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Diffstat (limited to 'engines/scumm/midiparser_ro.cpp')
-rw-r--r-- | engines/scumm/midiparser_ro.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/engines/scumm/midiparser_ro.cpp b/engines/scumm/midiparser_ro.cpp new file mode 100644 index 0000000000..b240ffb5fd --- /dev/null +++ b/engines/scumm/midiparser_ro.cpp @@ -0,0 +1,143 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2001-2006 The ScummVM project + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * 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 General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + * + */ + +#include "common/stdafx.h" +#include "sound/midiparser.h" +#include "sound/mididrv.h" +#include "common/util.h" + +namespace Scumm { + +////////////////////////////////////////////////// +// +// The Standard MIDI File version of MidiParser +// +////////////////////////////////////////////////// + +class MidiParser_RO : public MidiParser { +protected: + int _markerCount; // Number of markers encountered in stream so far + int _lastMarkerCount; // Cache markers until parsed event is actually consumed + +protected: + void compressToType0(); + void parseNextEvent (EventInfo &info); + +public: + bool loadMusic (byte *data, uint32 size); + uint32 getTick() { return (uint32) _markerCount * _ppqn / 2; } +}; + + + +////////////////////////////////////////////////// +// +// MidiParser_RO implementation +// +////////////////////////////////////////////////// + +void MidiParser_RO::parseNextEvent (EventInfo &info) { + _markerCount += _lastMarkerCount; + _lastMarkerCount = 0; + + info.delta = 0; + do { + info.start = _position._play_pos; + info.event = *(_position._play_pos++); + if (info.command() == 0xA) { + ++_lastMarkerCount; + info.event = 0xF0; + } else if (info.event == 0xF0) { + byte delay = *(_position._play_pos++); + info.delta += delay; + continue; + } + break; + } while (true); + + // Seems to indicate EOT + if (info.event == 0) { + info.event = 0xFF; + info.ext.type = 0x2F; + info.length = 0; + info.ext.data = 0; + return; + } + + if (info.event < 0x80) + return; + + _position._running_status = info.event; + switch (info.command()) { + case 0xC: + info.basic.param1 = *(_position._play_pos++); + info.basic.param2 = 0; + break; + + case 0x8: case 0x9: case 0xB: + info.basic.param1 = *(_position._play_pos++); + info.basic.param2 = *(_position._play_pos++); + if (info.command() == 0x9 && info.basic.param2 == 0) + info.event = info.channel() | 0x80; + info.length = 0; + break; + + case 0xF: // Marker and EOT messages + info.length = 0; + info.ext.data = 0; + if (info.event == 0xFF) { + _autoLoop = true; + info.ext.type = 0x2F; + } else { + info.ext.type = 0x7F; // Bogus META + } + info.event = 0xFF; + break; + } +} + +bool MidiParser_RO::loadMusic (byte *data, uint32 size) { + unloadMusic(); + byte *pos = data; + + if (memcmp (pos, "RO", 2)) { + error("'RO' header expected but found '%c%c' instead", pos[0], pos[1]); + return false; + } + + _num_tracks = 1; + _ppqn = 120; + _tracks[0] = pos + 2; + _markerCount = _lastMarkerCount = 0; + + // Note that we assume the original data passed in + // will persist beyond this call, i.e. we do NOT + // copy the data to our own buffer. Take warning.... + resetTracking(); + setTempo (500000); + setTrack (0); + return true; +} + +MidiParser *MidiParser_createRO() { return new MidiParser_RO; } + +} // End of namespace Scumm |