ENCODING AND DECODING TECHNIQUES FOR REMOTE SCREEN SHARING OF MEDIA CONTENT USING VIDEO SOURCE AND DISPLAY PARAMETERS

• US 20150201193A1
• Filed: 01/10/2012
• Published: 07/16/2015
• Est. Priority Date: 01/10/2012
• Status: Abandoned Application

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Gu, Qunshan, Jia, Wei
• Application Number:
  US13/347,676
• Publication Number:
  US 20150201193A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04N 19/115 Selection of the code volume for a coding unit prior to coding
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/156 Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/179 the unit being a scene or a shot

Abstract

Techniques for efficient coding of video content in relation to screen sharing are presented. A coder management component can detect native resolution and frame rate for video content from a video source and an original display resolution and frame rate associated with a local display window. The coder management component can identify the smaller resolution and smaller frame rate, and encode the video content using the smaller resolution and smaller frame rate for transmission to a remote device for display, e.g., in screen sharing. The coder management component can detect the display window size of the local display window and transmit the size to a remote device. At the remote device, a decoder can decode the video bitstream and reconstruct the video content in accordance with the smaller resolution, and can render and display the reconstructed video content in accordance with the display window size.

Claims

1. A system to facilitate screen sharing video content, the system comprising:

at least one memory that stores computer executable components; and

at least one processor that executes the following computer executable components stored in the at least one memory;

a coder component configured to;

receive captured video content associated with a video source, and

encode the captured video content to generate an encoded video bitstream for transmission to a remote device; and

a coder management component configured to;

receive a plurality of parameters associated with a display of the remote device,

determine a video display resolution, from the plurality of parameters, associated with a display window that displays the video content on the display of the remote device,

determine a video source resolution associated with the video source from a plurality of video source parameters,

control scaling of the captured video content using the smaller of the video source resolution and the video display resolution, and

control encoding of the scaled captured video content by the coder.

2. The system of claim 1, wherein the plurality of parameters associated with the display of the remote device includes at least one of the video display resolution or video display frame rate.

3. The system of claim 1, wherein the plurality of video source parameters includes at least one of the video source resolution or a video source frame rate.

6. The system of claim 1, wherein the coder management component is further configured to:

determine a video display frame rate, from the plurality of parameters, associated with the display window that displays the video content on the display of the remote device;

determine a video source frame rate associated with the video source from the plurality of video source parameters; and

encode the video bitstream based on the smaller of the video display frame rate and the video source frame rate.

7. The system of claim 1, wherein, when the display window that displays the video content on the display of the remote device is generated through decoding, by a decoder component associated with a video bitstream from the video source, the coder management component detects the video source resolution associated with the video source from one of the video bitstream or the decoder component.

8. The system of claim 1, wherein

the coder management component detects the video source resolution, based on a capture buffer when the local display window is generated by a capture device, wherein the capture buffer is indicative of the video source resolution;

and

the coder management component detects the video source frame rate based on a buffer update rate associated with the capture buffer.

9. The system of claim 1, wherein the coder management component detects a display window size associated with the local display window, and transmits information relating to the display window size before or simultaneously with transmission of the encoded video bitstream.

10. The system of claim 9, wherein the coder management component detects a display window location associated with the local display window, and transmits information relating to the display window location before or simultaneously with transmission of the encoded video bitstream.

11. The system of claim 9, wherein the coder management component transmits the information relating to the display window size via a first communication channel that is also being used to transmit the encoded video bitstream.

12. The system of claim 9, wherein the coder management component combines the information relating to the display window size with the encoded video bitstream to generate a single encoded video bitstream, and transmit the single encoded video bitstream to the remote device associated with the display component.

13. The system of claim 9, wherein the coder management component transmits the encoded video bitstream via a first communication channel and transmits the information relating to the display window size via a second communication channel.

4-5. -5. (canceled)

14. A method to facilitate screen sharing of video content, the method comprising:

employing at least one processor to facilitate execution of code instructions retained in at least one memory device, the at least one processor, in response to execution of the code instructions, perform acts comprising;

receive captured video content associated with a video source;

determine a video source resolution associated with a video source that provides the captured video content;

determine a video display resolution associated with a display window that displays the video content on a display of a remote device;

scale the captured video content using the smaller of the video source resolution and the video display resolution; and

control encoding of the scaled captured video content to generate an encoded video bitstream for transmission to the remote device.

15. The method of claim 14, further comprising:

determining a video source frame rate associated with the video source; and

determining display frame rate associated with the display window.

16. The method of claim 15, further comprising:

encoding the video content based on the smaller of the video source frame rate and the display frame rate.

17. The method of claim 16, further comprising:

detecting a display window size associated with the display window in relation to displaying the video content; and

transmitting information relating to the display window size before or concurrently with transmission of the encoded video bitstream.

18. The method of claim 17, further comprising:

detecting a display window location associated with the display window in relation to displaying the video content; and

transmitting information relating to the display window location before or concurrently with transmission of the encoded video bitstream.

19. The method of claim 18, further comprising:

transmitting the information relating to the display window location and the display window size via a first communication channel being used to transmit the encoded video bitstream.

20. The method of claim 18, further comprising:

transmitting the encoded video bitstream via a first communication channel; and

transmitting the information relating to the display window location and the display window size via a second communication channel.

21. A system, comprising:

means for receiving captured video content associated with a video source;

means for determining a video source resolution associated with a video source that provides video content; and

means for determining a video display resolution associated with a display window that displays the video content on a display of a remote device;

means for scaling the captured video content using the smaller of the video source resolution and the video display resolution; and

means for managing encoding of the scaled captured video content to generate an encoded video bitstream to facilitate screen sharing of the video content on a display associated with the remote device.

22. A method to facilitate screen sharing of video content on a remote device, the method comprising:

employing at least one processor to facilitate execution of code instructions retained in at least one memory device, the at least one processor, in response to execution of the code instructions, perform acts comprising;

decoding an encoded video bitstream, including information associated with the video content, to facilitate reconstructing the video content, including a sequence of video images that are carried in the encoded video bitstream;

identifying information relating to resolution and frame rate of the video images associated with the encoded video bitstream, wherein the resolution of the video images is the smaller of a video source resolution and a video display resolution, and wherein the frame rate is the smaller of a video source frame rate and a video display frame rate associated with a display window that displays the video content on a display of the remote device;

identifying information relating to display window location and display window size associated with the encoded video bitstream;

rendering reconstructed video content based on the resolution and the frame rate of the video images; and

presenting the reconstructed video content on a display associated with the remote device in accordance with the display window size and the display window location.