void checkForPacketArrival(void* /*clientData*/) {
if (!notifyOnPacketArrival) return; // we're not checking
// Check each subsession, to see whether it has received data packets:
unsigned numSubsessionsChecked = 0;
unsigned numSubsessionsWithReceivedData = 0;
unsigned numSubsessionsThatHaveBeenSynced = 0;
MediaSubsessionIterator iter(*session);
MediaSubsession* subsession;
while ((subsession = iter.next()) != NULL)
{
RTPSource* src = subsession->rtpSource();
if (src == NULL) continue;
++numSubsessionsChecked;
if (src->receptionStatsDB().numActiveSourcesSinceLastReset() > 0)
{
// At least one data packet has arrived
++numSubsessionsWithReceivedData;
}
if (src->hasBeenSynchronizedUsingRTCP())
++numSubsessionsThatHaveBeenSynced;
}
unsigned numSubsessionsToCheck = numSubsessionsChecked;
// Special case for "QuickTimeFileSink"s and "AVIFileSink"s:
// They might not use all of the input sources:
if (qtOut != NULL)
numSubsessionsToCheck = qtOut->numActiveSubsessions();
else if (aviOut != NULL)
numSubsessionsToCheck = aviOut->numActiveSubsessions();
Boolean notifyTheUser;
if (!syncStreams)
notifyTheUser = numSubsessionsWithReceivedData > 0; // easy case
else
{
notifyTheUser = numSubsessionsWithReceivedData >= numSubsessionsToCheck
&& numSubsessionsThatHaveBeenSynced == numSubsessionsChecked;
// Note: A subsession with no active sources is considered to be synced
}
if (notifyTheUser)
{
struct timeval timeNow;
gettimeofday(&timeNow, NULL);
char timestampStr[100];
sprintf(timestampStr, "%ld%03ld", timeNow.tv_sec, (long)(timeNow.tv_usec/1000));
*env << (syncStreams ? "Synchronized d" : "D")
<< "ata packets have begun arriving [" << timestampStr << "]\007\n";
return;
}
// No luck, so reschedule this check again, after a delay:
int uSecsToDelay = 100000; // 100 ms
arrivalCheckTimerTask
= env->taskScheduler().scheduleDelayedTask(uSecsToDelay,
(TaskFunc*)checkForPacketArrival, NULL);
}
