Media device with intelligent cache utilization

• US 8,688,928 B2
• Filed: 07/20/2012
• Issued: 04/01/2014
• Est. Priority Date: 01/03/2006
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Hodge, Andrew Bert, Tupman, David John, Bar-Nahum, Guy
• Primary Examiner(s): Elmore, Reba I
• Application Number:
  US13/554,950
• Publication Number:
  US 20120290792A1
• Time in Patent Office: 620 Days
• Field of Search: 711/154, 711/163, 711/113
• US Class Current: 711/154
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3275 Power saving in memory, e.g. RAM, cache
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache
• CPC Class Codes: G06F 2003/0697 device management, e.g. handlers, drivers, I/O schedulers
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0625 Power saving in storage systems
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0674 Disk device
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 2020/00057 MPEG-1 or MPEG-2 audio layer III [MP3]
• CPC Class Codes: G11B 2020/10685 input interface, i.e. the way data enter the buffer, e.g. by informing the sender that the buffer is busy
• CPC Class Codes: G11B 2020/10759 content data
• CPC Class Codes: G11B 2020/10916 Seeking data on the record carrier for preparing an access to a specific address
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A portable media device and a method for operating a portable media device are disclosed. According to one aspect, a battery-powered portable media device can manage use of a mass storage device to efficiently utilize battery power. By providing a cache memory and loading the cache memory so as to provide skip support, battery power for the portable media device can be conserved (i.e., efficiently consumed). According to another aspect, a portable media device can operate efficiently in a seek mode. The seek mode is an operational mode of the portable media device in which the portable media device automatically scans through media items to assist a user in selecting a desired one of the media items.

Claims

1. A method in a media device including a processor and a cache memory for controlling a loading of the cache memory, the method comprising

generating in the processor an interface for receiving a user selection indicating a degree of skip support;

receiving in the processor a selection of the degree of skip support wherein the selection affects cache memory utilization of the media device associated with processing of skip operations;

based upon the selection of the degree of skip support, determining in the processor a number of media item snippets related to different media items that are to be maintained in the cache memory at one time wherein each of the number of media item snippets includes only a portion of media data for a respective media item such that outputting the media item in its entirety requires additional media data not included in the media item snippet to be loaded into the cache memory;

loading by the processor to a portion of the cache memory a first plurality of media item snippets in accordance with the determined number of media items to be maintained;

as different media items are selected for output or skipped over, managing by the processor different media item snippets within the cache memory to maintain the determined number of media item snippets in the cache memory.

2. The method as recited in claim 1 wherein the first plurality of media of item snippets is loaded from a mass storage device, separate from the cache memory, coupled to the media device.

3. The method as recited in claim 1 wherein the media data associated with the media items is only output from the media device after being loaded into the cache memory.

4. The method as recited in claim 1 wherein the media item snippets are portions of audio tracks.

5. The method as recited in claim 1, further comprising receiving a first selection of the degree of skip support and loading the cache memory with a first number of complete media items and a second number of media item snippets such that the first number of complete media items and the second number of media item snippets are simultaneously loaded into the cache memory.

6. The method as recited in claim 5, further comprising receiving a second selection of the degree of skip support and loading the cache memory with a third number of complete media items and a fourth number of media item snippets such that the third number of complete media items and the fourth number of media item snippets are simultaneously loaded into the cache memory.

7. The method as recited in claim 6, wherein the third number is less than the first number and the fourth number is greater than the second number.

8. The method as recited in claim 6, wherein the third number is greater than the first number and the fourth number is less than the second number.

9. The method as recited in claim 1 further comprising receiving the selection of the degree of skip support and determining the number of media item snippets that are to be maintained in the cache memory is zero.

10. The method as recited in claim 9, further comprising simultaneously loading a number of complete media items to the cache memory.

11. The method as recited in claim 1, wherein the use of media item snippets reduces a power consumption of the media device as compared to when media item snippets are not used.

12. The method as recited in claim 1, wherein media device includes the cache memory and a mass storage device each configured to store media data and wherein accessing the cache memory requires less power than accessing the mass storage device.

13. The method as recited in claim 1, further comprising receiving a selection that affects a length of the media item snippets stored to the cache memory wherein when the length of a media item snippet is longer more of the media item can be output before additional media data associated with the media item has to be loaded to the cache memory as compared to when the media item snippet is shorter.

14. The method of as recited in claim 13, wherein the number of media item snippets that are to be maintained in the cache memory at one time is increased when the selected length of the media item snippets is decreased.

15. The method as recited in claim 1, further comprising:

initiating output of a particular media item snippet loaded into the cache memory and receiving a skip selection for the particular media item snippet prior to reaching an end of the particular media item snippet such that a remaining portion of the particular media item snippet is not output.

