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+/*
+ This file is part of Ingen.
+ Copyright 2007-2012 David Robillard <http://drobilla.net/>
+
+ Ingen is free software: you can redistribute it and/or modify it under the
+ terms of the GNU Affero General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or any later version.
+
+ Ingen 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 Affero General Public License for details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with Ingen. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_ARC_IMPL_HPP
+#define INGEN_ENGINE_ARC_IMPL_HPP
+
+#include <cstdlib>
+
+#include <boost/intrusive/slist.hpp>
+#include <boost/utility.hpp>
+
+#include "ingen/Arc.hpp"
+#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
+#include "raul/Deletable.hpp"
+
+#include "BufferRef.hpp"
+#include "Context.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class PortImpl;
+class OutputPort;
+class InputPort;
+
+/** Represents a single inbound connection for an InputPort.
+ *
+ * This can be a group of ports (coming from a polyphonic Block) or
+ * a single Port. This class exists basically as an abstraction of mixing
+ * down polyphonic inputs, so InputPort can just deal with mixing down
+ * multiple connections (oblivious to the polyphonic situation of the
+ * connection itself).
+ *
+ * This is stored in an intrusive slist in InputPort.
+ *
+ * \ingroup engine
+ */
+class ArcImpl
+ : private Raul::Noncopyable
+ , public Arc
+ , public boost::intrusive::slist_base_hook<
+ boost::intrusive::link_mode<boost::intrusive::auto_unlink> >
+{
+public:
+ ArcImpl(PortImpl* tail, PortImpl* head);
+
+ inline PortImpl* tail() const { return _tail; }
+ inline PortImpl* head() const { return _head; }
+
+ const Raul::Path& tail_path() const;
+ const Raul::Path& head_path() const;
+
+ /** Get the buffer for a particular voice.
+ * An Arc is smart - it knows the destination port requesting the
+ * buffer, and will return accordingly (e.g. the same buffer for every
+ * voice in a mono->poly arc).
+ */
+ BufferRef buffer(uint32_t voice) const;
+
+ /** Whether this arc must mix down voices into a local buffer */
+ bool must_mix() const;
+
+ static bool can_connect(const OutputPort* src, const InputPort* dst);
+
+protected:
+ PortImpl* const _tail;
+ PortImpl* const _head;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_ARC_IMPL_HPP