Method and system for generating an instantaneous decoding refresh (IDR) picture slice in an H.264/AVC compliant video data stream

摘要

A method for generating an Instantaneous Decoding Refresh (IDR) picture slice in an H.264/AVC compliant video data stream, the method including starting reception of the H.264/AVC compliant video data stream, finding in the H.264/AVC compliant video data stream an I-type picture and identifying it as a start picture, modifying and/or adding, in each slice header of the start picture, IDR specific syntax elements, removing, from each slice header of the start picture, non-IDR specific syntax elements, removing, from the H.264/AVC compliant video data stream, all reference and non-reference B slices between the start picture and the next I picture or P picture, following the start picture, that is either a frame or the first field, in decoding order, of a complementary field pair. Thereafter, starting from the first picture after the removed slices, for each slice header, received from the H.264/AVC compliant video data stream, executing the following steps, correcting frame_num parameter so that they are valid with reference to the previous picture, correcting references, found in the "Memory Management Control Operation" structure, as a function of the removed reference B pictures, correcting references, found in the "Reference picture list reordering" structure, as a function of the removed reference B pictures and restoring H.264/AVC slice encapsulation for each modified slice.