diff options
Diffstat (limited to 'libvpx/vpx_util/vpx_timestamp.h')
-rw-r--r-- | libvpx/vpx_util/vpx_timestamp.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/libvpx/vpx_util/vpx_timestamp.h b/libvpx/vpx_util/vpx_timestamp.h new file mode 100644 index 000000000..c210de5e5 --- /dev/null +++ b/libvpx/vpx_util/vpx_timestamp.h @@ -0,0 +1,45 @@ +/* + * 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_ + +#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 + 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_ |