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Getting to the bottom of those 'off by one' samples, some unavoidable (see bugzilla 123 http://bugzilla.audacityteam.org/show_bug.cgi?id=123#c27)

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Also getting more experience of those mT1-mT0 problems.
This commit is contained in:
martynshaw99 2010-09-05 23:29:53 +00:00
parent f86dca89fc
commit 5f2252a5b9
1 changed files with 15 additions and 2 deletions
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17
src/effects/DtmfGen.cpp
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@ -62,7 +62,13 @@ bool EffectDtmf::Init()
if (mT1 > mT0) {
// there is a selection: let's fit in there...
mDuration = mT1 - mT0;
// MJS: note that this is just for the TTC and is independent of the track rate
// but we do need to make sure we have the right number of samples at the project rate
AudacityProject *p = GetActiveProject();
double projRate = p->GetRate();
double quantMT0 = (double)((sampleCount)floor(mT0 * projRate + 0.5))/projRate;
double quantMT1 = (double)((sampleCount)floor(mT1 * projRate + 0.5))/projRate;
mDuration = quantMT1 - quantMT0;
mIsSelection = true;
} else {
// retrieve last used values
@ -254,7 +260,14 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
bool bGoodResult = true;
// all dtmf sequence durations in samples from seconds
numSamplesSequence = tmp->TimeToLongSamples(mDuration); // needs to be exact number of samples selected
// MJS: Note that mDuration is in seconds but will have been quantised to the units of the TTC.
// If this was 'samples' and the project rate was lower than the track rate,
// extra samples may get created as mDuration may now be > mT1 - mT0;
// However we are making our best efforts at creating what was asked for.
sampleCount nT0 = tmp->TimeToLongSamples(mT0);
sampleCount nT1 = tmp->TimeToLongSamples(mT0 + mDuration);
numSamplesSequence = nT1 - nT0; // needs to be exact number of samples selected
//make under-estimates if anything, and then redistribute the few remaining samples
numSamplesTone = (sampleCount)floor(dtmfTone * track.GetRate());
numSamplesSilence = (sampleCount)floor(dtmfSilence * track.GetRate());