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

#include "internal.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>

Macros
#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	ff_vc1_decode_sequence_header (AVCodecContext avctx, VC1Context v, GetBitContext *gb)
	Decode Simple/Main Profiles sequence header.

int	ff_vc1_decode_entry_point (AVCodecContext avctx, VC1Context v, GetBitContext *gb)

int	ff_vc1_parse_frame_header (VC1Context v, GetBitContext gb)

int	ff_vc1_parse_frame_header_adv (VC1Context v, GetBitContext gb)

int	ff_vc1_init_common (VC1Context *v)
	Init VC-1 specific tables and VC1Context members.

Variables
static const uint32_t	vc1_ac_tables [AC_MODES][186][2]

static const uint16_t	vlc_offs []

Detailed Description

VC-1 and WMV3 decoder common code.

Definition in file vc1.c.

Macro Definition 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 812 of file vc1.c.

Referenced by ff_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 53 of file vc1.c.

Function Documentation

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 70 of file vc1.c.

Referenced by bitplane_decoding().

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 92 of file vc1.c.

Referenced by bitplane_decoding().

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 115 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

static int vop_dquant_decoding ( VC1Context * v )

static

VOP Dquant decoding.

Parameters

v	VC-1 Context

Definition at line 244 of file vc1.c.

Referenced by ff_vc1_parse_frame_header(), and ff_vc1_parse_frame_header_adv().

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

static

Definition at line 416 of file vc1.c.

Referenced by ff_vc1_decode_sequence_header().

int ff_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 293 of file vc1.c.

Referenced by vc1_decode_init(), and vc1_extract_headers().

int ff_vc1_decode_entry_point	(	AVCodecContext *	avctx,
		VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 524 of file vc1.c.

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

int ff_vc1_parse_frame_header	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 579 of file vc1.c.

Referenced by decode_wmv9(), vc1_decode_frame(), and vc1_extract_headers().

int ff_vc1_parse_frame_header_adv	(	VC1Context *	v,
		GetBitContext *	gb
	)

Definition at line 830 of file vc1.c.

Referenced by vc1_decode_frame(), and vc1_extract_headers().

int ff_vc1_init_common ( VC1Context * v )

Init VC-1 specific tables and VC1Context members.

Parameters

v	The VC1Context to initialize

Returns: Status

Definition at line 1542 of file vc1.c.

Referenced by vc1_decode_init(), vc1_parse_init(), and wmv9_init().

Variable Documentation

const uint32_t vc1_ac_tables[AC_MODES][186][2]

static

Definition at line 1306 of file vc1.c.

Referenced by ff_vc1_init_common().

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,  8342,
     9304,  9988, 10630, 11234, 12174, 13006, 13560, 14232, 14786, 15432, 16350, 17522,
    20372, 21818, 22330, 22394, 23166, 23678, 23742, 24820, 25332, 25396, 26460, 26980,
    27048, 27592, 27600, 27608, 27616, 27624, 28224, 28258, 28290, 28802, 28834, 28866,
    29378, 29412, 29444, 29960, 29994, 30026, 30538, 30572, 30604, 31120, 31154, 31186,
    31714, 31746, 31778, 32306, 32340, 32372
}

Definition at line 1527 of file vc1.c.

Referenced by ff_vc1_init_common().

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation