h264_cabac.c File Reference

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

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

Go to the source code of this file.

Macros
#define	CABAC(h)
#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)
static av_always_inline uint16_t	pack8to16 (unsigned a, unsigned b)
static int	decode_cabac_field_decoding_flag (const H264Context *h, H264SliceContext *sl)
static int	decode_cabac_intra_mb_type (H264SliceContext *sl, int ctx_base, int intra_slice)
static int	decode_cabac_mb_skip (const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y)
static int	decode_cabac_mb_intra4x4_pred_mode (H264SliceContext *sl, int pred_mode)
static int	decode_cabac_mb_chroma_pre_mode (const H264Context *h, H264SliceContext *sl)
static int	decode_cabac_mb_cbp_luma (H264SliceContext *sl)
static int	decode_cabac_mb_cbp_chroma (H264SliceContext *sl)
static int	decode_cabac_p_mb_sub_type (H264SliceContext *sl)
static int	decode_cabac_b_mb_sub_type (H264SliceContext *sl)
static int	decode_cabac_mb_ref (H264SliceContext *sl, int list, int n)
static int	decode_cabac_mb_mvd (H264SliceContext *sl, int ctxbase, int amvd, int *mvda)
static av_always_inline int	get_cabac_cbf_ctx (H264SliceContext *sl, int cat, int idx, int max_coeff, int is_dc)
static av_always_inline void	decode_cabac_residual_internal (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff, int is_dc, int chroma422)
static av_noinline void	decode_cabac_residual_dc_internal (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, int max_coeff)
static av_noinline void	decode_cabac_residual_dc_internal_422 (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, int max_coeff)
static av_noinline void	decode_cabac_residual_nondc_internal (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff)
static av_always_inline void	decode_cabac_residual_dc (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, int max_coeff)
static av_always_inline void	decode_cabac_residual_dc_422 (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, int max_coeff)
static av_always_inline void	decode_cabac_residual_nondc (const H264Context *h, H264SliceContext *sl, int16_t *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff)
static av_always_inline void	decode_cabac_luma_residual (const H264Context *h, H264SliceContext *sl, const uint8_t *scan, const uint8_t *scan8x8, int pixel_shift, int mb_type, int cbp, int p)
int	ff_h264_decode_mb_cabac (const H264Context *h, H264SliceContext *sl)
	Decode a macroblock.

Variables
static const int8_t	cabac_context_init_I [1024][2]
static const int8_t	cabac_context_init_PB [3][1024][2]

Detailed Description

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

Author

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

Definition in file h264_cabac.c.

Macro Definition Documentation

CABAC

#define CABAC

(

h

)

Value:

1

Definition at line 28 of file h264_cabac.c.

Referenced by fill_decode_caches(), fill_filter_caches(), filter_mb_dir(), write_back_motion(), and write_back_motion_list().

UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 29 of file h264_cabac.c.

INT_BIT

#define INT_BIT   (CHAR_BIT * sizeof(int))

Definition at line 30 of file h264_cabac.c.

Referenced by decode_cabac_mb_mvd().

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;\
}

Definition at line 1543 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

CABAC_ON_STACK

#define CABAC_ON_STACK

CC

#define CC   &cc

Referenced by decode_cabac_residual_internal().

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;\
        }

Referenced by decode_cabac_residual_internal().

STORE_BLOCK

#define STORE_BLOCK

(

type

)

Referenced by decode_cabac_residual_internal().

Function Documentation

ff_h264_init_cabac_states()

void ff_h264_init_cabac_states	(	const H264Context *	h,
		H264SliceContext *	sl )

Definition at line 1262 of file h264_cabac.c.

Referenced by decode_slice().

pack8to16()

static av_always_inline uint16_t pack8to16 ( unsigned a, unsigned b )

static

Definition at line 1283 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_field_decoding_flag()

static int decode_cabac_field_decoding_flag ( const H264Context * h, H264SliceContext * sl )

static

Definition at line 1292 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_intra_mb_type()

static int decode_cabac_intra_mb_type ( H264SliceContext * sl, int ctx_base, int intra_slice )

static

Definition at line 1304 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_skip()

static int decode_cabac_mb_skip ( const H264Context * h, H264SliceContext * sl, int mb_x, int mb_y )

static

Definition at line 1336 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_intra4x4_pred_mode()

