libavcodec/vc1.c File Reference

VC-1 and WMV3 decoder common code. More...

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

Go to the source code of this file.

Defines
#define	INIT_LUT(lumscale, lumshift, luty, lutuv)
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 void	decode_rowskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
	Decode rows by checking if they are skipped.
static void	decode_colskip (uint8_t *plane, int width, int height, int stride, GetBitContext *gb)
	Decode columns by checking if they are skipped.
static int	bitplane_decoding (uint8_t *data, int *raw_flag, VC1Context *v)
	Decode a bitplane's bits.
static int	vop_dquant_decoding (VC1Context *v)
	VOP Dquant decoding.
static int	decode_sequence_header_adv (VC1Context *v, GetBitContext *gb)
int	vc1_decode_sequence_header (AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
	Decode Simple/Main Profiles sequence header.
int	vc1_decode_entry_point (AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
int	vc1_parse_frame_header (VC1Context *v, GetBitContext *gb)
int	vc1_parse_frame_header_adv (VC1Context *v, GetBitContext *gb)

---

Detailed Description

VC-1 and WMV3 decoder common code.

Definition in file vc1.c.

---

Define Documentation

#define INIT_LUT	(	lumscale,
		lumshift,
		luty,
		lutuv		)

Value:

if (!lumscale) {                                \
        scale = -64;                                \
        shift = (255 - lumshift * 2) << 6;          \
        if (lumshift > 31)                          \
            shift += 128 << 6;                      \
    } else {                                        \
        scale = lumscale + 32;                      \
        if (lumshift > 31)                          \
            shift = (lumshift - 64) << 6;           \
        else                                        \
            shift = lumshift << 6;                  \
    }                                               \
    for (i = 0; i < 256; i++) {                     \
        luty[i]  = av_clip_uint8((scale * i + shift + 32) >> 6);           \
        lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);  \
    }

Definition at line 802 of file vc1.c.

Referenced by vc1_parse_frame_header_adv().

---

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 54 of file vc1.c.

---

Function Documentation

static int bitplane_decoding	(	uint8_t *	data,
		int *	raw_flag,
		VC1Context *	v
	)			[static]

Decode a bitplane's bits.

Parameters:

	data	bitplane where to store the decode bits
[out]	raw_flag	pointer to the flag indicating that this bitplane is not coded explicitly
	v	VC-1 context for bit reading and logging

Returns:

Status

Todo:

FIXME: Optimize

Definition at line 116 of file vc1.c.

Referenced by vc1_parse_frame_header(), and vc1_parse_frame_header_adv().

static void decode_colskip	(	uint8_t *	plane,
		int	width,
		int	height,
		int	stride,
		GetBitContext *	gb
	)			[static]

Decode columns by checking if they are skipped.

Parameters:

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer

Todo:

FIXME: Optimize

Definition at line 93 of file vc1.c.

Referenced by bitplane_decoding().

static void decode_rowskip	(	uint8_t *	plane,
		int	width,
		int	height,
		int	stride,
		GetBitContext *	gb
	)			[static]

Decode rows by checking if they are skipped.

Parameters:

	plane	Buffer to store decoded bits
[in]	width	Width of this buffer
[in]	height	Height of this buffer
[in]	stride	of this buffer

Definition at line 71 of file vc1.c.

Referenced by bitplane_decoding().

static int decode_sequence_header_adv	(	VC1Context *	v,
		GetBitContext *	gb
	)			[static]

Definition at line 419 of file vc1.c.

Referenced by vc1_decode_sequence_header().

int vc1_decode_entry_point	(	AVCodecContext *	avctx,
		VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 528 of file vc1.c.

Referenced by vc1_decode_frame(), vc1_decode_init(), and vc1_extract_headers().

int vc1_decode_sequence_header	(	AVCodecContext *	avctx,
		VC1Context *	v,
		GetBitContext *	gb
	)

Decode Simple/Main Profiles sequence header.

See also:

Figure 7-8, p16-17

Parameters:

	avctx	Codec context
	gb	GetBit context initialized from Codec context extra_data

Returns:

Status

Definition at line 294 of file vc1.c.

Referenced by vc1_decode_init(), and vc1_extract_headers().

int vc1_parse_frame_header	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 577 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_headers().

int vc1_parse_frame_header_adv	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 820 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_headers().

static int vop_dquant_decoding

(

VC1Context *

v

)

[static]

VOP Dquant decoding.

Parameters:

v

VC-1 Context

Definition at line 245 of file vc1.c.

Referenced by vc1_parse_frame_header(), and vc1_parse_frame_header_adv().