Question

如何根据网管中的网速从视频网址获取视频分辨率它使用Exo播放器自动获得128 p，360 p。

Answer 1

我建议你在这里参考，这里是代码内容。如果这不是你要找的东西，请忽略这个答案。

您想要查看的核心点是轨道选择（通过TrackSelector）以及TrackSelectionHelper。我将在下面列出重要的代码示例，希望这些示例足以让您前进。但最终只需在演示应用程序中执行类似操作即可获得所需的位置。

您将保持启动播放器的轨道选择器，并将其用于几乎所有内容。

以下只是一段代码，理想地涵盖了您尝试做的事情的要点，因为演示看起来似乎使头发过于复杂。此外，我还没有运行代码，但它足够接近。

    // These two could be fields OR passed around
    int videoRendererIndex;
    TrackGroupArray trackGroups;

    // This is the body of the logic for see if there are even video tracks
    // It also does some field setting
    MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
    for (int i = 0; i < mappedTrackInfo.length; i++) {
      TrackGroupArray trackGroups = mappedTrackInfo.getTrackGroups(i);
      if (trackGroups.length != 0) {
        switch (player.getRendererType(i)) {
          case C.TRACK_TYPE_VIDEO:
            videoRendererIndex = i;
            return true;
        }
      }
    }

    // This next part is actually about getting the list. It doesn't include
    // some additional logic they put in for adaptive tracks (DASH/HLS/SS),
    // but you can look at the sample for that (TrackSelectionHelper#buildView())
    // Below you'd be building up items in a list. This just does
    // views directly, but you could just have a list of track names (with indexes)
    for (int groupIndex = 0; groupIndex < trackGroups.length; groupIndex++) {
      TrackGroup group = trackGroups.get(groupIndex);
      for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
        if (trackIndex == 0) {
          // Beginning of a new set, the demo app adds a divider
        }
        CheckedTextView trackView = ...; // The TextView to show in the list
        // The below points to a util which extracts the quality from the TrackGroup
        trackView.setText(DemoUtil.buildTrackName(group.getFormat(trackIndex)));
    }

    // Assuming you tagged the view with the groupIndex and trackIndex, you
    // can build your override with that info.
    Pair<Integer, Integer> tag = (Pair<Integer, Integer>) view.getTag();
    int groupIndex = tag.first;
    int trackIndex = tag.second;
    // This is the override you'd use for something that isn't adaptive.
    override = new SelectionOverride(FIXED_FACTORY, groupIndex, trackIndex);
    // Otherwise they call their helper for adaptives, which roughly does:
    int[] tracks = getTracksAdding(override, trackIndex);
    TrackSelection.Factory factory = tracks.length == 1 ? FIXED_FACTORY : adaptiveTrackSelectionFactory;
    override = new SelectionOverride(factory, groupIndex, tracks);

    // Then we actually set our override on the selector to switch the quality/track
    selector.setSelectionOverride(rendererIndex, trackGroups, override);

在ExoPlayer中获取视频分辨率

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