TimeStretching Namespace Reference

Functions
WAVE_TRACK_API bool	HasPitchOrSpeed (const WaveTrack &track, double t0, double t1)
WAVE_TRACK_API void	WithClipRenderingProgress (std::function< void(const ProgressReporter &)> action, TranslatableString title=defaultStretchRenderingTitle)
WAVE_TRACK_API bool	SetClipStretchRatio (const WaveTrack &track, WaveTrack::Interval &interval, double stretchRatio)

Variables
WAVE_TRACK_API const TranslatableString	defaultStretchRenderingTitle

Function Documentation

HasPitchOrSpeed()

bool TimeStretching::HasPitchOrSpeed	(	const WaveTrack &	track,
		double	t0,
		double	t1
	)

Whether any clips, whose play regions intersect the interval, have non-unit stretch ratio

Definition at line 23 of file TimeStretching.cpp.

{
   auto clips = track.Intervals();
   return std::any_of(clips.begin(), clips.end(), [&](auto pClip) {
      return pClip->IntersectsPlayRegion(t0, t1) && pClip->HasPitchOrSpeed();
   });
}

References WaveTrack::Intervals().

Referenced by EffectOutputTracks::EffectOutputTracks(), EffectAmplify::Init(), EffectAutoDuck::Process(), and EffectRepair::Process().

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SetClipStretchRatio()

bool TimeStretching::SetClipStretchRatio	(	const WaveTrack &	track,
		WaveTrack::Interval &	interval,
		double	stretchRatio
	)

Definition at line 40 of file TimeStretching.cpp.

{
   const auto nextClip =
      track.GetNextInterval(interval, PlaybackDirection::forward);
   const auto maxEndTime = nextClip != nullptr ?
                              nextClip->Start() :
                              std::numeric_limits<double>::infinity();
 
   const auto start = interval.Start();
   const auto end = interval.End();
 
   const auto expectedEndTime =
      start + (end - start) * stretchRatio / interval.GetStretchRatio();
 
   if (expectedEndTime > maxEndTime)
      return false;
 
   interval.StretchRightTo(expectedEndTime);
   return true;
}

References WaveClip::End(), details::end(), forward, WaveTrack::GetNextInterval(), WaveClip::GetStretchRatio(), WaveClip::Start(), and WaveClip::StretchRightTo().

Referenced by ClipPitchAndSpeedButtonHandle::DoRelease(), and PitchAndSpeedDialog::SetClipSpeed().

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WithClipRenderingProgress()

void TimeStretching::WithClipRenderingProgress	(	std::function< void(const ProgressReporter &)>	action,
		TranslatableString	title = defaultStretchRenderingTitle
	)

Definition at line 32 of file TimeStretching.cpp.

{
   return UserException::WithCancellableProgress(move(action),
      std::move(title), XO("Rendering Clip"));
}

References title, UserException::WithCancellableProgress(), and XO().

Referenced by EffectOutputTracks::EffectOutputTracks(), anonymous_namespace{EditMenus.cpp}::OnJoin(), anonymous_namespace{LabelMenus.cpp}::OnJoinLabels(), WaveTrackAffordanceControls::OnRenderClipStretching(), and anonymous_namespace{EditMenus.cpp}::OnSilence().

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Variable Documentation

defaultStretchRenderingTitle

const TranslatableString TimeStretching::defaultStretchRenderingTitle

extern

Initial value:

=
   XO("Pre-processing")

---

Audacity: A Digital Audio Editor

TimeStretching.cpp

Paul Licameli

Definition at line 20 of file TimeStretching.cpp.

Referenced by EffectAutoDuck::Process().