core: Add a pa_format_info structure

This will be used to represent the format of data provided by the client
for both compressed and PCM formats in a new extended API.

src/pulse/format.c

@@ -0,0 +1,71 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2011 Intel Corporation
+  Copyright 2011 Collabora Multimedia
+  Copyright 2011 Arun Raghavan <arun.raghavan@collabora.co.uk>
+
+  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 <pulse/internal.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-util.h>
+#include <pulsecore/macro.h>
+
+#include "format.h"
+
+pa_format_info* pa_format_info_new(void) {
+    pa_format_info *f = pa_xnew(pa_format_info, 1);
+
+    f->encoding = PA_ENCODING_INVALID;
+    f->plist = pa_proplist_new();
+
+    return f;
+}
+
+pa_format_info* pa_format_info_copy(const pa_format_info *src) {
+    pa_format_info *dest;
+
+    pa_assert(src);
+
+    dest = pa_xnew(pa_format_info, 1);
+
+    dest->encoding = src->encoding;
+
+    if (src->plist)
+        dest->plist = pa_proplist_copy(src->plist);
+    else
+        dest->plist = NULL;
+
+    return dest;
+}
+
+void pa_format_info_free(pa_format_info *f) {
+    pa_assert(f);
+
+    pa_proplist_free(f->plist);
+    pa_xfree(f);
+}
+
+int pa_format_info_valid(pa_format_info *f) {
+    return (f->encoding >= 0 && f->encoding < PA_ENCODING_MAX && f->plist != NULL);
+}