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20b746bee5
The current implementation for parsing artist metadata in `ncmMetaMusic.GetArtists` does not handle cases where the "artist" JSON field is a list containing mixed-type inner lists.
For certain NCM files (often those with FLAC format), the artist data is structured as `[["Artist Name", 12345]]`. The existing type assertion for `[][]string` fails for this structure because the inner slice is of type `[]interface{}`, not `[]string`. This results in the artist metadata being dropped during the conversion process.
This commit enhances the `GetArtists` method by adding a new case to the `type switch` to specifically handle the `[]interface{}` type. The new logic iterates through the nested structure and correctly extracts the artist name, which is assumed to be the first string element in each inner slice.
This fix improves compatibility with a wider range of NCM files and ensures artist metadata is reliably parsed, preventing data loss for affected files.