Ios 从[UIImage]创建电影，Swift
我找到了，但都在ObjectiveC中，我无法为Swift找到答案 我需要从[UIImage]创建一个视频 在上面的链接中处理Zoul的答案。第1部分）给作者打电话 到目前为止，我已经：Ios 从[UIImage]创建电影，Swift,ios,swift,video,avfoundation,Ios,Swift,Video,Avfoundation,我找到了，但都在ObjectiveC中，我无法为Swift找到答案 我需要从[UIImage]创建一个视频 在上面的链接中处理Zoul的答案。第1部分）给作者打电话 到目前为止，我已经： let paths = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask) let documentsURL = paths[0] as! NSURL le
let paths = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
let documentsURL = paths[0] as! NSURL
let videoWriter:AVAssetWriter = AVAssetWriter(URL: documentsURL, fileType: AVFileTypeQuickTimeMovie, error: nil)
var videoSettings: NSDictionary = NSDictionary(
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:640], AVVideoWidthKey,
[NSNumber numberWithInt:480], AVVideoHeightKey,
nil];
构建
字典import AVFoundation
let videoSettings = [
AVVideoCodecKey: AVVideoCodecH264,
AVVideoWidthKey: 640,
AVVideoHeightKey: 480
]
至于其他方面，我鼓励你先通读苹果的《建立基本原理》，而不是依赖于SO或教程，这些教程恰好涵盖了你想要做的事情。“教人钓鱼”，正如他们所说。我将“@Cameron E”发布的objective-c代码转换为Swift 3，它开始工作了。答案链接： 以下是CXEImagesToVideo类：
//
// CXEImagesToVideo.swift
// VideoAPPTest
//
// Created by Wulei on 16/12/14.
// Copyright © 2016 wulei. All rights reserved.
//
import Foundation
import AVFoundation
import UIKit
typealias CXEMovieMakerCompletion = (URL) -> Void
typealias CXEMovieMakerUIImageExtractor = (AnyObject) -> UIImage?
public class CXEImagesToVideo: NSObject{
var assetWriter:AVAssetWriter!
var writeInput:AVAssetWriterInput!
var bufferAdapter:AVAssetWriterInputPixelBufferAdaptor!
var videoSettings:[String : Any]!
var frameTime:CMTime!
var fileURL:URL!
var completionBlock: CXEMovieMakerCompletion?
var movieMakerUIImageExtractor:CXEMovieMakerUIImageExtractor?
public class func videoSettings(codec:String, width:Int, height:Int) -> [String: Any]{
if(Int(width) % 16 != 0){
print("warning: video settings width must be divisible by 16")
}
let videoSettings:[String: Any] = [AVVideoCodecKey: AVVideoCodecH264,
AVVideoWidthKey: width,
AVVideoHeightKey: height]
return videoSettings
}
public init(videoSettings: [String: Any]) {
super.init()
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let tempPath = paths[0] + "/exprotvideo.mp4"
if(FileManager.default.fileExists(atPath: tempPath)){
guard (try? FileManager.default.removeItem(atPath: tempPath)) != nil else {
print("remove path failed")
return
}
}
self.fileURL = URL(fileURLWithPath: tempPath)
self.assetWriter = try! AVAssetWriter(url: self.fileURL, fileType: AVFileTypeQuickTimeMovie)
self.videoSettings = videoSettings
self.writeInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: videoSettings)
assert(self.assetWriter.canAdd(self.writeInput), "add failed")
self.assetWriter.add(self.writeInput)
let bufferAttributes:[String: Any] = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32ARGB)]
self.bufferAdapter = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: self.writeInput, sourcePixelBufferAttributes: bufferAttributes)
self.frameTime = CMTimeMake(1, 10)
}
func createMovieFrom(urls: [URL], withCompletion: @escaping CXEMovieMakerCompletion){
self.createMovieFromSource(images: urls as [AnyObject], extractor:{(inputObject:AnyObject) ->UIImage? in
return UIImage(data: try! Data(contentsOf: inputObject as! URL))}, withCompletion: withCompletion)
}
func createMovieFrom(images: [UIImage], withCompletion: @escaping CXEMovieMakerCompletion){
self.createMovieFromSource(images: images, extractor: {(inputObject:AnyObject) -> UIImage? in
return inputObject as? UIImage}, withCompletion: withCompletion)
}
func createMovieFromSource(images: [AnyObject], extractor: @escaping CXEMovieMakerUIImageExtractor, withCompletion: @escaping CXEMovieMakerCompletion){
self.completionBlock = withCompletion
self.assetWriter.startWriting()
self.assetWriter.startSession(atSourceTime: kCMTimeZero)
let mediaInputQueue = DispatchQueue(label: "mediaInputQueue")
var i = 0
let frameNumber = images.count
self.writeInput.requestMediaDataWhenReady(on: mediaInputQueue){
while(true){
if(i >= frameNumber){
break
}
if (self.writeInput.isReadyForMoreMediaData){
var sampleBuffer:CVPixelBuffer?
