86 lines
2.8 KiB
C++
86 lines
2.8 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_MIDIPARSER_M_H
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#define NUVIE_SOUND_MIDIPARSER_M_H
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#include "audio/midiparser.h"
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#include "common/stack.h"
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#include "common/util.h"
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namespace Ultima {
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namespace Nuvie {
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/**
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* A parser for the music format M, used by Times Of Lore, Bad Blood and
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* Ultima 6.
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* This format is not really a MIDI format; it targets the OPL2 chip. However,
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* it has several things in common with MIDI: it is a stream of events, it has
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* note on and note off events and events similar to MIDI controllers, the high
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* nibble of the first event byte is the command while the low nibble is
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* usually the channel.
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* The commands are different. M does not use the status byte / data byte
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* convention and delta times are specified using a wait command. It uses
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* channels 0-8, corresponding to the 9 OPL2 channels. OPL rhythm mode is not
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* used.
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*/
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class MidiParser_M : public MidiParser {
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protected:
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struct LoopData {
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byte numLoops;
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const byte *startPos;
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const byte *returnPos;
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};
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public:
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MidiParser_M(int8 source = -1);
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~MidiParser_M();
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bool loadMusic(const byte *data, uint32 size) override;
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void unloadMusic() override;
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void onTimer() override;
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protected:
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bool processEvent(const EventInfo &info, bool fireEvents = true) override;
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void parseNextEvent(EventInfo &info) override;
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void allNotesOff() override;
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uint32 _trackLength;
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// The point in the MIDI data where the global loop (not using the stack)
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// has started and will return.
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const byte *_loopPoint;
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// A stack of nested loops, similar to a call stack. A call command will
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// specify an offset where the parser should jump to (startPus), plus a
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// number of times the data from this offset up to the return command should
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// be repeated (numLoops). Then the parser resumes with the command after
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// the call command (returnPos). A maximum depth of 16 levels is supported.
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Common::FixedStack<LoopData, 16> *_loopStack;
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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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