libavcodec/rv34.c File Reference

RV30/40 decoder common data. More...

#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "golomb.h"
#include "mathops.h"
#include "rectangle.h"
#include "rv34vlc.h"
#include "rv34data.h"
#include "rv34.h"

Go to the source code of this file.

Functions

static void ZERO8x2 (void *dst, int stride)

static void rv34_apply_differences (RV34DecContext *r, int cbp)

static int is_mv_diff_gt_3 (int16_t(*motion_val)[2], int step)

static int rv34_set_deblock_coef (RV34DecContext *r)

static int rv34_decode_macroblock (RV34DecContext *r, int8_t *intra_types)

static int check_slice_end (RV34DecContext *r, MpegEncContext *s)

static int rv34_decode_slice (RV34DecContext *r, int end, const uint8_t *buf, int buf_size)

av_cold int ff_rv34_decode_init (AVCodecContext *avctx)

Initialize decoder.

static int get_slice_offset (AVCodecContext *avctx, const uint8_t *buf, int n)

int ff_rv34_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

av_cold int ff_rv34_decode_end (AVCodecContext *avctx)

RV30/40 4x4 block decoding functions

static int rv34_decode_cbp (GetBitContext *gb, RV34VLC *vlc, int table)

Decode coded block pattern.

static void decode_coeff (DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC *vlc)

Get one coefficient value from the bistream and store it.

static void decode_subblock (DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc)

Decode 2x2 subblock of coefficients.

static void rv34_decode_block (DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc)

Decode coefficients for 4x4 block.

static void rv34_dequant4x4 (DCTELEM *block, int Qdc, int Q)

Dequantize ordinary 4x4 block.

static void rv34_dequant4x4_16x16 (DCTELEM *block, int Qdc, int Q)

Dequantize 4x4 block of DC values for 16x16 macroblock.

RV30/40 bitstream parsing

int ff_rv34_get_start_offset (GetBitContext *gb, int mb_size)

Decode starting slice position.

static RV34VLC * choose_vlc_set (int quant, int mod, int type)

Select VLC set for decoding from current quantizer, modifier and frame type.

static int rv34_decode_mb_header (RV34DecContext *r, int8_t *intra_types)

Decode macroblock header and return CBP in case of success, -1 otherwise.

Variables

static const int rv34_mb_type_to_lavc [12]

translation of RV30/40 macroblock types to lavc ones

static RV34VLC intra_vlcs [NUM_INTRA_TABLES]

static RV34VLC inter_vlcs [NUM_INTER_TABLES]

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

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

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] = { 6, 7, 10, 11 }

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

static int rv34_decode_mv (RV34DecContext *r, int block_type)

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

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, int weighted, 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 rv4_weight (RV34DecContext *r)

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

static void rv34_mc_2mv_skip (RV34DecContext *r)

Macroblock reconstruction functions

#define LUMA_CBP_BLOCK_MASK   0x33

mask for retrieving all bits in coded block pattern corresponding to one 8x8 block

#define U_CBP_MASK   0x0F0000

#define V_CBP_MASK   0xF00000

static const int ittrans [9]

mapping of RV30/40 intra prediction types to standard H.264 types

static const int ittrans16 [4]

mapping of RV30/40 intra 16x16 prediction types to standard H.264 types

static void rv34_pred_4x4_block (RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)

Perform 4x4 intra prediction.

static void rv34_add_4x4_block (uint8_t *dst, int stride, DCTELEM block[64], int off)

add_pixels_clamped for 4x4 block

static int adjust_pred16 (int itype, int up, int left)

static void rv34_output_macroblock (RV34DecContext *r, int8_t *intra_types, int cbp, int is16)

RV30/40 VLC generating functions

static const int table_offs []

static VLC_TYPE table_data [117592][2]

static void rv34_gen_vlc (const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms, const int num)

Generate VLC from codeword lengths.

static av_cold void rv34_init_tables (void)

Initialize all tables.

