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72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
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* Copyright (C) 2011-2017 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MT32EMU_MIDI_EVENT_QUEUE_H
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#define MT32EMU_MIDI_EVENT_QUEUE_H
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#include "globals.h"
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#include "Types.h"
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namespace MT32Emu {
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/**
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* Used to safely store timestamped MIDI events in a local queue.
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*/
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struct MidiEvent {
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Bit32u shortMessageData;
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const Bit8u *sysexData;
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Bit32u sysexLength;
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Bit32u timestamp;
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~MidiEvent();
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void setShortMessage(Bit32u shortMessageData, Bit32u timestamp);
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void setSysex(const Bit8u *sysexData, Bit32u sysexLength, Bit32u timestamp);
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};
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/**
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* Simple queue implementation using a ring buffer to store incoming MIDI event before the synth actually processes it.
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* It is intended to:
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* - get rid of prerenderer while retaining graceful partial abortion
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* - add fair emulation of the MIDI interface delays
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* - extend the synth interface with the default implementation of a typical rendering loop.
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* THREAD SAFETY:
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* It is safe to use either in a single thread environment or when there are only two threads - one performs only reading
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* and one performs only writing. More complicated usage requires external synchronisation.
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*/
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class MidiEventQueue {
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private:
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MidiEvent * const ringBuffer;
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const Bit32u ringBufferMask;
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volatile Bit32u startPosition;
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volatile Bit32u endPosition;
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public:
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MidiEventQueue(Bit32u ringBufferSize = DEFAULT_MIDI_EVENT_QUEUE_SIZE); // Must be a power of 2
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~MidiEventQueue();
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void reset();
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bool pushShortMessage(Bit32u shortMessageData, Bit32u timestamp);
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bool pushSysex(const Bit8u *sysexData, Bit32u sysexLength, Bit32u timestamp);
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const MidiEvent *peekMidiEvent();
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void dropMidiEvent();
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bool isFull() const;
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bool inline isEmpty() const;
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};
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} // namespace MT32Emu
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#endif // #ifndef MT32EMU_MIDI_EVENT_QUEUE_H
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