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Refactor IOMixer, IOVideoUnit, IOAudioUnit.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| import CoreImage | ||
| import CoreMedia | ||
| import Foundation | ||
|
|
||
| protocol IOVideoMixerDelegate: AnyObject { | ||
| func videoMixer(_ videoMixer: IOVideoMixer<Self>, didOutput imageBuffer: CVImageBuffer, presentationTimeStamp: CMTime) | ||
| } | ||
|
|
||
| private let kIOVideoMixer_defaultAttributes: [NSString: NSObject] = [ | ||
| kCVPixelBufferPixelFormatTypeKey: NSNumber(value: kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange), | ||
| kCVPixelBufferMetalCompatibilityKey: kCFBooleanTrue | ||
| ] | ||
|
|
||
| final class IOVideoMixer<T: IOVideoMixerDelegate> { | ||
| var muted = false | ||
| var multiCamCaptureSettings: MultiCamCaptureSettings = .default | ||
| weak var delegate: T? | ||
| var context: CIContext = .init() | ||
|
|
||
| private var extent = CGRect.zero { | ||
| didSet { | ||
| guard extent != oldValue else { | ||
| return | ||
| } | ||
| CVPixelBufferPoolCreate(nil, nil, attributes as CFDictionary?, &pixelBufferPool) | ||
| pixelBufferPool?.createPixelBuffer(&pixelBuffer) | ||
| } | ||
| } | ||
| private var attributes: [NSString: NSObject] { | ||
| var attributes: [NSString: NSObject] = kIOVideoMixer_defaultAttributes | ||
| attributes[kCVPixelBufferWidthKey] = NSNumber(value: Int(extent.width)) | ||
| attributes[kCVPixelBufferHeightKey] = NSNumber(value: Int(extent.height)) | ||
| return attributes | ||
| } | ||
| private var buffer: CVPixelBuffer? | ||
| private var pixelBuffer: CVPixelBuffer? | ||
| private var pixelBufferPool: CVPixelBufferPool? | ||
| private var multiCamSampleBuffer: CMSampleBuffer? | ||
| private(set) var effects: Set<VideoEffect> = [] | ||
|
|
||
| @inline(__always) | ||
| func effect(_ buffer: CVImageBuffer, info: CMSampleBuffer?) -> CIImage { | ||
| var image = CIImage(cvPixelBuffer: buffer) | ||
| for effect in effects { | ||
| image = effect.execute(image, info: info) | ||
| } | ||
| return image | ||
| } | ||
|
|
||
| func registerEffect(_ effect: VideoEffect) -> Bool { | ||
| effect.ciContext = context | ||
| return effects.insert(effect).inserted | ||
| } | ||
|
|
||
| func unregisterEffect(_ effect: VideoEffect) -> Bool { | ||
| effect.ciContext = nil | ||
| return effects.remove(effect) != nil | ||
| } | ||
|
|
||
| func appendSampleBuffer(_ sampleBuffer: CMSampleBuffer, channel: Int, isVideoMirrored: Bool) { | ||
| switch channel { | ||
| case 0: | ||
| var imageBuffer: CVImageBuffer? | ||
| guard let buffer = sampleBuffer.imageBuffer else { | ||
| return | ||
| } | ||
| buffer.lockBaseAddress() | ||
| defer { | ||
| buffer.unlockBaseAddress() | ||
| imageBuffer?.unlockBaseAddress() | ||
| } | ||
| #if os(macOS) | ||
| if isVideoMirrored { | ||
| buffer.reflectHorizontal() | ||
| } | ||
| #endif | ||
| if let multiCamPixelBuffer = multiCamSampleBuffer?.imageBuffer { | ||
| multiCamPixelBuffer.lockBaseAddress() | ||
| switch multiCamCaptureSettings.mode { | ||
| case .pip: | ||
| buffer.over( | ||
| multiCamPixelBuffer, | ||
| regionOfInterest: multiCamCaptureSettings.regionOfInterest, | ||
| radius: multiCamCaptureSettings.cornerRadius | ||
| ) | ||
| case .splitView: | ||
| buffer.split(multiCamPixelBuffer, direction: multiCamCaptureSettings.direction) | ||
| } | ||
| multiCamPixelBuffer.unlockBaseAddress() | ||
| } | ||
| if !effects.isEmpty { | ||
| let image = effect(buffer, info: sampleBuffer) | ||
| extent = image.extent | ||
| #if os(macOS) | ||
| pixelBufferPool?.createPixelBuffer(&imageBuffer) | ||
| #else | ||
| if buffer.width != Int(extent.width) || buffer.height != Int(extent.height) { | ||
| pixelBufferPool?.createPixelBuffer(&imageBuffer) | ||
| } | ||
| #endif | ||
| imageBuffer?.lockBaseAddress() | ||
| context.render(image, to: imageBuffer ?? buffer) | ||
| } | ||
| if muted { | ||
| imageBuffer = pixelBuffer | ||
| } | ||
| delegate?.videoMixer(self, didOutput: imageBuffer ?? buffer, presentationTimeStamp: sampleBuffer.presentationTimeStamp) | ||
| if !muted { | ||
| pixelBuffer = buffer | ||
| } | ||
| case 1: | ||
| multiCamSampleBuffer = sampleBuffer | ||
| default: | ||
| break | ||
| } | ||
| } | ||
| } |
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