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Improve rendering and drawing of envelope with discontinuity

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Change the drawing of wave track envelope at high zoom...
  Change evaluation of envelope near discontinuities...
  Prefer "sampleDur" to "sampleTime" for some variable names
This commit is contained in:
Paul Licameli 2017-05-26 14:53:32 -04:00
commit a4cc9a9e3b
7 changed files with 111 additions and 52 deletions
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110
src/Envelope.cpp
View File

@ -606,7 +606,7 @@ bool EnvelopeEditor::MouseEvent(const wxMouseEvent & event, wxRect & r,
return false;
}
void Envelope::CollapseRegion( double t0, double t1, double sampleTime )
void Envelope::CollapseRegion( double t0, double t1, double sampleDur )
// NOFAIL-GUARANTEE
{
// This gets called when somebody clears samples.
@ -615,7 +615,7 @@ void Envelope::CollapseRegion( double t0, double t1, double sampleTime )
// For the boundaries of the interval, preserve the left-side limit at the
// start and right-side limit at the end.
const auto epsilon = sampleTime / 2;
const auto epsilon = sampleDur / 2;
t0 = std::max( 0.0, std::min( mTrackLen, t0 - mOffset ) );
t1 = std::max( 0.0, std::min( mTrackLen, t1 - mOffset ) );
@ -983,28 +983,15 @@ void Envelope::GetPoints(double *bufferWhen,
}
}
void Envelope::Cap( double sampleTime )
void Envelope::Cap( double sampleDur )
{
auto range = EqualRange( mTrackLen, sampleTime );
auto range = EqualRange( mTrackLen, sampleDur );
if ( range.first == range.second )
InsertOrReplaceRelative( mTrackLen, GetValueRelative( mTrackLen ) );
}
// Private methods
// We no longer tolerate multiple envelope control points at the exact
// same t; the behavior can be well-defined, but it is still incorrect
// in that it vastly complicates paste operations behaving as a user
// reasonably expects. The most common problem occurs pasting an
// envelope into another track; the boundary behavior causes the
// t=insert_point envelope level of the insertee to apply to sample 0
// of the inserted sample, causing a pop. This most visibly manifests
// itself in undo and mixing when a v=1.0 sample magically shows
// up at boundaries causing a pop.
// Although this renders the name a slight misnomer, a duplicate
// 'replaces' the current control point.
/** @brief Add a control point to the envelope
*
* @param when the time in seconds when the envelope point should be created.
@ -1061,13 +1048,13 @@ int Envelope::InsertOrReplaceRelative(double when, double value)
return i;
}
std::pair<int, int> Envelope::EqualRange( double when, double sampleTime ) const
std::pair<int, int> Envelope::EqualRange( double when, double sampleDur ) const
{
// Find range of envelope points matching the given time coordinate
// (within an interval of length sampleTime)
// (within an interval of length sampleDur)
// by binary search; if empty, it still indicates where to
// insert.
const auto tolerance = sampleTime / 2;
const auto tolerance = sampleDur / 2;
auto begin = mEnv.begin();
auto end = mEnv.end();
auto first = std::lower_bound(
@ -1090,11 +1077,11 @@ void Envelope::SetOffset(double newOffset)
mOffset = newOffset;
}
void Envelope::SetTrackLen( double trackLen, double sampleTime )
void Envelope::SetTrackLen( double trackLen, double sampleDur )
// NOFAIL-GUARANTEE
{
// Preserve the left-side limit at trackLen.
auto range = EqualRange( trackLen, sampleTime );
auto range = EqualRange( trackLen, sampleDur );
bool needPoint = ( range.first == range.second && trackLen < mTrackLen );
double value;
if ( needPoint )
@ -1127,12 +1114,12 @@ void Envelope::RescaleTimes( double newLength )
}
// Accessors
double Envelope::GetValue(double t) const
double Envelope::GetValue( double t, double sampleDur ) const
{
// t is absolute time
double temp;
GetValues(&temp, 1, t, 1.0);
GetValues( &temp, 1, t, sampleDur );
return temp;
}
@ -1140,7 +1127,7 @@ double Envelope::GetValueRelative(double t) const
