void AudioMixer::prepareMixForListeningNode(Node* node) {
AvatarAudioRingBuffer* nodeRingBuffer = ((AudioMixerClientData*) node->getLinkedData())->getAvatarAudioRingBuffer();
// zero out the client mix for this node
memset(_clientSamples, 0, sizeof(_clientSamples));
// loop through all other nodes that have sufficient audio to mix
foreach (const SharedNodePointer& otherNode, NodeList::getInstance()->getNodeHash()) {
if (otherNode->getLinkedData()) {
AudioMixerClientData* otherNodeClientData = (AudioMixerClientData*) otherNode->getLinkedData();
// enumerate the ARBs attached to the otherNode and add all that should be added to mix
for (unsigned int i = 0; i < otherNodeClientData->getRingBuffers().size(); i++) {
PositionalAudioRingBuffer* otherNodeBuffer = otherNodeClientData->getRingBuffers()[i];
if ((*otherNode != *node
|| otherNodeBuffer->shouldLoopbackForNode())
&& otherNodeBuffer->willBeAddedToMix()) {
addBufferToMixForListeningNodeWithBuffer(otherNodeBuffer, nodeRingBuffer);
}
}
}
}
}
void AudioMixerClientData::pushBuffersAfterFrameSend() {
QList<PositionalAudioRingBuffer*>::iterator i = _ringBuffers.begin();
while (i != _ringBuffers.end()) {
// this was a used buffer, push the output pointer forwards
PositionalAudioRingBuffer* audioBuffer = *i;
const int INJECTOR_CONSECUTIVE_NOT_MIXED_THRESHOLD = 100;
if (audioBuffer->willBeAddedToMix()) {
audioBuffer->shiftReadPosition(audioBuffer->getSamplesPerFrame());
audioBuffer->setWillBeAddedToMix(false);
} else if (audioBuffer->getType() == PositionalAudioRingBuffer::Injector
&& audioBuffer->hasStarted() && audioBuffer->isStarved()
&& audioBuffer->getConsecutiveNotMixedCount() > INJECTOR_CONSECUTIVE_NOT_MIXED_THRESHOLD) {
// this is an empty audio buffer that has starved, safe to delete
// also delete its sequence number stats
QUuid streamIdentifier = ((InjectedAudioRingBuffer*)audioBuffer)->getStreamIdentifier();
_incomingInjectedAudioSequenceNumberStatsMap.remove(streamIdentifier);
delete audioBuffer;
i = _ringBuffers.erase(i);
continue;
}
i++;
}
}
void AudioMixerClientData::pushBuffersAfterFrameSend() {
for (unsigned int i = 0; i < _ringBuffers.size(); i++) {
// this was a used buffer, push the output pointer forwards
PositionalAudioRingBuffer* audioBuffer = _ringBuffers[i];
if (audioBuffer->willBeAddedToMix()) {
audioBuffer->shiftReadPosition(audioBuffer->isStereo()
? NETWORK_BUFFER_LENGTH_SAMPLES_STEREO : NETWORK_BUFFER_LENGTH_SAMPLES_PER_CHANNEL);
audioBuffer->setWillBeAddedToMix(false);
} else if (audioBuffer->getType() == PositionalAudioRingBuffer::Injector
&& audioBuffer->hasStarted() && audioBuffer->isStarved()) {
// this is an empty audio buffer that has starved, safe to delete
delete audioBuffer;
_ringBuffers.erase(_ringBuffers.begin() + i);
}
}
}
