m3u8

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 Go to latest Published: Sep 11, 2023 License: BSD-3-Clause Imports: 9 Imported by: 0

README

M3U8

This is the most complete opensource library for parsing and generating of M3U8 playlists used in HTTP Live Streaming (Apple HLS) for internet video translations.

M3U8 is simple text format and parsing library for it must be simple too. It does not offer ways to play HLS or handle playlists over HTTP. So library features are:

  • Support HLS specs up to version 5 of the protocol.
  • Parsing and generation of master-playlists and media-playlists.
  • Autodetect input streams as master or media playlists.
  • Offer structures for keeping playlists metadata.
  • Encryption keys support for use with DRM systems like Verimatrix etc.
  • Support for non standard Google Widevine tags.

The library covered by BSD 3-clause license. See LICENSE for the full text. Versions 0.8 and below was covered by GPL v3. License was changed from the version 0.9 and upper.

See the list of the library authors at AUTHORS file.

Project status

I moved away from videostreaming years ago and directly not used this code in my projects now. Hence the project mostly abandoned. Anyway I interested in keeping the code as useful as possible. I'll keep the eye on the issues when I have the time. Time is the biggest issue :|

  1. Any patches are welcome especially bugfixes.
  2. If you want to maintain the project open the issue or directly contact me.
  3. If you have alternatives (including the forks of this project) that you prefer to maintain by self, drop a link for including to this readme.

Install

go get github.com/grafov/m3u8

or get releases from https://github.com/grafov/m3u8/releases

Documentation GoDoc

Package online documentation (examples included) available at:

Supported by the HLS protocol tags and their library support explained in M3U8 cheatsheet.

Examples

Parse playlist:

	f, err := os.Open("playlist.m3u8")
	if err != nil {
		panic(err)
	}
	p, listType, err := m3u8.DecodeFrom(bufio.NewReader(f), true)
	if err != nil {
		panic(err)
	}
	switch listType {
	case m3u8.MEDIA:
		mediapl := p.(*m3u8.MediaPlaylist)
		fmt.Printf("%+v\n", mediapl)
	case m3u8.MASTER:
		masterpl := p.(*m3u8.MasterPlaylist)
		fmt.Printf("%+v\n", masterpl)
	}

Then you get filled with parsed data structures. For master playlists you get Master struct with slice consists of pointers to Variant structures (which represent playlists to each bitrate). For media playlist parser returns MediaPlaylist structure with slice of Segments. Each segment is of MediaSegment type. See structure.go or full documentation (link below).

You may use API methods to fill structures or create them manually to generate playlists. Example of media playlist generation:

	p, e := m3u8.NewMediaPlaylist(3, 10) // with window of size 3 and capacity 10
	if e != nil {
		panic(fmt.Sprintf("Creating of media playlist failed: %s", e))
	}
	for i := 0; i < 5; i++ {
		e = p.Append(fmt.Sprintf("test%d.ts", i), 6.0, "")
		if e != nil {
			panic(fmt.Sprintf("Add segment #%d to a media playlist failed: %s", i, e))
		}
	}
	fmt.Println(p.Encode().String())

Custom Tags

M3U8 supports parsing and writing of custom tags. You must implement both the CustomTag and CustomDecoder interface for each custom tag that may be encountered in the playlist. Look at the template files in example/template/ for examples on parsing custom playlist and segment tags.

Library structure

Library has compact code and bundled in three files:

  • structure.go — declares all structures related to playlists and their properties
  • reader.go — playlist parser methods
  • writer.go — playlist generator methods

Each file has own test suite placed in *_test.go accordingly.

Library usage

This library was successfully used in streaming software developed for company where I worked several years ago. It was tested then in generating of VOD and Live streams and parsing of Widevine Live streams. Also the library used in opensource software so you may look at these apps for usage examples:

Project status Go Report Card

Build Status Build Status Coverage Status

DeepSource

Code coverage: https://gocover.io/github.com/grafov/m3u8

Project maintainers

Thank to all people who contrubuted to the code and maintain it. Especially thank to the maintainers who involved in the project actively in the past and helped to keep code actual:

  • Lei Gao @leikao
  • Bradley Falzon @bradleyfalzon

New maitainers are welcome.

