void
AudioChannelServiceChild::SetDefaultVolumeControlChannel(
AudioChannelType aType, bool aHidden)
{
ContentChild *cc = ContentChild::GetSingleton();
if (cc) {
cc->SendAudioChannelChangeDefVolChannel(aType, aHidden);
}
}
void
AudioChannelService::SetDefaultVolumeControlChannelInternal(int32_t aChannel,
bool aVisible,
uint64_t aChildID)
{
if (!IsParentProcess()) {
ContentChild* cc = ContentChild::GetSingleton();
if (cc) {
cc->SendAudioChannelChangeDefVolChannel(aChannel, aVisible);
}
return;
}
// If this child is in the background and mDefChannelChildID is set to
// others then it means other child in the foreground already set it's
// own default channel.
if (!aVisible && mDefChannelChildID != aChildID) {
return;
}
// Workaround for the call screen app. The call screen app is running on the
// main process, that will results in wrong visible state. Because we use the
// docshell's active state as visible state, the main process is always
// active. Therefore, we will see the strange situation that the visible
// state of the call screen is always true. If the mDefChannelChildID is set
// to others then it means other child in the foreground already set it's
// own default channel already.
// Summary :
// Child process : foreground app always can set type.
// Parent process : check the mDefChannelChildID.
else if (aChildID == CONTENT_PROCESS_ID_MAIN &&
mDefChannelChildID != CONTENT_PROCESS_ID_UNKNOWN) {
return;
}
mDefChannelChildID = aVisible ? aChildID : CONTENT_PROCESS_ID_UNKNOWN;
nsAutoString channelName;
if (aChannel == -1) {
channelName.AssignASCII("unknown");
} else {
GetAudioChannelString(static_cast<AudioChannel>(aChannel), channelName);
}
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "default-volume-channel-changed",
channelName.get());
}
}