HLS流媒体协议描述文档

HTTP

Live

需积分: 9 31 浏览量更新于2023-03-16 收藏 141KB PDF 举报

身份认证购VIP最低享 7 折!

领优惠券(最高得80元）

资源详情

资源推荐

Informational R. Pantos, Ed.

Internet-Draft W. May

Intended status: Informational Apple Inc.

Expires: April 17, 2015 October 14, 2014

HTTP Live Streaming

draft-pantos-http-live-streaming-14

Abstract

This document describes a protocol for transferring unbounded streams

of multimedia data. It specifies the data format of the files and

the actions to be taken by the server (sender) and the clients

(receivers) of the streams. It describes version 7 of this protocol.

Status of This Memo

This Internet-Draft is submitted in full conformance with the

provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering

Task Force (IETF). Note that other groups may also distribute

working documents as Internet-Drafts. The list of current Internet-

Drafts is at

http://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months

and may be updated, replaced, or obsoleted by other documents at any

time. It is inappropriate to use Internet-Drafts as reference

material or to cite them other than as "work in progress."

This Internet-Draft will expire on April 17, 2015.

This document is subject to

BCP 78 and the IETF Trust’s Legal

Provisions Relating to IETF Documents

(

http://trustee.ietf.org/license-info) in effect on the date of

publication of this document. Please review these documents

carefully, as they describe your rights and restrictions with respect

to this document.

This document may not be modified, and derivative works of it may not

be created, and it may not be published except as an Internet-Draft.

Pantos & May Expires April 17, 2015 [Page 1]

Internet-Draft HTTP Live Streaming October 2014

This Informational Internet Draft is submitted as an RFC Editor

Contribution and/or non-IETF Document (not as a Contribution, IETF

Contribution, nor IETF Document) in accordance with

BCP 78 and BCP

79.

Table of Contents

1. Introduction to HTTP Live Streaming . . . . . . . . . . . . . 3

2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3. Media Segments . . . . . . . . . . . . . . . . . . . . . . . 5

4. Playlists . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.1. Definition of a Playlist . . . . . . . . . . . . . . . . 7

4.2. Attribute Lists . . . . . . . . . . . . . . . . . . . . . 8

4.3. Playlist Tags . . . . . . . . . . . . . . . . . . . . . . 9

4.3.1. Basic Tags . . . . . . . . . . . . . . . . . . . . . 9

4.3.1.1. EXTM3U . . . . . . . . . . . . . . . . . . . . . 9

4.3.1.2. EXT-X-VERSION . . . . . . . . . . . . . . . . . . 9

4.3.2. Media Segment Tags . . . . . . . . . . . . . . . . . 10

4.3.2.1. EXTINF . . . . . . . . . . . . . . . . . . . . . 10

4.3.2.2. EXT-X-BYTERANGE . . . . . . . . . . . . . . . . . 11

4.3.2.3. EXT-X-DISCONTINUITY . . . . . . . . . . . . . . . 11

4.3.2.4. EXT-X-KEY . . . . . . . . . . . . . . . . . . . . 12

4.3.2.5. EXT-X-MAP . . . . . . . . . . . . . . . . . . . . 13

4.3.2.6. EXT-X-PROGRAM-DATE-TIME . . . . . . . . . . . . . 14

4.3.3. Media Playlist Tags . . . . . . . . . . . . . . . . . 15

4.3.3.1. EXT-X-TARGETDURATION . . . . . . . . . . . . . . 15

4.3.3.2. EXT-X-MEDIA-SEQUENCE . . . . . . . . . . . . . . 15

4.3.3.3. EXT-X-DISCONTINUITY-SEQUENCE . . . . . . . . . . 16

4.3.3.4. EXT-X-ENDLIST . . . . . . . . . . . . . . . . . . 16

4.3.3.5. EXT-X-PLAYLIST-TYPE . . . . . . . . . . . . . . . 16

4.3.3.6. EXT-X-I-FRAMES-ONLY . . . . . . . . . . . . . . . 17

4.3.4. Master Playlist Tags . . . . . . . . . . . . . . . . 17

4.3.4.1. EXT-X-MEDIA . . . . . . . . . . . . . . . . . . . 18

4.3.4.1.1. Rendition Groups . . . . . . . . . . . . . . 20

4.3.4.2. EXT-X-STREAM-INF . . . . . . . . . . . . . . . . 21

4.3.4.2.1. Alternative Renditions . . . . . . . . . . . 24

4.3.4.3. EXT-X-I-FRAME-STREAM-INF . . . . . . . . . . . . 24

4.3.4.4. EXT-X-SESSION-DATA . . . . . . . . . . . . . . . 25

4.3.5. Media or Master Playlist Tags . . . . . . . . . . . . 26

4.3.5.1. EXT-X-INDEPENDENT-SEGMENTS . . . . . . . . . . . 26

4.3.5.2. EXT-X-START . . . . . . . . . . . . . . . . . . . 26

5. Key files . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.1. Structure of Key files . . . . . . . . . . . . . . . . . 27

5.2. IV for [AES_128] . . . . . . . . . . . . . . . . . . . . 27

6. Client/Server Responsibilities . . . . . . . . . . . . . . . 28

6.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 28

6.2. Server Responsibilities . . . . . . . . . . . . . . . . . 28

Pantos & May Expires April 17, 2015 [Page 2]

