apple.avfoundation.protocol

Interface AVVideoCompositionInstruction

All Known Implementing Classes:

AVMutableVideoCompositionInstruction, AVVideoCompositionInstruction

public interface AVVideoCompositionInstruction

[@protocol] AVVideoCompositionInstruction

The AVVideoCompositionInstruction protocol is implemented by objects to represent operations to be performed by a compositor.

Method Summary

Modifier and Type	Method and Description
boolean	containsTweening() If YES, rendering a frame from the same source buffers and the same composition instruction at 2 different compositionTime may yield different output frames.
boolean	enablePostProcessing() If NO, indicates that post-processing should be skipped for the duration of this instruction.
int	passthroughTrackID() kCMPersistentTrackID_Invalid if not a passthrough instruction
default NSArray<? extends NSNumber>	requiredSourceSampleDataTrackIDs() List of sample data track IDs required to compose frames for this instruction.
NSArray<? extends NSValue>	requiredSourceTrackIDs() List of video track IDs required to compose frames for this instruction.
CMTimeRange	timeRange() Indicates the timeRange during which the instruction is effective.

Method Detail

containsTweening

boolean containsTweening()

If YES, rendering a frame from the same source buffers and the same composition instruction at 2 different compositionTime may yield different output frames. If NO, 2 such compositions would yield the same frame. The media pipeline may me able to avoid some duplicate processing when containsTweening is NO

enablePostProcessing

boolean enablePostProcessing()

If NO, indicates that post-processing should be skipped for the duration of this instruction. See +[AVVideoCompositionCoreAnimationTool videoCompositionToolWithPostProcessingAsVideoLayer:inLayer:].

passthroughTrackID

int passthroughTrackID()

kCMPersistentTrackID_Invalid if not a passthrough instruction

requiredSourceTrackIDs

NSArray<? extends NSValue> requiredSourceTrackIDs()

List of video track IDs required to compose frames for this instruction. If the value of this property is nil, all source tracks will be considered required for composition

timeRange

CMTimeRange timeRange()

Indicates the timeRange during which the instruction is effective. Note requirements for the timeRanges of instructions described in connection with AVVideoComposition's instructions key above.

requiredSourceSampleDataTrackIDs

default NSArray<? extends NSNumber> requiredSourceSampleDataTrackIDs()

List of sample data track IDs required to compose frames for this instruction. An empty array indicates that no sample data is required for this instruction.