{
double temp;
GetValuesRelative(&temp, 1, t, 1.0);
GetValuesRelative(&temp, 1, t, 0.0);
return temp;
}
@ -1219,9 +1206,14 @@ void Envelope::GetValuesRelative(double *buffer, int bufferLen,
// JC: If bufferLen ==0 we have probably just allocated a zero sized buffer.
// wxASSERT( bufferLen > 0 );
const auto epsilon = tstep / 2;
int len = mEnv.size();
double t = t0;
double increment = 0;
if ( len > 0 && t <= mEnv[0].GetT() && mEnv[0].GetT() == mEnv[1].GetT() )
increment = epsilon;
double tprev, vprev, tnext = 0, vnext, vstep = 0;
for (int b = 0; b < bufferLen; b++) {
@ -1233,20 +1225,24 @@ void Envelope::GetValuesRelative(double *buffer, int bufferLen,
t += tstep;
continue;
}
auto tplus = t + increment;
// IF before envelope THEN first value
if (t <= mEnv[0].GetT()) {
if ( tplus <= mEnv[0].GetT() ) {
buffer[b] = mEnv[0].GetVal();
t += tstep;
continue;
}
// IF after envelope THEN last value
if (t >= mEnv[len - 1].GetT()) {
if ( tplus >= mEnv[len - 1].GetT() ) {
buffer[b] = mEnv[len - 1].GetVal();
t += tstep;
continue;
}
if (b == 0 || t > tnext) {
// Note >= not > , to get the right limit in case epsilon == 0
if ( b == 0 || tplus >= tnext ) {
// We're beyond our tnext, so find the next one.
// Don't just increment lo or hi because we might
@ -1254,12 +1250,23 @@ void Envelope::GetValuesRelative(double *buffer, int bufferLen,
// points to move over. That's why we binary search.
int lo,hi;
BinarySearchForTime( lo, hi, t );
// mEnv[0] is before t because of eliminations above, therefore lo >= 0
// mEnv[len - 1] is after t, therefore hi <= len - 1
BinarySearchForTime( lo, hi, tplus );
// mEnv[0] is before tplus because of eliminations above, therefore lo >= 0
// mEnv[len - 1] is after tplus, therefore hi <= len - 1
tprev = mEnv[lo].GetT();
tnext = mEnv[hi].GetT();
if ( hi + 1 < len && tnext == mEnv[ hi + 1 ].GetT() )
// There is a discontinuity after this point-to-point interval.
// Will stop evaluating in this interval when time is slightly
// before tNext, then use the right limit. This is the right intent
// in case small roundoff errors cause a sample time to be a little
// before the envelope point time.
increment = epsilon;
else
increment = 0;
vprev = GetInterpolationStartValueAtPoint( lo );
vnext = GetInterpolationStartValueAtPoint( hi );
@ -1299,10 +1306,45 @@ void Envelope::GetValuesRelative(double *buffer, int bufferLen,
}
void Envelope::GetValues
(double *buffer, int bufferLen, int leftOffset, const ZoomInfo &zoomInfo) const
( double alignedTime, double sampleDur,
double *buffer, int bufferLen, int leftOffset,
const ZoomInfo &zoomInfo )
const
{
for (int xx = 0; xx < bufferLen; ++xx)
buffer[xx] = GetValue(zoomInfo.PositionToTime(xx, -leftOffset));
// Getting many envelope values, corresponding to pixel columns, which may
// not be uniformly spaced in time when there is a fisheye.
double prevDiscreteTime, prevSampleVal, nextSampleVal;
for ( int xx = 0; xx < bufferLen; ++xx ) {
auto time = zoomInfo.PositionToTime( xx, -leftOffset );
if ( sampleDur <= 0 )
// Sample interval not defined (as for time track)
buffer[xx] = GetValue( time );
else {
// The level of zoom-in may resolve individual samples.
// If so, then instead of evaluating the envelope directly,
// we draw a piecewise curve with knees at each sample time.
// This actually makes clearer what happens as you drag envelope
// points and make discontinuities.
auto leftDiscreteTime = alignedTime +
sampleDur * floor( ( time - alignedTime ) / sampleDur );
if ( xx == 0 || leftDiscreteTime != prevDiscreteTime ) {
prevDiscreteTime = leftDiscreteTime;
prevSampleVal =
GetValue( prevDiscreteTime, sampleDur );
nextSampleVal =
GetValue( prevDiscreteTime + sampleDur, sampleDur );
}
auto ratio = ( time - leftDiscreteTime ) / sampleDur;
if ( GetExponential() )
buffer[ xx ] = exp(
( 1.0 - ratio ) * log( prevSampleVal )
+ ratio * log( nextSampleVal ) );
else
buffer[ xx ] =
( 1.0 - ratio ) * prevSampleVal + ratio * nextSampleVal;
}
}
}
// relative time

