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livetrax/gtk2_ardour/fft_graph.cc

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/*
Copyright (C) 2006 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <glibmm.h>
#include <glibmm/refptr.h>
#include <gdkmm/gc.h>
#include <gtkmm/widget.h>
#include <gtkmm/style.h>
#include <gtkmm/treemodel.h>
#include <gtkmm/treepath.h>
#include <pbd/stl_delete.h>
#include <math.h>
#include "fft_graph.h"
#include "analysis_window.h"
using namespace std;
using namespace Gtk;
using namespace Gdk;
FFTGraph::FFTGraph(int windowSize)
{
_logScale = 0;
_in = 0;
_out = 0;
_hanning = 0;
_logScale = 0;
_a_window = 0;
setWindowSize(windowSize);
}
void
FFTGraph::setWindowSize(int windowSize)
{
if (_a_window) {
Glib::Mutex::Lock lm (_a_window->track_list_lock);
setWindowSize_internal(windowSize);
} else {
setWindowSize_internal(windowSize);
}
}
void
FFTGraph::setWindowSize_internal(int windowSize)
{
// remove old tracklist & graphs
if (_a_window) {
_a_window->clear_tracklist();
}
_windowSize = windowSize;
_dataSize = windowSize / 2;
if (_in != 0) {
fftwf_destroy_plan(_plan);
free(_in);
_in = 0;
}
if (_out != 0) {
free(_out);
_out = 0;
}
if (_hanning != 0) {
free(_hanning);
_hanning = 0;
}
if (_logScale != 0) {
free(_logScale);
_logScale = 0;
}
// When destroying, window size is set to zero to free up memory
if (windowSize == 0)
return;
// FFT input & output buffers
_in = (float *) fftwf_malloc(sizeof(float) * _windowSize);
_out = (float *) fftwf_malloc(sizeof(float) * _windowSize);
// Hanning window
_hanning = (float *) malloc(sizeof(float) * _windowSize);
// normalize the window
double sum = 0.0;
for (int i=0; i < _windowSize; i++) {
_hanning[i]=0.81f * ( 0.5f - (0.5f * (float) cos(2.0f * M_PI * (float)i / (float)(_windowSize))));
sum += _hanning[i];
}
double isum = 1.0 / sum;
for (int i=0; i < _windowSize; i++) {
_hanning[i] *= isum;
}
_logScale = (int *) malloc(sizeof(int) * _dataSize);
//float count = 0;
for (int i = 0; i < _dataSize; i++) {
_logScale[i] = 0;
}
_plan = fftwf_plan_r2r_1d(_windowSize, _in, _out, FFTW_R2HC, FFTW_ESTIMATE);
}
FFTGraph::~FFTGraph()
{
// This will free everything
setWindowSize(0);
}
bool
FFTGraph::on_expose_event (GdkEventExpose* event)
{
redraw();
return true;
}
FFTResult *
FFTGraph::prepareResult(Gdk::Color color, string trackname)
{
FFTResult *res = new FFTResult(this, color, trackname);
return res;
}
void
FFTGraph::analyze(float *window, float *composite)
{
int i;
// Copy the data and apply the hanning window
for (i = 0; i < _windowSize; i++) {
_in[i] = window[ i ] * _hanning[ i ];
}
fftwf_execute(_plan);
composite[0] += (_out[0] * _out[0]);
for (i=1; i < _dataSize - 1; i++) { // TODO: check with Jesse whether this is really correct
composite[i] += (_out[i] * _out[i]) + (_out[_windowSize-i] * _out[_windowSize-i]);
}
}
void
FFTGraph::set_analysis_window(AnalysisWindow *a_window)
{
_a_window = a_window;
}
void
FFTGraph::draw_scales(Glib::RefPtr<Gdk::Window> window)
{
Glib::RefPtr<Gtk::Style> style = get_style();
Glib::RefPtr<Gdk::GC> black = style->get_black_gc();
Glib::RefPtr<Gdk::GC> white = style->get_white_gc();
window->draw_rectangle(black, true, 0, 0, width, height);
/**
* 4 5
* _ _
* | |
* 1 | | 2
* |________|
* 3
**/
// Line 1
window->draw_line(white, h_margin, v_margin, h_margin, height - v_margin );
// Line 2
window->draw_line(white, width - h_margin, v_margin, width - h_margin, height - v_margin );
// Line 3
window->draw_line(white, h_margin, height - v_margin, width - h_margin, height - v_margin );
#define DB_METRIC_LENGTH 8
// Line 5
window->draw_line(white, h_margin - DB_METRIC_LENGTH, v_margin, h_margin, v_margin );
// Line 6
window->draw_line(white, width - h_margin, v_margin, width - h_margin + DB_METRIC_LENGTH, v_margin );
if (graph_gc == 0) {
graph_gc = GC::create( get_window() );
}
Color grey;
grey.set_rgb_p(0.2, 0.2, 0.2);
graph_gc->set_rgb_fg_color( grey );