Alternatives

On the project start in 2013 there was no any other libs in Go for m3u8. Later the alternatives came. Some of them may be more fit current standards.

Drop a link in issue if you know other projects.

FYI M3U8 parsing/generation in other languages

Documentation

Index

Examples

Constants

View Source 
const (

	// DATETIME represents format of the timestamps in encoded
	// playlists. Format for EXT-X-PROGRAM-DATE-TIME defined in
	// section 3.4.5
	DATETIME = time.RFC3339Nano
)

Variables

View Source 
var ErrPlaylistFull = errors.New("playlist is full")

ErrPlaylistFull declares the playlist error.

View Source 
var TimeParse func(value string) (time.Time, error) = FullTimeParse

TimeParse allows globally apply and/or override Time Parser function. Available variants:

  • FullTimeParse - implements full featured ISO/IEC 8601:2004
  • StrictTimeParse - implements only RFC3339 Nanoseconds format

Functions

func Decode 

func Decode(data bytes.Buffer, strict bool) (Playlist, ListType, error)

Decode detects type of playlist and decodes it. It accepts bytes buffer as input.

func DecodeAttributeList 

func DecodeAttributeList(line string) map[string]string

DecodeAttributeList turns an attribute list into a key, value map. You should trim any characters not part of the attribute list, such as the tag and ':'.

func DecodeFrom 

func DecodeFrom(reader io.Reader, strict bool) (Playlist, ListType, error)

DecodeFrom detects type of playlist and decodes it. It accepts data conformed with io.Reader.

func DecodeWith 

func DecodeWith(input interface{}, strict bool, customDecoders []CustomDecoder) (Playlist, ListType, error)

DecodeWith detects the type of playlist and decodes it. It accepts either bytes.Buffer or io.Reader as input. Any custom decoders provided will be used during decoding.

func FullTimeParse 

func FullTimeParse(value string) (time.Time, error)

FullTimeParse implements ISO/IEC 8601:2004.

func StrictTimeParse 

func StrictTimeParse(value string) (time.Time, error)

StrictTimeParse implements RFC3339 with Nanoseconds accuracy.

Types

type Alternative 

type Alternative struct {
	GroupId         string
	URI             string
	Type            string
	Language        string
	Name            string
	Default         bool
	Autoselect      string
	Forced          string
	Characteristics string
	Subtitles       string
}

Alternative structure represents EXT-X-MEDIA tag in variants.

type CustomDecoder 

type CustomDecoder interface {
	// TagName should return the full indentifier including the leading '#' as well as the
	// trailing ':' if the tag also contains a value or attribute list
	TagName() string
	// Decode parses a line from the playlist and returns the CustomTag representation
	Decode(line string) (CustomTag, error)
	// SegmentTag should return true if this CustomDecoder should apply per segment.
	// Should returns false if it a MediaPlaylist header tag.
	// This value is ignored for MasterPlaylists.
	SegmentTag() bool
}

CustomDecoder interface for decoding custom and unsupported tags

type CustomTag 

type CustomTag interface {
	// TagName should return the full indentifier including the leading '#' as well as the
	// trailing ':' if the tag also contains a value or attribute list
	TagName() string
	// Encode should return the complete tag string as a *bytes.Buffer. This will
	// be used by Playlist.Decode to write the tag to the m3u8.
	// Return nil to not write anything to the m3u8.
	Encode() *bytes.Buffer
	// String should return the encoded tag as a string.
	String() string
}

CustomTag interface for encoding custom and unsupported tags

type Key 

type Key struct {
	Method            string
	URI               string
	IV                string
	Keyformat         string
	Keyformatversions string
}

Key structure represents information about stream encryption.

Realizes EXT-X-KEY tag.

type ListType 

type ListType uint

ListType is type of the playlist. 

const (
	// use 0 for not defined type
	MASTER ListType = iota + 1
	MEDIA
)

type Map 

type Map struct {
	URI    string
	Limit  int64 // <n> is length in bytes for the file under URI
	Offset int64 // [@o] is offset from the start of the file under URI
}

Map structure represents specifies how to obtain the Media Initialization Section required to parse the applicable Media Segments.

