libavcodec/vc1dec.c File Reference

VC-1 and WMV3 decoder. More...

#include "internal.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "vc1.h"
#include "vc1data.h"
#include "vc1acdata.h"
#include "msmpeg4data.h"
#include "unary.h"
#include "simple_idct.h"
#include "mathops.h"
#include "vdpau_internal.h"
#include <assert.h>

Go to the source code of this file.

Defines

#define MB_INTRA_VLC_BITS   9

#define DC_VLC_BITS   9

#define AC_VLC_BITS   9

#define inc_blk_idx(idx)

#define transpose(x)   ((x>>3) | ((x&7)<<3))

Enumerations

VC-1 Bitplane decoding

See also:
8.7, p56

enum Imode {
  IMODE_RAW, IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6,
  IMODE_DIFF6, IMODE_ROWSKIP, IMODE_COLSKIP, IMODE_RAW,
  IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6, IMODE_DIFF6,
  IMODE_ROWSKIP, IMODE_COLSKIP
}

Imode types. More...

Functions

static int vc1_init_common (VC1Context *v)

Init VC-1 specific tables and VC1Context members.

static void vc1_put_signed_blocks_clamped (VC1Context *v)

static void vc1_loop_filter_iblk (VC1Context *v, int pq)

static void vc1_loop_filter_iblk_delayed (VC1Context *v, int pq)

static void vc1_smooth_overlap_filter_iblk (VC1Context *v)

static void vc1_mc_1mv (VC1Context *v, int dir)

Do motion compensation over 1 macroblock Mostly adapted hpel_motion and qpel_motion from mpegvideo.c.

static void vc1_mc_4mv_luma (VC1Context *v, int n)

Do motion compensation for 4-MV macroblock - luminance block.

static int median4 (int a, int b, int c, int d)

static void vc1_mc_4mv_chroma (VC1Context *v)

Do motion compensation for 4-MV macroblock - both chroma blocks.

static av_always_inline void vc1_apply_p_v_loop_filter (VC1Context *v, int block_num)

static av_always_inline void vc1_apply_p_h_loop_filter (VC1Context *v, int block_num)

static void vc1_apply_p_loop_filter (VC1Context *v)

static int vc1_decode_p_mb (VC1Context *v)

Decode one P-frame MB (in Simple/Main profile).

static void vc1_decode_b_mb (VC1Context *v)

Decode one B-frame MB (in Main profile).

static void vc1_decode_i_blocks (VC1Context *v)

Decode blocks of I-frame.

static void vc1_decode_i_blocks_adv (VC1Context *v)

Decode blocks of I-frame for advanced profile.

static void vc1_decode_p_blocks (VC1Context *v)

static void vc1_decode_b_blocks (VC1Context *v)

static void vc1_decode_skip_blocks (VC1Context *v)

static void vc1_decode_blocks (VC1Context *v)

static float get_float_val (GetBitContext *gb)

static void vc1_sprite_parse_transform (VC1Context *v, GetBitContext *gb, float c[7])

static void vc1_parse_sprites (VC1Context *v, GetBitContext *gb)

static av_cold int vc1_decode_init (AVCodecContext *avctx)

Initialize a VC1/WMV3 decoder.

static int vc1_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

Decode a VC1/WMV3 frame.

static av_cold int vc1_decode_end (AVCodecContext *avctx)

Close a VC1/WMV3 decoder.

VC1 Macroblock-level functions in Simple/Main Profiles

See also:
7.1.4, p91 and 8.1.1.7, p(1)04

static int vc1_coded_block_pred (MpegEncContext *s, int n, uint8_t **coded_block_ptr)

static void vc1_decode_ac_coeff (VC1Context *v, int *last, int *skip, int *value, int codingset)

Decode one AC coefficient.

static int vc1_decode_i_block (VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)

Decode intra block in intra frames - should be faster than decode_intra_block.

static int vc1_decode_i_block_adv (VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)

Decode intra block in intra frames - should be faster than decode_intra_block.

static int vc1_decode_intra_block (VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)

Decode intra block in inter frames - more generic version than vc1_decode_i_block.

static int vc1_decode_p_block (VC1Context *v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block, uint8_t *dst, int linesize, int skip_block, int *ttmb_out)

Decode P block.

