From d3d1d37782952e9b1142a4735635aac3dd2db466 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@musicpd.org>
Date: Fri, 21 Sep 2018 19:32:35 +0200
Subject: AudioFormat: add TimeToSize(), SizeToTime()

---
 src/AudioFormat.hxx | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/AudioFormat.hxx')

diff --git a/src/AudioFormat.hxx b/src/AudioFormat.hxx
index 8b0ffb557..8c9cda3e3 100644
--- a/src/AudioFormat.hxx
+++ b/src/AudioFormat.hxx
@@ -23,6 +23,8 @@
 #include "pcm/SampleFormat.hxx"
 #include "util/Compiler.h"
 
+#include <chrono>
+
 #include <stdint.h>
 #include <stddef.h>
 
@@ -152,6 +154,28 @@ struct AudioFormat {
 	 * span to a storage size in bytes.
 	 */
 	double GetTimeToSize() const;
+
+	template<typename D>
+	constexpr auto TimeToFrames(D t) const noexcept {
+		using Period = typename D::period;
+		return ((t.count() * sample_rate) / Period::den) * Period::num;
+	}
+
+	template<typename D>
+	constexpr size_t TimeToSize(D t) const noexcept {
+		return size_t(size_t(TimeToFrames(t)) * GetFrameSize());
+	}
+
+	template<typename D>
+	constexpr D FramesToTime(std::uintmax_t size) const noexcept {
+		using Period = typename D::period;
+		return D(((size / Period::num) * Period::den) / sample_rate);
+	}
+
+	template<typename D>
+	constexpr D SizeToTime(std::uintmax_t size) const noexcept {
+		return FramesToTime<D>(size / GetFrameSize());
+	}
 };
 
 /**
-- 
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