Predict motion of luma macroblock intra-frame

Supported Technologies



FwStatus   fwiPredictIntra_16x16_H264_8u_C1IR ( Fw8u * pSrcDstFw32s srcDstStepFwIntra16x16PredMode_H264 predModeFw32s availability );


availability   Flag that indicates availability of the samples used for prediction.
pSrcDst   Pointer to the start of the block.
predMode   Specifies the prediction mode of the Intra_4x4 prediction process for luma samples.
srcDstStep   Source and destination buffer step size in bytes (width of both buffers in bytes).


This function performs intra-frame motion prediction by comparing a 16X16 luma macroblock to previously-encoded neighboring 16X16 luma macroblocks within the same frame. Results are written back to the source location. Comparison is done in accordance with JVTG050 8.3.2., using one of the following prediction modes specified by parameter predMode.

 Name of Constant  Prediction Mode   JVTG050 Reference
   FW_16x16_VERT       Intra_16x16_Vertical
   FW_16x16_HOR        Intra_16x16_Horizontal
   FW_16x16_DC        Intra_16x16_DC
   FW_16x16_PLANE       Intra_16x16_Plane

The availability parameter is calculated as follows.


The constants FW_LEFT, FW_UPPER_LEFT, and FW_UPPER are from FwLayoutFlag.

The variables B1, B2, and B3 take the following values.

 0 - when a macroblock is not available for prediction
 1 - when a macroblock is available for prediction