Channel.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  Channel.cpp
 
  Dominic Mazzoni
 
  Paul Licameli split from Track.h
 
*//*******************************************************************/
#include "Channel.h"
 
#include <algorithm>
#include <numeric>
 
ChannelGroupInterval::~ChannelGroupInterval() = default;
 
ChannelInterval::~ChannelInterval() = default;
 
WideChannelGroupInterval::~WideChannelGroupInterval() = default;
 
Channel::~Channel() = default;
 
size_t Channel::GetChannelIndex() const
{
   auto &group = DoGetChannelGroup();
   int index = -1;
   for (size_t ii = 0, nn = group.NChannels(); ii < nn; ++ii)
      if (group.GetChannel(ii).get() == this) {
         index = ii;
         break;
      }
   assert(index >= 0);
   return index;
}
 
const ChannelGroup &Channel::GetChannelGroup() const
{
   return DoGetChannelGroup();
}
 
ChannelGroup &Channel::GetChannelGroup()
{
   return DoGetChannelGroup();
}
 
ChannelGroup::~ChannelGroup() = default;
 
double ChannelGroup::GetStartTime() const
{
   const auto &range = Intervals();
   if (range.empty())
      return 0;
   return std::accumulate(range.first, range.second,
      std::numeric_limits<double>::max(),
      [](double acc, const auto &pInterval){
         return std::min(acc, pInterval->Start()); });
}
 
double ChannelGroup::GetEndTime() const
{
   const auto &range = Intervals();
   if (range.empty())
      return 0;
   return std::accumulate(range.first, range.second,
      std::numeric_limits<double>::lowest(),
      [](double acc, const auto &pInterval){
         return std::max(acc, pInterval->End()); });
}