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AVVideoIOUnit.swift
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AVVideoIOUnit.swift
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import AVFoundation
import CoreImage
final class AVVideoIOUnit: NSObject, AVIOUnit {
static let defaultAttributes: [NSString: NSObject] = [
kCVPixelBufferPixelFormatTypeKey: NSNumber(value: kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange),
kCVPixelBufferMetalCompatibilityKey: kCFBooleanTrue
]
let lockQueue = DispatchQueue(label: "com.haishinkit.HaishinKit.VideoIOComponent.lock")
var context: CIContext? {
didSet {
for effect in effects {
effect.ciContext = context
}
}
}
#if os(iOS) || os(macOS)
weak var drawable: NetStreamDrawable? {
didSet {
drawable?.orientation = orientation
}
}
#else
weak var drawable: NetStreamDrawable?
#endif
var formatDescription: CMVideoFormatDescription? {
didSet {
codec.formatDescription = formatDescription
}
}
lazy var codec: VideoCodec = {
var codec = VideoCodec()
codec.lockQueue = lockQueue
return codec
}()
weak var mixer: AVMixer?
private(set) var effects: Set<VideoEffect> = []
private var extent = CGRect.zero {
didSet {
guard extent != oldValue else {
return
}
pixelBufferPool = nil
}
}
private var attributes: [NSString: NSObject] {
var attributes: [NSString: NSObject] = Self.defaultAttributes
attributes[kCVPixelBufferWidthKey] = NSNumber(value: Int(extent.width))
attributes[kCVPixelBufferHeightKey] = NSNumber(value: Int(extent.height))
return attributes
}
private var _pixelBufferPool: CVPixelBufferPool?
private var pixelBufferPool: CVPixelBufferPool! {
get {
if _pixelBufferPool == nil {
var pixelBufferPool: CVPixelBufferPool?
CVPixelBufferPoolCreate(nil, nil, attributes as CFDictionary?, &pixelBufferPool)
_pixelBufferPool = pixelBufferPool
}
return _pixelBufferPool!
}
set {
_pixelBufferPool = newValue
}
}
#if os(iOS) || os(macOS)
var fps: Float64 = AVMixer.defaultFPS {
didSet {
guard
let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device,
let data = device.actualFPS(fps) else {
return
}
fps = data.fps
codec.expectedFrameRate = data.fps
logger.info("\(data)")
do {
try device.lockForConfiguration()
device.activeVideoMinFrameDuration = data.duration
device.activeVideoMaxFrameDuration = data.duration
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while locking device for fps: \(error)")
}
}
}
var position: AVCaptureDevice.Position = .back
var videoSettings: [NSObject: AnyObject] = AVMixer.defaultVideoSettings {
didSet {
output.videoSettings = videoSettings as? [String: Any]
}
}
var isVideoMirrored = false {
didSet {
guard isVideoMirrored != oldValue else {
return
}
for connection in output.connections where connection.isVideoMirroringSupported {
connection.isVideoMirrored = isVideoMirrored
}
}
}
var orientation: AVCaptureVideoOrientation = .portrait {
didSet {
drawable?.orientation = orientation
guard orientation != oldValue else {
return
}
for connection in output.connections where connection.isVideoOrientationSupported {
connection.videoOrientation = orientation
if torch {
setTorchMode(.on)
}
#if os(iOS)
connection.preferredVideoStabilizationMode = preferredVideoStabilizationMode
#endif
}
}
}
var torch = false {
didSet {
guard torch != oldValue else {
return
}
setTorchMode(torch ? .on : .off)
}
}
var continuousAutofocus = false {
didSet {
guard continuousAutofocus != oldValue else {
return
}
let focusMode: AVCaptureDevice.FocusMode = continuousAutofocus ? .continuousAutoFocus : .autoFocus
guard let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device,
device.isFocusModeSupported(focusMode) else {
logger.warn("focusMode(\(focusMode.rawValue)) is not supported")
return
}
do {
try device.lockForConfiguration()
device.focusMode = focusMode
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while locking device for autofocus: \(error)")
}
}
}
var focusPointOfInterest: CGPoint? {
didSet {
guard
let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device,
let point: CGPoint = focusPointOfInterest,
device.isFocusPointOfInterestSupported else {
return
}
do {
try device.lockForConfiguration()
device.focusPointOfInterest = point
device.focusMode = continuousAutofocus ? .continuousAutoFocus : .autoFocus
