Load wav file with Shift-JIS RIFF INFO chunks w/ MusicBrainz Picard

__init__.py

from picard import log
from picard.formats.wav import RiffListInfo

PLUGIN_API_VERSIONS = ["2.2"]

# trying to patch here https://github.com/metabrainz/picard/blob/4d49ac4bfb9bed3c87ddd843d81235561b3b32bd/picard/formats/wav.py#L143-L149
@staticmethod
def decode(value: bytes):
    log.debug(f"patched decoder {value}")
    try:
        value = value.decode('utf-8')
    except UnicodeDecodeError:
        value = value.decode('shift-jis')
    return value.rstrip('\0')

# https://docs.python.org/3/tutorial/classes.html#private-variables
RiffListInfo._RiffListInfo__decode_data = decode

README.md

Check Picard plugin location with https://picard-docs.musicbrainz.org/en/troubleshooting/does_not_start.html and place to subdirectory of plugins folder.

e.g. on macOS, ~/Library/Preferences/MusicBrainz/Picard/plugins/shiftjis-wav/__init__.py