mp4/mp4muxer_alac.py

from datetime import datetime
from tags import Tags


def dt_to_unix_ts(ts: datetime) -> int:
    return int(ts.timestamp())


def dt_to_mp4_ts(ts: datetime) -> int:
    return int(ts.timestamp()) + 2082844800


def s2b(s: str):
    return bytearray(s.encode("ascii"))


def i2b(i: int, size: int = 4):
    return bytearray(i.to_bytes(size, "big"))


class MP4MuxerALAC:
    def __init__(self) -> None:
        self.data: bytearray = bytearray()
        self.timestamp: datetime = datetime.now()
        self.sample_rate: int = 0
        self.number_of_samples: int = 0
        self.bit_depth: int = 0
        self.samples_per_frame: int = 4096
        self.channel_count: int = 2
        self.sample_sizes: list[int] = []
        # these are the only important ones
        self.offsets: dict = {
            "stco": 0,
            "mdat": 0,
        }

        self.total_duration: int = 0
        self.mdat_data: bytearray = bytearray()
        self.tags: Tags = None

    def create(self) -> None:
        self.ftyp()
        self.moov()
        self.free()
        self.mdat()
        self.rewrite_stco_chunk()

    def out(self, filename: str) -> None:
        with open(filename, "wb") as f:
            f.write(self.data)

    def w(self, b: bytearray):
        if isinstance(b, bytes):
            b = bytearray(b)
        self.data.extend(b)

    def set_sample_rate(self, sr: int) -> None:
        self.sample_rate = sr

    def set_number_of_samples(self, nr: int) -> None:
        self.number_of_samples = nr

    def set_bit_depth(self, bd: int) -> None:
        self.bit_depth = bd

    def set_sample_sizes(self, ss: int) -> None:
        self.sample_sizes = ss

    def set_total_duration(self, td: int) -> None:
        self.total_duration = td

    def set_mdat_data(self, m: bytearray) -> None:
        self.mdat_data = m

    def set_tags(self, t: Tags) -> None:
        self.tags = t

    def set_timestamp(self, t: datetime) -> None:
        self.timestamp = t

    def ftyp(self) -> None:
        major_brand: str = "M4A "
        minor_version: int = 0
        compatible_brands: list[str] = ["M4A ", "mp42", "isom"]
        size: int = 16 + (len(compatible_brands) * 4)

        self.w(i2b(size))
        self.w(s2b("ftyp"))
        self.w(s2b(major_brand))
        self.w(i2b(minor_version))
        for c in compatible_brands:
            self.w(s2b(c))

    def moov_size(self) -> int:
        total_size: int = 8
        total_size += self.mvhd_size()
        total_size += self.trak_size()
        if self.tags:
            total_size += self.udta_size()
        return total_size

    def moov(self) -> None:
        self.w(i2b(self.moov_size()))
        self.w(s2b("moov"))
        self.mvhd()
        self.trak()
        if self.tags:
            self.udta()

    def mvhd_size(self) -> int:
        return 108

    def mvhd(self) -> None:
        version: int = 0
        creation_time: datetime = self.timestamp
        modification_time: datetime = self.timestamp
        time_scale: int = self.sample_rate
        duration: int = self.total_duration
        rate: int = 0x10000  # 1.0
        volume: int = 0x100  # 1.0
        next_track_id: int = 2

        self.w(i2b(self.mvhd_size()))
        self.w(s2b("mvhd"))
        self.w(i2b(version))
        self.w(i2b(dt_to_mp4_ts(creation_time)))
        self.w(i2b(dt_to_mp4_ts(modification_time)))
        self.w(i2b(time_scale))
        self.w(i2b(duration))
        self.w(i2b(rate))
        self.w(i2b(volume, 2))

