Module cm 

Core Media types and wrappers

This module provides Rust wrappers for Core Media framework types used in screen capture operations.

Main Types

• CMSampleBuffer - Container for media samples (audio/video frames)
• CMTime - Time value with rational timescale for precise timing
• IOSurface - Hardware-accelerated surface for zero-copy GPU access
• CMBlockBuffer - Block of contiguous data (audio/compressed video)
• AudioBuffer - Audio data buffer with sample data
• AudioBufferList - Collection of audio buffers for multi-channel audio
• SCFrameStatus - Status of a captured frame (complete, idle, dropped, etc.)

Example

use screencapturekit::cm::{CMSampleBuffer, CMTime, SCFrameStatus};

fn process_frame(sample: CMSampleBuffer) {
    // Check frame status
    if sample.frame_status() == Some(SCFrameStatus::Complete) {
        // Get timestamp
        let pts = sample.presentation_timestamp();
        println!("Frame at {:?}", pts);

        // Access pixel buffer for CPU processing
        if let Some(pixel_buffer) = sample.image_buffer() {
            // Access IOSurface for GPU processing
            if let Some(surface) = pixel_buffer.io_surface() {
                println!("Surface: {}x{}", surface.width(), surface.height());
            }
        }
    }
}

Re-exports

pub use iosurface::IOSurface;

pub use iosurface::IOSurfaceLockGuard;

pub use iosurface::IOSurfaceLockOptions;

pub use iosurface::PlaneProperties;

Modules

codec_types

Common codec type constants

ffi

Raw FFI bindings for Core Media types.

iosurface

IOSurface - Hardware-accelerated surface

media_types

Common media type constants

Structs

AudioBuffer

Raw audio buffer containing sample data

AudioBufferList

List of audio buffers from an audio sample

AudioBufferListIter

Iterator over audio buffers in an AudioBufferList

AudioBufferListRaw

List of audio buffers from an audio sample

AudioBufferRef

Reference to an audio buffer with convenience methods

CMBlockBuffer

Block buffer containing contiguous media data

CMClock

CMClock wrapper for synchronization clock

CMFormatDescription

CMSampleBuffer

Opaque handle to CMSampleBuffer

CMSampleTimingInfo

Sample timing information

CMTime

CMTime representation matching Core Media’s CMTime

Enums

SCFrameStatus

Frame status for captured screen content