Index: uspace/lib/hound/include/hound/protocol.h
===================================================================
--- uspace/lib/hound/include/hound/protocol.h	(revision 71780e099bd3d9cff0aed6ff0b00641b120373a8)
+++ uspace/lib/hound/include/hound/protocol.h	(revision 71780e099bd3d9cff0aed6ff0b00641b120373a8)
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2013 Jan Vesely
+ * All rights reserved.
+ *
+ * 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+/** @addtogroup libhound
+ * @addtogroup audio
+ * @{
+ */
+/** @file
+ * @brief Audio PCM buffer interface.
+ */
+
+#ifndef LIBHOUND_PROTOCOL_H_
+#define LIBHOUND_PROTOCOL_H_
+
+#include <async.h>
+#include <pcm/format.h>
+
+const char *HOUND_SERVICE;
+
+typedef async_sess_t hound_sess_t;
+typedef int hound_context_id_t;
+
+hound_sess_t *hound_service_connect(const char *service);
+void hound_service_disconnect(hound_sess_t *sess);
+
+hound_context_id_t hound_service_register_context(hound_sess_t *sess,
+    const char *name, bool record);
+int hound_service_unregister_context(hound_sess_t *sess, hound_context_id_t id);
+
+int hound_service_stream_enter(async_exch_t *exch, hound_context_id_t id,
+    int flags, pcm_format_t format, size_t bsize);
+int hound_service_stream_drain(async_exch_t *exch);
+int hound_service_stream_exit(async_exch_t *exch);
+
+int hound_service_stream_write(async_exch_t *exch, const void *data, size_t size);
+int hound_service_stream_read(async_exch_t *exch, void *data, size_t size);
+
+/* Server */
+typedef struct hound_server_iface {
+	int (*add_context)(void *, hound_context_id_t *, const char *, bool);
+	int (*rem_context)(void *, hound_context_id_t);
+	int (*add_stream)(void *, hound_context_id_t, int, pcm_format_t, size_t,
+	    void **);
+	int (*rem_stream)(void *, void *);
+	int (*stream_data_write)(void *, const void *, size_t);
+	int (*stream_data_read)(void *, void *, size_t);
+	void *server;
+} hound_server_iface_t;
+
+void hound_service_set_server_iface(hound_server_iface_t *iface);
+
+void hound_connection_handler(ipc_callid_t iid, ipc_call_t *icall, void *arg);
+
+#endif
+/** @}
+ */
Index: uspace/lib/hound/include/hound/server.h
===================================================================
--- uspace/lib/hound/include/hound/server.h	(revision 9e1800cd0d11714b8a9dd6d7e56a5e435315d57d)
+++ uspace/lib/hound/include/hound/server.h	(revision 71780e099bd3d9cff0aed6ff0b00641b120373a8)
@@ -40,5 +40,7 @@
 #include <stdbool.h>
 #include <loc.h>
-#include <pcm/sample_format.h>
+#include <pcm/format.h>
+
+
 
 enum {