decoder/mad: move parse_id3_mixramp() to tag/Id3MixRamp.cxx

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;
+}

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;

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',