Method for transmitting stream between electronic devices and electronic device for the method thereof

• US 9,954,923 B2
• Filed: 06/16/2016
• Issued: 04/24/2018
• Est. Priority Date: 02/24/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Heung-Ki, Kim, Gil-Yoon, Kim, Soung-Kwan, Kim, Jong-Kyu, Lim, Jong-Kyu
• Primary Examiner(s): Beck, Leron
• Application Number:
  US15/184,095
• Publication Number:
  US 20160294912A1
• Time in Patent Office: 677 Days
• Field of Search: 37524025
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/75 Media network packet handling
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/41265 having a remote control device for bidirectional communication between the remote control device and client device unidirectional remote control device H04N21/42204
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/4302 Content synchronisation processes, e.g. decoder synchronisation
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/440218 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 conversion of standards in analogue television systems H04N7/01
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10

Abstract

A technique for transmitting a video stream between a first electronic device and a second electronic device is provided. The first device receives an encoded video stream and determines whether an encoding format of the encoded video stream is a format decodable by a second electronic device. If the format is decodable, the encoded video stream is transmitted without a re-encoding operation to the second device. The video stream is displayed at the first device delayed by a determined delay time enabling the video stream to be displayed at the second device substantially synchronized with the display at the first device.

Claims

1. A source device comprising:

a wireless local area communication module;

a memory to store instructions and an encoded video content; and

a processor operably coupled with the wireless local area communication module and the memory, the processor configured to execute the instructions to;

establish a wireless fidelity display (WFD) connection between the source device and a sink device using the wireless local area communication module;

transmit, to the sink device, first information to query a video format supported by the sink device;

receive, from the sink device, second information comprising a list including at least one video format supported by the sink device in response to the first information;

determine, based at least in part on the second information, whether at least one portion of the encoded video content is decodable by the sink device using the at least one video format;

transmit, based on determining that the at least one portion of the encoded video content is decodable by using the at least one video format in the sink device, the at least one portion of the encoded video content to the sink device via the WFD connection; and

based on determining that the at least one portion of the encoded video content is not decodable by using the at least one video format in the sink device, decode the at least one portion of the encoded video content and encode the decoded at least one portion using the at least one video format to generate a re-encoded video content, and transmit the re-encoded video content to the sink device via the WFD connection,

wherein the at least one portion of the encoded video content that is transmitted from the source device to the sink device is decoded by using the at least one video format in the sink device, and is presented via a display of the sink device,

wherein the re-encoded video content that is transmitted from the source device to the sink device is decoded by using the at least one video format in the sink device, and is presented via the display of the sink device.

2. The source device of claim 1, wherein the first information is transmitted in a capability negotiation process, and wherein the second information is received in the capability negotiation process.

3. The source device of claim 1, wherein the first information comprises information to query a playback state of the encoded video content, wherein the second information further comprises information regarding a current playback state of the encoded video content in the sink device, and wherein the information regarding the current playback state is configured with a presentation timestamp (PTS).

4. The source device of claim 1, wherein the second information further comprises a list including at least one audio format supported by the sink device, and wherein the at least one processor is further configured to execute the instructions to transmit, to the sink device, a re-encoded audio content by using the at least one audio format.

5. The source device of claim 1, wherein the transmitted at least one portion of the encoded video content is decoded by using the at least one video format and is presented via the display of the sink device.

6. The source device of claim 1, wherein the transmitted re-encoded video content is decoded by using the at least one video format and is presented via the display of the sink device.

7. The source device of claim 1, further comprising:

a display operably coupled to the processor, wherein the processor is further configured to execute the instructions to;

decode the encoded video content to generate a decoded video content; and

present the decoded video content via the display as synchronized with the at least one portion of the encoded video content which is decoded in the sink device and presented via the display of the sink device.

8. The source device of claim 1, wherein the processor is further configured to execute the instructions to:

transmit, to another sink device distinct from the sink device, a re-encoded audio content, wherein the transmitted at least one portion of the encoded video content is presented via the display of the sink device, and wherein the transmitted re-encoded audio content is outputted via a speaker of the another sink device.

9. A sink device comprising:

a wireless local area communication module;

a memory to store instructions;

a display; and

a processor, operably coupled with the wireless local area communication module and the memory, configured to;

establish a wireless fidelity display (WFD) connection between a source device and the sink device using the wireless local area communication module;

receive, from the source device, first information to query a video format supported by the sink device;

transmit, to the source device, second information comprising a list including at least one video format supported by the sink device in response to the first information;

receive, from the source device, at least one portion of encoded video content stored in the source device or a re-encoded video content which is decodable by the at least one video format, wherein the at least one portion of the encoded video content is received in response to determining, by the source device, that the at least one portion of the encoded video content is decodable by using the at least one video format in the sink device, wherein the re-encoded video content is received in response to determining, by the source device, that the at least one portion of the encoded video content is not decodable by using the at least one video format in the sink device;

if receiving the at least one portion of the encoded video content, decode the at least one portion of the encoded video content by using the at least one video format and present the decoded at least one portion of the encoded video content via the display; and

if receiving the re-encoded video content, decode the re-encoded video content by using the at least one video format and present the re-encoded video content which is decoded via the display.

10. The sink device of claim 9, wherein the first information is received in a capability negotiation process, and wherein the second information is transmitted in the capability negotiation process.

11. The sink device of claim 9, wherein the first information comprises information to query a playback state of the encoded video content, and wherein the second information further comprises information regarding a current playback state of the encoded video content in the sink device, and wherein the information regarding the current playback state is configured with a presentation timestamp (PTS).

12. The sink device of claim 9, further comprising:

a speaker, wherein the second information further comprises a list including at least one audio format supported by the sink device, and wherein the processor is further configured to execute the instructions to;

receive, from the source device, a re-encoded audio content by using the at least one audio format;

generate an output signal by decoding the re-encoded audio content; and

output, via the speaker, the output signal.

13. The sink device of claim 9, wherein the processor is configured to execute the stored instructions to:

present, via the display, the decoded at least one portion of the encoded video content as synchronized with the at least one portion of the encoded video content which is decoded in the source device and is presented via a display of the source device.

14. The sink device of claim 9, wherein a re-encoded audio content is transmitted from the source device to another sink device distinct from the sink device, and wherein the transmitted re-encoded audio content is outputted via a speaker of the another sink device.