Audio AdaptationSet preference based on AudioChannelConfiguration

[japettyjohn]

When playing file with multiple audio AdaptatioSets with different AudioChannelConfiguration to support stereo and surround dashjs appears to choose surround on computers with two speakers as long as the surround codec is support. As it's AAC stereo and E-AC-3 surround this only happens on browsers that support E-AC-3 (e.g. Safari). I'm using dash.js 3.0 using videojs 7.5.5.

This is similar to what I brought up in #3022 but in the case of audio it needs to take into account both supported codec (which is does correctly) and the AudioChannelConfiguration.

Here's the audios from my file:

    <AdaptationSet id="0" contentType="audio" lang="en" subsegmentAlignment="true">
      <Representation id="0" bandwidth="164894" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="48000">
        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
        <BaseURL>stereo.mp4</BaseURL>
        <SegmentBase indexRange="825-6748" timescale="48000">
          <Initialization range="0-824"/>
        </SegmentBase>
      </Representation>
    </AdaptationSet>
    <AdaptationSet id="1" contentType="audio" lang="en" subsegmentAlignment="true">
      <Representation id="1" bandwidth="195858" codecs="ec-3" mimeType="audio/mp4" audioSamplingRate="48000">
        <AudioChannelConfiguration schemeIdUri="tag:dolby.com,2014:dash:audio_channel_configuration:2011" value="F801"/>
        <BaseURL>surround.mp4</BaseURL>
        <SegmentBase indexRange="771-6694" timescale="48000">
          <Initialization range="0-770"/>
        </SegmentBase>
      </Representation>
    </AdaptationSet>

[japettyjohn]

I made a sample which shows this happening using a short clip from Tears of Steel.

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