16. The method as recited in claim 1, further comprising:

outputting a particular media item snippet in its entirety from the cache memory, loading an additional portion of the media item associated with the particular media item snippet to the cache memory, outputting the additional portion of the media item and receiving a skip selection such that a remaining portion of the particular media item is not output.

17. The method as recited in claim 1, further comprising:

receiving a selection of a seek mode wherein in the seek mode only the media data contained within the media item snippets loaded into the cache memory is output.

18. The method as recited in claim 17, in the seek mode, receiving an input while a particular media item snippet is being output and in response to the input, outputting a remaining portion of the particular media item associated within the media item snippet.

19. Non-transitory computer readable medium for storing computer code executable by a processor in an electronic media device that includes a cache memory comprising:

computer program code for generating an interface for receiving a user selection indicating a degree of skip support;

computer program code for receiving a selection of the degree of skip support wherein the selection affects cache memory utilization of the media device associated with processing of skip operations;

computer program code for, based upon the selection of the degree of skip support, determining a number of media item snippets related to different media items that are to be maintained in the cache memory at one time wherein each of the number of media item snippets includes only a portion of media data for a respective media item such that outputting the media item in its entirety requires additional media data not included in the media item snippet to be loaded into the cache memory;

computer program code for loading to a portion of the cache memory a first plurality of media item snippets in accordance with the determined number of media items to be maintained;

computer program code for, as different media items are selected for output or skipped over, manage different media item snippets within the cache memory to maintain the determined number of media item snippets in the cache memory.

20. The computer readable medium of claim 19, further comprising computer code for receiving a first selection of the degree of skip support and loading the cache memory with a first number of complete media items and a second number of media item snippets such that the first number of complete media items and the second number of media item snippets are simultaneously loaded into the cache memory.

21. The computer readable medium of claim 20, further comprising computer code for receiving a second selection of the degree of skip support and loading the cache memory with a third number of complete media items and a fourth number of media item snippets such that the third number of complete media items and the fourth number of media item snippets are simultaneously loaded into the cache memory wherein for the second selection of the degree of skip support a ratio of the fourth number to the third number that is maintained is different from a ratio of the second number to the first number.

22. The computer readable medium of claim 19, further comprising computer code for receiving a selection of a seek mode wherein in the seek mode only the media data contained within the media item snippets loaded into the cache memory is output.

23. A portable media device comprising:

a processor coupled to a cache memory and a battery,

the processor configured to;

generate an interface for receiving a user selection indicating a degree of skip support;

receive a selection of the degree of skip support wherein an amount of power used from the battery is increased or decreased depending upon the selection;

based upon the selection of the degree of skip support, determine a number of media item snippets related to different media items that are to be maintained in the cache memory at one time wherein each of the number of media item snippets includes only a portion of media data for a respective media item such that outputting the media item in its entirety requires additional media data not included in the media item snippet to be loaded into the cache memory;

load to a portion of the cache memory a first plurality of media item snippets in accordance with the determined number of media items to be maintained;

as different media items are selected for output or skipped over, manage different media item snippets within the cache memory to maintain the determined number of media item snippets in the cache memory.

24. The portable media device of claim 23, further comprising a mass storage device, separate from the cache memory, wherein the first plurality of media of item snippets is loaded from the mass storage device to the cache memory.

25. The portable media device of claim 23, wherein the processor is further configured to receive a first selection of the degree of skip support and load the cache memory with a first number of complete media items and a second number of media item snippets such that the first number of complete media items and the second number of media item snippets are simultaneously loaded into the cache memory.

26. The portable media device of claim of claim 25, wherein the processor is further configured to receive a second selection of the degree of skip support different from the first degree of skip support and load the cache memory with a third number of complete media items and a fourth number of media item snippets such that the third number of complete media items and the fourth number of media item snippets are simultaneously loaded into the cache memory wherein for the second selection of the degree of skip support a ratio of the fourth number to the third number that is maintained is different from a ratio of the second number to the first number.

27. Non-transitory computer readable medium for storing computer code executable by a processor in an autonomous media device that includes a cache memory and a storage device for storage of at least a media data file corresponding to a media item, comprising:

computer program code for receiving an indication of a degree of skip support;

computer code for reserving a portion of the cache memory for storage of a number of media item snippets, wherein the number of media item snippets is directly related to the degree of skip support, and wherein each media item snippet includes only a portion of the media data itself for a respective media item;

computer program code for storing the number of media item snippets only in the reserved portion of the cache memory;

computer program code for playing the selected media item snippet from the cache memory in accordance with a media item selection by an end-user;

computer program code for skipping to another media item snippet when a skip request is received;

computer program code for downloading a remaining portion of the media data file corresponding to the played snippet from the storage device when the skip request is not received; and

computer program code for playing the remaining portion of the media data file.