SndWrapALSA.h

/*
* Copyright (C) TES Electronic Solutions GmbH,
* All Rights Reserved.
* Contact: info@guiliani.de
*
* This file is part of the Guiliani HMI framework
* for the development of graphical user interfaces on embedded systems.
*/
 
#ifndef __SNDWRAPALSA_H__
#define __SNDWRAPALSA_H__
 
#include "SndWrapLinux.h"
 
#define ALSA_PCM_NEW_HW_PARAMS_API
#include <alsa/asoundlib.h>
 
 
// @guiliani_doxygen limitations CSndWrapALSA
// @endguiliani_doxygen
class CSndWrapALSA: public CSndWrapLinux
{
public:
    static void CreateInstance(const eC_UInt uiNOFPeriods = 2, const eC_UInt uiStackSize = 100, const ThreadPriority_t kThreadPriority = GUITHREAD_PRIORITY_NOT_SET);
    eC_Bool SetVolume(eC_UByte ubVolume = 0xff);
    eC_UByte GetVolume();
 
protected:
    CSndWrapALSA(const eC_UInt uiNOFPeriods, const eC_UInt uiStackSize, const ThreadPriority_t kThreadPriority);
 
private:
 
    class CPlayThread: public CSndWrapLinux::CPlayThreadBase
    {
    public:
        CPlayThread(const eC_UInt uiNOFPeriods, const eC_UInt uiStackSize, const ThreadPriority_t kThreadPriority);
 
        ~CPlayThread();
 
        void Play(const CSound& kSound);
 
        void Pause();
 
        void Resume();
 
        void Stop();
 
    private:
        void Execute(void *pArg);
 
        eC_Bool m_bPlay;         
        eC_Bool m_bPause;        
        snd_pcm_t* m_pPCMHandle; 
        eC_UInt m_uiNOFPeriods;  
    };
 
    eC_Bool PrepareMixerElement(snd_mixer_t* pkHandle, snd_mixer_elem_t*& pkMixerElement, long& lMin, long& lMax);
};
#endif //#ifndef __SNDWRAPALSA_H__