Ichthyostega
685a9b84ee
Benefits - get rid of yet another pervasive Boost dependency - define additional more fine grained policies (move only, clonable)
123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
/*
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OutputSlot - capability to transfer data to a physical output
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file output-slot.cpp
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** Generic implementation functionality common to all output connections.
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*/
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#include "lib/error.hpp"
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#include "proc/play/output-slot.hpp"
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#include "proc/play/output-slot-connection.hpp"
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#include <vector>
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namespace proc {
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namespace play {
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using std::vector;
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namespace error = lumiera::error;
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OutputSlot::~OutputSlot() { } // emit VTables here....
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OutputSlot::Allocation::~Allocation() { }
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OutputSlot::Connection::~Connection() { }
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/** whether this output slot is occupied
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* @return true if currently unconnected and
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* able to connect and handle output data
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*/
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bool
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OutputSlot::isFree() const
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{
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return not this->state_;
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}
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/** claim this OutputSlot for active use as output sink(s).
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* At any point, a given slot can only be used for a single
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* ongoing output process (which may serve several channels though).
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* The assumption is for the OutputSlot to be picked through a query
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* to some OutputManater, so the parameters (resolution, sample rate...)
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* should be suited for the intended use. Thus no additional configuration
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* is necessary.
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* @return Allocation representing the "connected state" from the client's POV.
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* The client may retrieve the effectively required Timings from there,
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* as well as the actual output sinks, ready for use.
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* @remarks calls back into #buildState, where the concrete OutputSlot
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* is expected to provide a private Connection implementation,
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* subclassing OutputSlot::Allocation
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*/
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OutputSlot::Allocation&
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OutputSlot::allocate()
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{
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if (not isFree())
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throw error::Logic ("Attempt to open/allocate an OutputSlot already in use.");
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state_.reset (this->buildState());
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return *state_;
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}
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void
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OutputSlot::disconnect()
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{
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if (not isFree())
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state_.reset(0);
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}
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/* === DataSink frontend === */
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BuffHandle
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DataSink::lockBufferFor(FrameID frameNr)
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{
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return impl().claimBufferFor(frameNr);
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}
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void
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DataSink::emit (FrameID frameNr, BuffHandle const& data2emit, TimeValue currentTime)
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{
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OutputSlot::Connection& connection = impl();
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if (connection.isTimely(frameNr,currentTime))
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connection.transfer(data2emit);
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else
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connection.discard(data2emit);
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}
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}} // namespace proc::play
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