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1b71e3b40d
This change allows you to enable/disable tracks within which all samples are key-frames without any re-buffering (e.g. audio, text and metadata). This effectively reverts V2 back to the behavior in V1, only this time we're doing it properly. []ly disabling/enabling, or disabling/enabling whilst paused, no longer cause samples to get "lost" between the source and renderers. Note it also becomes really easy to support a few other things, although support is not exposed in this change: - Enable/disable video tracks without any re-buffering, by changing the toKeyframe argument passed to discardTo to true. - Retain media in the buffer for some time after it's been played (e.g. to support a single back-5s-seek efficiently), by subtracting the desired back-buffer time from the value that's passed to discardTo. Issue: #2956 Issue: #2926 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=160128586