void
AudioDestinationNode::CreateAudioChannelAgent()
{
if (mIsOffline || !UseAudioChannelService()) {
return;
}
if (mAudioChannelAgent) {
mAudioChannelAgent->NotifyStoppedPlaying();
}
mAudioChannelAgent = new AudioChannelAgent();
mAudioChannelAgent->InitWithWeakCallback(GetOwner(),
static_cast<int32_t>(mAudioChannel),
this);
// The AudioChannelAgent must start playing immediately in order to avoid
// race conditions with mozinterruptbegin/end events.
InputMuted(false);
}
bool
AudioDestinationNode::CheckAudioChannelPermissions(AudioChannel aValue)
{
if (!UseAudioChannelService()) {
return true;
}
// Only normal channel doesn't need permission.
if (aValue == AudioChannel::Normal) {
return true;
}
// Maybe this audio channel is equal to the default one.
if (aValue == AudioChannelService::GetDefaultAudioChannel()) {
return true;
}
nsCOMPtr<nsIPermissionManager> permissionManager =
services::GetPermissionManager();
if (!permissionManager) {
return false;
}
nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(GetOwner());
NS_ASSERTION(sop, "Window didn't QI to nsIScriptObjectPrincipal!");
nsCOMPtr<nsIPrincipal> principal = sop->GetPrincipal();
uint32_t perm = nsIPermissionManager::UNKNOWN_ACTION;
nsCString channel;
channel.AssignASCII(AudioChannelValues::strings[uint32_t(aValue)].value,
AudioChannelValues::strings[uint32_t(aValue)].length);
permissionManager->TestExactPermissionFromPrincipal(principal,
nsCString(NS_LITERAL_CSTRING("audio-channel-") + channel).get(),
&perm);
return perm == nsIPermissionManager::ALLOW_ACTION;
}
