99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 General Public License as published by
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* the Free Software Foundation, either version 3 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 General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef NUVIE_SOUND_MIDIDRV_M_MT32_H
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#define NUVIE_SOUND_MIDIDRV_M_MT32_H
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#include "audio/mt32gm.h"
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namespace Ultima {
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namespace Nuvie {
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// An assignment of a MIDI instrument to a MIDI output channel. M data channels
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// using this instrument will be mapped to the specified MIDI channel.
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struct MInstrumentAssignment {
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int8 midiChannel;
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uint8 midiInstrument;
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};
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/**
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* M driver for the Roland MT-32.
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* The M format is focused on OPL2 and conversion to MIDI is rudimentary. Only
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* note on/off, channel volume (using note velocity) and program change are
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* implemented by the original driver.
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* A mapping of M instruments to MIDI instruments must be set using
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* setInstrumentAssignments before starting playback of a track.
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*/
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class MidiDriver_M_MT32 : public MidiDriver_MT32GM {
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protected:
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/**
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* Playback status information for an M channel.
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* Note that although this data applies to an M data channel, the values
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* are MIDI note and velocity values.
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*/
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struct MChannelData {
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// The MIDI note currently played on this channel.
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int8 activeNote = -1;
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// The MIDI note velocity currently used on this channel.
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uint8 velocity = 0;
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// The MIDI note queued for playback on this channel.
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int8 queuedNote = -1;
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};
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// Converts M note values to MIDI notes.
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static const uint8 MIDI_NOTE_MAP[24];
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public:
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MidiDriver_M_MT32();
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~MidiDriver_M_MT32();
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using MidiDriver_MT32GM::open;
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int open(MidiDriver *driver, bool nativeMT32) override;
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using MidiDriver_MT32GM::send;
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void send(int8 source, uint32 b) override;
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void metaEvent(int8 source, byte type, const byte *data, uint16 length) override;
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/**
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* Sets the assignments of the 16 M instruments to the MIDI instruments and
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* MIDI output channels they should use.
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*
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* @param assignments An instrument assignment array of length 16
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*/
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void setInstrumentAssignments(const MInstrumentAssignment *assignments);
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void stopAllNotes(bool stopSustainedNotes) override;
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protected:
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void onTimer() override;
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MChannelData _mChannelData[9];
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// Mapping of M instrument numbers to MIDI output channels
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int8 _mInstrumentMidiChannels[16];
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// Mapping of M instrument numbers to MIDI instrument numbers
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uint8 _mInstrumentMapping[16];
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};
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} // End of namespace Nuvie
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} // End of namespace Ultima
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#endif
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