VLCEncode_JPEGXR

Performs VLC encoding.

Syntax

IppStatus ippiVLCEncode4x4Flex_JPEGXR_32s1u_C1R(const Ipp32s* pSrc, Ipp32u srcStep, IppBool chroma, Ipp32u numModelBits, Ipp32u numTrimBits, Ipp32s pDstResidual[16], Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, Ipp32u* pNumNonZero, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncode4x4Flex_JPEGXR_16s1u_C1R(const Ipp16s* pSrc, Ipp32u srcStep, IppBool chroma, Ipp32u numModelBits, Ipp32u numTrimBits, Ipp32s pDstResidual[16], Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, Ipp32u* pNumNonZero, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncode4x4_JPEGXR_32s1u_C1R(const Ipp32s* pSrc, Ipp32u srcStep, IppBool chroma, Ipp32u numModelBits, Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, Ipp32u* pNumNonZero, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncode4x4_JPEGXR_16s1u_C1R(const Ipp16s* pSrc, Ipp32u srcStep, IppBool chroma, Ipp32u numModelBits, Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, Ipp32u* pNumNonZero, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncodeDC444_JPEGXR_32s1u_C1R(const Ipp32s* pSrcCoeffsScan, Ipp32s numCoeffs, IppBool chroma, Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncodeDC422_JPEGXR_32s1u_C1R(const Ipp32s* pSrcCoeffsScan[14], Ipp32s numCoeffs, Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, IppiVLCState_JPEGXR* pVLCState);

IppStatus ippiVLCEncodeDC420_JPEGXR_32s1u_C1R(const Ipp32s* pSrcCoeffsScan[6], Ipp32s numCoeffs, Ipp8u** ppBitStream, Ipp32u* pBitsBuf, Ipp32u* pNumBits, IppiVLCState_JPEGXR* pVLCState);

Parameters

pSrc	Pointer to to the source 4x4 block of samples.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pSrcCoeffsScan	Pointer to to the source vector of DC coefficients scanned.
chroma	Channel type flag: ippFalse - luma channel, ippTrue - chroma channel.
numModelBits	Maximal number of bits to encode.
numTrimBits	Number of bits to trim.
pDstResidual	Pointer to the destination prediction residuals.
ppBitStream	Pointer to the moving pointer to the memory using for destination bitstream.
pBitsBuf	Pointer to the prefetch buffer with encoded bits that are not written into the bitstream.
pNumBits	Number of valid bits in the prefetch buffer.
pNumNonZero	Pointer to the number of coefficients with non-zero model bits.
pVLCState	Pointer to the VLC state structure.

Description

The functions ippiVLCEncode are declared in the ippj.h file.

These functions perform entropy encoding of 4x4 block or DC samples with or without prediction residual calculation.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if one of the specified pointers isNULL.
ippStsRangeErr	Indicates an error condition if pNumBits is greater than 32 or numTrimBits is greater than 15.