        # const bit(16) reserved = 0
        self.w(i2b(0, 2))
        # const unsigned int(32)[2] reserved = 0
        self.w(i2b(0, 8))
        # template int(32)[9] matrix
        # { 0x00010000,0,0,0,0x00010000,0,0,0,0x40000000 }
        self.w(i2b(0x10000))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0x10000))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0x40000000))
        # Unity matrix
        # bit(32)[6] pre_defined = 0
        self.w(i2b(0, 24))
        self.w(i2b(next_track_id))

    def trak_size(self) -> int:
        total_size: int = 8
        total_size += self.tkhd_size()
        total_size += self.mdia_size()
        return total_size

    def trak(self) -> None:
        self.w(i2b(self.trak_size()))
        self.w(s2b("trak"))
        self.tkhd()
        self.mdia()

    def tkhd_size(self) -> int:
        return 92

    def tkhd(self) -> None:
        flags: int = 1
        creation_time: datetime = self.timestamp
        modification_time: datetime = self.timestamp
        track_id: int = 1
        duration: int = self.total_duration
        layer: int = 0
        alternate_group: int = 0
        volume: int = 0x100  # 1.0
        width: int = 0
        height: int = 0

        self.w(i2b(self.tkhd_size()))
        self.w(s2b("tkhd"))

        self.w(i2b(flags))
        self.w(i2b(dt_to_mp4_ts(creation_time)))
        self.w(i2b(dt_to_mp4_ts(modification_time)))
        self.w(i2b(track_id))

        # const unsigned int (32) reserved = 0
        self.w(i2b(0))
        self.w(i2b(duration))
        # reserved
        self.w(i2b(0))
        # const unsigned int (32) [2] reserved = 0
        self.w(i2b(0))
        self.w(i2b(layer, 2))
        self.w(i2b(alternate_group, 2))
        # template int (16) volume = {if track_is_audio 0x0100 else 0}
        self.w(i2b(volume, 2))
        # const unsigned int (16) reserved = 0
        self.w(i2b(0, 2))
        # template int (32) [9] matrix
        # { 0x00010000,0,0,0,0x00010000,0,0,0,0x40000000 }
        self.w(i2b(0x10000))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0x10000))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0))
        self.w(i2b(0x40000000))
        # Unity matrix
        # unsigned int (32) width
        self.w(i2b(width))
        # unsigned int (32) height
        self.w(i2b(height))

    def mdia_size(self) -> int:
        total_size: int = 8
        total_size += self.mdhd_size()
        total_size += self.hdlr_size()
        total_size += self.minf_size()
        return total_size

    def mdia(self) -> None:
        self.w(i2b(self.mdia_size()))
        self.w(s2b("mdia"))
        self.mdhd()
        self.hdlr()
        self.minf()

    def mdhd_size(self) -> int:
        return 32

    def mdhd(self) -> None:
        version: int = 0
        flags: int = 0
        creation_time: datetime = self.timestamp
        modification_time: datetime = self.timestamp
        time_scale: int = self.sample_rate
        duration: int = self.total_duration
        language: int = 0x55C4  # undefined
        quality: int = 0

        self.w(i2b(self.mdhd_size()))
        self.w(s2b("mdhd"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(dt_to_mp4_ts(creation_time)))
        self.w(i2b(dt_to_mp4_ts(modification_time)))
        self.w(i2b(time_scale))
        self.w(i2b(duration))
        self.w(i2b(language, 2))
        self.w(i2b(quality, 2))

    def hdlr_size(self) -> int:
        return 32

    def hdlr(self) -> None:
        version: int = 0
        flags: int = 0
        component_type = "mhlr"  # media handler
        component_subtype = "soun"
        component_name = 0
        component_flags = 0
        component_flags_mask = 0

        self.w(i2b(self.hdlr_size()))
        self.w(s2b("hdlr"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(s2b(component_type))
        self.w(s2b(component_subtype))
        self.w(i2b(component_name))
        self.w(i2b(component_flags))
        self.w(i2b(component_flags_mask))

    def minf_size(self) -> int:
        total_size: int = 8
        total_size += self.smhd_size()
        total_size += self.dinf_size()
        total_size += self.stbl_size()
        return total_size

    def minf(self) -> None:
        self.w(i2b(self.minf_size()))
        self.w(s2b("minf"))
        self.smhd()
        self.dinf()
        self.stbl()

    def smhd_size(self) -> int:
        return 16

    def smhd(self) -> None:
        version: int = 0
        flags: int = 0
        audio_balance: int = 0

        self.w(i2b(self.smhd_size()))
        self.w(s2b("smhd"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(audio_balance, 2))
        self.w(i2b(0, 2))  # reserved

    def dinf_size(self) -> int:
        total_size: int = 8
        total_size += self.dref_size()
        return total_size

    def dinf(self) -> None:
        self.w(i2b(self.dinf_size()))
        self.w(s2b("dinf"))
        self.dref()
        pass

