1 files changed, 49 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_util/vpx_timestamp.h b/media/libvpx/libvpx/vpx_util/vpx_timestamp.h
new file mode 100644
index 0000000000..5296458fad
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_util/vpx_timestamp.h
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2019 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 VPX_VPX_UTIL_VPX_TIMESTAMP_H_
+#define VPX_VPX_UTIL_VPX_TIMESTAMP_H_
+
+#include <assert.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// Rational Number with an int64 numerator
+typedef struct vpx_rational64 {
+  int64_t num;       // fraction numerator
+  int den;           // fraction denominator
+} vpx_rational64_t;  // alias for struct vpx_rational64_t
+
+static INLINE int gcd(int64_t a, int b) {
+  int r;  // remainder
+  assert(a >= 0);
+  assert(b > 0);
+  while (b != 0) {
+    r = (int)(a % b);
+    a = b;
+    b = r;
+  }
+
+  return (int)a;
+}
+
+static INLINE void reduce_ratio(vpx_rational64_t *ratio) {
+  const int denom = gcd(ratio->num, ratio->den);
+  ratio->num /= denom;
+  ratio->den /= denom;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // VPX_VPX_UTIL_VPX_TIMESTAMP_H_