前言
最近遇到需要将gif转化为mp4的问题，网上找的在线转换限制太多，索性就自己写了一个工具APP。文章末尾有开源代码和打包好的APP，如有需要请自行下载。
效果图
效果图.gif
核心代码
来源
import ImageIO
#if os(iOS)
import MobileCoreServices
#elseif os(OSX)
import CoreServices
#endif
class GIF {
private let frameDelayThreshold = 0.02
private(set) var duration = 0.0
private(set) var imageSource: CGImageSource!
private(set) var frames: [CGImage?]!
private(set) lazy var frameDurations = [TimeInterval]()
var size: CGSize {
guard let f = frames.first, let cgImage = f else { return .zero }
return CGSize(width: cgImage.width, height: cgImage.height)
}
private lazy var getFrameQueue: DispatchQueue = DispatchQueue(label: "gif.frame.queue", qos: .userInteractive)
init?(data: Data) {
guard let imgSource = CGImageSourceCreateWithData(data as CFData, nil), let imgType = CGImageSourceGetType(imgSource), UTTypeConformsTo(imgType, kUTTypeGIF) else {
return nil
}
self.imageSource = imgSource
let imgCount = CGImageSourceGetCount(imageSource)
frames = [CGImage?](repeating: nil, count: imgCount)
for i in 0.. CGImage? {
if index >= CGImageSourceGetCount(imageSource) {
return nil
}
if let frame = frames[index] {
return frame
} else {
let frame = CGImageSourceCreateImageAtIndex(imageSource, index, nil)
frames[index] = frame
return frame
}
}
private func getGIFFrameDuration(imgSource: CGImageSource, index: Int) -> TimeInterval {
guard let frameProperties = CGImageSourceCopyPropertiesAtIndex(imgSource, index, nil) as? [String: Any],
let gifProperties = frameProperties[kCGImagePropertyGIFDictionary as String] as? NSDictionary,
let unclampedDelay = gifProperties[kCGImagePropertyGIFUnclampedDelayTime] as? TimeInterval
else { return 0.02 }
var frameDuration = TimeInterval(0)
if unclampedDelay < 0 {
frameDuration = gifProperties[kCGImagePropertyGIFDelayTime] as? TimeInterval ?? 0.0
} else {
frameDuration = unclampedDelay
}
/* Implement as Browsers do: Supports frame delays as low as 0.02 s, with anything below that being rounded up to 0.10 s.
http://nullsleep.tumblr.com/post/16524517190/animated-gif-minimum-frame-delay-browser-compatibility */
if frameDuration < frameDelayThreshold - Double.ulpOfOne {
frameDuration = 0.1
}
return frameDuration
}
}
#if os(iOS)
import UIKit
#elseif os(OSX)
import Cocoa
#endif
import Foundation
import AVFoundation
class GIF2MP4 {
private(set) var gif: GIF
private var outputURL: URL!
private(set) var videoWriter: AVAssetWriter!
private(set) var videoWriterInput: AVAssetWriterInput!
private(set) var pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor!
var videoSize: CGSize {
//The size of the video must be a multiple of 16
return CGSize(width: max(1, floor(gif.size.width / 16)) * 16, height: max(1, floor(gif.size.height / 16)) * 16)
}
init?(data: Data) {
guard let gif = GIF(data: data) else { return nil }
self.gif = gif
}
private func prepare() {
try? FileManager.default.removeItem(at: outputURL)
let avOutputSettings: [String: Any] = [
AVVideoCodecKey: AVVideoCodecType.h264,
AVVideoWidthKey: NSNumber(value: Float(videoSize.width)),
AVVideoHeightKey: NSNumber(value: Float(videoSize.height))
]
let sourcePixelBufferAttributesDictionary = [
kCVPixelBufferPixelFormatTypeKey as String: NSNumber(value: kCVPixelFormatType_32ARGB),
kCVPixelBufferWidthKey as String: NSNumber(value: Float(videoSize.width)),
kCVPixelBufferHeightKey as String: NSNumber(value: Float(videoSize.height))
]
videoWriter = try! AVAssetWriter(outputURL: outputURL, fileType: AVFileType.mp4)
videoWriterInput = AVAssetWriterInput(mediaType: AVMediaType.video, outputSettings: avOutputSettings)
videoWriter.add(videoWriterInput)
pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoWriterInput, sourcePixelBufferAttributes: sourcePixelBufferAttributesDictionary)
videoWriter.startWriting()
videoWriter.startSession(atSourceTime: CMTime.zero)
}
func convertAndExport(to url: URL, completion: @escaping (Bool) -> Void ) {
outputURL = url
prepare()
var index = 0
var delay = 0.0 - gif.frameDurations[0]
let queue = DispatchQueue(label: "mediaInputQueue")
videoWriterInput.requestMediaDataWhenReady(on: queue) {
var isFinished = true
var isSuccess = true
while index < self.gif.frames.count {
if self.videoWriterInput.isReadyForMoreMediaData == false {
isFinished = false
break
}
if let cgImage = self.gif.getFrame(at: index) {
let frameDuration = self.gif.frameDurations[index]
delay += Double(frameDuration)
let presentationTime = CMTime(seconds: delay, preferredTimescale: 600)
let result = self.addImage(image: cgImage, withPresentationTime: presentationTime)
if result == false {
isSuccess = false
break
} else {
index += 1
}
}
}
if isFinished {
self.videoWriterInput.markAsFinished()
self.videoWriter.finishWriting {
DispatchQueue.main.async {
completion(isSuccess)
}
}
} else {
// Fall through. The closure will be called again when the writer is ready.
}
}
}
private func addImage(image: CGImage, withPresentationTime presentationTime: CMTime) -> Bool {
guard let pixelBufferPool = pixelBufferAdaptor.pixelBufferPool else {
print("pixelBufferPool is nil ")
return false
}
let pixelBuffer = pixelBufferFromImage(image: image, pixelBufferPool: pixelBufferPool, size: videoSize)
return pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: presentationTime)
}
private func pixelBufferFromImage(image: CGImage, 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, CVPixelBufferLockFlags(rawValue: CVOptionFlags(0)))
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 / CGFloat(image.width)
let verticalRatio = size.height / CGFloat(image.height)
let aspectRatio = max(horizontalRatio, verticalRatio) // ScaleAspectFill
//let aspectRatio = min(horizontalRatio, verticalRatio) // ScaleAspectFit
let newSize = CGSize(width: CGFloat(image.width) * aspectRatio, height: CGFloat(image.height) * aspectRatio)
let x = newSize.width < size.width ? (size.width - newSize.width) / 2: -(newSize.width-size.width)/2
let y = newSize.height < size.height ? (size.height - newSize.height) / 2: -(newSize.height-size.height)/2
context.draw(image, in: CGRect(x: x, y: y, width: newSize.width, height: newSize.height))
CVPixelBufferUnlockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: CVOptionFlags(0)))
return pixelBuffer
}
}
使用步骤
- 打开APP
- 将
gif拖拽到窗口中
常见问题
macos 10.15 将对您的电脑造成伤害，您应该将它移到废纸篓
- APP右键-显示简介-覆盖恶意软件保护 打勾
- 打开终端
codesign -f -s - --deep /Applications/appname.app
总结
代码支持iOS和macOS
下载地址----->>>GIF2MP4，如果对你有所帮助，欢迎Star。