如何从swift/AVKIT中的HLS流读取id3标记/其他元数据
我试图收集一些关于如何在iOS应用程序中从HLS流读取元数据的知识。 下面的HLS流有一些我想读取的ID3标记: 在Safari的web inspector中,我可以在控制台中看到许多数据对象,每个对象都有元数据: 在web inspector的“网络”选项卡中,我可以读取播放列表文件:如何从swift/AVKIT中的HLS流读取id3标记/其他元数据,swift,avplayer,http-live-streaming,id3,m3u8,Swift,Avplayer,Http Live Streaming,Id3,M3u8,我试图收集一些关于如何在iOS应用程序中从HLS流读取元数据的知识。 下面的HLS流有一些我想读取的ID3标记: 在Safari的web inspector中,我可以在控制台中看到许多数据对象,每个对象都有元数据: 在web inspector的“网络”选项卡中,我可以读取播放列表文件: #EXTM3U #EXT-X-VERSION:5 #EXT-X-MEDIA-SEQUENCE:89147 #EXT-X-TARGETDURATION:20 #EXT-X-PROGRAM-DATE-TIME:
#EXTM3U
#EXT-X-VERSION:5
#EXT-X-MEDIA-SEQUENCE:89147
#EXT-X-TARGETDURATION:20
#EXT-X-PROGRAM-DATE-TIME:2019-09-25T11:35:23.401Z
#EXTINF:19.970,
05-20190925T113523Z.aac
#EXTINF:19.970,
05-20190925T113543Z.aac
#EXTINF:19.970,
05-20190925T113603Z.aac
#EXTINF:19.970,
05-20190925T113623Z.aac
#EXTINF:19.970,
05-20190925T113643Z.aac
#EXTINF:19.970,
05-20190925T113703Z.aac
到目前为止,我已经实现了一个类,它使用一个AVPlayer
实例来播放这个流。它工作正常
我将AVPlayer
和AVPlayerItem
中的各种属性打印到Xcode控制台。
但是,我能解释的唯一属性是AVPlayerItem.currentTime
,它给出了播放列表文件中EXT-X-PROGRAM-DATE-TIME
的值。
所有其他属性似乎与我在播放列表和id3标签中看到的信息无关
有没有办法读取每个id3标记中包含的元数据?
如何从播放列表中读取EXT-X-TARGETDURATION
我阅读了有关AVPlayerItemMetadataCollector的内容,但我不明白它应该做什么,以及这是否有助于我读取HLS流中的元数据 我就是这样做到的:
import UIKit
import AVKit
import AVFoundation
import MediaPlayer
class ViewController: UIViewController{
let player = AVPlayer()
var playerItem: AVPlayerItem!
let asset = AVAsset(url: URL(string: "https://db2.indexcom.com/bucket/ram/00/05/05.m3u8")!)
override func viewDidLoad() {
prepareToPlay()
player.play()
}
func prepareToPlay() {
playerItem = AVPlayerItem(asset: asset)
playerItem.addObserver(self, forKeyPath: "timedMetadata", options: [], context: nil)
player.replaceCurrentItem(with: playerItem)
printTimeStamp()
}
func printTimeStamp() {
print("▼⎺▼⎺▼⎺▼⎺▼⎺▼⎺▼⎺▼")
print("PROGRAM-DATE-TIME: ")
print(playerItem.currentDate() ?? "No timeStamp")
print("▲_▲_▲_▲_▲_▲_▲_▲\n\n")
}
override func observeValue(forKeyPath: String?, of: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if forKeyPath != "timedMetadata" { return }
printTimeStamp()
let data: AVPlayerItem = of as! AVPlayerItem
guard let timedMetadata = data.timedMetadata else { return }
for item in timedMetadata {
switch item.commonKey {
case .commonKeyAlbumName?:
print("AlbumName: \(item.value!)")
case .commonKeyArtist?:
print("Artist: \(item.value!)")
case .commonKeyArtwork?:
print("Artwork: \(item.value!)")
case .commonKeyAuthor?:
print("Author: \(item.value!)")
case .commonKeyContributor?:
print("Contributor: \(item.value!)")
case .commonKeyCopyrights?:
print("Copyrights: \(item.value!)")
case .commonKeyCreationDate?:
print("CreationDate: \(item.value!)")
case .commonKeyCreator?:
print("creator: \(item.value!)")
case .commonKeyDescription?:
print("Description: \(item.value!)")
case .commonKeyFormat?:
print("Format: \(item.value!)")
case .commonKeyIdentifier?:
print("Identifier: \(item.value!)")
case .commonKeyLanguage?:
print("Language: \(item.value!)")
case .commonKeyMake?:
print("Make: \(item.value!)")
case .commonKeyModel?:
print("Model: \(item.value!)")
case .commonKeyPublisher?:
print("Publisher: \(item.value!)")
case .commonKeyRelation?:
print("Relation: \(item.value!)")
case .commonKeySoftware?:
print("Software: \(item.value!)")
case .commonKeySubject?:
print("Subject: \(item.value!)")
case .commonKeyTitle?:
print("Title: \(item.value!)")
case .commonKeyType?:
print("Type: \(item.value!)")
case .id3MetadataKeyAlbumTitle?:
print("id3MetadataKeyAlbumTitle: \(item.value!)")
default:
print("other data: \(item.value!)")
}
}
}
}
我们就是这样做的:-欢迎您复制或使用我们的库:-)