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diff --git a/include/share/replaygain_synthesis.h b/include/share/replaygain_synthesis.h
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+++ b/include/share/replaygain_synthesis.h
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+/* replaygain_synthesis - Routines for applying ReplayGain to a signal
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
+#define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
+
+#include <stdlib.h> /* for size_t */
+#include "FLAC/format.h"
+
+#define FLAC_SHARE__MAX_SUPPORTED_CHANNELS FLAC__MAX_CHANNELS
+
+typedef enum {
+	NOISE_SHAPING_NONE = 0,
+	NOISE_SHAPING_LOW = 1,
+	NOISE_SHAPING_MEDIUM = 2,
+	NOISE_SHAPING_HIGH = 3
+} NoiseShaping;
+
+typedef struct {
+	const float*  FilterCoeff;
+	FLAC__uint64  Mask;
+	double        Add;
+	float         Dither;
+	float         ErrorHistory     [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];  /* 16th order Noise shaping */
+	float         DitherHistory    [FLAC_SHARE__MAX_SUPPORTED_CHANNELS] [16];
+	int           LastRandomNumber [FLAC_SHARE__MAX_SUPPORTED_CHANNELS];
+	unsigned      LastHistoryIndex;
+	NoiseShaping  ShapingType;
+} DitherContext;
+
+void FLAC__replaygain_synthesis__init_dither_context(DitherContext *dither, int bits, int shapingtype);
+
+/* scale = (float) pow(10., (double)replaygain * 0.05); */
+size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32 * const input[], uint32_t wide_samples, uint32_t channels, const uint32_t source_bps, const uint32_t target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context);
+
+#endif