Custom attributes

[iDevelopper]

Thanks for this great decoder!

However, I'm looking for the best way to decode an m3u8 file like the one below, to recover all the attributes of EXTINF if they exist.

Thank you for your help.

#EXTM3U
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:171115544
#EXTINF:10,title="The Ben Maller Show",artist="zc4732",url="song_spot=\"T\" spotInstanceId=\"-1\" length=\"04:00:00\" MediaBaseId=\"\" TAID=\"0\" TPID=\"0\" cartcutId=\"\" amgArtworkURL=\"https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/cff92185-5e92-11ec-9478-8bbc72f158cb/logo\" spEventID=\"01f47968-ccac-11ee-a9cf-f50937f44113\" "
https://n0ab-e2.revma.ihrhls.com/zc4732/10_sz0pexjzvq8g02/main/171115542.aac
#EXTINF:10,title="The Ben Maller Show",artist="zc4732",url="song_spot=\"T\" spotInstanceId=\"-1\" length=\"04:00:00\" MediaBaseId=\"\" TAID=\"0\" TPID=\"0\" cartcutId=\"\" amgArtworkURL=\"https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/cff92185-5e92-11ec-9478-8bbc72f158cb/logo\" spEventID=\"01f47968-ccac-11ee-a9cf-f50937f44113\" "
https://n0ab-e2.revma.ihrhls.com/zc4732/10_sz0pexjzvq8g02/main/171115543.aac
#EXTINF:10,title="The Ben Maller Show",artist="zc4732",url="song_spot=\"T\" spotInstanceId=\"-1\" length=\"04:00:00\" MediaBaseId=\"\" TAID=\"0\" TPID=\"0\" cartcutId=\"\" amgArtworkURL=\"https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/cff92185-5e92-11ec-9478-8bbc72f158cb/logo\" spEventID=\"01f47968-ccac-11ee-a9cf-f50937f44113\" "
https://n0ab-e2.revma.ihrhls.com/zc4732/10_sz0pexjzvq8g02/main/171115544.aac

[ikhvorost]

Hi @iDevelopper !

Yes, there is a bug with #EXTINF attribute e.g.:

struct EXTINF2: Decodable {
  public let duration: Double
  public let title: String
  public let artist: String
  public let url: String
}

struct Playlist: Decodable {
  let extinf: [EXTINF2]
}

let m3u8 = """
#EXTM3U
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:171115544
#EXTINF:10,title="The Ben Maller Show",artist="zc4732",url="song_spot=\"T\" spotInstanceId=\"-1\" length=\"04:00:00\" MediaBaseId=\"\" TAID=\"0\" TPID=\"0\" cartcutId=\"\" amgArtworkURL=\"https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/cff92185-5e92-11ec-9478-8bbc72f158cb/logo\" spEventID=\"01f47968-ccac-11ee-a9cf-f50937f44113\" "
https://n0ab-e2.revma.ihrhls.com/zc4732/10_sz0pexjzvq8g02/main/171115542.aac
"""

let playlist = try! M3U8Decoder().decode(Playlist.self, from: m3u8)
print(playlist.extinf[0]) 

// Prints: EXTINF2(duration: 10.0, title: "The Ben Maller Show", artist: "zc4732", url: "song_spot=")

But url must be:

song_spot=\"T\" spotInstanceId=\"-1\" length=\"04:00:00\" MediaBaseId=\"\" TAID=\"0\" TPID=\"0\" cartcutId=\"\" amgArtworkURL=\"https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/cff92185-5e92-11ec-9478-8bbc72f158cb/logo\" spEventID=\"01f47968-ccac-11ee-a9cf-f50937f44113\"

And then you are able to parse this string value manually because the library parses coma-separated attributes on the top level only.

Thanks for bug reporting.

[iDevelopper]

Okay, that's exactly what I tested and found. I'm not getting the full text for the url key.

Thank you for your response.

So are you going to fix the bug?

[ikhvorost]

Yes, the fix will be available in the next release version.

[ikhvorost]

Fixed in 1.2.0. Thanks.

[iDevelopper]

Hi @ikhvorost,

Awesome! Thanks!

Could you modify the regex attributes so that it also detects quotes (char code 39 "'"), perhaps like this:

    private static let regexAttributes = try! NSRegularExpression(pattern: "([^=,\\s]+)=((\'([^\']+)\')|(\"([^\"]+)\")|([^,]+))")

Add it to the charSetQuotes:

 private static let charSetQuotes = CharacterSet(charactersIn: "\', \"")

Take this into account in the func convertType(text: String) -> Any

        guard text.hasPrefix("\'") == false, text.hasPrefix("\"") == false, text.hasPrefix("0x") == false, text.hasPrefix("0X") == false else {
            return text.trimmingCharacters(in: Self.charSetQuotes)
        }

As I receive the url with some quotes (') (instead of ""):
// song_spot='T' spotInstanceId='-1' length='03:00:00' MediaBaseId='' TAID='0' TPID='0' cartcutId='' amgArtworkURL='https://storage.googleapis.com/portal-content.zettacloud.appspot.com/shows/c2c3b528-59f9-11ec-b000-cb602abe1056/logo\' spEventID='c550c194-daff-11ee-acde-05a5249c06b1'

And expose the function parse(attributes: String, keyValues: inout [String : Any]) to be public.