Samsung S5PC100, User Manual, Page: 1578 / 1863

MFC (MULTI FORMAT CODEC)
S5PC100 USER’S MANUAL (REV1.0)
9.11-10
extracted by VME_DCTQ and predictor which is extracted by MV, into DPB (Decoded Picture Buffer) memory
area. Predictors, which are muxed with Inter predictors and Intra predictors as MB mode, are added to Residual
values. And the results go to VME_DB part. After deblock filtering, VME_DB part write filtered MB into the DPB
(Decoded Picture Buffer) area which include reference pictures. VME_PRED has one dedicated DMA modules, so
it writes current motion vector and reads co-loccated motion vector for direct mode in B picture.
In INTRA PREDICTION, intra prediction is operated in H.264 case. Intra prediction mode is derived from INTRA
MODE DECISION that uses the full search methods for Intra4x4 block, Intra16x16 block and Chroma
components. In INTER PREDICTION of Encoder, MV (Motion Vector) for the INTER PREDICTION is derived from
ME (Motion Estimation). In VC-1 decoding, intensity compensation can be performed only once. Prediction mode
is calculated by intra prediction mode or inter prediction mode according to MB prediction mode. The predicted
data is subtracted from the original pixel and the results go to Forward Transform/Q. After forward Transform/Q,
one path goes to the VSP part, the second path is similar to the decoder operation. Residual values of this second
(decoding) path are added to the predictor and the results go to the VME_DB part. In Encoder, no DMA module is
used. The VME_PRED uses only 1 reference frame for the prediction
3.2.5 DEBLOCKING FILTER
Deblocking filter removes blocking artifacts resulted from quantization. The MFC4.0 deblocking filter supports on-
the-fly H.264 in-loop filter, H.263 annex J in-loop filter, VC1 overlap smoothing filter, VC1 in-loop filter and post
filter. For multi format overlap smoothing and in-loop filter, the deblocking filter operates within coding loop.
Filtered frames are used as reference frames for motion compensation of subsequent coded frames. Post filter
operates outside the coding loop for display.
The data flow of multi format overlap smoothing and in-loop filter is shown in Figure 9.11-5. Under the multi format
overlap smoothing and in-loop filter operation, filtered-data is written in reconstruction area through direct memory
access (DMA) and used as reference frames. Beside unfiltered-data is written in upper row area and used as
neighbor macroblocks at following row operation.
Stream
Processor Transform/
Scal./Quant
Scaling & Inv-
Transform
Intra frame
Prediction
Motion
Compensation
Motion
Estimation
De-blocking
filter
Edge filter
DMA
Bit-stream
Frame Buffer
Recon. area
Stream
Processor
Quant Coeffs
Motion Data
Decoder
Upper. area
Figure 9.11-4 Data Flow of H.264 In-Loop Filter