void AudioMixerClientData::sendAudioStreamStatsPackets(const SharedNodePointer& destinationNode) {
auto nodeList = DependencyManager::get<NodeList>();
// The append flag is a boolean value that will be packed right after the header.
// This flag allows the client to know when it has received all stats packets, so it can group any downstream effects,
// and clear its cache of injector stream stats; it helps to prevent buildup of dead audio stream stats in the client.
quint8 appendFlag = AudioStreamStats::START;
auto streamsCopy = getAudioStreams();
// pack and send stream stats packets until all audio streams' stats are sent
int numStreamStatsRemaining = int(streamsCopy.size());
auto it = streamsCopy.cbegin();
while (numStreamStatsRemaining > 0) {
auto statsPacket = NLPacket::create(PacketType::AudioStreamStats);
int numStreamStatsRoomFor = (int)(statsPacket->size() - sizeof(quint8) - sizeof(quint16)) / sizeof(AudioStreamStats);
// calculate the number of stream stats to follow
quint16 numStreamStatsToPack = std::min(numStreamStatsRemaining, numStreamStatsRoomFor);
// is this the terminal packet?
if (numStreamStatsRemaining <= numStreamStatsToPack) {
appendFlag |= AudioStreamStats::END;
}
// pack the append flag in this packet
statsPacket->writePrimitive(appendFlag);
appendFlag = 0;
// pack the number of stream stats to follow
statsPacket->writePrimitive(numStreamStatsToPack);
// pack the calculated number of stream stats
for (int i = 0; i < numStreamStatsToPack; i++) {
PositionalAudioStream* stream = it->second.get();
stream->perSecondCallbackForUpdatingStats();
AudioStreamStats streamStats = stream->getAudioStreamStats();
statsPacket->writePrimitive(streamStats);
++it;
}
numStreamStatsRemaining -= numStreamStatsToPack;
// send the current packet
nodeList->sendPacket(std::move(statsPacket), *destinationNode);
}
}
void AudioMixerClientData::sendAudioStreamStatsPackets(const SharedNodePointer& destinationNode) {
// since audio stream stats packets are sent periodically, this is a good place to remove our dead injected streams.
removeDeadInjectedStreams();
auto nodeList = DependencyManager::get<NodeList>();
// The append flag is a boolean value that will be packed right after the header. The first packet sent
// inside this method will have 0 for this flag, while every subsequent packet will have 1 for this flag.
// The sole purpose of this flag is so the client can clear its map of injected audio stream stats when
// it receives a packet with an appendFlag of 0. This prevents the buildup of dead audio stream stats in the client.
quint8 appendFlag = 0;
// pack and send stream stats packets until all audio streams' stats are sent
int numStreamStatsRemaining = _audioStreams.size();
QHash<QUuid, PositionalAudioStream*>::ConstIterator audioStreamsIterator = _audioStreams.constBegin();
while (numStreamStatsRemaining > 0) {
auto statsPacket = NLPacket::create(PacketType::AudioStreamStats);
// pack the append flag in this packet
statsPacket->writePrimitive(appendFlag);
appendFlag = 1;
int numStreamStatsRoomFor = (statsPacket->size() - sizeof(quint8) - sizeof(quint16)) / sizeof(AudioStreamStats);
// calculate and pack the number of stream stats to follow
quint16 numStreamStatsToPack = std::min(numStreamStatsRemaining, numStreamStatsRoomFor);
statsPacket->writePrimitive(numStreamStatsToPack);
// pack the calculated number of stream stats
for (int i = 0; i < numStreamStatsToPack; i++) {
PositionalAudioStream* stream = audioStreamsIterator.value();
stream->perSecondCallbackForUpdatingStats();
AudioStreamStats streamStats = stream->getAudioStreamStats();
statsPacket->writePrimitive(streamStats);
audioStreamsIterator++;
}
numStreamStatsRemaining -= numStreamStatsToPack;
// send the current packet
nodeList->sendPacket(std::move(statsPacket), *destinationNode);
}
}
