audio.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 TWP_AUDIO_H
#define TWP_AUDIO_H
 
#include "common/str.h"
#include "common/array.h"
#include "common/stream.h"
#include "audio/mixer.h"
#include "twp/ggpack.h"
 
namespace Audio {
 
class SeekableAudioStream;
}
 
namespace Twp {
 
enum {
    NUM_AUDIO_SLOTS = 32
};
 
class AudioChannel;
class SoundDefinition;
 
class SoundDefinition;
class SoundStream : public Common::SeekableReadStream {
public:
    void open(Common::SharedPtr<SoundDefinition> sndDef);
 
    virtual uint32 read(void *dataPtr, uint32 dataSize) override;
    virtual bool eos() const override;
 
    virtual int64 pos() const override;
    virtual int64 size() const override;
    virtual bool seek(int64 offset, int whence = SEEK_SET) override;
 
private:
    MemStream _stream;
};
 
class SoundDefinition {
public:
    friend class SoundStream;
 
public:
    SoundDefinition(const Common::String &name);
 
    void load();
    int getId() const { return _id; }
    Common::String getName() const { return _name; }
 
private:
    int _id;                     // identifier for this sound
    Common::String _name;        // name of the sound to load
    Common::Array<byte> _buffer; // buffer containing the sound data
    bool _loaded = false;        // indicates whether or not the sound buffer has been loaded
};
 
struct AudioSlot {
    Audio::SoundHandle handle;                                         // handle returned when this sound has been played
    Common::SharedPtr<SoundDefinition> sndDef;                         // sound definition associated to this slot
    SoundStream stream;                                                // audio stream
    bool busy = false;                                                 // is sound active
    float volume = 1.f;                                                // actual volume for this slot
    float fadeInTimeMs = 0.f;                                          // fade-in time in milliseconds
    float fadeOutTimeMs = 0.f;                                         // fade-out time in milliseconds
    int total = 0;                                                     // duration of the sound in milliseconds
    int id = 0;                                                        // unique sound ID
    int objId = 0;                                                     // object ID or 0 if none
    int loopTimes = 0;                                                 // specified number of times to loop
    Audio::Mixer::SoundType soundType = Audio::Mixer::kPlainSoundType; // sound type: plain, music, sfx, speech
};
 
class AudioSystem {
public:
    int play(Common::SharedPtr<SoundDefinition> sndDef, Audio::Mixer::SoundType cat, int loopTimes = 0, float fadeInTimeMs = 0.f, float volume = 1.f, int objId = 0);
 
    bool playing(int id) const;
    bool playing(Common::SharedPtr<SoundDefinition> soundDef) const;
 
    void fadeOut(int id, float fadeTime);
    void stop(int id);
 
    void setMasterVolume(float vol);
    float getMasterVolume() const;
    void setVolume(int id, float vol);
 
    int getElapsed(int id) const;
    int getDuration(int id) const;
 
    void update(float elapsed);
 
    Common::Array<Common::SharedPtr<SoundDefinition> > _soundDefs;
    AudioSlot _slots[NUM_AUDIO_SLOTS];
    Common::SharedPtr<SoundDefinition> _soundHover; // not used yet, should be used in the GUI
 
private:
    void updateVolume(AudioSlot *slot);
    AudioSlot *getFreeSlot();
 
private:
    float _masterVolume = 1.f;
};
 
} // End of namespace Twp
 
#endif // TWP_H