METHOD FOR TRANSMITTING STREAM BETWEEN ELECTRONIC DEVICES AND ELECTRONIC DEVICE FOR THE METHOD THEREOF

• US 20160294912A1
• Filed: 06/16/2016
• Published: 10/06/2016
• 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
• Granted Patent: US 9,954,923 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 method operable in a first electronic device, comprising:

determining whether an encoding format of an encoded video stream is a format decodable by a second electronic device; and

decoding and outputting a frame of the encoded video stream through an output device of the first electronic device, and transmitting the encoded video stream to the second electronic device,

wherein the transmitting the encoded video stream to the second electronic device is transmitting the encoded video stream without re-encoding it after delaying by a determined time from frame time information of the encoded video stream.

2. The method of claim 1, wherein the determined delay time is based at least in part on a determined decoding time of the video stream at the first electronic device.

3. The method of claim 1, wherein the determined delay time is based at least in part on a determined decoding time of the video stream at the first electronic device and a link delay in transmitting the encoded video stream to the second electronic device.

4. The method of claim 1, wherein the determined time delay is based at least in part on a determined decoding time of the video stream at the first electronic device, a link delay in transmitting the encoded video stream to the second electronic device, and a decoding time in decoding the encoded video stream at the second electronic device.

5. The method of claim 1, further comprising, before determining whether the encoding format is a decodable format:

receiving an encoding format of a video stream decodable by the second electronic device, from the second electronic device.

6. The method of claim 1, further comprising, before determining whether the encoding format is a decodable format:

sending from the first electronic device to the second electronic device a request inquiring about whether the encoding format of the encoded video stream is a decodable format of the second electronic device; and

receiving, at the first electronic device, a response of the request from the second electronic device.

7. The method of claim 2, wherein the determined decoding time is obtained based on frame time information of the encoded video stream obtained from a header of the encoded video stream stored after parsing an encoded A/V stream to obtain the encoded video stream and an encoded audio stream.

8. The method of claim 2, wherein the determined decoding time is obtained based on frame time information of the decoded video stream obtained by monitoring an output frame of the decoded video stream.

9. The method of claim 1, wherein the determined delay time is based at least in part on a time determined by comparing the frame time information of the encoded video stream, which is obtained from the header of the encoded video stream stored after parsing the encoded video stream, and frame time information of the decoded video stream, which is obtained by monitoring an output frame of the decoded and displayed video stream.

10. The method of claim 1, wherein the encoded video stream is transmitted to the second electronic device by packetizing the encoded video stream according to a transport stream standard.

11. The method of claim 1, wherein the encoded video stream is part of an encoded audio/video (A/V) stream, and the method further comprising:

determining whether an encoding format of an audio stream of the A/V stream is a format decodable by the second electronic device, if so, transmitting the encoded audio stream without re-encoding it to the second device.

12. The method of claim 1, further comprising:

decoding and outputting an encoded audio stream in the first electronic device, and re-encoding and transmitting the output audio stream to the second electronic device.

25. A computer-readable storage medium storing one or more programs comprising instructions which, when executed by an electronic device, cause the device to execute the method according to claim 1.

13. A first electronic device comprising:

one or more processors;

a memory; and

one or more modules stored to the memory to be executed by the one or more processors,

wherein the one or more modules stores instructions for determining whether an encoding format of an encoded video stream is a format decodable by a second electronic device and transmitting the encoded video stream to the second electronic device wherein the transmitting the encoded video stream to the second electronic device is transmitting the encoded video stream without re-encoding it after delaying by a determined time from frame time information of the encoded video stream.

14. The first electronic device of claim 13, wherein the determined delay time is based at least in part on a determined decoding time of the video stream at the first electronic device.

15. The first electronic device of claim 13, wherein the determined delay time is based at least in part on a determined decoding time of the video stream at the first electronic device and a link delay in transmitting the encoded video stream to the second electronic device.

16. The first electronic device of claim 13, wherein the determined time delay is based at least in part on a determined decoding time of the video stream at the first electronic device, a link delay in transmitting the encoded video stream to the second electronic device, and a decoding time in decoding the encoded video stream at the second electronic device.

17. The first electronic device of claim 13, wherein the one or more modules further stores

an instruction for discerning reception of an encoding format of a video stream decodable by the second electronic device, from the second electronic device.

18. The first electronic device of claim 13, wherein the one or more modules further stores instructions for sending to the second electronic device a request inquiring about whether the encoding format of the encoded video stream is a decodable format of the second electronic device, and for discerning reception of a response of the request from the second electronic device.

19. The first electronic device of claim 14, wherein the determined decoding time is based on frame time information of the encoded video stream obtained from a header of the encoded video stream stored after parsing the encoded video stream.

20. The first electronic device of claim 14, wherein the determined decoding time is based on frame time information of the decoded video stream obtained by monitoring an output frame of the decoded video stream.

21. The first electronic device of claim 13, wherein the determined delay time is based at least in part on a time determined by comparing the frame time information of the encoded video stream, which is obtained from the header of the encoded video stream stored after parsing the encoded video stream, and frame time information of the decoded video stream, which is obtained by monitoring an output frame of the decoded and displayed video stream.

22. The first electronic device of claim 13, wherein the one or more modules further stores an instruction for packetizing the encoded video stream according to a transport stream standard.

23. The first electronic device of claim 13, wherein the encoded video stream is part of an audio/video (A/V) stream, and the instructions further comprise instructions for:

determining whether an encoding format of an audio stream of the A/V stream is a format decodable by the second electronic device, if so, transmitting the encoded audio stream without re-encoding it to the second device.

24. The first electronic device of claim 13, comprising a touch screen including a display that displays the decoded video stream.