avtVector avtStateRecorderIntegralCurve::GetEndPoint()
{
if( GetNumberOfSamples() )
return GetSample( GetNumberOfSamples() - 1 ).position;
else
return ivp->GetCurrentY();
}
double avtStateRecorderIntegralCurve::GetDistance()
{
if( GetNumberOfSamples() )
return GetSample( GetNumberOfSamples() - 1 ).arclength;
else
return distance;
}
double avtStateRecorderIntegralCurve::GetTime()
{
if( GetNumberOfSamples() )
return GetSample( GetNumberOfSamples() - 1 ).time;
else
return time;
}
u_int64_t MP4Track::GetTotalOfSampleSizes()
{
u_int32_t fixedSampleSize =
m_pStszFixedSampleSizeProperty->GetValue();
// if fixed sample size, just need to multiply by number of samples
if (fixedSampleSize != 0) {
return fixedSampleSize * GetNumberOfSamples();
}
// else non-fixed sample size, sum them
u_int64_t totalSampleSizes = 0;
u_int32_t numSamples = m_pStszSampleSizeProperty->GetCount();
for (MP4SampleId sid = 1; sid <= numSamples; sid++) {
u_int32_t sampleSize =
m_pStszSampleSizeProperty->GetValue(sid - 1);
totalSampleSizes += sampleSize;
}
return totalSampleSizes;
}
u_int32_t MP4Track::GetMaxBitrate()
{
u_int32_t timeScale = GetTimeScale();
MP4SampleId numSamples = GetNumberOfSamples();
u_int32_t maxBytesPerSec = 0;
u_int32_t bytesThisSec = 0;
MP4Timestamp thisSec = 0;
for (MP4SampleId sid = 1; sid <= numSamples; sid++) {
u_int32_t sampleSize;
MP4Timestamp sampleTime;
sampleSize = GetSampleSize(sid);
GetSampleTimes(sid, &sampleTime, NULL);
// sample counts for current second
if (sampleTime < thisSec + timeScale) {
bytesThisSec += sampleSize;
} else { // sample is in a future second
if (bytesThisSec > maxBytesPerSec) {
maxBytesPerSec = bytesThisSec;
}
thisSec = sampleTime - (sampleTime % timeScale);
bytesThisSec = sampleSize;
}
}
// last second (or partial second)
if (bytesThisSec > maxBytesPerSec) {
maxBytesPerSec = bytesThisSec;
}
return maxBytesPerSec * 8;
}
void MP4Track::SetSampleRenderingOffset(MP4SampleId sampleId,
MP4Duration renderingOffset)
{
// check if any ctts entries exist
if (m_pCttsCountProperty == NULL
|| m_pCttsCountProperty->GetValue() == 0) {
// if not then Update routine can be used
// to create a ctts entry for samples before this one
// and a ctts entry for this sample
UpdateRenderingOffsets(sampleId, renderingOffset);
// but we also need a ctts entry
// for all samples after this one
u_int32_t afterSamples = GetNumberOfSamples() - sampleId;
if (afterSamples) {
m_pCttsSampleCountProperty->AddValue(afterSamples);
m_pCttsSampleOffsetProperty->AddValue(0);
m_pCttsCountProperty->IncrementValue();;
}
return;
}
MP4SampleId firstSampleId;
u_int32_t cttsIndex = GetSampleCttsIndex(sampleId, &firstSampleId);
// do nothing in the degenerate case
if (renderingOffset ==
m_pCttsSampleOffsetProperty->GetValue(cttsIndex)) {
return;
}
u_int32_t sampleCount =
m_pCttsSampleCountProperty->GetValue(cttsIndex);
// if this sample has it's own ctts entry
if (sampleCount == 1) {
// then just set the value,
// note we don't attempt to collapse entries
m_pCttsSampleOffsetProperty->SetValue(renderingOffset, cttsIndex);
return;
}
MP4SampleId lastSampleId = firstSampleId + sampleCount - 1;
// else we share this entry with other samples
// we need to insert our own entry
if (sampleId == firstSampleId) {
// our sample is the first one
m_pCttsSampleCountProperty->
InsertValue(1, cttsIndex);
m_pCttsSampleOffsetProperty->
InsertValue(renderingOffset, cttsIndex);
m_pCttsSampleCountProperty->
SetValue(sampleCount - 1, cttsIndex + 1);
m_pCttsCountProperty->IncrementValue();
} else if (sampleId == lastSampleId) {
// our sample is the last one
m_pCttsSampleCountProperty->
InsertValue(1, cttsIndex + 1);
m_pCttsSampleOffsetProperty->
InsertValue(renderingOffset, cttsIndex + 1);
m_pCttsSampleCountProperty->
SetValue(sampleCount - 1, cttsIndex);
m_pCttsCountProperty->IncrementValue();
} else {
// our sample is in the middle, UGH!
// insert our new entry
m_pCttsSampleCountProperty->
InsertValue(1, cttsIndex + 1);
m_pCttsSampleOffsetProperty->
InsertValue(renderingOffset, cttsIndex + 1);
// adjust count of previous entry
m_pCttsSampleCountProperty->
SetValue(sampleId - firstSampleId, cttsIndex);
// insert new entry for those samples beyond our sample
m_pCttsSampleCountProperty->
InsertValue(lastSampleId - sampleId, cttsIndex + 2);
u_int32_t oldRenderingOffset =
m_pCttsSampleOffsetProperty->GetValue(cttsIndex);
m_pCttsSampleOffsetProperty->
InsertValue(oldRenderingOffset, cttsIndex + 2);
m_pCttsCountProperty->IncrementValue(2);
}
}
