olly e606893ff8 Create a SampleDataReader interface for TrackOutput.sampleData().
Modify TrackOutput.sampleData() to accept SampleDataReader instead of ExtractorInput. SampleDataReader supports only read and skip calls, which all sampleData() implementations already restrict themselves to.

PiperOrigin-RevId: 294905155
2020-02-13 15:46:13 +00:00
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