meta

type Application struct {
	// Registered application ID.
	//
	// ref: https://www.xiph.org/flac/id.html
	ID uint32
	// Application data.
	Data []byte
}

type Block struct {
	// Metadata block header.
	Header
	// Metadata block body of type *StreamInfo, *Application, ... etc. Body is
	// initially nil, and gets populated by a call to Block.Parse.
	Body interface{}
	// contains filtered or unexported fields
}

type CueSheet struct {
	// Media catalog number.
	MCN string
	// Number of lead-in samples. This field only has meaning for CD-DA cue
	// sheets; for other uses it should be 0. Refer to the spec for additional
	// information.
	NLeadInSamples uint64
	// Specifies if the cue sheet corresponds to a Compact Disc.
	IsCompactDisc bool
	// One or more tracks. The last track of a cue sheet is always the lead-out
	// track.
	Tracks []CueSheetTrack
}

type CueSheetTrack struct {
	// Track offset in samples, relative to the beginning of the FLAC audio
	// stream.
	Offset uint64
	// Track number; never 0, always unique.
	Num uint8
	// International Standard Recording Code; empty string if not present.
	//
	// ref: http://isrc.ifpi.org/
	ISRC string
	// Specifies if the track contains audio or data.
	IsAudio bool
	// Specifies if the track has been recorded with pre-emphasis
	HasPreEmphasis bool
	// Every track has one or more track index points, except for the lead-out
	// track which has zero. Each index point specifies a position within the
	// track.
	Indicies []CueSheetTrackIndex
}

type CueSheetTrackIndex struct {
	// Index point offset in samples, relative to the track offset.
	Offset uint64
	// Index point number; subsequently incrementing by 1 and always unique
	// within a track.
	Num uint8
}

type Header struct {
	// Metadata block body type.
	Type Type
	// Length of body data in bytes.
	Length int64
	// IsLast specifies if the block is the last metadata block.
	IsLast bool
}

type Picture struct {
	// Picture type according to the ID3v2 APIC frame:
	//
	//     0: Other
	//     1: 32x32 pixels 'file icon' (PNG only)
	//     2: Other file icon
	//     3: Cover (front)
	//     4: Cover (back)
	//     5: Leaflet page
	//     6: Media (e.g. label side of CD)
	//     7: Lead artist/lead performer/soloist
	//     8: Artist/performer
	//     9: Conductor
	//    10: Band/Orchestra
	//    11: Composer
	//    12: Lyricist/text writer
	//    13: Recording Location
	//    14: During recording
	//    15: During performance
	//    16: Movie/video screen capture
	//    17: A bright coloured fish
	//    18: Illustration
	//    19: Band/artist logotype
	//    20: Publisher/Studio logotype
	//
	// ref: http://id3.org/id3v2.4.0-frames
	Type uint32
	// MIME type string. The MIME type "-->" specifies that the picture data is
	// to be interpreted as an URL instead of image data.
	MIME string
	// Description of the picture.
	Desc string
	// Image dimensions.
	Width, Height uint32
	// Color depth in bits-per-pixel.
	Depth uint32
	// Number of colors in palette; 0 for non-indexed images.
	NPalColors uint32
	// Image data.
	Data []byte
}

type SeekPoint struct {
	// Sample number of the first sample in the target frame, or
	// 0xFFFFFFFFFFFFFFFF for a placeholder point.
	SampleNum uint64
	// Offset in bytes from the first byte of the first frame header to the first
	// byte of the target frame's header.
	Offset uint64
	// Number of samples in the target frame.
	NSamples uint16
}

type SeekTable struct {
	// One or more seek points.
	Points []SeekPoint
}

type StreamInfo struct {
	// Minimum block size (in samples) used in the stream; between 16 and 65535
	// samples.
	BlockSizeMin uint16
	// Maximum block size (in samples) used in the stream; between 16 and 65535
	// samples.
	BlockSizeMax uint16
	// Minimum frame size in bytes; a 0 value implies unknown.
	FrameSizeMin uint32
	// Maximum frame size in bytes; a 0 value implies unknown.
	FrameSizeMax uint32
	// Sample rate in Hz; between 1 and 655350 Hz.
	SampleRate uint32
	// Number of channels; between 1 and 8 channels.
	NChannels uint8
	// Sample size in bits-per-sample; between 4 and 32 bits.
	BitsPerSample uint8
	// Total number of inter-channel samples in the stream. One second of 44.1
	// KHz audio will have 44100 samples regardless of the number of channels. A
	// 0 value implies unknown.
	NSamples uint64
	// MD5 checksum of the unencoded audio data.
	MD5sum [md5.Size]uint8
}

type Type uint8

type VorbisComment struct {
	// Vendor name.
	Vendor string
	// A list of tags, each represented by a name-value pair.
	Tags [][2]string
}