format

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v1.9.0 Latest Latest
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 Go to latest Published: Oct 9, 2023 License: BSD-3-Clause Imports: 9 Imported by: 0

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Index

Constants

View Source 
const (
	// DataTypeEndOfMedia marks the last entry.
	DataTypeEndOfMedia = DataType(0)
	// DataTypeLowResVideo for low resolution (low compression) video.
	DataTypeLowResVideo = DataType(0x21)
	// DataTypeHighResVideo for high resolution (high compression) video.
	DataTypeHighResVideo = DataType(0x79)
	// DataTypeAudio marks an audio entry.
	DataTypeAudio = DataType(2)
	// DataTypeSubtitle control for subtitle entries.
	DataTypeSubtitle = DataType(3)
	// DataTypePalette describes a color palette.
	DataTypePalette = DataType(4)
	// DataTypePaletteReset is a zero-byte entry immediately before a Palette entry.
	DataTypePaletteReset = DataType(0x4C)
	// DataTypePaletteLookupList for high compression video.
	DataTypePaletteLookupList = DataType(5)
	// DataTypeControlDictionary for high compression video.
	DataTypeControlDictionary = DataType(0x0D)
)
View Source 
const (
	EntryBucketPriorityAudio           = 0
	EntryBucketPriorityVideoControl    = 1
	EntryBucketPrioritySubtitleControl = 2
	EntryBucketPrioritySubtitle        = 3
	EntryBucketPriorityFrame           = 4
)

List of entry bucket priorities.

View Source 
const (
	SubtitleArea    = SubtitleControl(0x41455241)
	SubtitleTextStd = SubtitleControl(0x20445453)
	SubtitleTextFrn = SubtitleControl(0x204E5246)
	SubtitleTextGer = SubtitleControl(0x20524547)
)

Subtitle constants are based on four-letter ASCII sequences.

View Source 
const HeaderSize = 256

HeaderSize specifies the length of a serialized Header in bytes.

View Source 
const IndexTableEntrySize = 8

IndexTableEntrySize specifies how many bytes a serialized IndexTableEntry uses.

View Source 
const SubtitleDefaultTextOffset = 16

SubtitleDefaultTextOffset is the typical offset, in bytes, to text content.

View Source 
const Tag string = "MOVI"

Tag is the identifier key of a MOVI container.

Variables

This section is empty.

Functions

func IndexTableSizeFor added in v1.8.0 

func IndexTableSizeFor(entryCount int) int

IndexTableSizeFor returns the number of bytes reserved for given amount of table entries.

Types

type AudioEntryData 

type AudioEntryData struct {
	Samples []byte
}

AudioEntryData is an entry with audio samples.

func AudioEntryFrom 

func AudioEntryFrom(r io.Reader, dataSize int) (AudioEntryData, error)

AudioEntryFrom decodes an entry from given data.

func (AudioEntryData) Bytes 

func (data AudioEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (AudioEntryData) Type 

func (data AudioEntryData) Type() DataType

Type describes the entry.

type ControlDictionaryEntryData 

type ControlDictionaryEntryData struct {
	Words []compression.ControlWord
}

ControlDictionaryEntryData contains control words for compression.

func ControlDictionaryEntryFrom 

func ControlDictionaryEntryFrom(r io.Reader, dataSize int) (ControlDictionaryEntryData, error)

ControlDictionaryEntryFrom decodes an entry from given data.

func (ControlDictionaryEntryData) Bytes 

func (data ControlDictionaryEntryData) Bytes() []byte

Bytes serializes the entry.

func (ControlDictionaryEntryData) Type 

func (data ControlDictionaryEntryData) Type() DataType

Type describes the entry.

type DataType 

type DataType byte

DataType classifies entries.

type Entry 

type Entry struct {
	// Timestamp marks the beginning time of the entry.
	Timestamp Timestamp
	// Data is a type specific information of a movie.
	Data EntryData
}

Entry describes a timestamped block from a MOVI container.

type EntryBucket 

type EntryBucket struct {
	// Priority helps in merging content from multiple buckets.
	Priority EntryBucketPriority
	// Timestamp specifies at which time the bucket should be inserted into the stream.
	// This is typically derived from one of the timestamps of the contained entries.
	Timestamp Timestamp
	// Entries is the list of entries within this bucket.
	Entries []Entry
}

