m3u8

package module
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 Go to latest Published: Dec 6, 2020 License: BSD-3-Clause Imports: 11 Imported by: 24

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.

Install

go get github.com/grafov/m3u8

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

Documentation Go Walker

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.Add(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())

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:

M3U8 parsing/generation in other languages

Project status Go Report Card

Build Status Build Status Coverage Status

Project maintainers:

  • Bradley Falzon @bradleyfalzon
  • Alexander Grafov @grafov

Development rules:

  • After complete testing and one week usage with my prober for HLS Stream Surfer it may be released as new library version.
  • Each new API call or M3U8 tag accompanied by at least with one unit test till new release (this rule will be apply after v1.0).
  • Versioning scheme follows http://semver.org rules (but versions till v1.0 not support bacward compatibility, see release notes carefully).

Project dashboard: https://waffle.io/grafov/m3u8 Stories in Ready

State of code coverage: https://gocover.io/github.com/grafov/m3u8

Roadmap

To version 1.0:

  • Support all M3U8 tags up to latest version of specs.
  • Code coverage by unit tests up to 90%

Documentation

Overview 

Package M3U8 is parser & generator library for Apple HLS.

This is a 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 did not offer ways to play HLS or handle playlists over HTTP. 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 usage with DRM systems like Verimatrix (http://verimatrix.com) etc.
  • Support for non standard Google Widevine (http://www.widevine.com) tags.

Library coded accordingly with IETF draft http://tools.ietf.org/html/draft-pantos-http-live-streaming

Examples of usage may be found in *_test.go files of a package. Also see below some simple examples.

Create simple media playlist with sliding window of 3 segments and maximum of 50 segments. 

p, e := NewMediaPlaylist(3, 50)
if e != nil {
  panic(fmt.Sprintf("Create media playlist failed: %s", e))
}
for i := 0; i < 5; i++ {
  e = p.Add(fmt.Sprintf("test%d.ts", i), 5.0)
  if e != nil {
    panic(fmt.Sprintf("Add segment #%d to a media playlist failed: %s", i, e))
  }
}
fmt.Println(p.Encode(true).String())

We add 5 testX.ts segments to playlist then encode it to M3U8 format and convert to string.

Next example shows parsing of master playlist: 

f, err := os.Open("sample-playlists/master.m3u8")
if err != nil {
  fmt.Println(err)
}
p := NewMasterPlaylist()
err = p.DecodeFrom(bufio.NewReader(f), false)
if err != nil {
  fmt.Println(err)
}

fmt.Printf("Playlist object: %+v\n", p)

We are open playlist from the file and parse it as master playlist.

Index

Examples

Constants

View Source 
const (
	DATETIME = time.RFC3339Nano // Format for EXT-X-PROGRAM-DATE-TIME defined in section 3.4.5
)

Variables

View Source 
var (
	ErrPlaylistFull         = errors.New("playlist is full")
	ErrSegmentAlreadyExists = errors.New("segment already exists")
)
View Source 
var TimeParse func(value string) (time.Time, error) = FullTimeParse

Allow 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 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 FullTimeParse added in v0.11.0 

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

FullTimeParse implements ISO/IEC 8601:2004.

func StrictTimeParse added in v0.11.0 

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

type Map added in v0.3.1 

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
}

It applies 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)
	// 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 create new empty master playlist. Master playlist consists of variants.

func (*MasterPlaylist) Append 

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

Append 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

Generate output in M3U8 format.

func (*MasterPlaylist) ResetCache 

func (p *MasterPlaylist) ResetCache()

func (*MasterPlaylist) SetVersion added in v0.11.0 

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 added in v0.3.1 

func (p *MasterPlaylist) String() string

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, Resolution: "576x480"})
m.Append("chunklist2.m3u8", p, VariantParams{ProgramId: 123, Bandwidth: 1500000, Resolution: "576x480"})
fmt.Printf("%s", m)

Output:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:PROGRAM-ID=123,BANDWIDTH=1500000,RESOLUTION=576x480
chunklist1.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=123,BANDWIDTH=1500000,RESOLUTION=576x480
chunklist2.m3u8

func (*MasterPlaylist) Version added in v0.11.0 

func (p *MasterPlaylist) Version() uint8

Version returns the current playlist version number

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
	Live           bool   // is this a VOD or Live (sliding window) playlist?
	MediaType      MediaType

	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
	// 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 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) error

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

func (*MediaPlaylist) AppendSegment added in v0.11.0 

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 added in v0.3.2 

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)

TargetDuration will be int on Encode

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

Generate output in M3U8 format. Marshal `winsize` elements from bottom of the `segments` queue.

func (*MediaPlaylist) InsertSegment added in v0.11.0 

func (p *MediaPlaylist) InsertSegment(seqNo uint64, seg *MediaSegment) error

InsertSegment inserts a MediaSegment to the correct index (by resorting the segments) according to SeqNo. This is because in a live streaming scenario, segments can arrive out-of-order. This operation does reset playlist cache (by calling AppendSegment). Invariant: Internal segment list is always sorted

func (*MediaPlaylist) Len added in v0.11.0 

func (p *MediaPlaylist) Len() int

methods for pkg.Sort interface

func (*MediaPlaylist) Less added in v0.11.0 

func (p *MediaPlaylist) Less(i, j int) bool

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()

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

func (*MediaPlaylist) SetDefaultKey 

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

Set 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 added in v0.3.1 

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

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

func (*MediaPlaylist) SetDiscontinuity 

func (p *MediaPlaylist) SetDiscontinuity() error

Set 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 added in v0.3.1 

func (p *MediaPlaylist) SetIframeOnly()

Mark 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

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

func (*MediaPlaylist) SetMap added in v0.3.1 

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

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

func (*MediaPlaylist) SetProgramDateTime 

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

Set 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

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

func (*MediaPlaylist) SetSCTE deprecated added in v0.11.0 

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 added in v0.11.0 

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

SetSCTE35 sets the SCTE cue format for the current media segment

func (*MediaPlaylist) SetVersion added in v0.11.0 

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 added in v0.11.0 

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)

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 added in v0.3.1 

func (p *MediaPlaylist) String() string

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) Swap added in v0.11.0 

func (p *MediaPlaylist) Swap(i, j int)

func (*MediaPlaylist) Version added in v0.11.0 

func (p *MediaPlaylist) Version() uint8

Version returns the current playlist version number

func (*MediaPlaylist) WinSize added in v0.11.0 

func (p *MediaPlaylist) WinSize() uint

WinSize returns the playlist's window size.

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
}

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

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
	String() string
}

Playlist interface applied to various playlist types.

type SCTE added in v0.11.0 

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 added in v0.11.0 

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 added in v0.11.0 

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
	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
	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
}

This 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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