Decode Chroma CAVLC bitstream
SSE2
| FwStatus | fwiDecodeCAVLCChromaDcCoeffs_H264_1u16s | ( | Fw32u ** ppBitStream, Fw32s * pBitOffset, Fw16s * pNumCoeff, Fw16s ** ppDstCoeffs, const Fw32s * pTblCoeffToken, const Fw32s ** ppTblTotalZerosCR, const Fw32s ** ppTblRunBefore ); |
| pBitOffset | Pointer to a bit position within the byte that ppBitStream points to. Valid within the range 0 to 7. The pointer is updated after motion vector decoding. | |
| pNumCoeff | Pointer to the output number of non-zero coefficients. | |
| pTblCoeffToken | Pointer to a table of coefficient tokens. | |
| ppBitStream | Double pointer to the current position in the bit stream. | |
| ppDstCoeffs | Double pointer to a 4x4 block of coefficients calculated by the function. The function shifts pointer *ppDstCoeffs on 16. | |
| ppTblRunBefore | Double pointer to a RunBefore table. | |
| ppTblTotalZerosCR | Double pointer to a chroma DC TotalZeros table. |
This function parses and decodes a source stream of MPEG-4/AVC Chroma DC video syntax elements in CAVLC format. Result coefficients are written to a series of 2X2 destination blocks.
Parameter pTblCoeffToken is = -1, equivalent to element pTblCoeffToken[3] of the DecodeCAVLCCoeffs_H264 function.Parameter pTblCoeffToken points to a table that contains codes, the number of trailing one transform coefficients and the total number of non-zero transform coefficients, in accordance with JVTG050 Table 9-5.
Each element of pointer array ppTblRunBefore except for ppTblRunBefore[0] points to a table that contains codes and values (JVTG050 run_before) in accordance with JVTG050 Table 9-10. Element ppTblRunBefore[0] is not used.
ppTblRunBefore[i] contains codes and values that correspond to JVTG050 zerosLeft =i, 0 < i < 7.
ppTblRunBefore[7] contains codes and values that correspond to JVTG050 zerosLeft > 6.
Each element of pointer array ppTblTotalZeros except for ppTblTotalZeros[0] points to a table that contains codes and values (JVTG050 total_zeros) in accordance with JVTG050 Table 9-9. Element ppTblTotalZeros[0] is not used.
Each element ppTblTotalZeros[i] contains codes and values that correspond to JVTG050 TotalCoeff = i, 0 < i < 4.