Class SyncManager

The class used to synchronize the engine update loop to an external signal.

Inheritance
Object
SyncManager
Namespace: Unity.LiveCapture
Syntax
public class SyncManager
Remarks

When working with video or other data feeds in a live context (ex. broadcast, virtual production), it is important to ensure that each device in the processing pipeline outputs exactly one frame for every frame of input, and that all devices process inputs or outputs with steady, predictable timing. This helps to avoid frame drops caused by devices receiving more frames than they can handle at once (buffer overflows) or devices not having any input frames to process (buffer underflows).

This is usually achieved by feeding a signal that pulses at a specified frame rate (known as the genlock signal) into all the devices in the pipeline. When the signal is pulsed, every device will output one frame. The genlock signal is generated by one of the devices in the pipeline or an external reference clock. Devices synchronized in this manner are said to be genlocked.

This class provides a common way to configure the Unity engine update loop to synchronize to an external signal, such as a genlock signal, instead of executing the update loop as fast as possible or at the refresh rate of the output display.

Properties

ActiveSyncProvider

The ISyncProvider that is currently in control of the engine update timing.

Declaration
public ISyncProvider ActiveSyncProvider { get; }
Property Value
Type Description
ISyncProvider

Instance

The singleton instance.

Declaration
public static SyncManager Instance { get; }
Property Value
Type Description
SyncManager

Methods

TryGetSyncRate(out FrameRate)

Gets the pulse rate of the synchronization signal.

Declaration
public static bool TryGetSyncRate(out FrameRate syncRate)
Parameters
Type Name Description
FrameRate syncRate

The pulse rate of the synchronization signal.
Returns
Type Description
Boolean

true if there is a valid sync rate; otherwise, false.

Events

SyncProviderActivated

An event invoked when a sync provider takes control of the engine update timing.

Declaration
public event Action<ISyncProvider> SyncProviderActivated
Event Type
Type Description
Action<ISyncProvider>
See Also

SyncProviderDeactivated

An event invoked when a sync provider releases control of the engine update timing.

Declaration
public event Action<ISyncProvider> SyncProviderDeactivated
Event Type
Type Description
Action<ISyncProvider>
See Also