Internet-Draft HTTP Live Streaming October 2014

6.2.1. General Server Responsibilities . . . . . . . . . . . 28

6.2.2. Live Playlists . . . . . . . . . . . . . . . . . . . 30

6.2.3. Encrypting Media Segments . . . . . . . . . . . . . . 31

6.2.4. Providing Variant Streams . . . . . . . . . . . . . . 32

6.3. Client Responsibilities . . . . . . . . . . . . . . . . . 33

6.3.1. General Client Responsibilities . . . . . . . . . . . 33

6.3.2. Loading the Media Playlist file . . . . . . . . . . . 34

6.3.3. Playing the Media Playlist file . . . . . . . . . . . 34

6.3.4. Reloading the Media Playlist file . . . . . . . . . . 35

6.3.5. Determining the next segment to load . . . . . . . . 36

6.3.6. Decrypting encrypted Media Segments . . . . . . . . . 36

7. Protocol version compatibility . . . . . . . . . . . . . . . 37

8. Playlist Examples . . . . . . . . . . . . . . . . . . . . . . 39

8.1. Simple Media Playlist . . . . . . . . . . . . . . . . . . 39

8.2. Live Media Playlist, using HTTPS . . . . . . . . . . . . 39

8.3. Playlist with encrypted Media Segments . . . . . . . . . 39

8.4. Master Playlist . . . . . . . . . . . . . . . . . . . . . 40

8.5. Master Playlist with I-Frames . . . . . . . . . . . . . . 40

8.6. Master Playlist with Alternative audio . . . . . . . . . 41

8.7. Master Playlist with Alternative video . . . . . . . . . 41

8.8. Session Data in a Master Playlist . . . . . . . . . . . . 42

9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 43

10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 43

11. Security Considerations . . . . . . . . . . . . . . . . . . . 44

12. References . . . . . . . . . . . . . . . . . . . . . . . . . 44

12.1. Normative References . . . . . . . . . . . . . . . . . . 44

12.2. Informative References . . . . . . . . . . . . . . . . . 46

Authors’ Addresses . . . . . . . . . . . . . . . . . . . . . . . 47

. Introduction to HTTP Live Streaming

HTTP Live Streaming provides a reliable, cost-effective means of

delivering continuous and long-form video over the Internet. It

allows a receiver to adapt the bit rate of the media to the current

network conditions in order to maintain uninterrupted playback at the

best possible quality. It supports interstitial content boundaries.

It provides a flexible framework for media encryption. It can

efficiently offer multiple renditions of the same content, such as

audio translations. It offers compatibility with large-scale HTTP

caching infrastructure to support delivery to large audiences.

Since its first draft publication in 2009, HTTP Live Streaming has

been implemented and deployed by a wide array of content producers,

tools vendors, distributors, and device manufacturers.

The purpose of this document is to facilitate interoperability

between HTTP Live Streaming implementations by describing the media

Pantos & May Expires April 17, 2015 [Page 3]

Internet-Draft HTTP Live Streaming October 2014

A Variant Stream can also specify a set of Renditions. Renditions

are alternate versions of the content, such as audio produced in

different languages or video recorded from different camera angles.

Players can switch between the different Variant Streams and

Renditions to adapt to network conditions and user preferences.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

document are to be interpreted as described in

RFC 2119 [RFC2119].

3. Media Segments

A Media Playlist contains a series of Media Segments which make up

the overall presentation. A Media Segment is specified by a URI and

optionally a byte range.

The duration of each Media Segment is indicated in the Media Playlist

by its EXTINF tag (

Section 4.3.2.1).

Each segment in a Media Playlist has a unique integer Media Sequence

Number. The Media Sequence Number of the first segment in the

playlist is either 0, or declared in the Playlist (

Section 4.3.3.2).

The Media Sequence Number of every other segment is equal to the

Media Sequence Number of the segment that precedes it plus one.

Each Media Segment MUST be formatted as an MPEG-2 Transport Stream

[

ISO_13818], an MPEG audio elementary stream [ISO_11172], or a WebVTT

[

WebVTT] file. Transport of other media file formats is not defined.

Some media formats require that a parser be initialized with a common

sequence of bytes before a Media Segment can be parsed. This format-

specific sequence is called the Media Initialization Section. The

Media Initialization Section of an MPEG-2 Transport Stream segment is

the Program Association Table (PAT) followed by the Program Map

Table (PMT). The Media Initialization Section of a WebVTT segment is

the WebVTT header. An audio elementary stream has no Media

Initialization Section.

Transport Stream segments MUST contain a single MPEG-2 Program;

playback of Multi-Program Transport Streams is not defined. Each

Transport Stream segment SHOULD contain a PAT and a PMT at the start

of the segment - or have a Media Initialization Section declared in

the Media Playlist (

Section 4.3.2.5). Transport Stream packets read

before a corresponding PAT/PMT can be discarded.

Pantos & May Expires April 17, 2015 [Page 5]

剩余46页未读，继续阅读

安素丶

粉丝: 0
资源: 8

会员权益专享

HLS流媒体协议描述文档

HLS官方协议文档（英文版）

HLS协议规范

android 流媒体（streaming）之HLS介绍

HLS协议官方文档

HLS M3U8协议文档（英文版）

HLS流媒体传输协议简介

使用HLS协议进行流媒体传输

HLS流媒体工作原理概述

HLS流媒体端到端数据加密实现

HLS流媒体播放器的调度策略解读

.hls 进行流媒体播放和 rtsp 或 rtmp 流媒体协议的区别是什么？

hls 进行流媒体播放和 rtsp 或 rtmp 流媒体协议的区别是什么？

RTSP流和HLS流

c++ 流媒体协议 实例下载

asp.net rtsp流转hls流(二)

9.简述手机端可以使用浏览器直接播放 hls 发布的媒体流，而 PC 端为何不行?

hls java_如何使用nginx播放HLS流？

用hls流媒体测试地址，老出错Cannot read properties of undefined (reading 'setCurrentTime')

hls是什么传输协议，加密吗

ffmpeg中对于hls流的如何处理

会员权益专享

最新资源

c++ 流媒体协议实例下载