Simplified Graph Representation of graphic Channels

Through the development of graphic channels, I carefully read digital TV data broadcast,

Abstract A chart in the mind as follows:

 

Overall model diagram:

 

 

Its DiI contains module information:

 

Ior chart:

 

 

Biop messages are classified into five types:

(1) biop: directorymessage directory message

(2) biop: filemessage object file

(3) biop: streammessage stream message

(4) biop: streamevent stream event message

(5) biop: servicegateway Business Gateway

 

Note:

When downloading an object, it is not transmitted according to the format of the table in the DVB standard, but every object

The file has only one biop: filemessage.

When parsing a file, you must offset the message header biop: filemessage.

File data.ProgramThe offset is 44 bytes.

In the actual development process, it is found that the syntax and semantics of servicegateway are different.

It is different from the description in the Protocol.

When multiple object files are transmitted in the same module, objectkey is used to differentiate them.