Intel IPP implements functions that are built to support the ISO/IEC 14496-2 MPEG-4 video decoder. MPEG-4 (see [ISO14496]) is a widely used coding method for video signals in various applications such as digital storage media, Internet, various forms of wired or wireless communications, etc. The functions, along with those described in the General Functions, cover the following aspects of MPEG-4 decoder:
- block-based variable length code (VLC) decoding and inverse zigzag scan
- Inverse quantization, inverse zigzag positioning, and IDCT
- Block layer coefficient reconstruction, including bitstream parsing, VLC decoding, inverse quantization, inverse zigzag positioning, with appropriate clipping on each step
- overlapped block motion compensation
- motion compensation
- postprocessing for coding noise reduction including deblocking and deringing filters.
Note
All MPEG-4 functions can be applied if short_video_header equals 0. If short_video_header equals 1, use H.263 decoder functions.