silentblockfile.cpp

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

  SilentBlockFile.cpp

  Joshua Haberman

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

#include "SilentBlockFile.h"
#include "../FileFormats.h"

SilentBlockFile::SilentBlockFile(sampleCount sampleLen):
   BlockFile(wxFileName(), sampleLen)
{
}

SilentBlockFile::~SilentBlockFile()
{
}

bool SilentBlockFile::ReadSummary(void *data)
{
   memset(data, 0, (size_t)mSummaryInfo.totalSummaryBytes);
   return true;
}

int SilentBlockFile::ReadData(samplePtr data, sampleFormat format,
                              sampleCount start, sampleCount len)
{
   ClearSamples(data, format, 0, len);

   return len;
}

void SilentBlockFile::SaveXML(int depth, wxFFile &xmlFile)
{
   for(int i = 0; i < depth; i++)
      xmlFile.Write(wxT("\t"));
   xmlFile.Write(wxT("<silentblockfile "));
   xmlFile.Write(wxString::Format(wxT("len='%d' "), mLen));
   xmlFile.Write(wxT("/>\n"));
}

/// static
BlockFile *SilentBlockFile::BuildFromXML(DirManager &dm, const wxChar **attrs)
{
   sampleCount len = 0;

   while(*attrs)
   {
       const wxChar *attr =  *attrs++;
       const wxChar *value = *attrs++;

       if( !wxStrcmp(attr, wxT("len")) )
          len = wxAtoi(value);
   }

   return new SilentBlockFile(len);
}

/// Create a copy of this BlockFile
BlockFile *SilentBlockFile::Copy(wxFileName newFileName)
{
   BlockFile *newBlockFile = new SilentBlockFile(mLen);

   return newBlockFile;
}

int SilentBlockFile::GetSpaceUsage()
{
   return 0;
}


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