exportmp3.h

Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Mac OS X、Microsoft Windows、GNU/Linux和其它作業系統

/**********************************************************************

  Audacity: A Digital Audio Editor

  ExportMP3.h

  Dominic Mazzoni

**********************************************************************/

#ifndef __AUDACITY_EXPORTMP3__
#define __AUDACITY_EXPORTMP3__

#include <wx/string.h>
#include <wx/dynlib.h>

class AudacityProject;

class MP3Exporter {
   public:
   
      MP3Exporter();
   
      virtual wxString GetLibraryPath() = 0;
      virtual wxString GetLibraryName() = 0;
      virtual wxString GetLibraryMessage() = 0;
      virtual wxString GetLibraryTypeString() = 0;

      virtual bool FindLibrary(wxWindow *parent);
      virtual bool LoadLibrary() = 0;
      virtual bool ValidLibraryLoaded() = 0;
      virtual wxString GetLibraryVersion() = 0;

      /* returns the number of samples PER CHANNEL to send for each call to EncodeBuffer */
      virtual int InitializeStream(int channels, int sampleRate) = 0;
      /* In bytes. must be called AFTER InitializeStream */
      virtual int GetOutBufferSize() = 0;
      /* returns the number of bytes written. input is interleaved if stereo*/
      virtual int EncodeBuffer(short int inbuffer[], unsigned char outbuffer[]) = 0;
      virtual int EncodeRemainder(short int inbuffer[], int nSamples,
                               unsigned char outbuffer[]) = 0;

      virtual int EncodeBufferMono(short int inbuffer[], unsigned char outbuffer[]) = 0;
      virtual int EncodeRemainderMono(short int inbuffer[], int nSamples,
                               unsigned char outbuffer[]) = 0;

      virtual int FinishStream(unsigned char outbuffer[]) = 0;
      virtual void CancelEncoding() = 0;

      /* The number of different quality settings */
      virtual int GetQualityVariance() = 0;
      
      /* These global settings keep state over the life of the object */
      virtual int GetConfigurationCaps() = 0;
      virtual void SetBitrate(int rate) = 0;
      virtual int GetBitrate() = 0;
      virtual void SetQuality(int quality) = 0;
      virtual int GetQuality() = 0;
      virtual ~MP3Exporter() { };

  protected:
   wxString mLibPath;
   wxDynamicLibrary lame_enc_lib;
};

#define MP3CONFIG_BITRATE 0x00000001
#define MP3CONFIG_QUALITY 0x00000002

MP3Exporter *GetMP3Exporter();
void         ReleaseMP3Exporter();
        
bool ExportMP3(AudacityProject *project,
               bool stereo, wxString fName,
               bool selectionOnly, double t0, double t1);

#endif

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// version control system. Please do not modify past this point.
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