autoreleasepool{
let img = extractor(images[i])
if img == nil{
i += 1
print("Warning: counld not extract one of the frames")
//continue
}
sampleBuffer = self.newPixelBufferFrom(cgImage: img!.cgImage!)
}
if (sampleBuffer != nil){
if(i == 0){
self.bufferAdapter.append(sampleBuffer!, withPresentationTime: kCMTimeZero)
}else{
let value = i - 1
let lastTime = CMTimeMake(Int64(value), self.frameTime.timescale)
let presentTime = CMTimeAdd(lastTime, self.frameTime)
self.bufferAdapter.append(sampleBuffer!, withPresentationTime: presentTime)
}
i = i + 1
}
}
}
self.writeInput.markAsFinished()
self.assetWriter.finishWriting {
DispatchQueue.main.sync {
self.completionBlock!(self.fileURL)
}
}
}
}
func newPixelBufferFrom(cgImage:CGImage) -> CVPixelBuffer?{
let options:[String: Any] = [kCVPixelBufferCGImageCompatibilityKey as String: true, kCVPixelBufferCGBitmapContextCompatibilityKey as String: true]
var pxbuffer:CVPixelBuffer?
let frameWidth = self.videoSettings[AVVideoWidthKey] as! Int
let frameHeight = self.videoSettings[AVVideoHeightKey] as! Int
let status = CVPixelBufferCreate(kCFAllocatorDefault, frameWidth, frameHeight, kCVPixelFormatType_32ARGB, options as CFDictionary?, &pxbuffer)
assert(status == kCVReturnSuccess && pxbuffer != nil, "newPixelBuffer failed")
CVPixelBufferLockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
let pxdata = CVPixelBufferGetBaseAddress(pxbuffer!)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: pxdata, width: frameWidth, height: frameHeight, bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pxbuffer!), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.noneSkipFirst.rawValue)
assert(context != nil, "context is nil")
context!.concatenate(CGAffineTransform.identity)
context!.draw(cgImage, in: CGRect(x: 0, y: 0, width: cgImage.width, height: cgImage.height))
CVPixelBufferUnlockBaseAddress(pxbuffer!, CVPixelBufferLockFlags(rawValue: 0))
return pxbuffer
}
}
var uiImages = [UIImage]()
/** add image to uiImages */
let settings = CXEImagesToVideo.videoSettings(codec: AVVideoCodecH264, width: (uiImages[0].cgImage?.width)!, height: (uiImages[0].cgImage?.height)!)
