Hi, Is it possible for you to compile flac/metaflac yourself? Then you'll only need to remove a few lines, namely these 4: https://github.com/xiph/flac/blob/28e4f0528c76b296c561e922ba67d43751990599/src/libFLAC/stream_decoder.c#L2118-L2121 and these 7: https://github.com/xiph/flac/blob/28e4f0528c76b296c561e922ba67d43751990599/src/libFLAC/stream_decoder.c#L2141-L2147 As you can see these lines are also disabled on fuzzing.
I think providing an API function and flac+metaflac command line option is going to be confusing and they will probably be misused. A compile time option might be possible though, libogg provides that too. Kind regards, Martijn van Beurden Op do 29 jun. 2023 22:28 schreef Manuel Bertsch <malu.bert...@gmail.com>: > Hello all, > > > > I’m trying to use flac and metaflac as tooling to analyze the generated > FLAC files of a new encoder implementation. However, while my own > third-party decoder can handle the output just fine, flac, metaflac, and > other tools discard the output since the frame checksum (footer CRC-16) is > invalid. This is expected, since I have no checksum generation implemented > apart from the frame header checksum (all other checksums are written as > 0), but it prevents me from making development process without being able > to check my outputs against the reference implementation. I looked around > and I couldn’t find a way to turn off either tool’s checksum verification. > So I’d like to know how one could turn off checksum verification in the > tools, and if that’s not currently possible, I’d like to see that as a > feature in a future version of flac. (In that case I would also try to > disable the checks in code permanently, though my solution is most likely > not going to be upstreamable in any capacity.) > > > > FYI, the third-party decoder is highly compliant according to the spec > test suite, producing identical audio playback on almost all of the files, > but it also doesn’t verify or error on any checksums. ffplay and ffmpeg > both accept the file and can play and transcode it correctly, although they > ignore the sample count in the streaminfo header and will read all frames > they can find. The latter leads me to believe that checksums are the actual > issue, even though flac reports the generic “Bad Header” and “Lost Sync”. > > > > Greetings and thanks in advance, > > > > Kleines Filmröllchen > _______________________________________________ > flac-dev mailing list > flac-dev@xiph.org > http://lists.xiph.org/mailman/listinfo/flac-dev >
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