1. 1. Overview

The stream system library is a library for efficiently reading streams on CD (interleaved files, etc.).

1.1 Library configuration

Figure 1.1 shows the CD-related library structure.

Figure 1.1 CD-related library configuration

┌────────────────────────────────┐　
│ │　
│ Application │　
│ │　
└────────────────────────────────┘　
　
┌───────┐ ┏━━━━━━━━━━━┓ ┌────────┐　
│ MPEG │ ┃ Stream system ┃ │ File system │　
│ Library │ ┃ Library ┃ │ Library │　
│ │ ┃ ┏━━━┛ │ │　
│ │ ┃ ┃ ┌─── ┘ │　
│ │ ┃ ┃ │ │ │　
└───────┘ ┗━━━━━━━┛ └─────┐ │　
│ │　
┌───────────────────────┐ │ │ │　
│ CD communication interface │ │ │ │　
└───────────┬───────────┘└──┬───┘　
Software │ │　
━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━┿━━━━━━━━
Hardware │ │　
┌──────┴─────┐ ┌──────┴──────┐　
│ CD block │ │ SIMM, SCSI file │　
└────────────┘ └─────────────┘　

1.2 Functional overview of stream system

(1) Supports access to CD-ROM XA level files

• Supports access to mode 2 sectors using subheaders.
  (Access to mode 1 sector is also possible)

(2) Support various transfer methods

• The stream data on the CD can be transferred to the area of the main CPU.

• By registering the function, you can process the data while reading the stream data on the CD.

• You can freely handle the stream data read into the CD buffer.

(3) Support access by file identifier

• Since it has the same directory management function as the file system, it can be accessed by file knowledge (sequential number in the directory).

Figure 1.2 Overview of stream system

The stream system allows you to treat multiple interleaved streams as logically standing data. Each stream is distinguished by a subheader.
In the stream system, the application performs the transfer process by calling the server function. If you register a transfer function, the server function calls the transfer function instead of transferring it to the buffer. The application can transfer data while converting it using the registered transfer function.