From e303948ffb99ffafec24c26b3a1c03d547178719 Mon Sep 17 00:00:00 2001
From: Dimitri Stolnikov <horiz0n@gmx.net>
Date: Thu, 3 Oct 2013 14:25:28 +0200
Subject: [PATCH] source/sink: initialize sample rate cache variable
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Thanks to Jiří Pinkava for bringing this up.
---
 lib/sink_impl.cc   | 3 ++-
 lib/sink_impl.h    | 1 +
 lib/source_impl.cc | 3 ++-
 lib/source_impl.h  | 1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/sink_impl.cc b/lib/sink_impl.cc
index 9362ae4..a3fb84d 100644
--- a/lib/sink_impl.cc
+++ b/lib/sink_impl.cc
@@ -65,7 +65,8 @@ osmosdr::sink::make( const std::string &args )
 sink_impl::sink_impl( const std::string &args )
   : gr::hier_block2 ("sink_impl",
         args_to_io_signature(args),
-        gr::io_signature::make(0, 0, 0))
+        gr::io_signature::make(0, 0, 0)),
+    _sample_rate(NAN)
 {
   size_t channel = 0;
   bool device_specified = false;
diff --git a/lib/sink_impl.h b/lib/sink_impl.h
index 9cf2843..3b95a19 100644
--- a/lib/sink_impl.h
+++ b/lib/sink_impl.h
@@ -71,6 +71,7 @@ public:
 private:
   std::vector< sink_iface * > _devs;
 
+  /* cache to prevent multiple device calls with the same value coming from grc */
   double _sample_rate;
   std::map< size_t, double > _center_freq;
   std::map< size_t, double > _freq_corr;
diff --git a/lib/source_impl.cc b/lib/source_impl.cc
index 075bd29..c26004b 100644
--- a/lib/source_impl.cc
+++ b/lib/source_impl.cc
@@ -91,7 +91,8 @@ osmosdr::source::make( const std::string &args )
 source_impl::source_impl( const std::string &args )
   : gr::hier_block2 ("source_impl",
         gr::io_signature::make(0, 0, 0),
-        args_to_io_signature(args))
+        args_to_io_signature(args)),
+    _sample_rate(NAN)
 {
   size_t channel = 0;
   bool device_specified = false;
diff --git a/lib/source_impl.h b/lib/source_impl.h
index e33f3d7..42ab021 100644
--- a/lib/source_impl.h
+++ b/lib/source_impl.h
@@ -78,6 +78,7 @@ public:
 private:
   std::vector< source_iface * > _devs;
 
+  /* cache to prevent multiple device calls with the same value coming from grc */
   double _sample_rate;
   std::map< size_t, double > _center_freq;
   std::map< size_t, double > _freq_corr;