Samsung S5PC100, User Manual, Page: 1595 / 1863

S5PC100 USER’S MANUAL (REV1.0)
MFC (MULTI FORMAT CODEC)
9.11-27
7.2.2 ENCODER CASE
The stream format is same with the decoder. Each stream contains the frame data and the stream header if it
exists.
The Host shall set the VSP_DMA configuration (EXT_BUF_START_ADDR, EXT_BUF_END_ADDR and
HOST_PTR) at every frame including the first frame with the stream header. The EXT_BUF_START_ADDR
indicates where the encoded stream shall start and the EXT_BUF_END_ADDR indicates until where the encoded
stream can be written and the HOST_PTR shall be set as same with the EXT_BUF_START_ADDR even though it
is not used because the VSP_DMA is designed as the Circular Buffer Scheme. After encoding a frame, the Host
can get information about how many bits are encoded for the corresponding frame using the ENC_UNIT_SIZE.
The Host should guarantee that the EXT_BUF_START_ADDR and the EXT_BUF_END_ADDR have a range
enough to include one frame-sized stream in encoding. If not, it may be stuck.
H.264 and MPEG4 Case
The Stream header is located at the first position of the stream. So the encoded stream for the first frame shall
contain stream header as well as the frame data. The Stream header contains the SPS and PPS. Except for the
first frame, the encoded stream contains only frame data. And there is another SFR named ENC_HEADER_SIZE
to indicate how many bytes are for the stream header.
The Host shall set the FRAME_START and then check the OPERATION_DONE at every frame. In case of
encoding, there is no need to set the SEQUENCE_START and check the HEADER_DONE.
H.263 Case
In case of H.263, there is no stream header in the encoded stream. So the encoded stream contains only the
frame data.