Turn device ports into reference counted objects

Since both cards and sinks can hold references to a port, it makes
sense to reference count them. Although no current implementation
actually has sinks with ports but without a card, it felt wrong
to make it harder to make such an implementation in the future.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>

src/pulsecore/device-port.h

@@ -0,0 +1,61 @@
+#ifndef foopulsedeviceporthfoo
+#define foopulsedeviceporthfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+  Copyright 2011 David Henningsson, Canonical Ltd.
+
+  PulseAudio 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.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <inttypes.h>
+
+#include <pulse/def.h>
+#include <pulsecore/object.h>
+#include <pulsecore/hashmap.h>
+
+typedef struct pa_device_port pa_device_port;
+
+struct pa_device_port {
+    pa_object parent; /* Needed for reference counting */
+
+    char *name;
+    char *description;
+
+    unsigned priority;
+    pa_port_available_t available;         /* PA_PORT_AVAILABLE_UNKNOWN, PA_PORT_AVAILABLE_NO or PA_PORT_AVAILABLE_YES */
+
+    /* .. followed by some implementation specific data */
+};
+
+PA_DECLARE_PUBLIC_CLASS(pa_device_port);
+#define PA_DEVICE_PORT(s) (pa_device_port_cast(s))
+
+#define PA_DEVICE_PORT_DATA(d) ((void*) ((uint8_t*) d + PA_ALIGN(sizeof(pa_device_port))))
+
+pa_device_port *pa_device_port_new(const char *name, const char *description, size_t extra);
+
+void pa_device_port_hashmap_free(pa_hashmap *h);
+
+#endif