19
src/Envelope.h
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@ -118,9 +118,9 @@ public:
float zoomMin, float zoomMax, bool mirrored) const;
// Handling Cut/Copy/Paste events
// sampleTime determines when the endpoint of the collapse is near enough
// sampleDur determines when the endpoint of the collapse is near enough
// to an endpoint of the domain, that an extra control point is not needed.
void CollapseRegion(double t0, double t1, double sampleTime);
void CollapseRegion(double t0, double t1, double sampleDur);
void Paste(double t0, const Envelope *e);
void InsertSpace(double t0, double tlen);
@ -128,13 +128,13 @@ public:
// Control
void SetOffset(double newOffset);
void SetTrackLen( double trackLen, double sampleTime = 0.0 );
void SetTrackLen( double trackLen, double sampleDur = 0.0 );
void RescaleValues(double minValue, double maxValue);
void RescaleTimes( double newLength );
// Accessors
/** \brief Get envelope value at time t */
double GetValue(double t) const;
double GetValue( double t, double sampleDur = 0 ) const;
/** \brief Get many envelope points at once.
*
@ -142,13 +142,16 @@ public:
* more than one value in a row. */
void GetValues(double *buffer, int len, double t0, double tstep) const;
/** \brief Get many envelope points at once, but don't assume uniform time step.
/** \brief Get many envelope points for pixel columns at once,
* but don't assume uniform time per pixel.
*/
void GetValues
(double *buffer, int bufferLen, int leftOffset, const ZoomInfo &zoomInfo) const;
( double aligned_time, double sampleDur,
double *buffer, int bufferLen, int leftOffset,
const ZoomInfo &zoomInfo) const;
// Guarantee an envelope point at the end of the domain.
void Cap( double sampleTime );
void Cap( double sampleDur );
private:
double GetValueRelative(double t) const;
@ -198,7 +201,7 @@ private:
return mEnv[index];
}
std::pair<int, int> EqualRange( double when, double sampleTime ) const;
std::pair<int, int> EqualRange( double when, double sampleDur ) const;
public:
/** \brief Returns the sets of when and value pairs */

3
src/TimeTrack.cpp
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@ -281,7 +281,8 @@ void TimeTrack::Draw(wxDC & dc, const wxRect & r, const ZoomInfo &zoomInfo) cons
mRuler->Draw(dc, this);
Doubles envValues{ size_t(mid.width) };
GetEnvelope()->GetValues(envValues.get(), mid.width, 0, zoomInfo);
GetEnvelope()->GetValues
( 0, 0, envValues.get(), mid.width, 0, zoomInfo );
dc.SetPen(AColor::envelopePen);

