Core Media I/O

Overview

Use the Core Media I/O framework to enable support for custom camera devices in macOS. Starting in macOS 12.3, the framework builds on System Extensions to enable you to support custom devices while maintaining system privacy and security protections. The system prevents apps from loading extension code into their process to ensure that they can’t bypass macOS privacy protections or mask their identity.

Topics

Providers

• Creating a camera extension with Core Media I/O
• Overriding the default USB video class extension
• CMIOExtensionProvider
• CMIOExtensionProviderSource
• CMIOExtensionProviderProperties

Devices

• CMIOExtensionDevice
• CMIOExtensionDeviceSource
• CMIOExtensionDeviceProperties

Streams

• CMIOExtensionStream
• CMIOExtensionStreamSource
• CMIOExtensionStreamProperties
• CMIOExtensionClient

Properties

• CMIOExtensionProperty
• CMIOExtensionPropertyState
• CMIOExtensionPropertyAttributes
• CMIOExtensionInfoDictionaryKey
• CMIOExtensionMachServiceNameKey

DAL Plug-Ins

• Device Abstraction Layer (DAL) Plug-Ins