ExportPluginHelpers.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  ExportPluginHelpers.h
 
  Dominic Mazzoni
 
  Vitaly Sverchinsky split from ExportPlugin.h
 
**********************************************************************/
 
#pragma once
 
#include <memory>
 
#include "ExportPlugin.h"
#include "ExportTypes.h"
#include "SampleFormat.h"
 
class TrackList;
class WaveTrack;
class Mixer;
 
namespace MixerOptions
{
class Downmix;
}
 
class IMPORT_EXPORT_API ExportPluginHelpers final 
{
public:
 
   static std::unique_ptr<Mixer> CreateMixer(const TrackList &tracks,
         bool selectionOnly,
         double startTime, double stopTime,
         unsigned numOutChannels, size_t outBufferSize, bool outInterleaved,
         double outRate, sampleFormat outFormat,
         MixerOptions::Downmix *mixerSpec);
 
   static ExportResult UpdateProgress(ExportProcessorDelegate& delegate, Mixer& mixer, double t0, double t1);
 
   template<typename T>
   static T GetParameterValue(const ExportProcessor::Parameters& parameters, int id, T defaultValue = T())
   {
      auto it = std::find_if(
         parameters.begin(),
         parameters.end(),
         [=](const auto& t) { return std::get<0>(t) == id; });
      if(it != parameters.end())
      {
         if(auto value = std::get_if<T>(&std::get<1>(*it)))
            return *value;
      }
      return defaultValue;
   }
};