11
src/TrackArtist.cpp
View File

@ -1352,7 +1352,10 @@ void TrackArtist::DrawIndividualSamples(wxDC &dc, int leftOffset, const wxRect &
(int)(zoomInfo.TimeToPosition(time, -leftOffset))));
xpos[s] = xx;
const double tt = buffer[s] * clip->GetEnvelope()->GetValue(time);
// Calculate sample as it would be rendered, so quantize time
double value =
clip->GetEnvelope()->GetValue( time, 1.0 / clip->GetRate() );
const double tt = buffer[s] * value;
if (clipped && mShowClipping && ((tt <= -MAX_AUDIO) || (tt >= MAX_AUDIO)))
clipped[clipcnt++] = xx;
@ -1778,7 +1781,8 @@ void TrackArtist::DrawClipWaveform(const WaveTrack *track,
std::vector<double> vEnv(mid.width);
double *const env = &vEnv[0];
clip->GetEnvelope()->GetValues(env, mid.width, leftOffset, zoomInfo);
clip->GetEnvelope()->GetValues
( tOffset, 1.0 / rate, env, mid.width, leftOffset, zoomInfo );
// Draw the background of the track, outlining the shape of
// the envelope and using a colored pen for the selected
@ -1909,7 +1913,8 @@ void TrackArtist::DrawClipWaveform(const WaveTrack *track,
if (!showIndividualSamples) {
std::vector<double> vEnv2(rect.width);
double *const env2 = &vEnv2[0];
clip->GetEnvelope()->GetValues(env2, rect.width, leftOffset, zoomInfo);
clip->GetEnvelope()->GetValues
( tOffset, 1.0 / rate, env2, rect.width, leftOffset, zoomInfo );
DrawMinMaxRMS(dc, rect, env2,
zoomMin, zoomMax,
dB, dBRange,

8
src/TrackPanel.cpp
View File

@ -4625,7 +4625,8 @@ float TrackPanel::FindSampleEditingLevel(wxMouseEvent &event, double dBRange, do
Envelope *const env = mDrawingTrack->GetEnvelopeAtX(event.m_x);
if (env)
{
double envValue = env->GetValue(t0);
// Calculate sample as it would be rendered, so quantize time
double envValue = env->GetValue( t0, 1.0 / mDrawingTrack->GetRate() );
if (envValue > 0)
newLevel /= envValue;
else
@ -6904,7 +6905,7 @@ bool TrackPanel::HitTestEnvelope(Track *track, const wxRect &rect, const wxMouse
// Get envelope point, range 0.0 to 1.0
const bool dB = !wavetrack->GetWaveformSettings().isLinear();
// Convert x to time.
const double envValue = envelope->GetValue(mViewInfo->PositionToTime(event.m_x, rect.x));
float zoomMin, zoomMax;
@ -6992,7 +6993,8 @@ bool TrackPanel::HitTestSamples(Track *track, const wxRect &rect, const wxMouseE
double envValue = 1.0;
Envelope* env = wavetrack->GetEnvelopeAtX(event.GetX());
if (env)
envValue = env->GetValue(tt);
// Calculate sample as it would be rendered, so quantize time
envValue = env->GetValue( tt, 1.0 / wavetrack->GetRate() );
int yValue = GetWaveYPos( oneSample * envValue,
zoomMin, zoomMax,

4
src/WaveTrack.cpp
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@ -2130,7 +2130,7 @@ void WaveTrack::GetEnvelopeValues(double *buffer, size_t bufferLen,
// Since this does not guarantee that the entire buffer is filled with values we need
// to initialize the entire buffer to a default value.
//
// This does mean that, in the cases where a usuable clip is located, the buffer value will
// This does mean that, in the cases where a usable clip is located, the buffer value will
// be set twice. Unfortunately, there is no easy way around this since the clips are not
// stored in increasing time order. If they were, we could just track the time as the
// buffer is filled.
@ -2180,6 +2180,8 @@ void WaveTrack::GetEnvelopeValues(double *buffer, size_t bufferLen,
rlen = limitSampleBufferSize( rlen, nClipLen );
rlen = std::min(rlen, size_t(floor(0.5 + (dClipEndTime - rt0) / tstep)));
}
// Samples are obtained for the purpose of rendering a wave track,
// so quantize time
clip->GetEnvelope()->GetValues(rbuf, rlen, rt0, tstep);
}
}

4
src/WaveTrack.h
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@ -259,8 +259,12 @@ class AUDACITY_DLL_API WaveTrack final : public PlayableTrack {
fillFormat fill = fillZero, bool mayThrow = true) const;
void Set(samplePtr buffer, sampleFormat format,
sampleCount start, size_t len);
// Fetch envelope values corresponding to uniformly separated sample times
// starting at the given time.
void GetEnvelopeValues(double *buffer, size_t bufferLen,
double t0) const;
std::pair<float, float> GetMinMax(
double t0, double t1, bool mayThrow = true) const;
float GetRMS(double t0, double t1, bool mayThrow = true) const;