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diff --git a/sideband/internal/include/pt_sb_decoder.h b/sideband/internal/include/pt_sb_decoder.h
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+/*
+ * Copyright (c) 2017-2019, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef PT_SB_DECODER_H
+#define PT_SB_DECODER_H
+
+#include <stdio.h>
+
+
+/* An Intel PT sideband decoder. */
+struct pt_sb_decoder {
+	/* The next Intel PT sideband decoder in a linear list of Intel PT
+	 * sideband decoders ordered by @tsc (ascending).
+	 */
+	struct pt_sb_decoder *next;
+
+	/* The timestamp of the next sideband record. */
+	uint64_t tsc;
+
+	/* Decoder functions provided by the decoder supplier:
+	 *
+	 * - fetch the next sideband record.
+	 */
+	int (*fetch)(struct pt_sb_session *session, uint64_t *tsc, void *priv);
+
+	/* - apply the current sideband record. */
+	int (*apply)(struct pt_sb_session *session, struct pt_image **image,
+		     const struct pt_event *event, void *priv);
+
+	/* - print the current sideband record. */
+	int (*print)(struct pt_sb_session *session, FILE *stream,
+		     uint32_t flags, void *priv);
+
+	/* - destroy the decoder's private data. */
+	void (*dtor)(void *priv);
+
+	/* Decoder-specific private data. */
+	void *priv;
+
+	/* A flag saying whether this is a primary or secondary decoder. */
+	uint32_t primary:1;
+};
+
+#endif /* PT_SB_DECODER_H */