3. Basic matters

3.1 Definition of terms and abbreviations

Table 3.1 Glossary

the term	meaning
stream	A logically continuous flow of data distinguished by subheaders.
Stream key	The key to read the stream into the CD buffer. Frame address range, file number (FN), channel number (CN), It consists of submode (SM) and coding information (CI). Mask pattern comparison pattern can be specified for submode (SM) and coding information (CI). ({SM | CI} & mask pattern == comparison pattern) Read the sector that becomes.
Stream group	A collection of multiple streams.
Final stream	The last stream played in a stream that belongs to a stream group.
Loop start stream	The return stream after playing the last stream in the stream group.
Number of loops	The number of times to move the pickup to the loop start stream after playing the last stream.
Transfer start FAD	The position of the pickup that starts transferring the data read into the CD buffer to the buffer in the program.
Transfer gate	A gate for transferring the data read into the CD buffer to a buffer in the program. By closing this, you can store the data in the stream in the CD buffer.

Figure 3.1 Stream system data flow

┌─────────┐　
│ CD drive │　
└────┬────┘　
│ Read ──┐　
↓ │　
┌─────────┐ │　
│ CD buffer │ ├ Stream access └────┬────┘ │　
│ Extraction / transfer │　
↓ ──┘　
┌─────────┐　
│ Main CPU area │　
└─────────┘　

Table 3.2 List of abbreviations

Abbreviation	meaning	explanation
GFS	general file system	File system
STM	stream	stream
StmGrpHn	stream group handle	Handle for stream group operation
StmHn	stream handle	Handle for stream operation
TrMode	transfer mode	Transfer mode
bn	buffer number	Buffer partition number
ci	coding information	Coding information
cn	chanel number	Channel number
fad	frame address	Frame address
fid	file ID	File identifier
fn	file number	File number
fname	file name	file name
frange	fad range	Playback range (frame address range)
loopstm	loop stream	Loop start stream
sinfo	sector information	Sector information
sm	sub mode	Submode

• Other terms are based on the CD communication interface and file system.

• For more information on directories, see the " Directory Operations " chapter in the File System Library.

3.2 Name restrictions

The stream system library uses the following names for function names, variable names, type names, and macro names.

Function name, variable name	ST ~ and st ~
Model name	St ~
Macro name	ST ~

The libraries required to use the stream system library use the following global symbols.

Table 3.3 Symbol name of each library

Library name	Symbol to use
File system	GF ~, gf ~, Gf ~
CD communication interface	CD ~, cd ~, Cd ~

Application programs should not use these symbols.