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pixel++;
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freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)(currentScaleWidth - 1) );
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} while (freq_at_bin > freq_at_pixel);
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_logScale[i] = (int)floor(pixel);
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}
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}
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