Method PlayPlayRegion

src/ProjectAudioManager.cpp:293–469

}

int ProjectAudioManager::PlayPlayRegion(const SelectedRegion &selectedRegion,
                                   const AudioIOStartStreamOptions &options,
                                   PlayMode mode,
                                   bool backwards /* = false */)
{
   auto &projectAudioManager = *this;
   bool canStop = projectAudioManager.CanStopAudioStream();

   if ( !canStop )
      return -1;

   auto &pStartTime = options.pStartTime;

   bool nonWaveToo = options.playNonWaveTracks;

   // Uncomment this for laughs!
   // backwards = true;

   double t0 = selectedRegion.t0();
   double t1 = selectedRegion.t1();
   // SelectedRegion guarantees t0 <= t1, so we need another boolean argument
   // to indicate backwards play.
   const bool newDefault = (mode == PlayMode::loopedPlay);

   if (backwards)
      std::swap(t0, t1);

   projectAudioManager.SetLooping( mode == PlayMode::loopedPlay );
   projectAudioManager.SetCutting( mode == PlayMode::cutPreviewPlay );

   bool success = false;

   auto gAudioIO = AudioIO::Get();
   if (gAudioIO->IsBusy())
      return -1;

   const bool cutpreview = mode == PlayMode::cutPreviewPlay;
   if (cutpreview && t0==t1)
      return -1; /* msmeyer: makes no sense */

   AudacityProject *p = &mProject;

   auto &tracks = TrackList::Get(*p);

   mLastPlayMode = mode;

   bool hasaudio;
   if (nonWaveToo)
      hasaudio = ! tracks.Any<PlayableTrack>().empty();
   else
      hasaudio = ! tracks.Any<WaveTrack>().empty();

   double latestEnd = tracks.GetEndTime();

   if (!hasaudio)
      return -1;  // No need to continue without audio tracks

#if defined(EXPERIMENTAL_SEEK_BEHIND_CURSOR)