[KaktoR]

I use a similar script for pck files. Works fine until today.

# Wwise AKPK packages (.PCK) extractor
#
# v1 by Nicknine
# v2 by bnnm (old extensions, lang names, etc)


# set if cannot be autodetected: 62< uses old extensions, 62>= uses new extensions
set BANK_VERSION long 0

# set 1 to extract BNK only
set FILTER_BNK long 0

###

idstring "AKPK"

# Detect endianness
goto 0x08
get TEST long
endian guess TEST
endian save CURRENT_ENDIAN

goto 0x04
get HEADER_SIZE long # not counting padding
get FLAG long # always 1?
get SEC1_SIZE long # Languages
get SEC2_SIZE long # Banks
get SEC3_SIZE long # Sounds
set SEC4_SIZE long 0 # Externals

# Later Wwise versions (+2012) have the fourth section with "externals" (.wem set at runtime).
xmath SUM "SEC1_SIZE + SEC2_SIZE + SEC3_SIZE + 0x10" # Detect its presense.
if SUM < HEADER_SIZE
    get SEC4_SIZE long
endif

###

# Get languages
callfunction PARSE_LANGS 1
 
# Extract banks
set SECTION_SIZE SEC2_SIZE
set IS_SOUNDS long 0
set IS_EXTERNALS long 0
set EXT string "bnk"
callfunction PARSE_TABLE 1

# banks section always exists but may set 0 files = can't autodetect
if BANK_VERSION == 0
    # section 4 was added after .wem
    if SEC4_SIZE == 0
        print "can't detect bank version, assuming new (set manually)"
    endif
    math BANK_VERSION = 62
endif

# Extract sounds
set SECTION_SIZE SEC3_SIZE
set IS_SOUNDS long 1
set IS_EXTERNALS long 0
set EXT string "wem"
callfunction PARSE_TABLE 1

# Extract externals
set SECTION_SIZE SEC4_SIZE
set IS_SOUNDS long 1
set IS_EXTERNALS long 1
set EXT string "wem"
callfunction PARSE_TABLE 1

# last sound may be padding 

###

startfunction PARSE_LANGS
    savepos STRINGS_OFFSET

    get LANGS long
    for I = 0 < LANGS
        get LANG_OFFSET long
        get LANG_ID long

        math LANG_OFFSET += STRINGS_OFFSET

        savepos CURRENT

        # Language names may be stored as UTF-16 (current endian) or UTF-8
        # depending on platform + version (older = UTF-16?).
        # Detect UTF-16 by presence of null in UTF-16 chars (Wwise langs are +2 chars ASCII).

        goto LANG_OFFSET
        get TEST1 byte
        get TEST2 byte

        goto LANG_OFFSET
        if TEST1 == 0 || TEST2 == 0
            get LANG_NAME unicode
        else
            get LANG_NAME string
        endif

        # table isn't ordered by ID, but IDs are fixed (0=sfx, 1=english, etc)
        putarray 0 LANG_ID LANG_NAME
        goto CURRENT
    next I

    goto STRINGS_OFFSET
    goto SEC1_SIZE 0 SEEK_CUR

endfunction

startfunction DETECT_BANK_VERSION
    savepos CURRENT

    goto OFFSET
    get DUMMY long #BKHD
    get DUMMY long #chunk size
    get BANK_VERSION long
    if BANK_VERSION > 0x1000
        print "wrong bank version, assuming new (set manually)"
        math BANK_VERSION = 62
    endif

    goto CURRENT
endfunction

startfunction PARSE_TABLE
    if SECTION_SIZE != 0
        get FILES long
        if FILES != 0
            if FILTER_BNK == 1 && EXT == "wem"
                print "skip wems"
            else
                callfunction PARSE_TABLE_INTERNAL 1
            endif
        endif
    endif
endfunction

startfunction PARSE_TABLE_INTERNAL
    xmath ENTRY_SIZE "(SECTION_SIZE - 0x04) / FILES"
    if ENTRY_SIZE == 0x18
        math ALT_MODE = 1
    else
        math ALT_MODE = 0
    endif

    for I = 0 < FILES
        if ALT_MODE == 1 && IS_EXTERNALS == 1
            #TODO: externals use 64b ID, but quickbms 32b doesn't support 64b vars
            #get ID longlong

            if CURRENT_ENDIAN == 0 #LE
                get ID2 long
                get ID1 long
            else
                get ID1 long
                get ID2 long
            endif
        else
            get ID long
        endif

        get BLOCK_SIZE long

        if ALT_MODE == 1 && IS_EXTERNALS == 1
            get SIZE long
        elif ALT_MODE == 1
            get SIZE longlong
        else
            get SIZE long
        endif

        get OFFSET long # START_BLOCK
        get LANG_ID long


        if BLOCK_SIZE != 0
            math OFFSET * BLOCK_SIZE
        endif

        # get version from first bnk for proper sound extensions
        if IS_SOUNDS == 0 AND BANK_VERSION == 0
            callfunction DETECT_BANK_VERSION 1
        endif

        # get codec ID to guess extension
        if IS_SOUNDS == 1 AND BANK_VERSION < 62
            savepos CURRENT

            math CODEC_OFFSET = OFFSET
            math CODEC_OFFSET += 0x14 #maybe should find "fmt " chunk first
            goto CODEC_OFFSET
            get CODEC short

            if CODEC == 0x0401 || CODEC == 0x0166 #0x0401: old XMA (not a codec)
                set EXT string "xma"
            elif CODEC == 0xFFFF
                set EXT string "ogg"
            else
                set EXT string "wav" #PCM, PCMEX, ADPCM, WIIADPCM
            endif

            goto CURRENT
        endif

        # ID 0 is "sfx" so just print in root
        if LANG_ID == 0
            string PATH = ""
        else
            getarray LANG_NAME 0 LANG_ID 
            string PATH p= "%s/" LANG_NAME
        endif

        if ALT_MODE == 1 && IS_EXTERNALS == 1
            #TODO: should print as non-hex but quickbms 32b doesn't support 64b vars
            string NAME p "externals/%s%08x%08x.%s" PATH ID1 ID2 EXT
        else
            string NAME p "%s%u.%s" PATH ID EXT
        endif

        #print "%NAME%: %OFFSET|h% %SIZE|h%"
        log NAME OFFSET SIZE
    next I
endfunction