H.264 / AVC / MPEG-4 part10 cabac decoding. More...

#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/timer.h"
#include "config.h"
#include "cabac.h"
#include "cabac_functions.h"
#include "internal.h"
#include "avcodec.h"
#include "h264dec.h"
#include "h264data.h"
#include "h264_mvpred.h"
#include "mpegutils.h"

Macros
#define	CABAC(h) 1

#define	UNCHECKED_BITSTREAM_READER 1

#define	INT_BIT (CHAR_BIT * sizeof(int))

#define	DECODE_CABAC_MB_MVD(sl, list, n)

#define	CABAC_ON_STACK

#define	CC &cc

#define	DECODE_SIGNIFICANCE(coefs, sig_off, last_off)

#define	STORE_BLOCK(type)

Functions
void	ff_h264_init_cabac_states (const H264Context h, H264SliceContext sl)

int	ff_h264_decode_mb_cabac (const H264Context h, H264SliceContext sl)
	Decode a macroblock. More...

Detailed Description

H.264 / AVC / MPEG-4 part10 cabac decoding.

Author: Michael Niedermayer micha.nosp@m.elni.nosp@m.@gmx..nosp@m.at

Macro Definition Documentation

§ DECODE_CABAC_MB_MVD

#define DECODE_CABAC_MB_MVD	(	sl,
		list,
		n
	)

Value:

{\
    int amvd0 = sl->mvd_cache[list][scan8[n] - 1][0] +\
                sl->mvd_cache[list][scan8[n] - 8][0];\
    int amvd1 = sl->mvd_cache[list][scan8[n] - 1][1] +\
                sl->mvd_cache[list][scan8[n] - 8][1];\
\
    int mxd = decode_cabac_mb_mvd(sl, 40, amvd0, &mpx);\
    int myd = decode_cabac_mb_mvd(sl, 47, amvd1, &mpy);\
    if (mxd == INT_MIN || myd == INT_MIN) \
        return AVERROR_INVALIDDATA; \
    mx += mxd;\
    my += myd;\
}

§ DECODE_SIGNIFICANCE

#define DECODE_SIGNIFICANCE	(	coefs,
		sig_off,
		last_off
	)

Value:

for(last= 0; last < coefs; last++) { \
            uint8_t *sig_ctx = significant_coeff_ctx_base + sig_off; \
            if( get_cabac( CC, sig_ctx )) { \
                uint8_t *last_ctx = last_coeff_ctx_base + last_off; \
                index[coeff_count++] = last; \
                if( get_cabac( CC, last_ctx ) ) { \
                    last= max_coeff; \
                    break; \
                } \
            } \
        }\
        if( last == max_coeff -1 ) {\
            index[coeff_count++] = last;\
        }

Function Documentation

§ ff_h264_decode_mb_cabac()

int ff_h264_decode_mb_cabac	(	const H264Context *	h,
		H264SliceContext *	sl
	)

Decode a macroblock.

Decode a CABAC coded macroblock.

Returns: 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR if an error is noticed