xref: /utopia/UTPA2-700.0.x/modules/mfe/drv/mfe_ex/cModel/vlc.h (revision 53ee8cc121a030b8d368113ac3e966b4705770ef)

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/*!
 *************************************************************************************
 * \file vlc.h
 *
 * \brief
 *    Prototypes for VLC coding funtions
 * \author
 *     Karsten Suehring
 *************************************************************************************
 */

#ifndef _VLC_H_
#define _VLC_H_

	#define TRACE 0UL

//! Bitstream
typedef struct
{
    MS_S32             byte_pos;           //!< current position in bitstream;
    MS_S32             bits_to_go;         //!< current bitcounter
    MS_U8            byte_buf;           //!< current buffer for last written byte
    MS_U8            *streamBuffer;      //!< actual buffer for written bytes
    MS_S32             zerocount;
#if TRACE
    MS_BOOL             trace_enabled;
#endif
} Bitstream;

//! Syntax Element
typedef struct syntaxelement
{
    MS_S32                 type;           //!< type of syntax element for data part.
    MS_S32                 value1;         //!< numerical value of syntax element
    MS_S32                 value2;         //!< for blocked symbols, e.g. run/level
    MS_S32                 len;            //!< length of code
    MS_S32                 inf;            //!< info part of UVLC code
    MS_U32        bitpattern;     //!< UVLC bitpattern
    MS_S32                 context;        //!< CABAC context

#if TRACE
#define             TRACESTRING_SIZE 100UL            //!< size of trace string
    MS_S8                tracestring[TRACESTRING_SIZE];  //!< trace string
#endif

    //!< for mapping of syntaxElement to UVLC
    void    (*mapping)(MS_S32 value1, MS_S32 value2, MS_S32* len_ptr, MS_S32* info_ptr);

} SyntaxElement;

void SODBtoRBSP(Bitstream *currStream);
MS_S32 RBSPtoEBSP(MS_U8 *streamBuffer, MS_S32 begin_bytepos, MS_S32 end_bytepos, MS_S32 min_num_bytes);

MS_S32 u_1  (MS_S8 *tracestring, MS_S32 value, Bitstream *bitstream);
MS_S32 se_v (MS_S8 *tracestring, MS_S32 value, Bitstream *bitstream);
MS_S32 ue_v (MS_S8 *tracestring, MS_S32 value, Bitstream *bitstream);
MS_S32 u_v  (MS_S32 n, MS_S8 *tracestring, MS_S32 value, Bitstream *bitstream);

MS_S32 symbol2uvlc(SyntaxElement *se);
void ue_linfo(MS_S32 n, MS_S32 dummy, MS_S32 *len, MS_S32 *info);
void se_linfo(MS_S32 mvd, MS_S32 dummy, MS_S32 *len, MS_S32 *info);
void writeVlcByteAlign(Bitstream* currStream);
#endif