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96d98a24fc
These tests show the current behaviour:
1. Without customization: not seekable
2. With 'enable CBR' flag:
* File length known: seekable but duration very incorrect
* File length unknown: not seekable (even though the Xing frame
contains the number of bytes in the mp3 stream).
Follow-up test changes will:
1. Add a test for the cbr-always case for this file (branched from the
files submitted in this change).
2. Add a new similar test asset with no ToC but with trailing garbage
bytes, to verify that the length from the Xing frame is used.
Then follow-up implementation changes will update Mp3Extractor to use
duration and byte length from a Xing frame when falling back to CBR
seeking.
Issue: androidx/media#2194
PiperOrigin-RevId: 734164879