It applied to every Media Segment that appears after it in the Playlist until the next EXT-X-MAP tag or until the end of the playlist.

Realizes EXT-MAP tag.

type MasterPlaylist 

type MasterPlaylist struct {
	Variants      []*Variant
	Args          string // optional arguments placed after URI (URI?Args)
	CypherVersion string // non-standard tag for Widevine (see also WV struct)

	Custom map[string]CustomTag
	// contains filtered or unexported fields
}

MasterPlaylist structure represents a master playlist which combines media playlists for multiple bitrates. URI lines in the playlist identify media playlists. Sample of Master Playlist file: 

#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1280000
http://example.com/low.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2560000
http://example.com/mid.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=7680000
http://example.com/hi.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=65000,CODECS="mp4a.40.5"
http://example.com/audio-only.m3u8

func NewMasterPlaylist 

func NewMasterPlaylist() *MasterPlaylist

NewMasterPlaylist creates a new empty master playlist. Master playlist consists of variants.

func (*MasterPlaylist) Append 

func (p *MasterPlaylist) Append(uri string, chunklist *MediaPlaylist, params VariantParams)

Append appends a variant to master playlist. This operation does reset playlist cache.

func (*MasterPlaylist) Decode 

func (p *MasterPlaylist) Decode(data bytes.Buffer, strict bool) error

Decode parses a master playlist passed from the buffer. If `strict` parameter is true then it returns first syntax error.

func (*MasterPlaylist) DecodeFrom 

func (p *MasterPlaylist) DecodeFrom(reader io.Reader, strict bool) error

DecodeFrom parses a master playlist passed from the io.Reader stream. If `strict` parameter is true then it returns first syntax error.

func (*MasterPlaylist) Encode 

func (p *MasterPlaylist) Encode() *bytes.Buffer

Encode generates the output in M3U8 format.

func (*MasterPlaylist) IndependentSegments 

func (p *MasterPlaylist) IndependentSegments() bool

IndependentSegments returns true if all media samples in a segment can be decoded without information from other buf.

func (*MasterPlaylist) ResetCache 

func (p *MasterPlaylist) ResetCache()

ResetCache resetes the playlist' cache.

func (*MasterPlaylist) SetCustomTag 

func (p *MasterPlaylist) SetCustomTag(tag CustomTag)

SetCustomTag sets the provided tag on the master playlist for its TagName

func (*MasterPlaylist) SetIndependentSegments 

func (p *MasterPlaylist) SetIndependentSegments(b bool)

SetIndependentSegments sets whether all media samples in a segment can be decoded without information from other buf.

func (*MasterPlaylist) SetVersion 

func (p *MasterPlaylist) SetVersion(ver uint8)

SetVersion sets the playlist version number, note the version maybe changed automatically by other Set methods.

func (*MasterPlaylist) String 

func (p *MasterPlaylist) String() string

String here for compatibility with Stringer interface. For example fmt.Printf("%s", sampleMediaList) will encode playist and print its string representation.

Example

Create new master playlist Add media playlist Encode structures to HLS 

m := NewMasterPlaylist()
p, _ := NewMediaPlaylist(3, 5)
for i := 0; i < 5; i++ {
	p.Append(fmt.Sprintf("test%d.ts", i), 5.0, "", "")
}
m.Append("chunklist1.m3u8", p, VariantParams{ProgramId: 123, Bandwidth: 1500000, AverageBandwidth: 1500000, Resolution: "576x480", FrameRate: 25.000})
m.Append("chunklist2.m3u8", p, VariantParams{ProgramId: 123, Bandwidth: 1500000, AverageBandwidth: 1500000, Resolution: "576x480", FrameRate: 25.000})
fmt.Printf("%s", m)

