vlcutility.h

Nokia H.264/AVC Encoder/Decoder Usage Manual

/*
COPYRIGHT, LICENSE AND WARRANTY INFORMATION

This software module has been originally developed by Nokia Corporation. 

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limited license under copyrights owned by Nokia to use the Software for 
the sole purpose of creating, manufacturing, selling, marketing, or  
distributing (including the right to make modifications to the Software) 
a fully compliant decoder implementation (hereinafter "Decoder") of 
ITU-T Recommendation H.264 / ISO/IEC International Standard 14496-10 and 
an encoder implementation producing output that is decodable with the 
Decoder.

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be infringed by the Software against  
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USE.

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OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
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*/



#ifndef _VLC_UTILITY_H_
#define _VLC_UTILITY_H_


#include "globals.h"
#include "bitbuffer.h"


#define vlcGetMvBits(x, y)  ((int) uvlcBitsSigned[(x)+511]+(int) uvlcBitsSigned[(y)+511])

// bits on encode reference frame index, in truncated exp-Golomb code
#define vlcGetRefIndexBits(range, idx) (((range) <= 1) ? \
                                        (range) : uvlcBitsUnsigned[(idx)])

#define vlcuGetChromaNC(cbpDC, cbpC) ((cbpC == 0) ? ((cbpDC == 0) ? 0 : 1) : 2)

#define vlcuMapSigned(sV)   (((sV) > 0) ? (2*(sV) - 1) : (2*(-(sV))))

int  vlcuGetLuma8x8cbp(int cbpY);

int  vlcuSendCoefLevelVLC0(bitbuffer_s *bitbuf, int coef);

int  vlcuSendCoefLevelVLCN(bitbuffer_s *bitbuf, int tabNum, int coef);

void vlcuZigZagScan4x4(int src[BLK_SIZE][BLK_SIZE], int *dst);

int  vlcuUVLCSize(unsigned int codeNum);

int  vlcuSendUVLC(bitbuffer_s *bitbuf, unsigned int codeNum);

int  vlcuSendSignedUVLC(bitbuffer_s *bitbuf, int sValue);

int  vlcuSendFLC(bitbuffer_s *bitbuf, unsigned int codeNum, int len);

int  vlcuSendNalUnitStartCodePrefix(bitbuffer_s *bitbuf, int zeroByte);

int  vlcuSendNalHead(bitbuffer_s *bitbuf, int nal_ref_idc, int nal_type);

int  vlcuSendEndOfSeq(bitbuffer_s *bitbuf);


extern const int8 uvlcBitsUnsigned[];
extern const int8 uvlcBitsSigned[];
extern const int8 numOfRefPar[7];


// macros defined to follow the standard specification
#define ue_v(bitbuf, codeNum)  vlcuSendUVLC(bitbuf, codeNum)
#define se_v(bitbuf, codeNum)  vlcuSendUVLC(bitbuf, vlcuMapSigned((codeNum)))
#define u_n(bitbuf, bits, len) vlcuSendFLC(bitbuf, bits, len)


#define CALCULATE_DELTA_QP(deltaQp, qp, prevQp)   {       \
  deltaQp = qp - prevQp;                                  \
  if (deltaQp < -(MAX_QP - MIN_QP + 1)/2)                 \
  deltaQp += MAX_QP - MIN_QP + 1;                       \
  if (deltaQp >= (MAX_QP - MIN_QP + 1)/2)                  \
  deltaQp -= MAX_QP - MIN_QP + 1;                       \
}


#endif  // _VLC_UTILITY_H_