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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* audiooutputengine.h
*
* Thu Sep 16 10:27:01 CEST 2010
* Copyright 2010 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 <cstddef>
#include <string>
#include <audiotypes.h>
#include "channel.h"
class AudioOutputEngine
{
public:
virtual ~AudioOutputEngine() = default;
virtual bool init(const Channels& channels) = 0;
virtual void setParm(const std::string& parm, const std::string& value) = 0;
virtual bool start() = 0;
virtual void stop() = 0;
virtual void pre(std::size_t nsamples) = 0;
virtual void run(int ch, sample_t *samples, std::size_t nsamples) = 0;
virtual void post(std::size_t nsamples) = 0;
//! Overload this method to use internal buffer directly.
virtual sample_t *getBuffer(int ch) const { return NULL; }
//! Overload this method to force engine to use different buffer size.
virtual std::size_t getBufferSize() const { return 1024; }
virtual std::size_t getSamplerate() const = 0;
virtual bool isFreewheeling() const = 0;
//! Overload this method to get notification of latency changes.
//! \param latency The new latency in samples.
virtual void onLatencyChange(std::size_t latency) {}
};
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