Variables

static const uint16_t table_mb_intra [64][2]

static const uint16_t vlc_offs []

static const int size_table [6] = { 0, 2, 3, 4, 5, 8 }

static const int offset_table [6] = { 0, 1, 3, 7, 15, 31 }

static const AVProfile profiles []

AVCodec ff_vc1_decoder

VC-1 Block-level functions

See also:
7.1.4, p91 and 8.1.1.7, p(1)04

#define GET_MQUANT()

Get macroblock-level quantizer scale.

#define GET_MVDATA(_dmv_x, _dmv_y)

Get MV differentials.

static void vc1_pred_mv (VC1Context *v, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t *is_intra)

Predict and set motion vector.

static void vc1_interp_mc (VC1Context *v)

Motion compensation for direct or interpolated blocks in B-frames.

static av_always_inline int scale_mv (int value, int bfrac, int inv, int qs)

static void vc1_b_mc (VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)

Reconstruct motion vector for B-frame and do motion compensation.

static void vc1_pred_b_mv (VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)

static int vc1_i_pred_dc (MpegEncContext *s, int overlap, int pq, int n, int16_t **dc_val_ptr, int *dir_ptr)

Get predicted DC value for I-frames only prediction dir: left=0, top=1.

static int vc1_pred_dc (MpegEncContext *s, int overlap, int pq, int n, int a_avail, int c_avail, int16_t **dc_val_ptr, int *dir_ptr)

Get predicted DC value prediction dir: left=0, top=1.

Detailed Description

VC-1 and WMV3 decoder.

Definition in file vc1dec.c.

Define Documentation

#define AC_VLC_BITS 9

Definition at line 47 of file vc1dec.c.

#define DC_VLC_BITS 9

Definition at line 46 of file vc1dec.c.

#define GET_MQUANT ( )

Get macroblock-level quantizer scale.

Definition at line 786 of file vc1dec.c.

Referenced by vc1_decode_b_mb(), vc1_decode_i_blocks_adv(), and vc1_decode_p_mb().

#define GET_MVDATA	(	_dmv_x,
		_dmv_y		)

Get MV differentials.

See also:: MVDATA decoding from 8.3.5.2, p(1)20

Parameters:

	_dmv_x	Horizontal differential for decoded MV
	_dmv_y	Vertical differential for decoded MV

Definition at line 826 of file vc1dec.c.

Referenced by vc1_decode_b_mb(), and vc1_decode_p_mb().

#define inc_blk_idx ( idx )

Value:

do { \
        idx++; \
        if (idx >= v->n_allocated_blks) \
            idx = 0; \
    } while (0)

Referenced by vc1_put_signed_blocks_clamped().

#define MB_INTRA_VLC_BITS 9

Definition at line 45 of file vc1dec.c.

#define transpose ( x ) ((x>>3) | ((x&7)<<3))

Referenced by avfilter_register_all(), and vc1_decode_init().

Enumeration Type Documentation

enum Imode

Imode types.

Enumerator:

IMODE_RAW
IMODE_NORM2
IMODE_DIFF2
IMODE_NORM6
IMODE_DIFF6
IMODE_ROWSKIP
IMODE_COLSKIP
IMODE_RAW
IMODE_NORM2
IMODE_DIFF2
IMODE_NORM6
IMODE_DIFF6
IMODE_ROWSKIP
IMODE_COLSKIP

Definition at line 149 of file vc1dec.c.

Function Documentation

static float get_float_val ( GetBitContext * gb ) [inline, static]

Definition at line 3282 of file vc1dec.c.

