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a/upmpd/upmpdutils.hxx b/upmpd/upmpdutils.hxx
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extern int percentodbvalue(int value);
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extern int percentodbvalue(int value);
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extern int dbvaluetopercent(int dbvalue);
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extern int dbvaluetopercent(int dbvalue);
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extern bool sleepms(int ms);
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extern bool sleepms(int ms);
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// Format milliseconds into H+:MM:SS
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extern std::string upnpduration(int ms);
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// hms to seconds
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extern int upnpdurationtos(const string& dur);
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// Return mapvalue or null strings, for maps where absent entry and
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// Return mapvalue or null strings, for maps where absent entry and
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// null data are equivalent
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// null data are equivalent
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extern const std::string& mapget(
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extern const std::string& mapget(
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    const std::unordered_map<std::string, std::string>& im, 
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    const std::unordered_map<std::string, std::string>& im, 
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    const std::string& k);
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    const std::string& k);