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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* inputfilter.h
*
* Tue Jun 14 20:42:52 CEST 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include "engineevent.h"
//! An abstract filter component for the InputProcessor class filter chain.
class InputFilter
{
public:
virtual ~InputFilter() = default;
//! Implement to filter a single event.
//! \param[in,out] event The event being processed. The filter method
//! might alter any of the event parameters.
//! \param pos The absolute position of the buffer in which the event in
//! event was received. Add event.pos to it to get the absolute position of
//! the event in the stream.
//! \return true to keep the event, false to discard it.
virtual bool filter(event_t& event, std::size_t pos) = 0;
//! Returns the filter delay in samples.
//! Overload if needed.
virtual std::size_t getLatency() const
{
return 0;
}
};
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