Output:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:PROGRAM-ID=123,BANDWIDTH=1500000,AVERAGE-BANDWIDTH=1500000,RESOLUTION=576x480,FRAME-RATE=25.000
chunklist1.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=123,BANDWIDTH=1500000,AVERAGE-BANDWIDTH=1500000,RESOLUTION=576x480,FRAME-RATE=25.000
chunklist2.m3u8
Example (With_hlsv7) 
m := NewMasterPlaylist()
m.SetVersion(7)
m.SetIndependentSegments(true)
p, _ := NewMediaPlaylist(3, 5)
m.Append("hdr10_1080/prog_index.m3u8", p, VariantParams{AverageBandwidth: 7964551, Bandwidth: 12886714, VideoRange: "PQ", Codecs: "hvc1.2.4.L123.B0", Resolution: "1920x1080", FrameRate: 23.976, Captions: "NONE", HDCPLevel: "TYPE-0"})
m.Append("hdr10_1080/iframe_index.m3u8", p, VariantParams{Iframe: true, AverageBandwidth: 364552, Bandwidth: 905053, VideoRange: "PQ", Codecs: "hvc1.2.4.L123.B0", Resolution: "1920x1080", HDCPLevel: "TYPE-0"})
fmt.Printf("%s", m)

Output:

#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-STREAM-INF:PROGRAM-ID=0,BANDWIDTH=12886714,AVERAGE-BANDWIDTH=7964551,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1920x1080,CLOSED-CAPTIONS=NONE,FRAME-RATE=23.976,VIDEO-RANGE=PQ,HDCP-LEVEL=TYPE-0
hdr10_1080/prog_index.m3u8
#EXT-X-I-FRAME-STREAM-INF:PROGRAM-ID=0,BANDWIDTH=905053,AVERAGE-BANDWIDTH=364552,CODECS="hvc1.2.4.L123.B0",RESOLUTION=1920x1080,VIDEO-RANGE=PQ,HDCP-LEVEL=TYPE-0,URI="hdr10_1080/iframe_index.m3u8"

func (*MasterPlaylist) Version 

func (p *MasterPlaylist) Version() uint8

Version returns the current playlist version number

func (*MasterPlaylist) WithCustomDecoders 

func (p *MasterPlaylist) WithCustomDecoders(customDecoders []CustomDecoder) Playlist

WithCustomDecoders adds custom tag decoders to the master playlist for decoding

type MediaPlaylist 

type MediaPlaylist struct {
	TargetDuration   float64
	SeqNo            uint64 // EXT-X-MEDIA-SEQUENCE
	Segments         []*MediaSegment
	Args             string // optional arguments placed after URIs (URI?Args)
	Iframe           bool   // EXT-X-I-FRAMES-ONLY
	Closed           bool   // is this VOD (closed) or Live (sliding) playlist?
	MediaType        MediaType
	DiscontinuitySeq uint64 // EXT-X-DISCONTINUITY-SEQUENCE
	StartTime        float64
	StartTimePrecise bool

	Key    *Key // EXT-X-KEY is optional encryption key displayed before any segments (default key for the playlist)
	Map    *Map // EXT-X-MAP is optional tag specifies how to obtain the Media Initialization Section (default map for the playlist)
	WV     *WV  // Widevine related tags outside of M3U8 specs
	Custom map[string]CustomTag
	// contains filtered or unexported fields
}

MediaPlaylist structure represents a single bitrate playlist aka media playlist. It related to both a simple media playlists and a sliding window media playlists. URI lines in the Playlist point to media segments.

Simple Media Playlist file sample: 

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:5220
#EXTINF:5219.2,
http://media.example.com/entire.ts
#EXT-X-ENDLIST

Sample of Sliding Window Media Playlist, using HTTPS: 

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:8
#EXT-X-MEDIA-SEQUENCE:2680

#EXTINF:7.975,
https://priv.example.com/fileSequence2680.ts
#EXTINF:7.941,
https://priv.example.com/fileSequence2681.ts
#EXTINF:7.975,
https://priv.example.com/fileSequence2682.ts

func NewMediaPlaylist 

func NewMediaPlaylist(winsize uint, capacity uint) (*MediaPlaylist, error)

NewMediaPlaylist creates a new media playlist structure. Winsize defines how much items will displayed on playlist generation. Capacity is total size of a playlist.

func (*MediaPlaylist) Append 

func (p *MediaPlaylist) Append(uri string, duration float64, title string, logo string) error

Append general chunk to the tail of chunk slice for a media playlist. This operation does reset playlist cache.

