Const
This field shall indicate whether audio is unmuted by the player due to a FF or REW command. This field is only meaningful when the PlaybackSpeed is present and not equal to 0 (paused) or 1 (normal playback). Typically the value will be false (muted), however, some players will play audio during certain fast forward and rewind speeds, and in these cases, the value will be true (not muted).
A value of true does not guarantee that audio can be heard by the user since the speaker may be muted, turned down to a low level and/or unplugged.
This field shall indicate the updated playback state as defined by the CurrentState attribute, and has the same constraint as that attribute.
This field shall indicate Optional app-specific data.
This field shall indicate the updated duration as defined by the Duration attribute, and has the same constraint as that attribute.
This field shall indicate the updated speed at which the current media is being played as defined by the PlaybackSpeed attribute, and has the same constraint as that attribute.
This field shall indicate the updated position of playback as defined by the SampledPosition attribute, and has the same constraint as that attribute.
This field shall indicate the updated start of the seek range end as defined by the SeekRangeEnd attribute, and has the same constraint as that attribute.
This field shall indicate the updated start of the seek range start as defined by the SeekRangeStart attribute, and has the same constraint as that attribute.
This field shall indicate the updated start time as defined by the StartTime attribute, and has the same constraint as that attribute.
Body of the MediaPlayback stateChanged event