mirror of
https://github.com/libretro/scummvm.git
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144 lines
3.5 KiB
C++
144 lines
3.5 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "sound/midiparser.h"
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#include "sound/mididrv.h"
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#include "common/util.h"
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namespace Scumm {
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//////////////////////////////////////////////////
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//
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// The Standard MIDI File version of MidiParser
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//
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//////////////////////////////////////////////////
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class MidiParser_RO : public MidiParser {
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protected:
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int _markerCount; // Number of markers encountered in stream so far
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int _lastMarkerCount; // Cache markers until parsed event is actually consumed
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protected:
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void compressToType0();
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void parseNextEvent (EventInfo &info);
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public:
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bool loadMusic (byte *data, uint32 size);
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uint32 getTick() { return (uint32) _markerCount * _ppqn / 2; }
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};
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//////////////////////////////////////////////////
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//
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// MidiParser_RO implementation
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//
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//////////////////////////////////////////////////
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void MidiParser_RO::parseNextEvent (EventInfo &info) {
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_markerCount += _lastMarkerCount;
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_lastMarkerCount = 0;
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info.delta = 0;
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do {
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info.start = _position._play_pos;
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info.event = *(_position._play_pos++);
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if (info.command() == 0xA) {
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++_lastMarkerCount;
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info.event = 0xF0;
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} else if (info.event == 0xF0) {
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byte delay = *(_position._play_pos++);
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info.delta += delay;
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continue;
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}
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break;
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} while (true);
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// Seems to indicate EOT
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if (info.event == 0) {
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info.event = 0xFF;
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info.ext.type = 0x2F;
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info.length = 0;
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info.ext.data = 0;
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return;
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}
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if (info.event < 0x80)
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return;
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_position._running_status = info.event;
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switch (info.command()) {
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case 0xC:
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info.basic.param1 = *(_position._play_pos++);
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info.basic.param2 = 0;
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break;
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case 0x8: case 0x9: case 0xB:
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info.basic.param1 = *(_position._play_pos++);
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info.basic.param2 = *(_position._play_pos++);
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if (info.command() == 0x9 && info.basic.param2 == 0)
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info.event = info.channel() | 0x80;
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info.length = 0;
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break;
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case 0xF: // Marker and EOT messages
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info.length = 0;
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info.ext.data = 0;
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if (info.event == 0xFF) {
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_autoLoop = true;
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info.ext.type = 0x2F;
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} else {
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info.ext.type = 0x7F; // Bogus META
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}
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info.event = 0xFF;
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break;
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}
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}
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bool MidiParser_RO::loadMusic (byte *data, uint32 size) {
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unloadMusic();
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byte *pos = data;
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if (memcmp (pos, "RO", 2)) {
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warning("'RO' header expected but found '%c%c' instead", pos[0], pos[1]);
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return false;
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}
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_num_tracks = 1;
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_ppqn = 120;
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_tracks[0] = pos + 2;
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_markerCount = _lastMarkerCount = 0;
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// Note that we assume the original data passed in
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// will persist beyond this call, i.e. we do NOT
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// copy the data to our own buffer. Take warning....
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resetTracking();
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setTempo (500000);
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setTrack (0);
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return true;
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}
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MidiParser *MidiParser_createRO() { return new MidiParser_RO; }
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} // End of namespace Scumm
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