Referenced by vc1_parse_sprites(), and vc1_sprite_parse_transform().

static int median4	(	int	a,
		int	b,
		int	c,
		int	d
	)			`[inline, static]`

Definition at line 627 of file vc1dec.c.

Referenced by vc1_mc_4mv_chroma().

static av_always_inline int scale_mv	(	int	value,
		int	bfrac,
		int	inv,
		int	qs
	)			`[static]`

Definition at line 1122 of file vc1dec.c.

static av_always_inline void vc1_apply_p_h_loop_filter	(	VC1Context *	v,
		int	block_num
	)			`[static]`

Definition at line 2382 of file vc1dec.c.

Referenced by vc1_apply_p_loop_filter().

static void vc1_apply_p_loop_filter ( VC1Context * v ) [static]

Definition at line 2442 of file vc1dec.c.

Referenced by vc1_decode_p_blocks().

static av_always_inline void vc1_apply_p_v_loop_filter	(	VC1Context *	v,
		int	block_num
	)			`[static]`

Definition at line 2318 of file vc1dec.c.

Referenced by vc1_apply_p_loop_filter().

static void vc1_b_mc	(	VC1Context *	v,
		int	dmv_x[2],
		int	dmv_y[2],
		int	direct,
		int	mode
	)			`[inline, static]`

Reconstruct motion vector for B-frame and do motion compensation.

Definition at line 1143 of file vc1dec.c.

Referenced by vc1_decode_b_mb().

static int vc1_coded_block_pred	(	MpegEncContext *	s,
		int	n,
		uint8_t **	coded_block_ptr
	)			`[inline, static]`

Definition at line 1520 of file vc1dec.c.

Referenced by vc1_decode_i_blocks(), and vc1_decode_i_blocks_adv().

static void vc1_decode_ac_coeff	(	VC1Context *	v,
		int *	last,
		int *	skip,
		int *	value,
		int	codingset
	)			`[static]`

Decode one AC coefficient.

Parameters:

	v	The VC1 context
	last	Last coefficient
	skip	How much zero coefficients to skip
	value	Decoded AC coefficient value
	codingset	set of VLC to decode data

See also:: 8.1.3.4

Definition at line 1555 of file vc1dec.c.

Referenced by vc1_decode_i_block(), vc1_decode_i_block_adv(), vc1_decode_intra_block(), and vc1_decode_p_block().

static void vc1_decode_b_blocks ( VC1Context * v ) [static]

Definition at line 3171 of file vc1dec.c.

Referenced by vc1_decode_blocks().

static void vc1_decode_b_mb ( VC1Context * v ) [static]

Decode one B-frame MB (in Main profile).

Definition at line 2703 of file vc1dec.c.

Referenced by vc1_decode_b_blocks().

static void vc1_decode_blocks ( VC1Context * v ) [static]

Definition at line 3245 of file vc1dec.c.

Referenced by vc1_decode_frame().

static av_cold int vc1_decode_end ( AVCodecContext * avctx ) [static]

Close a VC1/WMV3 decoder.

Warning:: Initial try at using MpegEncContext stuff

Definition at line 3803 of file vc1dec.c.

static int vc1_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			`[static]`

Decode a VC1/WMV3 frame.

Todo:: TODO: Handle VC-1 IDUs (Transport level?)

Definition at line 3573 of file vc1dec.c.

static int vc1_decode_i_block	(	VC1Context *	v,
		DCTELEM	block[64],
		int	n,
		int	coded,
		int	codingset
	)			`[static]`

Decode intra block in intra frames - should be faster than decode_intra_block.

Parameters:

	v	VC1Context
	block	block to decode
`[in]`	n	subblock index
	coded	are AC coeffs present or not
	codingset	set of VLC to decode data

Definition at line 1620 of file vc1dec.c.

