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-rw-r--r--media/libvpx/libvpx/vpx_util/vpx_timestamp.h49
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
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+++ 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_