Detailed Description

RV30/40 decoder common data.

Definition in file rv34.c.

Define Documentation

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

Definition at line 488 of file rv34.c.

Referenced by rv34_decode_slice().

#define LUMA_CBP_BLOCK_MASK 0x33

mask for retrieving all bits in coded block pattern corresponding to one 8x8 block

Definition at line 1045 of file rv34.c.

Referenced by rv34_apply_differences().

#define U_CBP_MASK 0x0F0000

Definition at line 1047 of file rv34.c.

Referenced by rv34_apply_differences().

#define V_CBP_MASK 0xF00000

Definition at line 1048 of file rv34.c.

Referenced by rv34_apply_differences().

Function Documentation

static int adjust_pred16	(	int	itype,
		int	up,
		int	left
	)			`[inline, static]`

Definition at line 952 of file rv34.c.

Referenced by rv34_output_macroblock().

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 493 of file rv34.c.

Referenced by rv34_decode_mv().

static int check_slice_end	(	RV34DecContext *	r,
		MpegEncContext *	s
	)			`[static]`

Definition at line 1186 of file rv34.c.

Referenced by rv34_decode_slice().

static RV34VLC* choose_vlc_set	(	int	quant,
		int	mod,
		int	type
	)			`[inline, static]`

Select VLC set for decoding from current quantizer, modifier and frame type.

Definition at line 342 of file rv34.c.

Referenced by rv34_decode_macroblock(), and rv34_decode_mb_header().

static void decode_coeff	(	DCTELEM *	dst,
		int	coef,
		int	esc,
		GetBitContext *	gb,
		VLC *	vlc
	)			`[inline, static]`

Get one coefficient value from the bistream and store it.

Definition at line 215 of file rv34.c.

Referenced by decode_subblock().

static void decode_subblock	(	DCTELEM *	dst,
		int	code,
		const int	is_block2,
		GetBitContext *	gb,
		VLC *	vlc
	)			`[inline, static]`

Decode 2x2 subblock of coefficients.

Definition at line 235 of file rv34.c.

Referenced by rv34_decode_block().

av_cold int ff_rv34_decode_end ( AVCodecContext * avctx )

Definition at line 1496 of file rv34.c.

int ff_rv34_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)

Definition at line 1384 of file rv34.c.

av_cold int ff_rv34_decode_init ( AVCodecContext * avctx )

Initialize decoder.

Definition at line 1328 of file rv34.c.

Referenced by rv30_decode_init(), and rv40_decode_init().

int ff_rv34_get_start_offset	(	GetBitContext *	gb,
		int	mb_size
	)

Decode starting slice position.

common decoding functions

Todo:: Maybe replace with ff_h263_decode_mba() ?

Definition at line 330 of file rv34.c.

Referenced by rv30_parse_slice_header(), and rv40_parse_slice_header().

static int get_slice_offset	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	n
	)			`[static]`

Definition at line 1378 of file rv34.c.

static int is_mv_diff_gt_3	(	int16_t(*)	motion_val[2],
		int	step
	)			`[static]`

Definition at line 1068 of file rv34.c.

Referenced by rv34_set_deblock_coef().

static void rv34_add_4x4_block	(	uint8_t *	dst,
		int	stride,
		DCTELEM	block[64],
		int	off
	)			`[static]`

add_pixels_clamped for 4x4 block

Definition at line 944 of file rv34.c.

Referenced by rv34_output_macroblock().

static void rv34_apply_differences	(	RV34DecContext *	r,
		int	cbp
	)			`[static]`

Definition at line 1053 of file rv34.c.

Referenced by rv34_decode_macroblock().

static void rv34_decode_block	(	DCTELEM *	dst,
		GetBitContext *	gb,
		RV34VLC *	rvlc,
		int	fc,
		int	sc
	)			`[inline, static]`

Decode coefficients for 4x4 block.

