1 files changed, 73 insertions, 0 deletions
diff --git a/src/replay_gain_info.h b/src/replay_gain_info.h
new file mode 100644
index 000000000..f39974d59
--- /dev/null
+++ b/src/replay_gain_info.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+#ifndef MPD_REPLAY_GAIN_INFO_H
+#define MPD_REPLAY_GAIN_INFO_H
+
+#include "check.h"
+
+#include <stdbool.h>
+#include <math.h>
+
+enum replay_gain_mode {
+	REPLAY_GAIN_OFF = -1,
+	REPLAY_GAIN_ALBUM,
+	REPLAY_GAIN_TRACK,
+};
+
+struct replay_gain_tuple {
+	float gain;
+	float peak;
+};
+
+struct replay_gain_info {
+	struct replay_gain_tuple tuples[2];
+};
+
+static inline void
+replay_gain_tuple_init(struct replay_gain_tuple *tuple)
+{
+	tuple->gain = INFINITY;
+	tuple->peak = 0.0;
+}
+
+static inline void
+replay_gain_info_init(struct replay_gain_info *info)
+{
+	replay_gain_tuple_init(&info->tuples[REPLAY_GAIN_ALBUM]);
+	replay_gain_tuple_init(&info->tuples[REPLAY_GAIN_TRACK]);
+}
+
+static inline bool
+replay_gain_tuple_defined(const struct replay_gain_tuple *tuple)
+{
+	return !isinf(tuple->gain);
+}
+
+float
+replay_gain_tuple_scale(const struct replay_gain_tuple *tuple, float preamp);
+
+/**
+ * Attempt to auto-complete missing data.  In particular, if album
+ * information is missing, track gain is used.
+ */
+void
+replay_gain_info_complete(struct replay_gain_info *info);
+
+#endif