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avfvideosrc: subtract time spent in AVF queues

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The time spent in AVF queues was being incorrectly added to running time
rather than subtracted.
This commit is contained in:
Ilya Konstantinov 2015-04-13 11:55:42 +03:00 committed by Alessandro Decina
parent 1b27538648
commit 5bc17dac29
1 changed files with 18 additions and 4 deletions
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22
sys/applemedia/avfvideosrc.m
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@ -939,7 +939,7 @@ didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
duration:(GstClockTime *)outDuration
{
CMSampleTimingInfo time_info;
GstClockTime timestamp, duration, inputClockNow, running_time;
GstClockTime timestamp, duration, input_clock_now, input_clock_diff, running_time;
CMItemCount num_timings;
GstClock *clock;
CMTime now;
@ -955,13 +955,27 @@ didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
time_info.duration.value, time_info.duration.timescale);
now = CMClockGetTime(inputClock);
inputClockNow = gst_util_uint64_scale (GST_SECOND,
input_clock_now = gst_util_uint64_scale (GST_SECOND,
now.value, now.timescale);
input_clock_diff = input_clock_now - timestamp;
GST_OBJECT_LOCK (element);
clock = GST_ELEMENT_CLOCK (element);
running_time = gst_clock_get_time (clock) - element->base_time;
timestamp = running_time + (inputClockNow - timestamp);
if (clock) {
running_time = gst_clock_get_time (clock) - element->base_time;
/* We use presentationTimeStamp to determine how much time it took
* between capturing and receiving the frame in our delegate
* (e.g. how long it spent in AVF queues), then we subtract that time
* from our running time to get the actual timestamp.
*/
if (running_time >= input_clock_diff)
timestamp = running_time - input_clock_diff;
else
timestamp = running_time;
} else {
/* no clock, can't set timestamps */
timestamp = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (element);
}