ProjectRate.cpp

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/*!********************************************************************
 
Audacity: A Digital Audio Editor
 
@file ProjectRate.cpp
 
Paul Licameli split from ProjectSettings.cpp
 
**********************************************************************/
 
#include "ProjectRate.h"
 
#include "AudioIOBase.h"
#include "Prefs.h"
#include "Project.h"
#include "QualitySettings.h"
#include "XMLWriter.h"
#include "XMLAttributeValueView.h"
 
static const AudacityProject::AttachedObjects::RegisteredFactory
sKey{
  []( AudacityProject &project ){
     auto result = std::make_shared< ProjectRate >(project);
     return result;
   }
};
 
ProjectRate &ProjectRate::Get( AudacityProject &project )
{
   return project.AttachedObjects::Get< ProjectRate >( sKey );
}
 
const ProjectRate &ProjectRate::Get( const AudacityProject &project )
{
   return Get( const_cast< AudacityProject & >( project ) );
}
 
ProjectRate::ProjectRate(AudacityProject &project)
{
   int intRate = 0;
   bool wasDefined = QualitySettings::DefaultSampleRate.Read( &intRate );
   mRate = intRate;
   if ( !wasDefined ) {
      // The default given above can vary with host/devices. So unless there is
      // an entry for the default sample rate in audacity.cfg, Audacity can open
      // with a rate which is different from the rate with which it closed.
      // See bug 1879.
      QualitySettings::DefaultSampleRate.Write( mRate );
      gPrefs->Flush();
   }
}
 
double ProjectRate::GetRate() const
{
   return mRate;
}
 
void ProjectRate::SetRate(double rate)
{
   if (rate != mRate) {
      mRate = rate;
      Publish(rate);
   }
}
 
static ProjectFileIORegistry::AttributeWriterEntry entry {
[](const AudacityProject &project, XMLWriter &xmlFile){
   xmlFile.WriteAttr(wxT("rate"), ProjectRate::Get(project).GetRate());
}
};
 
static ProjectFileIORegistry::AttributeReaderEntries entries {
// Just a pointer to function, but needing overload resolution as non-const:
(ProjectRate& (*)(AudacityProject &)) &ProjectRate::Get, {
   { "rate", [](auto &settings, auto value){
      double rate = value.Get(settings.GetRate());
      settings.SetRate( rate );
   } },
} };