void
AudioDestinationNode::SetIsOnlyNodeForContext(bool aIsOnlyNode)
{
if (!mStartedBlockingDueToBeingOnlyNode.IsNull() == aIsOnlyNode) {
// Nothing changed.
return;
}
if (!mStream) {
// DestroyMediaStream has been called, presumably during CC Unlink().
return;
}
if (mIsOffline) {
// Don't block the destination stream for offline AudioContexts, since
// we expect the zero data produced when there are no other nodes to
// show up in its result buffer. Also, we would get confused by adding
// ExtraCurrentTime before StartRendering has even been called.
return;
}
if (aIsOnlyNode) {
mStream->Suspend();
mStartedBlockingDueToBeingOnlyNode = TimeStamp::Now();
// Don't do an update of mExtraCurrentTimeSinceLastStartedBlocking until the next stable state.
mExtraCurrentTimeUpdatedSinceLastStableState = true;
ScheduleStableStateNotification();
} else {
// Force update of mExtraCurrentTimeSinceLastStartedBlocking if necessary
ExtraCurrentTime();
mStream->AdvanceAndResume(mExtraCurrentTimeSinceLastStartedBlocking);
mExtraCurrentTimeSinceLastStartedBlocking = 0;
mStartedBlockingDueToBeingOnlyNode = TimeStamp();
}
}
double
AudioDestinationNode::ExtraCurrentTime()
{
if (!mStartedBlockingDueToBeingOnlyNode.IsNull() &&
!mExtraCurrentTimeUpdatedSinceLastStableState) {
mExtraCurrentTimeUpdatedSinceLastStableState = true;
mExtraCurrentTimeSinceLastStartedBlocking =
(TimeStamp::Now() - mStartedBlockingDueToBeingOnlyNode).ToSeconds();
ScheduleStableStateNotification();
}
return mExtraCurrentTime + mExtraCurrentTimeSinceLastStartedBlocking;
}
StreamTime
AudioDestinationNode::ExtraCurrentTime()
{
if (!mStartedBlockingDueToBeingOnlyNode.IsNull() &&
!mExtraCurrentTimeUpdatedSinceLastStableState) {
mExtraCurrentTimeUpdatedSinceLastStableState = true;
// Round to nearest processing block.
double seconds =
(TimeStamp::Now() - mStartedBlockingDueToBeingOnlyNode).ToSeconds();
mExtraCurrentTimeSinceLastStartedBlocking = WEBAUDIO_BLOCK_SIZE *
StreamTime(seconds * Context()->SampleRate() / WEBAUDIO_BLOCK_SIZE + 0.5);
ScheduleStableStateNotification();
}
return mExtraCurrentTimeSinceLastStartedBlocking;
}
