From 115dd772216dc43c8b43912050f4e428ecf81a5d Mon Sep 17 00:00:00 2001
From: Jens Ahrensfeld <jens@jayfield.org>
Date: Wed, 15 Jun 2022 06:10:40 +0000
Subject: [PATCH] - fractional interpolation working

git-svn-id: http://moon:8086/svn/software/trunk/libsrc/cpp@973 b431acfa-c32f-4a4a-93f1-934dc6c82436
---
 radio/interpolation/Farrow.hpp | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/radio/interpolation/Farrow.hpp b/radio/interpolation/Farrow.hpp
index b1922ae..e4e12ee 100644
--- a/radio/interpolation/Farrow.hpp
+++ b/radio/interpolation/Farrow.hpp
@@ -73,20 +73,29 @@ public:
 	
 	bool process_new(RealScalar dmu)
 	{
+#if 0		
+		while(m_bufferIn.len())
+		{
+			ComplexScalar xout;
+			m_bufferIn.consume(1);
+			m_bufferIn.read(&xout, 1, false);
+			m_bufferOut.write(&xout, 1);
+			std::cout << "xout: " << xout << std::endl;
+		};
+		std::cout << "----- SKIP -----" << std::endl;
+
+#else
 		while(true)
 		{
-			radio_float_t mu = m_interpolator.getMu();
 			size_t adv = m_interpolator.getAdv();
-			if (m_bufferIn.len() < adv)
-			{
-				std::cout << "----- SKIP -----" << std::endl;
-				break;
-			}
+			radio_float_t mu = m_interpolator.getMu();
 			if (adv)
 			{
-				ComplexScalar xout;
-				m_bufferIn.consume(adv);
-				m_bufferIn.read(&xout, 1, false);
+				if (m_bufferIn.len() < adv)
+				{
+					break;
+				}
+				ComplexScalar xout = m_bufferIn.readAt(adv-1);
 				FirComplex::feed(xout);
 
 				// Partial filter responses
@@ -95,13 +104,15 @@ public:
 					m_h[i] = FirComplex::processReal(column(m_coeff, i));
 				}
 			}
-			m_interpolator.process(dmu);
 
 			// Combine
 			ComplexScalar yout = horner(mu);
 			m_bufferOut.write(&yout, 1);
 
+			m_interpolator.process(dmu);
+
 		}
+#endif
 		return true;
 	}