Since there seems to be quite a few ppl writing H.264 frame subclasses, I think i'll give a gist of what I learned when i was creating one;
Basically, my stream was 0x00 00 00 01 delimited single NAL unit entities - the first NAL was my SPS, then PPS and then picture slices after that. In your framer, after the delimiter, you read 1 byte, which is contains basic info about the NAL unit - once you have this byte, you parse it: NAL_nri = (readChar >> 5) & 0x3; NAL_type = readChar & 0x1F; NAL_forbidden = readChar & 0x80; Now, if your NAL unit size is less than ethernet MTU (~1400 bytes), then you can go ahead and do single-NAL unit mode in which case you drop the 4 byte delimiter, and pass this to liveMedia to send If it is > 1400 byte (most of the time they are), then you'll have to do FU-A mode; FU-A mode specially requires an indicator and a header. FU_indicator = (NAL_forbidden << 7) | (NAL_nri << 5) | (28); //28 is FU-A type FU_header = (NAL_type) | (FUA_START); //FUA_START is 1<<7 This indicator goes first, then the header, and then you append your NAL unit data - NOTE however, that the NAL unit data you append should not have the delimiter AND the 1 byte NAL info present. After this first transmission, you send successive FU-A packets with the remaining NAL unit data with the same FU_indicator, but a changed FU_header if the current packet you're sending is not the last packet, then: FU_header = (NAL_type); //dont signal the end yet, as per RFC Spec if it is the last packet then: FU_header = (NAL_type) | (FUA_END); //signal last frame of NAL unit, FUA_END = 1<<6 That's as easy as it gets to sending H.264 data to VLC and it should play it beautifully :) Jerry Johns Design Engineer Nuvation Research Corp - Canada Tel: (519) 746-2304 ext. 225 www.nuvation.com <http://www.nuvation.com>
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