QML 媒体播放器不显示 mp3 流的元数据

Question

给定以下代码：

Item {
   id: mainPage
   anchors.fill: parent

   function getMetaData(metaData) {
         var text = ""

         text += "title: " + metaData.title + "\n"
         text += "subTitle: " + metaData.subTitle + "\n"
         text += "author: " + metaData.author + "\n"
         text += "comment: " + metaData.comment + "\n"
         text += "description: " + metaData.description + "\n"
         text += "category: " + metaData.category + "\n"
         text += "genre: " + metaData.genre + "\n"
         text += "language: " + metaData.language + "\n"
         text += "albumTitle: " + metaData.albumTitle + "\n"
         text += "albumArtist: " + metaData.albumArtist + "\n"
         text += "coverArtUrlSmall: " + metaData.coverArtUrlSmall + "\n"
         text += "coverArtUrlLarge: " + metaData.coverArtUrlLarge + "\n"
         text += "posterUrl: " + metaData.posterUrl + "\n"

      return text
   }

   MediaPlayer {
      id: audioPlayer
      audioRole: MusicRole
      source:      "https://s3-webradio.antenne.de/antenne/stream/mp3?aw_0_1st.playerid=radio.de"
      //source: "https://swr-swr3-live.cast.addradio.de/swr/swr3/live/mp3/128/stream.mp3"
      //source: "http://bob.hoerradar.de/radiobob-hartesaite-mp3-hq?sABC=5r65511s%230%23os634o21s23sr4751opp80560p2o2sr6%23fgernzf.enqvbobo.qr&amsparams=playerid:streams.radiobob.de;skey:1583698207"

      onPlaybackStateChanged: {
         console.log("State: " + audioPlayer.status + " Meta data: \n" + getMetaData(audioPlayer.metaData));
      }
   }
}

我试过的音频流都可以正常播放。但是我无法检索流的元数据。例如。标题、艺术家等。所有元字段都将只是“未定义”。

我试过几个流，none 会显示任何元数据。但我确信流会提供这些信息，因为其他播放器应用程序会显示标题、艺术家等。

我尝试了其他方法（如 here），但我仍然没有得到任何元数据。

我正在 ubuntu 触摸，如果这很重要，应用装甲策略是 ["audio", "networking"]（也尝试过 music_files_read，但没有帮助）。

谁能帮帮我？

Answer 1

你忘记了一些小事：

1.audioRole: MediaPlayer.MusicRole

2. mainPage.getMetaData(audioPlayer.metaData));你应该调用mainPage id然后调用它的函数

这里是正确的代码：

Item {
    id: mainPage
    anchors.fill: parent

    function getMetaData(metaData) {
        var text = ""

        text += "title: " + metaData.title + "\n"
        text += "subTitle: " + metaData.subTitle + "\n"
        text += "author: " + metaData.author + "\n"
        text += "comment: " + metaData.comment + "\n"
        text += "description: " + metaData.description + "\n"
        text += "category: " + metaData.category + "\n"
        text += "genre: " + metaData.genre + "\n"
        text += "language: " + metaData.language + "\n"
        text += "albumTitle: " + metaData.albumTitle + "\n"
        text += "albumArtist: " + metaData.albumArtist + "\n"
        text += "coverArtUrlSmall: " + metaData.coverArtUrlSmall + "\n"
        text += "coverArtUrlLarge: " + metaData.coverArtUrlLarge + "\n"
        text += "posterUrl: " + metaData.posterUrl + "\n"

        return text
    }


    MediaPlayer {
        id: audioPlayer
        audioRole: MediaPlayer.MusicRole
        source:      "https://s3-webradio.antenne.de/antenne/stream/mp3?aw_0_1st.playerid=radio.de"
        //source: "https://swr-swr3-live.cast.addradio.de/swr/swr3/live/mp3/128/stream.mp3"
        //source: "http://bob.hoerradar.de/radiobob-hartesaite-mp3-hq?sABC=5r65511s%230%23os634o21s23sr4751opp80560p2o2sr6%23fgernzf.enqvbobo.qr&amsparams=playerid:streams.radiobob.de;skey:1583698207"

        metaData.onMetaDataChanged: {
            console.log("State: " + audioPlayer.status + " Meta data: \n" + mainPage.getMetaData(audioPlayer.metaData));
        }
    }



}

这是输出：

正如您在这张图片中看到的那样 genre: Pop

我测试了来自 this site 的另一首音乐并打印了另一个元数据，未定义意味着源没有此元数据。

QML 媒体播放器不显示 mp3 流的元数据

QML mediaplayer does not show metaData for mp3 streams

qt

qml

metadata

media-player

audio-streaming