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a51ec04adf
Real-world xHE-AAC streams and the ISO/IEC 23003-3 conformance sequences carry their loudness metadata exclusively as loudnessInfoV1() inside loudnessInfoSetExtension(), which was previously rejected with AVERROR_PATCHWELCOME, making such streams undecodable and loudness normalization inoperative on them. loudnessInfoV1() is identical to loudnessInfo() apart from an added eqSetId field. Parse it, restrict measurement selection to eqSetId == 0 (in line with the downmixId/drcSetId restrictions), and skip unknown loudnessInfoSetExtension() payloads using their explicitly coded size instead of erroring out.