The development and construction of live broadcast app, and the source code of live broadcast app involves all aspects

Recently live APP The popularity of source code continues to rise , The reason is the prosperity of the live broadcast market .

live broadcast APP What can development build do ？

1. The anchor user starts the mobile live broadcast It can be set that only signed anchors can start mobile live broadcast , You can also set that all registered users have permissions When the mobile phone live broadcast is enabled, you can select the front and rear mobile phone camera devices , You can also switch during live broadcast .

2. Players and users watch mobile live broadcast Players can use their mobile phones APP Watch the live broadcast of the anchor .

3. Chat and interaction between users Users can chat with words and expressions through the chat window , The chat section uses node.js Realization .

4. Gifts between users Players can buy gifts to the anchor after recharging , Users and anchors can see the detailed list of gifts they give and receive in the user center .

Playlist

live broadcast APP The developed media player provides the following methods to access clips in playlists ：

Next Method , Jump to program （ Playlist ） The next clip in ;

Previous Method , Jump back to the previous clip in the program ;

A feature of the media player is the ability to preview every clip in the program , Use the following properties ：

PreviewMode attribute , Determines whether the media player is currently in preview mode ;

Learn about streaming media （ live broadcast APP Streaming media is required for development and construction ）

Streaming media development : The network layer (socket or st) Responsible for transmission , Protocol layer (rtmp or hls) Responsible for network packaging , Package layer (flv、ts) Responsible for encoding and decoding data encapsulation , Coding layer (h.264 and aac) Responsible for image , Audio compression .

frame : Each frame represents a still image .

GOP:（Group of Pictures） Picture group , One GOP It's a series of pictures , It's every frame , One GOP It's a collection of frames .

Live data , It's actually a set of pictures , Include I frame 、P frame 、B frame , When users watch it for the first time , Will be looking for I frame , And the player will go to the server to find the nearest I Frame feedback to the user . therefore ,GOP Cache Increased end-to-end latency , Because it has to get the latest I frame .

live broadcast APP It is difficult to develop , It's easy to say, it's quite easy .

difficult , It's because there are too many things to consider in a live broadcast , It's not something that one person can handle . Because there are many technical difficulties in live broadcasting , video / Audio processing , Graph processing , video / Audio compression ,CDN distribution , Instant messaging and other technologies , Each technology will be enough for you to learn for a few years .

There are too many things to deal with in the process from acquisition, coding and transmission to decoding and playing ： Video acquisition alone involves two aspects of data acquisition ： Audio acquisition and image acquisition , It involves various algorithms , This is a huge workload .