decoder/sidplay: implemented songlength database

[mk: added autoconf test; fixed songlen_data_size type]

doc/mpdconf.example

@@ -363,3 +363,25 @@ input {
 #id3v1_encoding			"ISO-8859-1"
 #
 ###############################################################################
+
+
+# SIDPlay decoder #############################################################
+#
+# songlength_database:
+#  Location of your songlengths file, as distributed with the HVSC.
+#  The sidplay plugin checks this for matching MD5 fingerprints.
+#  See http://www.c64.org/HVSC/DOCUMENTS/Songlengths.faq
+#
+# default_songlength:
+#  This is the default playing time in seconds for songs not in the
+#  songlength database, or in case you're not using a database.
+#  A value of 0 means play indefinitely.
+#
+#decoder {
+#	plugin			"sidplay"
+#	songlength_database	"/media/C64Music/DOCUMENTS/Songlengths.txt"
+#	default_songlength	"120"
+#}
+#
+###############################################################################
+