Broken with libFLAC < 1.4.0 ("internal psf_fseek() failed")

Some versions of the SoundFile package on PyPI, including the latest version (0.12.1), appear to be broken. It appears that something is wrong with the precompiled "libsndfile_x86_64.so". I have no idea about other platforms. I don't know if this is actually a bug in libFLAC, or in libsndfile, or in SoundFile, or a bug in how libFLAC/libsndfile was compiled.

The latest version in the libsndfile-binaries repo is possibly fixed, but there hasn't been a new release of SoundFile for a while.

Here is an example file, gzipped and base64ed:
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I think this is a valid FLAC file, though I'm not sure. Running python3 -c 'import soundfile; soundfile.SoundFile("example.dat").read(78419)' should succeed.

• With python3-soundfile (and libsndfile) from Debian bookworm, it works.
• With libsndfile_x86_64.so from commit f5311e9 (md5 = 8e42bd39f38254cf9a5c8ad1bc975faa), it fails.
• With libsndfile_x86_64.so from commit 1ddbbd5 (md5 = 44c0cbf5b8f2a96d309d3e648718bdec), it fails.
• With libsndfile_x86_64.so from commit f1655ba (md5 = 1bd1cc5a1b3724c97ea26d007110e5f1), it works.
• With libsndfile_x86_64.so from commit 42c638d (md5 = 243f680f7a517539fe867731fc5fd5d0), it works.

埋め込まれた example.dat データと文書化された SoundFile コマンドを使って、まず失敗を再現します。その際、記載されている libsndfile_x86_64.so のコミットと Debian の libsndfile を比較します。欠陥が libFLAC、libsndfile、SoundFile のパッケージング、またはコンパイルのどこにあるのかを特定します。リリース済みパッケージで example FLAC を正常に読み込めれば完了です。