// Receive thread proc
static void ReceiveThreadProc(void* context) {
int err;
int bufferSize, receiveSize;
char* buffer;
int queueStatus;
receiveSize = StreamConfig.packetSize + MAX_RTP_HEADER_SIZE;
bufferSize = receiveSize + sizeof(int) + sizeof(RTP_QUEUE_ENTRY);
buffer = NULL;
while (!PltIsThreadInterrupted(&receiveThread)) {
PRTP_PACKET packet;
if (buffer == NULL) {
buffer = (char*)malloc(bufferSize);
if (buffer == NULL) {
Limelog("Video Receive: malloc() failed\n");
ListenerCallbacks.connectionTerminated(-1);
return;
}
}
err = recvUdpSocket(rtpSocket, buffer, receiveSize);
if (err < 0) {
Limelog("Video Receive: recvUdpSocket() failed: %d\n", (int)LastSocketError());
ListenerCallbacks.connectionTerminated(LastSocketError());
break;
}
else if (err == 0) {
// Receive timed out; try again
continue;
}
memcpy(&buffer[receiveSize], &err, sizeof(int));
// RTP sequence number must be in host order for the RTP queue
packet = (PRTP_PACKET)&buffer[0];
packet->sequenceNumber = htons(packet->sequenceNumber);
queueStatus = RtpqAddPacket(&rtpQueue, packet, (PRTP_QUEUE_ENTRY)&buffer[receiveSize + sizeof(int)]);
if (queueStatus == RTPQ_RET_HANDLE_IMMEDIATELY) {
// queueRtpPacket() copies the data it needs to we can reuse the buffer
queueRtpPacket(packet, err);
}
else if (queueStatus == RTPQ_RET_QUEUED_PACKETS_READY) {
// The packet queue now has packets ready
while ((buffer = (char*)RtpqGetQueuedPacket(&rtpQueue)) != NULL) {
memcpy(&err, &buffer[receiveSize], sizeof(int));
queueRtpPacket((PRTP_PACKET)buffer, err);
free(buffer);
}
}
else if (queueStatus == RTPQ_RET_QUEUED_NOTHING_READY) {
// The queue owns the buffer
buffer = NULL;
}
}
if (buffer != NULL) {
free(buffer);
}
}
static void ReceiveThreadProc(void* context) {
PRTP_PACKET rtp;
PQUEUED_AUDIO_PACKET packet;
int queueStatus;
int useSelect;
int packetsToDrop = 100;
packet = NULL;
if (setNonFatalRecvTimeoutMs(rtpSocket, UDP_RECV_POLL_TIMEOUT_MS) < 0) {
// SO_RCVTIMEO failed, so use select() to wait
useSelect = 1;
}
else {
// SO_RCVTIMEO timeout set for recv()
useSelect = 0;
}
while (!PltIsThreadInterrupted(&receiveThread)) {
if (packet == NULL) {
packet = (PQUEUED_AUDIO_PACKET)malloc(sizeof(*packet));
if (packet == NULL) {
Limelog("Audio Receive: malloc() failed\n");
ListenerCallbacks.connectionTerminated(-1);
break;
}
}
packet->size = recvUdpSocket(rtpSocket, &packet->data[0], MAX_PACKET_SIZE, useSelect);
if (packet->size < 0) {
Limelog("Audio Receive: recvUdpSocket() failed: %d\n", (int)LastSocketError());
ListenerCallbacks.connectionTerminated(LastSocketFail());
break;
}
else if (packet->size == 0) {
// Receive timed out; try again
// If we hit this path, there are no queued audio packets on the host PC,
// so we don't need to drop anything.
packetsToDrop = 0;
continue;
}
if (packet->size < sizeof(RTP_PACKET)) {
// Runt packet
continue;
}
rtp = (PRTP_PACKET)&packet->data[0];
if (rtp->packetType != 97) {
// Not audio
continue;
}
// We've received data, so we can stop sending our ping packets
// as quickly, since we're now just keeping the NAT session open.
receivedDataFromPeer = 1;
// GFE accumulates audio samples before we are ready to receive them,
// so we will drop the first 100 packets to avoid accumulating latency
// by sending audio frames to the player faster than they can be played.
if (packetsToDrop > 0) {
packetsToDrop--;
continue;
}
// RTP sequence number must be in host order for the RTP queue
rtp->sequenceNumber = htons(rtp->sequenceNumber);
queueStatus = RtpqAddPacket(&rtpReorderQueue, (PRTP_PACKET)packet, &packet->q.rentry);
if (RTPQ_HANDLE_NOW(queueStatus)) {
if ((AudioCallbacks.capabilities & CAPABILITY_DIRECT_SUBMIT) == 0) {
if (!queuePacketToLbq(&packet)) {
// An exit signal was received
break;
}
}
else {
decodeInputData(packet);
}
}
else {
if (RTPQ_PACKET_CONSUMED(queueStatus)) {
// The queue consumed our packet, so we must allocate a new one
packet = NULL;
}
if (RTPQ_PACKET_READY(queueStatus)) {
// If packets are ready, pull them and send them to the decoder
while ((packet = (PQUEUED_AUDIO_PACKET)RtpqGetQueuedPacket(&rtpReorderQueue)) != NULL) {
if ((AudioCallbacks.capabilities & CAPABILITY_DIRECT_SUBMIT) == 0) {
if (!queuePacketToLbq(&packet)) {
// An exit signal was received
break;
}
}
else {
decodeInputData(packet);
free(packet);
}
}
// Break on exit
if (packet != NULL) {
break;
}
}
}
}
if (packet != NULL) {
free(packet);
}
}