diff --git a/src/decoder/plugins/MadDecoderPlugin.cxx b/src/decoder/plugins/MadDecoderPlugin.cxx
index fe68810b3..fbf785a7e 100644
--- a/src/decoder/plugins/MadDecoderPlugin.cxx
+++ b/src/decoder/plugins/MadDecoderPlugin.cxx
@@ -23,6 +23,7 @@
 #include "input/InputStream.hxx"
 #include "tag/Id3Scan.hxx"
 #include "tag/Id3ReplayGain.hxx"
+#include "tag/Id3MixRamp.hxx"
 #include "tag/Handler.hxx"
 #include "tag/ReplayGain.hxx"
 #include "tag/MixRampParser.hxx"
@@ -268,35 +269,6 @@ MadDecoder::FillBuffer() noexcept
 	return true;
 }
 
-#ifdef ENABLE_ID3TAG
-gcc_pure
-static MixRampInfo
-parse_id3_mixramp(struct id3_tag *tag) noexcept
-{
-	MixRampInfo result;
-
-	struct id3_frame *frame;
-	for (unsigned i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
-		if (frame->nfields < 3)
-			continue;
-
-		char *const key = (char *)
-		    id3_ucs4_latin1duplicate(id3_field_getstring
-					     (&frame->fields[1]));
-		char *const value = (char *)
-		    id3_ucs4_latin1duplicate(id3_field_getstring
-					     (&frame->fields[2]));
-
-		ParseMixRampTag(result, key, value);
-
-		free(key);
-		free(value);
-	}
-
-	return result;
-}
-#endif
-
 inline void
 MadDecoder::ParseId3(size_t tagsize, Tag *mpd_tag) noexcept
 {
@@ -338,7 +310,7 @@ MadDecoder::ParseId3(size_t tagsize, Tag *mpd_tag) noexcept
 			found_replay_gain = true;
 		}
 
-		client->SubmitMixRamp(parse_id3_mixramp(id3_tag.get()));
+		client->SubmitMixRamp(Id3ToMixRampInfo(id3_tag.get()));
 	}
 
 #else /* !ENABLE_ID3TAG */
diff --git a/src/tag/Id3MixRamp.cxx b/src/tag/Id3MixRamp.cxx
new file mode 100644
index 000000000..0108ad482
--- /dev/null
+++ b/src/tag/Id3MixRamp.cxx
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2003-2021 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 "Id3MixRamp.hxx"
+#include "MixRampParser.hxx"
+#include "MixRampInfo.hxx"
+
+#include <id3tag.h>
+
+#include <stdlib.h>
+
+MixRampInfo
+Id3ToMixRampInfo(const struct id3_tag *tag) noexcept
+{
+	MixRampInfo result;
+
+	struct id3_frame *frame;
+	for (unsigned i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
+		if (frame->nfields < 3)
+			continue;
+
+		char *const key = (char *)
+		    id3_ucs4_latin1duplicate(id3_field_getstring
+					     (&frame->fields[1]));
+		char *const value = (char *)
+		    id3_ucs4_latin1duplicate(id3_field_getstring
+					     (&frame->fields[2]));
+
+		ParseMixRampTag(result, key, value);
+
+		free(key);
+		free(value);
+	}
+
+	return result;
+}
diff --git a/src/tag/Id3MixRamp.hxx b/src/tag/Id3MixRamp.hxx
new file mode 100644
index 000000000..e0e1ce0da
--- /dev/null
+++ b/src/tag/Id3MixRamp.hxx
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2003-2021 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.
+ */
+
+#pragma once
+
+struct id3_tag;
+class MixRampInfo;
+
+[[gnu::pure]]
+MixRampInfo
+Id3ToMixRampInfo(const struct id3_tag *tag) noexcept;
diff --git a/src/tag/meson.build b/src/tag/meson.build
index 0363608b2..b8d06826a 100644
--- a/src/tag/meson.build
+++ b/src/tag/meson.build
@@ -43,6 +43,7 @@ if libid3tag_dep.found()
   tag_sources += [
     'Id3Load.cxx',
     'Id3Scan.cxx',
+    'Id3MixRamp.cxx',
     'Id3ReplayGain.cxx',
     'Rva2.cxx',
     'RiffId3.cxx',