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Add possibility to filter and reorder key systems prioritization order at application level

Vinay Rosenberg requested to merge github/fork/Orange-OpenSource/set-key-systems into development

Created by: bbert

This PR:

  • adds a method to the ProtectionController to enable filtering and reorder key systems prioritization at application level
  • reverts PR #2770 and then PR #2318 by considering all key systems declared in mpd (even if no pssh is provided)

This PR follows the conversation we have in issue #2249 (closed). Then with the help of this PR, ClearKey protected content mentionned in #2249 (closed) can be supported by dash.js if we do explicitely consider only ClearKey key systems at application level.

This could be achieved this way:

    var keySystems = player.getProtectionController().getKeySystems();
    keySystems = keySystems.filter(keySystem => {
        return (keySystem.systemString.indexOf('clearkey') > 0);
    });
    player.getProtectionController().setKeySystems(keySystems);

@JohnIball and @Murmur could you try this PR on your side and check that works with your streams.

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