So, I suggest adding, to your server code, code that compares the value
of 'fPresentationTime" computed your new way,
with the value that would be computed by calling "gettimeofday()", and
print out the difference
Thanks, Ross. I assume you mean, if the new presentation time becomes
different from wall clock time by a large amount, eg more than 1 second,
I should reallign fPresentationTime with wall clock time, like this
if (fPresentationTime.tv_sec == 0 && fPresentationTime.tv_usec == 0)
{
gettimeofday(&fPresentationTime, NULL);
INFO("setPresentationTime: %ld.%06ld\n",
fPresentationTime.tv_sec, fPresentationTime.tv_usec);
}
else
{
// Increment by the sample time
unsigned uSeconds = fPresentationTime.tv_usec +
(unsigned)(1000000.0/fMaxFps);
fPresentationTime.tv_sec += uSeconds/1000000;
fPresentationTime.tv_usec = uSeconds%1000000;
//check for basic alignment with 'wall clock' time
struct timeval wallclocktime;
gettimeofday(&wallclocktime, NULL);
if ((wallclocktime.tv_sec > fPresentationTime.tv_sec + 1) ||
(fPresentationTime.tv_sec > wallclocktime.tv_sec + 1) )
{ //we have drifted too far from wall clock time so need to
realign
fPresentationTime.tv_sec = wallclocktime.tv_sec;
fPresentationTime.tv_usec = wallclocktime.tv_usec;
INFO("Realigning PresentationTime with wall-clock time:
%ld.%06ld\n", fPresentationTime.tv_sec, fPresentationTime.tv_usec);
}
}
This seems to work but will need more testing. VLC seems to be very
sensitive to presentation time jumps or anomalies._______________________________________________
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