This is done by filling 2x2 subblocks with decoded coefficients in this order (the same for subblocks and subblock coefficients): o--o / / o--o

Definition at line 265 of file rv34.c.

Referenced by rv34_decode_macroblock().

static int rv34_decode_cbp	(	GetBitContext *	gb,
		RV34VLC *	vlc,
		int	table
	)			`[static]`

Decode coded block pattern.

Definition at line 182 of file rv34.c.

Referenced by rv34_decode_mb_header().

static int rv34_decode_macroblock	(	RV34DecContext *	r,
		int8_t *	intra_types
	)			`[static]`

Definition at line 1110 of file rv34.c.

Referenced by rv34_decode_slice().

static int rv34_decode_mb_header	(	RV34DecContext *	r,
		int8_t *	intra_types
	)			`[static]`

Decode macroblock header and return CBP in case of success, -1 otherwise.

Definition at line 353 of file rv34.c.

Referenced by rv34_decode_macroblock().

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 811 of file rv34.c.

Referenced by rv34_decode_mb_header().

static int rv34_decode_slice	(	RV34DecContext *	r,
		int	end,
		const uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 1201 of file rv34.c.

Referenced by ff_rv34_decode_frame().

static void rv34_dequant4x4	(	DCTELEM *	block,
		int	Qdc,
		int	Q
	)			`[inline, static]`

Dequantize ordinary 4x4 block.

Todo:: optimize

Definition at line 295 of file rv34.c.

Referenced by rv34_decode_macroblock().

static void rv34_dequant4x4_16x16	(	DCTELEM *	block,
		int	Qdc,
		int	Q
	)			`[inline, static]`

Dequantize 4x4 block of DC values for 16x16 macroblock.

Todo:: optimize

Definition at line 309 of file rv34.c.

Referenced by rv34_decode_macroblock().

static void rv34_gen_vlc	(	const uint8_t *	bits,
		int	size,
		VLC *	vlc,
		const uint8_t *	insyms,
		const int	num
	)			`[static]`

Generate VLC from codeword lengths.

Parameters:

	bits	codeword lengths (zeroes are accepted)
	size	length of input data
	vlc	output VLC
	insyms	symbols for input codes (NULL for default ones)
	num	VLC table number (for static initialization)

Definition at line 103 of file rv34.c.

Referenced by rv34_init_tables().

static av_cold void rv34_init_tables ( void ) [static]

Initialize all tables.

Definition at line 139 of file rv34.c.

Referenced by ff_rv34_decode_init().

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,
		int	weighted,
		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 641 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 734 of file rv34.c.

Referenced by rv34_decode_mv().

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

Definition at line 765 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_mc_2mv_skip ( RV34DecContext * r ) [static]

Definition at line 784 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_output_macroblock	(	RV34DecContext *	r,
		int8_t *	intra_types,
		int	cbp,
		int	is16
	)			`[static]`

Definition at line 968 of file rv34.c.

Referenced by rv34_decode_macroblock().

static void rv34_pred_4x4_block	(	RV34DecContext *	r,
		uint8_t *	dst,
		int	stride,
		int	itype,
		int	up,
		int	left,
		int	down,
		int	right
	)			`[static]`

Perform 4x4 intra prediction.

Definition at line 916 of file rv34.c.

Referenced by rv34_output_macroblock().

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 503 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 439 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_pred_mv_b	(	RV34DecContext *	r,
		int	block_type,
		int	dir
	)			`[static]`

motion vector prediction for B-frames

Definition at line 523 of file rv34.c.

Referenced by rv34_decode_mv().

static void rv34_pred_mv_rv3	(	RV34DecContext *	r,
		int	block_type,
		int	dir
	)			`[static]`

motion vector prediction - RV3 version

Definition at line 578 of file rv34.c.

Referenced by rv34_decode_mv().

static int rv34_set_deblock_coef ( RV34DecContext * r ) [static]

Definition at line 1080 of file rv34.c.

