CoreMedia

Media Time 6

Value types that represent timestamps, durations, ranges, and time remapping in the media pipeline.

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  CMTimeiOS 4.0+

  @typedef CMTime
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  CMTimeRangeiOS 4.0+

  @typedef CMTimeRange
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  CMTimeMappingiOS 4.0+

  @typedef CMTimeMapping
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  CMTimeFlagsiOS 4.0+

  @enum CMTimeFlags
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  CMTimeRoundingMethodiOS 4.0+

  @enum CMTimeRoundingMethod
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  CMSampleTimingInfoiOS 4.0+

  @typedef CMSampleTimingInfo

Clocks and Synchronization 5

Reference clocks and timebases used to synchronize playback, capture, and presentation.

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  CMClockiOS 6.0+

  @typedef CMClock
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  CMTimebaseiOS 6.0+

  @typedef CMTimebase
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  CMSynciOS 13.0+

  A structure that groups operations for comparing and converting between clocks and timebases.
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  CMSyncProtocoliOS 13.0+

  A protocol adopted by clocks and timebases that participate in media synchronization.
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  CMCustomNotificationInfoiOS 27.0+

  Holds custom userInfo for notification sent for a buffer event.

Sample Buffers 5

Containers that carry media samples together with their timing and format information.

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  CMSampleBufferiOS 4.0+

  @typedef CMSampleBufferRef
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  CMReadySampleBufferiOS 26.0+

  Buffer carrying readily available samples of media data.
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  CMSampleDataReferenceiOS 26.0+

  References sample data in at a URL.
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  CMSampleBufferAttachmentKeyDefinitionsiOS 27.0+

  A namespace for sample buffer attachment keys.
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  CMDroppedFrameReasoniOS 27.0+

  Constants that specify why a frame was dropped from the media pipeline.

Block Buffers and Memory 7

Reference-counted byte buffers and the memory pool used to back media sample data.

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  CMBlockBufferiOS 4.0+

  @typedef CMBlockBufferRef
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  CMBlockBufferProtocoliOS 13.0+

  Methods that operate on a range of a `CMBlockBuffer` uses
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  CMMutableDataBlockBufferiOS 26.0+

  A block buffer that provides read-write access to a range of bytes.
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  CMReadOnlyDataBlockBufferiOS 26.0+

  A block buffer that provides read-only access to the a range of bytes.
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  CMBlockBufferCustomBlockSourceiOS 4.0+

  @typedef CMBlockBufferCustomBlockSource
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  CMBlockBufferAttachmentKeyDefinitionsiOS 27.0+

  A namespace for block buffer attachment keys.
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  CMMemoryPooliOS 6.0+

  @header CMMemoryPool.h

Buffer Queues 3

FIFO queues that move buffers through the media pipeline with configurable callbacks.

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  CMBufferQueueiOS 4.0+

  @typedef CMBufferQueueRef
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  CMSimpleQueueiOS 5.0+

  @typedef CMSimpleQueueRef
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  CMBufferCallbacksiOS 4.0+

  @typedef CMBufferCallbacks

Format Descriptions 8

Descriptors of media sample layout for video, sound, text, captions, time code, and metadata.

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  CMFormatDescriptioniOS 4.0+

  @typedef CMFormatDescriptionRef
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  CMVideoDimensionsiOS 4.0+

  @typedef CMVideoDimensions
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  CMImageDescriptionFlavoriOS 8.0+

  Constants that identify variants of an image format description.
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  CMSoundDescriptionFlavoriOS 8.0+

  Constants that identify variants of a sound format description.
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  CMTextDescriptionFlavoriOS 8.0+

  Constants that identify variants of a text format description.
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  CMClosedCaptionDescriptionFlavoriOS 8.0+

  Constants that identify variants of a closed-caption format description.
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  CMTimeCodeDescriptionFlavoriOS 8.0+

  Constants that identify variants of a time-code format description.
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  CMMetadataDescriptionFlavoriOS 8.0+

  Constants that identify variants of a metadata format description.

Attachments and Tagging 6

Protocols and types for attaching metadata to buffers and tagging them with typed identifiers.

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  CMAttachmentBearerProtocoliOS 13.0+

  A protocol for objects that can carry key-value attachments such as buffers and descriptions.
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  CMAttachmentBearerAttachmentsiOS 13.0+

  A structure that represents the collection of key-value attachments on a bearer.
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  CMTagiOS 17.0+

  CMTag is used to label something about a resource or other media construct. A CMTag contains a category and a value to represent a particular tag that might be assigned to or associated with another r
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  CMTypedTagiOS 17.0+

  CMTypedTag contains strongly typed categories and values. CMTypedTag enforces the defined data types for specific categories.
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  CMTaggedBufferiOS 17.0+

  CMTaggedBuffer contains an array of CMTags and a buffer.
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  CMTaggedDynamicBufferiOS 26.0+

  Contains a collection of tags associated with a read-only media buffer.

Stereoscopic and Projected Media 6

Descriptors and enumerations that characterize stereo, projected, and camera-intrinsic media.

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  CMProjectionTypeiOS 17.0+

  @abstract Constants used with kCMTagCategory_ProjectionType to signal the nature of a video projection carried in a buffer or channel.
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  CMPackingTypeiOS 17.0+

  @abstract Constants used with kCMTagCategory_PackingType to signal the nature of any packing applied in a buffer or channel.
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  CMStereoViewComponentsiOS 17.0+

  @abstract Flags used with kCMTagCategory_StereoView tags to signal the nature of the stereo views carried in a buffer or channel.
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  CMStereoViewInterpretationOptionsiOS 17.0+

  @abstract Flags used with kCMTagCategory_StereoViewInterpretation tags to signal additional information that may be important to the interpretation of stereo views carried in a buffer or channel.
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  CMCameraIntrinsicMatrixiOS 27.0+

  A matrix that describes the camera's intrinsic properties.
• En
  CMStillImageLensStabilizationiOS 27.0+

  Constants that specify the lens-stabilization state during still image capture.

Type Aliases 59

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  CMAttachmentBearer
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  CMAttachmentMode
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  CMItemCount
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  CMItemIndex
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  CMBaseClassVersion
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  CMStructVersion
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  CMPersistentTrackID
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  CMBlockBufferFlags

  @typedef CMBlockBufferFlags
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  CMBuffer

  @typedef CMBufferRef
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  CMBufferGetTimeCallback

  @typedef CMBufferGetTimeCallback
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  CMBufferGetTimeHandler

  @typedef CMBufferGetTimeHandler
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  CMBufferGetBooleanCallback

  @typedef CMBufferGetBooleanCallback
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  CMBufferGetBooleanHandler

  @typedef CMBufferGetBooleanHandler
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  CMBufferCompareCallback

  @typedef CMBufferCompareCallback
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  CMBufferCompareHandler

  @typedef CMBufferCompareHandler
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  CMBufferGetSizeCallback

  @typedef CMBufferGetSizeCallback

Extends 5