From e7b24dd7da9de84e218f7d7be623f0cf8b9d1b9c Mon Sep 17 00:00:00 2001
From: "N.N." <martin_pi@users.sourceforge.net>
Date: Mon, 17 Feb 2003 14:12:16 +0000
Subject: This commit was generated by cvs2svn to compensate for changes in
 r415, which included commits to RCS files with non-trunk default branches.

svn path=/trunk/externals/dfx/; revision=416
---
 dfx-library/dfxmisc.cpp | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100755 dfx-library/dfxmisc.cpp

(limited to 'dfx-library/dfxmisc.cpp')

diff --git a/dfx-library/dfxmisc.cpp b/dfx-library/dfxmisc.cpp
new file mode 100755
index 0000000..9d2d814
--- /dev/null
+++ b/dfx-library/dfxmisc.cpp
@@ -0,0 +1,77 @@
+#ifndef __dfxmisc
+#include "dfxmisc.h"
+#endif
+
+
+/*
+//-----------------------------------------------------------------------------------------
+// the calculates the number of samples until the next musical measure starts
+
+long samplesToNextBar(VstTimeInfo *timeInfo)
+{
+  // default these values to something reasonable in case they are not available from the host
+  double currentBarStartPos = 0.0, currentPPQpos = 0.0, meterNumerator = 4.0;
+  double currentTempoBPS, numPPQ;
+  long numSamples;
+
+ 
+	// exit immediately if timeInfo got returned NULL - there's nothing we can do in that case
+	if (timeInfo == NULL)
+		return 0;
+	if (kVstTempoValid & timeInfo->flags)
+		currentTempoBPS = timeInfo->tempo / 60.0;
+	// there's no point in going on with this if the host isn't supplying tempo
+	else
+		return 0;
+
+	// get the song beat position of the beginning of the previous measure
+	if (kVstBarsValid & timeInfo->flags)
+		currentBarStartPos = timeInfo->barStartPos;
+
+	// get the song beat position of our precise current location
+	if (kVstPpqPosValid & timeInfo->flags)
+		currentPPQpos = timeInfo->ppqPos;
+
+	// get the numerator of the time signature - this is the number of beats per measure
+	if (kVstTimeSigValid & timeInfo->flags)
+		meterNumerator = (double) timeInfo->timeSigNumerator;
+	// it will screw up the while loop below bigtime if timeSigNumerator isn't a positive number
+	if (meterNumerator <= 0.0)
+		meterNumerator = 4.0;
+
+	// calculate the distance in beats to the upcoming measure beginning point
+	if (currentBarStartPos == currentPPQpos)
+		numPPQ = 0.0;
+	else
+		numPPQ = currentBarStartPos + meterNumerator - currentPPQpos;
+
+	// do this stuff because some hosts (Cubase) give kind of wacky barStartPos sometimes
+	while (numPPQ < 0.0)
+		numPPQ += meterNumerator;
+	while (numPPQ > meterNumerator)
+		numPPQ -= meterNumerator;
+
+	// convert the value for the distance to the next measure from beats to samples
+	numSamples = (long) ( numPPQ * timeInfo->sampleRate / currentTempoBPS );
+
+	// return the number of samples until the next measure
+	if (numSamples < 0)	// just protecting again against wacky values
+		return 0;
+	else
+		return numSamples;
+}
+*/
+
+//-----------------------------------------------------------------------------------------
+// computes the principle branch of the Lambert W function
+//    { LambertW(x) = W(x), where W(x) * exp(W(x)) = x }
+
+double LambertW(double input)
+{
+  double x = fabs(input);
+
+	if (x <= 500.0)
+		return 0.665 * ( 1.0 + (0.0195 * log(x+1.0)) ) * log(x+1.0) + 0.04;
+	else
+		return log(x-4.0) - ( (1.0 - 1.0/log(x)) * log(log(x)) );
+}
-- 
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