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/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
* Copyright (C) 2011-2017 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
*
* This program 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 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MT32EMU_MIDI_STREAM_PARSER_H
#define MT32EMU_MIDI_STREAM_PARSER_H
#include "globals.h"
#include "Types.h"
namespace MT32Emu {
class Synth;
// Interface for a user-supplied class to receive parsed well-formed MIDI messages.
class MT32EMU_EXPORT MidiReceiver {
public:
// Invoked when a complete short MIDI message is parsed in the input MIDI stream.
virtual void handleShortMessage(const Bit32u message) = 0;
// Invoked when a complete well-formed System Exclusive MIDI message is parsed in the input MIDI stream.
virtual void handleSysex(const Bit8u stream[], const Bit32u length) = 0;
// Invoked when a System Realtime MIDI message is parsed in the input MIDI stream.
virtual void handleSystemRealtimeMessage(const Bit8u realtime) = 0;
protected:
~MidiReceiver() {}
};
// Interface for a user-supplied class to receive notifications of input MIDI stream parse errors.
class MT32EMU_EXPORT MidiReporter {
public:
// Invoked when an error occurs during processing the input MIDI stream.
virtual void printDebug(const char *debugMessage) = 0;
protected:
~MidiReporter() {}
};
// Provides a context for parsing a stream of MIDI events coming from a single source.
// There can be multiple MIDI sources feeding MIDI events to a single Synth object.
// NOTE: Calls from multiple threads which feed a single Synth object with data must be explicitly synchronised,
// although, no synchronisation is required with the rendering thread.
class MT32EMU_EXPORT MidiStreamParserImpl {
public:
// The first two arguments provide for implementations of essential interfaces needed.
// The third argument specifies streamBuffer initial capacity. The buffer capacity should be large enough to fit the longest SysEx expected.
// If a longer SysEx occurs, streamBuffer is reallocated to the maximum size of MAX_STREAM_BUFFER_SIZE (32768 bytes).
// Default capacity is SYSEX_BUFFER_SIZE (1000 bytes) which is enough to fit SysEx messages in common use.
MidiStreamParserImpl(MidiReceiver &, MidiReporter &, Bit32u initialStreamBufferCapacity = SYSEX_BUFFER_SIZE);
virtual ~MidiStreamParserImpl();
// Parses a block of raw MIDI bytes. All the parsed MIDI messages are sent in sequence to the user-supplied methods for further processing.
// SysEx messages are allowed to be fragmented across several calls to this method. Running status is also handled for short messages.
// NOTE: the total length of a SysEx message being fragmented shall not exceed MAX_STREAM_BUFFER_SIZE (32768 bytes).
void parseStream(const Bit8u *stream, Bit32u length);
// Convenience method which accepts a Bit32u-encoded short MIDI message and sends it to the user-supplied method for further processing.
// The short MIDI message may contain no status byte, the running status is used in this case.
void processShortMessage(const Bit32u message);
private:
Bit8u runningStatus;
Bit8u *streamBuffer;
Bit32u streamBufferCapacity;
Bit32u streamBufferSize;
MidiReceiver &midiReceiver;
MidiReporter &midiReporter;
// Binary compatibility helper.
void *reserved;
bool checkStreamBufferCapacity(const bool preserveContent);
bool processStatusByte(Bit8u &status);
Bit32u parseShortMessageStatus(const Bit8u stream[]);
Bit32u parseShortMessageDataBytes(const Bit8u stream[], Bit32u length);
Bit32u parseSysex(const Bit8u stream[], const Bit32u length);
Bit32u parseSysexFragment(const Bit8u stream[], const Bit32u length);
}; // class MidiStreamParserImpl
// An abstract class that provides a context for parsing a stream of MIDI events coming from a single source.
class MT32EMU_EXPORT MidiStreamParser : public MidiStreamParserImpl, protected MidiReceiver, protected MidiReporter {
public:
// The argument specifies streamBuffer initial capacity. The buffer capacity should be large enough to fit the longest SysEx expected.
// If a longer SysEx occurs, streamBuffer is reallocated to the maximum size of MAX_STREAM_BUFFER_SIZE (32768 bytes).
// Default capacity is SYSEX_BUFFER_SIZE (1000 bytes) which is enough to fit SysEx messages in common use.
explicit MidiStreamParser(Bit32u initialStreamBufferCapacity = SYSEX_BUFFER_SIZE);
};
class MT32EMU_EXPORT DefaultMidiStreamParser : public MidiStreamParser {
public:
explicit DefaultMidiStreamParser(Synth &synth, Bit32u initialStreamBufferCapacity = SYSEX_BUFFER_SIZE);
void setTimestamp(const Bit32u useTimestamp);
void resetTimestamp();
protected:
void handleShortMessage(const Bit32u message);
void handleSysex(const Bit8u *stream, const Bit32u length);
void handleSystemRealtimeMessage(const Bit8u realtime);
void printDebug(const char *debugMessage);
private:
Synth &synth;
bool timestampSet;
Bit32u timestamp;
};
} // namespace MT32Emu
#endif // MT32EMU_MIDI_STREAM_PARSER_H
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