let movieMaker = CXEImagesToVideo(videoSettings: settings)
movieMaker.createMovieFrom(images: uiImages){ (fileURL:URL) in
let video = AVAsset(url: fileURL)
let playerItem = AVPlayerItem(asset: video)
let avPlayer = AVPlayer(playerItem: playerItem)
let playerLayer = AVPlayerLayer(player: avPlayer)
playerLayer.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.width * 3.0 / 4.0)
self.view.layer.addSublayer(playerLayer)
avPlayer.play()
}
- 从图像生成视频并手动保存
- 图片来自prev 控制器
//VideoMakerViewController.swift
//录像机
//伊莎·帕特尔于2018年10月5日创作。
//版权所有©2018 Isha Patel。版权所有。
进口AVF基金会
导入UIKit
导入照片
进口AVKit
var tempurl=“”
类VideoMakerViewController:UIViewController{
变量图像：[UIImage]=[]
@IBVAR视频视图：UIView！
重写func viewDidLoad（）{
super.viewDidLoad（）
DispatchQueue.main.async{
让设置=渲染设置（）
让imageAnimator=imageAnimator（渲染设置：设置，imagearr:self.images）
imageAnimator.render（）{
self.displayVideo（）
}
}
}
func displayVideo（）
{
让u:String=tempurl
let player=AVPlayer（url:url（fileURLWithPath:u））
让playerController=AVPlayerViewController（）
playerController.player=玩家
self.addChild（playerController）
videoview.addSubview（playerController.view）
playerController.view.frame.size=（videoview.frame.size）
playerController.view.contentMode=.ScaleSpectFit
playerController.view.backgroundColor=UIColor.clear
videoview.backgroundColor=UIColor.clear
player.play（）
}
@iAction func save（uu发送方：UIBarButtonim）{
PHPhotoLibrary.requestAuthorization{中的状态
保护状态==.authorized else{return}
让u:String=tempurl
PHPhotoLibrary.shared（）.performChanges({
PhaseSetChangeRequest.creationRequestForAssetFromVideo（atFileURL:URL（fileURLWithPath:u）作为URL）
}){成功，失败
如果！成功{
打印（“无法将视频保存到照片库：”，错误！）
}
}
}
}
}
结构渲染设置{
变量宽度：CGFloat=1500
变量高度：CGFloat=844
var fps:Int32=2//2帧/秒
var avCodecKey=AVVideoCodecType.h264
var videoFilename=“renderExportVideo”
var videoFilenameExt=“mp4”
变量大小：CGSize{
返回CGSize（宽度：宽度，高度：高度）
}
变量输出URL:NSURL{
让fileManager=fileManager.default
如果让tmpdirrl=try？fileManager.url（对于：.cachesDirectory，在：.userDomainMask中，适用于：nil，创建：true）{
返回tmpDirURL.appendingPathComponent（videoFilename）.appendingPathExtension（videoFilenameExt）作为NSURL
}
fatalError（“URLForDirectory（）失败”）
}
}
班级录像机{
让渲染设置：渲染设置
var视频写手：一个作家！
var videoWriterInput:AVAssetWriterInput！
var PixelBufferAdapter:AvassetWriterInputPixelBufferAdapter！
变量isReadyForData:Bool{
返回videoWriterInput？isReadyForMoreMediaData？false
}
类func pixelBufferFromImage（图像：UIImage，pixelBufferPool:CVPixelBufferPool，大小：CGSize）->CVPixelBuffer{
var pixelBufferOut:CVPixelBuffer？
let status=CVPixelBufferPoolCreatePixelBuffer（kCFAllocatorDefault、pixelBufferPool和pixelBufferOut）
如果状态！=kCVReturnSuccess{
fatalError（“CVPixelBufferPoolCreatePixelBuffer（）失败”）
}
让pixelBuffer=pixelBufferOut！
CVPixelBufferLockBaseAddress（pixelBuffer，[]））
let data=CVPixelBufferGetBaseAddress（pixelBuffer）
设rgbColorSpace=CGColorSpaceCreateDeviceRGB（）
让context=CGContext（数据：数据，宽度：Int（size.width），高度：Int（size.height），
bitsPerComponent:8，bytesPerRow:CVPixelBufferGetBytesPerRow（pixelBuffer），空格：rgbColorSpace，bitmapInfo:CGImageAlphaInfo.PremultipledFirst.rawValue）
context！.clear（CGRect（x:0，y:0，width:size.width，height:size.height））
让水平比率=size.width/image.size.width
让垂直比率=size.height/image.size.height
设aspectRatio=min（水平比、垂直比）//ScaleAspectFit
let newSize=CGSize（宽度：image.size.width*aspectRatio，高度：image.size.height*aspectRatio）
设x=newSize.width// VideoMakerViewController.swift
// VideoMaker
//Created by ISHA PATEL on 05/10/18.