Referenced by rv34_decode_macroblock().

static void rv4_weight ( RV34DecContext * r ) [static]

Definition at line 743 of file rv34.c.

Referenced by rv34_mc_2mv(), and rv34_mc_2mv_skip().

static void ZERO8x2	(	void *	dst,
		int	stride
	)			`[inline, static]`

Definition at line 40 of file rv34.c.

Referenced by rv34_decode_mv(), and rv34_pred_mv_b().

Variable Documentation

const uint8_t avail_indexes[4] = { 6, 7, 10, 11 } [static]

availability index for subblocks

Definition at line 430 of file rv34.c.

Referenced by rv34_pred_mv(), and rv34_pred_mv_rv3().

const int chroma_coeffs[3] = { 0, 3, 5 } [static]

Definition at line 624 of file rv34.c.

Referenced by rv34_mc().

RV34VLC inter_vlcs[NUM_INTER_TABLES] [static]

Definition at line 63 of file rv34.c.

RV34VLC intra_vlcs[NUM_INTRA_TABLES] [static]

Definition at line 63 of file rv34.c.

const int ittrans[9] [static]

Initial value:

 {
 DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
 VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
}

mapping of RV30/40 intra prediction types to standard H.264 types

Definition at line 903 of file rv34.c.

const int ittrans16[4] [static]

Initial value:

 {
 DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
}

mapping of RV30/40 intra 16x16 prediction types to standard H.264 types

Definition at line 909 of file rv34.c.

const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 } [static]

number of motion vectors in each macroblock type

Definition at line 805 of file rv34.c.

Referenced by tgv_decode_inter().

const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 } [static]

macroblock partition height in 8x8 blocks

Definition at line 427 of file rv34.c.

Referenced by rv34_pred_mv().

const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 } [static]

macroblock partition width in 8x8 blocks

Definition at line 424 of file rv34.c.

Referenced by rv34_pred_mv().

const int rv34_mb_type_to_lavc[12] [static]

Initial value:

 {
    MB_TYPE_INTRA,
    MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,
    MB_TYPE_16x16   | MB_TYPE_L0,
    MB_TYPE_8x8     | MB_TYPE_L0,
    MB_TYPE_16x16   | MB_TYPE_L0,
    MB_TYPE_16x16   | MB_TYPE_L1,
    MB_TYPE_SKIP,
    MB_TYPE_DIRECT2 | MB_TYPE_16x16,
    MB_TYPE_16x8    | MB_TYPE_L0,
    MB_TYPE_8x16    | MB_TYPE_L0,
    MB_TYPE_16x16   | MB_TYPE_L0L1,
    MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC
}

translation of RV30/40 macroblock types to lavc ones

Definition at line 47 of file rv34.c.

Referenced by rv34_decode_mb_header().

VLC_TYPE table_data[117592][2] [static]

Definition at line 93 of file rv34.c.

Referenced by ff_ivi_init_static_vlc(), and rv34_gen_vlc().

const int table_offs[] [static]

Initial value:

 {
      0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,
   5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,
  14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,
  18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,
  28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,
  31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,
  41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,
  43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,
  54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,
  56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,
  64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,
  72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,
  79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,
  84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,
  91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,
  98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,
 103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,
 111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592
}

Definition at line 72 of file rv34.c.

Referenced by rv34_gen_vlc().


