sfx_player.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/>.
 *
 */

#ifndef AWE_SFX_PLAYER_H
#define AWE_SFX_PLAYER_H

#include "awe/intern.h"

namespace Awe {

struct SfxInstrument {
    uint8 *data = nullptr;
    uint16 volume = 0;

    void clear();
};

struct SfxModule {
    const uint8 *data = nullptr;
    uint16 curPos = 0;
    uint8 curOrder = 0;
    uint8 numOrder = 0;
    uint8 *orderTable = nullptr;
    SfxInstrument samples[15];

    void clear();
    void clearSamples();
};

struct SfxPattern {
    uint16 note_1 = 0;
    uint16 note_2 = 0;
    uint16 sampleStart = 0;
    uint8 *sampleBuffer = nullptr;
    uint16 sampleLen = 0;
    uint16 loopPos = 0;
    uint16 loopLen = 0;
    uint16 sampleVolume = 0;
};

struct SfxChannel {
    uint8 *sampleData = nullptr;
    uint16 sampleLen = 0;
    uint16 sampleLoopPos = 0;
    uint16 sampleLoopLen = 0;
    uint16 volume = 0;
    Frac pos;
};

struct Resource;

struct SfxPlayer {
    enum {
        NUM_CHANNELS = 4
    };

    Resource *_res;

    uint16 _delay = 0;
    uint16 _resNum = 0;
    SfxModule _sfxMod;
    int16 *_syncVar = nullptr;
    bool _playing = false;
    int _rate = 0;
    int _samplesLeft = 0;
    SfxChannel _channels[NUM_CHANNELS];

    SfxPlayer(Resource *res);

    void setEventsDelay(uint16 delay);
    void loadSfxModule(uint16 resNum, uint16 delay, uint8 pos);
    void prepareInstruments(const uint8 *p);
    void play(int rate);
    void mixSamples(int16 *buf, int len);
    void readSamples(int16 *buf, int len);
    void start();
    void stop();
    void handleEvents();
    void handlePattern(uint8 channel, const uint8 *patternData);
};

} // namespace Awe

#endif