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The allocator and buffering policy (e.g. how large the buffer is) is moving to the top level as part of playlist support, so it no longer makes sense to inject these parameters as args into ExtractorSampleSource's constructor. Instantiating the allocator and buffer size inside of the source is temporary and only until they're moved up. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=123968976