DownmixSource.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  DownmixSource.h
 
*******************************************************************/
 
#pragma once
#include "MemoryX.h"
 
class WideSampleSequence;
 
namespace AudioGraph
{
   class Source;
}
 
class DownmixSource
{
public:
   DownmixSource() = default;
 
   virtual ~DownmixSource() = default;
   virtual AudioGraph::Source& GetDownstream() const = 0;
   virtual size_t NChannels() const = 0;
   virtual float GetChannelGain(size_t channel) const = 0;
   virtual void FindChannelFlags(unsigned char *channelFlags, size_t numChannels, size_t iChannel) = 0;
   virtual bool CanMakeMono() const = 0;
};
 
class SequenceDownmixSource final : public DownmixSource
{
   AudioGraph::Source& mDownstream;
   const WideSampleSequence& mSequence;
   const ArrayOf<bool> * mpMap {};
public:
 
   SequenceDownmixSource(AudioGraph::Source& downstream,
                         const WideSampleSequence& sequence,
                         const ArrayOf<bool> *channelMap);
 
   AudioGraph::Source& GetDownstream() const override;
   size_t NChannels() const override;
   float GetChannelGain(size_t channel) const override;
   void FindChannelFlags(unsigned char *channelFlags, size_t numChannels, size_t iChannel) override;
   bool CanMakeMono() const override;
};
 
class SimpleDonwmixSource final : public DownmixSource
{
   AudioGraph::Source& mDownstream;
   size_t mNChannels;
public:
 
   SimpleDonwmixSource(AudioGraph::Source& downstream, size_t channels);
 
   AudioGraph::Source& GetDownstream() const override;
   size_t NChannels() const override;
   float GetChannelGain(size_t channel) const override;
   void FindChannelFlags(unsigned char* channelFlags, size_t numChannels, size_t iChannel) override;
   bool CanMakeMono() const override;
};