diff --git a/examples.mk b/examples.mk
index 2cee298..16f3c8f 100644
--- a/examples.mk
+++ b/examples.mk
@@ -41,6 +41,7 @@
 vpxenc.SRCS                 += vpx_ports/mem_ops.h
 vpxenc.SRCS                 += vpx_ports/mem_ops_aligned.h
 vpxenc.SRCS                 += vpx_ports/vpx_timer.h
+vpxenc.SRCS                 += vpxstats.c vpxstats.h
 vpxenc.SRCS                 += third_party/libmkv/EbmlIDs.h
 vpxenc.SRCS                 += third_party/libmkv/EbmlWriter.c
 vpxenc.SRCS                 += third_party/libmkv/EbmlWriter.h
diff --git a/vpxenc.c b/vpxenc.c
index f0f0df3..b7897db 100644
--- a/vpxenc.c
+++ b/vpxenc.c
@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "vpx_config.h"
+#include "./vpx_config.h"
 
 #if defined(_WIN32) || defined(__OS2__) || !CONFIG_OS_SUPPORT
 #define USE_POSIX_MMAP 0
@@ -16,6 +16,7 @@
 #define USE_POSIX_MMAP 1
 #endif
 
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -43,11 +44,12 @@
 #include "vpx/vp8dx.h"
 #endif
 
+#include "./tools_common.h"
 #include "vpx_ports/mem_ops.h"
 #include "vpx_ports/vpx_timer.h"
-#include "tools_common.h"
-#include "webmenc.h"
-#include "y4minput.h"
+#include "./vpxstats.h"
+#include "./webmenc.h"
+#include "./y4minput.h"
 
 /* Swallow warnings about unused results of fread/fwrite */
 static size_t wrap_fread(void *ptr, size_t size, size_t nmemb,
@@ -116,126 +118,6 @@
   va_end(ap);
 }
 
-/* This structure is used to abstract the different ways of handling
- * first pass statistics.
- */
-typedef struct {
-  vpx_fixed_buf_t buf;
-  int             pass;
-  FILE           *file;
-  char           *buf_ptr;
-  size_t          buf_alloc_sz;
-} stats_io_t;
-
-int stats_open_file(stats_io_t *stats, const char *fpf, int pass) {
-  int res;
-
-  stats->pass = pass;
-
-  if (pass == 0) {
-    stats->file = fopen(fpf, "wb");
-    stats->buf.sz = 0;
-    stats->buf.buf = NULL,
-               res = (stats->file != NULL);
-  } else {
-#if 0
-#elif USE_POSIX_MMAP
-    struct stat stat_buf;
-    int fd;
-
-    fd = open(fpf, O_RDONLY);
-    stats->file = fdopen(fd, "rb");
-    fstat(fd, &stat_buf);
-    stats->buf.sz = stat_buf.st_size;
-    stats->buf.buf = mmap(NULL, stats->buf.sz, PROT_READ, MAP_PRIVATE,
-                          fd, 0);
-    res = (stats->buf.buf != NULL);
-#else
-    size_t nbytes;
-
-    stats->file = fopen(fpf, "rb");
-
-    if (fseek(stats->file, 0, SEEK_END))
-      fatal("First-pass stats file must be seekable!");
-
-    stats->buf.sz = stats->buf_alloc_sz = ftell(stats->file);
-    rewind(stats->file);
-
-    stats->buf.buf = malloc(stats->buf_alloc_sz);
-
-    if (!stats->buf.buf)
-      fatal("Failed to allocate first-pass stats buffer (%lu bytes)",
-            (unsigned long)stats->buf_alloc_sz);
-
-    nbytes = fread(stats->buf.buf, 1, stats->buf.sz, stats->file);
-    res = (nbytes == stats->buf.sz);
-#endif
-  }
-
-  return res;
-}
-
-int stats_open_mem(stats_io_t *stats, int pass) {
-  int res;
-  stats->pass = pass;
-
-  if (!pass) {
-    stats->buf.sz = 0;
-    stats->buf_alloc_sz = 64 * 1024;
-    stats->buf.buf = malloc(stats->buf_alloc_sz);
-  }
-
-  stats->buf_ptr = stats->buf.buf;
-  res = (stats->buf.buf != NULL);
-  return res;
-}
-
-
-void stats_close(stats_io_t *stats, int last_pass) {
-  if (stats->file) {
-    if (stats->pass == last_pass) {
-#if 0
-#elif USE_POSIX_MMAP
-      munmap(stats->buf.buf, stats->buf.sz);
-#else
-      free(stats->buf.buf);
-#endif
-    }
-
-    fclose(stats->file);
-    stats->file = NULL;
-  } else {
-    if (stats->pass == last_pass)
-      free(stats->buf.buf);
-  }
-}
-
-void stats_write(stats_io_t *stats, const void *pkt, size_t len) {
-  if (stats->file) {
-    (void) fwrite(pkt, 1, len, stats->file);
-  } else {
-    if (stats->buf.sz + len > stats->buf_alloc_sz) {
-      size_t  new_sz = stats->buf_alloc_sz + 64 * 1024;
-      char   *new_ptr = realloc(stats->buf.buf, new_sz);
-
-      if (new_ptr) {
-        stats->buf_ptr = new_ptr + (stats->buf_ptr - (char *)stats->buf.buf);
-        stats->buf.buf = new_ptr;
-        stats->buf_alloc_sz = new_sz;
-      } else
-        fatal("Failed to realloc firstpass stats buffer.");
-    }
-
-    memcpy(stats->buf_ptr, pkt, len);
-    stats->buf.sz += len;
-    stats->buf_ptr += len;
-  }
-}
-
-vpx_fixed_buf_t stats_get(stats_io_t *stats) {
-  return stats->buf;
-}
-
 enum video_file_type {
   FILE_TYPE_RAW,
   FILE_TYPE_IVF,
@@ -263,7 +145,6 @@
   int                   only_i420;
 };
 