Referenced by vc1_decode_i_blocks().

static int vc1_decode_i_block_adv	(	VC1Context *	v,
		DCTELEM	block[64],
		int	n,
		int	coded,
		int	codingset,
		int	mquant
	)			`[static]`

Decode intra block in intra frames - should be faster than decode_intra_block.

Parameters:

	v	VC1Context
	block	block to decode
`[in]`	n	subblock number
	coded	are AC coeffs present or not
	codingset	set of VLC to decode data
	mquant	quantizer value for this macroblock

Definition at line 1786 of file vc1dec.c.

Referenced by vc1_decode_i_blocks_adv().

static void vc1_decode_i_blocks ( VC1Context * v ) [static]

Decode blocks of I-frame.

Definition at line 2847 of file vc1dec.c.

Referenced by vc1_decode_blocks().

static void vc1_decode_i_blocks_adv ( VC1Context * v ) [static]

Decode blocks of I-frame for advanced profile.

Definition at line 2978 of file vc1dec.c.

Referenced by vc1_decode_blocks().

static av_cold int vc1_decode_init ( AVCodecContext * avctx ) [static]

Initialize a VC1/WMV3 decoder.

Todo:: TODO: Handle VC-1 IDUs (Transport level?)
TODO: Decypher remaining bits in extra_data

Definition at line 3396 of file vc1dec.c.

static int vc1_decode_intra_block	(	VC1Context *	v,
		DCTELEM	block[64],
		int	n,
		int	coded,
		int	mquant,
		int	codingset
	)			`[static]`

Decode intra block in inter frames - more generic version than vc1_decode_i_block.

Parameters:

	v	VC1Context
	block	block to decode
`[in]`	n	subblock index
	coded	are AC coeffs present or not
	mquant	block quantizer
	codingset	set of VLC to decode data

Definition at line 1981 of file vc1dec.c.

Referenced by vc1_decode_b_mb(), and vc1_decode_p_mb().

static int vc1_decode_p_block	(	VC1Context *	v,
		DCTELEM	block[64],
		int	n,
		int	mquant,
		int	ttmb,
		int	first_block,
		uint8_t *	dst,
		int	linesize,
		int	skip_block,
		int *	ttmb_out
	)			`[static]`

Decode P block.

Definition at line 2173 of file vc1dec.c.

Referenced by vc1_decode_b_mb(), and vc1_decode_p_mb().

static void vc1_decode_p_blocks ( VC1Context * v ) [static]

Definition at line 3103 of file vc1dec.c.

Referenced by vc1_decode_blocks().

static int vc1_decode_p_mb ( VC1Context * v ) [static]

Decode one P-frame MB (in Simple/Main profile).

Definition at line 2469 of file vc1dec.c.

Referenced by vc1_decode_p_blocks().

static void vc1_decode_skip_blocks ( VC1Context * v ) [static]

Definition at line 3226 of file vc1dec.c.

Referenced by vc1_decode_blocks().

static int vc1_i_pred_dc	(	MpegEncContext *	s,
		int	overlap,
		int	pq,
		int	n,
		int16_t **	dc_val_ptr,
		int *	dir_ptr
	)			`[inline, static]`

Get predicted DC value for I-frames only prediction dir: left=0, top=1.

Parameters:

	s	MpegEncContext
	overlap	flag indicating that overlap filtering is used
	pq	integer part of picture quantizer
`[in]`	n	block index in the current MB
	dc_val_ptr	Pointer to DC predictor
	dir_ptr	Prediction direction for use in AC prediction

Definition at line 1385 of file vc1dec.c.

Referenced by vc1_decode_i_block().

static int vc1_init_common ( VC1Context * v ) [static]

Init VC-1 specific tables and VC1Context members.

Parameters:

v

The VC1Context to initialize

Returns:: Status

Definition at line 62 of file vc1dec.c.

Referenced by vc1_decode_init().

static void vc1_interp_mc ( VC1Context * v ) [static]

Motion compensation for direct or interpolated blocks in B-frames.

