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-rw-r--r--src/encoder/plugins/OggSerial.cxx43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/encoder/plugins/OggSerial.cxx b/src/encoder/plugins/OggSerial.cxx
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+++ b/src/encoder/plugins/OggSerial.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "OggSerial.hxx"
+#include "system/Clock.hxx"
+#include "Compiler.h"
+
+#include <atomic>
+
+static std::atomic_uint next_ogg_serial;
+
+int
+GenerateOggSerial()
+{
+ unsigned serial = ++next_ogg_serial;
+ if (gcc_unlikely(serial < 16)) {
+ /* first-time initialization: seed with a clock value,
+ which is random enough for our use */
+
+ /* this code is not race-free, but good enough */
+ const unsigned seed = MonotonicClockMS();
+ next_ogg_serial = serial = seed;
+ }
+
+ return serial;
+}
+