EntryBucket is a set of entries that need to be together within the stream. This exists mainly to cover special cases of entries within a stream that have no valid timestamp.

type EntryBucketPriority 

type EntryBucketPriority int

EntryBucketPriority describes the general priority of the bucket. Lower numbers are put before higher numbers if the bucket has the same timestamp.

type EntryData 

type EntryData interface {
	// Type describes the content type of the data.
	Type() DataType
	// Bytes returns the raw bytes of the entry.
	Bytes() []byte
}

EntryData describes one entry in a MOVI container.

type Fix 

type Fix struct {
	Fraction uint16
	Number   int16
}

Fix represents a fixed-point number, with 16 bits of fraction and 15 bits of integer number.

func FixFromFloat 

func FixFromFloat(value float32) Fix

FixFromFloat returns a fixed-point number from given floating-point number.

func (Fix) ToFloat 

func (f Fix) ToFloat() float32

ToFloat returns the equivalent floating-point number. 

type Header struct {
	// Tag is the identifier key of a MOVI container
	Tag [4]byte
	// IndexEntryCount specifies how many index entries are in the index.
	IndexEntryCount int32
	// IndexSize specifies how long the index is.
	IndexSize int32
	// ContentSize specifies the length of the content.
	ContentSize int32
	// Duration is the length of the media in seconds.
	Duration Fix

	// VideoFrameRate gives a hint on number of frames per second.
	VideoFrameRate Fix
	// VideoWidth specifies the width of the video.
	VideoWidth uint16
	// VideoHeight specifies the height of the video.
	VideoHeight uint16
	// VideoBitsPerPixel specifies bit count for color information: 8, 15, 24.
	VideoBitsPerPixel int16
	// VideoPalettePresent specifies whether a palette is set.
	VideoPalettePresent int16

	// AudioChannelCount specifies whether there is audio, and how many channels to use. 0 = no audio, 1 = mono, 2 = stereo.
	AudioChannelCount int16
	// AudioBytesPerSample specifies how many bytes one audio sample has. 1 = 8-bit, 2 = 16-bit.
	AudioBytesPerSample int16
	// AudioSampleRate specifies the sample rate of the audio.
	AudioSampleRate Fix
	// contains filtered or unexported fields
}

Header is the first entry of a MOVI container.

func (*Header) String 

func (header *Header) String() (result string)

type HighResVideoEntryData 

type HighResVideoEntryData struct {
	Bitstream  []byte
	Maskstream []byte
}

HighResVideoEntryData is a compressed high-resolution video frame.

func HighResVideoEntryFrom 

func HighResVideoEntryFrom(r io.Reader, dataSize int) (HighResVideoEntryData, error)

HighResVideoEntryFrom decodes an entry from given data.

func (HighResVideoEntryData) Bytes 

func (data HighResVideoEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (HighResVideoEntryData) Type 

func (data HighResVideoEntryData) Type() DataType

Type describes the entry.

type IndexTableEntry 

type IndexTableEntry struct {
	TimestampFraction uint16
	TimestampSecond   byte
	Type              byte
	DataOffset        int32
}

IndexTableEntry describes one data entry of a MOVI container.

type LowResVideoEntryData 

type LowResVideoEntryData struct {
	BoundingBox [4]uint16
	Packed      []byte
}

LowResVideoEntryData is a compressed low-resolution video frame.

func LowResVideoEntryFrom 

func LowResVideoEntryFrom(r io.Reader, dataSize int) (LowResVideoEntryData, error)

LowResVideoEntryFrom decodes an entry from given data.

func (LowResVideoEntryData) Bytes 

func (data LowResVideoEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (LowResVideoEntryData) Type 

func (data LowResVideoEntryData) Type() DataType

Type describes the entry.

type PaletteEntryData 

type PaletteEntryData struct {
	Colors bitmap.Palette
}

PaletteEntryData is an entry with a palette.

func PaletteEntryFrom 

func PaletteEntryFrom(r io.Reader) (PaletteEntryData, error)

PaletteEntryFrom decodes an entry from given data.

func (PaletteEntryData) Bytes 

func (data PaletteEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (PaletteEntryData) Type 

func (data PaletteEntryData) Type() DataType

Type describes the entry.

type PaletteLookupEntryData 

type PaletteLookupEntryData struct {
	List []byte
}

PaletteLookupEntryData contains a list of palette indices.

