bool WebMBufferedState::GetStartTime(uint64_t *aTime)
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (mTimeMapping.IsEmpty()) {
return false;
}
uint32_t idx = mTimeMapping.IndexOfFirstElementGt(0, SyncOffsetComparator());
if (idx == mTimeMapping.Length()) {
return false;
}
*aTime = mTimeMapping[idx].mTimecode;
return true;
}
bool
WebMBufferedState::GetNextKeyframeTime(uint64_t aTime, uint64_t* aKeyframeTime)
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
int64_t offset = 0;
bool rv = GetOffsetForTime(aTime, &offset);
if (!rv) {
return false;
}
uint32_t idx = mTimeMapping.IndexOfFirstElementGt(offset, SyncOffsetComparator());
if (idx == mTimeMapping.Length()) {
return false;
}
*aKeyframeTime = mTimeMapping[idx].mTimecode;
return true;
}
bool WebMBufferedState::CalculateBufferedForRange(int64_t aStartOffset, int64_t aEndOffset,
uint64_t* aStartTime, uint64_t* aEndTime)
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
// Find the first WebMTimeDataOffset at or after aStartOffset.
uint32_t start = mTimeMapping.IndexOfFirstElementGt(aStartOffset - 1, SyncOffsetComparator());
if (start == mTimeMapping.Length()) {
return false;
}
// Find the first WebMTimeDataOffset at or before aEndOffset.
uint32_t end = mTimeMapping.IndexOfFirstElementGt(aEndOffset);
if (end > 0) {
end -= 1;
}
// Range is empty.
if (end <= start) {
return false;
}
NS_ASSERTION(mTimeMapping[start].mSyncOffset >= aStartOffset &&
mTimeMapping[end].mEndOffset <= aEndOffset,
"Computed time range must lie within data range.");
if (start > 0) {
NS_ASSERTION(mTimeMapping[start - 1].mSyncOffset < aStartOffset,
"Must have found least WebMTimeDataOffset for start");
}
if (end < mTimeMapping.Length() - 1) {
NS_ASSERTION(mTimeMapping[end + 1].mEndOffset > aEndOffset,
"Must have found greatest WebMTimeDataOffset for end");
}
MOZ_ASSERT(mTimeMapping[end].mTimecode >= mTimeMapping[end - 1].mTimecode);
uint64_t frameDuration = mTimeMapping[end].mTimecode - mTimeMapping[end - 1].mTimecode;
*aStartTime = mTimeMapping[start].mTimecode;
*aEndTime = mTimeMapping[end].mTimecode + frameDuration;
return true;
}
