1 files changed, 86 insertions, 0 deletions

diff --git a/src/tag/ReplayGain.cxx b/src/tag/ReplayGain.cxx
new file mode 100644
index 000000000..83a48f243
--- /dev/null
+++ b/src/tag/ReplayGain.cxx
@@ -0,0 +1,86 @@
+/*
+ * 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 "config.h"
+#include "ReplayGain.hxx"
+#include "VorbisComment.hxx"
+#include "ReplayGainInfo.hxx"
+#include "util/ASCII.hxx"
+
+#include <assert.h>
+#include <stdlib.h>
+
+template<typename T>
+static bool
+ParseReplayGainTagTemplate(ReplayGainInfo &info, const T t)
+{
+	const char *value;
+
+	if ((value = t["replaygain_track_gain"]) != nullptr) {
+		info.tuples[REPLAY_GAIN_TRACK].gain = atof(value);
+		return true;
+	} else if ((value = t["replaygain_album_gain"]) != nullptr) {
+		info.tuples[REPLAY_GAIN_ALBUM].gain = atof(value);
+		return true;
+	} else if ((value = t["replaygain_track_peak"]) != nullptr) {
+		info.tuples[REPLAY_GAIN_TRACK].peak = atof(value);
+		return true;
+	} else if ((value = t["replaygain_album_peak"]) != nullptr) {
+		info.tuples[REPLAY_GAIN_ALBUM].peak = atof(value);
+		return true;
+	} else
+		return false;
+
+}
+
+bool
+ParseReplayGainTag(ReplayGainInfo &info, const char *name, const char *value)
+{
+	assert(name != nullptr);
+	assert(value != nullptr);
+
+	struct NameValue {
+		const char *name;
+		const char *value;
+
+		gcc_pure
+		const char *operator[](const char *n) const {
+			return StringEqualsCaseASCII(name, n)
+				? value
+				: nullptr;
+		}
+	};
+
+	return ParseReplayGainTagTemplate(info, NameValue{name, value});
+}
+
+bool
+ParseReplayGainVorbis(ReplayGainInfo &info, const char *entry)
+{
+	struct VorbisCommentEntry {
+		const char *entry;
+
+		gcc_pure
+		const char *operator[](const char *n) const {
+			return vorbis_comment_value(entry, n);
+		}
+	};
+
+	return ParseReplayGainTagTemplate(info, VorbisCommentEntry{entry});
+}