Definition at line 1007 of file vc1dec.c.

Referenced by vc1_b_mc().

static void vc1_loop_filter_iblk	(	VC1Context *	v,
		int	pq
	)			`[static]`

Definition at line 229 of file vc1dec.c.

Referenced by vc1_decode_b_blocks(), and vc1_decode_i_blocks().

static void vc1_loop_filter_iblk_delayed	(	VC1Context *	v,
		int	pq
	)			`[static]`

Definition at line 256 of file vc1dec.c.

Referenced by vc1_decode_i_blocks_adv().

static void vc1_mc_1mv	(	VC1Context *	v,
		int	dir
	)			`[static]`

Do motion compensation over 1 macroblock Mostly adapted hpel_motion and qpel_motion from mpegvideo.c.

Definition at line 404 of file vc1dec.c.

Referenced by vc1_b_mc(), and vc1_decode_p_mb().

static void vc1_mc_4mv_chroma ( VC1Context * v ) [static]

Do motion compensation for 4-MV macroblock - both chroma blocks.

Definition at line 641 of file vc1dec.c.

Referenced by vc1_decode_p_mb().

static void vc1_mc_4mv_luma	(	VC1Context *	v,
		int	n
	)			`[static]`

Do motion compensation for 4-MV macroblock - luminance block.

Definition at line 555 of file vc1dec.c.

Referenced by vc1_decode_p_mb().

static void vc1_parse_sprites	(	VC1Context *	v,
		GetBitContext *	gb
	)			`[static]`

Definition at line 3322 of file vc1dec.c.

Referenced by vc1_decode_frame().

static void vc1_pred_b_mv	(	VC1Context *	v,
		int	dmv_x[2],
		int	dmv_y[2],
		int	direct,
		int	mvtype
	)			`[inline, static]`

Definition at line 1167 of file vc1dec.c.

Referenced by vc1_decode_b_mb().

static int vc1_pred_dc	(	MpegEncContext *	s,
		int	overlap,
		int	pq,
		int	n,
		int	a_avail,
		int	c_avail,
		int16_t **	dc_val_ptr,
		int *	dir_ptr
	)			`[inline, static]`

Get predicted DC value prediction dir: left=0, top=1.

Parameters:

	s	MpegEncContext
	overlap	flag indicating that overlap filtering is used
	pq	integer part of picture quantizer
`[in]`	n	block index in the current MB
	a_avail	flag indicating top block availability
	c_avail	flag indicating left block availability
	dc_val_ptr	Pointer to DC predictor
	dir_ptr	Prediction direction for use in AC prediction

Definition at line 1449 of file vc1dec.c.

Referenced by vc1_decode_i_block_adv(), and vc1_decode_intra_block().

static void vc1_pred_mv	(	VC1Context *	v,
		int	n,
		int	dmv_x,
		int	dmv_y,
		int	mv1,
		int	r_x,
		int	r_y,
		uint8_t *	is_intra
	)			`[inline, static]`

Predict and set motion vector.

Definition at line 871 of file vc1dec.c.

Referenced by vc1_decode_p_mb().

static void vc1_put_signed_blocks_clamped ( VC1Context * v ) [static]

Definition at line 163 of file vc1dec.c.

Referenced by vc1_decode_i_blocks_adv().

static void vc1_smooth_overlap_filter_iblk ( VC1Context * v ) [static]

Definition at line 324 of file vc1dec.c.

Referenced by vc1_decode_i_blocks_adv().

static void vc1_sprite_parse_transform	(	VC1Context *	v,
		GetBitContext *	gb,
		float	c[7]
	)			`[static]`

Definition at line 3287 of file vc1dec.c.

Referenced by vc1_parse_sprites().

