From 9ed4fac341839a03f69a717353102014f9695e63 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@musicpd.org>
Date: Fri, 31 May 2019 17:45:45 +0200
Subject: [PATCH] input/InputStream: check offset in Rewind()

Don't call Seek() if the stream is already at the beginning.  This
avoids unnecessary exceptions if seeking is not implemented by an
Inputstream implementation.
---
 src/input/InputStream.hxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/input/InputStream.hxx b/src/input/InputStream.hxx
index 82609e14a..3086a21fc 100644
--- a/src/input/InputStream.hxx
+++ b/src/input/InputStream.hxx
@@ -287,11 +287,13 @@ public:
 	 * for Seek(0, error).
 	 */
 	void Rewind(std::unique_lock<Mutex> &lock) {
-		Seek(lock, 0);
+		if (offset > 0)
+			Seek(lock, 0);
 	}
 
 	void LockRewind() {
-		LockSeek(0);
+		std::unique_lock<Mutex> lock(mutex);
+		Rewind(lock);
 	}
 
 	/**