    def dref_size(self) -> int:
        return 28

    def dref(self) -> None:
        version: int = 0
        flags: int = 0
        entry_count: int = 1
        self.w(i2b(self.dref_size()))
        self.w(s2b("dref"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(entry_count))

        data_location_size: int = 12
        data_location_name: str = "url "
        data_location_version: int = 0
        data_location_flags: int = 1  # same file

        self.w(i2b(data_location_size))
        self.w(s2b(data_location_name))
        self.w(i2b(data_location_version, 1))
        self.w(i2b(data_location_flags, 3))

    def stbl_size(self) -> int:
        total_size: int = 8
        total_size += self.stsd_size()
        total_size += self.stts_size()
        total_size += self.stsz_size()
        total_size += self.stsc_size()
        total_size += self.stco_size()
        return total_size

    def stbl(self) -> None:
        self.w(i2b(self.stbl_size()))
        self.w(s2b("stbl"))
        self.stsd()
        self.stts()
        self.stsz()
        self.stsc()
        self.stco()

    def stsd_size(self) -> int:
        return 88

    def stsd(self) -> None:
        version: int = 0
        flags: int = 0
        count: int = 1
        audio_size: int = 72
        audio_name: str = "alac"
        channel_count: int = self.channel_count
        sample_size: int = self.bit_depth
        sample_rate: int = self.sample_rate
        samples_per_frame: int = self.samples_per_frame
        max_coded_frame_size: int = max(self.sample_sizes)

        self.w(i2b(self.stsd_size()))
        self.w(s2b("stsd"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(count))
        self.w(i2b(audio_size))
        self.w(s2b(audio_name))
        self.w(i2b(0, 6))  # reserved
        self.w(i2b(1, 2))  # data reference index
        self.w(i2b(0))  # reserved
        self.w(i2b(0))  # reserved
        self.w(i2b(channel_count, 2))
        self.w(i2b(sample_size, 2))
        self.w(i2b(0, 2))  # pre-defined
        self.w(i2b(0, 2))  # reserved
        if sample_rate <= 65535:
            self.w(i2b(sample_rate, 2))
        else:
            self.w(i2b(0, 2))
        self.w(i2b(0, 2))  # sample rate (again? set to zero for some reason)
        # magic cookie starts here
        self.w(i2b(36))  # size
        self.w(s2b("alac"))
        self.w(i2b(0))  # reserved
        self.w(i2b(samples_per_frame))
        self.w(i2b(0, 1))  # reserved
        self.w(i2b(sample_size, 1))
        self.w(i2b(40, 1))  # rice history mult, pb, tuning parameter
        self.w(i2b(10, 1))  # rice initial history, mb, tuning parameter
        self.w(i2b(14, 1))  # rice kmodifier, kb, tuning parameter
        self.w(i2b(channel_count, 1))
        self.w(i2b(255, 2))  # maxRun, currently unused
        self.w(i2b(max_coded_frame_size))

        self.w(i2b(self.sample_rate * self.bit_depth * self.channel_count))  # bitrate
        self.w(i2b(sample_rate))

    def stts_size(self) -> int:
        total_size: int = 16
        # size of the stts box depends on the number of entries
        number_of_entries: int = 2
        if self.total_duration % self.samples_per_frame == 0:
            number_of_entries = 1
        total_size += 8 * number_of_entries
        return total_size

    def stts(self) -> None:
        version: int = 0
        flags: int = 0
        number_of_entries: int = 2
        if self.total_duration % self.samples_per_frame == 0:
            number_of_entries = 1
        self.w(i2b(self.stts_size()))
        self.w(s2b("stts"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(number_of_entries))

        if number_of_entries == 1:
            self.w(i2b(len(self.sample_sizes)))
            self.w(i2b(self.samples_per_frame))
        elif number_of_entries == 2:
            self.w(i2b(len(self.sample_sizes) - 1))
            self.w(i2b(self.samples_per_frame))
            self.w(i2b(1))
            self.w(i2b(self.total_duration % self.samples_per_frame))

    def stsz_size(self) -> int:
        total_size: int = 20
        total_size += 4 * len(self.sample_sizes)
        return total_size

    def stsz(self) -> None:
        version: int = 0
        flags: int = 0
        sample_size: int = 0
        sample_count: int = len(self.sample_sizes)

