SYSTEM AND METHOD FOR TRANSPORTING HD VIDEO OVER HDMI WITH A REDUCED LINK RATE
In some aspects, the disclosure is directed to methods and systems for transporting multimedia data, such as ultra-high definition (UHD) video data or other video data, via a standard high-definition multimedia interface (HDMI), without requiring an increase in the link bit rate or increasing the number of signaling pairs. Display stream compression is utilized to compress a stream, and a transition minimized differential signal (TMDS) clock channel may be replaced by an ANSI 8b/10b encoded stream carrying additional data with a clock signal embedded within the stream. As this additional channel increases bandwidth by one-third, the systems and methods discussed herein provide four times more effective bandwidth than prior HDMI schemes, allowing UHD video to be transmitted via a signal HDMI link.
1 . A system for transporting high definition multimedia data via a high-definition multimedia interface (HDMI), comprising:
an HDMI source in communication with an HDMI receiver via a plurality of channels, the HDMI source configured to:
receive uncompressed multimedia data at a first number of characters;
compress the multimedia data to a second number of characters;
transmit a first portion of the compressed multimedia data comprising subsequent packets interleaved via two channels of the plurality of channels; and
transmit a second portion of the compressed multimedia data comprising a third packet via a third channel of the plurality of channels.
2 . The system of claim 1 , wherein the two channels of the plurality of channels utilize transition minimized differential signaling (TMDS) encoding.
3 . The system of claim 1 , wherein the third channel comprises a clock channel.
4 . The system of claim 1 , wherein the third channel utilizes ANSI 8b/10b encoding.
5 . The system of claim 2 , wherein the two channels of the plurality of channels utilize ANSI 8b/10b encoding.
6 . The system of claim 1 , wherein the HDMI source is further configured to transmit the third packet interleaved between the third channel and a fourth channel of the plurality of channels.
7 . The system of claim 1 , wherein each of packets of the compressed multimedia data includes two or more HDMI standard packets.
8 . The system of claim 7 , wherein each of packets of the compressed multimedia data includes at least one null packet.
9 . A method for transporting high definition multimedia data via a high-definition multimedia interface (HDMI), comprising:
compressing uncompressed video data into compressed video data; and
adjusting a timing of the compressed video data, comprising at least one of:
adjusting a horizontal blanking interval of the compressed video data by dividing an horizontal blanking interval of uncompressed video data into two or more; and
adjusting a vertical blanking interval of the compressed video data by dividing a vertical blanking interval of uncompressed video data into two or more.
10 . The method of claim 9 , wherein the adjusting the time of the compressed video data includes:
adjusting a horizontal blanking interval of the compressed video data by dividing an horizontal blanking interval of the uncompressed video data into two; and
adjusting a vertical blanking interval of the compressed video data by dividing a vertical blanking interval of the uncompressed video data into two.
11 . The method of claim 9 , wherein the adjusting the time of the compressed video data includes:
adjusting a horizontal blanking interval of the compressed video data by dividing an horizontal blanking interval of the uncompressed video data into four; and
setting a vertical blanking interval of the compressed video data to a vertical blanking interval of the uncompressed video data.
12 . The method of claim 9 , wherein the adjusting the time of the compressed video data includes:
setting a horizontal blanking interval of the compressed video data to a horizontal blanking interval of the uncompressed video data; and
adjusting a vertical blanking interval of the compressed video data by dividing a vertical blanking interval of the uncompressed video data into four.
13 . The method of claim 9 , further comprising:
before compression, dividing each line of the uncompressed video data into a plurality of uncompressed horizontal slices; and
compressing the plurality of uncompressed horizontal slices into a corresponding plurality of compressed slices to obtain compressed video data.
14 . The method of claim 13 , further comprising adjusting a timing of the compressed video data by combining portions of the plurality of compressed slices into a container line of the compressed video data.
15 . A method for transporting high definition multimedia data via a high-definition multimedia interface (HDMI), comprising:
dividing a forward error correction (FEC) packet into a plurality of mini-packets, each carrying a subset of FEC parity bits of the FEC packet;
inserting mini-packets into a video container line including active video data; and
transmitting the mini-packets on the video container line.
16 . The method of claim 15 , wherein the inserting the mini-packets into the video container line includes inserting the mini-packets periodically into the video container line.
17 . The method of claim 15 , wherein the mini-packets are free of packet headers.
18 . The method of claim 15 , further comprising:
carrying color phase across an interval between transmissions of mini-packets;
pausing color phase during a period of transmissions of mini-packets; and
synchronize color phase with the periodic insertion of mini-packets.
19 . The method of claim 15 , further comprising:
transmitting, prior to transmission of any video container lines, a picture parameter set (PPS) packet having information to decode a Display Stream Compression (DSC) compressed picture.
20 . The method of claim 15 , wherein the transmitting of the PPS packet includes:
transmitting the PPS packet in a burst of subpackets at a free data island during a vertical blanking interval (VBI).