Functions
static void	ZERO8x2 (void *dst, int stride)
static void	rv34_apply_differences (RV34DecContext *r, int cbp)
static int	is_mv_diff_gt_3 (int16_t(*motion_val)[2], int step)
static int	rv34_set_deblock_coef (RV34DecContext *r)
static int	rv34_decode_macroblock (RV34DecContext r, int8_t intra_types)
static int	check_slice_end (RV34DecContext r, MpegEncContext s)
static int	rv34_decode_slice (RV34DecContext r, int end, const uint8_t buf, int buf_size)
av_cold int	ff_rv34_decode_init (AVCodecContext *avctx)
	Initialize decoder.
static int	get_slice_offset (AVCodecContext avctx, const uint8_t buf, int n)
int	ff_rv34_decode_frame (AVCodecContext avctx, void data, int data_size, AVPacket avpkt)
av_cold int	ff_rv34_decode_end (AVCodecContext *avctx)
RV30/40 4x4 block decoding functions
static int	rv34_decode_cbp (GetBitContext gb, RV34VLC vlc, int table)
	Decode coded block pattern.
static void	decode_coeff (DCTELEM dst, int coef, int esc, GetBitContext gb, VLC *vlc)
	Get one coefficient value from the bistream and store it.
static void	decode_subblock (DCTELEM dst, int code, const int is_block2, GetBitContext gb, VLC *vlc)
	Decode 2x2 subblock of coefficients.
static void	rv34_decode_block (DCTELEM dst, GetBitContext gb, RV34VLC *rvlc, int fc, int sc)
	Decode coefficients for 4x4 block.
static void	rv34_dequant4x4 (DCTELEM *block, int Qdc, int Q)
	Dequantize ordinary 4x4 block.
static void	rv34_dequant4x4_16x16 (DCTELEM *block, int Qdc, int Q)
	Dequantize 4x4 block of DC values for 16x16 macroblock.
RV30/40 bitstream parsing
int	ff_rv34_get_start_offset (GetBitContext *gb, int mb_size)
	Decode starting slice position.
static RV34VLC *	choose_vlc_set (int quant, int mod, int type)
	Select VLC set for decoding from current quantizer, modifier and frame type.
static int	rv34_decode_mb_header (RV34DecContext r, int8_t intra_types)
	Decode macroblock header and return CBP in case of success, -1 otherwise.
Variables
static const int	rv34_mb_type_to_lavc [12]
	translation of RV30/40 macroblock types to lavc ones
static RV34VLC	intra_vlcs [NUM_INTRA_TABLES]
static RV34VLC	inter_vlcs [NUM_INTER_TABLES]
motion vector related code (prediction, reconstruction, motion compensation)
#define	GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)
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] = { 6, 7, 10, 11 }
	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
static int	rv34_decode_mv (RV34DecContext *r, int block_type)
	Decode motion vector differences and perform motion vector reconstruction and motion compensation.
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, int weighted, 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	rv4_weight (RV34DecContext *r)
static void	rv34_mc_2mv (RV34DecContext *r, const int block_type)
static void	rv34_mc_2mv_skip (RV34DecContext *r)
Macroblock reconstruction functions
#define	LUMA_CBP_BLOCK_MASK 0x33
	mask for retrieving all bits in coded block pattern corresponding to one 8x8 block
#define	U_CBP_MASK 0x0F0000
#define	V_CBP_MASK 0xF00000
static const int	ittrans [9]
	mapping of RV30/40 intra prediction types to standard H.264 types
static const int	ittrans16 [4]
	mapping of RV30/40 intra 16x16 prediction types to standard H.264 types
static void	rv34_pred_4x4_block (RV34DecContext r, uint8_t dst, int stride, int itype, int up, int left, int down, int right)
	Perform 4x4 intra prediction.
static void	rv34_add_4x4_block (uint8_t *dst, int stride, DCTELEM block[64], int off)
	add_pixels_clamped for 4x4 block
static int	adjust_pred16 (int itype, int up, int left)
static void	rv34_output_macroblock (RV34DecContext r, int8_t intra_types, int cbp, int is16)
RV30/40 VLC generating functions
static const int	table_offs []
static VLC_TYPE	table_data [117592][2]
static void	rv34_gen_vlc (const uint8_t bits, int size, VLC vlc, const uint8_t *insyms, const int num)
	Generate VLC from codeword lengths.
static av_cold void	rv34_init_tables (void)
	Initialize all tables.