player_v2.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 SCUMM_PLAYERS_PLAYER_V2_H
#define SCUMM_PLAYERS_PLAYER_V2_H
 
#include "scumm/players/player_v2base.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
 
namespace Scumm {
 
class Player_V2 : public Audio::AudioStream, public Player_V2Base {
public:
    Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
    ~Player_V2() override;
 
    // MusicEngine API
    void setMusicVolume(int vol) override;
    void startSound(int sound) override;
    void stopSound(int sound) override;
    void stopAllSounds() override;
//  virtual int  getMusicTimer();
    int  getSoundStatus(int sound) const override;
 
    // AudioStream API
    int readBuffer(int16 *buffer, const int numSamples) override;
    bool isStereo() const override { return true; }
    bool endOfData() const override { return false; }
    int getRate() const override { return _sampleRate; }
 
protected:
    enum {
        FIXP_SHIFT = 16
    };
 
    unsigned int _update_step;
    unsigned int _decay;
    int _level;
    unsigned int _RNG;
    unsigned int _volumetable[16];
 
    int _timer_count[4];
    int _timer_output;
 
    Audio::Mixer *_mixer;
    Audio::SoundHandle _soundHandle;
    const uint32 _sampleRate;
 
    Common::Mutex _mutex;
 
    uint32 _next_tick;
    uint32 _tick_len;
 
protected:
    virtual void generateSpkSamples(int16 *data, uint len);
    virtual void generatePCjrSamples(int16 *data, uint len);
 
    void lowPassFilter(int16 *data, uint len);
    void squareGenerator(int channel, int freq, int vol,
                        int noiseFeedback, int16 *sample, uint len);
};
 
} // End of namespace Scumm
 
#endif