static int decode_cabac_mb_intra4x4_pred_mode ( H264SliceContext * sl, int pred_mode )

static

Definition at line 1373 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_chroma_pre_mode()

static int decode_cabac_mb_chroma_pre_mode ( const H264Context * h, H264SliceContext * sl )

static

Definition at line 1387 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_cbp_luma()

static int decode_cabac_mb_cbp_luma ( H264SliceContext * sl )

static

Definition at line 1412 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_cbp_chroma()

static int decode_cabac_mb_cbp_chroma ( H264SliceContext * sl )

static

Definition at line 1429 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_p_mb_sub_type()

static int decode_cabac_p_mb_sub_type ( H264SliceContext * sl )

static

Definition at line 1449 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_b_mb_sub_type()

static int decode_cabac_b_mb_sub_type ( H264SliceContext * sl )

static

Definition at line 1459 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_ref()

static int decode_cabac_mb_ref ( H264SliceContext * sl, int list, int n )

static

Definition at line 1477 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_mb_mvd()

static int decode_cabac_mb_mvd ( H264SliceContext * sl, int ctxbase, int amvd, int * mvda )

static

Definition at line 1506 of file h264_cabac.c.

get_cabac_cbf_ctx()

static av_always_inline int get_cabac_cbf_ctx ( H264SliceContext * sl, int cat, int idx, int max_coeff, int is_dc )

static

Definition at line 1558 of file h264_cabac.c.

Referenced by decode_cabac_residual_dc(), decode_cabac_residual_dc_422(), and decode_cabac_residual_nondc().

decode_cabac_residual_internal()

static av_always_inline void decode_cabac_residual_internal ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, const uint32_t * qmul, int max_coeff, int is_dc, int chroma422 )

static

Definition at line 1591 of file h264_cabac.c.

Referenced by decode_cabac_residual_dc_internal(), decode_cabac_residual_dc_internal_422(), and decode_cabac_residual_nondc_internal().

decode_cabac_residual_dc_internal()

static av_noinline void decode_cabac_residual_dc_internal ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, int max_coeff )

static

Definition at line 1778 of file h264_cabac.c.

Referenced by decode_cabac_residual_dc().

decode_cabac_residual_dc_internal_422()

static av_noinline void decode_cabac_residual_dc_internal_422 ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, int max_coeff )

static

Definition at line 1788 of file h264_cabac.c.

Referenced by decode_cabac_residual_dc_422().

decode_cabac_residual_nondc_internal()

static av_noinline void decode_cabac_residual_nondc_internal ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, const uint32_t * qmul, int max_coeff )

static

Definition at line 1798 of file h264_cabac.c.

Referenced by decode_cabac_residual_nondc().

decode_cabac_residual_dc()

static av_always_inline void decode_cabac_residual_dc ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, int max_coeff )

static

Definition at line 1821 of file h264_cabac.c.

Referenced by decode_cabac_luma_residual(), and ff_h264_decode_mb_cabac().

decode_cabac_residual_dc_422()

static av_always_inline void decode_cabac_residual_dc_422 ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, int max_coeff )

static

Definition at line 1837 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

decode_cabac_residual_nondc()

static av_always_inline void decode_cabac_residual_nondc ( const H264Context * h, H264SliceContext * sl, int16_t * block, int cat, int n, const uint8_t * scantable, const uint32_t * qmul, int max_coeff )

static

Definition at line 1850 of file h264_cabac.c.

Referenced by decode_cabac_luma_residual(), and ff_h264_decode_mb_cabac().

decode_cabac_luma_residual()

static av_always_inline void decode_cabac_luma_residual ( const H264Context * h, H264SliceContext * sl, const uint8_t * scan, const uint8_t * scan8x8, int pixel_shift, int mb_type, int cbp, int p )

static

Definition at line 1870 of file h264_cabac.c.

Referenced by ff_h264_decode_mb_cabac().

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

Definition at line 1920 of file h264_cabac.c.

Referenced by decode_slice().

Variable Documentation

cabac_context_init_I

const int8_t cabac_context_init_I[1024][2]

static

Definition at line 50 of file h264_cabac.c.

Referenced by ff_h264_init_cabac_states().

cabac_context_init_PB

const int8_t cabac_context_init_PB[3][1024][2]

static

Definition at line 362 of file h264_cabac.c.

Referenced by ff_h264_init_cabac_states().