mirror of
https://github.com/scummvm/scummvm.git
synced 2026-06-20 05:45:29 +00:00
Torbjörn Andersson
3519516f33
Any track that wants to loop should set the _autoLoop flag itself. Otherwise, as soon as one track has looped every subsequent track handled by the same instance of the parser will also loop. This flag is (at least in the VGA floppy version of MI1) always set at the end of the track, if it's set at all. So if you allowed the lookout music to loop, the game would then get stuck on the chapter screen since the script was waiting for the music to end. As far as I'm aware, this MIDI parser is only used by MI1 (dwa has confirmed that the EGA version had the same bug) and Loom (which, to the best of my knowledge, never loops music).
154 lines
3.8 KiB
C++
154 lines
3.8 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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#include "audio/midiparser.h"
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#include "common/textconsole.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) override;
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public:
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bool loadMusic (byte *data, uint32 size) override;
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uint32 getTick() override { 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._playPos;
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info.event = *(_position._playPos++);
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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 || info.event == 0xF1) {
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byte delay = *(_position._playPos++);
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info.delta += delay;
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if (info.event == 0xF1) {
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// This event is, as far as we have been able
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// to determine, only used in one single song
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// in EGA Loom. It seems to be meant for adding
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// values greater than 255 to info.delta. See
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// bug #2650.
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info.delta += 256;
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}
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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 = nullptr;
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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._runningStatus = info.event;
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switch (info.command()) {
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case 0xC:
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info.basic.param1 = *(_position._playPos++);
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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._playPos++);
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info.basic.param2 = *(_position._playPos++);
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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 = nullptr;
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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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default:
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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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error("'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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_numTracks = 1;
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_autoLoop = false;
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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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