// Copyright © 2018 Isha Patel. All rights reserved.
import AVFoundation
import UIKit
import Photos
import AVKit
var tempurl=""
class VideoMakerViewController: UIViewController {
var images:[UIImage]=[]
@IBOutlet weak var videoview: UIView!
override func viewDidLoad() {
super.viewDidLoad()
DispatchQueue.main.async {
let settings = RenderSettings()
let imageAnimator = ImageAnimator(renderSettings: settings,imagearr: self.images)
imageAnimator.render() {
self.displayVideo()
}
}
}
func displayVideo()
{
let u:String=tempurl
let player = AVPlayer(url: URL(fileURLWithPath: u))
let playerController = AVPlayerViewController()
playerController.player = player
self.addChild(playerController)
videoview.addSubview(playerController.view)
playerController.view.frame.size=(videoview.frame.size)
playerController.view.contentMode = .scaleAspectFit
playerController.view.backgroundColor=UIColor.clear
videoview.backgroundColor=UIColor.clear
player.play()
}
@IBAction func save(_ sender: UIBarButtonItem) {
PHPhotoLibrary.requestAuthorization { status in
guard status == .authorized else { return }
let u:String=tempurl
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: URL(fileURLWithPath: u) as URL)
}) { success, error in
if !success {
print("Could not save video to photo library:", error!)
}
}
}
}
}
struct RenderSettings {
var width: CGFloat = 1500
var height: CGFloat = 844
var fps: Int32 = 2 // 2 frames per second
var avCodecKey = AVVideoCodecType.h264
var videoFilename = "renderExportVideo"
var videoFilenameExt = "mp4"
var size: CGSize {
return CGSize(width: width, height: height)
}
var outputURL: NSURL {
let fileManager = FileManager.default
if let tmpDirURL = try? fileManager.url(for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: true) {
return tmpDirURL.appendingPathComponent(videoFilename).appendingPathExtension(videoFilenameExt) as NSURL
}
fatalError("URLForDirectory() failed")
}
}
class VideoWriter {
let renderSettings: RenderSettings
var videoWriter: AVAssetWriter!
var videoWriterInput: AVAssetWriterInput!
var pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor!
var isReadyForData: Bool {
return videoWriterInput?.isReadyForMoreMediaData ?? false
}
class func pixelBufferFromImage(image: UIImage, pixelBufferPool: CVPixelBufferPool, size: CGSize) -> CVPixelBuffer {
var pixelBufferOut: CVPixelBuffer?
let status = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferPool, &pixelBufferOut)
if status != kCVReturnSuccess {
fatalError("CVPixelBufferPoolCreatePixelBuffer() failed")
}
let pixelBuffer = pixelBufferOut!
CVPixelBufferLockBaseAddress(pixelBuffer, [])
let data = CVPixelBufferGetBaseAddress(pixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: data, width: Int(size.width), height: Int(size.height),
bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue)
context!.clear(CGRect(x: 0, y: 0, width: size.width, height: size.height))
let horizontalRatio = size.width / image.size.width
let verticalRatio = size.height / image.size.height
let aspectRatio = min(horizontalRatio, verticalRatio) // ScaleAspectFit
let newSize = CGSize(width: image.size.width * aspectRatio, height: image.size.height * aspectRatio)
let x = newSize.width < size.width ? (size.width - newSize.width) / 2 : 0
let y = newSize.height < size.height ? (size.height - newSize.height) / 2 : 0
context!.concatenate(CGAffineTransform.identity)
context!.draw(image.cgImage!, in: CGRect(x: x, y: y, width: newSize.width, height: newSize.height))
CVPixelBufferUnlockBaseAddress(pixelBuffer, [])
return pixelBuffer
}
init(renderSettings: RenderSettings) {
self.renderSettings = renderSettings
}
func start() {
let avOutputSettings: [String: AnyObject] = [
AVVideoCodecKey: renderSettings.avCodecKey as AnyObject,
AVVideoWidthKey: NSNumber(value: Float(renderSettings.width)),
AVVideoHeightKey: NSNumber(value: Float(renderSettings.height))
]
func createPixelBufferAdaptor() {
let sourcePixelBufferAttributesDictionary = [
kCVPixelBufferPixelFormatTypeKey as String: NSNumber(value: kCVPixelFormatType_32ARGB),
kCVPixelBufferWidthKey as String: NSNumber(value: Float(renderSettings.width)),
kCVPixelBufferHeightKey as String: NSNumber(value: Float(renderSettings.height))