        self.w(i2b(self.stsz_size()))
        self.w(s2b("stsz"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(sample_size))
        self.w(i2b(sample_count))

        for s in self.sample_sizes:
            self.w(i2b(s))

    def stsc_size(self) -> int:
        number_of_entries: int = 1
        entries_per_second: int = int(round(self.sample_rate / 4096))
        last_entry: int = len(self.sample_sizes) % entries_per_second
        if last_entry != 0:
            number_of_entries = 2

        total_size: int = 16 + (number_of_entries * 12)
        return total_size

    # we only write a single chunk
    # not sure what the side effects of this move are
    def stsc(self) -> None:
        version: int = 0
        flags: int = 0
        number_of_entries: int = 1
        entries_per_second: int = int(round(self.sample_rate / 4096))
        last_entry: int = len(self.sample_sizes) % entries_per_second
        first_chunk_count = int(
            (len(self.sample_sizes) - last_entry) / entries_per_second
        )
        entries = []
        entries.append(
            {
                "first_chunk": 1,
                "samples_per_chunk": entries_per_second,
                "sample_description_index": 1,
            }
        )
        if last_entry != 0:
            number_of_entries = 2
            entries.append(
                {
                    "first_chunk": first_chunk_count + 1,
                    "samples_per_chunk": last_entry,
                    "sample_description_index": 1,
                }
            )

        self.w(i2b(self.stsc_size()))
        self.w(s2b("stsc"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(number_of_entries))

        for s in entries:
            first_chunk: int = s["first_chunk"]
            samples_per_chunk: int = s["samples_per_chunk"]
            sample_description_index: int = s["sample_description_index"]
            self.w(i2b(first_chunk))
            self.w(i2b(samples_per_chunk))
            self.w(i2b(sample_description_index))

    def stco_size(self) -> int:
        total_size: int = 16
        entries_per_second: int = int(round(self.sample_rate / 4096))
        last_entry: int = len(self.sample_sizes) % entries_per_second
        first_chunk_count = int(
            (len(self.sample_sizes) - last_entry) / entries_per_second
        )
        number_of_stco_entries = first_chunk_count
        if last_entry != 0:
            number_of_stco_entries += 1
        total_size += 4 * number_of_stco_entries
        return total_size

    def stco(self) -> None:
        version: int = 0
        flags: int = 0
        self.offsets["stco"] = len(self.data)
        entries_per_second: int = int(round(self.sample_rate / 4096))
        last_entry: int = len(self.sample_sizes) % entries_per_second
        first_chunk_count = int(
            (len(self.sample_sizes) - last_entry) / entries_per_second
        )
        number_of_stco_entries = first_chunk_count
        if last_entry != 0:
            number_of_stco_entries += 1

        self.w(i2b(self.stco_size()))
        self.w(s2b("stco"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))

        self.w(i2b(number_of_stco_entries))

        for s in range(number_of_stco_entries):
            self.w(i2b(0xFFFFFFFF))  # placeholder value

    def free(self) -> None:
        self.w(i2b(8))
        self.w(s2b("free"))

    def mdat(self) -> None:
        self.offsets["mdat"] = len(self.data)
        self.w(i2b(8 + len(self.mdat_data)))
        self.w(s2b("mdat"))
        self.w(self.mdat_data)

    def rewrite_stco_chunk(self) -> None:
        stco_pos: int = self.offsets["stco"] + 16
        first_chunk_offset: int = self.offsets["mdat"] + 8
        entries_per_second: int = int(round(self.sample_rate / 4096))
        last_entry: int = len(self.sample_sizes) % entries_per_second
        first_chunk_count = int(
            (len(self.sample_sizes) - last_entry) / entries_per_second
        )
        number_of_stco_entries = first_chunk_count
        if last_entry != 0:
            number_of_stco_entries += 1

        for s in range(number_of_stco_entries):
            bytes_to_write = i2b(
                first_chunk_offset + (sum(self.sample_sizes[: entries_per_second * s]))
            )
            for index, b in enumerate(bytes_to_write):
                self.data[stco_pos + (s * 4) + index] = b

    def udta_size(self) -> int:
        return 8 + self.meta_size()

    def udta(self) -> None:
        self.w(i2b(self.udta_size()))
        self.w(s2b("udta"))
        self.meta()