func (*MediaPlaylist) AppendSegment 

func (p *MediaPlaylist) AppendSegment(seg *MediaSegment) error

AppendSegment appends a MediaSegment to the tail of chunk slice for a media playlist. This operation does reset playlist cache.

func (*MediaPlaylist) Close 

func (p *MediaPlaylist) Close()

Close sliding playlist and make them fixed.

func (*MediaPlaylist) Count 

func (p *MediaPlaylist) Count() uint

Count tells us the number of items that are currently in the media playlist.

func (*MediaPlaylist) Decode 

func (p *MediaPlaylist) Decode(data bytes.Buffer, strict bool) error

Decode parses a media playlist passed from the buffer. If `strict` parameter is true then return first syntax error.

func (*MediaPlaylist) DecodeFrom 

func (p *MediaPlaylist) DecodeFrom(reader io.Reader, strict bool) error

DecodeFrom parses a media playlist passed from the io.Reader stream. If `strict` parameter is true then it returns first syntax error.

func (*MediaPlaylist) DurationAsInt 

func (p *MediaPlaylist) DurationAsInt(yes bool)

DurationAsInt represents the duration as the integer in encoded playlist.

Example

Example of parsing a playlist with EXT-X-DISCONTINIUTY tag and output it with integer segment durations. 

f, _ := os.Open("sample-playlists/media-playlist-with-discontinuity.m3u8")
p, _, _ := DecodeFrom(bufio.NewReader(f), true)
pp := p.(*MediaPlaylist)
pp.DurationAsInt(true)
fmt.Printf("%s", pp)

Output:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-TARGETDURATION:10
#EXTINF:10,
ad0.ts
#EXTINF:8,
ad1.ts
#EXT-X-DISCONTINUITY
#EXTINF:10,
movieA.ts
#EXTINF:10,
movieB.ts

func (*MediaPlaylist) Encode 

func (p *MediaPlaylist) Encode() *bytes.Buffer

Encode generates output in M3U8 format. Marshal `winsize` elements from bottom of the `buf` queue.

func (*MediaPlaylist) GetAllSegments 

func (p *MediaPlaylist) GetAllSegments() []*MediaSegment

GetAllSegments could get all segments currently added to playlist.

func (*MediaPlaylist) Remove 

func (p *MediaPlaylist) Remove() (err error)

Remove current segment from the head of chunk slice form a media playlist. Useful for sliding playlists. This operation does reset playlist cache.

func (*MediaPlaylist) ResetCache 

func (p *MediaPlaylist) ResetCache()

ResetCache resets playlist cache. Next called Encode() will regenerate playlist from the chunk slice.

func (*MediaPlaylist) SetCustomSegmentTag 

func (p *MediaPlaylist) SetCustomSegmentTag(tag CustomTag) error

SetCustomSegmentTag sets the provided tag on the current media segment for its TagName.

func (*MediaPlaylist) SetCustomTag 

func (p *MediaPlaylist) SetCustomTag(tag CustomTag)

SetCustomTag sets the provided tag on the media playlist for its TagName.

func (*MediaPlaylist) SetDefaultKey 

func (p *MediaPlaylist) SetDefaultKey(method, uri, iv, keyformat, keyformatversions string) error

SetDefaultKey sets encryption key appeared once in header of the playlist (pointer to MediaPlaylist.Key). It useful when keys not changed during playback. Set tag for the whole list.

func (*MediaPlaylist) SetDefaultMap 

func (p *MediaPlaylist) SetDefaultMap(uri string, limit, offset int64)

SetDefaultMap sets default Media Initialization Section values for playlist (pointer to MediaPlaylist.Map). Set EXT-X-MAP tag for the whole playlist.

func (*MediaPlaylist) SetDiscontinuity 

func (p *MediaPlaylist) SetDiscontinuity() error

SetDiscontinuity sets discontinuity flag for the current media segment. EXT-X-DISCONTINUITY indicates an encoding discontinuity between the media segment that follows it and the one that preceded it (i.e. file format, number and type of tracks, encoding parameters, encoding sequence, timestamp sequence).

func (*MediaPlaylist) SetIframeOnly 

func (p *MediaPlaylist) SetIframeOnly()

