music.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/>.
 *
 */

// Music class

#ifndef TINSEL_MUSIC_H
#define TINSEL_MUSIC_H

#include "audio/midiplayer.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
#include "common/mutex.h"

class MidiParser;

namespace Tinsel {

class Music {
public:
    Music() : _currentMidi(0), _currentLoop(false) {
        _midiBuffer.pDat = nullptr;
        _midiBuffer.size = 0;
    }

    bool PlayMidiSequence(      // Plays the specified MIDI sequence through the sound driver
        uint32 dwFileOffset,        // handle of MIDI sequence data
        bool bLoop);            // Whether to loop the sequence

    bool MidiPlaying();     // Returns TRUE if a Midi tune is currently playing

    bool StopMidi();        // Stops any currently playing midi

    void SetMidiVolume(     // Sets the volume of the MIDI music. Returns the old volume
        int vol);       // new volume - 0..MAXMIDIVOL

    int GetMidiVolume();

    void OpenMidiFiles();
    void DeleteMidiBuffer();

    void CurrentMidiFacts(SCNHANDLE *pMidi, bool *pLoop);
    void RestoreMidiFacts(SCNHANDLE Midi, bool Loop);

    int GetTrackNumber(SCNHANDLE hMidi);
    SCNHANDLE GetTrackOffset(int trackNumber);

    uint8 *GetMidiBuffer() { return _midiBuffer.pDat; }

    uint8* ResizeMidiBuffer(uint32 newSize) {
        if (_midiBuffer.size < newSize) {
            _midiBuffer.pDat = (byte*)realloc(_midiBuffer.pDat, newSize);
            assert(_midiBuffer.pDat);
        }

        return _midiBuffer.pDat;
    }

    void dumpMusic();

private:
    // sound buffer structure used for MIDI data and samples
    struct SOUND_BUFFER {
        uint8 *pDat;        // pointer to actual buffer
        uint32 size;        // size of the buffer
    };

    // MIDI buffer
    SOUND_BUFFER _midiBuffer;

    SCNHANDLE   _currentMidi;
    bool        _currentLoop;

    // We allocate 155 entries because that's the maximum, used in the SCN version
    SCNHANDLE _midiOffsets[155];
};

class MidiMusicPlayer : public Audio::MidiPlayer {
public:
    MidiMusicPlayer(TinselEngine *vm);

    void setVolume(int volume) override;

    void playMIDI(uint32 size, bool loop);

//  void stop();
    void pause() override;
    void resume() override;

    // MidiDriver_BASE interface implementation
    void send(uint32 b) override;

    // The original sets the "sequence timing" to 109 Hz, whatever that
    // means. The default is 120.
    uint32 getBaseTempo()   { return _driver ? (109 * _driver->getBaseTempo()) / 120 : 0; }

    bool _milesAudioMode;

private:
    void playXMIDI(uint32 size, bool loop);
    void playSEQ(uint32 size, bool loop);
};

class PCMMusicPlayer : public Audio::AudioStream {
public:
    PCMMusicPlayer();
    ~PCMMusicPlayer() override;

    bool isPlaying() const;

    bool isDimmed() const;

    void getTunePlaying(void *voidPtr, int length);
    void restoreThatTune(void *voidPtr);

    void setMusicSceneDetails(SCNHANDLE hScript, SCNHANDLE hSegment, const char *fileName);

    void setVolume(int volume);

    void startPlay(int id);
    void stopPlay();

    bool getMusicTinselDimmed() const;
    void dim(bool bTinselDim);
    void unDim(bool bTinselUnDim);
    void dimIteration();

    void startFadeOut(int ticks);
    void fadeOutIteration();

    int readBuffer(int16 *buffer, const int numSamples) override;
    bool isStereo() const override;
    bool endOfData() const override { return _end; }
    bool endOfStream() const override { return false; }
    int getRate() const override;

protected:
    enum State {
        S_IDLE,
        S_NEW,
        S_MID,
        S_END1,
        S_END2,
        S_END3,
        S_NEXT,
        S_STOP
    };

    Audio::SoundHandle _handle;
    Audio::AudioStream *_curChunk;
    Common::Mutex _mutex;

    bool _end;

    int _silenceSamples;

    State _state, _mState;
    bool _forcePlay;
    int32 _scriptNum;
    int32 _scriptIndex;
    SCNHANDLE _hScript;
    SCNHANDLE _hSegment;
    Common::Path _filename;

    uint8 _volume;

    bool _dimmed;
    bool _dimmedTinsel;
    uint8 _dimmedVolume;
    int _dimIteration;
    int _dimPosition;

    uint8 _fadeOutVolume;
    int _fadeOutIteration;

    void play();
    void stop();
    void setVol(uint8 volume);

    bool getNextChunk();

    void loadMusicFromSegment(int segmentNum);
    void loadADPCMMusicFromSegment(int segmentNum);
    void loadMP3MusicFromSegment(int segmentNum);
};

} // End of namespace Tinsel

#endif