Method for optimising the transmission of video data streams in a wireless network

A device for enhancing the reliability and the quality of reception of video data streams over a wireless network governed by WiFi-type communication protocols, the device comprising:

• a network interface configured to receive, via the wireless network, a video data stream coded in a plurality of data packets G each comprising K first data blocks and N redundancy blocks for forward error correction (FEC), the video data stream comprising a succession of packets G each comprising K+N blocks being transmitted by at least one transmitting device multicasting the video data stream to the device;
• a hardware processor configured to process each of the data packets G received from the transmitting device, wherein the hardware processor is configured to, for each data packet:
• responsive to determining a correct reception of the K first data blocks, decode and view the video stream using the K first data blocks;
• responsive to determining an absence of reception of all of the K first data blocks, and that a total number of K+N blocks received is at least equal to K, decode, using a forward error correction algorithm (FEC), to retrieve the missing data of the blocks K, and decode and view the video stream in case of a positive result;
• responsive to determining that if the total number of K+N blocks received is less than K or in the absence of a positive result to the decoding via the forward error correction algorithm (FEC), send, to the transmitting device, a unicast message giving information at least concerning the missing data of the blocks K;
• and
• if a statistical algorithm of the transmitting device organizes the returning of the missing data, check the correct reception of the missing data returned by the transmitting device, and decode and view the video stream in case of a positive result;
• in the absence of correct reception of the missing data returned by the transmitting device or in the absence of returned data, check the reception of a reference image with internal coding in the received data packet G, then if such a reference image is received complete:
• i) apply an error concealment algorithm to the reference image with internal coding, and
• ii) decode and view the video stream using the application of the error concealment algorithm on the reference image to visually attenuate reception errors in the video data stream;
• in case of non-reception of a reference image with internal coding in the data packet G received:
• i) check the reception of at least one reference image of a preceding data packet G−1 and a subsequent data packet G+1,
• ii) execute an interpolation method on the uncompressed or linear data to reconstruct a damaged image, then
• iii) decode and view the video stream using the reconstructed image.

A non-transitory computer readable medium comprising computer executable instructions for enhancing the reliability and the quality of reception of video data streams over a wireless network governed by WiFi-type communication protocols, including instructions for:

• receiving, by a client device, a video data stream coded in a plurality of data packets G each comprising K first data blocks and N redundancy blocks for forward error correction (FEC), said video data stream comprising a succession of packets G each comprising K+N blocks being transmitted by at least one transmitting device multicasting the video data stream to the client device;
• processing each of the data packets G received from the transmitting device, wherein processing each data packet comprises:
• responsive to determining a correct reception of the K first data blocks, decoding and viewing the video stream using the K first data blocks;
• responsive to determining an absence of reception of all of the K first data blocks, and that a total number of K+N blocks received is at least equal to K, decoding, using a forward error correction algorithm (FEC), to retrieve the missing data of the blocks K, and decoding and viewing the video stream in case of a positive result;
• responsive to determining that if the total number of K+N blocks received is less than K or in the absence of a positive result to the decoding via the forward error correction algorithm (FEC), sending, by the client device, of a unicast message giving the transmitting device information at least concerning the missing data of the blocks K;
• and
• if a statistical algorithm of the transmitting device organizes the returning of the missing data, checking the correct reception of the missing data returned by the transmitting device, decoding and viewing the video stream in case of a positive result;
• in the absence of correct reception of the missing data returned by the transmitting device or in the absence of returned data, checking the reception of a reference image with internal coding in the received data packet G, then if such a reference image is received complete:
• i) applying an error concealment algorithm to the reference image with internal coding, and
• ii) decoding and viewing the video stream using the application of the error concealment algorithm on the reference image to visually attenuate reception errors in the video data stream:
• in case of non-reception of a reference image with internal coding in the data packet G received:
• i) checking the reception of at least one reference image of a preceding data packet G−1 and a subsequent data packet G+1,
• ii) executing an interpolation method on the uncompressed or linear data to reconstruct a damaged image, then
• iii) decoding and viewing the video stream using the reconstructed image.