    def meta_size(self) -> int:
        total_size: int = 12
        total_size += self.meta_hdlr_size()
        total_size += self.ilst_size()
        return total_size

    def meta(self) -> None:
        version: int = 0
        flags: int = 0

        self.w(i2b(self.meta_size()))
        self.w(s2b("meta"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))

        self.meta_hdlr()
        self.ilst()

    def meta_hdlr_size(self) -> int:
        return 33

    def meta_hdlr(self) -> None:
        version: int = 0
        flags: int = 0
        type_quicktime: int = 0
        metadata_type: str = "mdir"
        manufacturer: str = "appl"
        component_reserved_flags: int = 0
        component_reserved_flags_mask: int = 0
        component_type_name: int = 0

        self.w(i2b(self.meta_hdlr_size()))
        self.w(s2b("hdlr"))
        self.w(i2b(version, 1))
        self.w(i2b(flags, 3))
        self.w(i2b(type_quicktime))
        self.w(s2b(metadata_type))
        self.w(s2b(manufacturer))
        self.w(i2b(component_reserved_flags))
        self.w(i2b(component_reserved_flags_mask))
        self.w(i2b(component_type_name, 1))

    def ilst_size(self) -> int:
        total_size: int = 8
        if self.tags.track_name:
            total_size += 24 + len(self.tags.track_name.encode("utf-8"))
        if self.tags.artist:
            total_size += 24 + len(self.tags.artist.encode("utf-8"))
        if self.tags.album_artist:
            total_size += 24 + len(self.tags.album_artist.encode("utf-8"))
        if self.tags.composer:
            total_size += 24 + len(self.tags.composer.encode("utf-8"))
        if self.tags.album_name:
            total_size += 24 + len(self.tags.album_name.encode("utf-8"))
        if self.tags.genre:
            total_size += 24 + len(self.tags.genre.encode("utf-8"))
        if self.tags.date:
            total_size += 24 + len(self.tags.date.encode("utf-8"))
        if self.tags.isrc:
            total_size += 24 + len(self.tags.isrc.encode("utf-8"))
        if self.tags.copyright:
            total_size += 24 + len(self.tags.copyright.encode("utf-8"))
        if self.tags.track_number or self.tags.total_number_of_tracks:
            total_size += 32
        if self.tags.disc_number or self.tags.total_number_of_discs:
            total_size += 32
        if self.tags.upc:
            total_size += len(self.tags.upc.encode("utf-8")) + 64 + len("UPC")
        if self.tags.label:
            total_size += len(self.tags.label.encode("utf-8")) + 64 + len("LABEL")
        if self.tags.apple_store_catalog_id:
            total_size += 28
        if self.tags.playlist_id:
            total_size += 28
        if self.tags.album_title_id:
            total_size += 28
        if self.tags.cover_data:
            total_size += 24 + len(self.tags.cover_data)
        return total_size

    def write_mp4_tag_utf8(self, box: bytes, content: str):
        b: bytearray = bytearray(content.encode("utf-8"))
        data_size: int = len(b) + 16
        self.w(i2b(data_size + 8))
        self.w(box)
        self.w(i2b(data_size))
        self.w(s2b("data"))
        # 0 = binary; 1 = utf-8
        kind: int = 1
        language: int = 0
        self.w(i2b(kind))
        self.w(i2b(language))
        self.w(b)

    def write_mp4_tag_int(self, box: bytes, content: int):
        kind: int = 21  # signed integer
        language: int = 0
        size: int = 24 + len(box)
        self.w(i2b(size))
        self.w(box)
        size -= 8
        self.w(i2b(size))
        self.w(s2b("data"))
        self.w(i2b(kind))
        self.w(i2b(language))
        self.w(i2b(content))

    def write_itunes_tag_utf8(self, box: str, content: str):
        b: bytearray = bytearray(content.encode("utf-8"))
        full_size: int = len(b) + 64 + len(box)
        self.w(i2b(full_size))
        self.w(s2b("----"))
        mean_size: int = 28
        self.w(i2b(mean_size))
        self.w(s2b("mean"))
        self.w(i2b(0))  # unknown
        self.w(s2b("com.apple.iTunes"))
        name_size: int = 12 + len(box)
        self.w(i2b(name_size))
        self.w(s2b("name"))
        self.w(i2b(0))  # unknown
        self.w(s2b(box))
        data_size = len(b) + 16
        self.w(i2b(data_size))
        self.w(s2b("data"))
        # 0 = binary; 1 = utf-8
        kind: int = 1
        language: int = 0
        self.w(i2b(kind))
        self.w(i2b(language))
        self.w(b)

