bool
AudioNode::DisconnectFromParamIfConnected(AudioParam& aDestination, uint32_t aOutputIndex, uint32_t aInputIndex)
{
MOZ_ASSERT(aOutputIndex < mOutputParams.Length());
MOZ_ASSERT(aInputIndex < aDestination.InputNodes().Length());
const InputNode& input = aDestination.InputNodes()[aInputIndex];
if (input.mInputNode != this) {
return false;
}
aDestination.RemoveInputNode(aInputIndex);
// Remove one instance of 'dest' from mOutputParams. There could be
// others, and it's not correct to remove them all since some of them
// could be for different output ports.
mOutputParams.RemoveElementAt(aOutputIndex);
return true;
}
void
AudioNode::Disconnect(uint32_t aOutput, ErrorResult& aRv)
{
if (aOutput >= NumberOfOutputs()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
// An upstream node may be starting to play on the graph thread, and the
// engine for a downstream node may be sending a PlayingRefChangeHandler
// ADDREF message to this (main) thread. Wait for a round trip before
// releasing nodes, to give engines receiving sound now time to keep their
// nodes alive.
class RunnableRelease final : public nsRunnable
{
public:
explicit RunnableRelease(already_AddRefed<AudioNode> aNode)
: mNode(aNode) {}
NS_IMETHODIMP Run() override
{
mNode = nullptr;
return NS_OK;
}
private:
nsRefPtr<AudioNode> mNode;
};
for (int32_t i = mOutputNodes.Length() - 1; i >= 0; --i) {
AudioNode* dest = mOutputNodes[i];
for (int32_t j = dest->mInputNodes.Length() - 1; j >= 0; --j) {
InputNode& input = dest->mInputNodes[j];
if (input.mInputNode == this && input.mOutputPort == aOutput) {
// Destroying the InputNode here sends a message to the graph thread
// to disconnect the streams, which should be sent before the
// RunAfterPendingUpdates() call below.
dest->mInputNodes.RemoveElementAt(j);
// Remove one instance of 'dest' from mOutputNodes. There could be
// others, and it's not correct to remove them all since some of them
// could be for different output ports.
nsRefPtr<AudioNode> output = mOutputNodes[i].forget();
mOutputNodes.RemoveElementAt(i);
output->NotifyInputsChanged();
if (mStream) {
nsRefPtr<nsIRunnable> runnable = new RunnableRelease(output.forget());
mStream->RunAfterPendingUpdates(runnable.forget());
}
break;
}
}
}
for (int32_t i = mOutputParams.Length() - 1; i >= 0; --i) {
AudioParam* dest = mOutputParams[i];
for (int32_t j = dest->InputNodes().Length() - 1; j >= 0; --j) {
const InputNode& input = dest->InputNodes()[j];
if (input.mInputNode == this && input.mOutputPort == aOutput) {
dest->RemoveInputNode(j);
// Remove one instance of 'dest' from mOutputParams. There could be
// others, and it's not correct to remove them all since some of them
// could be for different output ports.
mOutputParams.RemoveElementAt(i);
break;
}
}
}
// This disconnection may have disconnected a panner and a source.
Context()->UpdatePannerSource();
}