-
 #define IVF_FRAME_HDR_SZ (4+8) /* 4 byte size + 8 byte timestamp */
 static int read_frame(struct input_state *input, vpx_image_t *img) {
   FILE *f = input->file;
@@ -478,22 +359,6 @@
   return h;
 }
 
-#include "math.h"
-#define MAX_PSNR 100
-static double vp8_mse2psnr(double Samples, double Peak, double Mse) {
-  double psnr;
-
-  if ((double)Mse > 0.0)
-    psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
-  else
-    psnr = MAX_PSNR;      /* Limit to prevent / 0 */
-
-  if (psnr > MAX_PSNR)
-    psnr = MAX_PSNR;
-
-  return psnr;
-}
-
 
 #include "args.h"
 static const arg_def_t debugmode = ARG_DEF("D", "debug", 0,
diff --git a/vpxstats.c b/vpxstats.c
new file mode 100644
index 0000000..70cea3e
--- /dev/null
+++ b/vpxstats.c
@@ -0,0 +1,135 @@
+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "./vpxstats.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "./tools_common.h"
+
+int stats_open_file(stats_io_t *stats, const char *fpf, int pass) {
+  int res;
+  stats->pass = pass;
+
+  if (pass == 0) {
+    stats->file = fopen(fpf, "wb");
+    stats->buf.sz = 0;
+    stats->buf.buf = NULL;
+    res = (stats->file != NULL);
+  } else {
+#if USE_POSIX_MMAP
+    struct stat stat_buf;
+    int fd;
+
+    fd = open(fpf, O_RDONLY);
+    stats->file = fdopen(fd, "rb");
+    fstat(fd, &stat_buf);
+    stats->buf.sz = stat_buf.st_size;
+    stats->buf.buf = mmap(NULL, stats->buf.sz, PROT_READ, MAP_PRIVATE, fd, 0);
+    res = (stats->buf.buf != NULL);
+#else
+    size_t nbytes;
+
+    stats->file = fopen(fpf, "rb");
+
+    if (fseek(stats->file, 0, SEEK_END))
+      fatal("First-pass stats file must be seekable!");
+
+    stats->buf.sz = stats->buf_alloc_sz = ftell(stats->file);
+    rewind(stats->file);
+
+    stats->buf.buf = malloc(stats->buf_alloc_sz);
+
+    if (!stats->buf.buf)
+      fatal("Failed to allocate first-pass stats buffer (%lu bytes)",
+            (unsigned int)stats->buf_alloc_sz);
+
+    nbytes = fread(stats->buf.buf, 1, stats->buf.sz, stats->file);
+    res = (nbytes == stats->buf.sz);
+#endif  /* USE_POSIX_MMAP */
+  }
+
+  return res;
+}
+
+int stats_open_mem(stats_io_t *stats, int pass) {
+  int res;
+  stats->pass = pass;
+
+  if (!pass) {
+    stats->buf.sz = 0;
+    stats->buf_alloc_sz = 64 * 1024;
+    stats->buf.buf = malloc(stats->buf_alloc_sz);
+  }
+
+  stats->buf_ptr = stats->buf.buf;