Variable Documentation

AVCodec ff_vc1_decoder

Initial value:

 {
    "vc1",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_VC1,
    sizeof(VC1Context),
    vc1_decode_init,
    NULL,
    vc1_decode_end,
    vc1_decode_frame,
    CODEC_CAP_DR1 | CODEC_CAP_DELAY,
    NULL,
    .flush          = ff_mpeg_flush,
    .long_name = NULL_IF_CONFIG_SMALL("SMPTE VC-1"),
    .pix_fmts = ff_hwaccel_pixfmt_list_420,
    .profiles = NULL_IF_CONFIG_SMALL(profiles)
}

Definition at line 3832 of file vc1dec.c.

const int offset_table[6] = { 0, 1, 3, 7, 15, 31 } [static]

Definition at line 2316 of file vc1dec.c.

Referenced by seq_parse_frame_data().

const AVProfile profiles[] [static]

Initial value:

 {
    { FF_PROFILE_VC1_SIMPLE,   "Simple"   },
    { FF_PROFILE_VC1_MAIN,     "Main"     },
    { FF_PROFILE_VC1_COMPLEX,  "Complex"  },
    { FF_PROFILE_VC1_ADVANCED, "Advanced" },
    { FF_PROFILE_UNKNOWN },
}

Definition at line 3824 of file vc1dec.c.

const int size_table[6] = { 0, 2, 3, 4, 5, 8 } [static]

Definition at line 2315 of file vc1dec.c.

const uint16_t table_mb_intra[64][2] [static]

Definition at line 48 of file vc1dec.c.

const uint16_t vlc_offs[] [static]

Initial value:

 {
       0,   520,   552,   616,  1128,  1160, 1224, 1740, 1772, 1836, 1900, 2436,
    2986,  3050,  3610,  4154,  4218,  4746, 5326, 5390, 5902, 6554, 7658, 8620,
    9262, 10202, 10756, 11310, 12228, 15078
}

Definition at line 51 of file vc1dec.c.

Referenced by vc1_init_common().


