com.twilio.voice

Class RemoteAudioTrackStats

java.lang.Object

com.twilio.voice.BaseTrackStats

com.twilio.voice.RemoteTrackStats

com.twilio.voice.RemoteAudioTrackStats

public class RemoteAudioTrackStats
extends RemoteTrackStats

Field Summary

Fields

Modifier and Type	Field and Description
int	audioLevel Audio output level
int	jitter Packet jitter measured in milliseconds
float	mos The Mean Opinion Score (MOS).

Fields inherited from class com.twilio.voice.RemoteTrackStats

bytesReceived, packetsReceived

Fields inherited from class com.twilio.voice.BaseTrackStats

codec, packetsLost, ssrc, timestamp, trackId

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

audioLevel

public final int audioLevel

Audio output level

jitter

public final int jitter

Packet jitter measured in milliseconds

mos

public final float mos

The Mean Opinion Score (MOS). This is a measure of the call audio quality.

The Mean Opinion Score (MOS) represents the call audio quality where a score of 5 represents the best audio possible, for example, real world face to face speech, and 1 represents audio quality that is unintelligible. Typically, a score of 3.5 or below for a few seconds becomes annoying to the user. The score is calculated using [Vincenty's formulae](https://en.wikipedia.org/wiki/Vincenty%27s_formulae) once per second and uses `jitter`, `rtt`, and `packet loss` values to perform the calculation. The following table describes how MOS relates to quality:

MOS Range	Perceived Quality
>= 4.2	Excellent
4.1 - 4.2	Great
3.7 - 4.0	Good
3.1 - 3.6	Almost unintelligible
< 3.1	Degraded/Unacceptable