First commit on FFT analysis window. Still some functionality missing,

but it's mostly done.


git-svn-id: svn://localhost/trunk/ardour2@383 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 97 insertions, 0 deletions

diff --git a/gtk2_ardour/fft_result.cc b/gtk2_ardour/fft_result.cc
new file mode 100644
index 0000000000..9a55b59cb5
--- /dev/null
+++ b/gtk2_ardour/fft_result.cc
@@ -0,0 +1,97 @@
+/*
+    Copyright (C) 2006 Paul Davis
+	Written by Sampo Savolainen
+
+    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 <fft_result.h>
+#include <fft_graph.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <iostream>
+
+using namespace std;
+
+FFTResult::FFTResult(FFTGraph *graph, Gdk::Color color, string trackname)
+{
+	_graph = graph;
+	
+	_windowSize = _graph->windowSize();
+	_dataSize   = _windowSize / 2;
+
+	_averages = 0;
+
+	_data = (float *) malloc(sizeof(float) * _dataSize);
+	memset(_data,0,sizeof(float) * _dataSize);
+
+	_color     = color;
+	_trackname = trackname;
+}
+
+void
+FFTResult::analyzeWindow(float *window)
+{
+	_graph->analyze(window, _data);
+	_averages++;
+}
+
+void
+FFTResult::finalize()
+{
+	if (_averages == 0) {
+		_minimum = 0.0;
+		_maximum = 0.0;
+		return;
+	}
+	
+	// Average & scale
+	for (int i = 0; i < _dataSize; i++) {
+		_data[i] /= _averages;
+		_data[i]  = 10.0f * log10f(_data[i]); 
+	}
+
+	// find min & max
+	_minimum = _maximum = _data[0];
+	
+	for (int i = 1; i < _dataSize; i++) {
+		if (_data[i] < _minimum        && !isinf(_data[i])) {
+			_minimum = _data[i];
+		} else if (_data[i] > _maximum && !isinf(_data[i])) {
+			_maximum = _data[i];
+		}
+	}
+
+	_averages = 0;
+}
+
+FFTResult::~FFTResult()
+{
+	free(_data);
+}
+
+
+float
+FFTResult::sampleAt(int x)
+{
+	if (x < 0 || x>= _dataSize)
+		return 0.0f;
+
+	return _data[x];
+}
+