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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David Robillard <http://drobilla.net>
+ *
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) 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 General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef INGEN_ENGINE_CONNECTIONIMPL_HPP
+#define INGEN_ENGINE_CONNECTIONIMPL_HPP
+
+#include <cstdlib>
+#include <boost/utility.hpp>
+#include "raul/log.hpp"
+#include "raul/Deletable.hpp"
+#include "raul/IntrusivePtr.hpp"
+#include "ingen/PortType.hpp"
+#include "ingen/Connection.hpp"
+#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
+#include "PortImpl.hpp"
+
+using namespace std;
+
+namespace Ingen {
+namespace Server {
+
+class PortImpl;
+class OutputPort;
+class InputPort;
+class Buffer;
+class BufferFactory;
+
+/** Represents a single inbound connection for an InputPort.
+ *
+ * This can be a group of ports (ie coming from a polyphonic Node) 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).
+ *
+ * \ingroup engine
+ */
+class ConnectionImpl : public Raul::Deletable, public Connection
+{
+public:
+ ConnectionImpl(BufferFactory& bufs, PortImpl* src_port, PortImpl* dst_port);
+
+ PortImpl* src_port() const { return _src_port; }
+ PortImpl* dst_port() const { return _dst_port; }
+
+ const Raul::Path src_port_path() const { return _src_port->path(); }
+ const Raul::Path dst_port_path() const { return _dst_port->path(); }
+
+ /** Used by some (recursive) events to prevent double disconnections */
+ bool pending_disconnection() { return _pending_disconnection; }
+ void pending_disconnection(bool b) { _pending_disconnection = b; }
+
+ void queue(Context& context);
+
+ void get_sources(Context& context, uint32_t voice,
+ IntrusivePtr<Buffer>* srcs, uint32_t max_num_srcs, uint32_t& num_srcs);
+
+ /** Get the buffer for a particular voice.
+ * A Connection 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 connection).
+ */
+ inline BufferFactory::Ref buffer(uint32_t voice) const {
+ assert(!must_mix());
+ assert(!must_queue());
+ assert(_src_port->poly() == 1 || _src_port->poly() > voice);
+ if (_src_port->poly() == 1) {
+ return _src_port->buffer(0);
+ } else {
+ return _src_port->buffer(voice);
+ }
+ }
+
+ /** Returns true if this connection must mix down voices into a local buffer */
+ inline bool must_mix() const { return _src_port->poly() > _dst_port->poly(); }
+
+ /** Returns true if this connection crosses contexts and must buffer */
+ inline bool must_queue() const { return _src_port->context() != _dst_port->context(); }
+
+ static bool can_connect(const OutputPort* src, const InputPort* dst);
+
+protected:
+ void dump() const;
+
+ Raul::RingBuffer* _queue;
+
+ BufferFactory& _bufs;
+ PortImpl* const _src_port;
+ PortImpl* const _dst_port;
+ bool _pending_disconnection;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_CONNECTIONIMPL_HPP