Defines
#define	MB_INTRA_VLC_BITS 9
#define	DC_VLC_BITS 9
#define	AC_VLC_BITS 9
#define	inc_blk_idx(idx)
#define	transpose(x) ((x>>3) \| ((x&7)<<3))
Enumerations
VC-1 Bitplane decoding
See also: 8.7, p56
enum	Imode { IMODE_RAW, IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6, IMODE_DIFF6, IMODE_ROWSKIP, IMODE_COLSKIP, IMODE_RAW, IMODE_NORM2, IMODE_DIFF2, IMODE_NORM6, IMODE_DIFF6, IMODE_ROWSKIP, IMODE_COLSKIP }
	Imode types. More...
Functions
static int	vc1_init_common (VC1Context *v)
	Init VC-1 specific tables and VC1Context members.
static void	vc1_put_signed_blocks_clamped (VC1Context *v)
static void	vc1_loop_filter_iblk (VC1Context *v, int pq)
static void	vc1_loop_filter_iblk_delayed (VC1Context *v, int pq)
static void	vc1_smooth_overlap_filter_iblk (VC1Context *v)
static void	vc1_mc_1mv (VC1Context *v, int dir)
	Do motion compensation over 1 macroblock Mostly adapted hpel_motion and qpel_motion from mpegvideo.c.
static void	vc1_mc_4mv_luma (VC1Context *v, int n)
	Do motion compensation for 4-MV macroblock - luminance block.
static int	median4 (int a, int b, int c, int d)
static void	vc1_mc_4mv_chroma (VC1Context *v)
	Do motion compensation for 4-MV macroblock - both chroma blocks.
static av_always_inline void	vc1_apply_p_v_loop_filter (VC1Context *v, int block_num)
static av_always_inline void	vc1_apply_p_h_loop_filter (VC1Context *v, int block_num)
static void	vc1_apply_p_loop_filter (VC1Context *v)
static int	vc1_decode_p_mb (VC1Context *v)
	Decode one P-frame MB (in Simple/Main profile).
static void	vc1_decode_b_mb (VC1Context *v)
	Decode one B-frame MB (in Main profile).
static void	vc1_decode_i_blocks (VC1Context *v)
	Decode blocks of I-frame.
static void	vc1_decode_i_blocks_adv (VC1Context *v)
	Decode blocks of I-frame for advanced profile.
static void	vc1_decode_p_blocks (VC1Context *v)
static void	vc1_decode_b_blocks (VC1Context *v)
static void	vc1_decode_skip_blocks (VC1Context *v)
static void	vc1_decode_blocks (VC1Context *v)
static float	get_float_val (GetBitContext *gb)
static void	vc1_sprite_parse_transform (VC1Context v, GetBitContext gb, float c[7])
static void	vc1_parse_sprites (VC1Context v, GetBitContext gb)
static av_cold int	vc1_decode_init (AVCodecContext *avctx)
	Initialize a VC1/WMV3 decoder.
static int	vc1_decode_frame (AVCodecContext avctx, void data, int data_size, AVPacket avpkt)
	Decode a VC1/WMV3 frame.
static av_cold int	vc1_decode_end (AVCodecContext *avctx)
	Close a VC1/WMV3 decoder.
VC1 Macroblock-level functions in Simple/Main Profiles
See also: 7.1.4, p91 and 8.1.1.7, p(1)04
static int	vc1_coded_block_pred (MpegEncContext s, int n, uint8_t *coded_block_ptr)
static void	vc1_decode_ac_coeff (VC1Context v, int last, int skip, int value, int codingset)
	Decode one AC coefficient.
static int	vc1_decode_i_block (VC1Context *v, DCTELEM block[64], int n, int coded, int codingset)
	Decode intra block in intra frames - should be faster than decode_intra_block.
static int	vc1_decode_i_block_adv (VC1Context *v, DCTELEM block[64], int n, int coded, int codingset, int mquant)
	Decode intra block in intra frames - should be faster than decode_intra_block.
static int	vc1_decode_intra_block (VC1Context *v, DCTELEM block[64], int n, int coded, int mquant, int codingset)
	Decode intra block in inter frames - more generic version than vc1_decode_i_block.
static int	vc1_decode_p_block (VC1Context v, DCTELEM block[64], int n, int mquant, int ttmb, int first_block, uint8_t dst, int linesize, int skip_block, int *ttmb_out)
	Decode P block.
Variables
static const uint16_t	table_mb_intra [64][2]
static const uint16_t	vlc_offs []
static const int	size_table [6] = { 0, 2, 3, 4, 5, 8 }
static const int	offset_table [6] = { 0, 1, 3, 7, 15, 31 }
static const AVProfile	profiles []
AVCodec	ff_vc1_decoder
VC-1 Block-level functions
See also: 7.1.4, p91 and 8.1.1.7, p(1)04
#define	GET_MQUANT()
	Get macroblock-level quantizer scale.
#define	GET_MVDATA(_dmv_x, _dmv_y)
	Get MV differentials.
static void	vc1_pred_mv (VC1Context v, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t is_intra)
	Predict and set motion vector.
static void	vc1_interp_mc (VC1Context *v)
	Motion compensation for direct or interpolated blocks in B-frames.
static av_always_inline int	scale_mv (int value, int bfrac, int inv, int qs)
static void	vc1_b_mc (VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mode)
	Reconstruct motion vector for B-frame and do motion compensation.
static void	vc1_pred_b_mv (VC1Context *v, int dmv_x[2], int dmv_y[2], int direct, int mvtype)
static int	vc1_i_pred_dc (MpegEncContext s, int overlap, int pq, int n, int16_t dc_val_ptr, int dir_ptr)
	Get predicted DC value for I-frames only prediction dir: left=0, top=1.
static int	vc1_pred_dc (MpegEncContext s, int overlap, int pq, int n, int a_avail, int c_avail, int16_t dc_val_ptr, int dir_ptr)
	Get predicted DC value prediction dir: left=0, top=1.