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Chapter 1 Introduction 1-7
■ scheduler
The scheduler sorts and schedules disk I/O, manages bit pump buffers, performs
admission control, and schedules output driver activity.
■ bit pump
The bit pump is responsible for allocating internal buffering and efficiently
transferring data between the disk and the output drivers using the internal
buffers. It is responsible for fine-grain scheduling and rate control of the output
driver. The bit pump is dependent on the particular output driver used, whether
it be for Fast Ethernet or ATM.
■ disk driver
The output driver is responsible for low-level output device management and
encapsulating outgoing data according to the rules of the output medium, and for
efficiently transferring data from the internal buffers to the output medium.
See Chapter 7 for a description of the format of output data.
■ output driver
The disk driver is responsible for efficiently transferring disk data to the fixed
internal buffers. It consists of a SCSI disk driver and a modified SCSI host adapter
driver.
The MFS components listed above are illustrated in FIGURE 1-3.
FIGURE 1-3 Media File System Components
1.3.2 Media Stream Manager
The MSM controls the video streams stored in the MFS. The MSM implements a set
of procedures that interact with the MFS to allow you to stop, start, pause, and
resume video bit streams. A central notion of the MSM is the playlist, from which
titles can be played on a time-synchronized basis. Each playlist is associated with a
player, which can be passed among multiple clients.
Disk
Driver
Buffers
Bit Pump
Output
Driver
Media File System
Layout Manager
Scheduler