Reset MSE when switching codec if changeType is unstable or unavailable

[matvp91]

Noticed on webOS 4, when switching audio track from one codec to another. A MEDIA_ERR_DECODE error is thrown and _handleMediaErrorDecode resets MSE. Waiting for decode error to occur is not favourable, thus introducing a new buffer setting resetSourceBuffersForTrackSwitch that resets MSE when we're switching to a new track with a different codec than the active track.

[matvp91]

@dsilhavy as discussed on Slack, BufferController occasionally throws an error where the buffer sink is undefined, probably due to a pending operation on the old SourceBuffer. To be fair, I'm not sure how to continue with this as I'm not getting the full context yet. There might also be an easier way to tear down MSE and reset that I'm unaware of.

[dsilhavy]

@matvp91 This looks good to me.

• Can you add an additional check to BufferController:

    function getRangeAt(time, tolerance) {
        if (!sourceBufferSink) {
            return null;
        }

• Please also resolve the conflicts with the current development branch

[matvp91]

@dsilhavy Got it, I'll give this some final runs on a variety of webOS devices where this applies and we're all good after that I believe. Thanks for the info!

[matvp91]

@dsilhavy tested this on a variety of webOS devices and all looks good. Guess we're good to go!