Real-time or near real-time streaming

• US 8,560,642 B2
• Filed: 04/01/2011
• Issued: 10/15/2013
• Est. Priority Date: 04/01/2010
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Pantos, Roger, May, William Jr., Biderman, David
• Primary Examiner(s): Dalencourt, Yves
• Application Number:
  US13/078,862
• Publication Number:
  US 20110246623A1
• Time in Patent Office: 928 Days
• Field of Search: 709/219
• US Class Current: 709/219
• CPC Class Codes: H04L 65/1083 In-session procedures
• CPC Class Codes: H04L 65/4015 where at least one of the additional parallel sessions is real time or time sensitive, e.g. white board sharing, collaboration or spawning of a subconference
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/756 adapting media to device capabilities
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]

Abstract

Methods and apparatuses provide real-time or near real-time streaming of content, specified in one or more playlists, using transfer protocols such as on HTTP compliant protocol. In one embodiment, a method can execute a user application on a client device to present media files and to control presentation of the media files. The method can further run a media serving process on the client device to retrieve a playlist specifying the media files and a media source at which the media files arc available, to retrieve the media files from the media source, and to decode the media files retrieved. While the media serving process is separate from the user application, they may share the same privileges with respect to memory control, memory space, memory allocation, file system control, and network control.

Claims

1. A machine readable non-transitory storage medium storing executable instructions that when executed by a data processing system cause the system to perform a method comprising:

creating timestamped tags, each of which is associated with a media file and includes a timestamp which indicates a date and time of the associated media file;

creating a playlist file, the playlist file including one or more of the timestamped tags and one or more URLs, wherein each URL is associated with a timestamped tag and specifies a particular media file associated with the timestamped tag; and

distributing the playlist file to a client device so that the playlist file is available for searching at the client device by date and time using timestamps in the one or more of the timestamped tags, wherein the searching is in response to an input specifying the date and time.

2. The medium as in claim 1, wherein the particular media file includes one or more internal timestamps.

3. The medium as in claim 2, wherein the distributing of the playlist file occurs in response to a request for the playlist file from the client device, and wherein the input causes a search through a request of the date and time, and wherein the method further comprises:

receiving a request for the particular media file which is identified as a result of the searching within the playlist file, and the method further comprises transmitting the particular media file.

4. The medium as in claim 3 wherein each of the timestamped tags comprise an absolute time and date and wherein each timestamped tag appears after a corresponding discontinuity tag in the playlist file, the discontinuity tag indicating an encoding discontinuity between a plurality of media files.

5. The medium as in claim 4 wherein the content of the particular media file is a portion of a recording of a live event which occurred at the date and time specified in the input.

6. A machine implemented method comprising:

creating timestamped tags, each of which is associated with a media file and includes a timestamp which indicates a date and time of the associated media file;

creating a playlist file, the playlist file including one or more of the timestamped tags and one or more URLs, wherein each URL is associated with a timestamped tag and specifies a particular media file associated with the timestamped tag; and

distributing the playlist file to a client device so that the playlist file is available for searching at the client device by date and time using timestamps in the one or more of the timestamped tags, wherein the searching is in response to an input specifying the date and time.

7. The method as in claim 6, wherein the particular media file includes one or more internal timestamps.

8. The method as in claim 7, wherein the distributing of the playlist file occurs in response to a request for the playlist file from the client device, and wherein the input causes a search through a request of the date and time, and wherein the method further comprises:

receiving a request for the particular media file which is identified as a result of the searching within the playlist file, and the method further comprises transmitting the particular media file.

9. The method as in claim 8 wherein the timestamped tag comprises an absolute time and date and wherein each timestamped tag appears after a corresponding discontinuity tag in the playlist file.

10. The method as in claim 9 wherein the content of the particular media file is a portion of a recording of a live event which occurred at the date and time specified in the input.

11. A machine readable non-transitory storage medium storing executable instructions that when executed by a data processing system, cause the system to perform a method comprising:

receiving, at a client device, a playlist file having a plurality of URLs and a plurality of timestamped tags, wherein each URL specifies a media file and is associated with a timestamped tag which indicates a time of the media file in a playback of a presentation provided by the media file;

receiving an input which specifies a desired time for playback;

searching, at the client device in response to the input, the plurality of timestamped tags in the playlist file to find a target timestamped tag which indicates a time of a target media file that is close to the desired time; and

transmitting a request for the target media file using a URL associated with the target timestamped tag.

12. The medium as in claim 11 wherein each media file includes one or more internal timestamps and wherein each of the timestamps comprises an absolute time and date.

13. The medium as in claim 12 wherein each timestamped tag appears after a corresponding discontinuity tag in the playlist file, the discontinuity tag indicating an encoding discontinuity between the associated media file and a media file preceding the associated media file, and wherein the content of the associated and the preceding media files specified in the playlist file is a portion of a recording of a live event which occurred at the date and time specified in the input of the desired time.

14. A machine implemented method executed by a data processing system, the method comprising:

receiving, at a client device, a playlist file having a plurality of URLs and a plurality of timestamped tags, wherein each URL specifies a media file and is associated with a timestamped tag which indicates a time of the media file in a playback of a presentation provided by the media file;

receiving an input which specifies a desired time for playback;

searching, at the client device in response to the input, the plurality of timestamped tags in the playlist file to find a target timestamped tag which indicates a time of a target media file that is close to the desired time; and

transmitting a request for the target media file using a URL associated with the target timestamped tag.

15. The method as in claim 14 wherein each media file includes one or more internal timestamps and wherein each of the timestamps comprises an absolute time and date.

16. The method as in claim 15 wherein each timestamped tag appears after a corresponding discontinuity tag in the playlist file, the discontinuity tag indicating an encoding discontinuity between the associated media file and a media file preceding the associated media file, and wherein the content of the associated and the preceding media files specified in the playlist file is a portion of a recording of a live event which occurred at the date and time specified in the input of the desired time.

17. A data processing system comprising:

means for receiving, at a client device, a playlist file having a plurality of URLs and a plurality of timestamped tags, wherein each URL specifies a media file and is associated with a timestamped tag which indicates a time of the media file in a playback of a presentation provided by the media file;

means for receiving an input which specifies a desired time for playback;

means for searching, at the client device in response to the input, the plurality of timestamped tags in the playlist file to find a target timestamped tag which indicates a time of a target media file that is close to the desired time; and

means for transmitting a request for the target media file using a URL associated with the target timestamped tag.

18. The system as in claim 17 wherein each media file includes one or more internal timestamps and wherein each of the timestamps comprises an absolute time and date.

19. The system as in claim 18 wherein each timestamped tag appears after a corresponding discontinuity tag in the playlist file, the discontinuity tag indicating an encoding discontinuity between the associated media file and a media file preceding the associated media file, and wherein the content of the associated and the preceding media files specified in the playlist file is a portion of a recording of a live event which occurred at the date and time specified in the input of the desired time.