From 26c2ba50ac08f1dea90b414cbf7ac7df1cf085c1 Mon Sep 17 00:00:00 2001
From: whentze <muvlon@hentzes.de>
Date: Wed, 15 May 2019 03:12:47 +0200
Subject: [PATCH] Add a correct implementation of `total_duration` to
 `FlacDecoder`.

---
 src/decoder/flac.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/decoder/flac.rs b/src/decoder/flac.rs
index 3ca2291..01111c3 100644
--- a/src/decoder/flac.rs
+++ b/src/decoder/flac.rs
@@ -18,6 +18,7 @@ where
     bits_per_sample: u32,
     sample_rate: u32,
     channels: u16,
+    samples: Option<u64>,
 }
 
 impl<R> FlacDecoder<R>
@@ -43,6 +44,7 @@ where
             bits_per_sample: spec.bits_per_sample,
             sample_rate: spec.sample_rate,
             channels: spec.channels as u16,
+            samples: spec.samples,
         })
     }
 }
@@ -68,7 +70,9 @@ where
 
     #[inline]
     fn total_duration(&self) -> Option<Duration> {
-        None
+        // `samples` in FLAC means "inter-channel samples" aka frames
+        // so we do not divide by `self.channels` here.
+        self.samples.map(|s| Duration::from_micros(s * 1_000_000 / self.sample_rate as u64))
     }
 }