    def write_mp4_tag_tuple_int(self, box: bytes, curr: int, total: int):
        self.w(i2b(32))  # size
        self.w(box)
        self.w(i2b(24))  # data size
        self.w(s2b("data"))
        kind: int = 0  # binary
        language: int = 0
        self.w(i2b(kind))
        self.w(i2b(language))
        self.w(i2b(0, 2))  # reserved
        self.w(i2b(curr, 2))
        self.w(i2b(total, 2))
        self.w(i2b(0, 2))  # reserved

    def ilst(self) -> None:
        self.w(i2b(self.ilst_size()))
        self.w(s2b("ilst"))

        if self.tags.track_name:
            self.write_mp4_tag_utf8(b"\xA9\x6E\x61\x6D", self.tags.track_name)  # ©nam
        if self.tags.artist:
            self.write_mp4_tag_utf8(b"\xA9\x41\x52\x54", self.tags.artist)  # ©ART
        if self.tags.album_artist:
            self.write_mp4_tag_utf8(b"\x61\x41\x52\x54", self.tags.album_artist)  # aART
        if self.tags.composer:
            self.write_mp4_tag_utf8(b"\xA9\x77\x72\x74", self.tags.composer)  # ©wrt
        if self.tags.album_name:
            self.write_mp4_tag_utf8(b"\xA9\x61\x6C\x62", self.tags.album_name)  # ©alb
        if self.tags.genre:
            self.write_mp4_tag_utf8(b"\xA9\x67\x65\x6E", self.tags.genre)  # ©gen
        if self.tags.date:
            self.write_mp4_tag_utf8(b"\xA9\x64\x61\x79", self.tags.date)  # ©day
        if self.tags.isrc:
            self.write_mp4_tag_utf8(b"\x49\x53\x52\x43", self.tags.isrc)  # ISRC
        if self.tags.copyright:
            self.write_mp4_tag_utf8(b"\x63\x70\x72\x74", self.tags.copyright)  # cprt

        if self.tags.apple_store_catalog_id:
            self.write_mp4_tag_int(
                b"\x63\x6E\x49\x44", self.tags.apple_store_catalog_id
            )  # cnID
        if self.tags.playlist_id:
            self.write_mp4_tag_int(b"\x70\x6C\x49\x44", self.tags.playlist_id)  # plID
        if self.tags.album_title_id:
            self.write_mp4_tag_int(
                b"\x61\x74\x49\x44", self.tags.album_title_id
            )  # atID

        if self.tags.upc:
            self.write_itunes_tag_utf8("UPC", self.tags.upc)
        if self.tags.label:
            self.write_itunes_tag_utf8("LABEL", self.tags.label)

        if self.tags.track_number or self.tags.total_number_of_tracks:
            curr: int = 0
            if self.tags.track_number:
                curr = self.tags.track_number
            total: int = 0
            if self.tags.total_number_of_tracks:
                total = self.tags.total_number_of_tracks

            self.write_mp4_tag_tuple_int(b"\x74\x72\x6B\x6E", curr, total)

        if self.tags.disc_number or self.tags.total_number_of_discs:
            curr: int = 0
            if self.tags.disc_number:
                curr = self.tags.disc_number
            total: int = 0
            if self.tags.total_number_of_discs:
                total = self.tags.total_number_of_discs

            self.write_mp4_tag_tuple_int(b"\x64\x69\x73\x6B", curr, total)

        if self.tags.cover_data:
            if self.tags.cover_format == "jpeg":
                kind: int = 13
            elif self.tags.cover_format == "png":
                kind: int = 14
            language: int = 0
            b: bytearray = self.tags.cover_data

            full_size: int = len(b) + 24
            self.w(i2b(full_size))
            self.w(s2b("covr"))
            data_size: int = full_size - 8
            self.w(i2b(data_size))
            self.w(s2b("data"))
            self.w(i2b(kind))
            self.w(i2b(language))
            self.w(b)