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diff --git a/stack/avct/avct_defs.h b/stack/avct/avct_defs.h
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+/******************************************************************************
+ *
+ *  Copyright (C) 2003-2012 Broadcom Corporation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+/******************************************************************************
+ *
+ *  This contains constants definitions and other information from the AVCTP
+ *  specification.  This file is intended for use internal to AVCT only.
+ *
+ ******************************************************************************/
+#ifndef AVCT_DEFS_H
+#define AVCT_DEFS_H
+
+/*****************************************************************************
+** constants
+*****************************************************************************/
+
+/* packet type */
+#define AVCT_PKT_TYPE_SINGLE        0       /* single packet */
+#define AVCT_PKT_TYPE_START         1       /* start packet */
+#define AVCT_PKT_TYPE_CONT          2       /* continue packet */
+#define AVCT_PKT_TYPE_END           3       /* end packet */
+
+/* header lengths for different packet types */
+#define AVCT_HDR_LEN_SINGLE         3
+#define AVCT_HDR_LEN_START          4
+#define AVCT_HDR_LEN_CONT           1
+#define AVCT_HDR_LEN_END            1
+
+/* invalid cr+ipid value */
+#define AVCT_CR_IPID_INVALID        1
+
+/*****************************************************************************
+** message parsing and building macros
+*****************************************************************************/
+
+#define AVCT_BLD_HDR(p, label, type, cr_ipid) \
+    *(p)++ = ((label) << 4) | ((type) << 2) | (cr_ipid);
+
+#define AVCT_PRS_HDR(p, label, type, cr_ipid) \
+    label = *(p) >> 4; \
+    type = (*(p) >> 2) & 3; \
+    cr_ipid = *(p)++ & 3;
+
+#define AVCT_PRS_PKT_TYPE(p, type) \
+    type = (*(p) >> 2) & 3;
+
+#endif /* AVCT_DEFS_H */