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while locking device for focusPointOfInterest: \(error)")
}
}
}
var exposurePointOfInterest: CGPoint? {
didSet {
guard
let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device,
let point: CGPoint = exposurePointOfInterest,
device.isExposurePointOfInterestSupported else {
return
}
do {
try device.lockForConfiguration()
device.exposurePointOfInterest = point
device.exposureMode = continuousExposure ? .continuousAutoExposure : .autoExpose
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while locking device for exposurePointOfInterest: \(error)")
}
}
}
var continuousExposure = false {
didSet {
guard continuousExposure != oldValue else {
return
}
let exposureMode: AVCaptureDevice.ExposureMode = continuousExposure ? .continuousAutoExposure : .autoExpose
guard let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device,
device.isExposureModeSupported(exposureMode) else {
logger.warn("exposureMode(\(exposureMode.rawValue)) is not supported")
return
}
do {
try device.lockForConfiguration()
device.exposureMode = exposureMode
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while locking device for autoexpose: \(error)")
}
}
}
#if os(iOS)
var preferredVideoStabilizationMode: AVCaptureVideoStabilizationMode = .off {
didSet {
guard preferredVideoStabilizationMode != oldValue else {
return
}
for connection in output.connections {
connection.preferredVideoStabilizationMode = preferredVideoStabilizationMode
}
}
}
#endif
private var _output: AVCaptureVideoDataOutput?
var output: AVCaptureVideoDataOutput! {
get {
if _output == nil {
_output = AVCaptureVideoDataOutput()
_output?.alwaysDiscardsLateVideoFrames = true
_output?.videoSettings = videoSettings as? [String: Any]
}
return _output!
}
set {
if _output == newValue {
return
}
if let output: AVCaptureVideoDataOutput = _output {
output.setSampleBufferDelegate(nil, queue: nil)
mixer?.session.removeOutput(output)
}
_output = newValue
}
}
var input: AVCaptureInput? {
didSet {
guard let mixer: AVMixer = mixer, oldValue != input else {
return
}
if let oldValue: AVCaptureInput = oldValue {
mixer.session.removeInput(oldValue)
}
if let input: AVCaptureInput = input, mixer.session.canAddInput(input) {
mixer.session.addInput(input)
}
}
}
#endif
#if os(iOS)
var screen: CaptureSessionConvertible? {
didSet {
if let oldValue = oldValue {
oldValue.delegate = nil
}
if let screen = screen {
screen.delegate = self
}
}
}
#endif
deinit {
if Thread.isMainThread {
self.drawable?.attachStream(nil)
} else {
DispatchQueue.main.sync {
self.drawable?.attachStream(nil)
}
}
#if os(iOS) || os(macOS)
input = nil
output = nil
#endif
}
#if os(iOS) || os(macOS)
func attachCamera(_ camera: AVCaptureDevice?) throws {
guard let mixer: AVMixer = mixer else {
return
}
mixer.session.beginConfiguration()
defer {
mixer.session.commitConfiguration()
if torch {
setTorchMode(.on)
}
}
output = nil
guard let camera: AVCaptureDevice = camera else {
mixer.mediaSync = .passthrough
input = nil
return
}
mixer.mediaSync = .video
#if os(iOS)
screen = nil
#endif
input = try AVCaptureDeviceInput(device: camera)
mixer.session.addOutput(output)
for connection in output.connections {
if connection.isVideoOrientationSupported {
connection.videoOrientation = orientation
}
if connection.isVideoMirroringSupported {
connection.isVideoMirrored = isVideoMirrored
}
#if os(iOS)
connection.preferredVideoStabilizationMode = preferredVideoStabilizationMode
#endif
}
output.setSampleBufferDelegate(self, queue: lockQueue)
fps *= 1
position = camera.position
drawable?.position = camera.position
}
func setTorchMode(_ torchMode: AVCaptureDevice.TorchMode) {
guard let device: AVCaptureDevice = (input as? AVCaptureDeviceInput)?.device, device.isTorchModeSupported(torchMode) else {
logger.warn("torchMode(\(torchMode)) is not supported")
return
}
do {
try device.lockForConfiguration()
device.torchMode = torchMode
device.unlockForConfiguration()
} catch let error as NSError {
logger.error("while setting torch: \(error)")
}
}
#endif
@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
}
}
extension AVVideoIOUnit {
func encodeSampleBuffer(_ sampleBuffer: CMSampleBuffer) {
guard let buffer: CVImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
return
}
var imageBuffer: CVImageBuffer?
