Write FLAC STREAMINFO MD5 checksum#906
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Signed-off-by: Patryk Miś <foss@patrykmis.com>
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This updates the FLAC container finalization path to write the STREAMINFO MD5 checksum of the unencoded PCM audio data, as specified by FLAC.
The implementation adds a small optional hook for containers that need metadata derived from encoder input samples.
FlacContaineruses it to track the exact interchannel sample count and MD5 digest of the same PCM bytes submitted toMediaCodec.This keeps the existing crash-resilient behavior: encoded FLAC frames are still written to disk as they are produced, and the STREAMINFO patch is only a finalization step for cleanly closed recordings.
It also replaces the previous EOF presentation timestamp based duration calculation with an exact sample count derived from the PCM input, avoiding small rounding/under-counting errors in the STREAMINFO total samples field.