soundmixer.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/>.
 *
 *
 * This file is dual-licensed.
 * In addition to the GPLv3 license mentioned above, this code is also
 * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
 * full text of the license.
 *
 */
 
#ifndef GOB_SOUND_SOUNDMIXER_H
#define GOB_SOUND_SOUNDMIXER_H
 
#include "common/mutex.h"
#include "common/frac.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
 
namespace Gob {
 
class SoundDesc;
 
class SoundMixer : public Audio::AudioStream {
public:
    SoundMixer(Audio::Mixer &mixer, Audio::Mixer::SoundType type);
    ~SoundMixer() override;
 
    virtual void play(SoundDesc &sndDesc, int16 repCount,
            int16 frequency, int16 fadeLength = 0);
    virtual void stop(int16 fadeLength);
 
    bool isPlaying() const;
    char getPlayingSound() const;
 
    void setRepeating(int32 repCount);
 
    int readBuffer(int16 *buffer, const int numSamples) override;
    bool isStereo() const override { return false; }
    bool endOfData() const override { return _end; }
    bool endOfStream() const override { return false; }
    int getRate() const override { return _rate; }
 
protected:
    Audio::Mixer *_mixer;
 
    Audio::SoundHandle _handle;
    Common::Mutex _mutex;
 
    bool _16bit;
 
    bool _end;
    byte *_data;
    uint32 _length;
    uint32 _rate;
    int32 _freq;
    int32 _repCount;
 
    uint32 _offset;
    frac_t _offsetFrac;
    frac_t _offsetInc;
 
    int16 _cur;
    int16 _last;
 
    bool _fade;
    int32 _fadeVol;
    int32 _fadeVolStep;
    uint8 _fadeLength;
    uint32 _fadeSamples;
    uint32 _curFadeSamples;
 
    char _playingSound;
 
    virtual void setSample(SoundDesc &sndDesc, int16 repCount,
            int16 frequency, int16 fadeLength);
    virtual void checkEndSample();
    virtual void endFade();
 
private:
    inline int16 getData(int offset);
};
 
} // End of namespace Gob
 
#endif // GOB_SOUND_SOUNDMIXER_H