Allow to retrieving number of dropped frames / duration from the exoplayer instance when SkipSilence audio processor is used

[theboubougne]

[REQUIRED] Use case description

I'm currently using the Skip silence audio processor but I'm unable to retrieve the number of dropped frames from the exoplayer instance.
This would be a nice feature to provide stats and feedback to the user

Proposed solution

Maybe adding a new callback in AnalyticsListener could be a solution

Alternatives considered

Duplicating the Skip Silence Audio processor to then add it to the RenderedFactory can work, but it's not ideal

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[andrewlewis]

Just duplicating the SilenceSkippingAudioProcessor likely won't work because the player position needs to account for the skipped frame count. It should work to inject a DefaultAudioProcessorChain to DefaultAudioSink and access its skipped output frame count, but this is not very convenient as you need to know the audio format and the getter needs to be called on the playback thread.

[andrewlewis]

How would you envisage a listener callback for this would work? It seems it might make more sense to have this work via DecoderCounters, or in the same way. I'll mark this as a low priority enhancement for now as it's unlikely we will get round to it soon.