Core Video

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Core Video is a framework in macOS and iOS that provides services for processing video and media. It is part of the Core Media framework and is used in conjunction with other frameworks such as Core Animation, Core Image, and Core Audio to handle complex video processing tasks.

Overview

Core Video is designed to handle the manipulation and display of video content. It provides a pipeline for managing the flow of video frames from a source to a destination, which can be a display or a file. The framework is optimized for performance and leverages the hardware capabilities of Apple devices to ensure smooth video playback and processing.

Key Components

Core Video consists of several key components:

• CVImageBufferRef: A type that represents a video frame. It is a buffer that holds image data.
• CVPixelBufferRef: A subtype of CVImageBufferRef that specifically holds pixel data. It is used for raw image data that can be processed or displayed.
• CVOpenGLBufferRef: A buffer that is used in conjunction with OpenGL to render video frames.
• CVDisplayLinkRef: A timer-based mechanism that synchronizes the display of video frames with the refresh rate of a display.

Functionality

Core Video provides several important functionalities:

• Buffer Management: Core Video manages the allocation and deallocation of video buffers, ensuring efficient use of memory and resources.
• Synchronization: The framework synchronizes video playback with the display's refresh rate, reducing tearing and ensuring smooth playback.
• Conversion: Core Video can convert video frames between different formats and color spaces, making it easier to work with various types of video content.
• Integration: Core Video integrates seamlessly with other media frameworks like AVFoundation and Core Media, allowing developers to build complex media applications.

Applications

Core Video is used in a variety of applications, including:

• Video editing software
• Media players
• Streaming applications
• Augmented reality and virtual reality applications

See Also

• Core Animation
• Core Image
• Core Audio
• AVFoundation
• Core Media

External Links

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