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Make sure the envelope buffer is completely set

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This should correct at least one of the situations where
folks have complained about crackling when the first clip
of the first track does not start at zero.
This commit is contained in:
lllucius 2014-12-22 05:03:08 +00:00
parent 86a71bd71b
commit 65088dc4d2
1 changed files with 15 additions and 7 deletions
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22
src/WaveTrack.cpp
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@ -1851,16 +1851,24 @@ void WaveTrack::GetEnvelopeValues(double *buffer, int bufferLen,
if( bufferLen <= 0 )
return;
// This is useful in debugging, to easily find null envelope settings, but
// should not be necessary in Release build.
// If we were going to set it to failsafe values in Release build, better to set each element to 1.0.
#ifdef __WXDEBUG__
memset(buffer, 0, sizeof(double)*bufferLen);
#endif
// The output buffer corresponds to an unbroken span of time which the callers expect
// to be fully valid. As clips are processed below, the output buffer is updated with
// envelope values from any portion of a clip, start, end, middle, or none at all.
// 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
// 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.
for (int i = 0; i < bufferLen; i++)
{
buffer[i] = 1.0;
}
double startTime = t0;
double endTime = t0+tstep*bufferLen;
bool processed = false;
for (WaveClipList::compatibility_iterator it=GetClipIterator(); it; it=it->GetNext())
{
WaveClip *clip = it->GetData();