Line navigation conferencing system

• US 7,085,842 B2
• Filed: 02/12/2001
• Issued: 08/01/2006
• Est. Priority Date: 02/12/2001
• Status: Expired due to Term

• Current Assignee: Ip Ot Sub Ulc
• Original Assignee: Open Text Corporation
• Inventors: Low, Murray, Anderson, Charles R., Rutta, Neal, Grant, Kenneth R., Reid, Clifford A.
• Primary Examiner(s): Follansbee, John
• Assistant Examiner(s): SIDDIQI, MOHAMMAD A
• Application Number:
  US09/782,172
• Publication Number:
  US 20020112004A1
• Time in Patent Office: 1,996 Days
• Field of Search: 709/203, 709/217, 709/223, 709231-233, 722/87
• US Class Current: 709/231
• CPC Class Codes: H04L 12/1822 Conducting the conference, e.g. admission, detection, selection or grouping of participants, correlating users to one or more conference sessions, prioritising transmission
• CPC Class Codes: H04L 12/1827 Network arrangements for conference optimisation or adaptation
• CPC Class Codes: H04L 12/1831 Tracking arrangements for later retrieval, e.g. recording contents, participants activities or behavior, network status
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/4046 with distributed floor control
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]

Abstract

A system for delivery of content over a wide area network, the content being captured by the system over a time period of a live event, the system comprising a first computer connected to a first side of the wide area network, the first computer having a cache for storing at least one data stream and the first computer having access to executable instruction code in an electronically readable medium. The executable instruction code is for at least: (1) identifying a live portion of the at least one data stream containing content captured by the system, the live portion being that portion of the at least one data stream at the first computer containing content captured more recently by the system than the content contained in any other portion of the at least one data stream at the first computer currently available for sending from the first computer to a second computer, the second computer being connected to a second side of the wide area network; (2) identifying a user position portion of the at least one data stream, the user position portion of the at least one data stream being that portion most recently sent from the first computer to the second computer; (3) receiving a first request at the first computer from the second computer; (4) in response to the first request, sending the live portion of the at least one data stream from the first computer to the second computer; (5) receiving a second request at the first computer from the second computer; and (6) in response to the second request, sending a portion of the at least one data stream from the first computer to the second computer containing content captured less recently by the system than content contained in the live portion of the at least one data stream. The first request and the second request may be sent from the second computer to the first computer and responded to by the first computer in alternating fashion during a time period that at least includes the time period of the live event as extended by a latency period of the wide area network.

Claims

1. A method of streaming a first data stream of a live event in a first and second streaming modes supported at a first computer connected to a first side of a wide area network from the first computer to a second computer connected to a second side of the wide area network, the second computer having a media player program for presenting content of the first data stream to a user at the second computer, a first mode of the media player program not changing in response to a change from the first of the streaming modes to the second of the streaming modes, the method comprising:

the first computer sending executable instruction code to the second computer for invoking the first mode of the media player program and for presenting an on-screen interface allowing a user at the second computer to request in successive fashion at least the first and the second of the plurality of streaming modes supported at the first computer;

in response to a request received at the first computer from a user at the second computer during the live event to change from the first of the plurality of streaming modes to the second of the plurality of streaming modes, associating time stamp values with data units of the first data stream such that the media player program at the second computer will present content of the first data stream in a manner providing the user at the second computer an experience of a mode change while the media player program remains in the first mode of the media player program, wherein the first mode of the media player program is a mode for playing content at a first content rate, the first mode of the streaming modes is a mode for playing content at the first content rate, and the second mode of the streaming modes is a mode for playing content at a second content rate, the second content rate being faster than the first content rate, and wherein when streaming in the second of the plurality of modes, time stamps of data units sent to the second computer are adjusted such that a time value difference between the time stamps of a first data unit and a second data unit is less than the time value difference between the time stamps originally applied to the first data unit and the second data unit so that the media player program, while remaining in a mode for playing content at the first content rate, plays content at the second content rate; and

wherein one of the streaming mode is a live streaming mode for presenting live content of the live event and the other one of the streaming mode is a non-live streaming mode for presenting content of the live event that is less recent than the live content, and wherein the first mode of the media player transitions from the non-live streaming mode to the live streaming mode when the time stamp value of the data units of the non-live streaming mode catches up to the time stamp values of the live streaming mode.

