Specifications

Receive MP3

data from

server

Increment the

receive

pointer

Res et the

pointer if it is

past the buffer

boundary

Is the

buffer set

to refill

Is it full

Start the

decoder

Calculate the

buffer size and

send it to

Hyper T erminal

If buffer is empty

send indiactor to

HyperTerminal

and set the buffer

to refill

Is the

buffer

full

Send indicator to

Hyper T erminal

and wait for there

to be room in the

buffer for another

receive.

Yes

Yes No

Figure 19 Program to play MP3 data that refills buffer if buffer empties

The results of this test were not very promising. The buffer emptied very quickly and

more time was spent not playing music then playing music. What was worse this model

was far from realistic, the network has a chance to catch up while there is no decoder

requesting data, then a brief period of them both happening. If it was working properly

they would both be happening together all the time. So the answer to the second

question was that there was going to have to be a massive improvement in the design

for it to start working.