]
pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput,
sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
}
func createAssetWriter(outputURL: NSURL) -> AVAssetWriter {
guard let assetWriter = try? AVAssetWriter(outputURL: outputURL as URL, fileType: AVFileType.mp4) else {
fatalError("AVAssetWriter() failed")
}
guard assetWriter.canApply(outputSettings: avOutputSettings, forMediaType: AVMediaType.video) else {
fatalError("canApplyOutputSettings() failed")
}
return assetWriter
}
videoWriter = createAssetWriter(outputURL: renderSettings.outputURL)
videoWriterInput = AVAssetWriterInput(mediaType: AVMediaType.video, outputSettings: avOutputSettings)
if videoWriter.canAdd(videoWriterInput) {
videoWriter.add(videoWriterInput)
}
else {
fatalError("canAddInput() returned false")
}
createPixelBufferAdaptor()
if videoWriter.startWriting() == false {
fatalError("startWriting() failed")
}
videoWriter.startSession(atSourceTime: CMTime.zero)
precondition(pixelBufferAdaptor.pixelBufferPool != nil, "nil pixelBufferPool")
}
func render(appendPixelBuffers: @escaping (VideoWriter)->Bool, completion: @escaping ()->Void) {
precondition(videoWriter != nil, "Call start() to initialze the writer")
let queue = DispatchQueue(label: "mediaInputQueue")
videoWriterInput.requestMediaDataWhenReady(on: queue) {
let isFinished = appendPixelBuffers(self)
if isFinished {
self.videoWriterInput.markAsFinished()
self.videoWriter.finishWriting() {
DispatchQueue.main.async {
completion()
}
}
}
else {
}
}
}
func addImage(image: UIImage, withPresentationTime presentationTime: CMTime) -> Bool {
precondition(pixelBufferAdaptor != nil, "Call start() to initialze the writer")
let pixelBuffer = VideoWriter.pixelBufferFromImage(image: image, pixelBufferPool: pixelBufferAdaptor.pixelBufferPool!, size: renderSettings.size)
return pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: presentationTime)
}
}
class ImageAnimator{
static let kTimescale: Int32 = 600
let settings: RenderSettings
let videoWriter: VideoWriter
var images: [UIImage]!
var frameNum = 0
class func removeFileAtURL(fileURL: NSURL) {
do {
try FileManager.default.removeItem(atPath: fileURL.path!)
}
catch _ as NSError {
//
}
}
init(renderSettings: RenderSettings,imagearr: [UIImage]) {
settings = renderSettings
videoWriter = VideoWriter(renderSettings: settings)
images = imagearr
}
func render(completion: @escaping ()->Void) {
// The VideoWriter will fail if a file exists at the URL, so clear it out first.
ImageAnimator.removeFileAtURL(fileURL: settings.outputURL)
videoWriter.start()
videoWriter.render(appendPixelBuffers: appendPixelBuffers) {
let s:String=self.settings.outputURL.path!
tempurl=s
completion()
}
}
func appendPixelBuffers(writer: VideoWriter) -> Bool {
let frameDuration = CMTimeMake(value: Int64(ImageAnimator.kTimescale / settings.fps), timescale: ImageAnimator.kTimescale)
while !images.isEmpty {
if writer.isReadyForData == false {
return false
}
let image = images.removeFirst()
let presentationTime = CMTimeMultiply(frameDuration, multiplier: Int32(frameNum))
let success = videoWriter.addImage(image: image, withPresentationTime: presentationTime)
if success == false {
fatalError("addImage() failed")
}
frameNum=frameNum+1
}
return true
}
}
func saveVideoToLibrary(videoURL: URL) {
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoURL)
}) { saved, error in
if let error = error {
print("Error saving video to librayr: \(error.localizedDescription)")
}
if saved {
print("Video save to library")
}
}
}
func buildVideoFromImageArray(framesArray:[UIImage]) {
var images = framesArray
let outputSize = CGSize(width:images[0].size.width, height: images[0].size.height)
let fileManager = FileManager.default
let urls = fileManager.urls(for: .cachesDirectory, in: .userDomainMask)
guard let documentDirectory = urls.first else {
fatalError("documentDir Error")
}
let videoOutputURL = documentDirectory.appendingPathComponent("OutputVideo.mp4")
if FileManager.default.fileExists(atPath: videoOutputURL.path) {
do {
try FileManager.default.removeItem(atPath: videoOutputURL.path)
} catch {
fatalError("Unable to delete file: \(error) : \(#function).")
