Method of and device for changing an output rate

1. A method of changing an output rate of information for a buffer from a first constant output rate to a second constant output rate, where the buffer receives output data from a processing data source, and the output data is stored in the buffer, the method comprising:

the processing data source halting the addition of output data to the buffer and discarding input data;

outputting the stored output data of the buffer at the first output rate until the buffer is substantially empty;

stopping outputting of the output data of the buffer;

on the condition that the buffer is substantially empty, the processing data source resuming the addition of output data to the buffer, and the buffer resuming storing the output data;

setting a second constant output rate as the output rate of the buffer; and

commencing output of the stored output data of the buffer at the second output rate, when the amount of buffered data is substantially equal to the second constant output rate multiplied by a requested buffer time.

2. A method according to claim 1 , wherein the processing data source specifies the second constant output rate and the requested buffer time.

3. A method according to claim 1 , wherein the resuming of the addition of the output data and storing of the output data is initiated when the buffer is empty.

4. A method according to claim 1 , wherein the

processing data source is a software application adapted to receive and process input data and output the output data.

5. A method according to claim 1 , wherein the

buffer is a hardware buffer.

6. A method according to claim 1 , wherein the

output data are MPEG2 compliant elementary streams and the processing data source is adapted to multiplex the MPEG2 streams into a transport stream.

7. A computer readable storage medium including a set of instructions operable by a processor, the instructions comprising:

a receive output data code segment for receiving output data from a processing data source into a buffer having a first constant output rate;

an add and store output data code segment for adding and storing the output data in the buffer;

a change output data code segment for changing the output rate of information from the buffer from the first constant output rate to a second constant output rate;

a stop output data addition code segment for stopping the addition of output data by the processing data source to the buffer;

a discard output data code segment for discarding of input data by the processing data source;

an output data code segment for outputting the stored output data of the buffer at the first output rate until the buffer is substantially empty;

a stop output data code segment for stopping outputting of the output data of the buffer;

a resume output data code segment for resuming addition of output data by the processing data source to the buffer, and resuming storing the output data by the buffer;

a set output data code segment for setting the second constant output rate as the output rate of the buffer; and

a commence output data code segment for commencing output of the stored output data of said buffer at the second constant output rate, when the amount of buffered data is equal to the second constant output rate times a requested buffer time.

8. A computer readable storage medium according to claim 7 , wherein the instructions further comprise a second constant output rate specification code segment for specifying the second constant output rate and the requested buffer time for the buffer.

9. A computer readable storage medium according to claim 7 , wherein the instructions further comprise a resume specification code segment for resuming the addition of output data by the processing data source to the buffer, and resume storing the output data by the buffer when the buffer is empty.