motion vector related code (prediction, reconstruction, motion compensation)


Defines
#define	GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)
Functions
static void	rv34_pred_mv (RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
	motion vector prediction
static int	calc_add_mv (RV34DecContext *r, int dir, int val)
	Calculate motion vector component that should be added for direct blocks.
static void	rv34_pred_b_vector (int A[2], int B[2], int C[2], int A_avail, int B_avail, int C_avail, int mx, int my)
	Predict motion vector for B-frame macroblock.
static void	rv34_pred_mv_b (RV34DecContext *r, int block_type, int dir)
	motion vector prediction for B-frames
static void	rv34_pred_mv_rv3 (RV34DecContext *r, int block_type, int dir)
	motion vector prediction - RV3 version
static void	rv34_mc (RV34DecContext r, const int block_type, const int xoff, const int yoff, int mv_off, const int width, const int height, int dir, const int thirdpel, qpel_mc_func(qpel_mc)[16], h264_chroma_mc_func(*chroma_mc))
	generic motion compensation function
static void	rv34_mc_1mv (RV34DecContext *r, const int block_type, const int xoff, const int yoff, int mv_off, const int width, const int height, int dir)
static void	rv34_mc_2mv (RV34DecContext *r, const int block_type)
static void	rv34_mc_2mv_skip (RV34DecContext *r)
static int	rv34_decode_mv (RV34DecContext *r, int block_type)
	Decode motion vector differences and perform motion vector reconstruction and motion compensation.
Variables
static const uint8_t	part_sizes_w [RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 }
	macroblock partition width in 8x8 blocks
static const uint8_t	part_sizes_h [RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 }
	macroblock partition height in 8x8 blocks
static const uint8_t	avail_indexes [4] = { 5, 6, 9, 10 }
	availability index for subblocks
static const int	chroma_coeffs [3] = { 0, 3, 5 }
static const int	num_mvs [RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 }
	number of motion vectors in each macroblock type

Define Documentation

#define GET_PTS_DIFF	(	a,
		b		)	((a - b + 8192) & 0x1FFF)

Definition at line 471 of file rv34.c.

Referenced by calc_add_mv().

Function Documentation

static int calc_add_mv	(	RV34DecContext *	r,
		int	dir,
		int	val
	)			`[static]`

Calculate motion vector component that should be added for direct blocks.

Definition at line 476 of file rv34.c.

Referenced by rv34_decode_mv().

static int rv34_decode_mv	(	RV34DecContext *	r,
		int	block_type
	)			`[static]`

Decode motion vector differences and perform motion vector reconstruction and motion compensation.

Definition at line 763 of file rv34.c.

Referenced by rv34_decode_mb_header().

static void rv34_mc	(	RV34DecContext *	r,
		const int	block_type,
		const int	xoff,
		const int	yoff,
		int	mv_off,
		const int	width,
		const int	height,
		int	dir,
		const int	thirdpel,
		qpel_mc_func(*)	qpel_mc[16],
		h264_chroma_mc_func *	chroma_mc
	)			`[inline, static]`

generic motion compensation function

Parameters:

	r	decoder context
	block_type	type of the current block
	xoff	horizontal offset from the start of the current block
	yoff	vertical offset from the start of the current block
	mv_off	offset to the motion vector information
	width	width of the current partition in 8x8 blocks
	height	height of the current partition in 8x8 blocks
	dir	motion compensation direction (i.e. from the last or the next reference frame)
	thirdpel	motion vectors are specified in 1/3 of pixel
	qpel_mc	a set of functions used to perform luma motion compensation
	chroma_mc	a set of functions used to perform chroma motion compensation

Definition at line 627 of file rv34.c.

Referenced by rv34_mc_1mv(), rv34_mc_2mv(), and rv34_mc_2mv_skip().

static void rv34_mc_1mv	(	RV34DecContext *	r,
		const int	block_type,
		const int	xoff,
		const int	yoff,
		int	mv_off,
		const int	width,
		const int	height,
		int	dir
	)			`[static]`

Definition at line 713 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_mc_2mv	(	RV34DecContext *	r,
		const int	block_type
	)			`[static]`

Definition at line 724 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_mc_2mv_skip ( RV34DecContext * r ) [static]

Definition at line 738 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_pred_b_vector	(	int	A[2],
		int	B[2],
		int	C[2],
		int	A_avail,
		int	B_avail,
		int	C_avail,
		int *	mx,
		int *	my
	)			`[inline, static]`

Predict motion vector for B-frame macroblock.

Definition at line 490 of file rv34.c.

Referenced by rv34_pred_mv_b().

static void rv34_pred_mv	(	RV34DecContext *	r,
		int	block_type,
		int	subblock_no,
		int	dmv_no
	)			`[static]`

motion vector prediction

Motion prediction performed for the block by using median prediction of motion vectors from the left, top and right top blocks but in corner cases some other vectors may be used instead.

Definition at line 422 of file rv34.c.

Referenced by rv34_decode_mv().