cSoundBase.h

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//
//
 
#ifndef _INC_cSoundBase_H
#define _INC_cSoundBase_H
#ifndef NO_PRAGMA_ONCE
#pragma once
#endif
 
#include "../GrayLibBase.h"
#include "GrayCore/include/IUnknown.h"
 
#ifdef _WIN32
#include <mmsystem.h>   // WAVEFORMATEX
#else
struct tWAVEFORMATEX;
#endif
 
namespace GrayLib
{
#ifdef UNDER_CE
#define _GTNSND(_x) _x
#else
#define _GTNSND _GTN
#endif
 
        typedef WORD SOUND_VOL_t;               
        typedef DWORD SOUND_VOL2_t;             
        class cWaveFormatEx;                    
 
        MIDL_INTERFACE("0C3E2E71-B93C-11d2-AAD0-006007654234") ISoundObject : public IUnknown
        {
                IGNORE_WARN_INTERFACE(ISoundObject);
                virtual size_t get_WaveDataLength() = 0;
                virtual const void* get_WaveData() = 0;
                virtual const cWaveFormatEx* get_WaveFormat() = 0;
        };
 
        struct GRAYLIB_LINK cSoundBase  // static
        {
                static const SOUND_VOL_t k_VOL_MIN = 0;                 
                static const SOUND_VOL_t k_VOL_MAX = 0xFFFF;    
 
                static LONG GRAYCALL FToDecibelI(float v);
                static float GRAYCALL DecibelItoF(LONG d);
 
                static inline float GRAYCALL VolToF(SOUND_VOL_t v) noexcept
                {
                        return ((float)(v - k_VOL_MIN)) / (k_VOL_MAX - k_VOL_MIN);
                }
                static inline SOUND_VOL_t GRAYCALL FToVol(float v) noexcept
                {
                        return k_VOL_MIN + (SOUND_VOL_t)((k_VOL_MAX - k_VOL_MIN) * v);
                }
 
                static LONG GRAYCALL VolToDecibelI(SOUND_VOL_t v)
                {
                        return FToDecibelI(VolToF(v));
                }
                static SOUND_VOL_t GRAYCALL DecibelItoVol(LONG d)
                {
                        return FToVol(DecibelItoF(d));
                }
 
#ifdef _WIN32
                static inline HRESULT GetHResultFrom(MMRESULT mmRes) noexcept
                {
                        if (mmRes == MMSYSERR_NOERROR)  // 0
                                return S_OK;
                        return HResult::Make(FACILITY_MMSYS, (WORD)mmRes);
                }
#endif
        };
};
 
#endif // _INC_cSoundBase_H