Enable multiple calls to _setup() method

[joaopaulovieira]

Summary

Currently, if the _setup() is called after the playback is ready/started to play, one error (code 3015) occurs when the setInterval loop on _startTimeUpdateTimer method tries to update the current time of the old shaka-player instance in the time interval between the _setup method is called and one new shaka-player instance is created.

This PR guarantees the delete of the old shaka-player instance (if exists) before the creation of the new one.

Changes

• Extracted code to initial config into one new method (_setInitialConfig);
• Extracted code to load source into one new method (_loadSource);
• Aggregate steps to avoid code duplication (runAllSteps);
• Chained runAllSteps call with the this._player.destroy promise if this_player exists;

How to test

• Play any media;
• Config one new media;
  • E.g.: player.core.activePlayback._options.src = 'your-new-media.mpd'.
• Call _setup method;
  • The configured media should be loaded.

A picture is worth a thousand words

Before

Screen.Recording.2021-01-06.at.10.02.12.mov

After

Screen.Recording.2021-01-06.at.10.01.11.mov