YiAudioEngine.h

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// ©️ You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_AUDIO_ENGINE_H_
#define _YI_AUDIO_ENGINE_H_

#include <framework/YiPredef.h>
#include <signal/YiSignalHandler.h>
#include <thread/YiMutex.h>
#include <utility/YiString.h>

#include <map>
#include <memory>
#include <vector>

class CYIAssetSound;
class CYIAudioStream;
class CYISoundInstance;

class CYIAudioEngine : public CYISignalHandler
{
public:
    static std::unique_ptr<CYIAudioEngine> Create();

    virtual ~CYIAudioEngine();

    virtual uint32_t GetSampleRate() const = 0;

    virtual uint32_t GetChannelCount() const = 0;

    virtual void RegisterStream(const std::shared_ptr<CYIAudioStream> &pStreamToAdd);

    virtual void UnregisterStream(const std::shared_ptr<CYIAudioStream> &pStreamToRemove);

    virtual void PlaySound(const CYIString &name, float volume = 1.0f);

    virtual void PlaySound(const std::shared_ptr<CYIAssetSound> &pAsset, float volume = 1.0f);

    virtual std::shared_ptr<CYISoundInstance> CreateSoundInstance(const CYIString &name);

    virtual std::shared_ptr<CYISoundInstance> CreateSoundInstance(const std::shared_ptr<CYIAssetSound> &pAsset);

    virtual void ClearCache();

    void Enable();

    void Disable();

    bool IsEnabled() const;

protected:
    CYIAudioEngine();

    virtual void Process(float *pData, uint32_t uFrameCount);

private:
    void DoEnable();
    void DoDisable();

    virtual void WillEnable() = 0;

    virtual void DidDisable() = 0;

    void EnteredBackground();
    void EnteredForeground();

    std::shared_ptr<CYIAssetSound> GetAssetSound(const CYIString &name);
    void ClearStreams();

    std::atomic<bool> m_bUserEnabled;
    std::atomic<bool> m_bEnabled;
    CYIMutex m_streamsMutex;
    std::vector<std::weak_ptr<CYIAudioStream>> m_streams;
    std::map<CYIString, std::shared_ptr<CYIAssetSound>> m_assetSounds;
    std::vector<std::shared_ptr<CYISoundInstance>> m_soundInstances;
};

#endif // _YI_AUDIO_ENGINE_H_