SetIframeOnly marks medialist as consists of only I-frames (Intra frames). Set tag for the whole list.

func (*MediaPlaylist) SetKey 

func (p *MediaPlaylist) SetKey(method, uri, iv, keyformat, keyformatversions string) error

SetKey sets encryption key for the current segment of media playlist (pointer to Segment.Key).

func (*MediaPlaylist) SetMap 

func (p *MediaPlaylist) SetMap(uri string, limit, offset int64) error

SetMap sets map for the current segment of media playlist (pointer to Segment.Map).

func (*MediaPlaylist) SetProgramDateTime 

func (p *MediaPlaylist) SetProgramDateTime(value time.Time) error

SetProgramDateTime sets program date and time for the current media segment. EXT-X-PROGRAM-DATE-TIME tag associates the first sample of a media segment with an absolute date and/or time. It applies only to the current media segment. Date/time format is YYYY-MM-DDThh:mm:ssZ (ISO8601) and includes time zone.

func (*MediaPlaylist) SetRange 

func (p *MediaPlaylist) SetRange(limit, offset int64) error

SetRange sets limit and offset for the current media segment (EXT-X-BYTERANGE support for protocol version 4).

func (*MediaPlaylist) SetSCTE deprecated 

func (p *MediaPlaylist) SetSCTE(cue string, id string, time float64) error

SetSCTE sets the SCTE cue format for the current media segment.

Deprecated: Use SetSCTE35 instead.

func (*MediaPlaylist) SetSCTE35 

func (p *MediaPlaylist) SetSCTE35(scte35 *SCTE) error

SetSCTE35 sets the SCTE cue format for the current media segment

func (*MediaPlaylist) SetVersion 

func (p *MediaPlaylist) SetVersion(ver uint8)

SetVersion sets the playlist version number, note the version maybe changed automatically by other Set methods.

func (*MediaPlaylist) SetWinSize 

func (p *MediaPlaylist) SetWinSize(winsize uint) error

SetWinSize overwrites the playlist's window size.

func (*MediaPlaylist) Slide 

func (p *MediaPlaylist) Slide(uri string, duration float64, title string)

Slide combines two operations: firstly it removes one chunk from the head of chunk slice and move pointer to next chunk. Secondly it appends one chunk to the tail of chunk slice. Useful for sliding playlists. This operation does reset cache.

func (*MediaPlaylist) String 

func (p *MediaPlaylist) String() string

String here for compatibility with Stringer interface For example fmt.Printf("%s", sampleMediaList) will encode playist and print its string representation.

Example

Create new media playlist Add two segments to media playlist Print it 

p, _ := NewMediaPlaylist(1, 2)
p.Append("test01.ts", 5.0, "", "")
p.Append("test02.ts", 6.0, "", "")
fmt.Printf("%s\n", p)

Output:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-TARGETDURATION:6
#EXTINF:5.000,
test01.ts

func (*MediaPlaylist) Version 

func (p *MediaPlaylist) Version() uint8

Version returns the current playlist version number

func (*MediaPlaylist) WinSize 

func (p *MediaPlaylist) WinSize() uint

WinSize returns the playlist's window size.

func (*MediaPlaylist) WithCustomDecoders 

func (p *MediaPlaylist) WithCustomDecoders(customDecoders []CustomDecoder) Playlist

WithCustomDecoders adds custom tag decoders to the media playlist for decoding

type MediaSegment 

type MediaSegment struct {
	SeqId           uint64
	Title           string // optional second parameter for EXTINF tag
	URI             string
	Duration        float64   // first parameter for EXTINF tag; duration must be integers if protocol version is less than 3 but we are always keep them float
	Limit           int64     // EXT-X-BYTERANGE <n> is length in bytes for the file under URI
	Offset          int64     // EXT-X-BYTERANGE [@o] is offset from the start of the file under URI
	Key             *Key      // EXT-X-KEY displayed before the segment and means changing of encryption key (in theory each segment may have own key)
	Map             *Map      // EXT-X-MAP displayed before the segment
	Discontinuity   bool      // EXT-X-DISCONTINUITY indicates an encoding discontinuity between the media segment that follows it and the one that preceded it (i.e. file format, number and type of tracks, encoding parameters, encoding sequence, timestamp sequence)
	SCTE            *SCTE     // SCTE-35 used for Ad signaling in HLS
	ProgramDateTime time.Time // EXT-X-PROGRAM-DATE-TIME tag associates the first sample of a media segment with an absolute date and/or time
	Custom          map[string]CustomTag
}

