System for digital stream transmission and method thereof

• US 7,047,330 B2
• Filed: 03/06/2001
• Issued: 05/16/2006
• Est. Priority Date: 03/06/2001
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: ATI Technologies Incorporated (Advanced Micro Devices, Inc.)
• Inventors: Kovacevic, Branko D.
• Primary Examiner(s): Huynh, Kim
• Assistant Examiner(s): Chen, Alan S.
• Application Number:
  US09/800,223
• Publication Number:
  US 20020178274A1
• Time in Patent Office: 1,897 Days
• Field of Search: 710/52, 710/53, 710/54, 710/55, 710/56, 710/57, 710/58, 710/60, 710/29
• US Class Current: 710/58
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 69/326 in the transport layer [OSI layer 4] H04L69/16 takes precedence
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A system and methods are shown for generating a transport stream. An application reads a transport stream file stored in memory. The application provides access to the transport stream file to a graphics card using a multimedia peripheral port (MPP). The MPP is used to provide data from the transport stream file to a transport stream demultiplexer. The application determines a desired transmission rate from the data present between program clock references in the transport stream file. The application suspends transmissions to the transport stream demultiplexer to allow a transmission bit-rate to match the desired bit-rate. The application also suspends transmission when the receiving transport demultiplexer determines its buffers are nearly full.

Claims

1. A method comprising:

reading data from a file;

setting a transmit bit-rate to a first bit-rate;

sending a transport stream based on the data to a demultiplexer at the transmit bit-rate;

determining a number of transmitted bits between two program clock references in a common program stream, wherein the program clock references are read from the transport stream;

determining a desired elapsed time between the two program clock references;

determining a desired bit-rate based on the desired elapsed time and the number of transmitted bits; and

setting the transmit bit-rate to the desired bit-rate.

2. The method as in claim 1, wherein the transmit bit-rate is determined by calculating an average number of bits associated with the transport stream sent to the demultiplexer per unit time.

3. The method as in claim 1, wherein the common program stream is determined by parsing program stream information tables to determine a program identifier of a particular program stream.

4. The method as in claim 1, wherein the common program stream is determined by parsing program map tables to determine a program identifier of a particular program stream.

5. The method as in claim 1, wherein setting the transmit bit-rate to the desired bit-rate includes indicating that transmission of a portion of the transport stream should be delayed.

6. A system comprising:

means for reading data from a file;

means for setting a transmit bit-rate to a first bit-rate;

means for sending a transport stream based on the data to a demultiplexer at the transmit bit-rate;

means for determining a number of transmitted bits between two program clock references in a common program stream, wherein the program clock references are read from the transport stream;

means for determining a desired elapsed time between the two program clock references;

means for determining a desired bit-rate based on the desired elapsed time and the number of transmitted bits; and

means for setting the transmit bit-rate to the desired bit-rate.

7. The system of claim 6, wherein the transmit bit-rate is determined by calculating an average number of bits associated with the transport stream sent to the demultiplexer per unit time.

8. The system of claim 7, wherein the common program stream is determined by parsing program stream information tables to determine a program identifier of a particular program stream.

9. The system of claim 7, wherein the common program stream is determined by parsing program map tables to determine a program identifier of a particular program stream.

10. The system of claim 7, wherein setting the transmit bit-rate to the desired bit-rate includes indicating that transmission of a portion of the transport stream should be delayed.