tvi.webrtc

Class TimestampAligner

java.lang.Object

tvi.webrtc.TimestampAligner

public class TimestampAligner
extends java.lang.Object

The TimestampAligner class helps translating camera timestamps into the same timescale as is used by rtc::TimeNanos(). Some cameras have built in timestamping which is more accurate than reading the system clock, but using a different epoch and unknown clock drift. Frame timestamps in webrtc should use rtc::TimeNanos (system monotonic time), and this class provides a filter which lets us use the rtc::TimeNanos timescale, and at the same time take advantage of higher accuracy of the camera clock. This class is a wrapper on top of rtc::TimestampAligner.

Constructor Summary

Constructors

Constructor and Description
TimestampAligner()

Method Summary

Modifier and Type	Method and Description
void	dispose() Dispose native timestamp aligner.
static long	getRtcTimeNanos() Wrapper around rtc::TimeNanos().
long	translateTimestamp(long cameraTimeNs) Translates camera timestamps to the same timescale as is used by rtc::TimeNanos().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TimestampAligner

public TimestampAligner()

Method Detail

getRtcTimeNanos

public static long getRtcTimeNanos()

Wrapper around rtc::TimeNanos(). This is normally same as System.nanoTime(), but call this function to be safe.

translateTimestamp

public long translateTimestamp(long cameraTimeNs)

Translates camera timestamps to the same timescale as is used by rtc::TimeNanos(). |cameraTimeNs| is assumed to be accurate, but with an unknown epoch and clock drift. Returns the translated timestamp.

dispose

public void dispose()

Dispose native timestamp aligner.