add option to disable librtlsdr zero copy workaround

only disable workaround if zerocopy is disabled in librtlsdr otherwise expect significantly increased CPU use
wiedehopf · Apr 27, 2024 · f599f1b · f599f1b
1 parent 1d515cb
commit f599f1b
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Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/Makefile b/Makefile
@@ -38,6 +38,11 @@ else
   LIBS += -lncurses
 endif
 
+# only disable workaround if zerocopy is disabled in librtlsdr, otherwise expect significantly increased CPU use
+ifeq ($(DISABLE_RTLSDR_ZEROCOPY_WORKAROUND), yes)
+  CFLAGS += -DDISABLE_RTLSDR_ZEROCOPY_WORKAROUND
+endif
+
 ifeq ($(HISTORY), yes)
   CFLAGS += -DALL_JSON=1
 endif

diff --git a/sdr_rtlsdr.c b/sdr_rtlsdr.c
@@ -57,7 +57,7 @@
 
 #include <rtl-sdr.h>
 
-#if defined(__arm__) || defined(__aarch64__)
+#if (defined(__arm__) || defined(__aarch64__)) && !defined(DISABLE_RTLSDR_ZEROCOPY_WORKAROUND)
 // Assume we need to use a bounce buffer to avoid performance problems on Pis running kernel 5.x and using zerocopy
 #  define USE_BOUNCE_BUFFER
 #endif