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Generate the right number of samples of audio, redistributing any 'spare' samples amongst the marks and spaces.

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This commit is contained in:
martynshaw99 2010-04-17 23:26:12 +00:00
parent fad5cd7f96
commit c6ad77aabe
1 changed files with 12 additions and 11 deletions
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23
src/effects/DtmfGen.cpp
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@ -254,18 +254,19 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
bool bGoodResult = true;
// all dtmf sequence durations in samples from seconds
numSamplesSequence = (sampleCount)(mDuration * track.GetRate() + 0.5);
numSamplesTone = (sampleCount)(dtmfTone * track.GetRate() + 0.5);
numSamplesSilence = (sampleCount)(dtmfSilence * track.GetRate() + 0.5);
numSamplesSequence = tmp->TimeToLongSamples(mDuration); // 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());
// recalculate the sum, and spread the difference - due to approximations.
// Since diff should be in the order of "some" samples, a division (resulting in zero)
// is not sufficient, so we add the additional remaining samples in each tone/silence block,
// at least until available.
int diff = numSamplesSequence - (dtmfNTones*numSamplesTone) - (dtmfNTones-1)*numSamplesSilence;
if (diff>dtmfNTones) {
// in this case, both these values would change, so it makes sense to recalculate diff
// otherwise just keep the value we already have
while (diff > 2*dtmfNTones - 1) { // more than one per thingToBeGenerated
// in this case, both numSamplesTone and numSamplesSilence would change, so it makes sense
// to recalculate diff here, otherwise just keep the value we already have
// should always be the case that dtmfNTones>1, as if 0, we don't even start processing,
// and with 1 there is no difference to spread (no silence slot)...
@ -274,6 +275,8 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
numSamplesSilence += (diff/(dtmfNTones-1));
diff = numSamplesSequence - (dtmfNTones*numSamplesTone) - (dtmfNTones-1)*numSamplesSilence;
}
wxASSERT(diff >= 0); // should never be negative
// this var will be used as extra samples distributor
int extra=0;
@ -303,8 +306,7 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
//
while ((i < numSamplesSequence) && bGoodResult) {
if (isTone)
// generate tone
{
{ // generate tone
// the statement takes care of extracting one sample from the diff bin and
// adding it into the tone block until depletion
extra=(diff-- > 0?1:0);
@ -325,8 +327,7 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
if(n>=dtmfNTones)break;
}
else
// generate silence
{
{ // generate silence
// the statement takes care of extracting one sample from the diff bin and
// adding it into the silence block until depletion
extra=(diff-- > 0?1:0);
@ -348,7 +349,7 @@ bool EffectDtmf::GenerateTrack(WaveTrack *tmp,
isTone=!isTone;
} // finished the whole dtmf sequence
wxLogDebug(wxT("Extra %d diff: %d"), extra, diff);
delete[] data;
return bGoodResult;
}