+  res = (stats->buf.buf != NULL);
+  return res;
+}
+
+void stats_close(stats_io_t *stats, int last_pass) {
+  if (stats->file) {
+    if (stats->pass == last_pass) {
+#if USE_POSIX_MMAP
+      munmap(stats->buf.buf, stats->buf.sz);
+#else
+      free(stats->buf.buf);
+#endif  /* USE_POSIX_MMAP */
+    }
+
+    fclose(stats->file);
+    stats->file = NULL;
+  } else {
+    if (stats->pass == last_pass)
+      free(stats->buf.buf);
+  }
+}
+
+void stats_write(stats_io_t *stats, const void *pkt, size_t len) {
+  if (stats->file) {
+    (void) fwrite(pkt, 1, len, stats->file);
+  } else {
+    if (stats->buf.sz + len > stats->buf_alloc_sz) {
+      size_t  new_sz = stats->buf_alloc_sz + 64 * 1024;
+      char   *new_ptr = realloc(stats->buf.buf, new_sz);
+
+      if (new_ptr) {
+        stats->buf_ptr = new_ptr + (stats->buf_ptr - (char *)stats->buf.buf);
+        stats->buf.buf = new_ptr;
+        stats->buf_alloc_sz = new_sz;
+      } else {
+        fatal("Failed to realloc firstpass stats buffer.");
+      }
+    }
+
+    memcpy(stats->buf_ptr, pkt, len);
+    stats->buf.sz += len;
+    stats->buf_ptr += len;
+  }
+}
+
+vpx_fixed_buf_t stats_get(stats_io_t *stats) {
+  return stats->buf;
+}
+
+double vp8_mse2psnr(double samples, double peak, double mse) {
+  const int kMaxPSNR = 100;
+  double psnr = kMaxPSNR;
+
+  if (mse > 0.0)
+    psnr = 10.0 * log10(peak * peak * samples / mse);
+
+  if (psnr > kMaxPSNR)
+    psnr = kMaxPSNR;
+
+  return psnr;
+}
diff --git a/vpxstats.h b/vpxstats.h
new file mode 100644
index 0000000..18b3acd
--- /dev/null
+++ b/vpxstats.h
@@ -0,0 +1,37 @@
+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VPXSTATS_H_
+#define VPXSTATS_H_
+
+#include <stdio.h>
+
+#include "vpx/vpx_encoder.h"
+
+/* This structure is used to abstract the different ways of handling
+ * first pass statistics
+ */
+typedef struct {
+  vpx_fixed_buf_t buf;
+  int pass;
+  FILE *file;
+  char *buf_ptr;
+  size_t buf_alloc_sz;
+} stats_io_t;
+
+int stats_open_file(stats_io_t *stats, const char *fpf, int pass);
+int stats_open_mem(stats_io_t *stats, int pass);
+void stats_close(stats_io_t *stats, int last_pass);
+void stats_write(stats_io_t *stats, const void *pkt, size_t len);
+vpx_fixed_buf_t stats_get(stats_io_t *stats);
+
+double vp8_mse2psnr(double samples, double peak, double mse);
+
+#endif  // VPXSTATS_H_