System and method for advancing to a predefined portion of a decompressed media stream

Patent metadata

Field	Value
Publication number	US-9516082-B2
Application number	US-201314133358-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Aug 1, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A computer system generates a first decompressed media stream based on a first compressed media stream. While providing the first decompressed media stream to a presentation device, the computer system receives a content-transition indication for providing a second decompressed media stream to the presentation device instead of the first decompressed media stream. The content-transition indication corresponds to a request to display the second decompressed media stream starting at a respective point within a predefined portion of the second decompressed media stream. The computer system receives a second compressed media stream corresponding to the second decompressed media stream. In response to receiving the content-transition indication, the computer system generates the predefined portion of the second decompressed media stream and provides a subset of the predefined portion, that does not include content prior to the respective point, to the presentation device instead of the first decompressed media stream.

First claim

What is claimed is:

1. A method comprising:
at a computer system including one or more processors and memory:
generating, using a first codec, a first decompressed media stream based on a first compressed media stream;
providing the first decompressed media stream to a presentation device;
while providing the first decompressed media stream to the presentation device:
receiving a content-transition indication indicating that a second decompressed media stream is to be provided to the presentation device instead of the first decompressed media stream, wherein the content-transition indication corresponds to a request to display the second decompressed media stream starting at a respective point in the second decompressed media stream; and
receiving a second compressed media stream corresponding to the second decompressed media stream; and

in response to receiving the content-transition indication:
initializing a second codec after the first codec has stopped decompressing compressed media so that no more than one codec is decompressing compressed media at a time;
generating, using the second codec, the second decompressed media stream; and
providing the second decompressed media stream, without content prior to the respective point, to the presentation device instead of providing the first decompressed media stream to the presentation device.

2. The method of claim 1 , wherein generating, using the first codec, the first decompressed media stream based on the first compressed media stream includes:
receiving the first compressed media stream;
decrypting the first compressed media stream;
demultiplexing the first compressed media stream;
storing decrypted and demultiplexed first compressed media stream data in a first compressed buffer; and
decompressing the first compressed media stream data using the first codec to generate the first decompressed media stream.

3. The method of claim 1 , further including:
prior to receiving the content-transition indication, storing a first amount of decompressed media stream data; and
after receiving the content-transition indication, storing a second amount of decompressed media stream data that is larger than the first amount of decompressed media stream data.

4. The method of claim 1 , wherein receiving the content-transition indication includes detecting user input selecting a media content affordance associated with requesting presentation of the second decompressed media stream.

5. The method of claim 1 , wherein:
receiving the content-transition indication includes detecting a decrease in the bandwidth available for receiving media streams at the computer system;
the method includes transmitting, to a media source, a respective request for a lower bandwidth version of content corresponding to the first decompressed media stream; and
the second compressed media stream is received in response to the respective request.

6. The method of claim 1 , wherein:
receiving the content-transition indication includes detecting an increase in the bandwidth available for receiving media streams at the computer system;
the method includes transmitting, to a media source, a respective request for a higher bandwidth version of content corresponding to the first decompressed media stream; and
the second compressed media stream is received in response to the respective request.

7. The method of claim 1 , further including, after generating at least a portion of the second decompressed media stream, cross fading first content from the first decompressed media stream with second content from the second decompressed media stream.

8. The method of claim 1 , wherein the first compressed media stream corresponds to source content and the second compressed media stream corresponds to the same source content.

9. The method of claim 1 , wherein the first compressed media stream and the second compressed media stream correspond to different source content.

10. The method of claim 1 , wherein:
the method further includes, in response to receiving the content-transition indication:
selecting a first transition point in first content corresponding to the first compressed media stream;
selecting a second transition point in second content corresponding to the second compressed media stream, wherein the respective point is the second transition point; and

providing the second decompressed media stream to the presentation device instead of providing the first decompressed media stream to the presentation device includes ceasing to provide the first content at the first transition point and starting to provide the second content at the second transition point.

11. The method of claim 10 , wherein:
the second transition point is selected in accordance with a bandwidth available for receiving the second compressed media stream; and
the first transition point is selected based on the second transition point.

12. The method of claim 11 , further including:
determining a respective quantity of data corresponding to the second compressed media stream for downloading as buffered media based on:
a target play time of the buffered media; and
a bit rate of the second compressed media stream;

determining a predicted buffering time that it will take to buffer the second compressed media stream based on:
the respective quantity of data; and
the bandwidth available for receiving the second compressed media stream;

identifying a plurality of candidate transition points in the second compressed media stream; and
selecting the second transition point from the plurality of candidate transition points based on the predicted buffering time that it will take to buffer the second compressed media stream.

13. The method of claim 10 , wherein:
the method further includes, after selecting the second transition point, requesting the second compressed media stream starting at the second transition point; and
receiving the second compressed media stream corresponding to the second decompressed media stream includes receiving the second compressed media stream starting at the second transition point.

14. The method of claim 10 , further including:
prior to receiving the content-transition indication, receiving the first compressed media stream; and
after selecting the first transition point, terminating receipt of the first compressed media stream after receiving data corresponding to the first transition point.

15. The method of claim 10 , wherein:
the first content includes video content that is divided into a first plurality of groups of frames;
the second content includes video content that is divided into a second plurality of groups of frames;
the first transition point in the first content is selected so as to occur at a boundary of a first group of frames in the first plurality of groups of frames; and
the second transition point in the second content is selected so as to occur at a boundary of a second group of frames in the second plurality of groups of frames.

16. The method of claim 15 , wherein:
the first transition point corresponds to an end of a scene in the first decompressed media stream; and
the second transition point corresponds to a beginning of a scene in the second decompressed media stream.

17. A computer system, the computer system comprising:
one or more processors; and
memory storing one or more programs, wherein the one or more programs are stored in the memory for execution by the one or more processors, the one or more programs including instructions for:
generating, using a first cod

Assignees

• Spotify Ab

Inventors

• Hoffert Eric
• Strigeus Ludvig
• Oman Andreas
• Arvidsson Oskar

Classifications

• H04L65/604

  Electricity · mapped topic

• H04N21/4384

  involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency · CPC title

• H04L65/4084

  Electricity · mapped topic

• H04N21/44008

  involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream (arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59) · CPC title

• H04L65/607

  Electricity · mapped topic