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 1.1 2000/09/28 18:43:10 ijr Exp $
____________________________________________________________________________*/

#ifndef INCLUDED_SOUNDCARDPMO_H_
#define INCLUDED_SOUNDCARDPMO_H_

/* system headers */
#include <stdlib.h>
#include <dmedia/audio.h>

/* project headers */
#include "config.h"
#include "thread.h"
#include "mutex.h"
#include "pmo.h"
#include "pmoevent.h"
#include "eventbuffer.h"

static const uint32 OBUFFERSIZE = 2 * 1152;
enum
{
   pmoError_MinimumError = 4000,
   pmoError_DeviceOpenFailed,
   pmoError_IOCTL_F_GETFL,
   pmoError_IOCTL_F_SETFL,
   pmoError_IOCTL_SNDCTL_DSP_RESET,
   pmoError_IOCTL_SNDCTL_DSP_SAMPLESIZE,
   pmoError_IOCTL_SNDCTL_DSP_STEREO,
   pmoError_IOCTL_SNDCTL_DSP_SPEED,
   pmoError_MaximumError
};

class FAContext;

class SoundCardPMO:public PhysicalMediaOutput
{
 public:

            SoundCardPMO(FAContext *context);
   virtual ~SoundCardPMO();

   virtual Error Init(OutputInfo * info);

   static void   StartWorkerThread(void *);
          void   GetVolume(int32 &left, int32 &right);
          void   SetVolume(int32 left, int32 right);

 private:
   void          WorkerThread(void); 
   virtual Error Reset(bool user_stop);
   void          HandleTimeInfoEvent(PMOTimeInfoEvent *pEvent);
   bool          WaitForDrain(void);

   bool         m_properlyInitialized;
   uint32       channels;
   ALport       outaudioport;
   int          audio_fd;
   OutputInfo  *myInfo;
   Thread      *m_pBufferThread;
   int          m_iOutputBufferSize, m_iBytesPerSample, m_iTotalFragments;
   long long    m_iTotalBytesWritten;
   int          m_iLastFrame;
   unsigned     m_iDataSize;
};

#endif /* _SOUNDCARDPMO_H_ */