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diff --git a/src/modules/module-protocol-pulse/message.h b/src/modules/module-protocol-pulse/message.h
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+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef PULSE_SERVER_MESSAGE_H
+#define PULSE_SERVER_MESSAGE_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <spa/utils/list.h>
+#include <spa/support/log.h>
+
+struct impl;
+
+struct message {
+ struct spa_list link;
+ struct impl *impl;
+ uint32_t extra[4];
+ uint32_t channel;
+ uint32_t allocated;
+ uint32_t length;
+ uint32_t offset;
+ uint8_t *data;
+};
+
+enum {
+ TAG_INVALID = 0,
+ TAG_STRING = 't',
+ TAG_STRING_NULL = 'N',
+ TAG_U32 = 'L',
+ TAG_U8 = 'B',
+ TAG_U64 = 'R',
+ TAG_S64 = 'r',
+ TAG_SAMPLE_SPEC = 'a',
+ TAG_ARBITRARY = 'x',
+ TAG_BOOLEAN_TRUE = '1',
+ TAG_BOOLEAN_FALSE = '0',
+ TAG_BOOLEAN = TAG_BOOLEAN_TRUE,
+ TAG_TIMEVAL = 'T',
+ TAG_USEC = 'U' /* 64bit unsigned */,
+ TAG_CHANNEL_MAP = 'm',
+ TAG_CVOLUME = 'v',
+ TAG_PROPLIST = 'P',
+ TAG_VOLUME = 'V',
+ TAG_FORMAT_INFO = 'f',
+};
+
+struct message *message_alloc(struct impl *impl, uint32_t channel, uint32_t size);
+void message_free(struct message *msg, bool dequeue, bool destroy);
+int message_get(struct message *m, ...);
+int message_put(struct message *m, ...);
+int message_dump(enum spa_log_level level, struct message *m);
+
+#endif /* PULSE_SERVER_MESSAGE_H */