diff --git a/host/CMakeLists.txt b/host/CMakeLists.txt
index 24669423..ad047d6a 100644
--- a/host/CMakeLists.txt
+++ b/host/CMakeLists.txt
@@ -87,6 +87,7 @@ endif()
 set(SOURCES
   ${CMAKE_BINARY_DIR}/version.c
   src/app.c
+  src/downsample_parser.c
 )
 
 add_subdirectory("${PROJECT_TOP}/common"          "${CMAKE_BINARY_DIR}/common")
diff --git a/host/include/downsample_parser.h b/host/include/downsample_parser.h
new file mode 100644
index 00000000..ef428279
--- /dev/null
+++ b/host/include/downsample_parser.h
@@ -0,0 +1,48 @@
+/**
+ * looking glass
+ * copyright © 2017-2023 the looking glass authors
+ * https://looking-glass.io
+ *
+ * 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., 59
+ * temple place, suite 330, boston, ma 02111-1307 usa
+ */
+
+#include <stdbool.h>
+#include "common/option.h"
+#include "common/vector.h"
+
+typedef struct
+{
+  unsigned int id;
+  bool         greater;
+  unsigned int x;
+  unsigned int y;
+  unsigned int targetX;
+  unsigned int targetY;
+}
+DownsampleRule;
+
+extern Vector downsampleRules;
+
+bool downsampleParser(struct Option * opt, const char * str);
+
+#define DOWNSAMPLE_PARSER(moduleName) \
+{ \
+  .module         = moduleName, \
+  .name           = "downsample", \
+  .description    = "Downsample rules, format: [>](width)x(height):(toWidth)x(toHeight)", \
+  .type           = OPTION_TYPE_STRING, \
+  .value.x_string = NULL, \
+  .parser         = downsampleParser \
+}
diff --git a/host/platform/Windows/capture/NVFBC/src/nvfbc.c b/host/platform/Windows/capture/NVFBC/src/nvfbc.c
index 65173be4..1a86bd9c 100644
--- a/host/platform/Windows/capture/NVFBC/src/nvfbc.c
+++ b/host/platform/Windows/capture/NVFBC/src/nvfbc.c
@@ -38,6 +38,8 @@
 #include <dwmapi.h>
 #include <d3d9.h>
 
+#include "downsample_parser.h"
+
 #include <NvFBC/nvFBC.h>
 #include "wrapper.h"
 
@@ -51,17 +53,6 @@ struct FrameInfo
   uint8_t * diffMap;
 };
 
-typedef struct
-{
-  unsigned int id;
-  bool         greater;
-  unsigned int x;
-  unsigned int y;
-  unsigned int targetX;
-  unsigned int targetY;
-}
-DownsampleRule;
-
 struct iface
 {
   bool        stop;
@@ -101,8 +92,6 @@ struct iface
   struct FrameInfo frameInfo[LGMP_Q_FRAME_LEN];
 };
 
-static Vector downsampleRules = {0};
-
 static struct iface * this = NULL;
 
 static bool nvfbc_deinit(void);
@@ -144,78 +133,11 @@ static const char * nvfbc_getName(void)
   return "NVFBC";
 };
 
-static bool downsampleOptParser(struct Option * opt, const char * str)
-{
-  if (!str)
-    return false;
-
-  opt->value.x_string = strdup(str);
-
-  if (downsampleRules.data)
-    vector_destroy(&downsampleRules);
-
-  if (!vector_create(&downsampleRules, sizeof(DownsampleRule), 10))
-  {
-    DEBUG_ERROR("Failed to allocate ram");
-    return false;
-  }
-
-  char * tmp   = strdup(str);
-  char * token = strtok(tmp, ",");
-  int count = 0;
-  while(token)
-  {
-    DownsampleRule rule = {0};
-    if (token[0] == '>')
-    {
-      rule.greater = true;
-      ++token;
-    }
-
-    if (sscanf(token, "%ux%u:%ux%u",
-      &rule.x,
-      &rule.y,
-      &rule.targetX,
-      &rule.targetY) != 4)
-    {
-      DEBUG_INFO("Unable to parse NvFBC downsample rules");
-      return false;
-    }
-
-    rule.id = count++;
-
-    DEBUG_INFO(
-      "Rule %u: %ux%u IF X %s %4u %s Y %s %4u",
-      rule.id,
-      rule.targetX,
-      rule.targetY,
-      rule.greater ? "> "  : "==",
-      rule.x,
-      rule.greater ? "OR " : "AND",
-      rule.greater ? "> "  : "==",
-      rule.y
-    );
-    vector_push(&downsampleRules, &rule);
-
-    token = strtok(NULL, ",");
-  }
-  free(tmp);
-
-  return true;
-}
-
 static void nvfbc_initOptions(void)
 {
   struct Option options[] =
   {
-    {
-      .module         = "nvfbc",
-      .name           = "downsample", //dxgi:downsample=>1920x1080:1920x1080
-      .description    = "Downsample rules, format: [>](width)x(height):(toWidth)x(toHeight)",
-      .type           = OPTION_TYPE_STRING,
-      .value.x_string = NULL,
-      .parser         = downsampleOptParser
-    },
+    DOWNSAMPLE_PARSER("nvfbc"),
     {
       .module         = "nvfbc",
       .name           = "decoupleCursor",
diff --git a/host/src/downsample_parser.c b/host/src/downsample_parser.c
new file mode 100644
index 00000000..69aa80cd
--- /dev/null
+++ b/host/src/downsample_parser.c
@@ -0,0 +1,86 @@
+/**
+ * looking glass
+ * copyright © 2017-2023 the looking glass authors
+ * https://looking-glass.io
+ *
+ * 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., 59
+ * temple place, suite 330, boston, ma 02111-1307 usa
+ */
+
+#include "downsample_parser.h"
+#include "common/debug.h"
+
+#include <string.h>
+
+Vector downsampleRules = {0};
+
+bool downsampleParser(struct Option * opt, const char * str)
+{
+  if (!str)
+    return false;
+
+  opt->value.x_string = strdup(str);
+
+  if (downsampleRules.data)
+    vector_destroy(&downsampleRules);
+
+  if (!vector_create(&downsampleRules, sizeof(DownsampleRule), 10))
+  {
+    DEBUG_ERROR("Failed to allocate ram");
+    return false;
+  }
+
+  char * tmp   = strdup(str);
+  char * token = strtok(tmp, ",");
+  int count = 0;
+  while(token)
+  {
+    DownsampleRule rule = {0};
+    if (token[0] == '>')
+    {
+      rule.greater = true;
+      ++token;
+    }
+
+    if (sscanf(token, "%ux%u:%ux%u",
+      &rule.x,
+      &rule.y,
+      &rule.targetX,
+      &rule.targetY) != 4)
+    {
+      DEBUG_INFO("Unable to parse downsample rules");
+      return false;
+    }
+
+    rule.id = count++;
+
+    DEBUG_INFO(
+      "Rule %u: %ux%u IF X %s %4u %s Y %s %4u",
+      rule.id,
+      rule.targetX,
+      rule.targetY,
+      rule.greater ? "> "  : "==",
+      rule.x,
+      rule.greater ? "OR " : "AND",
+      rule.greater ? "> "  : "==",
+      rule.y
+    );
+    vector_push(&downsampleRules, &rule);
+
+    token = strtok(NULL, ",");
+  }
+  free(tmp);
+
+  return true;
+}