}
}
guard let videoWriter = try? AVAssetWriter(outputURL: videoOutputURL, fileType: AVFileType.mp4) else {
fatalError("AVAssetWriter error")
}
let outputSettings = [AVVideoCodecKey : AVVideoCodecType.h264, AVVideoWidthKey : NSNumber(value: Float(outputSize.width)), AVVideoHeightKey : NSNumber(value: Float(outputSize.height))] as [String : Any]
guard videoWriter.canApply(outputSettings: outputSettings, forMediaType: AVMediaType.video) else {
fatalError("Negative : Can't apply the Output settings...")
}
let videoWriterInput = AVAssetWriterInput(mediaType: AVMediaType.video, outputSettings: outputSettings)
let sourcePixelBufferAttributesDictionary = [
kCVPixelBufferPixelFormatTypeKey as String : NSNumber(value: kCVPixelFormatType_32ARGB),
kCVPixelBufferWidthKey as String: NSNumber(value: Float(outputSize.width)),
kCVPixelBufferHeightKey as String: NSNumber(value: Float(outputSize.height))
]
let pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
if videoWriter.canAdd(videoWriterInput) {
videoWriter.add(videoWriterInput)
}
if videoWriter.startWriting() {
videoWriter.startSession(atSourceTime: CMTime.zero)
assert(pixelBufferAdaptor.pixelBufferPool != nil)
let media_queue = DispatchQueue(__label: "mediaInputQueue", attr: nil)
videoWriterInput.requestMediaDataWhenReady(on: media_queue, using: { () -> Void in
let fps: Int32 = 30//2
let frameDuration = CMTimeMake(value: 1, timescale: fps)
var frameCount: Int64 = 0
var appendSucceeded = true
while (!images.isEmpty) {
if (videoWriterInput.isReadyForMoreMediaData) {
let nextPhoto = images.remove(at: 0)
let lastFrameTime = CMTimeMake(value: frameCount, timescale: fps)
let presentationTime = frameCount == 0 ? lastFrameTime : CMTimeAdd(lastFrameTime, frameDuration)
var pixelBuffer: CVPixelBuffer? = nil
let status: CVReturn = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pixelBufferAdaptor.pixelBufferPool!, &pixelBuffer)
if let pixelBuffer = pixelBuffer, status == 0 {
let managedPixelBuffer = pixelBuffer
CVPixelBufferLockBaseAddress(managedPixelBuffer, [])
let data = CVPixelBufferGetBaseAddress(managedPixelBuffer)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: data, width: Int(outputSize.width), height: Int(outputSize.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(managedPixelBuffer), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue)
context?.clear(CGRect(x: 0, y: 0, width: outputSize.width, height: outputSize.height))
let horizontalRatio = CGFloat(outputSize.width) / nextPhoto.size.width
let verticalRatio = CGFloat(outputSize.height) / nextPhoto.size.height
let aspectRatio = min(horizontalRatio, verticalRatio) // ScaleAspectFit
let newSize = CGSize(width: nextPhoto.size.width * aspectRatio, height: nextPhoto.size.height * aspectRatio)
let x = newSize.width < outputSize.width ? (outputSize.width - newSize.width) / 2 : 0
let y = newSize.height < outputSize.height ? (outputSize.height - newSize.height) / 2 : 0
context?.draw(nextPhoto.cgImage!, in: CGRect(x: x, y: y, width: newSize.width, height: newSize.height))
CVPixelBufferUnlockBaseAddress(managedPixelBuffer, [])
appendSucceeded = pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: presentationTime)
frameCount += 1
} else {
print("Failed to allocate pixel buffer")
appendSucceeded = false
}
}
if !appendSucceeded {
break
}
//frameCount += 1
}
videoWriterInput.markAsFinished()
videoWriter.finishWriting { () -> Void in
print("Done saving")
self.saveVideoToLibrary(videoURL: videoOutputURL)
}
})
}
}