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b8df8ecb47
An accumulation of several fixes: 1. Change to HlsExtractorWrapper is just a move + documentating things that were already true + adding a precondition in the configureSpliceTo method. 2. Change in HlsSampleSource.readData ensures that configureSpliceTo and hasSamples aren't called on an extractor that isn't prepared. 3. The other change in HlsSampleSource ensures the correct "previous" TsChunk is used. If a TsChunk fails to load and is replaced, the previous chunk should be the one before that whose load completed successfully. 4. Determine switchingVariantSpliced based on the actual format of the previous chunk, so it's set correctly in the case of a TsChunk load failure and subsequent replacement.