CVPixelBufferLockBaseAddress(buffer, [])
defer {
CVPixelBufferUnlockBaseAddress(buffer, [])
if let imageBuffer = imageBuffer {
CVPixelBufferUnlockBaseAddress(imageBuffer, [])
}
}
if drawable != nil || !effects.isEmpty {
let image: CIImage = effect(buffer, info: sampleBuffer)
extent = image.extent
if !effects.isEmpty {
#if os(macOS)
CVPixelBufferPoolCreatePixelBuffer(nil, pixelBufferPool, &imageBuffer)
#else
if buffer.width != Int(extent.width) || buffer.height != Int(extent.height) {
CVPixelBufferPoolCreatePixelBuffer(nil, pixelBufferPool, &imageBuffer)
}
#endif
if let imageBuffer = imageBuffer {
CVPixelBufferLockBaseAddress(imageBuffer, [])
}
context?.render(image, to: imageBuffer ?? buffer)
}
drawable?.enqueue(sampleBuffer)
}
codec.inputBuffer(
imageBuffer ?? buffer,
presentationTimeStamp: sampleBuffer.presentationTimeStamp,
duration: sampleBuffer.duration
)
mixer?.recorder.appendPixelBuffer(imageBuffer ?? buffer, withPresentationTime: sampleBuffer.presentationTimeStamp)
}
}
extension AVVideoIOUnit: AVIOUnitEncoding {
func startEncoding(_ delegate: AVCodecDelegate) {
#if os(iOS)
screen?.startRunning()
#endif
codec.delegate = delegate
codec.startRunning()
}
func stopEncoding() {
#if os(iOS)
screen?.stopRunning()
#endif
codec.stopRunning()
codec.delegate = nil
}
}
extension AVVideoIOUnit: AVIOUnitDecoding {
func startDecoding(_ audioEndinge: AVAudioEngine) {
codec.delegate = self
codec.startRunning()
}
func stopDecoding() {
codec.stopRunning()
drawable?.enqueue(nil)
}
}
extension AVVideoIOUnit: AVCaptureVideoDataOutputSampleBufferDelegate {
// MARK: AVCaptureVideoDataOutputSampleBufferDelegate
func captureOutput(_ captureOutput: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
guard mixer?.useSampleBuffer(sampleBuffer: sampleBuffer, mediaType: AVMediaType.video) == true else {
return
}
#if os(macOS)
if connection.isVideoMirrored {
sampleBuffer.reflectHorizontal()
}
#endif
encodeSampleBuffer(sampleBuffer)
}
}
extension AVVideoIOUnit: VideoCodecDelegate {
// MARK: VideoCodecDelegate
func videoCodec(_ codec: VideoCodec, didSet formatDescription: CMFormatDescription?) {
}
func videoCodec(_ codec: VideoCodec, didOutput sampleBuffer: CMSampleBuffer) {
drawable?.enqueue(sampleBuffer)
}
func videoCodec(_ codec: VideoCodec, errorOccurred error: VideoCodec.Error) {
}
}