mixer_intern.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 AUDIO_MIXER_INTERN_H
#define AUDIO_MIXER_INTERN_H

#include "common/scummsys.h"
#include "common/mutex.h"
#include "audio/mixer.h"

namespace Audio {

class MixerImpl : public Mixer {
private:
    enum {
        NUM_CHANNELS = 32
    };

    Common::Mutex _mutex;

    const uint _sampleRate;
    const bool _stereo;
    const uint _outBufSize;
    bool _mixerReady;
    uint32 _handleSeed;

    struct SoundTypeSettings {
        SoundTypeSettings() : mute(false), volume(kMaxMixerVolume) {}

        bool mute;
        int volume;
    };

    SoundTypeSettings _soundTypeSettings[4];
    Channel *_channels[NUM_CHANNELS];


public:

    MixerImpl(uint sampleRate, bool stereo = true, uint outBufSize = 0);
    ~MixerImpl();

    virtual bool isReady() const { Common::StackLock lock(_mutex); return _mixerReady; }

    virtual Common::Mutex &mutex() { return _mutex; }

    virtual void playStream(
        SoundType type,
        SoundHandle *handle,
        AudioStream *input,
        int id, byte volume, int8 balance,
        DisposeAfterUse::Flag autofreeStream,
        bool permanent,
        bool reverseStereo);

    virtual void stopAll();
    virtual void stopID(int id);
    virtual void stopHandle(SoundHandle handle);

    virtual void pauseAll(bool paused);
    virtual void pauseID(int id, bool paused);
    virtual void pauseHandle(SoundHandle handle, bool paused);

    virtual bool isSoundIDActive(int id);
    virtual int getSoundID(SoundHandle handle);

    virtual bool isSoundHandleActive(SoundHandle handle);

    virtual void muteSoundType(SoundType type, bool mute);
    virtual bool isSoundTypeMuted(SoundType type) const;

    virtual void setChannelVolume(SoundHandle handle, byte volume);
    virtual byte getChannelVolume(SoundHandle handle);
    virtual void setChannelBalance(SoundHandle handle, int8 balance);
    virtual int8 getChannelBalance(SoundHandle handle);
    virtual void setChannelRate(SoundHandle handle, uint32 rate);
    virtual uint32 getChannelRate(SoundHandle handle);
    virtual void resetChannelRate(SoundHandle handle);

    virtual uint32 getSoundElapsedTime(SoundHandle handle);
    virtual Timestamp getElapsedTime(SoundHandle handle);

    virtual void loopChannel(SoundHandle handle);

    virtual bool hasActiveChannelOfType(SoundType type);

    virtual void setVolumeForSoundType(SoundType type, int volume);
    virtual int getVolumeForSoundType(SoundType type) const;

    virtual uint getOutputRate() const;
    virtual bool getOutputStereo() const;
    virtual uint getOutputBufSize() const;

protected:
    void insertChannel(SoundHandle *handle, Channel *chan);

public:
    int mixCallback(byte *samples, uint len);

    void setReady(bool ready);
};

} // End of namespace Audio

#endif