Enum MetadataBlock 

pub enum MetadataBlock<'a> {
    VorbisComment(&'a str),
    Padding(u32),
    Application {
        id: [u8; 4],
        data: &'a [u8],
    },
    Seektable(&'a [SeekPoint]),
    CueSheet {
        media_catalog_number: &'a [u8; 128],
        lead_in: u64,
        is_cd: bool,
        tracks: &'a [CueSheetTrack<'a>],
    },
    Picture {
        picture_type: u32,
        mime_type: &'a str,
        description: &'a str,
        width: u32,
        height: u32,
        depth: u32,
        colors: u32,
        data: &'a [u8],
    },
}

A metadata block the caller can place after STREAMINFO (which the encoder always writes first). libFLAC writes blocks in the order given (the OGG reorder is compiled out for native FLAC), so this list maps 1:1 to the output.

Variants

VorbisComment(&'a str)

A VORBIS_COMMENT with the given vendor string and no user comments.

Padding(u32)

A PADDING block of N zero bytes.

Application

An APPLICATION block: a 4-byte registered application id + opaque data.

Fields

id: [u8; 4]

data: &'a [u8]

Seektable(&'a [SeekPoint])

A SEEKTABLE block: the seek points to serialize, in order. The encoder fills a template (each point’s sample_number a target, offsets 0) during encoding and writes the filled+sorted result; write_seektable serializes whatever points it is given verbatim.

CueSheet

A CUESHEET block: the 128-byte media catalog number, lead-in samples, the CD-DA flag, and the track list (each with its index points). Fully caller-supplied — unlike SEEKTABLE, nothing is generated during encoding.

Fields

media_catalog_number: &'a [u8; 128]

lead_in: u64

is_cd: bool

tracks: &'a [CueSheetTrack<'a>]

Picture

A PICTURE block (e.g. cover art). mime_type/description are stored with 32-bit length prefixes; picture_type is the FLAC picture-type code.

Fields

picture_type: u32

mime_type: &'a str

description: &'a str

width: u32

height: u32

depth: u32

colors: u32

data: &'a [u8]