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diff --git a/libmatemixer/matemixer-backend.h b/libmatemixer/matemixer-backend.h
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+++ b/libmatemixer/matemixer-backend.h
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+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library 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 of the licence, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MATEMIXER_BACKEND_H
+#define MATEMIXER_BACKEND_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include <libmatemixer/matemixer-enums.h>
+
+G_BEGIN_DECLS
+
+#define MATE_MIXER_TYPE_BACKEND \
+ (mate_mixer_backend_get_type ())
+#define MATE_MIXER_BACKEND(o) \
+ (G_TYPE_CHECK_INSTANCE_CAST ((o), MATE_MIXER_TYPE_BACKEND, MateMixerBackend))
+#define MATE_MIXER_IS_BACKEND(o) \
+ (G_TYPE_CHECK_INSTANCE_TYPE ((o), MATE_MIXER_TYPE_BACKEND))
+#define MATE_MIXER_BACKEND_GET_INTERFACE(o) \
+ (G_TYPE_INSTANCE_GET_INTERFACE ((o), MATE_MIXER_TYPE_BACKEND, MateMixerBackendInterface))
+
+typedef struct _MateMixerBackend MateMixerBackend; /* dummy object */
+typedef struct _MateMixerBackendInterface MateMixerBackendInterface;
+
+struct _MateMixerBackendInterface
+{
+ GTypeInterface parent;
+
+ gboolean (*open) (MateMixerBackend *backend);
+ void (*close) (MateMixerBackend *backend);
+ const GList *(*list_devices) (MateMixerBackend *backend);
+ const GList *(*list_tracks) (MateMixerBackend *backend);
+};
+
+GType mate_mixer_backend_get_type (void) G_GNUC_CONST;
+
+gboolean mate_mixer_backend_open (MateMixerBackend *backend);
+void mate_mixer_backend_close (MateMixerBackend *backend);
+const GList *mate_mixer_backend_list_devices (MateMixerBackend *backend);
+const GList *mate_mixer_backend_list_tracks (MateMixerBackend *backend);
+
+G_END_DECLS
+
+#endif /* MATEMIXER_BACKEND_H */