midiparser_qt.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
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 */

#ifndef AUDIO_MIDIPARSER_QT_H
#define AUDIO_MIDIPARSER_QT_H

#include "audio/midiparser.h"
#include "common/array.h"
#include "common/hashmap.h"
#include "common/queue.h"
#include "common/formats/quicktime.h"

class MidiParser_QT : public MidiParser, public Common::QuickTimeParser {
public:
    MidiParser_QT(int8 source = -1) : _source(source) {}
    ~MidiParser_QT() {}

    // MidiParser
    bool loadMusic(byte *data, uint32 size) override;
    void unloadMusic() override;

    bool loadFromTune(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

    bool loadFromContainerStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);

    bool loadFromContainerFile(const Common::Path &fileName);

protected:
    // MidiParser
    void parseNextEvent(EventInfo &info) override;
    void resetTracking() override;

    void sendToDriver(uint32 b) override;
    void sendMetaEventToDriver(byte type, byte *data, uint16 length) override;

    // QuickTimeParser
    SampleDesc *readSampleDesc(Track *track, uint32 format, uint32 descSize) override;

    int8 _source;

private:
    struct MIDITrackInfo {
        byte *data;
        uint32 size;
        uint32 timeScale;
    };

    struct PartStatus {
        uint32 instrument;
        byte volume;
        byte pan;
        uint16 pitchBend;
    };

    class MIDISampleDesc : public SampleDesc {
    public:
        MIDISampleDesc(Common::QuickTimeParser::Track *parentTrack, uint32 codecTag);
        ~MIDISampleDesc() {}

        byte *_requestData;
        uint32 _requestSize;
    };

    uint32 readNextEvent();
    void handleGeneralEvent(uint32 control);
    void handleControllerEvent(uint32 control, uint32 part, byte intPart, byte fracPart);
    void handleNoteEvent(uint32 part, byte pitch, byte velocity, uint32 length);

    void definePart(uint32 part, uint32 instrument);
    void setupPart(uint32 part);

    byte getChannel(uint32 part);
    bool isChannelAllocated(byte channel) const;
    byte findFreeChannel(uint32 part);
    void deallocateFreeChannel();
    void deallocateChannel(byte channel);
    bool allChannelsAllocated() const;

    byte *readWholeTrack(Common::QuickTimeParser::Track *track, uint32 &trackSize);

    Common::Array<MIDITrackInfo> _trackInfo;
    Common::Queue<EventInfo> _queuedEvents;

    typedef Common::HashMap<uint, PartStatus> PartMap;
    PartMap _partMap;

    typedef Common::HashMap<uint, byte> ChannelMap;
    ChannelMap _channelMap;

    void initFromContainerTracks();
    void initCommon();
    uint32 readUint32();
};
#endif