if (layout == 0) {
layout = create_pango_layout ("");
layout->set_font_description (get_style()->get_font());
}
// Draw logscale
int logscale_pos = 0;
int position_on_scale;
for (int x = 1; x < 8; x++) {
position_on_scale = (int)floor( (double)scaleWidth*(double)x/8.0);
while (_logScale[logscale_pos] < position_on_scale)
logscale_pos++;
int coord = (int)(v_margin + 1.0 + position_on_scale);
int SR = 44100;
int rate_at_pos = (int)((double)(SR/2) * (double)logscale_pos / (double)_dataSize);
char buf[32];
if (rate_at_pos < 1000)
snprintf(buf,32,"%dHz",rate_at_pos);
else
snprintf(buf,32,"%dk",(int)floor( (float)rate_at_pos/(float)1000) );
std::string label = buf;
layout->set_text(label);
window->draw_line(graph_gc, coord, v_margin, coord, height - v_margin);
int width, height;
layout->get_pixel_size (width, height);
window->draw_layout(white, coord - width / 2, v_margin / 2, layout);
}
}
void
FFTGraph::redraw()
{
Glib::Mutex::Lock lm (_a_window->track_list_lock);
draw_scales(get_window());
if (_a_window == 0)
return;
if (!_a_window->track_list_ready)
return;
// Find "session wide" min & max
float min = 1000000000000.0;
float max = -1000000000000.0;
TreeNodeChildren track_rows = _a_window->track_list.get_model()->children();
for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
TreeModel::Row row = *i;
FFTResult *res = row[_a_window->tlcols.graph];
// disregard fft analysis from empty signals
if (res->minimum() == res->maximum()) {
continue;
}
if ( res->minimum() < min) {
min = res->minimum();
}
if ( res->maximum() > max) {
max = res->maximum();
}
}
int graph_height = height - 2 * h_margin;
if (graph_gc == 0) {
graph_gc = GC::create( get_window() );
}
double pixels_per_db = (double)graph_height / (double)(max - min);
for (TreeIter i = track_rows.begin(); i != track_rows.end(); i++) {
TreeModel::Row row = *i;
// don't show graphs for tracks which are deselected
if (!row[_a_window->tlcols.visible]) {
continue;
}
FFTResult *res = row[_a_window->tlcols.graph];
// don't show graphs for empty signals
if (res->minimum() == res->maximum()) {
continue;
}
std::string name = row[_a_window->tlcols.trackname];
// Set color from track
graph_gc->set_rgb_fg_color( res->get_color() );
float mpp = -1000000.0;
int prevx = 0;
float prevSample = min;
for (int x = 0; x < res->length() - 1; x++) {
if (res->sampleAt(x) > mpp)
mpp = res->sampleAt(x);
// If the next point on the log scale is at the same location,
// don't draw yet
if (x + 1 < res->length() &&
_logScale[x] == _logScale[x + 1]) {
continue;
}
get_window()->draw_line(
graph_gc,
v_margin + 1 + prevx,
graph_height - (int)floor( (prevSample - min) * pixels_per_db) + h_margin - 1,
v_margin + 1 + _logScale[x],
graph_height - (int)floor( (mpp - min) * pixels_per_db) + h_margin - 1);
prevx = _logScale[x];
prevSample = mpp;
mpp = -1000000.0;
}
}
}
void
FFTGraph::on_size_request(Gtk::Requisition* requisition)
{
width = scaleWidth + h_margin * 2;
height = scaleHeight + 2 + v_margin * 2;
if (_logScale != 0) {
free(_logScale);
}
_logScale = (int *) malloc(sizeof(int) * _dataSize);
float SR = 44100;
float FFT_START = SR/(double)_dataSize;
float FFT_END = SR/2.0;
float FFT_RANGE = log( FFT_END / FFT_START);
float pixel = 0;
for (int i = 0; i < _dataSize; i++) {
float freq_at_bin = (SR/2.0) * ((double)i / (double)_dataSize);
float freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)scaleWidth );
while (freq_at_bin > freq_at_pixel) {
pixel++;
freq_at_pixel = FFT_START * exp( FFT_RANGE * pixel / (double)scaleWidth );
}
_logScale[i] = (int)floor(pixel);
//printf("logscale at %d = %3.3f, freq_at_pixel %3.3f, freq_at_bin %3.3f, scaleWidth %d\n", i, pixel, freq_at_pixel, freq_at_bin, scaleWidth);
}
requisition->width = width;;
requisition->height = height;
}
void
FFTGraph::on_size_allocate(Gtk::Allocation & alloc)
{
width = alloc.get_width();
height = alloc.get_height();
DrawingArea::on_size_allocate (alloc);
}