roman-mc/m3u8

go-m3u8

This is an actively maintained fork of go module https://github.com/NBCUDTC/midnight-hls-go-parser-src, currently using only internally for midnight-team (and any other team at peacock/NBCUniversal) but with plans to refresh the package and make it eventually public.

Golang package for m3u8 https://github.com/quangngotan95/go-m3u8, initally intended for internal use only and later made public. Golang package for m3u8 (ported m3u8 gem https://github.com/sethdeckard/m3u8)

go-m3u8 provides easy generation and parsing of m3u8 playlists defined in the HTTP Live Streaming (HLS) Internet Draft published by Apple.

• The library completely implements version 20 of the HLS Internet Draft.
• Provides parsing of an m3u8 playlist into an object model from any File, io.Reader or string.
• Provides ability to write playlist to a string via String()
• Distinction between a master and media playlist is handled automatically (single Playlist class).
• Optionally, the library can automatically generate the audio/video codecs string used in the CODEC attribute based on specified H.264, AAC, or MP3 options (such as Profile/Level).

Installation

go get github.com/NBCUDTC/midnight-hls-go-parser-src

Usage (creating playlists)

Create a master playlist and child playlists for adaptive bitrate streaming:

import (
    "github.com/etherlabsio/go-m3u8/m3u8"
    "github.com/AlekSi/pointer"
)

playlist := m3u8.NewPlaylist()

Create a new playlist item:

item := &m3u8.PlaylistItem{
    Width:      pointer.ToInt(1920),
    Height:     pointer.ToInt(1080),
    Profile:    pointer.ToString("high"),
    Level:      pointer.ToString("4.1"),
    AudioCodec: pointer.ToString("aac-lc"),
    Bandwidth:  540,
    URI:        "test.url",
}
playlist.AppendItem(item)

Add alternate audio, camera angles, closed captions and subtitles by creating MediaItem instances and adding them to the Playlist:

item := &m3u8.MediaItem{
    Type:          "AUDIO",
    GroupID:       "audio-lo",
    Name:          "Francais",
    Language:      pointer.ToString("fre"),
    AssocLanguage: pointer.ToString("spoken"),
    AutoSelect:    pointer.ToBool(true),
    Default:       pointer.ToBool(false),
    Forced:        pointer.ToBool(true),
    URI:           pointer.ToString("frelo/prog_index.m3u8"),
}
playlist.AppendItem(item)

Create a standard playlist and add MPEG-TS segments via SegmentItem. You can also specify options for this type of playlist, however these options are ignored if playlist becomes a master playlist (anything but segments added):

playlist := &m3u8.Playlist{
    Target:   12,
    Sequence: 1,
    Version:  pointer.ToInt(1),
    Cache:    pointer.ToBool(false),
    Items: []m3u8.Item{
        &m3u8.SegmentItem{
            Duration: 11,
            Segment:  "test.ts",
        },
    },
}

You can also access the playlist as a string:

var str string
str = playlist.String()
...
fmt.Print(playlist)

Alternatively you can set codecs rather than having it generated automatically:

item := &m3u8.PlaylistItem{
    Width:     pointer.ToInt(1920),
    Height:    pointer.ToInt(1080),
    Codecs:    pointer.ToString("avc1.66.30,mp4a.40.2"),
    Bandwidth: 540,
    URI:       "test.url",
}

Usage (parsing playlists)

Parse from file

playlist, err := m3u8.ReadFile("path/to/file")

Read from string

playlist, err := m3u8.ReadString(string)

Read from generic io.Reader

playlist, err := m3u8.Read(reader)

Access items in playlist:

gore> playlist.Items[0]
(*m3u8.SessionKeyItem)#EXT-X-SESSION-KEY:METHOD=AES-128,URI="https://priv.example.com/key.php?r=52"
gore> playlist.Items[1]
(*m3u8.PlaybackStart)#EXT-X-START:TIME-OFFSET=20.2

Misc

Codecs:

• Values for audio_codec (codec name): aac-lc, he-aac, mp3
• Values for profile (H.264 Profile): baseline, main, high.
• Values for level (H.264 Level): 3.0, 3.1, 4.0, 4.1.

Not all Levels and Profiles can be combined and validation is not currently implemented, consult H.264 documentation for further details.

License

MIT License - See LICENSE for details