Device for transmitting and receiving video data and transmitting and receiving method

Abstract

The invention discloses a device for transmitting and receiving video data and a transmitting and receiving method; a confirmation retransmission module is arranged on a transmitting device of video data; a response module is arranged on a receiving device of video data; a packet-loss retransmission mechanism is established, namely, aiming at the received RTP data packet, the response module in the receiving device responds and restores confirmation information to the confirmation retransmission module in the transmitting device, the confirmation retransmission module is utilized for receiving the confirmation information, judging whether the RTP data packet loses and generating retransmission commands to a first UDP module after judging that the RTP data packet loses; the first UDP module retransmits the RTP data packet to a TCP / IP transmission network according to retransmission instructions and the receiving device receives the RTP data packet again so as to ensure the data packet received by the receiving device to be complete, thereby ensuring that finally, an image output image can output video image with good output quality and sound effect, namely, the image and the sound are clear.

Description

Technical field [0001] The present invention relates to the field of multimedia communication, in particular to a sending and receiving device and a sending and receiving method of video data. Background technique [0002] Currently, a video conference system includes a sending device and a receiving device. Such as figure 1 As shown, the sending device includes an image acquisition module 1, a video encoding module 2, a first RTP (Real Time Transport Protocol) module 3 and a first UDP (User Datagram Protocol) module 5; figure 2 As shown, the receiving device includes a second UDP module 6, a second RTP module 8, a QoS (Quality of Service) module 9, a decoding module 10, and an image output device 11. Among them, the image acquisition module 1 outputs the collected original video image to the video encoding module 2. The video encoding module 2 encodes the original video image and converts it into a video frame and outputs it to the first RTP module 3. The first RTP module Firs...

AI Technical Summary

Problems solved by technology

However, the packet loss problem has not been solved. The video frame is divided into at least one data packet for transmission on the network. Even if a data packet is lost, it will not be able to form a complete video frame, resulting in multiple data packets being invalid, especially the I frame (i.e. The first frame of image encoding, which is also the key frame of the image, is moderately compressed and used as a reference point for random access, which can be used as an image) The impact of packet loss is very large

For example, if Figure 4 As shown, it is a schematic diagram that the existing video communication system cannot control the packet loss phenomenon in the process of transmitting data packets in the TCP / IP transmission network, Figure 4 It shows that the data packet n-2 and data packet n sent by the sending device of the system are lost in the transmission in the TCP / IP network, so that the receiving device of the system does not receive the data packet n-2 and data packet n, because The data packet of a video frame is incomplete, which will cause the video image to be blurred and the sound to be unclear

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