2. The system of claim 1 wherein the first data stream is a first sequence of audio samples.

3. The system of claim 1 wherein the first data stream includes a first sequence of video frames.

4. The system of claim 1 wherein the first data stream includes a first sequence of commands for directing the second computer to retrieve and present a sequence of slides.

5. The method of claim 1 wherein the first mode of the media player is a mode for playing in sequence data units having successively increasing time stamp values, the first mode of the streaming modes is the live streaming mode, the second mode of the streaming modes is the non-live streaming mode having a first identifiable difference between an originally applied time stamp of a data unit to be next delivered from the first computer to the second computer and a time stamp corresponding to real time wherein the time stamp value of the data unit to be next delivered is changed from the originally applied time stamp to the time stamp corresponding to real time such that the second computer continues to receive data units that have successively increasing time stamp values when a mode change from the first of the streaming modes to the second of the streaming modes occurs.

6. A system for streaming a first data stream of a live event in a first and second streaming modes supported at a first computer connected to a first side of a wide area network from the first computer to a second computer connected to a second side of the wide area network, the second computer having a media player program for presenting content of the first data stream to a user at the second computer, a first mode of the media player program not changing in response to a change from the first of the streaming modes to the second of the streaming modes, the system comprising:

the first computer configured to send executable instruction code to the second computer for invoking the first mode of the media player program and for presenting an on-screen interface allowing a user at the second computer to request in successive fashion at least the first and the second of the plurality of streaming modes supported at the first computer;

the second computer that is configured to send a request from a user to the first computer during the live event in response to which the first computer is to change from the first of the plurality of streaming modes to the second of the plurality of streaming modes, and is further configured to use time stamp values associated with data units of the first data stream such that the media player program at the second computer will present content of the first data stream in a manner providing the user at the second computer an experience of a mode change while the media player program remains in the first mode of the media player program, wherein the first mode of the media player program is a mode for playing content at a first content rate, the first mode of the streaming modes is a mode for playing content at the first content rate, and the second mode of the streaming modes is a mode for playing content at a second content rate, the second content rate being faster than the first content rate, and

wherein when streaming in the second of the plurality of modes, time stamps of data units sent to the second computer are adjusted such that a time value difference between the time stamps of a first data unit and a second data unit is less than the time value difference between the time stamps originally applied to the first data unit and the second data unit so that the media player program, while remaining in a mode for playing content at the first content rate, plays content at the second content rate; and

wherein one of the streaming mode is a live streaming mode for presenting live content of the live event and the other one of the streaming mode is a non-live streaming mode for presenting content of the live event that is less recent than the live content, and the first mode of the media player transitions from the non-live streaming mode to the live streaming mode when the time stamp value of the data units of the non-live streaming mode catches up to the time stamp values of the live streaming mode.

7. The method of claim 6 wherein the first data stream is a first sequence of audio samples.

8. The method of claim 6 wherein the first data stream includes a first sequence of video frames.

9. The method of claim 6 wherein the first data stream includes a first sequence of commands for directing the second computer to retrieve and present a sequence of slides.

10. The system of claim 6 wherein the first mode of the media player is a mode for playing in sequence data units having successively increasing time stamp values, the first mode of the streaming modes is the live streaming mode, the second mode of the streaming modes is the non-live streaming mode having a first identifiable difference between an originally applied time stamp of a data unit to be next delivered from the first computer to the second computer and a time stamp corresponding to real time wherein the time stamp value of the data unit to be next delivered is changed from the originally applied time stamp to the time stamp corresponding to real time such that the second computer continues to receive data units that have successively increasing time stamp values when a mode change from the first of the streaming modes to the second of the streaming modes occurs.