func PaletteLookupEntryFrom 

func PaletteLookupEntryFrom(r io.Reader, dataSize int) (PaletteLookupEntryData, error)

PaletteLookupEntryFrom decodes an entry from given data.

func (PaletteLookupEntryData) Bytes 

func (data PaletteLookupEntryData) Bytes() []byte

Bytes serializes the entry.

func (PaletteLookupEntryData) Type 

func (data PaletteLookupEntryData) Type() DataType

Type describes the entry.

type PaletteResetEntryData 

type PaletteResetEntryData struct {
}

PaletteResetEntryData marks a reset of the palette.

func PaletteResetEntryFrom 

func PaletteResetEntryFrom() (PaletteResetEntryData, error)

PaletteResetEntryFrom decodes an entry from given data.

func (PaletteResetEntryData) Bytes 

func (data PaletteResetEntryData) Bytes() []byte

Bytes serializes the entry.

func (PaletteResetEntryData) Type 

func (data PaletteResetEntryData) Type() DataType

Type describes the entry.

type SubtitleControl 

type SubtitleControl uint32

SubtitleControl specifies how to interpret a subtitle entry.

func SubtitleControlForLanguage 

func SubtitleControlForLanguage(lang resource.Language) SubtitleControl

SubtitleControlForLanguage returns the corresponding subtitle control for given language.

func (SubtitleControl) String 

func (ctrl SubtitleControl) String() string

String returns the string presentation of the control value.

type SubtitleEntryData 

type SubtitleEntryData struct {
	Control SubtitleControl
	Text    []byte
}

SubtitleEntryData is an entry with Subtitle samples.

func SubtitleEntryFrom 

func SubtitleEntryFrom(r io.Reader, dataSize int) (SubtitleEntryData, error)

SubtitleEntryFrom decodes an entry from given data.

func (SubtitleEntryData) Bytes 

func (data SubtitleEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (SubtitleEntryData) Type 

func (data SubtitleEntryData) Type() DataType

Type describes the entry.

type SubtitleHeader 

type SubtitleHeader struct {
	// Control specifies how to interpret the string content
	Control SubtitleControl
	// TextOffset specifies the offset, in bytes from beginning of entry data, where the text starts.
	TextOffset uint32
}

SubtitleHeader is the header structure of a subtitle data.

type Timestamp 

type Timestamp struct {
	Second   uint8
	Fraction uint16
}

Timestamp represents a point in time using fixed resolution.

func TimestampFromDuration 

func TimestampFromDuration(d time.Duration) Timestamp

TimestampFromDuration creates a timestamp instance from given duration value.

func TimestampFromSeconds 

func TimestampFromSeconds(value float32) Timestamp

TimestampFromSeconds creates a timestamp instance from given floating point value.

func TimestampLimit 

func TimestampLimit() Timestamp

TimestampLimit returns the highest possible timestamp value.

func (Timestamp) IsAfter 

func (ts Timestamp) IsAfter(other Timestamp) bool

IsAfter returns true if this timestamp is later than the given one.

func (Timestamp) IsBefore 

func (ts Timestamp) IsBefore(other Timestamp) bool

IsBefore returns true if this timestamp is before the given one.

func (Timestamp) Minus 

func (ts Timestamp) Minus(other Timestamp) Timestamp

Minus returns a timestamp with given one removed from the current one. The result is clipped to 0 if subtraction would result in a negative number.

func (Timestamp) Plus 

func (ts Timestamp) Plus(other Timestamp) Timestamp

Plus returns a timestamp with the given one added to the current one. The result is saturated if the addition is larger than the timestamp can hold.

func (Timestamp) ToDuration 

func (ts Timestamp) ToDuration() time.Duration

ToDuration returns the equivalent duration for this timestamp.

type UnknownEntryData 

type UnknownEntryData struct {
	DataType DataType
	Raw      []byte
}

UnknownEntryData is an entry that is not know to this codebase.

func UnknownEntryFrom 

func UnknownEntryFrom(dataType DataType, r io.Reader, dataSize int) (UnknownEntryData, error)

UnknownEntryFrom decodes an entry from given data.

func (UnknownEntryData) Bytes 

func (data UnknownEntryData) Bytes() []byte

Bytes returns the raw bytes of the entry.

func (UnknownEntryData) Type 

func (data UnknownEntryData) Type() DataType

Type describes the entry.

Source Files

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