MediaSegment structure represents a media segment included in a media playlist. Media segment may be encrypted. Widevine supports own tags for encryption metadata.

type MediaType 

type MediaType uint

MediaType is the type for EXT-X-PLAYLIST-TYPE tag 

const (
	// use 0 for not defined type
	EVENT MediaType = iota + 1
	VOD
)

type Playlist 

type Playlist interface {
	Encode() *bytes.Buffer
	Decode(bytes.Buffer, bool) error
	DecodeFrom(reader io.Reader, strict bool) error
	WithCustomDecoders([]CustomDecoder) Playlist
	String() string
}

Playlist interface applied to various playlist types.

type SCTE 

type SCTE struct {
	Syntax  SCTE35Syntax  // Syntax defines the format of the SCTE-35 cue tag
	CueType SCTE35CueType // CueType defines whether the cue is a start, mid, end (if applicable)
	Cue     string
	ID      string
	Time    float64
	Elapsed float64
}

SCTE holds custom, non EXT-X-DATERANGE, SCTE-35 tags

type SCTE35CueType 

type SCTE35CueType uint

SCTE35CueType defines the type of cue point, used by readers and writers to write a different syntax 

const (
	SCTE35Cue_Start SCTE35CueType = iota // SCTE35Cue_Start indicates an out cue point
	SCTE35Cue_Mid                        // SCTE35Cue_Mid indicates a segment between start and end cue points
	SCTE35Cue_End                        // SCTE35Cue_End indicates an in cue point
)

type SCTE35Syntax 

type SCTE35Syntax uint

SCTE35Syntax defines the format of the SCTE-35 cue points which do not use the draft-pantos-http-live-streaming-19 EXT-X-DATERANGE tag and instead have their own custom tags 

const (
	// SCTE35_67_2014 will be the default due to backwards compatibility reasons.
	SCTE35_67_2014 SCTE35Syntax = iota // SCTE35_67_2014 defined in http://www.scte.org/documents/pdf/standards/SCTE%2067%202014.pdf
	SCTE35_OATCLS                      // SCTE35_OATCLS is a non-standard but common format
)

type Variant 

type Variant struct {
	URI       string
	Chunklist *MediaPlaylist
	VariantParams
}

Variant structure represents variants for master playlist. Variants included in a master playlist and point to media playlists.

type VariantParams 

type VariantParams struct {
	ProgramId        uint32
	Bandwidth        uint32
	AverageBandwidth uint32 // EXT-X-STREAM-INF only
	Codecs           string
	Resolution       string
	Audio            string // EXT-X-STREAM-INF only
	Video            string
	Subtitles        string // EXT-X-STREAM-INF only
	Captions         string // EXT-X-STREAM-INF only
	Name             string // EXT-X-STREAM-INF only (non standard Wowza/JWPlayer extension to name the variant/quality in UA)
	Iframe           bool   // EXT-X-I-FRAME-STREAM-INF
	VideoRange       string
	HDCPLevel        string
	FrameRate        float64        // EXT-X-STREAM-INF
	Alternatives     []*Alternative // EXT-X-MEDIA
}

VariantParams structure represents additional parameters for a variant used in EXT-X-STREAM-INF and EXT-X-I-FRAME-STREAM-INF

type WV 

type WV struct {
	AudioChannels          uint
	AudioFormat            uint
	AudioProfileIDC        uint
	AudioSampleSize        uint
	AudioSamplingFrequency uint
	CypherVersion          string
	ECM                    string
	VideoFormat            uint
	VideoFrameRate         uint
	VideoLevelIDC          uint
	VideoProfileIDC        uint
	VideoResolution        string
	VideoSAR               string
}

WV structure represents metadata for Google Widevine playlists. This format not described in IETF draft but provied by Widevine Live Packager as additional tags with #WV-prefix.

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