soundcardpmo.h

FreeAMP(MP3播放)程序源代码-用来研究MP3解码

/*____________________________________________________________________________
    
    FreeAmp - The Free MP3 Player

    Portions Copyright (C) 1998-1999 EMusic.com

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    
    $Id: soundcardpmo.h,v 1.29 2000/11/01 14:22:45 robert Exp $
____________________________________________________________________________*/


#ifndef INCLUDED_SOUNDCARDPMO_H_
#define INCLUDED_SOUNDCARDPMO_H_

/* system headers */
#include <stdlib.h>
#include <windows.h>

/* project headers */
#include "config.h"
#include "pmo.h"
#include "thread.h"
#include "mutex.h"
#include "properties.h"
#include "eventbuffer.h"
#include "preferences.h"
#include "facontext.h"
#include "Win32Volume.h"

class SoundCardPMO : public PhysicalMediaOutput
{

public:
    SoundCardPMO(FAContext *context);
    virtual ~SoundCardPMO();
    
    virtual Error Init(OutputInfo* info);
    virtual void GetVolume(int32 &left, int32 &right);
    virtual void  SetVolume(int32 left, int32 right);

    static void   StartWorkerThread(void *);

 
 private:

    void          WorkerThread(void); 
    virtual Error Reset(bool user_stop);
    void          HandleTimeInfoEvent(PMOTimeInfoEvent *pEvent);
    WAVEHDR      *NextHeader(bool bFreeHeadersOnly = false);
    Error         FreeHeader(uint32 uSize);
    Error         AllocHeader(void *&pBuffer, uint32 &uSize);
    Error         Write(void *pBuffer, uint32 uSize);
    void          Pause(void);
    void          Resume(void);
    void          Clear(void);
    bool          WaitForDrain(void);

 private:
    WAVEFORMATEX*   m_wfex;
    WAVEHDR*        m_wavehdr_array;
    HWAVEOUT        m_hwo;

    uint32          m_buffer[MAXCHANNELS];
    uint32          m_channels;
    uint32          m_samples_per_second;
    uint32          m_hdr_size;
    uint32          m_data_size;
    uint32          m_num_headers;
    uint32          m_samples_per_frame;
    bool            m_initialized, m_bPaused;

    Thread         *m_pBufferThread;
    int             m_iOutputBufferSize, m_iBaseTime, m_iBytesPerSample;
    int             m_iHead, m_iTail, m_iOffset, m_iLastTime;
    
    string          m_oDstLineName, m_oVolumeControlName;
    DWORD           m_dwMinimum, m_dwMaximum, m_dwVolumeControlID;
    char           *pBase;

    Win32Volume    *m_volume;
    HWND            m_hWnd;
};

#endif /* _SOUNDCARDPMO_H_ */